WIP

base/src/actions.rs

@@ -22,7 +22,7 @@ impl Model {
             .cell(row, column)
             .and_then(|c| c.get_formula())
         {
-            let node = &self.parsed_formulas[sheet as usize][f as usize].clone();
+            let node = &self.parsed_formulas[sheet as usize][f as usize].0.clone();
             let cell_reference = CellReferenceRC {
                 sheet: self.workbook.worksheets[sheet as usize].get_name(),
                 row,

base/src/arithmetic.rs

@@ -77,8 +77,6 @@ impl Model {
                         match to_f64(&node) {
                             Ok(f2) => match op(f1, f2) {
                                 Ok(x) => data_row.push(ArrayNode::Number(x)),
-                                Err(Error::DIV) => data_row.push(ArrayNode::Error(Error::DIV)),
-                                Err(Error::VALUE) => data_row.push(ArrayNode::Error(Error::VALUE)),
                                 Err(e) => data_row.push(ArrayNode::Error(e)),
                             },
                             Err(err) => data_row.push(ArrayNode::Error(err)),
@@ -100,8 +98,6 @@ impl Model {
                         match to_f64(&node) {
                             Ok(f1) => match op(f1, f2) {
                                 Ok(x) => data_row.push(ArrayNode::Number(x)),
-                                Err(Error::DIV) => data_row.push(ArrayNode::Error(Error::DIV)),
-                                Err(Error::VALUE) => data_row.push(ArrayNode::Error(Error::VALUE)),
                                 Err(e) => data_row.push(ArrayNode::Error(e)),
                             },
                             Err(err) => data_row.push(ArrayNode::Error(err)),
@@ -137,10 +133,6 @@ impl Model {
                             (Some(v1), Some(v2)) => match (to_f64(v1), to_f64(v2)) {
                                 (Ok(f1), Ok(f2)) => match op(f1, f2) {
                                     Ok(x) => data_row.push(ArrayNode::Number(x)),
-                                    Err(Error::DIV) => data_row.push(ArrayNode::Error(Error::DIV)),
-                                    Err(Error::VALUE) => {
-                                        data_row.push(ArrayNode::Error(Error::VALUE))
-                                    }
                                     Err(e) => data_row.push(ArrayNode::Error(e)),
                                 },
                                 (Err(e), _) | (_, Err(e)) => data_row.push(ArrayNode::Error(e)),

base/src/cell.rs

@@ -64,12 +64,50 @@ impl Cell {
     /// Returns the formula of a cell if any.
     pub fn get_formula(&self) -> Option<i32> {
         match self {
-            Cell::CellFormula { f, .. } => Some(*f),
-            Cell::CellFormulaBoolean { f, .. } => Some(*f),
-            Cell::CellFormulaNumber { f, .. } => Some(*f),
-            Cell::CellFormulaString { f, .. } => Some(*f),
-            Cell::CellFormulaError { f, .. } => Some(*f),
-            _ => None,
+            Cell::CellFormula { f, .. }
+            | Cell::CellFormulaBoolean { f, .. }
+            | Cell::CellFormulaNumber { f, .. }
+            | Cell::CellFormulaString { f, .. }
+            | Cell::CellFormulaError { f, .. }
+            | Cell::DynamicCellFormula { f, .. }
+            | Cell::DynamicCellFormulaBoolean { f, .. }
+            | Cell::DynamicCellFormulaNumber { f, .. }
+            | Cell::DynamicCellFormulaString { f, .. }
+            | Cell::DynamicCellFormulaError { f, .. } => Some(*f),
+            Cell::EmptyCell { .. }
+            | Cell::BooleanCell { .. }
+            | Cell::NumberCell { .. }
+            | Cell::ErrorCell { .. }
+            | Cell::SharedString { .. }
+            | Cell::SpillNumberCell { .. }
+            | Cell::SpillBooleanCell { .. }
+            | Cell::SpillErrorCell { .. }
+            | Cell::SpillStringCell { .. } => None,
+        }
+    }
+
+    /// Returns the dynamic range of a cell if any.
+    pub fn get_dynamic_range(&self) -> Option<(i32, i32)> {
+        match self {
+            Cell::DynamicCellFormula { r, .. } => Some(*r),
+            Cell::DynamicCellFormulaBoolean { r, .. } => Some(*r),
+            Cell::DynamicCellFormulaNumber { r, .. } => Some(*r),
+            Cell::DynamicCellFormulaString { r, .. } => Some(*r),
+            Cell::DynamicCellFormulaError { r, .. } => Some(*r),
+            Cell::EmptyCell { .. }
+            | Cell::BooleanCell { .. }
+            | Cell::NumberCell { .. }
+            | Cell::ErrorCell { .. }
+            | Cell::SharedString { .. }
+            | Cell::CellFormula { .. }
+            | Cell::CellFormulaBoolean { .. }
+            | Cell::CellFormulaNumber { .. }
+            | Cell::CellFormulaString { .. }
+            | Cell::CellFormulaError { .. }
+            | Cell::SpillNumberCell { .. }
+            | Cell::SpillBooleanCell { .. }
+            | Cell::SpillErrorCell { .. }
+            | Cell::SpillStringCell { .. } => None,
         }
     }
 
@@ -89,6 +127,15 @@ impl Cell {
             Cell::CellFormulaNumber { s, .. } => *s = style,
             Cell::CellFormulaString { s, .. } => *s = style,
             Cell::CellFormulaError { s, .. } => *s = style,
+            Cell::SpillBooleanCell { s, .. } => *s = style,
+            Cell::SpillNumberCell { s, .. } => *s = style,
+            Cell::SpillStringCell { s, .. } => *s = style,
+            Cell::SpillErrorCell { s, .. } => *s = style,
+            Cell::DynamicCellFormula { s, .. } => *s = style,
+            Cell::DynamicCellFormulaBoolean { s, .. } => *s = style,
+            Cell::DynamicCellFormulaNumber { s, .. } => *s = style,
+            Cell::DynamicCellFormulaString { s, .. } => *s = style,
+            Cell::DynamicCellFormulaError { s, .. } => *s = style,
         };
     }
 
@@ -104,6 +151,15 @@ impl Cell {
             Cell::CellFormulaNumber { s, .. } => *s,
             Cell::CellFormulaString { s, .. } => *s,
             Cell::CellFormulaError { s, .. } => *s,
+            Cell::SpillBooleanCell { s, .. } => *s,
+            Cell::SpillNumberCell { s, .. } => *s,
+            Cell::SpillStringCell { s, .. } => *s,
+            Cell::SpillErrorCell { s, .. } => *s,
+            Cell::DynamicCellFormula { s, .. } => *s,
+            Cell::DynamicCellFormulaBoolean { s, .. } => *s,
+            Cell::DynamicCellFormulaNumber { s, .. } => *s,
+            Cell::DynamicCellFormulaString { s, .. } => *s,
+            Cell::DynamicCellFormulaError { s, .. } => *s,
         }
     }
 
@@ -119,6 +175,15 @@ impl Cell {
             Cell::CellFormulaNumber { .. } => CellType::Number,
             Cell::CellFormulaString { .. } => CellType::Text,
             Cell::CellFormulaError { .. } => CellType::ErrorValue,
+            Cell::SpillBooleanCell { .. } => CellType::LogicalValue,
+            Cell::SpillNumberCell { .. } => CellType::Number,
+            Cell::SpillStringCell { .. } => CellType::Text,
+            Cell::SpillErrorCell { .. } => CellType::ErrorValue,
+            Cell::DynamicCellFormula { .. } => CellType::Number,
+            Cell::DynamicCellFormulaBoolean { .. } => CellType::LogicalValue,
+            Cell::DynamicCellFormulaNumber { .. } => CellType::Number,
+            Cell::DynamicCellFormulaString { .. } => CellType::Text,
+            Cell::DynamicCellFormulaError { .. } => CellType::ErrorValue,
         }
     }
 
@@ -136,7 +201,7 @@ impl Cell {
             Cell::EmptyCell { .. } => CellValue::None,
             Cell::BooleanCell { v, s: _ } => CellValue::Boolean(*v),
             Cell::NumberCell { v, s: _ } => CellValue::Number(*v),
-            Cell::ErrorCell { ei, .. } => {
+            Cell::ErrorCell { ei, .. } | Cell::SpillErrorCell { ei, .. } => {
                 let v = ei.to_localized_error_string(language);
                 CellValue::String(v)
             }
@@ -148,14 +213,25 @@ impl Cell {
                 };
                 CellValue::String(v)
             }
-            Cell::CellFormula { .. } => CellValue::String("#ERROR!".to_string()),
-            Cell::CellFormulaBoolean { v, .. } => CellValue::Boolean(*v),
-            Cell::CellFormulaNumber { v, .. } => CellValue::Number(*v),
-            Cell::CellFormulaString { v, .. } => CellValue::String(v.clone()),
-            Cell::CellFormulaError { ei, .. } => {
+            Cell::DynamicCellFormula { .. } | Cell::CellFormula { .. } => {
+                CellValue::String("#ERROR!".to_string())
+            }
+            Cell::DynamicCellFormulaBoolean { v, .. } | Cell::CellFormulaBoolean { v, .. } => {
+                CellValue::Boolean(*v)
+            }
+            Cell::DynamicCellFormulaNumber { v, .. } | Cell::CellFormulaNumber { v, .. } => {
+                CellValue::Number(*v)
+            }
+            Cell::DynamicCellFormulaString { v, .. } | Cell::CellFormulaString { v, .. } => {
+                CellValue::String(v.clone())
+            }
+            Cell::DynamicCellFormulaError { ei, .. } | Cell::CellFormulaError { ei, .. } => {
                 let v = ei.to_localized_error_string(language);
                 CellValue::String(v)
             }
+            Cell::SpillBooleanCell { v, .. } => CellValue::Boolean(*v),
+            Cell::SpillNumberCell { v, .. } => CellValue::Number(*v),
+            Cell::SpillStringCell { v, .. } => CellValue::String(v.clone()),
         }
     }
 

base/src/expressions/parser/static_analysis.rs

@@ -182,7 +182,7 @@ pub fn add_implicit_intersection(node: &mut Node, add: bool) {
     };
 }
 
-pub(crate) enum StaticResult {
+pub enum StaticResult {
     Scalar,
     Array(i32, i32),
     Range(i32, i32),
@@ -218,7 +218,7 @@ fn static_analysis_op_nodes(left: &Node, right: &Node) -> StaticResult {
 //  * Array(a, b) if we know it will be an a x b array.
 //  * Range(a, b) if we know it will be a a x b range.
 //  * Unknown if we cannot guaranty either
-fn run_static_analysis_on_node(node: &Node) -> StaticResult {
+pub(crate) fn run_static_analysis_on_node(node: &Node) -> StaticResult {
     match node {
         Node::BooleanKind(_)
         | Node::NumberKind(_)

base/src/functions/subtotal.rs

@@ -96,7 +96,7 @@ impl Model {
 
         match cell.get_formula() {
             Some(f) => {
-                let node = &self.parsed_formulas[sheet_index as usize][f as usize];
+                let node = &self.parsed_formulas[sheet_index as usize][f as usize].0;
                 matches!(
                     node,
                     Node::FunctionKind {

