Error Handling of public Set functions (#88)

What are we trying to achieve ?

++ Currently all the major public set functions is panic prone and does not handle and return error. This PR tries to address to all those functions.

What major errors that could happen in these functions ?

++ All the functions which are being made as error safe is being tested against invalid sheet, row and column values, which could given by user

What are the list of functions whose return type has been altered ?

**base/src/model.rs**
1. update_cell_with_text
2. update_cell_with_bool
3. update_cell_with_number
4. set_user_input
5. get_cell_style_index
6. get_style_for_cell
7. set_cell_with_string

++> New functions being added

1. set_cell_with_boolean
2. set_cell_with_number

**base/src/styles.rs**

1. get_style_with_quote_prefix
3. get_style_with_format
4. get_style_without_quote_prefix
5. get_style

**base/src/worksheet.rs**

1. update_cell
2. set_cell_style
3. set_cell_with_formula
4. set_cell_with_number
6. set_cell_with_string
8. set_cell_with_boolean
9. set_cell_with_error
10. cell_clear_contents
11. cell_clear_contents_with_style

++> Above is the comprehensive list of all functions being ( most are public, some are private ) altered for better error handling. As a side effect of changing function signature, there are many changes being done to other functions ( mostly adding "?" to enable to error propagation further )

xlsx/tests/test.rs

@@ -158,42 +158,42 @@ fn test_split() {
 
 fn test_model_has_correct_styles(model: &Model) {
     // A1 is bold
-    let style_a1 = model.get_style_for_cell(0, 1, 1);
+    let style_a1 = model.get_style_for_cell(0, 1, 1).unwrap();
     assert!(style_a1.font.b);
     assert!(!style_a1.font.i);
     assert!(!style_a1.font.u);
 
     // B1 is Italics
-    let style_b1 = model.get_style_for_cell(0, 1, 2);
+    let style_b1 = model.get_style_for_cell(0, 1, 2).unwrap();
     assert!(style_b1.font.i);
     assert!(!style_b1.font.b);
     assert!(!style_b1.font.u);
 
     // C1 Underlined
-    let style_c1 = model.get_style_for_cell(0, 1, 3);
+    let style_c1 = model.get_style_for_cell(0, 1, 3).unwrap();
     assert!(style_c1.font.u);
     assert!(!style_c1.font.b);
     assert!(!style_c1.font.i);
 
     // D1 Bold and Italics
-    let style_d1 = model.get_style_for_cell(0, 1, 4);
+    let style_d1 = model.get_style_for_cell(0, 1, 4).unwrap();
     assert!(style_d1.font.b);
     assert!(style_d1.font.i);
     assert!(!style_d1.font.u);
 
     // E1 Bold, italics and underlined
-    let style_e1 = model.get_style_for_cell(0, 1, 5);
+    let style_e1 = model.get_style_for_cell(0, 1, 5).unwrap();
     assert!(style_e1.font.b);
     assert!(style_e1.font.i);
     assert!(style_e1.font.u);
     assert!(!style_e1.font.strike);
 
     // F1 strikethrough
-    let style_f1 = model.get_style_for_cell(0, 1, 6);
+    let style_f1 = model.get_style_for_cell(0, 1, 6).unwrap();
     assert!(style_f1.font.strike);
 
     // G1 Double underlined just get simple underlined
-    let style_g1 = model.get_style_for_cell(0, 1, 7);
+    let style_g1 = model.get_style_for_cell(0, 1, 7).unwrap();
     assert!(style_g1.font.u);
 
     let height_row_3 = model.workbook.worksheet(0).unwrap().row_height(3).unwrap();
@@ -204,44 +204,84 @@ fn test_model_has_correct_styles(model: &Model) {
 
     // Second sheet has alignment
     // Horizontal
-    let alignment = model.get_style_for_cell(1, 2, 1).alignment;
+    let alignment = model.get_style_for_cell(1, 2, 1).unwrap().alignment;
     assert_eq!(alignment, None);
 
