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| 1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file |
| 2 // for details. All rights reserved. Use of this source code is governed by a |
| 3 // BSD-style license that can be found in the LICENSE file. |
| 4 |
| 5 library source_span.span_mixin; |
| 6 |
| 7 import 'package:path/path.dart' as p; |
| 8 |
| 9 import 'colors.dart' as colors; |
| 10 import 'span.dart'; |
| 11 import 'utils.dart'; |
| 12 |
| 13 /// A mixin for easily implementing [SourceSpan]. |
| 14 /// |
| 15 /// This implements the [SourceSpan] methods in terms of [start], [end], and |
| 16 /// [text]. This assumes that [start] and [end] have the same source URL, that |
| 17 /// [start] comes before [end], and that [text] has a number of characters equal |
| 18 /// to the distance between [start] and [end]. |
| 19 abstract class SourceSpanMixin implements SourceSpan { |
| 20 Uri get sourceUrl => start.sourceUrl; |
| 21 int get length => end.offset - start.offset; |
| 22 |
| 23 int compareTo(SourceSpan other) { |
| 24 int d = start.compareTo(other.start); |
| 25 return d == 0 ? end.compareTo(other.end) : d; |
| 26 } |
| 27 |
| 28 SourceSpan union(SourceSpan other) { |
| 29 if (sourceUrl != other.sourceUrl) { |
| 30 throw new ArgumentError("Source URLs \"${sourceUrl}\" and " |
| 31 " \"${other.sourceUrl}\" don't match."); |
| 32 } |
| 33 |
| 34 var start = min(this.start, other.start); |
| 35 var end = max(this.end, other.end); |
| 36 var beginSpan = start == this.start ? this : other; |
| 37 var endSpan = end == this.end ? this : other; |
| 38 |
| 39 if (beginSpan.end.compareTo(endSpan.start) < 0) { |
| 40 throw new ArgumentError("Spans $this and $other are disjoint."); |
| 41 } |
| 42 |
| 43 var text = beginSpan.text + |
| 44 endSpan.text.substring(beginSpan.end.distance(endSpan.start)); |
| 45 return new SourceSpan(start, end, text); |
| 46 } |
| 47 |
| 48 String message(String message, {color}) { |
| 49 if (color == true) color = colors.RED; |
| 50 if (color == false) color = null; |
| 51 |
| 52 var buffer = new StringBuffer(); |
| 53 buffer.write('line ${start.line + 1}, column ${start.column + 1}'); |
| 54 if (sourceUrl != null) buffer.write(' of ${p.prettyUri(sourceUrl)}'); |
| 55 buffer.write(': $message'); |
| 56 if (length == 0) return buffer.toString(); |
| 57 |
| 58 buffer.write("\n"); |
| 59 var textLine = text.split("\n").first; |
| 60 if (color != null) buffer.write(color); |
| 61 buffer.write(textLine); |
| 62 buffer.write("\n"); |
| 63 buffer.write('^' * textLine.length); |
| 64 if (color != null) buffer.write(colors.NONE); |
| 65 return buffer.toString(); |
| 66 } |
| 67 |
| 68 bool operator ==(SourceSpan other) => |
| 69 start == other.start && end == other.end; |
| 70 |
| 71 int get hashCode => start.hashCode + (31 * end.hashCode); |
| 72 |
| 73 String toString() => '<$runtimeType: from $start to $end "$text">'; |
| 74 } |
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