52 lines
1.3 KiB
Dart
52 lines
1.3 KiB
Dart
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// Copyright (c) 2023, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import 'dart:io';
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import 'package:source_span/source_span.dart';
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void main(List<String> args) {
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final file = File('README.md');
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final contents = file.readAsStringSync();
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final sourceFile = SourceFile.fromString(contents, url: file.uri);
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final spans = _parseFile(contents, sourceFile);
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for (var span in spans.take(30)) {
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print('[${span.start.line + 1}:${span.start.column + 1}] ${span.text}');
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}
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}
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Iterable<SourceSpan> _parseFile(String contents, SourceFile sourceFile) sync* {
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var wordStart = 0;
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var inWhiteSpace = true;
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for (var i = 0; i < contents.length; i++) {
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final codeUnit = contents.codeUnitAt(i);
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if (codeUnit == _eol || codeUnit == _space) {
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if (!inWhiteSpace) {
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inWhiteSpace = true;
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// emit a word
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yield sourceFile.span(wordStart, i);
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}
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} else {
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if (inWhiteSpace) {
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inWhiteSpace = false;
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wordStart = i;
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}
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}
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}
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if (!inWhiteSpace) {
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// emit a word
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yield sourceFile.span(wordStart, contents.length);
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}
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}
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const int _eol = 10;
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const int _space = 32;
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