From 68a33a5f87dfcdd9a98f00445866a058b46e7e55 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nicol=C3=A1s=20Hatcher=20Andr=C3=A9s?=
 <nicolas@theuniverse.today>
Date: Tue, 4 Nov 2025 22:16:16 +0100
Subject: [PATCH] UPDATE: Adds COMBIN, COMBINA and SUMSQ (#511)

---
 .../src/expressions/parser/static_analysis.rs |   6 +
 base/src/functions/mathematical.rs            | 158 ++++++++++++++++++
 base/src/functions/mod.rs                     |  18 +-
 xlsx/tests/calc_tests/COMBIN_COMBINA.xlsx     | Bin 0 -> 9602 bytes
 xlsx/tests/calc_tests/SUMSQ.xlsx              | Bin 0 -> 8634 bytes
 5 files changed, 181 insertions(+), 1 deletion(-)
 create mode 100644 xlsx/tests/calc_tests/COMBIN_COMBINA.xlsx
 create mode 100644 xlsx/tests/calc_tests/SUMSQ.xlsx

diff --git a/base/src/expressions/parser/static_analysis.rs b/base/src/expressions/parser/static_analysis.rs
index e7402f4..e4f64e2 100644
--- a/base/src/expressions/parser/static_analysis.rs
+++ b/base/src/expressions/parser/static_analysis.rs
@@ -868,6 +868,9 @@ fn get_function_args_signature(kind: &Function, arg_count: usize) -> Vec<Signatu
         Function::Decimal => args_signature_scalars(arg_count, 2, 0),
         Function::Roman => args_signature_scalars(arg_count, 1, 1),
         Function::Arabic => args_signature_scalars(arg_count, 1, 0),
+        Function::Combin => args_signature_scalars(arg_count, 2, 0),
+        Function::Combina => args_signature_scalars(arg_count, 2, 0),
+        Function::Sumsq => vec![Signature::Vector; arg_count],
     }
 }
 
@@ -1124,5 +1127,8 @@ fn static_analysis_on_function(kind: &Function, args: &[Node]) -> StaticResult {
         Function::Decimal => scalar_arguments(args),
         Function::Roman => scalar_arguments(args),
         Function::Arabic => scalar_arguments(args),
+        Function::Combin => scalar_arguments(args),
+        Function::Combina => scalar_arguments(args),
+        Function::Sumsq => StaticResult::Scalar,
     }
 }
diff --git a/base/src/functions/mathematical.rs b/base/src/functions/mathematical.rs
index 1333a11..22a16e5 100644
--- a/base/src/functions/mathematical.rs
+++ b/base/src/functions/mathematical.rs
@@ -633,6 +633,101 @@ impl Model {
         CalcResult::Number(result)
     }
 