base/src/model.rs

@@ -11,8 +11,9 @@ use crate::{
         lexer::LexerMode,
         parser::{
             move_formula::{move_formula, MoveContext},
+            static_analysis::{run_static_analysis_on_node, StaticResult},
             stringify::{rename_defined_name_in_node, to_rc_format, to_string},
-            Node, Parser,
+            ArrayNode, Node, Parser,
         },
         token::{get_error_by_name, Error, OpCompare, OpProduct, OpSum, OpUnary},
         types::*,
@@ -99,7 +100,7 @@ pub struct Model {
     /// A Rust internal representation of an Excel workbook
     pub workbook: Workbook,
     /// A list of parsed formulas
-    pub parsed_formulas: Vec<Vec<Node>>,
+    pub parsed_formulas: Vec<Vec<(Node, StaticResult)>>,
     /// A list of parsed defined names
     pub(crate) parsed_defined_names: HashMap<(Option<u32>, String), ParsedDefinedName>,
     /// An optimization to lookup strings faster
@@ -522,14 +523,195 @@ impl Model {
         }
         Ok(format!("{}!{}{}", sheet.name, column, cell_reference.row))
     }
+
+    /// Sets sheet, target_row, target_column, (width, height), &v
+    #[allow(clippy::too_many_arguments)]
+    fn set_spill_cell_with_formula_value(
+        &mut self,
+        sheet: u32,
+        row: i32,
+        column: i32,
+        r: (i32, i32),
+        v: &CalcResult,
+        s: i32,
+        f: i32,
+    ) -> Result<(), String> {
+        let new_cell = match v {
+            CalcResult::EmptyCell => Cell::DynamicCellFormulaNumber {
+                f,
+                v: 0.0,
+                s,
+                r,
+                a: false,
+            },
+            CalcResult::String(v) => Cell::DynamicCellFormulaString {
+                f,
+                v: v.clone(),
+                s,
+                r,
+                a: false,
+            },
+            CalcResult::Number(v) => Cell::DynamicCellFormulaNumber {
+                v: *v,
+                s,
+                r,
+                f,
+                a: false,
+            },
+            CalcResult::Boolean(b) => Cell::DynamicCellFormulaBoolean {
+                v: *b,
+                s,
+                r,
+                f,
+                a: false,
+            },
+            CalcResult::Error { error, .. } => Cell::DynamicCellFormulaError {
+                ei: error.clone(),
+                s,
+                r,
+                f,
+                a: false,
+                o: "".to_string(),
+                m: "".to_string(),
+            },
+
+            // These cannot happen
+            // FIXME: Maybe the type of get_cell_value should be different
+            CalcResult::Range { .. } | CalcResult::EmptyArg | CalcResult::Array(_) => {
+                Cell::DynamicCellFormulaError {
+                    ei: Error::ERROR,
+                    s,
+                    r,
+                    f,
+                    a: false,
+                    o: "".to_string(),
+                    m: "".to_string(),
+                }
+            }
+        };
+        let sheet_data = &mut self.workbook.worksheet_mut(sheet)?.sheet_data;
+
+        match sheet_data.get_mut(&row) {
+            Some(column_data) => match column_data.get(&column) {
+                Some(_cell) => {
+                    column_data.insert(column, new_cell);
+                }
+                None => {
+                    column_data.insert(column, new_cell);
+                }
+            },
+            None => {
+                let mut column_data = HashMap::new();
+                column_data.insert(column, new_cell);
+                sheet_data.insert(row, column_data);
+            }
+        }
+        Ok(())
+    }
+
+    /// Sets a cell with a "spill" value
+    fn set_spill_cell_with_value(
+        &mut self,
+        sheet: u32,
+        row: i32,
+        column: i32,
+        m: (i32, i32),
+        v: &CalcResult,
+    ) -> Result<(), String> {
+        let style_index = self.get_cell_style_index(sheet, row, column)?;
+        let new_style_index = if self.workbook.styles.style_is_quote_prefix(style_index) {
+            self.workbook
+                .styles
+                .get_style_without_quote_prefix(style_index)?
+        } else {
+            style_index
+        };
+        let new_cell = match v {
+            CalcResult::EmptyCell => Cell::SpillNumberCell {
+                v: 0.0,
+                s: style_index,
+                m,
+            },
+            CalcResult::String(s) => Cell::SpillStringCell {
+                v: s.clone(),
+                s: new_style_index,
+                m,
+            },
+            CalcResult::Number(f) => Cell::SpillNumberCell {
+                v: *f,
+                s: new_style_index,
+                m,
+            },
+            CalcResult::Boolean(b) => Cell::SpillBooleanCell {
+                v: *b,
+                s: new_style_index,
+                m,
+            },
+            CalcResult::Error { error, .. } => Cell::SpillErrorCell {
+                ei: error.clone(),
+                s: style_index,
+                m,
+            },
+
+            // These cannot happen
+            // FIXME: Maybe the type of get_cell_value should be different
+            CalcResult::Range { .. } | CalcResult::EmptyArg | CalcResult::Array(_) => {
+                Cell::SpillErrorCell {
+                    ei: Error::ERROR,
+                    s: style_index,
+                    m,
+                }
+            }
+        };
+        let sheet_data = &mut self.workbook.worksheet_mut(sheet)?.sheet_data;
+
+        match sheet_data.get_mut(&row) {
+            Some(column_data) => match column_data.get(&column) {
+                Some(_cell) => {
+                    column_data.insert(column, new_cell);
+                }
+                None => {
+                    column_data.insert(column, new_cell);
+                }
+            },
+            None => {
+                let mut column_data = HashMap::new();
+                column_data.insert(column, new_cell);
+                sheet_data.insert(row, column_data);
+            }
+        }
+        Ok(())
+    }
+
     /// Sets `result` in the cell given by `sheet` sheet index, row and column
     /// Note that will panic if the cell does not exist
     /// It will do nothing if the cell does not have a formula
     #[allow(clippy::expect_used)]
-    fn set_cell_value(&mut self, cell_reference: CellReferenceIndex, result: &CalcResult) {
+    fn set_cell_value(
+        &mut self,
+        cell_reference: CellReferenceIndex,
+        result: &CalcResult,
+    ) -> Result<(), String> {
         let CellReferenceIndex { sheet, column, row } = cell_reference;
-        let cell = &self.workbook.worksheets[sheet as usize].sheet_data[&row][&column];
+        let cell = self
+            .workbook
+            .worksheet(sheet)?
+            .cell(row, column)
+            .cloned()
+            .unwrap_or_default();
         let s = cell.get_style();
+        // If the cell is a dynamic cell we need to delete all the cells in the range
+        if let Some((width, height)) = cell.get_dynamic_range() {
+            for r in row..row + height {
+                for c in column..column + width {
+                    // skip the "mother" cell
+                    if r == row && c == column {
+                        continue;
+                    }
+                    self.cell_clear_contents(sheet, r, c)?;
+                }
+            }
+        }
         if let Some(f) = cell.get_formula() {
             match result {
                 CalcResult::Number(value) => {
@@ -594,19 +776,138 @@ impl Model {
                         ei: error.clone(),
                     };
                 }
+                CalcResult::EmptyCell | CalcResult::EmptyArg => {
+                    *self.workbook.worksheets[sheet as usize]
+                        .sheet_data
+                        .get_mut(&row)
+                        .expect("expected a row")
+                        .get_mut(&column)
+                        .expect("expected a column") = Cell::CellFormulaNumber { f, s, v: 0.0 };
+                }
                 CalcResult::Range { left, right } => {
                     if left.sheet == right.sheet
                         && left.row == right.row
                         && left.column == right.column
                     {
-                        let intersection_cell = CellReferenceIndex {
+                        // There is only one cell
+                        let single_cell = CellReferenceIndex {
                             sheet: left.sheet,
                             column: left.column,
                             row: left.row,
                         };
-                        let v = self.evaluate_cell(intersection_cell);
-                        self.set_cell_value(cell_reference, &v);
+                        let v = self.evaluate_cell(single_cell);
+                        self.set_cell_value(cell_reference, &v)?;
                     } else {
+                        // We need to check if all the cells are empty, otherwise we mark the cell as #SPILL!
+                        let mut all_empty = true;
+                        for r in row..=row + right.row - left.row {
+                            for c in column..=column + right.column - left.column {
+                                if r == row && c == column {
+                                    continue;
+                                }
+                                if !self.is_empty_cell(sheet, r, c).unwrap_or(false) {
+                                    all_empty = false;
+                                    break;
+                                }
+                            }
+                        }
+                        if !all_empty {
+                            let o = match self.cell_reference_to_string(&cell_reference) {
+                                Ok(s) => s,
+                                Err(_) => "".to_string(),
+                            };
+                            *self.workbook.worksheets[sheet as usize]
+                                .sheet_data
+                                .get_mut(&row)
+                                .expect("expected a row")
+                                .get_mut(&column)
+                                .expect("expected a column") = Cell::DynamicCellFormulaError {
+                                f,
+                                s,
+                                o,
+                                m: "Result would spill to non empty cells".to_string(),
+                                ei: Error::SPILL,
+                                r: (1, 1),
+                                a: false,
+                            };
+                            return Ok(());
+                        }
+                        // evaluate all the cells in that range
+                        for r in left.row..=right.row {
+                            for c in left.column..=right.column {
+                                let cell_reference = CellReferenceIndex {
+                                    sheet: left.sheet,
+                                    row: r,
+                                    column: c,
+                                };
+                                // FIXME: We ned to return an error
+                                self.evaluate_cell(cell_reference);
+                            }
+                        }
+                        // now write the result in the target
+                        for r in left.row..=right.row {
+                            let row_delta = r - left.row;
+                            for c in left.column..=right.column {
+                                let column_delta = c - left.column;
+                                // We need to put whatever is in (left.sheet, r, c) in
+                                // (sheet, row + row_delta, column + column_delta)
+                                // But we need to preserve the style
+                                let target_row = row + row_delta;
+                                let target_column = column + column_delta;
+                                let cell = self
+                                    .workbook
+                                    .worksheet(left.sheet)?
+                                    .cell(r, c)
+                                    .cloned()
+                                    .unwrap_or_default();
+                                let cell_reference = CellReferenceIndex {
+                                    sheet: left.sheet,
+                                    row: r,
+                                    column: c,
+                                };
+                                let v = self.get_cell_value(&cell, cell_reference);
+                                if row == target_row && column == target_column {
+                                    // let cell_reference = CellReferenceIndex { sheet, row, column };
+                                    // self.set_cell_value(cell_reference, &v);
+                                    self.set_spill_cell_with_formula_value(
+                                        sheet,
+                                        target_row,
+                                        target_column,
+                                        (right.column - left.column + 1, right.row - left.row + 1),
+                                        &v,
+                                        s,
+                                        f,
+                                    )?;
+                                    continue;
+                                }
+                                self.set_spill_cell_with_value(
+                                    sheet,
+                                    target_row,
+                                    target_column,
+                                    (row, column),
+                                    &v,
+                                )?;
+                            }
+                        }
+                    }
+                }
+                CalcResult::Array(array) => {
+                    let width = array[0].len() as i32;
+                    let height = array.len() as i32;
+                    // First we check that we don't spill:
+                    let mut all_empty = true;
+                    for r in row..row + height {
+                        for c in column..column + width {
+                            if r == row && c == column {
+                                continue;
+                            }
+                            if !self.is_empty_cell(sheet, r, c).unwrap_or(false) {
+                                all_empty = false;
+                                break;
+                            }
+                        }
+                    }
+                    if !all_empty {
                         let o = match self.cell_reference_to_string(&cell_reference) {
                             Ok(s) => s,
                             Err(_) => "".to_string(),
@@ -620,57 +921,65 @@ impl Model {
                             f,
                             s,
                             o,
-                            m: "Implicit Intersection not implemented".to_string(),
-                            ei: Error::NIMPL,
+                            m: "Result would spill to non empty cells".to_string(),
+                            ei: Error::SPILL,
                         };
+                        return Ok(());
+                    }
+                    let mut target_row = row;
+                    for data_row in array {
+                        let mut target_column = column;
+                        for value in data_row {
+                            if row == target_row && column == target_column {
+                                // This is the root cell of the dynamic array
+                                let cell_reference = CellReferenceIndex { sheet, row, column };
+                                let v = match value {
+                                    ArrayNode::Boolean(b) => CalcResult::Boolean(*b),
+                                    ArrayNode::Number(f) => CalcResult::Number(*f),
+                                    ArrayNode::String(s) => CalcResult::String(s.clone()),
+                                    ArrayNode::Error(error) => CalcResult::new_error(
+                                        error.clone(),
+                                        cell_reference,
+                                        error.to_localized_error_string(&self.language),
+                                    ),
+                                };
+                                self.set_spill_cell_with_formula_value(
+                                    sheet,
+                                    target_row,
+                                    target_column,
+                                    (width, height),
+                                    &v,
+                                    s,
+                                    f,
+                                )?;
+                                target_column += 1;
+                                continue;
+                            }
+                            let v = match value {
+                                ArrayNode::Boolean(b) => CalcResult::Boolean(*b),
+                                ArrayNode::Number(f) => CalcResult::Number(*f),
+                                ArrayNode::String(s) => CalcResult::String(s.clone()),
+                                ArrayNode::Error(error) => CalcResult::new_error(
+                                    error.clone(),
+                                    cell_reference,
+                                    error.to_localized_error_string(&self.language),
+                                ),
+                            };
+                            self.set_spill_cell_with_value(
+                                sheet,
+                                target_row,
+                                target_column,
+                                (row, column),
+                                &v,
+                            )?;
+                            target_column += 1;
+                        }
+                        target_row += 1;
                     }
-                    // if let Some(intersection_cell) = implicit_intersection(&cell_reference, &range)
-                    // {
-                    //     let v = self.evaluate_cell(intersection_cell);
-                    //     self.set_cell_value(cell_reference, &v);
-                    // } else {
-                    //     let o = match self.cell_reference_to_string(&cell_reference) {
-                    //         Ok(s) => s,
-                    //         Err(_) => "".to_string(),
-                    //     };
-                    //     *self.workbook.worksheets[sheet as usize]
-                    //         .sheet_data
-                    //         .get_mut(&row)
-                    //         .expect("expected a row")
-                    //         .get_mut(&column)
-                    //         .expect("expected a column") = Cell::CellFormulaError {
-                    //         f,
-                    //         s,
-                    //         o,
-                    //         m: "Invalid reference".to_string(),
-                    //         ei: Error::VALUE,
-                    //     };
-                    // }
-                }
-                CalcResult::EmptyCell | CalcResult::EmptyArg => {
-                    *self.workbook.worksheets[sheet as usize]
-                        .sheet_data
-                        .get_mut(&row)
-                        .expect("expected a row")
-                        .get_mut(&column)
-                        .expect("expected a column") = Cell::CellFormulaNumber { f, s, v: 0.0 };
-                }
-                CalcResult::Array(_) => {
-                    *self.workbook.worksheets[sheet as usize]
-                        .sheet_data
-                        .get_mut(&row)
-                        .expect("expected a row")
-                        .get_mut(&column)
-                        .expect("expected a column") = Cell::CellFormulaError {
-                        f,
-                        s,
-                        o: "".to_string(),
-                        m: "Arrays not supported yet".to_string(),
-                        ei: Error::NIMPL,
-                    };
                 }
             }
         }
+        Ok(())
     }
 
     /// Sets the color of the sheet tab.
@@ -714,16 +1023,18 @@ impl Model {
         Ok(())
     }
 
+    // EmptyCell, Boolean, Number, String, Error
     fn get_cell_value(&self, cell: &Cell, cell_reference: CellReferenceIndex) -> CalcResult {
         use Cell::*;
         match cell {
             EmptyCell { .. } => CalcResult::EmptyCell,
-            BooleanCell { v, .. } => CalcResult::Boolean(*v),
-            NumberCell { v, .. } => CalcResult::Number(*v),
-            ErrorCell { ei, .. } => {
+            BooleanCell { v, .. } | SpillBooleanCell { v, .. } => CalcResult::Boolean(*v),
+            NumberCell { v, .. } | SpillNumberCell { v, .. } => CalcResult::Number(*v),
+            ErrorCell { ei, .. } | SpillErrorCell { ei, .. } => {
                 let message = ei.to_localized_error_string(&self.language);
                 CalcResult::new_error(ei.clone(), cell_reference, message)
             }
+            SpillStringCell { v, .. } => CalcResult::String(v.clone()),
             SharedString { si, .. } => {
                 if let Some(s) = self.workbook.shared_strings.get(*si as usize) {
                     CalcResult::String(s.clone())
@@ -732,15 +1043,21 @@ impl Model {
                     CalcResult::new_error(Error::ERROR, cell_reference, message)
                 }
             }
-            CellFormula { .. } => CalcResult::Error {
+            DynamicCellFormula { .. } | CellFormula { .. } => CalcResult::Error {
                 error: Error::ERROR,
                 origin: cell_reference,
                 message: "Unevaluated formula".to_string(),
             },
-            CellFormulaBoolean { v, .. } => CalcResult::Boolean(*v),
-            CellFormulaNumber { v, .. } => CalcResult::Number(*v),
-            CellFormulaString { v, .. } => CalcResult::String(v.clone()),
-            CellFormulaError { ei, o, m, .. } => {
+            DynamicCellFormulaBoolean { v, .. } | CellFormulaBoolean { v, .. } => {
+                CalcResult::Boolean(*v)
+            }
+            DynamicCellFormulaNumber { v, .. } | CellFormulaNumber { v, .. } => {
+                CalcResult::Number(*v)
+            }
+            DynamicCellFormulaString { v, .. } | CellFormulaString { v, .. } => {
+                CalcResult::String(v.clone())
+            }
+            DynamicCellFormulaError { ei, o, m, .. } | CellFormulaError { ei, o, m, .. } => {
                 if let Some(cell_reference) = self.parse_reference(o) {
                     CalcResult::new_error(ei.clone(), cell_reference, m.clone())
                 } else {
@@ -810,9 +1127,10 @@ impl Model {
                         self.cells.insert(key, CellState::Evaluating);
                     }
                 }
-                let node = &self.parsed_formulas[cell_reference.sheet as usize][f as usize].clone();
-                let result = self.evaluate_node_in_context(node, cell_reference);
-                self.set_cell_value(cell_reference, &result);
+                let (node, _static_result) =
+                    &self.parsed_formulas[cell_reference.sheet as usize][f as usize];
+                let result = self.evaluate_node_in_context(&node.clone(), cell_reference);
+                let _ = self.set_cell_value(cell_reference, &result);
                 // mark cell as evaluated
                 self.cells.insert(key, CellState::Evaluated);
                 result
@@ -1100,7 +1418,7 @@ impl Model {
             Some(cell) => match cell.get_formula() {
                 None => cell.get_text(&self.workbook.shared_strings, &self.language),
                 Some(i) => {
-                    let formula = &self.parsed_formulas[sheet as usize][i as usize];
+                    let formula = &self.parsed_formulas[sheet as usize][i as usize].0;
                     let cell_ref = CellReferenceRC {
                         sheet: self.workbook.worksheets[sheet as usize].get_name(),
                         row: target_row,
@@ -1203,7 +1521,8 @@ impl Model {
                         .get(sheet as usize)
                         .ok_or("missing sheet")?
                         .get(formula_index as usize)
-                        .ok_or("missing formula")?;
+                        .ok_or("missing formula")?
+                        .0;
                     let cell_ref = CellReferenceRC {
                         sheet: worksheet.get_name(),
                         row,
@@ -1437,6 +1756,25 @@ impl Model {
         column: i32,
         value: String,
     ) -> Result<(), String> {
+        // We need to check if the cell is part of a dynamic array
+        let cell = self
+            .workbook
+            .worksheet(sheet)?
+            .cell(row, column)
+            .cloned()
+            .unwrap_or_default();
+        // If the cell is a dynamic cell we need to delete all the cells in the range
+        if let Some((width, height)) = cell.get_dynamic_range() {
+            for r in row..row + height {
+                for c in column..column + width {
+                    // skip the "mother" cell
+                    if r == row && c == column {
+                        continue;
+                    }
+                    self.cell_clear_contents(sheet, r, c)?;
+                }
+            }
+        }
         // If value starts with "'" then we force the style to be quote_prefix
         let style_index = self.get_cell_style_index(sheet, row, column)?;
         if let Some(new_value) = value.strip_prefix('\'') {
@@ -1462,7 +1800,8 @@ impl Model {
                     self.set_cell_with_formula(sheet, row, column, formula, new_style_index)?;
                 // Update the style if needed
                 let cell = CellReferenceIndex { sheet, row, column };
-                let parsed_formula = &self.parsed_formulas[sheet as usize][formula_index as usize];
+                let parsed_formula =
+                    &self.parsed_formulas[sheet as usize][formula_index as usize].0;
                 if let Some(units) = self.compute_node_units(parsed_formula, &cell) {
                     let new_style_index = self
                         .workbook
@@ -1544,6 +1883,7 @@ impl Model {
                 _ => parsed_formula = new_parsed_formula,
             }
         }
+        let static_result = run_static_analysis_on_node(&parsed_formula);
 
