Additional error handling edge cases (#356)

* Add additional bad tests

* [c] Optimise error handling for empty datatable rows

* [Perl] Optimise error handling for unclosed DocStrings

CHANGELOG.md

@@ -17,6 +17,8 @@ This document is formatted according to the principles of [Keep A CHANGELOG](htt
 
 ### Fixed
 - [.NET] Fix NuGet package generation
+- [c] Optimise error handling for empty datatable rows
+- [Perl] Optimise error handling for unclosed DocStrings
 
 ## [31.0.0] - 2025-01-29
 ### Added

c/src/gherkin_line.c

@@ -76,17 +76,22 @@ wchar_t* GherkinLine_copy_line_text(const GherkinLine* line, int indent_to_remov
 
 const Items* GherkinLine_table_cells(const GherkinLine* line) {
     int item_count = calculate_cell_count(line->trimmed_line);
-    if (item_count == 0)
-        return (Items*)0;
+    Items* item_array = (Items*)malloc(sizeof(Items));
+    item_array->count = item_count;
+
+    if (item_count == 0) {
+        item_array->items = 0;
+        return item_array;
+    }
+
     Span* items = (Span*)malloc(item_count * sizeof(Span));
     int i;
     for (i = 0; i < item_count; ++i) {
         items[i].column = 0;
         items[i].text = 0;
     }
-    Items* item_array = (Items*)malloc(sizeof(Items));
-    item_array->count = item_count;
     item_array->items = items;
+
     const wchar_t* current_pos = line->trimmed_line;
     for (i = 0; i < item_count; ++i) {
         current_pos = populate_cell_data(&items[i], current_pos, current_pos - line->line_text);

perl/lib/Gherkin/TokenMatcher.pm

@@ -238,6 +238,9 @@ sub match_StepLine {
 
 sub match_DocStringSeparator {
     my ( $self, $token ) = @_;
+    if ($token->is_eof) {
+        return 0;
+    }
     if ( !$self->_active_doc_string_separator ) {
         return $self->_match_DocStringSeparator( $token, '"""', 1 )
           || $self->_match_DocStringSeparator( $token, '```', 1 );

testdata/bad/backslash_at_end_of_line_in_datatable.feature

@@ -0,0 +1,5 @@
+Feature: Addition
+Scenario: Add two numbers
+	When I press
+		| foo |
+		| bar \

testdata/bad/backslash_at_end_of_line_in_datatable.feature.errors.ndjson

@@ -0,0 +1 @@
+{"parseError":{"message":"(5:3): inconsistent cell count within the table","source":{"location":{"column":3,"line":5},"uri":"../testdata/bad/backslash_at_end_of_line_in_datatable.feature"}}}

testdata/bad/file_ends_with_open_docstring.feature

@@ -0,0 +1,4 @@
+Feature: Addition
+Scenario: Add two numbers
+  Given I have added
+    ```

testdata/bad/file_ends_with_open_docstring.feature.errors.ndjson

@@ -0,0 +1 @@
+{"parseError":{"message":"(5:0): unexpected end of file, expected: #DocStringSeparator, #Other","source":{"location":{"line":5},"uri":"../testdata/bad/file_ends_with_open_docstring.feature"}}}

testdata/bad/unexpected_end_of_file.feature

@@ -0,0 +1,2 @@
+Feature: Addition
+@tag

testdata/bad/unexpected_end_of_file.feature.errors.ndjson

@@ -0,0 +1 @@
+{"parseError":{"message":"(3:0): unexpected end of file, expected: #TagLine, #RuleLine, #Comment, #Empty","source":{"location":{"line":3},"uri":"../testdata/bad/unexpected_end_of_file.feature"}}}

testdata/bad/unfinished_datatable.feature

@@ -0,0 +1,5 @@
+Feature: Addition
+Scenario: Add two numbers
+	When I press
+		| foo |
+		| bar

testdata/bad/unfinished_datatable.feature.errors.ndjson

@@ -0,0 +1 @@
+{"parseError":{"message":"(5:3): inconsistent cell count within the table","source":{"location":{"column":3,"line":5},"uri":"../testdata/bad/unfinished_datatable.feature"}}}