+    pub(crate) fn fn_sumsq(&mut self, args: &[Node], cell: CellReferenceIndex) -> CalcResult {
+        if args.is_empty() {
+            return CalcResult::new_args_number_error(cell);
+        }
+
+        let mut result = 0.0;
+        for arg in args {
+            match self.evaluate_node_in_context(arg, cell) {
+                CalcResult::Number(value) => result += value * value,
+                CalcResult::Range { left, right } => {
+                    if left.sheet != right.sheet {
+                        return CalcResult::new_error(
+                            Error::VALUE,
+                            cell,
+                            "Ranges are in different sheets".to_string(),
+                        );
+                    }
+                    // TODO: We should do this for all functions that run through ranges
+                    // Running cargo test for the ironcalc takes around .8 seconds with this speedup
+                    // and ~ 3.5 seconds without it. Note that once properly in place sheet.dimension should be almost a noop
+                    let row1 = left.row;
+                    let mut row2 = right.row;
+                    let column1 = left.column;
+                    let mut column2 = right.column;
+                    if row1 == 1 && row2 == LAST_ROW {
+                        row2 = match self.workbook.worksheet(left.sheet) {
+                            Ok(s) => s.dimension().max_row,
+                            Err(_) => {
+                                return CalcResult::new_error(
+                                    Error::ERROR,
+                                    cell,
+                                    format!("Invalid worksheet index: '{}'", left.sheet),
+                                );
+                            }
+                        };
+                    }
+                    if column1 == 1 && column2 == LAST_COLUMN {
+                        column2 = match self.workbook.worksheet(left.sheet) {
+                            Ok(s) => s.dimension().max_column,
+                            Err(_) => {
+                                return CalcResult::new_error(
+                                    Error::ERROR,
+                                    cell,
+                                    format!("Invalid worksheet index: '{}'", left.sheet),
+                                );
+                            }
+                        };
+                    }
+                    for row in row1..row2 + 1 {
+                        for column in column1..(column2 + 1) {
+                            match self.evaluate_cell(CellReferenceIndex {
+                                sheet: left.sheet,
+                                row,
+                                column,
+                            }) {
+                                CalcResult::Number(value) => {
+                                    result += value * value;
+                                }
+                                error @ CalcResult::Error { .. } => return error,
+                                _ => {
+                                    // We ignore booleans and strings
+                                }
+                            }
+                        }
+                    }
+                }
+                CalcResult::Array(array) => {
+                    for row in array {
+                        for value in row {
+                            match value {
+                                ArrayNode::Number(value) => {
+                                    result += value * value;
+                                }
+                                ArrayNode::Error(error) => {
+                                    return CalcResult::Error {
+                                        error,
+                                        origin: cell,
+                                        message: "Error in array".to_string(),
+                                    }
+                                }
+                                _ => {
+                                    // We ignore booleans and strings
+                                }
+                            }
+                        }
+                    }
+                }
+                error @ CalcResult::Error { .. } => return error,
+                _ => {
+                    // We ignore booleans and strings
+                }
+            };
+        }
+        CalcResult::Number(result)
+    }
     pub(crate) fn fn_product(&mut self, args: &[Node], cell: CellReferenceIndex) -> CalcResult {
         if args.is_empty() {
             return CalcResult::new_args_number_error(cell);
@@ -1465,4 +1560,67 @@ impl Model {
             },
         }
     }
+
+    pub(crate) fn fn_combin(&mut self, args: &[Node], cell: CellReferenceIndex) -> CalcResult {
+        if args.len() != 2 {
+            return CalcResult::new_args_number_error(cell);
+        }
+        let n = match self.get_number(&args[0], cell) {
+            Ok(f) => f.floor(),
+            Err(s) => return s,
+        };
+        let k = match self.get_number(&args[1], cell) {
+            Ok(f) => f.floor(),
+            Err(s) => return s,
+        };
+        if n < 0.0 || k < 0.0 {
+            return CalcResult::Error {
+                error: Error::NUM,
+                origin: cell,
+                message: "Arguments must be non-negative integers".to_string(),
+            };
+        }
+        if k > n {
+            return CalcResult::Error {
+                error: Error::NUM,
+                origin: cell,
+                message: "k cannot be greater than n".to_string(),
+            };
+        }
+        let k = k as usize;
+        let mut result = 1.0;
+        for i in 0..k {
+            let t = i as f64;
+            result *= (n - t) / (t + 1.0);
+        }
+        CalcResult::Number(result)
+    }
+
+    pub(crate) fn fn_combina(&mut self, args: &[Node], cell: CellReferenceIndex) -> CalcResult {
+        if args.len() != 2 {
+            return CalcResult::new_args_number_error(cell);
+        }
+        let n = match self.get_number(&args[0], cell) {
+            Ok(f) => f.floor(),
+            Err(s) => return s,
+        };
+        let k = match self.get_number(&args[1], cell) {
+            Ok(f) => f.floor(),
+            Err(s) => return s,
+        };
+        if n < 0.0 || k < 0.0 || (n == 0.0 && k > 0.0) {
+            return CalcResult::Error {
+                error: Error::NUM,
+                origin: cell,
+                message: "Arguments must be non-negative integers".to_string(),
+            };
+        }
+        let k = k as usize;
+        let mut result = 1.0;
+        for i in 0..k {
+            let t = i as f64;
+            result *= (n + t) / (t + 1.0);
+        }
+        CalcResult::Number(result)
+    }
 }
diff --git a/base/src/functions/mod.rs b/base/src/functions/mod.rs
index 3b4bc50..5e994e0 100644
--- a/base/src/functions/mod.rs
+++ b/base/src/functions/mod.rs
@@ -111,6 +111,9 @@ pub enum Function {
     Decimal,
     Roman,
     Arabic,
+    Combin,
+    Combina,
+    Sumsq,
 
     // Information
     ErrorType,
@@ -305,7 +308,7 @@ pub enum Function {
 }
 
 impl Function {
-    pub fn into_iter() -> IntoIter<Function, 249> {
+    pub fn into_iter() -> IntoIter<Function, 252> {
         [
             Function::And,
             Function::False,
@@ -556,6 +559,9 @@ impl Function {
             Function::Subtotal,
             Function::Roman,
             Function::Arabic,
+            Function::Combin,
+            Function::Combina,
+            Function::Sumsq,
         ]
         .into_iter()
     }
@@ -607,6 +613,7 @@ impl Function {
             Function::Base => "_xlfn.BASE".to_string(),
             Function::Decimal => "_xlfn.DECIMAL".to_string(),
             Function::Arabic => "_xlfn.ARABIC".to_string(),
+            Function::Combina => "_xlfn.COMBINA".to_string(),
 
             _ => self.to_string(),
         }
@@ -696,6 +703,9 @@ impl Function {
             "SUM" => Some(Function::Sum),
             "SUMIF" => Some(Function::Sumif),
             "SUMIFS" => Some(Function::Sumifs),
+            "COMBIN" => Some(Function::Combin),
+            "COMBINA" | "_XLFN.COMBINA" => Some(Function::Combina),
+            "SUMSQ" => Some(Function::Sumsq),
 
             // Lookup and Reference
             "CHOOSE" => Some(Function::Choose),
@@ -1141,6 +1151,9 @@ impl fmt::Display for Function {
             Function::Decimal => write!(f, "DECIMAL"),
             Function::Roman => write!(f, "ROMAN"),
             Function::Arabic => write!(f, "ARABIC"),
+            Function::Combin => write!(f, "COMBIN"),
+            Function::Combina => write!(f, "COMBINA"),
+            Function::Sumsq => write!(f, "SUMSQ"),
         }
     }
 }
@@ -1418,6 +1431,9 @@ impl Model {
             Function::Decimal => self.fn_decimal(args, cell),
             Function::Roman => self.fn_roman(args, cell),
             Function::Arabic => self.fn_arabic(args, cell),
+            Function::Combin => self.fn_combin(args, cell),
+            Function::Combina => self.fn_combina(args, cell),
+            Function::Sumsq => self.fn_sumsq(args, cell),
         }
     }
 }
diff --git a/xlsx/tests/calc_tests/COMBIN_COMBINA.xlsx b/xlsx/tests/calc_tests/COMBIN_COMBINA.xlsx
new file mode 100644
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