-    let alignment = model.get_style_for_cell(1, 3, 1).alignment.unwrap();
+    let alignment = model
+        .get_style_for_cell(1, 3, 1)
+        .unwrap()
+        .alignment
+        .unwrap();
     assert_eq!(alignment.horizontal, HorizontalAlignment::Left);
 
-    let alignment = model.get_style_for_cell(1, 4, 1).alignment.unwrap();
+    let alignment = model
+        .get_style_for_cell(1, 4, 1)
+        .unwrap()
+        .alignment
+        .unwrap();
     assert_eq!(alignment.horizontal, HorizontalAlignment::Distributed);
 
-    let alignment = model.get_style_for_cell(1, 5, 1).alignment.unwrap();
+    let alignment = model
+        .get_style_for_cell(1, 5, 1)
+        .unwrap()
+        .alignment
+        .unwrap();
     assert_eq!(alignment.horizontal, HorizontalAlignment::Right);
 
-    let alignment = model.get_style_for_cell(1, 6, 1).alignment.unwrap();
+    let alignment = model
+        .get_style_for_cell(1, 6, 1)
+        .unwrap()
+        .alignment
+        .unwrap();
     assert_eq!(alignment.horizontal, HorizontalAlignment::Center);
 
-    let alignment = model.get_style_for_cell(1, 7, 1).alignment.unwrap();
+    let alignment = model
+        .get_style_for_cell(1, 7, 1)
+        .unwrap()
+        .alignment
+        .unwrap();
     assert_eq!(alignment.horizontal, HorizontalAlignment::Fill);
 
-    let alignment = model.get_style_for_cell(1, 8, 1).alignment.unwrap();
+    let alignment = model
+        .get_style_for_cell(1, 8, 1)
+        .unwrap()
+        .alignment
+        .unwrap();
     assert_eq!(alignment.horizontal, HorizontalAlignment::Justify);
 
     // Vertical
-    let alignment = model.get_style_for_cell(1, 2, 2).alignment;
+    let alignment = model.get_style_for_cell(1, 2, 2).unwrap().alignment;
     assert_eq!(alignment, None);
 
-    let alignment = model.get_style_for_cell(1, 3, 2).alignment;
+    let alignment = model.get_style_for_cell(1, 3, 2).unwrap().alignment;
     assert_eq!(alignment, None);
 
-    let alignment = model.get_style_for_cell(1, 4, 2).alignment.unwrap();
+    let alignment = model
+        .get_style_for_cell(1, 4, 2)
+        .unwrap()
+        .alignment
+        .unwrap();
     assert_eq!(alignment.vertical, VerticalAlignment::Top);
 
-    let alignment = model.get_style_for_cell(1, 5, 2).alignment.unwrap();
+    let alignment = model
+        .get_style_for_cell(1, 5, 2)
+        .unwrap()
+        .alignment
+        .unwrap();
     assert_eq!(alignment.vertical, VerticalAlignment::Center);
 
-    let alignment = model.get_style_for_cell(1, 6, 2).alignment.unwrap();
+    let alignment = model
+        .get_style_for_cell(1, 6, 2)
+        .unwrap()
+        .alignment
+        .unwrap();
     assert_eq!(alignment.vertical, VerticalAlignment::Justify);
 
-    let alignment = model.get_style_for_cell(1, 7, 2).alignment.unwrap();
+    let alignment = model
+        .get_style_for_cell(1, 7, 2)
+        .unwrap()
+        .alignment
+        .unwrap();
     assert_eq!(alignment.vertical, VerticalAlignment::Distributed);
 }
 
@@ -280,7 +320,9 @@ fn test_defined_names_casing() {
         ("=NaMeD3", "33"),
     ];
     for (formula, expected_value) in test_cases {
-        model.set_user_input(0, row, column, formula.to_string());
+        model
+            .set_user_input(0, row, column, formula.to_string())
+            .unwrap();
         model.evaluate();
         assert_eq!(
             model.get_formatted_cell_value(0, row, column).unwrap(),