         let s = to_rc_format(&parsed_formula);
         let mut formula_index: i32 = -1;
@@ -1552,7 +1892,7 @@ impl Model {
         }
         if formula_index == -1 {
             shared_formulas.push(s);
-            self.parsed_formulas[sheet as usize].push(parsed_formula);
+            self.parsed_formulas[sheet as usize].push((parsed_formula, static_result));
             formula_index = (shared_formulas.len() as i32) - 1;
         }
         worksheet.set_cell_with_formula(row, column, formula_index, style)?;
@@ -1747,7 +2087,7 @@ impl Model {
         };
         match cell.get_formula() {
             Some(formula_index) => {
-                let formula = &self.parsed_formulas[sheet as usize][formula_index as usize];
+                let formula = &self.parsed_formulas[sheet as usize][formula_index as usize].0;
                 let cell_ref = CellReferenceRC {
                     sheet: worksheet.get_name(),
                     row,
@@ -1762,6 +2102,14 @@ impl Model {
     /// Returns a list of all cells
     pub fn get_all_cells(&self) -> Vec<CellIndex> {
         let mut cells = Vec::new();
+        for (sheet, row, column) in &self.workbook.calc_chain {
+            let cell = CellIndex {
+                row: *row,
+                column: *column,
+                index: *sheet,
+            };
+            cells.push(cell);
+        }
         for (index, sheet) in self.workbook.worksheets.iter().enumerate() {
             let mut sorted_rows: Vec<_> = sheet.sheet_data.keys().collect();
             sorted_rows.sort_unstable();
@@ -1788,6 +2136,8 @@ impl Model {
 
         let cells = self.get_all_cells();
 
+        // First evaluate all dynamic arrays
+        
         for cell in cells {
             self.evaluate_cell(CellReferenceIndex {
                 sheet: cell.index,
@@ -1818,9 +2168,22 @@ impl Model {
     /// # }
     /// ```
     pub fn cell_clear_contents(&mut self, sheet: u32, row: i32, column: i32) -> Result<(), String> {
-        self.workbook
-            .worksheet_mut(sheet)?
-            .cell_clear_contents(row, column)?;
+        // If it has a spill formula we need to delete the contents of all the spilled cells
+        let worksheet = self.workbook.worksheet_mut(sheet)?;
+        if let Some(cell) = worksheet.cell(row, column) {
+            if let Some((width, height)) = cell.get_dynamic_range() {
+                for r in row..row + height {
+                    for c in column..column + width {
+                        if row == r && column == c {
+                            // we skip the root cell
+                            continue;
+                        }
+                        worksheet.cell_clear_contents(r, c)?;
+                    }
+                }
+            }
+        }
+        worksheet.cell_clear_contents(row, column)?;
         Ok(())
     }
 
@@ -1845,6 +2208,18 @@ impl Model {
     /// # }
     pub fn cell_clear_all(&mut self, sheet: u32, row: i32, column: i32) -> Result<(), String> {
         let worksheet = self.workbook.worksheet_mut(sheet)?;
+        // Delete the contents of spilled cells if any
+        if let Some(cell) = worksheet.cell(row, column) {
+            if let Some((width, height)) = cell.get_dynamic_range() {
+                for r in row..row + height {
+                    for c in column..column + width {
+                        if row == r && c == column {
+                            worksheet.cell_clear_contents(r, c)?;
+                        }
+                    }
+                }
+            }
+        }
 
         let sheet_data = &mut worksheet.sheet_data;
         if let Some(row_data) = sheet_data.get_mut(&row) {
@@ -1931,32 +2306,16 @@ impl Model {
     }
 
     /// Returns markup representation of the given `sheet`.
-    pub fn get_sheet_markup(
-        &self,
-        sheet: u32,
-        start_row: i32,
-        start_column: i32,
-        width: i32,
-        height: i32,
-    ) -> Result<String, String> {
-        let mut table: Vec<Vec<String>> = Vec::new();
-        if start_row < 1 || start_column < 1 {
-            return Err("Start row and column must be positive".to_string());
-        }
-        if start_row + height >= LAST_ROW || start_column + width >= LAST_COLUMN {
-            return Err("Start row and column exceed the maximum allowed".to_string());
-        }
-        if height <= 0 || width <= 0 {
-            return Err("Height must be positive and width must be positive".to_string());
-        }
+    pub fn get_sheet_markup(&self, sheet: u32) -> Result<String, String> {
+        let worksheet = self.workbook.worksheet(sheet)?;
+        let dimension = worksheet.dimension();
 
-        // a mutable vector to store the column widths of length `width + 1`
-        let mut column_widths: Vec<f64> = vec![0.0; (width + 1) as usize];
+        let mut rows = Vec::new();
 
-        for row in start_row..(start_row + height + 1) {
+        for row in 1..(dimension.max_row + 1) {
             let mut row_markup: Vec<String> = Vec::new();
 
-            for column in start_column..(start_column + width + 1) {
+            for column in 1..(dimension.max_column + 1) {
                 let mut cell_markup = match self.get_cell_formula(sheet, row, column)? {
                     Some(formula) => formula,
                     None => self.get_formatted_cell_value(sheet, row, column)?,
@@ -1965,34 +2324,12 @@ impl Model {
                 if style.font.b {
                     cell_markup = format!("**{cell_markup}**")
                 }
-                column_widths[(column - start_column) as usize] =
-                    column_widths[(column - start_column) as usize].max(cell_markup.len() as f64);
                 row_markup.push(cell_markup);
             }
 
-            table.push(row_markup);
+            rows.push(row_markup.join("|"));
         }
-        let mut rows = Vec::new();
-        for (j, row) in table.iter().enumerate() {
-            if j == 1 {
-                let mut row_markup = String::new();
-                for i in 0..(width + 1) {
-                    row_markup.push('|');
-                    let wide = column_widths[i as usize] as usize;
-                    row_markup.push_str(&"-".repeat(wide));
-                }
-                rows.push(row_markup);
-            }
-            let mut row_markup = String::new();
 
-            for (i, cell) in row.iter().enumerate() {
-                row_markup.push('|');
-                let wide = column_widths[i] as usize;
-                // Add padding to the cell content
-                row_markup.push_str(&format!("{:<wide$}", cell, wide = wide));
-            }
-            rows.push(row_markup);
-        }
         Ok(rows.join("\n"))
     }
 

base/src/new_empty.rs

@@ -8,6 +8,7 @@ use crate::{
     expressions::{
         lexer::LexerMode,
         parser::{
+            static_analysis::run_static_analysis_on_node,
             stringify::{rename_sheet_in_node, to_rc_format, to_string},
             Parser,
         },
@@ -94,7 +95,8 @@ impl Model {
             let mut parse_formula = Vec::new();
             for formula in shared_formulas {
                 let t = self.parser.parse(formula, &cell_reference);
-                parse_formula.push(t);
+                let static_result = run_static_analysis_on_node(&t);
+                parse_formula.push((t, static_result));
             }
             self.parsed_formulas.push(parse_formula);
         }

base/src/test/mod.rs

@@ -52,6 +52,7 @@ mod test_fn_offset;
 mod test_number_format;
 
 mod test_arrays;
+mod test_dynamic_arrays;
 mod test_escape_quotes;
 mod test_extend;
 mod test_fn_fv;

base/src/test/test_dynamic_arrays.rs

@@ -0,0 +1,50 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::test::util::new_empty_model;
+
+#[test]
+fn they_spill() {
+    let mut model = new_empty_model();
+    model._set("A1", "42");
+    model._set("A2", "5");
+    model._set("A3", "7");
+
+    model._set("B1", "=A1:A3");
+
+    model.evaluate();
+
+    assert_eq!(model._get_text("B1"), *"42");
+    assert_eq!(model._get_text("B2"), *"5");
+    assert_eq!(model._get_text("B3"), *"7");
+}
+
+#[test]
+fn spill_error() {
+    let mut model = new_empty_model();
+    model._set("A1", "42");
+    model._set("A2", "5");
+    model._set("A3", "7");
+
+    model._set("B1", "=A1:A3");
+    model._set("B2", "4");
+
+    model.evaluate();
+
+    assert_eq!(model._get_text("B1"), *"#SPILL!");
+    assert_eq!(model._get_text("B2"), *"4");
+    assert_eq!(model._get_text("B3"), *"");
+}
+
+#[test]
+fn second_evaluation() {
+    let mut model = new_empty_model();
+    model._set("C3", "={1,2,3}");
+    model.evaluate();
+
+    assert_eq!(model._get_text("D3"), "2");
+
+    model._set("D8", "23");
+    model.evaluate();
+
+    assert_eq!(model._get_text("D3"), "2");
+}

base/src/test/test_implicit_intersection.rs

@@ -3,7 +3,7 @@
 use crate::test::util::new_empty_model;
 
 #[test]
-fn simple_colum() {
+fn simple_column() {
     let mut model = new_empty_model();
     // We populate cells A1 to A3
     model._set("A1", "1");
@@ -30,7 +30,7 @@ fn return_of_array_is_n_impl() {
 
     model.evaluate();
 
-    assert_eq!(model._get_text("C2"), "#N/IMPL!".to_string());
+    assert_eq!(model._get_text("C2"), "1".to_string());
     assert_eq!(model._get_text("D2"), "1.89188842".to_string());
 }
 

base/src/test/test_sheet_markup.rs

@@ -21,7 +21,7 @@ fn test_sheet_markup() {
     model.set_cell_style(0, 4, 1, &style).unwrap();
 
     assert_eq!(
-        model.get_sheet_markup(0, 1, 1, 4, 2),
+        model.get_sheet_markup(0),
         Ok("**Item**|**Cost**\nRent|$600\nElectricity|$200\n**Total**|=SUM(B2:B3)".to_string()),
     )
 }

base/src/test/test_styles.rs

@@ -62,17 +62,3 @@ fn test_create_named_style() {
     let style = model.get_style_for_cell(0, 1, 1).unwrap();
     assert!(style.font.b);
 }
-
-#[test]
-fn empty_models_have_two_fills() {
-    let model = new_empty_model();
-    assert_eq!(model.workbook.styles.fills.len(), 2);
-    assert_eq!(
-        model.workbook.styles.fills[0].pattern_type,
-        "none".to_string()
-    );
-    assert_eq!(
-        model.workbook.styles.fills[1].pattern_type,
-        "gray125".to_string()
-    );
-}

base/src/test/user_model/mod.rs

@@ -5,8 +5,10 @@ mod test_border;
 mod test_clear_cells;
 mod test_column_style;
 mod test_defined_names;
+mod test_delete_evaluates;
 mod test_delete_row_column_formatting;
 mod test_diff_queue;
+mod test_dynamic_array;
 mod test_evaluation;
 mod test_general;
 mod test_grid_lines;

base/src/test/user_model/test_delete_evaluates.rs

@@ -0,0 +1,47 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::{expressions::types::Area, UserModel};
+
+#[test]
+fn clear_cell_contents_evaluates() {
+    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
+    model.set_user_input(0, 1, 1, "42").unwrap();
+    model.set_user_input(0, 1, 2, "=A1").unwrap();
+    assert_eq!(
+        model.get_formatted_cell_value(0, 1, 2),
+        Ok("42".to_string())
+    );
+    model
+        .range_clear_contents(&Area {
+            sheet: 0,
+            row: 1,
+            column: 1,
+            width: 1,
+            height: 1,
+        })
+        .unwrap();
+
+    assert_eq!(model.get_formatted_cell_value(0, 1, 2), Ok("0".to_string()));
+}
+
+#[test]
+fn clear_cell_all_evaluates() {
+    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
+    model.set_user_input(0, 1, 1, "42").unwrap();
+    model.set_user_input(0, 1, 2, "=A1").unwrap();
+    assert_eq!(
+        model.get_formatted_cell_value(0, 1, 2),
+        Ok("42".to_string())
+    );
+    model
+        .range_clear_all(&Area {
+            sheet: 0,
+            row: 1,
+            column: 1,
+            width: 1,
+            height: 1,
+        })
+        .unwrap();
+
+    assert_eq!(model.get_formatted_cell_value(0, 1, 2), Ok("0".to_string()));
+}

