mirror of
https://github.com/alibaba/flutter-go.git
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358 lines
9.7 KiB
Dart
358 lines
9.7 KiB
Dart
/// @Author: 一凨
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/// @Date: 2019-01-14 11:42:39
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/// @Last Modified by: 一凨
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/// @Last Modified time: 2019-01-14 11:42:39
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import 'package:flutter/material.dart';
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import 'package:string_scanner/string_scanner.dart';
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class SyntaxHighlighterStyle {
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SyntaxHighlighterStyle({
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this.baseStyle,
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this.numberStyle,
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this.commentStyle,
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this.keywordStyle,
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this.stringStyle,
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this.punctuationStyle,
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this.classStyle,
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this.constantStyle
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});
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static SyntaxHighlighterStyle lightThemeStyle() {
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return SyntaxHighlighterStyle(
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baseStyle: const TextStyle(color: Color(0xFF000000)),
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numberStyle: const TextStyle(color: Color(0xFF1565C0)),
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commentStyle: const TextStyle(color: Color(0xFF9E9E9E)),
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keywordStyle: const TextStyle(color: Color(0xFF9C27B0)),
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stringStyle: const TextStyle(color: Color(0xFF43A047)),
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punctuationStyle: const TextStyle(color: Color(0xFF000000)),
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classStyle: const TextStyle(color: Color(0xFF512DA8)),
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constantStyle: const TextStyle(color: Color(0xFF795548))
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);
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}
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static SyntaxHighlighterStyle darkThemeStyle() {
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return SyntaxHighlighterStyle(
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baseStyle: const TextStyle(color: Color(0xFFFFFFFF)),
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numberStyle: const TextStyle(color: Color(0xFF1565C0)),
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commentStyle: const TextStyle(color: Color(0xFF9E9E9E)),
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keywordStyle: const TextStyle(color: Color(0xFF80CBC4)),
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stringStyle: const TextStyle(color: Color(0xFF009688)),
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punctuationStyle: const TextStyle(color: Color(0xFFFFFFFF)),
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classStyle: const TextStyle(color: Color(0xFF009688)),
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constantStyle: const TextStyle(color: Color(0xFF795548))
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);
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}
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final TextStyle baseStyle;
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final TextStyle numberStyle;
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final TextStyle commentStyle;
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final TextStyle keywordStyle;
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final TextStyle stringStyle;
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final TextStyle punctuationStyle;
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final TextStyle classStyle;
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final TextStyle constantStyle;
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}
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abstract class SyntaxHighlighter { // ignore: one_member_abstracts
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TextSpan format(String src);
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}
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class DartSyntaxHighlighter extends SyntaxHighlighter {
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DartSyntaxHighlighter([this._style]) {
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_spans = <_HighlightSpan>[];
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_style ??= SyntaxHighlighterStyle.darkThemeStyle();
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}
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SyntaxHighlighterStyle _style;
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static const List<String> _keywords = <String>[
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'abstract', 'as', 'assert', 'async', 'await', 'break', 'case', 'catch',
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'class', 'const', 'continue', 'default', 'deferred', 'do', 'dynamic', 'else',
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'enum', 'export', 'external', 'extends', 'factory', 'false', 'final',
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'finally', 'for', 'get', 'if', 'implements', 'import', 'in', 'is', 'library',
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'new', 'null', 'operator', 'part', 'rethrow', 'return', 'set', 'static',
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'super', 'switch', 'sync', 'this', 'throw', 'true', 'try', 'typedef', 'var',
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'void', 'while', 'with', 'yield'
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];
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static const List<String> _builtInTypes = <String>[
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'int', 'double', 'num', 'bool'
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];
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String _src;
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StringScanner _scanner;
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List<_HighlightSpan> _spans;
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@override
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TextSpan format(String src) {
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_src = src;
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_scanner = StringScanner(_src);
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if (_generateSpans()) {
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// Successfully parsed the code
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final List<TextSpan> formattedText = <TextSpan>[];
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int currentPosition = 0;
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for (_HighlightSpan span in _spans) {
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if (currentPosition != span.start)
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formattedText.add(TextSpan(text: _src.substring(currentPosition, span.start)));
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formattedText.add(TextSpan(style: span.textStyle(_style), text: span.textForSpan(_src)));
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currentPosition = span.end;
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}
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if (currentPosition != _src.length)
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formattedText.add(TextSpan(text: _src.substring(currentPosition, _src.length)));
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return TextSpan(style: _style.baseStyle, children: formattedText);
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} else {
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// Parsing failed, return with only basic formatting
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return TextSpan(style: _style.baseStyle, text: src);
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}
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}
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bool _generateSpans() {
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int lastLoopPosition = _scanner.position;
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while (!_scanner.isDone) {
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// Skip White space
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_scanner.scan(RegExp(r'\s+'));
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// Block comments
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if (_scanner.scan(RegExp(r'/\*(.|\n)*\*/'))) {
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_spans.add(_HighlightSpan(
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_HighlightType.comment,
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_scanner.lastMatch.start,
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_scanner.lastMatch.end
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));
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continue;
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}
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// Line comments
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if (_scanner.scan('//')) {
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final int startComment = _scanner.lastMatch.start;
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bool eof = false;
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int endComment;
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if (_scanner.scan(RegExp(r'.*\n'))) {
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endComment = _scanner.lastMatch.end - 1;
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} else {
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eof = true;
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endComment = _src.length;
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}
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_spans.add(_HighlightSpan(
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_HighlightType.comment,
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startComment,
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endComment
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));
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if (eof)
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break;
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continue;
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}
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// Raw r"String"
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if (_scanner.scan(RegExp(r'r".*"'))) {
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_spans.add(_HighlightSpan(
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_HighlightType.string,
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_scanner.lastMatch.start,
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_scanner.lastMatch.end
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));
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continue;
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}
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// Raw r'String'
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if (_scanner.scan(RegExp(r"r'.*'"))) {
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_spans.add(_HighlightSpan(
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_HighlightType.string,
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_scanner.lastMatch.start,
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_scanner.lastMatch.end
