mirror of
https://github.com/alibaba/flutter-go.git
synced 2025-07-15 03:04:25 +08:00
367 lines
9.6 KiB
Dart
367 lines
9.6 KiB
Dart
/// @Author: 一凨
|
|
/// @Date: 2019-01-14 11:42:39
|
|
/// @Last Modified by: 一凨
|
|
/// @Last Modified time: 2019-01-14 11:42:39
|
|
|
|
import 'package:flutter/material.dart';
|
|
import 'package:string_scanner/string_scanner.dart';
|
|
|
|
class SyntaxHighlighterStyle {
|
|
SyntaxHighlighterStyle(
|
|
{this.baseStyle,
|
|
this.numberStyle,
|
|
this.commentStyle,
|
|
this.keywordStyle,
|
|
this.stringStyle,
|
|
this.punctuationStyle,
|
|
this.classStyle,
|
|
this.constantStyle});
|
|
|
|
static SyntaxHighlighterStyle lightThemeStyle() {
|
|
return SyntaxHighlighterStyle(
|
|
baseStyle: const TextStyle(color: Color(0xFF000000)),
|
|
numberStyle: const TextStyle(color: Color(0xFF1565C0)),
|
|
commentStyle: const TextStyle(color: Color(0xFF9E9E9E)),
|
|
keywordStyle: const TextStyle(color: Color(0xFF9C27B0)),
|
|
stringStyle: const TextStyle(color: Color(0xFF43A047)),
|
|
punctuationStyle: const TextStyle(color: Color(0xFF000000)),
|
|
classStyle: const TextStyle(color: Color(0xFF512DA8)),
|
|
constantStyle: const TextStyle(color: Color(0xFF795548)));
|
|
}
|
|
|
|
static SyntaxHighlighterStyle darkThemeStyle() {
|
|
return SyntaxHighlighterStyle(
|
|
baseStyle: const TextStyle(color: Color(0xFFFFFFFF)),
|
|
numberStyle: const TextStyle(color: Color(0xFF1565C0)),
|
|
commentStyle: const TextStyle(color: Color(0xFF9E9E9E)),
|
|
keywordStyle: const TextStyle(color: Color(0xFF80CBC4)),
|
|
stringStyle: const TextStyle(color: Color(0xFF009688)),
|
|
punctuationStyle: const TextStyle(color: Color(0xFFFFFFFF)),
|
|
classStyle: const TextStyle(color: Color(0xFF009688)),
|
|
constantStyle: const TextStyle(color: Color(0xFF795548)));
|
|
}
|
|
|
|
final TextStyle baseStyle;
|
|
final TextStyle numberStyle;
|
|
final TextStyle commentStyle;
|
|
final TextStyle keywordStyle;
|
|
final TextStyle stringStyle;
|
|
final TextStyle punctuationStyle;
|
|
final TextStyle classStyle;
|
|
final TextStyle constantStyle;
|
|
}
|
|
|
|
abstract class SyntaxHighlighter {
|
|
// ignore: one_member_abstracts
|
|
TextSpan format(String src);
|
|
}
|
|
|
|
class DartSyntaxHighlighter extends SyntaxHighlighter {
|
|
DartSyntaxHighlighter([this._style]) {
|
|
_spans = <_HighlightSpan>[];
|
|
_style ??= SyntaxHighlighterStyle.darkThemeStyle();
|
|
}
|
|
|
|
SyntaxHighlighterStyle _style;
|
|
|
|
static const List<String> _keywords = <String>[
|
|
'abstract',
|
|
'as',
|
|
'assert',
|
|
'async',
|
|
'await',
|
|
'break',
|
|
'case',
|
|
'catch',
|
|
'class',
|
|
'const',
|
|
'continue',
|
|
'default',
|
|
'deferred',
|
|
'do',
|
|
'dynamic',
|
|
'else',
|
|
'enum',
|
|
'export',
|
|
'external',
|
|
'extends',
|
|
'factory',
|
|
'false',
|
|
'final',
|
|
'finally',
|
|
'for',
|
|
'get',
|
|
'if',
|
|
'implements',
|
|
'import',
|
|
'in',
|
|
'is',
|
|
'library',
|
|
'new',
|
|
'null',
|
|
'operator',
|
|
'part',
|
|
'rethrow',
|
|
'return',
|
|
'set',
|
|
'static',
|
|
'super',
|
|
'switch',
|
|
'sync',
|
|
'this',
|
|
'throw',
|
|
'true',
|
|
'try',
|
|
'typedef',
|
|
'var',
|
|
'void',
|
|
'while',
|
|
'with',
|
|
'yield'
|
|
];
|
|
|
|