base/src/test/user_model/test_dynamic_array.rs

@@ -0,0 +1,130 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::{expressions::types::Area, UserModel};
+
+// Tests basic behavour.
+#[test]
+fn basic() {
+    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
+    // We put a value by the dynamic array to check the border conditions
+    model.set_user_input(0, 2, 1, "22").unwrap();
+    model.set_user_input(0, 1, 1, "={34,35,3}").unwrap();
+
+    assert_eq!(
+        model.get_formatted_cell_value(0, 1, 1),
+        Ok("34".to_string())
+    );
+}
+
+// Test that overwriting a dynamic array with a single value dissolves the array
+#[test]
+fn sett_user_input_mother() {
+    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
+    model.set_user_input(0, 1, 1, "={34,35,3}").unwrap();
+    assert_eq!(
+        model.get_formatted_cell_value(0, 1, 2),
+        Ok("35".to_string())
+    );
+    model.set_user_input(0, 1, 1, "123").unwrap();
+    assert_eq!(model.get_formatted_cell_value(0, 1, 2), Ok("".to_string()));
+}
+
+#[test]
+fn set_user_input_sibling() {
+    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
+    model.set_user_input(0, 1, 1, "={43,55,34}").unwrap();
+    assert_eq!(
+        model.get_formatted_cell_value(0, 1, 2),
+        Ok("55".to_string())
+    );
+    // This does nothing
+    model.set_user_input(0, 1, 2, "123").unwrap();
+    assert_eq!(
+        model.get_formatted_cell_value(0, 1, 2),
+        Ok("55".to_string())
+    );
+}
+
+#[test]
+fn basic_undo_redo() {
+    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
+    model.set_user_input(0, 1, 1, "={34,35,3}").unwrap();
+    assert_eq!(
+        model.get_formatted_cell_value(0, 1, 2),
+        Ok("35".to_string())
+    );
+    model.undo().unwrap();
+    assert_eq!(model.get_formatted_cell_value(0, 1, 2), Ok("".to_string()));
+    model.redo().unwrap();
+    assert_eq!(
+        model.get_formatted_cell_value(0, 1, 2),
+        Ok("35".to_string())
+    );
+}
+
+#[test]
+fn mixed_spills() {
+    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
+    // D9 => ={34,35,3}
+    model.set_user_input(0, 9, 4, "={34,35,3}").unwrap();
+    // F6 => ={1;2;3;4}
+    model.set_user_input(0, 6, 6, "={1;2;3;4}").unwrap();
+
+    // F6 should be #SPILL!
+    assert_eq!(
+        model.get_formatted_cell_value(0, 6, 6),
+        Ok("#SPILL!".to_string())
+    );
+
+    // We delete D9
+    model
+        .range_clear_contents(&Area {
+            sheet: 0,
+            row: 9,
+            column: 4,
+            width: 1,
+            height: 1,
+        })
+        .unwrap();
+
+    // F6 should be 1
+    assert_eq!(model.get_formatted_cell_value(0, 6, 6), Ok("1".to_string()));
+
+    // Now we undo that
+    model.undo().unwrap();
+    // F6 should be #SPILL!
+    assert_eq!(
+        model.get_formatted_cell_value(0, 6, 6),
+        Ok("#SPILL!".to_string())
+    );
+}
+
+#[test]
+fn spill_order_d9_f6() {
+    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
+    // D9 => ={1,2,3}
+    model.set_user_input(0, 9, 4, "={34,35,3}").unwrap();
+    // F6 => ={1;2;3;4}
+    model.set_user_input(0, 6, 6, "={1;2;3;4}").unwrap();
+
+    // F6 should be #SPILL!
+    assert_eq!(
+        model.get_formatted_cell_value(0, 6, 6),
+        Ok("#SPILL!".to_string())
+    );
+}
+
+#[test]
+fn spill_order_f6_d9() {
+    let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
+    // F6 => ={1;2;3;4}
+    model.set_user_input(0, 6, 6, "={1;2;3;4}").unwrap();
+    // D9 => ={1,2,3}
+    model.set_user_input(0, 9, 4, "={34,35,3}").unwrap();
+
+    // D9 should be #SPILL!
+    assert_eq!(
+        model.get_formatted_cell_value(0, 9, 4),
+        Ok("#SPILL!".to_string())
+    );
+}

base/src/types.rs

@@ -51,6 +51,9 @@ pub struct Workbook {
     pub metadata: Metadata,
     pub tables: HashMap<String, Table>,
     pub views: HashMap<u32, WorkbookView>,
+    /// Calculation chain of the dynamic arrays.
+    /// List of tuples (sheet_id, row, column)
+    pub calc_chain: Vec<(u32, i32, i32)>,
 }
 
 /// A defined name. The `sheet_id` is the sheet index in case the name is local
@@ -159,17 +162,17 @@ pub enum CellType {
     CompoundData = 128,
 }
 
+/// Cell types
+/// s is always the style index of the cell
 #[derive(Encode, Decode, Debug, Clone, PartialEq)]
 pub enum Cell {
     EmptyCell {
         s: i32,
     },
-
     BooleanCell {
         v: bool,
         s: i32,
     },
-
     NumberCell {
         v: f64,
         s: i32,
@@ -181,6 +184,7 @@ pub enum Cell {
     },
     // Always a shared string
     SharedString {
+        // string index
         si: i32,
         s: i32,
     },
@@ -189,13 +193,11 @@ pub enum Cell {
         f: i32,
         s: i32,
     },
-
     CellFormulaBoolean {
         f: i32,
         v: bool,
         s: i32,
     },
-
     CellFormulaNumber {
         f: i32,
         v: f64,
@@ -207,9 +209,9 @@ pub enum Cell {
         v: String,
         s: i32,
     },
-
     CellFormulaError {
         f: i32,
+        // error index
         ei: Error,
         s: i32,
         // Origin: Sheet3!C4
@@ -217,7 +219,81 @@ pub enum Cell {
         // Error Message: "Not implemented function"
         m: String,
     },
-    // TODO: Array formulas
+    // All Spill/dynamic cells have a boolean, a for array, if true it is an array formula
+    // Spill cells point to a mother cell (row, column)
+    SpillNumberCell {
+        v: f64,
+        s: i32,
+        // mother cell (row, column)
+        m: (i32, i32),
+    },
+    SpillBooleanCell {
+        v: bool,
+        s: i32,
+        // mother cell (row, column)
+        m: (i32, i32),
+    },
+    SpillErrorCell {
+        ei: Error,
+        s: i32,
+        // mother cell (row, column)
+        m: (i32, i32),
+    },
+    SpillStringCell {
+        v: String,
+        s: i32,
+        // mother cell (row, column)
+        m: (i32, i32),
+    },
+    // Dynamic cell formulas have a range (width, height)
+    DynamicCellFormula {
+        f: i32,
+        s: i32,
+        // range of the formula (width, height)
+        r: (i32, i32),
+        // true if the formula is a CSE formula
+        a: bool,
+    },
+    DynamicCellFormulaBoolean {
+        f: i32,
+        v: bool,
+        s: i32,
+        // range of the formula (width, height)
+        r: (i32, i32),
+        // true if the formula is a CSE formula
+        a: bool,
+    },
+    DynamicCellFormulaNumber {
+        f: i32,
+        v: f64,
+        s: i32,
+        // range of the formula (width, height)
+        r: (i32, i32),
+        // true if the formula is a CSE formula
+        a: bool,
+    },
+    DynamicCellFormulaString {
+        f: i32,
+        v: String,
+        s: i32,
+        // range of the formula (width, height)
+        r: (i32, i32),
+        // true if the formula is a CSE formula
+        a: bool,
+    },
+    DynamicCellFormulaError {
+        f: i32,
+        ei: Error,
+        s: i32,
+        // Cell origin of the error
+        o: String,
+        // Error message in text
+        m: String,
+        // range of the formula (width, height)
+        r: (i32, i32),
+        // true if the formula is a CSE formula
+        a: bool,
+    },
 }
 
 impl Default for Cell {
@@ -303,14 +379,7 @@ impl Default for Styles {
         Styles {
             num_fmts: vec![],
             fonts: vec![Default::default()],
-            fills: vec![
-                Default::default(),
-                Fill {
-                    pattern_type: "gray125".to_string(),
-                    fg_color: None,
-                    bg_color: None,
-                },
-            ],
+            fills: vec![Default::default()],
             borders: vec![Default::default()],
             cell_style_xfs: vec![Default::default()],
             cell_xfs: vec![Default::default()],

base/src/user_model/common.rs

@@ -13,8 +13,8 @@ use crate::{
     },
     model::Model,
     types::{
-        Alignment, BorderItem, CellType, Col, HorizontalAlignment, SheetProperties, SheetState,
-        Style, VerticalAlignment,
+        Alignment, BorderItem, Cell, CellType, Col, HorizontalAlignment, SheetProperties,
+        SheetState, Style, VerticalAlignment,
     },
     utils::is_valid_hex_color,
 };
@@ -24,6 +24,18 @@ use crate::user_model::history::{
 };
 
 use super::border_utils::is_max_border;
+
+#[derive(Serialize, Deserialize)]
+pub enum CellArrayStructure {
+    // It s just a single cell
+    SingleCell,
+    // It is part o a dynamic array
+    // (mother_row, mother_column, width, height)
+    DynamicChild(i32, i32, i32, i32),
+    // Mother of a dynamic array (width, height)
+    DynamicMother(i32, i32),
+}
+
 /// Data for the clipboard
 pub type ClipboardData = HashMap<i32, HashMap<i32, ClipboardCell>>;
 
@@ -293,19 +305,6 @@ impl UserModel {
         self.model.workbook.name = name.to_string();
     }
 
-    /// Get area markdown
-    pub fn get_sheet_markup(
-        &self,
-        sheet: u32,
-        row_start: i32,
-        column_start: i32,
-        row_end: i32,
-        column_end: i32,
-    ) -> Result<String, String> {
-        self.model
-            .get_sheet_markup(sheet, row_start, column_start, row_end, column_end)
-    }
-
     /// Undoes last change if any, places the change in the redo list and evaluates the model if needed
     ///
     /// See also:
@@ -640,6 +639,7 @@ impl UserModel {
             }
         }
         self.push_diff_list(diff_list);
+        self.evaluate_if_not_paused();
         Ok(())
     }
 
@@ -669,6 +669,7 @@ impl UserModel {
             }
         }
         self.push_diff_list(diff_list);
+        self.evaluate_if_not_paused();
         Ok(())
     }
 
@@ -1608,6 +1609,65 @@ impl UserModel {
         Ok(self.model.workbook.worksheet(sheet)?.show_grid_lines)
     }
 
+    /// Returns the geometric structure of a cell
+    pub fn get_cell_array_structure(
+        &self,
+        sheet: u32,
+        row: i32,
+        column: i32,
+    ) -> Result<CellArrayStructure, String> {
+        let cell = self
+            .model
+            .workbook
+            .worksheet(sheet)?
+            .cell(row, column)
+            .cloned()
+            .unwrap_or_default();
+        match cell {
+            Cell::EmptyCell { .. }
+            | Cell::BooleanCell { .. }
+            | Cell::NumberCell { .. }
+            | Cell::ErrorCell { .. }
+            | Cell::SharedString { .. }
+            | Cell::CellFormula { .. }
+            | Cell::CellFormulaBoolean { .. }
+            | Cell::CellFormulaNumber { .. }
+            | Cell::CellFormulaString { .. }
+            | Cell::CellFormulaError { .. } => Ok(CellArrayStructure::SingleCell),
+            Cell::SpillNumberCell { m, .. }
+            | Cell::SpillBooleanCell { m, .. }
+            | Cell::SpillErrorCell { m, .. }
+            | Cell::SpillStringCell { m, .. } => {
+                let (m_row, m_column) = m;
+                let m_cell = self
+                    .model
+                    .workbook
+                    .worksheet(sheet)?
+                    .cell(m_row, m_column)
+                    .cloned()
+                    .unwrap_or_default();
+                let (width, height) = match m_cell {
+                    Cell::DynamicCellFormula { r, .. }
+                    | Cell::DynamicCellFormulaBoolean { r, .. }
+                    | Cell::DynamicCellFormulaNumber { r, .. }
+                    | Cell::DynamicCellFormulaString { r, .. }
+                    | Cell::DynamicCellFormulaError { r, .. } => (r.0, r.1),
+                    _ => return Err("Invalid structure".to_string()),
+                };
+                Ok(CellArrayStructure::DynamicChild(
+                    m_row, m_column, width, height,
+                ))
+            }
+            Cell::DynamicCellFormula { r, .. }
+            | Cell::DynamicCellFormulaBoolean { r, .. }
+            | Cell::DynamicCellFormulaNumber { r, .. }
+            | Cell::DynamicCellFormulaString { r, .. }
+            | Cell::DynamicCellFormulaError { r, .. } => {
+                Ok(CellArrayStructure::DynamicMother(r.0, r.1))
+            }
+        }
+    }
+
     /// Returns a copy of the selected area
     pub fn copy_to_clipboard(&self) -> Result<Clipboard, String> {
         let selected_area = self.get_selected_view();
@@ -1910,6 +1970,24 @@ impl UserModel {
                     old_value,
                 } => {
                     needs_evaluation = true;
+                    let cell = self
+                        .model
+                        .workbook
+                        .worksheet(*sheet)?
+                        .cell(*row, *column)
+                        .cloned()
+                        .unwrap_or_default();
+                    if let Some((width, height)) = cell.get_dynamic_range() {
+                        for r in *row..*row + height {
+                            for c in *column..*column + width {
+                                // skip the "mother" cell
+                                if r == *row && c == *column {
+                                    continue;
+                                }
+                                self.model.cell_clear_contents(*sheet, r, c)?;
+                            }
+                        }
+                    }
                     match *old_value.clone() {
                         Some(value) => {
                             self.model

base/src/user_model/history.rs

@@ -5,18 +5,21 @@ use bitcode::{Decode, Encode};
 use crate::types::{Cell, Col, Row, SheetState, Style, Worksheet};
 
 #[derive(Clone, Encode, Decode)]
+#[cfg_attr(debug_assertions, derive(Debug))]
 pub(crate) struct RowData {
     pub(crate) row: Option<Row>,
     pub(crate) data: HashMap<i32, Cell>,
 }
 
 #[derive(Clone, Encode, Decode)]
+#[cfg_attr(debug_assertions, derive(Debug))]
 pub(crate) struct ColumnData {
     pub(crate) column: Option<Col>,
     pub(crate) data: HashMap<i32, Cell>,
 }
 
