lrn@google.com
642b7d8a05
This reapplies r9246 without the (known) bugs. Review URL: https://chromiumcodereview.appspot.com//10689063 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@9282 260f80e4-7a28-3924-810f-c04153c831b5
92 lines
2.4 KiB
Dart
92 lines
2.4 KiB
Dart
// Copyright (c) 2012, 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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#library('source_file');
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#import('colors.dart', prefix: 'colors');
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/**
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* Represents a file of source code.
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*/
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class SourceFile {
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/** The name of the file. */
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final String filename;
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/** The text content of the file. */
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final String text;
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List<int> _lineStarts;
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SourceFile(this.filename, this.text);
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List<int> get lineStarts() {
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if (_lineStarts == null) {
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var starts = [0];
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var index = 0;
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while (index < text.length) {
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index = text.indexOf('\n', index) + 1;
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if (index <= 0) break;
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starts.add(index);
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}
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starts.add(text.length + 1);
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_lineStarts = starts;
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}
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return _lineStarts;
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}
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int getLine(int position) {
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// TODO(jimhug): Implement as binary search.
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var starts = lineStarts;
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for (int i=0; i < starts.length; i++) {
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if (starts[i] > position) return i-1;
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}
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throw 'bad position #$position in file $filename with '
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'length ${text.length}.';
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}
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int getColumn(int line, int position) {
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return position - lineStarts[line];
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}
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/**
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* Create a pretty string representation from a character position
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* in the file.
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*/
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String getLocationMessage(String message, int start, int end,
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bool includeText, String color(String x)) {
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var line = getLine(start);
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var column = getColumn(line, start);
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var buf = new StringBuffer(
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'${filename}:${line + 1}:${column + 1}: $message');
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if (includeText) {
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buf.add('\n');
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var textLine;
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// +1 for 0-indexing, +1 again to avoid the last line of the file
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if ((line + 2) < _lineStarts.length) {
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textLine = text.substring(_lineStarts[line], _lineStarts[line+1]);
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} else {
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textLine = '${text.substring(_lineStarts[line])}\n';
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}
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int toColumn = Math.min(column + (end-start), textLine.length);
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buf.add(textLine.substring(0, column));
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buf.add(color(textLine.substring(column, toColumn)));
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buf.add(textLine.substring(toColumn));
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int i = 0;
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for (; i < column; i++) {
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buf.add(' ');
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}
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for (; i < toColumn; i++) {
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buf.add(color('^'));
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}
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}
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return buf.toString();
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}
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}
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