static const List<String> _builtInTypes = <String>[
|
|
'int',
|
|
'double',
|
|
'num',
|
|
'bool'
|
|
];
|
|
|
|
String _src;
|
|
StringScanner _scanner;
|
|
|
|
List<_HighlightSpan> _spans;
|
|
|
|
@override
|
|
TextSpan format(String src) {
|
|
_src = src;
|
|
_scanner = StringScanner(_src);
|
|
|
|
if (_generateSpans()) {
|
|
// Successfully parsed the code
|
|
final List<TextSpan> formattedText = <TextSpan>[];
|
|
int currentPosition = 0;
|
|
|
|
for (_HighlightSpan span in _spans) {
|
|
if (currentPosition != span.start)
|
|
formattedText
|
|
.add(TextSpan(text: _src.substring(currentPosition, span.start)));
|
|
|
|
formattedText.add(TextSpan(
|
|
style: span.textStyle(_style), text: span.textForSpan(_src)));
|
|
|
|
currentPosition = span.end;
|
|
}
|
|
|
|
if (currentPosition != _src.length)
|
|
formattedText
|
|
.add(TextSpan(text: _src.substring(currentPosition, _src.length)));
|
|
|
|
return TextSpan(style: _style.baseStyle, children: formattedText);
|
|
} else {
|
|
// Parsing failed, return with only basic formatting
|
|
return TextSpan(style: _style.baseStyle, text: src);
|
|
}
|
|
}
|
|
|
|
bool _generateSpans() {
|
|
int lastLoopPosition = _scanner.position;
|
|
|
|
while (!_scanner.isDone) {
|
|
// Skip White space
|
|
_scanner.scan(RegExp(r'\s+'));
|
|
|
|
// Block comments
|
|
if (_scanner.scan(RegExp(r'/\*(.|\n)*\*/'))) {
|
|
_spans.add(_HighlightSpan(_HighlightType.comment,
|
|
_scanner.lastMatch.start, _scanner.lastMatch.end));
|
|
continue;
|
|
}
|
|
|
|
// Line comments
|
|
if (_scanner.scan('//')) {
|
|
final int startComment = _scanner.lastMatch.start;
|
|
|
|
bool eof = false;
|
|
int endComment;
|
|
if (_scanner.scan(RegExp(r'.*\n'))) {
|
|
endComment = _scanner.lastMatch.end - 1;
|
|
} else {
|
|
eof = true;
|
|
endComment = _src.length;
|
|
}
|
|
|
|
_spans.add(
|
|
_HighlightSpan(_HighlightType.comment, startComment, endComment));
|
|
|
|
if (eof) break;
|
|
|
|
continue;
|
|
}
|
|
|
|
// Raw r"String"
|
|
if (_scanner.scan(RegExp(r'r".*"'))) {
|
|
_spans.add(_HighlightSpan(_HighlightType.string,
|
|
_scanner.lastMatch.start, _scanner.lastMatch.end));
|
|
continue;
|
|
}
|
|
|
|
// Raw r'String'
|
|
if (_scanner.scan(RegExp(r"r'.*'"))) {
|
|
_spans.add(_HighlightSpan(_HighlightType.string,
|
|
_scanner.lastMatch.start, _scanner.lastMatch.end));
|
|
continue;
|
|
}
|
|
|
|
// Multiline """String"""
|
|
if (_scanner.scan(RegExp(r'"""(?:[^"\\]|\\(.|\n))*"""'))) {
|
|
_spans.add(_HighlightSpan(_HighlightType.string,
|
|
_scanner.lastMatch.start, _scanner.lastMatch.end));
|
|
continue;
|
|
}
|
|
|
|
// Multiline '''String'''
|
|
if (_scanner.scan(RegExp(r"'''(?:[^'\\]|\\(.|\n))*'''"))) {
|
|
_spans.add(_HighlightSpan(_HighlightType.string,
|
|
_scanner.lastMatch.start, _scanner.lastMatch.end));
|
|
continue;
|
|
}
|
|
|
|
// "String"
|
|
if (_scanner.scan(RegExp(r'"(?:[^"\\]|\\.)*"'))) {
|
|
_spans.add(_HighlightSpan(_HighlightType.string,
|
|
_scanner.lastMatch.start, _scanner.lastMatch.end));
|
|
continue;
|
|
}
|
|
|
|
// 'String'
|
|
if (_scanner.scan(RegExp(r"'(?:[^'\\]|\\.)*'"))) {
|
|
_spans.add(_HighlightSpan(_HighlightType.string,
|
|
_scanner.lastMatch.start, _scanner.lastMatch.end));
|
|
continue;
|
|
}
|
|
|
|
// Double
|
|
if (_scanner.scan(RegExp(r'\d+\.\d+'))) {