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));
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continue;
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}
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// Multiline """String"""
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if (_scanner.scan(RegExp(r'"""(?:[^"\\]|\\(.|\n))*"""'))) {
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_spans.add(_HighlightSpan(
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_HighlightType.string,
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_scanner.lastMatch.start,
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_scanner.lastMatch.end
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));
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continue;
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}
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// Multiline '''String'''
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if (_scanner.scan(RegExp(r"'''(?:[^'\\]|\\(.|\n))*'''"))) {
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_spans.add(_HighlightSpan(
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_HighlightType.string,
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_scanner.lastMatch.start,
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_scanner.lastMatch.end
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));
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continue;
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}
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// "String"
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if (_scanner.scan(RegExp(r'"(?:[^"\\]|\\.)*"'))) {
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_spans.add(_HighlightSpan(
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_HighlightType.string,
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_scanner.lastMatch.start,
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_scanner.lastMatch.end
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));
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continue;
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}
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// 'String'
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if (_scanner.scan(RegExp(r"'(?:[^'\\]|\\.)*'"))) {
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_spans.add(_HighlightSpan(
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_HighlightType.string,
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_scanner.lastMatch.start,
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_scanner.lastMatch.end
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));
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continue;
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}
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// Double
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if (_scanner.scan(RegExp(r'\d+\.\d+'))) {
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_spans.add(_HighlightSpan(
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_HighlightType.number,
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_scanner.lastMatch.start,
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_scanner.lastMatch.end
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));
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continue;
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}
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// Integer
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if (_scanner.scan(RegExp(r'\d+'))) {
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_spans.add(_HighlightSpan(
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_HighlightType.number,
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_scanner.lastMatch.start,
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_scanner.lastMatch.end)
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);
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continue;
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}
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// Punctuation
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if (_scanner.scan(RegExp(r'[\[\]{}().!=<>&\|\?\+\-\*/%\^~;:,]'))) {
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_spans.add(_HighlightSpan(
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_HighlightType.punctuation,
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_scanner.lastMatch.start,
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_scanner.lastMatch.end
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));
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continue;
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}
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// Meta data
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if (_scanner.scan(RegExp(r'@\w+'))) {
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_spans.add(_HighlightSpan(
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_HighlightType.keyword,
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_scanner.lastMatch.start,
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_scanner.lastMatch.end
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));
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continue;
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}
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// Words
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if (_scanner.scan(RegExp(r'\w+'))) {
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_HighlightType type;
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String word = _scanner.lastMatch[0];
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if (word.startsWith('_'))
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word = word.substring(1);
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if (_keywords.contains(word))
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type = _HighlightType.keyword;
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else if (_builtInTypes.contains(word))
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type = _HighlightType.keyword;
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else if (_firstLetterIsUpperCase(word))
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type = _HighlightType.klass;
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else if (word.length >= 2 && word.startsWith('k') && _firstLetterIsUpperCase(word.substring(1)))
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type = _HighlightType.constant;
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if (type != null) {
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_spans.add(_HighlightSpan(
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type,
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_scanner.lastMatch.start,
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_scanner.lastMatch.end
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));
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}
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}
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// Check if this loop did anything
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if (lastLoopPosition == _scanner.position) {
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// Failed to parse this file, abort gracefully
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return false;
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}
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lastLoopPosition = _scanner.position;
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}
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_simplify();
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return true;
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}
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void _simplify() {
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for (int i = _spans.length - 2; i >= 0; i -= 1) {
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if (_spans[i].type == _spans[i + 1].type && _spans[i].end == _spans[i + 1].start) {
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_spans[i] = _HighlightSpan(
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_spans[i].type,
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_spans[i].start,
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_spans[i + 1].end
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);
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_spans.removeAt(i + 1);
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}
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}
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}
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bool _firstLetterIsUpperCase(String str) {
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if (str.isNotEmpty) {
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final String first = str.substring(0, 1);
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return first == first.toUpperCase();
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}
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return false;
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}
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}
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enum _HighlightType {
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number,
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comment,
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keyword,
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string,
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punctuation,
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klass,
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constant
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}
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class _HighlightSpan {
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_HighlightSpan(this.type, this.start, this.end);
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final _HighlightType type;
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final int start;
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final int end;
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String textForSpan(String src) {
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return src.substring(start, end);
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}
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TextStyle textStyle(SyntaxHighlighterStyle style) {
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if (type == _HighlightType.number)
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return style.numberStyle;
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else if (type == _HighlightType.comment)
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return style.commentStyle;
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else if (type == _HighlightType.keyword)
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return style.keywordStyle;
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else if (type == _HighlightType.string)
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return style.stringStyle;
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else if (type == _HighlightType.punctuation)
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return style.punctuationStyle;
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else if (type == _HighlightType.klass)
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return style.classStyle;
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else if (type == _HighlightType.constant)
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return style.constantStyle;
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else
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return style.baseStyle;
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}
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}
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