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| 1 // Copyright (c) 2015, 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 package_config.packages_file; | |
| 6 | |
| 7 import "package:charcode/ascii.dart"; | |
| 8 import "src/util.dart" show isValidPackageName; | |
| 9 | |
| 10 /// Parses a `.packages` file into a map from package name to base URI. | |
| 11 /// | |
| 12 /// The [source] is the byte content of a `.packages` file, assumed to be | |
| 13 /// UTF-8 encoded. In practice, all significant parts of the file must be ASCII, | |
| 14 /// so Latin-1 or Windows-1252 encoding will also work fine. | |
| 15 /// | |
| 16 /// If the file content is available as a string, its [String.codeUnits] can | |
| 17 /// be used as the `source` argument of this function. | |
| 18 /// | |
| 19 /// The [baseLocation] is used as a base URI to resolve all relative | |
| 20 /// URI references against. | |
| 21 /// If the content was read from a file, `baseLocation` should be the | |
| 22 /// location of that file. | |
| 23 /// | |
| 24 /// Returns a simple mapping from package name to package location. | |
| 25 Map<String, Uri> parse(List<int> source, Uri baseLocation) { | |
| 26 int index = 0; | |
| 27 Map<String, Uri> result = <String, Uri>{}; | |
| 28 while (index < source.length) { | |
| 29 bool isComment = false; | |
| 30 int start = index; | |
| 31 int separatorIndex = -1; | |
| 32 int end = source.length; | |
| 33 int char = source[index++]; | |
| 34 if (char == $cr || char == $lf) { | |
| 35 continue; | |
| 36 } | |
| 37 if (char == $colon) { | |
| 38 throw new FormatException("Missing package name", source, index - 1); | |
| 39 } | |
| 40 isComment = char == $hash; | |
| 41 while (index < source.length) { | |
| 42 char = source[index++]; | |
| 43 if (char == $colon && separatorIndex < 0) { | |
| 44 separatorIndex = index - 1; | |
| 45 } else if (char == $cr || char == $lf) { | |
| 46 end = index - 1; | |
| 47 break; | |
| 48 } | |
| 49 } | |
| 50 if (isComment) continue; | |
| 51 if (separatorIndex < 0) { | |
| 52 throw new FormatException("No ':' on line", source, index - 1); | |
| 53 } | |
| 54 var packageName = new String.fromCharCodes(source, start, separatorIndex); | |
| 55 if (!isValidPackageName(packageName)) { | |
| 56 throw new FormatException("Not a valid package name", packageName, 0); | |
| 57 } | |
| 58 var packageUri = new String.fromCharCodes(source, separatorIndex + 1, end); | |
| 59 var packageLocation = Uri.parse(packageUri); | |
| 60 packageLocation = baseLocation.resolveUri(packageLocation); | |
| 61 if (!packageLocation.path.endsWith('/')) { | |
| 62 packageLocation = | |
| 63 packageLocation.replace(path: packageLocation.path + "/"); | |
| 64 } | |
| 65 if (result.containsKey(packageName)) { | |
| 66 throw new FormatException( | |
| 67 "Same package name occured twice.", source, start); | |
| 68 } | |
| 69 result[packageName] = packageLocation; | |
| 70 } | |
| 71 return result; | |
| 72 } | |
| 73 | |
| 74 /// Writes the mapping to a [StringSink]. | |
| 75 /// | |
| 76 /// If [comment] is provided, the output will contain this comment | |
| 77 /// with `# ` in front of each line. | |
| 78 /// Lines are defined as ending in line feed (`'\n'`). If the final | |
| 79 /// line of the comment doesn't end in a line feed, one will be added. | |
| 80 /// | |
| 81 /// If [baseUri] is provided, package locations will be made relative | |
| 82 /// to the base URI, if possible, before writing. | |
| 83 /// | |
| 84 /// All the keys of [packageMapping] must be valid package names, | |
| 85 /// and the values must be URIs that do not have the `package:` scheme. | |
| 86 void write(StringSink output, Map<String, Uri> packageMapping, | |