|
|
_spans.add(_HighlightSpan(_HighlightType.number,
|
|
_scanner.lastMatch.start, _scanner.lastMatch.end));
|
|
continue;
|
|
}
|
|
|
|
// Integer
|
|
if (_scanner.scan(RegExp(r'\d+'))) {
|
|
_spans.add(_HighlightSpan(_HighlightType.number,
|
|
_scanner.lastMatch.start, _scanner.lastMatch.end));
|
|
continue;
|
|
}
|
|
|
|
// Punctuation
|
|
if (_scanner.scan(RegExp(r'[\[\]{}().!=<>&\|\?\+\-\*/%\^~;:,]'))) {
|
|
_spans.add(_HighlightSpan(_HighlightType.punctuation,
|
|
_scanner.lastMatch.start, _scanner.lastMatch.end));
|
|
continue;
|
|
}
|
|
|
|
// Meta data
|
|
if (_scanner.scan(RegExp(r'@\w+'))) {
|
|
_spans.add(_HighlightSpan(_HighlightType.keyword,
|
|
_scanner.lastMatch.start, _scanner.lastMatch.end));
|
|
continue;
|
|
}
|
|
|
|
// Words
|
|
if (_scanner.scan(RegExp(r'\w+'))) {
|
|
_HighlightType type;
|
|
|
|
String word = _scanner.lastMatch[0];
|
|
if (word.startsWith('_')) word = word.substring(1);
|
|
|
|
if (_keywords.contains(word))
|
|
type = _HighlightType.keyword;
|
|
else if (_builtInTypes.contains(word))
|
|
type = _HighlightType.keyword;
|
|
else if (_firstLetterIsUpperCase(word))
|
|
type = _HighlightType.klass;
|
|
else if (word.length >= 2 &&
|
|
word.startsWith('k') &&
|
|
_firstLetterIsUpperCase(word.substring(1)))
|
|
type = _HighlightType.constant;
|
|
|
|
if (type != null) {
|
|
_spans.add(_HighlightSpan(
|
|
type, _scanner.lastMatch.start, _scanner.lastMatch.end));
|
|
}
|
|
}
|
|
|
|
// Check if this loop did anything
|
|
if (lastLoopPosition == _scanner.position) {
|
|
// Failed to parse this file, abort gracefully
|
|
return false;
|
|
}
|
|
lastLoopPosition = _scanner.position;
|
|
}
|
|
|
|
_simplify();
|
|
return true;
|
|
}
|
|
|
|
void _simplify() {
|
|
for (int i = _spans.length - 2; i >= 0; i -= 1) {
|
|
if (_spans[i].type == _spans[i + 1].type &&
|
|
_spans[i].end == _spans[i + 1].start) {
|
|
_spans[i] =
|
|
_HighlightSpan(_spans[i].type, _spans[i].start, _spans[i + 1].end);
|
|
_spans.removeAt(i + 1);
|
|
}
|
|
}
|
|
}
|
|
|
|
bool _firstLetterIsUpperCase(String str) {
|
|
if (str.isNotEmpty) {
|
|
final String first = str.substring(0, 1);
|
|
return first == first.toUpperCase();
|
|
}
|
|
return false;
|
|
}
|
|
}
|
|
|
|
enum _HighlightType {
|
|
number,
|
|
comment,
|
|
keyword,
|
|
string,
|
|
punctuation,
|
|
klass,
|
|
constant
|
|
}
|
|
|
|
class _HighlightSpan {
|
|
_HighlightSpan(this.type, this.start, this.end);
|
|
final _HighlightType type;
|
|
final int start;
|
|
final int end;
|
|
|
|
String textForSpan(String src) {
|
|
return src.substring(start, end);
|
|
}
|
|
|
|
TextStyle textStyle(SyntaxHighlighterStyle style) {
|
|
if (type == _HighlightType.number)
|
|
return style.numberStyle;
|
|
else if (type == _HighlightType.comment)
|
|
return style.commentStyle;
|
|
else if (type == _HighlightType.keyword)
|
|
return style.keywordStyle;
|
|
else if (type == _HighlightType.string)
|
|
return style.stringStyle;
|
|
else if (type == _HighlightType.punctuation)
|
|
return style.punctuationStyle;
|
|
else if (type == _HighlightType.klass)
|
|
return style.classStyle;
|
|
else if (type == _HighlightType.constant)
|
|
return style.constantStyle;
|
|
else
|
|
return style.baseStyle;
|
|
}
|
|
}
|