 #[derive(Clone, Encode, Decode)]
+#[cfg_attr(debug_assertions, derive(Debug))]
 pub(crate) enum Diff {
     // Cell diffs
     SetCellValue {

bindings/wasm/fix_types.py

@@ -201,6 +201,18 @@ defined_name_list_types = r"""
   getDefinedNameList(): DefinedName[];
 """
 
+cell_structure = r"""
+* @returns {any}
+*/
+  getCellArrayStructure(sheet: number, row: number, column: number): any;
+"""
+
+cell_structure_types = r"""
+* @returns {CellArrayStructure}
+*/
+  getCellArrayStructure(sheet: number, row: number, column: number): CellArrayStructure;
+"""
+
 def fix_types(text):
     text = text.replace(get_tokens_str, get_tokens_str_types)
     text = text.replace(update_style_str, update_style_str_types)
@@ -215,6 +227,7 @@ def fix_types(text):
     text = text.replace(clipboard, clipboard_types)
     text = text.replace(paste_from_clipboard, paste_from_clipboard_types)
     text = text.replace(defined_name_list, defined_name_list_types)
+    text = text.replace(cell_structure, cell_structure_types)
     with open("types.ts") as f:
         types_str = f.read()
         header_types = "{}\n\n{}".format(header, types_str)

bindings/wasm/src/lib.rs

@@ -673,17 +673,17 @@ impl Model {
             .map_err(|e| to_js_error(e.to_string()))
     }
 
-    #[wasm_bindgen(js_name = "getSheetMarkup")]
-    pub fn get_sheet_markup(
+    #[wasm_bindgen(js_name = "getCellArrayStructure")]
+    pub fn get_cell_array_structure(
         &self,
         sheet: u32,
-        start_row: i32,
-        start_column: i32,
-        end_row: i32,
-        end_column: i32,
-    ) -> Result<String, JsError> {
-        self.model
-            .get_sheet_markup(sheet, start_row, start_column, end_row, end_column)
-            .map_err(to_js_error)
+        row: i32,
+        column: i32,
+    ) -> Result<JsValue, JsError> {
+        let cell_structure = self
+            .model
+            .get_cell_array_structure(sheet, row, column)
+            .map_err(|e| to_js_error(e.to_string()))?;
+        serde_wasm_bindgen::to_value(&cell_structure).map_err(JsError::from)
     }
 }

bindings/wasm/types.ts

@@ -109,6 +109,11 @@ export interface MarkedToken {
   end: number;
 }
 
+export type CellArrayStructure =
+  | "SingleCell"
+  | { DynamicChild: [number, number, number, number] }
+  | { DynamicMother: [number, number] };
+
 export interface WorksheetProperties {
   name: string;
   color: string;
@@ -216,7 +221,7 @@ export interface SelectedView {
 // };
 
 // type ClipboardData = Record<string, Record <string, ClipboardCell>>;
-type ClipboardData = Map<number, Map <number, ClipboardCell>>;
+type ClipboardData = Map<number, Map<number, ClipboardCell>>;
 
 export interface ClipboardCell {
   text: string;
@@ -233,4 +238,4 @@ export interface DefinedName {
   name: string;
   scope?: number;
   formula: string;
-}
+}

webapp/IronCalc/.storybook/main.ts

@@ -2,7 +2,11 @@ import type { StorybookConfig } from "@storybook/react-vite";
 
 const config: StorybookConfig = {
   stories: ["../src/**/*.mdx", "../src/**/*.stories.@(js|jsx|mjs|ts|tsx)"],
-  addons: [],
+  addons: [
+    "@storybook/addon-essentials",
+    "@chromatic-com/storybook",
+    "@storybook/addon-interactions",
+  ],
   framework: {
     name: "@storybook/react-vite",
     options: {},

webapp/IronCalc/package.json

@@ -18,26 +18,31 @@
     "@emotion/react": "^11.14.0",
     "@emotion/styled": "^11.14.0",
     "@ironcalc/wasm": "file:../../bindings/wasm/pkg",
-    "@mui/material": "^7.1.1",
-    "@mui/system": "^7.1.1",
-    "i18next": "^25.2.1",
-    "lucide-react": "^0.513.0",
+    "@mui/material": "^6.4",
+    "@mui/system": "^6.4",
+    "i18next": "^23.11.1",
+    "lucide-react": "^0.473.0",
     "react-colorful": "^5.6.1",
-    "react-i18next": "^15.5.2"
+    "react-i18next": "^15.4.0"
   },
   "devDependencies": {
     "@biomejs/biome": "1.9.4",
-    "@storybook/react": "^9.0.5",
-    "@storybook/react-vite": "^9.0.5",
+    "@chromatic-com/storybook": "^3.2.4",
+    "@storybook/addon-essentials": "^8.6.0",
+    "@storybook/addon-interactions": "^8.6.0",
+    "@storybook/blocks": "^8.6.0",
+    "@storybook/react": "^8.6.0",
+    "@storybook/react-vite": "^8.6.0",
+    "@storybook/test": "^8.6.0",
     "@vitejs/plugin-react": "^4.2.1",
-    "react": "^19.1.0",
-    "react-dom": "^19.1.0",
-    "storybook": "^9.0.5",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
+    "storybook": "^8.6.0",
     "ts-node": "^10.9.2",
-    "typescript": "~5.8.3",
-    "vite": "^6.3.5",
+    "typescript": "~5.6.2",
+    "vite": "^6.2.0",
     "vite-plugin-svgr": "^4.2.0",
-    "vitest": "^3.2.2"
+    "vitest": "^3.0.7"
   },
   "peerDependencies": {
     "@types/react": "^18.0.0 || ^19.0.0",

webapp/IronCalc/src/IronCalc.tsx

@@ -1,6 +1,6 @@
 import "./index.css";
 import type { Model } from "@ironcalc/wasm";
-import { ThemeProvider } from "@mui/material";
+import ThemeProvider from "@mui/material/styles/ThemeProvider";
 import Workbook from "./components/Workbook/Workbook.tsx";
 import { WorkbookState } from "./components/workbookState.ts";
 import { theme } from "./theme.ts";

webapp/IronCalc/src/components/FormulaBar/FormulaBar.tsx

@@ -13,6 +13,7 @@ import type { WorkbookState } from "../workbookState";
 type FormulaBarProps = {
   cellAddress: string;
   formulaValue: string;
+  isPartOfArray: boolean;
   model: Model;
   workbookState: WorkbookState;
   onChange: () => void;
@@ -23,6 +24,7 @@ function FormulaBar(properties: FormulaBarProps) {
   const {
     cellAddress,
     formulaValue,
+    isPartOfArray,
     model,
     onChange,
     onTextUpdated,
@@ -62,6 +64,9 @@ function FormulaBar(properties: FormulaBarProps) {
             event.stopPropagation();
             event.preventDefault();
           }}
+          sx={{
+            color: isPartOfArray ? "grey" : "black",
+          }}
         >
           <Editor
             originalText={formulaValue}

webapp/IronCalc/src/components/Toolbar/Toolbar.tsx

@@ -40,7 +40,6 @@ import {
   ArrowMiddleFromLine,
   DecimalPlacesDecreaseIcon,
   DecimalPlacesIncreaseIcon,
-  Markdown,
 } from "../../icons";
 import { theme } from "../../theme";
 import BorderPicker from "../BorderPicker/BorderPicker";
@@ -75,7 +74,6 @@ type ToolbarProperties = {
   onClearFormatting: () => void;
   onIncreaseFontSize: (delta: number) => void;
   onDownloadPNG: () => void;
-  onCopyMarkdown: () => void;
   fillColor: string;
   fontColor: string;
   fontSize: number;
@@ -431,17 +429,6 @@ function Toolbar(properties: ToolbarProperties) {
       >
         <ImageDown />
       </StyledButton>
-      <StyledButton
-        type="button"
-        $pressed={false}
-        onClick={() => {
-          properties.onCopyMarkdown();
-        }}
-        disabled={!canEdit}
-        title={t("toolbar.selected_markdown")}
-      >
-        <Markdown />
-      </StyledButton>
 
       <ColorPicker
         color={properties.fontColor}

webapp/IronCalc/src/components/Workbook/Workbook.tsx

@@ -348,7 +348,28 @@ const Workbook = (props: { model: Model; workbookState: WorkbookState }) => {
       return workbookState.getEditingText();
     }
     const { sheet, row, column } = model.getSelectedView();
-    return model.getCellContent(sheet, row, column);
+    const r = model.getCellArrayStructure(sheet, row, column);
+    if (r === "SingleCell") {
+      return model.getCellContent(sheet, row, column);
+    }
+    if ("DynamicMother" in r) {
+      return model.getCellContent(sheet, row, column);
+    }
+    const [mother_row, mother_column, _] = r.DynamicChild; 
+    return model.getCellContent(sheet, mother_row, mother_column);
+  };
+
+  // returns true if it is either single cell or the root cell of an array
+  const isRootCellOfArray = () => {
+    const { sheet, row, column } = model.getSelectedView();
+    const r = model.getCellArrayStructure(sheet, row, column);
+    if (r === "SingleCell") {
+      return false;
+    }
+    if ("DynamicMother" in r) {
+      return false;
+    }
+    return true;
   };
 
   const getCellStyle = useCallback(() => {
@@ -558,26 +579,6 @@ const Workbook = (props: { model: Model; workbookState: WorkbookState }) => {
         onIncreaseFontSize={(delta: number) => {
           onIncreaseFontSize(delta);
         }}
-        onCopyMarkdown={async () => {
-          const {
-            sheet,
-            range: [rowStart, columnStart, rowEnd, columnEnd],
-          } = model.getSelectedView();
-          const row = Math.min(rowStart, rowEnd);
-          const column = Math.min(columnStart, columnEnd);
-          const width = Math.abs(columnEnd - columnStart) + 1;
-          const height = Math.abs(rowEnd - rowStart) + 1;
-          const markdown = model.getSheetMarkup(
-            sheet,
-            row,
-            column,
-            width,
-            height,
-          );
-          // Copy to clipboard
-          // NB: This will not work in non secure contexts or in iframes (i.e storybook)
-          await navigator.clipboard.writeText(markdown);
-        }}
         onDownloadPNG={() => {
           // creates a new canvas element in the visible part of the the selected area
           const worksheetCanvas = worksheetRef.current?.getCanvas();
@@ -587,15 +588,19 @@ const Workbook = (props: { model: Model; workbookState: WorkbookState }) => {
           const {
             range: [rowStart, columnStart, rowEnd, columnEnd],
           } = model.getSelectedView();
-          // NB: cells outside of the displayed area are not rendered
-          // I think the only reasonable way to do this would be server side.
+          const { topLeftCell, bottomRightCell } =
+            worksheetCanvas.getVisibleCells();
+          const firstRow = Math.max(rowStart, topLeftCell.row);
+          const firstColumn = Math.max(columnStart, topLeftCell.column);
+          const lastRow = Math.min(rowEnd, bottomRightCell.row);
+          const lastColumn = Math.min(columnEnd, bottomRightCell.column);
           let [x, y] = worksheetCanvas.getCoordinatesByCell(
-            rowStart,
-            columnStart,
+            firstRow,
+            firstColumn,
           );
           const [x1, y1] = worksheetCanvas.getCoordinatesByCell(
-            rowEnd + 1,
-            columnEnd + 1,
+            lastRow + 1,
+            lastColumn + 1,
           );
           const width = (x1 - x) * devicePixelRatio;
           const height = (y1 - y) * devicePixelRatio;
@@ -714,6 +719,7 @@ const Workbook = (props: { model: Model; workbookState: WorkbookState }) => {
         }}
         model={model}
         workbookState={workbookState}
+        isPartOfArray={isRootCellOfArray()}
       />
       <Worksheet
         model={model}

webapp/IronCalc/src/components/Worksheet/Worksheet.tsx

@@ -14,6 +14,7 @@ import {
   LAST_COLUMN,
   LAST_ROW,
   ROW_HEIGH_SCALE,
+  cellArrayStructureColor,
   outlineBackgroundColor,
   outlineColor,
 } from "../WorksheetCanvas/constants";
@@ -24,7 +25,7 @@ import {
   TOOLBAR_HEIGHT,
 } from "../constants";
 import type { Cell } from "../types";
-import type { WorkbookState } from "../workbookState";
+import { AreaType, type WorkbookState } from "../workbookState";
 import CellContextMenu from "./CellContextMenu";
 import usePointer from "./usePointer";
 
@@ -59,6 +60,8 @@ const Worksheet = forwardRef(
     const spacerElement = useRef<HTMLDivElement>(null);
     const cellOutline = useRef<HTMLDivElement>(null);
     const areaOutline = useRef<HTMLDivElement>(null);
+    const cellOutlineHandle = useRef<HTMLDivElement>(null);
+    const cellArrayStructure = useRef<HTMLDivElement>(null);
     const extendToOutline = useRef<HTMLDivElement>(null);
     const columnResizeGuide = useRef<HTMLDivElement>(null);
     const rowResizeGuide = useRef<HTMLDivElement>(null);
@@ -84,7 +87,9 @@ const Worksheet = forwardRef(
       const worksheetRef = worksheetElement.current;
 
       const outline = cellOutline.current;
+      const handle = cellOutlineHandle.current;
       const area = areaOutline.current;
+      const arrayStructure = cellArrayStructure.current;
       const extendTo = extendToOutline.current;
       const editor = editorElement.current;
 
@@ -95,10 +100,12 @@ const Worksheet = forwardRef(
         !columnHeadersRef ||
         !worksheetRef ||
         !outline ||
+        !handle ||
         !area ||
         !extendTo ||
         !scrollElement.current ||
-        !editor
+        !editor ||
+        !arrayStructure
       )
         return;
       // FIXME: This two need to be computed.
@@ -115,6 +122,8 @@ const Worksheet = forwardRef(
           rowGuide: rowGuideRef,
           columnHeaders: columnHeadersRef,
           cellOutline: outline,
+          cellOutlineHandle: handle,
+          cellArrayStructure: arrayStructure,
           areaOutline: area,
           extendToOutline: extendTo,
           editor: editor,
@@ -187,74 +196,203 @@ const Worksheet = forwardRef(
       worksheetCanvas.current = canvas;
     });
 
