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Original file line number | Diff line number | Diff line change |
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import 'package:flutter/material.dart'; | ||
import 'package:markdown_widget/markdown_widget.dart'; | ||
// ignore: depend_on_referenced_packages | ||
import 'package:markdown/markdown.dart' as m; | ||
import 'package:flutter_math_fork/flutter_math.dart'; | ||
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||
SpanNodeGeneratorWithTag latexGenerator = SpanNodeGeneratorWithTag( | ||
tag: _latexTag, | ||
generator: (e, config, visitor) => | ||
LatexNode(e.attributes, e.textContent, config)); | ||
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const _latexTag = 'latex'; | ||
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class LatexSyntax extends m.InlineSyntax { | ||
LatexSyntax() : super(r'(\$\$[\s\S]+\$\$)|(\$.+?\$)'); | ||
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@override | ||
bool onMatch(m.InlineParser parser, Match match) { | ||
final input = match.input; | ||
final matchValue = input.substring(match.start, match.end); | ||
String content = ''; | ||
bool isInline = true; | ||
const blockSyntax = '\$\$'; | ||
const inlineSyntax = '\$'; | ||
if (matchValue.startsWith(blockSyntax) && | ||
matchValue.endsWith(blockSyntax) && | ||
(matchValue != blockSyntax)) { | ||
content = matchValue.substring(2, matchValue.length - 2); | ||
isInline = false; | ||
} else if (matchValue.startsWith(inlineSyntax) && | ||
matchValue.endsWith(inlineSyntax) && | ||
matchValue != inlineSyntax) { | ||
content = matchValue.substring(1, matchValue.length - 1); | ||
} | ||
m.Element el = m.Element.text(_latexTag, matchValue); | ||
el.attributes['content'] = content; | ||
el.attributes['isInline'] = '$isInline'; | ||
parser.addNode(el); | ||
return true; | ||
} | ||
} | ||
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class LatexNode extends SpanNode { | ||
final Map<String, String> attributes; | ||
final String textContent; | ||
final MarkdownConfig config; | ||
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LatexNode(this.attributes, this.textContent, this.config); | ||
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@override | ||
InlineSpan build() { | ||
final content = attributes['content'] ?? ''; | ||
final isInline = attributes['isInline'] == 'true'; | ||
final style = parentStyle ?? config.p.textStyle; | ||
if (content.isEmpty) return TextSpan(style: style, text: textContent); | ||
final latex = Math.tex( | ||
content, | ||
mathStyle: MathStyle.text, | ||
textStyle: style.copyWith(color: Colors.black), | ||
textScaleFactor: 1, | ||
onErrorFallback: (error) { | ||
return Text( | ||
textContent, | ||
style: style.copyWith(color: Colors.red), | ||
); | ||
}, | ||
); | ||
return WidgetSpan( | ||
alignment: PlaceholderAlignment.middle, | ||
child: !isInline | ||
? Container( | ||
width: double.infinity, | ||
margin: const EdgeInsets.symmetric(vertical: 16), | ||
child: Center(child: latex), | ||
) | ||
: latex); | ||
} | ||
} |
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