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feat: add support for LaTeX inline math replacement in MarkdownDecoder #21

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feat: add support for LaTeX inline math replacement in MarkdownDecoder #21

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10 changes: 10 additions & 0 deletions lib/src/parser.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -35,8 +35,18 @@ class MarkdownDecoder extends Converter<String, Markdown> {
static final RegExp _listPattern = RegExp(
r'^(?<indent>[ \t]{0,8})(?<marker>(\d{1,9})[\.)]|[*+-])(?<text>[ \t]+(.*))?$');

/// Replaces common LaTeX inline math with Unicode equivalents.
static String _replaceInlineMath(String text) => text
.replaceAll(r'$\rightarrow$', '\u{2192}')
.replaceAll(r'$\leftarrow$', '\u{2190}')
.replaceAll(r'$\Rightarrow$', '\u{21D2}')
.replaceAll(r'$\Leftarrow$', '\u{21D0}')
.replaceAll(r'$\Leftrightarrow$', '\u{21D4}');

@override
Markdown convert(String input) {
input = _replaceInlineMath(input);

final lines = LineSplitter.split(input).toList(growable: false);
if (lines.isEmpty) return const Markdown.empty();
final blocks = Queue<MD$Block>(); // Queue to accumulate blocks
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11 changes: 11 additions & 0 deletions test/parser/parser_test.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -411,6 +411,17 @@ void main() => group('Parse', () {
}
});

test('Parse LaTeX inline math replaces rightarrow with arrow', () {
final markdown = markdownDecoder.convert(r'A $\rightarrow$ B');
expect(markdown.blocks, hasLength(1));
final paragraph = markdown.blocks.first as MD$Paragraph;
expect(paragraph.text, contains('→'));
expect(
paragraph.spans.map((s) => s.text).join(),
contains('→'),
);
});

group('Parse escaped characters', () {
const escapedCharacterTests = {
r'\\': r'\', // Backslash
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