-    const { onPointerMove, onPointerDown, onPointerUp } = usePointer({
-      model,
-      workbookState,
-      refresh,
-      onColumnSelected: (column: number, shift: boolean) => {
-        let firstColumn = column;
-        let lastColumn = column;
-        if (shift) {
-          const { range } = model.getSelectedView();
-          firstColumn = Math.min(range[1], column, range[3]);
-          lastColumn = Math.max(range[3], column, range[1]);
-        }
-        model.setSelectedCell(1, firstColumn);
-        model.setSelectedRange(1, firstColumn, LAST_ROW, lastColumn);
-        refresh();
-      },
-      onRowSelected: (row: number, shift: boolean) => {
-        let firstRow = row;
-        let lastRow = row;
-        if (shift) {
-          const { range } = model.getSelectedView();
-          firstRow = Math.min(range[0], row, range[2]);
-          lastRow = Math.max(range[2], row, range[0]);
-        }
-        model.setSelectedCell(firstRow, 1);
-        model.setSelectedRange(firstRow, 1, lastRow, LAST_COLUMN);
-        refresh();
-      },
-      onAllSheetSelected: () => {
-        model.setSelectedCell(1, 1);
-        model.setSelectedRange(1, 1, LAST_ROW, LAST_COLUMN);
-      },
-      onCellSelected: (cell: Cell, event: React.MouseEvent) => {
-        event.preventDefault();
-        event.stopPropagation();
-        model.setSelectedCell(cell.row, cell.column);
-        refresh();
-      },
-      onAreaSelecting: (cell: Cell) => {
-        const canvas = worksheetCanvas.current;
-        if (!canvas) {
-          return;
-        }
-        const { row, column } = cell;
-        model.onAreaSelecting(row, column);
-        canvas.renderSheet();
-        refresh();
-      },
-      onAreaSelected: () => {
-        const styles = workbookState.getCopyStyles();
-        if (styles?.length) {
-          model.onPasteStyles(styles);
+    const { onPointerMove, onPointerDown, onPointerHandleDown, onPointerUp } =
+      usePointer({
+        model,
+        workbookState,
+        refresh,
+        onColumnSelected: (column: number, shift: boolean) => {
+          let firstColumn = column;
+          let lastColumn = column;
+          if (shift) {
+            const { range } = model.getSelectedView();
+            firstColumn = Math.min(range[1], column, range[3]);
+            lastColumn = Math.max(range[3], column, range[1]);
+          }
+          model.setSelectedCell(1, firstColumn);
+          model.setSelectedRange(1, firstColumn, LAST_ROW, lastColumn);
+          refresh();
+        },
+        onRowSelected: (row: number, shift: boolean) => {
+          let firstRow = row;
+          let lastRow = row;
+          if (shift) {
+            const { range } = model.getSelectedView();
+            firstRow = Math.min(range[0], row, range[2]);
+            lastRow = Math.max(range[2], row, range[0]);
+          }
+          model.setSelectedCell(firstRow, 1);
+          model.setSelectedRange(firstRow, 1, lastRow, LAST_COLUMN);
+          refresh();
+        },
+        onAllSheetSelected: () => {
+          model.setSelectedCell(1, 1);
+          model.setSelectedRange(1, 1, LAST_ROW, LAST_COLUMN);
+        },
+        onCellSelected: (cell: Cell, event: React.MouseEvent) => {
+          event.preventDefault();
+          event.stopPropagation();
+          model.setSelectedCell(cell.row, cell.column);
+          refresh();
+        },
+        onAreaSelecting: (cell: Cell) => {
           const canvas = worksheetCanvas.current;
           if (!canvas) {
             return;
           }
+          const { row, column } = cell;
+          model.onAreaSelecting(row, column);
           canvas.renderSheet();
-        }
-        workbookState.setCopyStyles(null);
-        if (worksheetElement.current) {
-          worksheetElement.current.style.cursor = "auto";
-        }
-        refresh();
-      },
-      canvasElement,
-      worksheetElement,
-      worksheetCanvas,
-    });
+          refresh();
+        },
+        onAreaSelected: () => {
+          const styles = workbookState.getCopyStyles();
+          if (styles?.length) {
+            model.onPasteStyles(styles);
+            const canvas = worksheetCanvas.current;
+            if (!canvas) {
+              return;
+            }
+            canvas.renderSheet();
+          }
+          workbookState.setCopyStyles(null);
+          if (worksheetElement.current) {
+            worksheetElement.current.style.cursor = "auto";
+          }
+          refresh();
+        },
+        onExtendToCell: (cell) => {
+          const canvas = worksheetCanvas.current;
+          if (!canvas) {
+            return;
+          }
+          const { row, column } = cell;
+          const {
+            range: [rowStart, columnStart, rowEnd, columnEnd],
+          } = model.getSelectedView();
+          // We are either extending by rows or by columns
+          // And we could be doing it in the positive direction (downwards or right)
+          // or the negative direction (upwards or left)
+
+          if (
+            row > rowEnd &&
+            ((column <= columnEnd && column >= columnStart) ||
+              (column < columnStart && columnStart - column < row - rowEnd) ||
+              (column > columnEnd && column - columnEnd < row - rowEnd))
+          ) {
+            // rows downwards
+            const area = {
+              type: AreaType.rowsDown,
+              rowStart: rowEnd + 1,
+              rowEnd: row,
+              columnStart,
+              columnEnd,
+            };
+            workbookState.setExtendToArea(area);
+            canvas.renderSheet();
+          } else if (
+            row < rowStart &&
+            ((column <= columnEnd && column >= columnStart) ||
+              (column < columnStart && columnStart - column < rowStart - row) ||
+              (column > columnEnd && column - columnEnd < rowStart - row))
+          ) {
+            // rows upwards
+            const area = {
+              type: AreaType.rowsUp,
+              rowStart: row,
+              rowEnd: rowStart,
+              columnStart,
+              columnEnd,
+            };
+            workbookState.setExtendToArea(area);
+            canvas.renderSheet();
+          } else if (
+            column > columnEnd &&
+            ((row <= rowEnd && row >= rowStart) ||
+              (row < rowStart && rowStart - row < column - columnEnd) ||
+              (row > rowEnd && row - rowEnd < column - columnEnd))
+          ) {
+            // columns right
+            const area = {
+              type: AreaType.columnsRight,
+              rowStart,
+              rowEnd,
+              columnStart: columnEnd + 1,
+              columnEnd: column,
+            };
+            workbookState.setExtendToArea(area);
+            canvas.renderSheet();
+          } else if (
+            column < columnStart &&
+            ((row <= rowEnd && row >= rowStart) ||
+              (row < rowStart && rowStart - row < columnStart - column) ||
+              (row > rowEnd && row - rowEnd < columnStart - column))
+          ) {
+            // columns left
+            const area = {
+              type: AreaType.columnsLeft,
+              rowStart,
+              rowEnd,
+              columnStart: column,
+              columnEnd: columnStart,
+            };
+            workbookState.setExtendToArea(area);
+            canvas.renderSheet();
+          }
+        },
+        onExtendToEnd: () => {
+          const canvas = worksheetCanvas.current;
+          if (!canvas) {
+            return;
+          }
+          const { sheet, range } = model.getSelectedView();
+          const extendedArea = workbookState.getExtendToArea();
+          if (!extendedArea) {
+            return;
+          }
+          const rowStart = Math.min(range[0], range[2]);
+          const height = Math.abs(range[2] - range[0]) + 1;
+          const width = Math.abs(range[3] - range[1]) + 1;
+          const columnStart = Math.min(range[1], range[3]);
+
+          const area = {
+            sheet,
+            row: rowStart,
+            column: columnStart,
+            width,
+            height,
+          };
+
+          switch (extendedArea.type) {
+            case AreaType.rowsDown:
+              model.autoFillRows(area, extendedArea.rowEnd);
+              break;
+            case AreaType.rowsUp: {
+              model.autoFillRows(area, extendedArea.rowStart);
+              break;
+            }
+            case AreaType.columnsRight: {
+              model.autoFillColumns(area, extendedArea.columnEnd);
+              break;
+            }
+            case AreaType.columnsLeft: {
+              model.autoFillColumns(area, extendedArea.columnStart);
+              break;
+            }
+          }
+          model.setSelectedRange(
+            Math.min(rowStart, extendedArea.rowStart),
+            Math.min(columnStart, extendedArea.columnStart),
+            Math.max(rowStart + height - 1, extendedArea.rowEnd),
+            Math.max(columnStart + width - 1, extendedArea.columnEnd),
+          );
+          workbookState.clearExtendToArea();
+          canvas.renderSheet();
+        },
+        canvasElement,
+        worksheetElement,
+        worksheetCanvas,
+      });
 
     const onScroll = (): void => {
       if (!scrollElement.current || !worksheetCanvas.current) {
@@ -329,7 +467,12 @@ const Worksheet = forwardRef(
             />
           </EditorWrapper>
           <AreaOutline ref={areaOutline} />
+          <CellArrayStructure ref={cellArrayStructure} />
           <ExtendToOutline ref={extendToOutline} />
+          <CellOutlineHandle
+            ref={cellOutlineHandle}
+            onPointerDown={onPointerHandleDown}
+          />
           <ColumnResizeGuide ref={columnResizeGuide} />
           <RowResizeGuide ref={rowResizeGuide} />
           <ColumnHeaders ref={columnHeaders} />
@@ -494,6 +637,12 @@ const AreaOutline = styled("div")`
   background-color: ${outlineBackgroundColor};
 `;
 
+const CellArrayStructure = styled("div")`
+  position: absolute;
+  border: 1px solid ${cellArrayStructureColor};
+  border-radius: 3px;
+`;
+
 const CellOutline = styled("div")`
   position: absolute;
   border: 2px solid ${outlineColor};
@@ -503,6 +652,15 @@ const CellOutline = styled("div")`
   display: flex;
 `;
 
+const CellOutlineHandle = styled("div")`
+  position: absolute;
+  width: 5px;
+  height: 5px;
+  background: ${outlineColor};
+  cursor: crosshair;
+  border-radius: 1px;
+`;
+
 const ExtendToOutline = styled("div")`
   position: absolute;
   border: 1px dashed ${outlineColor};

webapp/IronCalc/src/components/Worksheet/usePointer.ts

@@ -20,6 +20,8 @@ interface PointerSettings {
   onAllSheetSelected: () => void;
   onAreaSelecting: (cell: Cell) => void;
   onAreaSelected: () => void;
+  onExtendToCell: (cell: Cell) => void;
+  onExtendToEnd: () => void;
   model: Model;
   workbookState: WorkbookState;
   refresh: () => void;
@@ -29,10 +31,12 @@ interface PointerEvents {
   onPointerDown: (event: PointerEvent) => void;
   onPointerMove: (event: PointerEvent) => void;
   onPointerUp: (event: PointerEvent) => void;
+  onPointerHandleDown: (event: PointerEvent) => void;
 }
 
 const usePointer = (options: PointerSettings): PointerEvents => {
   const isSelecting = useRef(false);
+  const isExtending = useRef(false);
   const isInsertingRef = useRef(false);
 
   const onPointerMove = useCallback(
@@ -43,7 +47,9 @@ const usePointer = (options: PointerSettings): PointerEvents => {
         return;
       }
 
-      if (!(isSelecting.current || isInsertingRef.current)) {
+      if (
+        !(isSelecting.current || isExtending.current || isInsertingRef.current)
+      ) {
         return;
       }
       const { canvasElement, model, worksheetCanvas } = options;
@@ -64,6 +70,8 @@ const usePointer = (options: PointerSettings): PointerEvents => {
 
       if (isSelecting.current) {
         options.onAreaSelecting(cell);
+      } else if (isExtending.current) {
+        options.onExtendToCell(cell);
       } else if (isInsertingRef.current) {
         const { refresh, workbookState } = options;
         const editingCell = workbookState.getEditingCell();
@@ -95,6 +103,11 @@ const usePointer = (options: PointerSettings): PointerEvents => {
         isSelecting.current = false;
         worksheetElement.current?.releasePointerCapture(event.pointerId);
         options.onAreaSelected();
+      } else if (isExtending.current) {
+        const { worksheetElement } = options;
+        isExtending.current = false;
+        worksheetElement.current?.releasePointerCapture(event.pointerId);
+        options.onExtendToEnd();
       } else if (isInsertingRef.current) {
         const { worksheetElement } = options;
         isInsertingRef.current = false;
@@ -107,14 +120,10 @@ const usePointer = (options: PointerSettings): PointerEvents => {
   const onPointerDown = useCallback(
     (event: PointerEvent) => {
       const target = event.target as HTMLElement;
-      if (target.className === "column-resize-handle") {
+      if (target !== null && target.className === "column-resize-handle") {
         // we are resizing a column
         return;
       }
-      if (target.className.includes("ironcalc-cell-handle")) {
-        // we are extending values
-        return;
-      }
       let x = event.clientX;
       let y = event.clientY;
       const {
@@ -227,25 +236,34 @@ const usePointer = (options: PointerSettings): PointerEvents => {
           );
           // we continue to select the new cell
         }
-        if (event.shiftKey) {
-          // We are extending the selection
-          options.onAreaSelecting(cell);
-          options.onAreaSelected();
-        } else {
-          // We are selecting a single cell
-          options.onCellSelected(cell, event);
-          isSelecting.current = true;
-          worksheetWrapper.setPointerCapture(event.pointerId);
-        }
+        options.onCellSelected(cell, event);
+        isSelecting.current = true;
+        worksheetWrapper.setPointerCapture(event.pointerId);
       }
     },
     [options],
   );
 
