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Issue 9695048: Template parser (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Siggi's comments Created 8 years, 9 months ago
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1 // Copyright (c) 2011, 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 // TODO(jimhug): This should be an interface to work better with tools.
6 /**
7 * Represents a file of source code.
8 */
9 class SourceFile implements Comparable {
10 // TODO(terry): This filename for in memory buffer. May need to rework if
11 // filename is used for more than informational.
12 static String IN_MEMORY_FILE = '<buffer>';
13
14 /** The name of the file. */
15 final String filename;
16
17 /** The text content of the file. */
18 String _text;
19
20 /**
21 * The order of the source file in a given library. This is used while we're
22 * writing code for a library. A single source file can be used
23 */
24 // TODO(jmesserly): I don't like having properties that are only valid
25 // sometimes. An alternative would be to store it in a Map that's used by
26 // WorldGenerator while it's emitting code. This seems simpler.
27 int orderInLibrary;
28
29 List<int> _lineStarts;
30
31 SourceFile(this.filename, this._text);
32
33 String get text() => _text;
34
35 set text(String newText) {
36 if (newText != _text) {
37 _text = newText;
38 _lineStarts = null;
39 orderInLibrary = null;
40 }
41 }
42
43 List<int> get lineStarts() {
44 if (_lineStarts == null) {
45 var starts = [0];
46 var index = 0;
47 while (index < text.length) {
48 index = text.indexOf('\n', index) + 1;
49 if (index <= 0) break;
50 starts.add(index);
51 }
52 starts.add(text.length + 1);
53 _lineStarts = starts;
54 }
55 return _lineStarts;
56 }
57
58 int getLine(int position) {
59 // TODO(jimhug): Implement as binary search.
60 var starts = lineStarts;
61 for (int i=0; i < starts.length; i++) {
62 if (starts[i] > position) return i-1;
63 }
64 world.internalError('bad position');
65 }
66
67 int getColumn(int line, int position) {
68 return position - lineStarts[line];
69 }
70
71 /**
72 * Create a pretty string representation from a character position
73 * in the file.
74 */
75 String getLocationMessage(String message, int start,
76 [int end, bool includeText=false]) {
77 var line = getLine(start);
78 var column = getColumn(line, start);
79
80 var buf = new StringBuffer(
81 '${filename}:${line + 1}:${column + 1}: $message');
82 if (includeText) {
83 buf.add('\n');
84 var textLine;
85 // +1 for 0-indexing, +1 again to avoid the last line of the file
86 if ((line + 2) < _lineStarts.length) {
87 textLine = text.substring(_lineStarts[line], _lineStarts[line+1]);
88 } else {
89 textLine = text.substring(_lineStarts[line]) + '\n';
90 }
91
92 int toColumn = Math.min(column + (end-start), textLine.length);
93 if (options.useColors) {
94 buf.add(textLine.substring(0, column));
95 buf.add(_RED_COLOR);
96 buf.add(textLine.substring(column, toColumn));
97 buf.add(_NO_COLOR);
98 buf.add(textLine.substring(toColumn));
99 } else {
100 buf.add(textLine);
101 }
102
103 int i = 0;
104 for (; i < column; i++) {
105 buf.add(' ');
106 }
107
108 if (options.useColors) buf.add(_RED_COLOR);
109 for (; i < toColumn; i++) {
110 buf.add('^');
111 }
112 if (options.useColors) buf.add(_NO_COLOR);
113 }
114
115 return buf.toString();
116 }
117
118 /** Compares two source files. */
119 int compareTo(SourceFile other) {
120 if (orderInLibrary != null && other.orderInLibrary != null) {
121 return orderInLibrary - other.orderInLibrary;
122 } else {
123 return filename.compareTo(other.filename);
124 }
125 }
126 }
127
128
129 /**
130 * A range of characters in a [SourceFile]. Used to represent the source
131 * positions of [Token]s and [Node]s for error reporting or other tooling
132 * work.
133 */
134 // TODO(jmesserly): Rename to Span - but first write cool refactoring tool
135 class SourceSpan implements Comparable {
136 /** The [SourceFile] that contains this span. */
137 final SourceFile file;
138
139 /** The character position of the start of this span. */
140 final int start;
141
142 /** The character position of the end of this span. */
143 final int end;
144
145 SourceSpan(this.file, this.start, this.end);
146
147 /** Returns the source text corresponding to this [Span]. */
148 String get text() {
149 return file.text.substring(start, end);
150 }
151
152 toMessageString(String message) {
153 return file.getLocationMessage(message, start, end: end, includeText: true);
154 }
155
156 int get line() {
157 return file.getLine(start);
158 }
159
160 int get column() {
161 return file.getColumn(line, start);
162 }
163
164 int get endLine() {
165 return file.getLine(end);
166 }
167
168 int get endColumn() {
169 return file.getColumn(endLine, end);
170 }
171
172 String get locationText() {
173 var line = file.getLine(start);
174 var column = file.getColumn(line, start);
175 return '${file.filename}:${line + 1}:${column + 1}';
176 }
177
178 /** Compares two source spans by file and position. Handles nulls. */
179 int compareTo(SourceSpan other) {
180 if (file == other.file) {
181 int d = start - other.start;
182 return d == 0 ? (end - other.end) : d;
183 }
184 return file.compareTo(other.file);
185 }
186 }
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