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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 trydart.source_update; | |
| 6 | |
| 7 /// Returns [updates] expanded to full compilation units/source files. | |
| 8 /// | |
| 9 /// [updates] is a convenient way to write updates/patches to a single source | |
| 10 /// file without repeating common parts. | |
| 11 /// | |
| 12 /// For example: | |
| 13 /// ["head ", ["v1", "v2"], " tail"] | |
| 14 /// expands to: | |
| 15 /// ["head v1 tail", "head v2 tail"] | |
| 16 List<String> expandUpdates(List updates) { | |
| 17 int outputCount = updates.firstWhere((e) => e is Iterable).length; | |
| 18 List<StringBuffer> result = new List<StringBuffer>(outputCount); | |
| 19 for (int i = 0; i < outputCount; i++) { | |
| 20 result[i] = new StringBuffer(); | |
| 21 } | |
| 22 for (var chunk in updates) { | |
| 23 if (chunk is Iterable) { | |
| 24 int segmentCount = 0; | |
| 25 for (var segment in chunk) { | |
| 26 result[segmentCount++].write(segment); | |
| 27 } | |
| 28 if (segmentCount != outputCount) { | |
| 29 throw new ArgumentError( | |
| 30 "Expected ${outputCount} segments, " | |
| 31 "but found ${segmentCount} in $chunk"); | |
| 32 } | |
| 33 } else { | |
| 34 for (StringBuffer buffer in result) { | |
| 35 buffer.write(chunk); | |
| 36 } | |
| 37 } | |
| 38 } | |
| 39 | |
| 40 return result.map((e) => '$e').toList(); | |
| 41 } | |
| 42 | |
| 43 /// Returns [files] split into multiple named files. The keys in the returned | |
| 44 /// map are filenames, the values are the files' content. | |
| 45 /// | |
| 46 /// Names are indicated by a line on the form "==> filename <==". Spaces are | |
| 47 /// significant. For example, given this input: | |
| 48 /// | |
| 49 /// ==> file1.dart <== | |
| 50 /// First line of file 1. | |
| 51 /// Second line of file 1. | |
| 52 /// Third line of file 1. | |
| 53 /// ==> empty.dart <== | |
| 54 /// ==> file2.dart <== | |
| 55 /// First line of file 2. | |
| 56 /// Second line of file 2. | |
| 57 /// Third line of file 2. | |
| 58 /// | |
| 59 /// This function would return: | |
| 60 /// | |
| 61 /// { | |
| 62 /// "file1.dart": """ | |
| 63 /// First line of file 1. | |
| 64 /// Second line of file 1. | |
| 65 /// Third line of file 1. | |
| 66 /// """, | |
| 67 /// | |
| 68 /// "empty.dart":"", | |
| 69 /// | |
| 70 /// "file2.dart":""" | |
| 71 /// First line of file 2. | |
| 72 /// Second line of file 2. | |
| 73 /// Third line of file 2. | |
| 74 /// """ | |
| 75 /// } | |
| 76 Map<String, String> splitFiles(String files) { | |
| 77 Map<String, String> result = <String, String>{}; | |
| 78 String currentName; | |
| 79 List<String> content; | |
| 80 void finishFile() { | |
| 81 if (currentName != null) { | |
| 82 if (result.containsKey(currentName)) { | |
| 83 throw new ArgumentError("Duplicated filename $currentName in $files"); | |
| 84 } | |
| 85 result[currentName] = content.join(''); | |
| 86 } | |
| 87 content = null; | |
| 88 } | |
| 89 void processDirective(String line) { | |
| 90 finishFile(); | |
| 91 if (line.length < 8 || !line.endsWith(" <==\n")) { | |
| 92 throw new ArgumentError( | |
| 93 "Malformed line: expected '==> ... <==', but got: '$line'"); | |
| 94 } | |
| 95 currentName = line.substring(4, line.length - 5); | |
| 96 content = <String>[]; | |
| 97 } | |
| 98 for (String line in splitLines(files)) { | |
| 99 if (line.startsWith("==>")) { | |
| 100 processDirective(line); | |
| 101 } else { | |
| 102 content.add(line); | |
| 103 } | |
| 104 } | |
| 105 finishFile(); | |
| 106 return result; | |
| 107 } | |
| 108 | |
| 109 /// Split [text] into lines preserving trailing newlines (unlike | |
| 110 /// String.split("\n"). Also, if [text] is empty, return an empty list (unlike | |
| 111 /// String.split("\n")). | |
| 112 List<String> splitLines(String text) { | |
| 113 return text.split(new RegExp('^', multiLine: true)); | |
| 114 } | |
| 115 | |
| 116 /// Expand a file with diffs in common merge conflict format into a [List] that | |
| 117 /// can be passed to [expandUpdates]. | |
| 118 /// | |
| 119 /// For example: | |
| 120 /// first | |
| 121 /// <<<<<<< | |
| 122 /// v1 | |
| 123 /// ======= | |
| 124 /// v2 | |
| 125 /// ======= | |
| 126 /// v3 | |
| 127 /// >>>>>>> | |
| 128 /// last | |
| 129 /// | |
| 130 /// Would be expanded to something equivalent to: | |
| 131 /// | |
| 132 /// ["first\n", ["v1\n", "v2\n", "v3\n"], "last\n"] | |
| 133 List expandDiff(String text) { | |
| 134 List result = [new StringBuffer()]; | |
| 135 bool inDiff = false; | |
| 136 for (String line in splitLines(text)) { | |
| 137 if (inDiff) { | |
| 138 if (line.startsWith("=======")) { | |
| 139 result.last.add(new StringBuffer()); | |
| 140 } else if (line.startsWith(">>>>>>>")) { | |
| 141 inDiff = false; | |
| 142 result.add(new StringBuffer()); | |
| 143 } else { | |
| 144 result.last.last.write(line); | |
| 145 } | |
| 146 } else if (line.startsWith("<<<<<<<")) { | |
| 147 inDiff = true; | |
| 148 result.add(<StringBuffer>[new StringBuffer()]); | |
| 149 } else { | |
| 150 result.last.write(line); | |
| 151 } | |
| 152 } | |
| 153 return result; | |
| 154 } | |
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