+  const onPointerHandleDown = useCallback(
+    (event: PointerEvent) => {
+      const worksheetWrapper = options.worksheetElement.current;
+      // Silence the linter
+      if (!worksheetWrapper) {
+        return;
+      }
+      isExtending.current = true;
+      worksheetWrapper.setPointerCapture(event.pointerId);
+      event.stopPropagation();
+      event.preventDefault();
+    },
+    [options],
+  );
+
   return {
     onPointerDown,
     onPointerMove,
     onPointerUp,
+    onPointerHandleDown,
   };
 };
 

webapp/IronCalc/src/components/WorksheetCanvas/constants.ts

@@ -13,6 +13,7 @@ export const defaultTextColor = "#2E414D";
 
 export const outlineColor = "#F2994A";
 export const outlineBackgroundColor = "#F2994A1A";
+export const cellArrayStructureColor = "#64BDFDA1";
 
 export const LAST_COLUMN = 16_384;
 export const LAST_ROW = 1_048_576;

webapp/IronCalc/src/components/WorksheetCanvas/outlineHandle.ts

@@ -1,211 +0,0 @@
-import { AreaType } from "../workbookState";
-import { LAST_COLUMN, LAST_ROW, outlineColor } from "./constants";
-import type WorksheetCanvas from "./worksheetCanvas";
-
-export function attachOutlineHandle(
-  worksheet: WorksheetCanvas,
-): HTMLDivElement {
-  // There is *always* a parent
-  const parent = worksheet.canvas.parentElement as HTMLDivElement;
-
-  // Remove any existing cell outline handles
-  for (const handle of parent.querySelectorAll(".ironcalc-cell-handle")) {
-    handle.remove();
-  }
-
-  // Create a new cell outline handle
-  const cellOutlineHandle = document.createElement("div");
-  cellOutlineHandle.className = "ironcalc-cell-handle";
-  parent.appendChild(cellOutlineHandle);
-  worksheet.cellOutlineHandle = cellOutlineHandle;
-
-  Object.assign(cellOutlineHandle.style, {
-    position: "absolute",
-    width: "5px",
-    height: "5px",
-    background: outlineColor,
-    cursor: "crosshair",
-    borderRadius: "1px",
-  });
-
-  // cell handle events
-  const resizeHandleMove = (event: MouseEvent): void => {
-    const canvasRect = worksheet.canvas.getBoundingClientRect();
-    const x = event.clientX - canvasRect.x;
-    const y = event.clientY - canvasRect.y;
-
-    const cell = worksheet.getCellByCoordinates(x, y);
-    if (!cell) {
-      return;
-    }
-    const { row, column } = cell;
-    const {
-      range: [rowStart, columnStart, rowEnd, columnEnd],
-    } = worksheet.model.getSelectedView();
-    // We are either extending by rows or by columns
-    // And we could be doing it in the positive direction (downwards or right)
-    // or the negative direction (upwards or left)
-
-    if (
-      row > rowEnd &&
-      ((column <= columnEnd && column >= columnStart) ||
-        (column < columnStart && columnStart - column < row - rowEnd) ||
-        (column > columnEnd && column - columnEnd < row - rowEnd))
-    ) {
-      // rows downwards
-      const area = {
-        type: AreaType.rowsDown,
-        rowStart: rowEnd + 1,
-        rowEnd: row,
-        columnStart,
-        columnEnd,
-      };
-      worksheet.workbookState.setExtendToArea(area);
-      worksheet.renderSheet();
-    } else if (
-      row < rowStart &&
-      ((column <= columnEnd && column >= columnStart) ||
-        (column < columnStart && columnStart - column < rowStart - row) ||
-        (column > columnEnd && column - columnEnd < rowStart - row))
-    ) {
-      // rows upwards
-      const area = {
-        type: AreaType.rowsUp,
-        rowStart: row,
-        rowEnd: rowStart,
-        columnStart,
-        columnEnd,
-      };
-      worksheet.workbookState.setExtendToArea(area);
-      worksheet.renderSheet();
-    } else if (
-      column > columnEnd &&
-      ((row <= rowEnd && row >= rowStart) ||
-        (row < rowStart && rowStart - row < column - columnEnd) ||
-        (row > rowEnd && row - rowEnd < column - columnEnd))
-    ) {
-      // columns right
-      const area = {
-        type: AreaType.columnsRight,
-        rowStart,
-        rowEnd,
-        columnStart: columnEnd + 1,
-        columnEnd: column,
-      };
-      worksheet.workbookState.setExtendToArea(area);
-      worksheet.renderSheet();
-    } else if (
-      column < columnStart &&
-      ((row <= rowEnd && row >= rowStart) ||
-        (row < rowStart && rowStart - row < columnStart - column) ||
-        (row > rowEnd && row - rowEnd < columnStart - column))
-    ) {
-      // columns left
-      const area = {
-        type: AreaType.columnsLeft,
-        rowStart,
-        rowEnd,
-        columnStart: column,
-        columnEnd: columnStart,
-      };
-      worksheet.workbookState.setExtendToArea(area);
-      worksheet.renderSheet();
-    }
-  };
-
-  const resizeHandleUp = (_event: MouseEvent): void => {
-    document.removeEventListener("pointermove", resizeHandleMove);
-    document.removeEventListener("pointerup", resizeHandleUp);
-
-    const { sheet, range } = worksheet.model.getSelectedView();
-    const extendedArea = worksheet.workbookState.getExtendToArea();
-    if (!extendedArea) {
-      return;
-    }
-    const rowStart = Math.min(range[0], range[2]);
-    const height = Math.abs(range[2] - range[0]) + 1;
-    const width = Math.abs(range[3] - range[1]) + 1;
-    const columnStart = Math.min(range[1], range[3]);
-
-    const area = {
-      sheet,
-      row: rowStart,
-      column: columnStart,
-      width,
-      height,
-    };
-
-    switch (extendedArea.type) {
-      case AreaType.rowsDown:
-        worksheet.model.autoFillRows(area, extendedArea.rowEnd);
-        break;
-      case AreaType.rowsUp: {
-        worksheet.model.autoFillRows(area, extendedArea.rowStart);
-        break;
-      }
-      case AreaType.columnsRight: {
-        worksheet.model.autoFillColumns(area, extendedArea.columnEnd);
-        break;
-      }
-      case AreaType.columnsLeft: {
-        worksheet.model.autoFillColumns(area, extendedArea.columnStart);
-        break;
-      }
-    }
-    worksheet.model.setSelectedRange(
-      Math.min(rowStart, extendedArea.rowStart),
-      Math.min(columnStart, extendedArea.columnStart),
-      Math.max(rowStart + height - 1, extendedArea.rowEnd),
-      Math.max(columnStart + width - 1, extendedArea.columnEnd),
-    );
-    worksheet.workbookState.clearExtendToArea();
-    worksheet.renderSheet();
-  };
-
-  cellOutlineHandle.addEventListener("pointerdown", () => {
-    document.addEventListener("pointermove", resizeHandleMove);
-    document.addEventListener("pointerup", resizeHandleUp);
-  });
-
-  cellOutlineHandle.addEventListener("dblclick", (event) => {
-    // On double-click, we will auto-fill the rows below the selected cell
-    const [sheet, row, column] = worksheet.model.getSelectedCell();
-    let lastUsedRow = row + 1;
-    let testColumn = column - 1;
-
-    // The "test column" is the column to the left of the selected cell or the next column if the left one is empty
-    if (
-      testColumn < 1 ||
-      worksheet.model.getFormattedCellValue(sheet, row, column - 1) === ""
-    ) {
-      testColumn = column + 1;
-      if (
-        testColumn > LAST_COLUMN ||
-        worksheet.model.getFormattedCellValue(sheet, row, testColumn) === ""
-      ) {
-        return;
-      }
-    }
-
-    // Find the last used row in the "test column"
-    for (let r = row + 1; r <= LAST_ROW; r += 1) {
-      if (worksheet.model.getFormattedCellValue(sheet, r, testColumn) === "") {
-        break;
-      }
-      lastUsedRow = r;
-    }
-
-    const area = {
-      sheet,
-      row: row,
-      column: column,
-      width: 1,
-      height: 1,
-    };
-
-    worksheet.model.autoFillRows(area, lastUsedRow);
-    event.stopPropagation();
-    worksheet.renderSheet();
-  });
-  return cellOutlineHandle;
-}

webapp/IronCalc/src/components/WorksheetCanvas/util.ts

@@ -1,63 +0,0 @@
-// Get a 10% transparency of an hex color
-export function hexToRGBA10Percent(colorHex: string): string {
-  // Remove the leading hash (#) if present
-  const hex = colorHex.replace(/^#/, "");
-
-  // Parse the hex color
-  const red = Number.parseInt(hex.substring(0, 2), 16);
-  const green = Number.parseInt(hex.substring(2, 4), 16);
-  const blue = Number.parseInt(hex.substring(4, 6), 16);
-
-  // Set the alpha (opacity) to 0.1 (10%)
-  const alpha = 0.1;
-
-  // Return the RGBA color string
-  return `rgba(${red}, ${green}, ${blue}, ${alpha})`;
-}
-
-/**
- * Splits the given text into multiple lines. If `wrapText` is true, it applies word-wrapping
- * based on the specified canvas context, maximum width, and horizontal padding.
- *
- * - First, the text is split by newline characters so that explicit newlines are respected.
- * - If wrapping is enabled, each line is further split into words and measured against the
- *   available width. Whenever adding an extra word would exceed
- *   this limit, a new line is started.
- *
- * @param text     The text to split into lines.
- * @param wrapText Whether to apply word-wrapping or just return text split by newlines.
- * @param context  The `CanvasRenderingContext2D` used for measuring text width.
- * @param width    The maximum width for each line.
- * @returns        An array of lines (strings), each fitting within the specified width if wrapping is enabled.
- */
-export function computeWrappedLines(
-  text: string,
-  wrapText: boolean,
-  context: CanvasRenderingContext2D,
-  width: number,
-): string[] {
-  // Split the text into lines
-  const rawLines = text.split("\n");
-  if (!wrapText) {
-    // If there is no wrapping, return the raw lines
-    return rawLines;
-  }
-  const wrappedLines = [];
-  for (const line of rawLines) {
-    const words = line.split(" ");
-    let currentLine = words[0];
-    for (let i = 1; i < words.length; i += 1) {
-      const word = words[i];
-      const testLine = `${currentLine} ${word}`;
-      const textWidth = context.measureText(testLine).width;
-      if (textWidth < width) {
-        currentLine = testLine;
-      } else {
-        wrappedLines.push(currentLine);
-        currentLine = word;
-      }
-    }
-    wrappedLines.push(currentLine);
-  }
-  return wrappedLines;
-}

webapp/IronCalc/src/components/WorksheetCanvas/worksheetCanvas.ts

@@ -18,8 +18,6 @@ import {
   headerTextColor,
   outlineColor,
 } from "./constants";
-import { attachOutlineHandle } from "./outlineHandle";
-import { computeWrappedLines, hexToRGBA10Percent } from "./util";
 
 export interface CanvasSettings {
   model: Model;
@@ -30,6 +28,8 @@ export interface CanvasSettings {
     canvas: HTMLCanvasElement;
     cellOutline: HTMLDivElement;
     areaOutline: HTMLDivElement;
+    cellOutlineHandle: HTMLDivElement;
+    cellArrayStructure: HTMLDivElement;
     extendToOutline: HTMLDivElement;
     columnGuide: HTMLDivElement;
     rowGuide: HTMLDivElement;
@@ -54,6 +54,70 @@ export const defaultCellFontFamily = fonts.regular;
 export const headerFontFamily = fonts.regular;
 export const frozenSeparatorWidth = 3;
 
+// Get a 10% transparency of an hex color
+function hexToRGBA10Percent(colorHex: string): string {
+  // Remove the leading hash (#) if present
+  const hex = colorHex.replace(/^#/, "");
+
+  // Parse the hex color
+  const red = Number.parseInt(hex.substring(0, 2), 16);
+  const green = Number.parseInt(hex.substring(2, 4), 16);
+  const blue = Number.parseInt(hex.substring(4, 6), 16);
+
+  // Set the alpha (opacity) to 0.1 (10%)
+  const alpha = 0.1;
+
+  // Return the RGBA color string
+  return `rgba(${red}, ${green}, ${blue}, ${alpha})`;
+}
+
+/**
+ * Splits the given text into multiple lines. If `wrapText` is true, it applies word-wrapping
+ * based on the specified canvas context, maximum width, and horizontal padding.
+ *
+ * - First, the text is split by newline characters so that explicit newlines are respected.
+ * - If wrapping is enabled, each line is further split into words and measured against the
+ *   available width. Whenever adding an extra word would exceed
+ *   this limit, a new line is started.
+ *
+ * @param text     The text to split into lines.
+ * @param wrapText Whether to apply word-wrapping or just return text split by newlines.
+ * @param context  The `CanvasRenderingContext2D` used for measuring text width.
+ * @param width    The maximum width for each line.
+ * @returns        An array of lines (strings), each fitting within the specified width if wrapping is enabled.
+ */
+function computeWrappedLines(
+  text: string,
+  wrapText: boolean,
+  context: CanvasRenderingContext2D,
+  width: number,
+): string[] {
+  // Split the text into lines
+  const rawLines = text.split("\n");
+  if (!wrapText) {
+    // If there is no wrapping, return the raw lines
+    return rawLines;
+  }
+  const wrappedLines = [];
+  for (const line of rawLines) {
+    const words = line.split(" ");
+    let currentLine = words[0];
+    for (let i = 1; i < words.length; i += 1) {
+      const word = words[i];
+      const testLine = `${currentLine} ${word}`;
+      const textWidth = context.measureText(testLine).width;
+      if (textWidth < width) {
+        currentLine = testLine;
+      } else {
+        wrappedLines.push(currentLine);
+        currentLine = word;
+      }
+    }
+    wrappedLines.push(currentLine);
+  }
+  return wrappedLines;
+}
+
 export default class WorksheetCanvas {
   sheetWidth: number;
 
@@ -75,6 +139,8 @@ export default class WorksheetCanvas {
 
   cellOutlineHandle: HTMLDivElement;
 
+  cellArrayStructure: HTMLDivElement;
+
   extendToOutline: HTMLDivElement;
 
   workbookState: WorkbookState;
@@ -106,6 +172,8 @@ export default class WorksheetCanvas {
     this.refresh = options.refresh;
 
     this.cellOutline = options.elements.cellOutline;
+    this.cellOutlineHandle = options.elements.cellOutlineHandle;
+    this.cellArrayStructure = options.elements.cellArrayStructure;
     this.areaOutline = options.elements.areaOutline;
     this.extendToOutline = options.elements.extendToOutline;
     this.rowGuide = options.elements.rowGuide;
@@ -115,7 +183,6 @@ export default class WorksheetCanvas {
     this.onColumnWidthChanges = options.onColumnWidthChanges;
     this.onRowHeightChanges = options.onRowHeightChanges;
     this.resetHeaders();
-    this.cellOutlineHandle = attachOutlineHandle(this);
   }
 
   setScrollPosition(scrollPosition: { left: number; top: number }): void {
@@ -1182,16 +1249,20 @@ export default class WorksheetCanvas {
   }
 
   private drawCellOutline(): void {
-    const { cellOutline, areaOutline, cellOutlineHandle } = this;
+    const { cellArrayStructure, cellOutline, areaOutline, cellOutlineHandle } =
+      this;
     if (this.workbookState.getEditingCell()) {
       cellOutline.style.visibility = "hidden";
       cellOutlineHandle.style.visibility = "hidden";
       areaOutline.style.visibility = "hidden";
+      cellArrayStructure.style.visibility = "hidden";
       return;
     }
     cellOutline.style.visibility = "visible";
     cellOutlineHandle.style.visibility = "visible";
     areaOutline.style.visibility = "visible";
+    // This one is hidden by default
+    cellArrayStructure.style.visibility = "hidden";
 
