| // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| library source_span.span_mixin; |
| |
| import 'package:path/path.dart' as p; |
| |
| import 'colors.dart' as colors; |
| import 'span.dart'; |
| import 'utils.dart'; |
| |
| /// A mixin for easily implementing [SourceSpan]. |
| /// |
| /// This implements the [SourceSpan] methods in terms of [start], [end], and |
| /// [text]. This assumes that [start] and [end] have the same source URL, that |
| /// [start] comes before [end], and that [text] has a number of characters equal |
| /// to the distance between [start] and [end]. |
| abstract class SourceSpanMixin implements SourceSpan { |
| Uri get sourceUrl => start.sourceUrl; |
| int get length => end.offset - start.offset; |
| |
| int compareTo(SourceSpan other) { |
| int d = start.compareTo(other.start); |
| return d == 0 ? end.compareTo(other.end) : d; |
| } |
| |
| SourceSpan union(SourceSpan other) { |
| if (sourceUrl != other.sourceUrl) { |
| throw new ArgumentError("Source URLs \"${sourceUrl}\" and " |
| " \"${other.sourceUrl}\" don't match."); |
| } |
| |
| var start = min(this.start, other.start); |
| var end = max(this.end, other.end); |
| var beginSpan = start == this.start ? this : other; |
| var endSpan = end == this.end ? this : other; |
| |
| if (beginSpan.end.compareTo(endSpan.start) < 0) { |
| throw new ArgumentError("Spans $this and $other are disjoint."); |
| } |
| |
| var text = beginSpan.text + |
| endSpan.text.substring(beginSpan.end.distance(endSpan.start)); |
| return new SourceSpan(start, end, text); |
| } |
| |
| String message(String message, {color}) { |
| if (color == true) color = colors.RED; |
| if (color == false) color = null; |
| |
| var buffer = new StringBuffer(); |
| buffer.write('line ${start.line + 1}, column ${start.column + 1}'); |
| if (sourceUrl != null) buffer.write(' of ${p.prettyUri(sourceUrl)}'); |
| buffer.write(': $message'); |
| if (length == 0) return buffer.toString(); |
| |
| buffer.write("\n"); |
| var textLine = text.split("\n").first; |
| if (color != null) buffer.write(color); |
| buffer.write(textLine); |
| buffer.write("\n"); |
| buffer.write('^' * textLine.length); |
| if (color != null) buffer.write(colors.NONE); |
| return buffer.toString(); |
| } |
| |
| bool operator ==(SourceSpan other) => |
| start == other.start && end == other.end; |
| |
| int get hashCode => start.hashCode + (31 * end.hashCode); |
| |
| String toString() => '<$runtimeType: from $start to $end "$text">'; |
| } |