     const [selectedSheet, selectedRow, selectedColumn] =
       this.model.getSelectedCell();
@@ -1247,6 +1318,34 @@ export default class WorksheetCanvas {
       [handleX, handleY] = this.getCoordinatesByCell(rowStart, columnStart);
       handleX += this.getColumnWidth(selectedSheet, columnStart);
       handleY += this.getRowHeight(selectedSheet, rowStart);
+      // we draw the array structure if needed only in this case
+      const arrayStructure = this.model.getCellArrayStructure(
+        selectedSheet,
+        selectedRow,
+        selectedColumn,
+      );
+      let array = null;
+      if (arrayStructure === "SingleCell") {
+        // nothing to see here
+      } else if ("DynamicMother" in arrayStructure) {
+        cellArrayStructure.style.visibility = "visible";
+        const [arrayWidth, arrayHeight] = arrayStructure.DynamicMother;
+        array = [selectedRow, selectedColumn, arrayWidth, arrayHeight];
+      } else {
+        cellArrayStructure.style.visibility = "visible";
+        array = arrayStructure.DynamicChild;
+      }
+      if (array !== null) {
+        const [arrayX, arrayY] = this.getCoordinatesByCell(array[0], array[1]);
+        const [arrayX1, arrayY1] = this.getCoordinatesByCell(
+          array[0] + array[3],
+          array[1] + array[2],
+        );
+        cellArrayStructure.style.left = `${arrayX}px`;
+        cellArrayStructure.style.top = `${arrayY}px`;
+        cellArrayStructure.style.width = `${arrayX1 - arrayX}px`;
+        cellArrayStructure.style.height = `${arrayY1 - arrayY}px`;
+      }
     } else {
       areaOutline.style.visibility = "visible";
       cellOutlineHandle.style.visibility = "visible";

webapp/IronCalc/src/icons/index.ts

@@ -19,7 +19,6 @@ import InsertColumnLeftIcon from "./insert-column-left.svg?react";
 import InsertColumnRightIcon from "./insert-column-right.svg?react";
 import InsertRowAboveIcon from "./insert-row-above.svg?react";
 import InsertRowBelow from "./insert-row-below.svg?react";
-import Markdown from "./markdown.svg?react";
 
 import IronCalcIcon from "./ironcalc_icon.svg?react";
 import IronCalcLogo from "./orange+black.svg?react";
@@ -49,5 +48,4 @@ export {
   IronCalcIcon,
   IronCalcLogo,
   Fx,
-  Markdown,
 };

webapp/IronCalc/src/icons/markdown.svg

@@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-
-<!-- Uploaded to: SVG Repo, www.svgrepo.com, Generator: SVG Repo Mixer Tools -->
-<svg width="800px" height="800px" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
-    <g>
-        <path fill="none" d="M0 0h24v24H0z"/>
-        <path fill-rule="nonzero" d="M3 3h18a1 1 0 0 1 1 1v16a1 1 0 0 1-1 1H3a1 1 0 0 1-1-1V4a1 1 0 0 1 1-1zm1 2v14h16V5H4zm3 10.5H5v-7h2l2 2 2-2h2v7h-2v-4l-2 2-2-2v4zm11-3h2l-3 3-3-3h2v-4h2v4z"/>
-    </g>

webapp/IronCalc/src/locale/en_us.json

@@ -26,7 +26,6 @@
     "vertical_align_middle": " Align middle",
     "vertical_align_top": "Align top",
     "selected_png": "Export Selected area as PNG",
-    "selected_markdown": "Export Selected area as Markdown",
     "wrap_text": "Wrap text",
     "format_menu": {
       "auto": "Auto",

webapp/app.ironcalc.com/frontend/package.json

@@ -14,19 +14,19 @@
     "@emotion/react": "^11.14.0",
     "@emotion/styled": "^11.14.0",
     "@ironcalc/workbook": "file:../../IronCalc/",
-    "@mui/material": "^7.1.1",
-    "lucide-react": "^0.513.0",
+    "@mui/material": "^6.4",
+    "lucide-react": "^0.473.0",
     "qrcode.react": "^4.2.0",
-    "react": "^19.1.0",
-    "react-dom": "^19.1.0"
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0"
   },
   "devDependencies": {
     "@biomejs/biome": "1.9.4",
-    "@types/react": "^19.1.0",
-    "@types/react-dom": "^19.1.0",
+    "@types/react": "^19.0.0",
+    "@types/react-dom": "^19.0.0",
     "@vitejs/plugin-react": "^4.3.4",
-    "typescript": "~5.8.3",
-    "vite": "^6.3.5",
+    "typescript": "~5.6.2",
+    "vite": "^6.0.5",
     "vite-plugin-svgr": "^4.2.0"
   }
 }

xlsx/src/export/worksheets.rs

@@ -22,7 +22,7 @@ use itertools::Itertools;
 
 use ironcalc_base::{
     expressions::{
-        parser::{stringify::to_excel_string, Node},
+        parser::{static_analysis::StaticResult, stringify::to_excel_string, Node},
         types::CellReferenceRC,
         utils::number_to_column,
     },
@@ -56,7 +56,7 @@ fn get_formula_attribute(
 
 pub(crate) fn get_worksheet_xml(
     worksheet: &Worksheet,
-    parsed_formulas: &[Node],
+    parsed_formulas: &[(Node, StaticResult)],
     dimension: &str,
     is_sheet_selected: bool,
 ) -> String {
@@ -104,7 +104,7 @@ pub(crate) fn get_worksheet_xml(
                     let style = get_cell_style_attribute(*s);
                     row_data_str.push(format!("<c r=\"{cell_name}\"{style}/>"));
                 }
-                Cell::BooleanCell { v, s } => {
+                Cell::SpillBooleanCell { v, s, .. } | Cell::BooleanCell { v, s } => {
                     // <c r="A8" t="b" s="1">
                     //     <v>1</v>
                     // </c>
@@ -114,7 +114,7 @@ pub(crate) fn get_worksheet_xml(
                         "<c r=\"{cell_name}\" t=\"b\"{style}><v>{b}</v></c>"
                     ));
                 }
-                Cell::NumberCell { v, s } => {
+                Cell::SpillNumberCell { v, s, .. } | Cell::NumberCell { v, s } => {
                     // Normally the type number is left out. Example:
                     // <c r="C6" s="1">
                     //     <v>3</v>
@@ -122,7 +122,7 @@ pub(crate) fn get_worksheet_xml(
                     let style = get_cell_style_attribute(*s);
                     row_data_str.push(format!("<c r=\"{cell_name}\"{style}><v>{v}</v></c>"));
                 }
-                Cell::ErrorCell { ei, s } => {
+                Cell::SpillErrorCell { ei, s, .. } | Cell::ErrorCell { ei, s } => {
                     let style = get_cell_style_attribute(*s);
                     row_data_str.push(format!(
                         "<c r=\"{cell_name}\" t=\"e\"{style}><v>{ei}</v></c>"
@@ -153,7 +153,7 @@ pub(crate) fn get_worksheet_xml(
                         worksheet.get_name(),
                         *row_index,
                         *column_index,
-                        &parsed_formulas[*f as usize],
+                        &parsed_formulas[*f as usize].0,
                     );
 
                     let b = i32::from(*v);
@@ -172,7 +172,7 @@ pub(crate) fn get_worksheet_xml(
                         worksheet.get_name(),
                         *row_index,
                         *column_index,
-                        &parsed_formulas[*f as usize],
+                        &parsed_formulas[*f as usize].0,
                     );
                     let style = get_cell_style_attribute(*s);
 
@@ -189,14 +189,14 @@ pub(crate) fn get_worksheet_xml(
                         worksheet.get_name(),
                         *row_index,
                         *column_index,
-                        &parsed_formulas[*f as usize],
+                        &parsed_formulas[*f as usize].0,
                     );
                     let style = get_cell_style_attribute(*s);
                     let escaped_v = escape_xml(v);
 
                     row_data_str.push(format!(
-                        "<c r=\"{cell_name}\" t=\"str\"{style}><f>{formula}</f><v>{escaped_v}</v></c>"
-                    ));
+                                    "<c r=\"{cell_name}\" t=\"str\"{style}><f>{formula}</f><v>{escaped_v}</v></c>"
+                                ));
                 }
                 Cell::CellFormulaError {
                     f,
@@ -213,13 +213,135 @@ pub(crate) fn get_worksheet_xml(
                         worksheet.get_name(),
                         *row_index,
                         *column_index,
-                        &parsed_formulas[*f as usize],
+                        &parsed_formulas[*f as usize].0,
                     );
                     let style = get_cell_style_attribute(*s);
                     row_data_str.push(format!(
                         "<c r=\"{cell_name}\" t=\"e\"{style}><f>{formula}</f><v>{ei}</v></c>"
                     ));
                 }
+                Cell::SpillStringCell { v, s, .. } => {
+                    // inline string
+                    // <c r="A1" t="str">
+                    let style = get_cell_style_attribute(*s);
+                    let escaped_v = escape_xml(v);
+                    row_data_str.push(format!(
+                        "<c r=\"{cell_name}\" t=\"str\"{style}><v>{escaped_v}</v></c>"
+                    ));
+                }
+                Cell::DynamicCellFormula { .. } => {
+                    panic!("Model needs to be evaluated before saving!");
+                }
+                Cell::DynamicCellFormulaBoolean { f, v, s, r, a: _ } => {
+                    // <c r="A1" s="3" cm="1">
+                    //   <f t="array" ref="A1:A10">A1:A10</f>
+                    //   <v>1</v>
+                    // </c>
+                    let style = get_cell_style_attribute(*s);
+                    let range = format!(
+                        "{}{}:{}{}",
+                        column_name,
+                        row_index,
+                        number_to_column(r.0 + column_index).unwrap(),
+                        r.1 + row_index
+                    );
+
+                    let formula = get_formula_attribute(
+                        worksheet.get_name(),
+                        *row_index,
+                        *column_index,
+                        &parsed_formulas[*f as usize].0,
+                    );
+
+                    let b = i32::from(*v);
+                    row_data_str.push(format!(
+                        r#"<c r="{cell_name}" t="b" s="{style}" cm="1"><f t="array" ref="{range}">{formula}</f><v>{b}</v></c>"#
+                    ));
+                }
+                Cell::DynamicCellFormulaNumber { f, v, s, r, a: _ } => {
+                    // <c r="C4" s="3" cm="1">
+                    //   <f t="array" ref="C4:C10">C4:C10</f>
+                    //   <v>123</v>
+                    // </c>
+                    let style = get_cell_style_attribute(*s);
+                    let range = format!(
+                        "{}{}:{}{}",
+                        column_name,
+                        row_index,
+                        number_to_column(r.0 + column_index).unwrap(),
+                        r.1 + row_index
+                    );
+
+                    let formula = get_formula_attribute(
+                        worksheet.get_name(),
+                        *row_index,
+                        *column_index,
+                        &parsed_formulas[*f as usize].0,
+                    );
+
+                    row_data_str.push(format!(
+                        r#"<c r="{cell_name}" s="{style}" cm="1"><f t="array" ref="{range}">{formula}</f><v>{v}</v></c>"#
+                    ));
+                }
+                Cell::DynamicCellFormulaString { f, v, s, r, a: _ } => {
+                    // <c r="C6" t="str" s="5" cm="1">
+                    //   <f t="array" ref="C6:C10">C6:C10</f>
+                    //   <v>Hello world!</v>
+                    // </c>
+                    let style = get_cell_style_attribute(*s);
+                    let range = format!(
+                        "{}{}:{}{}",
+                        column_name,
+                        row_index,
+                        number_to_column(r.0 + column_index).unwrap(),
+                        r.1 + row_index
+                    );
+
+                    let formula = get_formula_attribute(
+                        worksheet.get_name(),
+                        *row_index,
+                        *column_index,
+                        &parsed_formulas[*f as usize].0,
+                    );
+                    let escaped_v = escape_xml(v);
+
+                    row_data_str.push(format!(
+                                    r#"<c r="{cell_name}" t="str" s="{style}" cm="1"><f t="array" ref="{range}">{formula}</f><v>{escaped_v}</v></c>"#
+                                ));
+                }
+                Cell::DynamicCellFormulaError {
+                    f,
+                    ei,
+                    s,
+                    o: _,
+                    m: _,
+                    r,
+                    a: _,
+                } => {
+                    // <c r="C6" t="e" s="4" cm="1">
+                    //   <f t="array" ref="C6:C10">C6:C10</f>
+                    //   <v>#DIV/0!</v>
+                    // </c>
+                    let style = get_cell_style_attribute(*s);
+                    let range = format!(
+                        "{}{}:{}{}",
+                        column_name,
+                        row_index,
+                        number_to_column(r.0 + column_index).unwrap(),
+                        r.1 + row_index
+                    );
+
+                    let formula = get_formula_attribute(
+                        worksheet.get_name(),
+                        *row_index,
+                        *column_index,
+                        &parsed_formulas[*f as usize].0,
+                    );
+
+                    row_data_str.push(format!(
+                        r#"<c r="{cell_name}" t="e" s="{style}" cm="1"><f t="array" ref="{range}">{formula}</f><v>{ei}</v></c>"#
+                    ));
+                }
             }
         }
         let row_style_str = match row_style_dict.get(row_index) {

xlsx/src/import/worksheets.rs

@@ -306,13 +306,15 @@ fn from_a1_to_rc(
     context: String,
     tables: HashMap<String, Table>,
     defined_names: Vec<DefinedNameS>,
+    is_array: bool,
 ) -> Result<String, XlsxError> {
     let mut parser = Parser::new(worksheets.to_owned(), defined_names, tables);
     let cell_reference =
         parse_reference(&context).map_err(|error| XlsxError::Xml(error.to_string()))?;
     let mut t = parser.parse(&formula, &cell_reference);
-    add_implicit_intersection(&mut t, true);
-
+    if !is_array {
+        add_implicit_intersection(&mut t, true);
+    }
     Ok(to_rc_format(&t))
 }
 
@@ -827,6 +829,7 @@ pub(super) fn load_sheet<R: Read + std::io::Seek>(
             };
 
             let cell_metadata = cell.attribute("cm");
+            let is_dynamic_array = cell_metadata == Some("1");
 
             // type, the default type being "n" for number
             // If the cell does not have a value is an empty cell
@@ -893,6 +896,7 @@ pub(super) fn load_sheet<R: Read + std::io::Seek>(
                                     context,
                                     tables.clone(),
                                     defined_names.clone(),
+                                    is_dynamic_array,
                                 )?;
                                 match index_map.get(&si) {
                                     Some(index) => {
@@ -941,7 +945,6 @@ pub(super) fn load_sheet<R: Read + std::io::Seek>(
                         return Err(XlsxError::NotImplemented("data table formulas".to_string()));
                     }
                     "array" | "normal" => {
-                        let is_dynamic_array = cell_metadata == Some("1");
                         if formula_type == "array" && !is_dynamic_array {
                             // Dynamic formulas in Excel are formulas of type array with the cm=1, those we support.
                             // On the other hand the old CSE formulas or array formulas are not supported in IronCalc for the time being
@@ -956,6 +959,7 @@ pub(super) fn load_sheet<R: Read + std::io::Seek>(
                             context,
                             tables.clone(),
                             defined_names.clone(),
+                            is_dynamic_array,
                         )?;
 
                         match get_formula_index(&formula, &shared_formulas) {