| 87 {Uri baseUri, String comment}) { | |
| 88 if (baseUri != null && !baseUri.isAbsolute) { | |
| 89 throw new ArgumentError.value(baseUri, "baseUri", "Must be absolute"); | |
| 90 } | |
| 91 | |
| 92 if (comment != null) { | |
| 93 var lines = comment.split('\n'); | |
| 94 if (lines.last.isEmpty) lines.removeLast(); | |
| 95 for (var commentLine in lines) { | |
| 96 output.write('# '); | |
| 97 output.writeln(commentLine); | |
| 98 } | |
| 99 } else { | |
| 100 output.write("# generated by package:package_config at "); | |
| 101 output.write(new DateTime.now()); | |
| 102 output.writeln(); | |
| 103 } | |
| 104 | |
| 105 packageMapping.forEach((String packageName, Uri uri) { | |
| 106 // Validate packageName. | |
| 107 if (!isValidPackageName(packageName)) { | |
| 108 throw new ArgumentError('"$packageName" is not a valid package name'); | |
| 109 } | |
| 110 if (uri.scheme == "package") { | |
| 111 throw new ArgumentError.value( | |
| 112 "Package location must not be a package: URI", uri.toString()); | |
| 113 } | |
| 114 output.write(packageName); | |
| 115 output.write(':'); | |
| 116 // If baseUri provided, make uri relative. | |
| 117 if (baseUri != null) { | |
| 118 uri = _relativize(uri, baseUri); | |
| 119 } | |
| 120 output.write(uri); | |
| 121 if (!uri.path.endsWith('/')) { | |
| 122 output.write('/'); | |
| 123 } | |
| 124 output.writeln(); | |
| 125 }); | |
| 126 } | |
| 127 | |
| 128 /// Attempts to return a relative URI for [uri]. | |
| 129 /// | |
| 130 /// The result URI satisfies `baseUri.resolveUri(result) == uri`, | |
| 131 /// but may be relative. | |
| 132 /// The `baseUri` must be absolute. | |
| 133 Uri _relativize(Uri uri, Uri baseUri) { | |
| 134 assert(baseUri.isAbsolute); | |
| 135 if (uri.hasQuery || uri.hasFragment) { | |
| 136 uri = new Uri( | |
| 137 scheme: uri.scheme, | |
| 138 userInfo: uri.hasAuthority ? uri.userInfo : null, | |
| 139 host: uri.hasAuthority ? uri.host : null, | |
| 140 port: uri.hasAuthority ? uri.port : null, | |
| 141 path: uri.path); | |
| 142 } | |
| 143 | |
| 144 // Already relative. We assume the caller knows what they are doing. | |
| 145 if (!uri.isAbsolute) return uri; | |
| 146 | |
| 147 if (baseUri.scheme != uri.scheme) { | |
| 148 return uri; | |
| 149 } | |
| 150 | |
| 151 // If authority differs, we could remove the scheme, but it's not worth it. | |
| 152 if (uri.hasAuthority != baseUri.hasAuthority) return uri; | |
| 153 if (uri.hasAuthority) { | |
| 154 if (uri.userInfo != baseUri.userInfo || | |
| 155 uri.host.toLowerCase() != baseUri.host.toLowerCase() || | |
| 156 uri.port != baseUri.port) { | |
| 157 return uri; | |
| 158 } | |
| 159 } | |
| 160 | |
| 161 baseUri = _normalizePath(baseUri); | |
| 162 List<String> base = baseUri.pathSegments.toList(); | |
| 163 if (base.isNotEmpty) { | |
| 164 base = new List<String>.from(base)..removeLast(); | |
| 165 } | |
| 166 uri = _normalizePath(uri); | |
| 167 List<String> target = uri.pathSegments.toList(); | |
| 168 if (target.isNotEmpty && target.last.isEmpty) target.removeLast(); | |
| 169 int index = 0; | |
| 170 while (index < base.length && index < target.length) { | |
| 171 if (base[index] != target[index]) { | |
| 172 break; | |
| 173 } | |
| 174 index++; | |
| 175 } | |
| 176 if (index == base.length) { | |
| 177 if (index == target.length) { | |
| 178 return new Uri(path: "./"); | |
| 179 } | |
| 180 return new Uri(path: target.skip(index).join('/')); | |
| 181 } else if (index > 0) { | |
| 182 return new Uri( | |
| 183 path: '../' * (base.length - index) + target.skip(index).join('/')); | |
| 184 } else { | |
| 185 return uri; | |
| 186 } | |
| 187 } | |
| 188 | |
| 189 // TODO: inline to uri.normalizePath() when we move to 1.11 | |
| 190 Uri _normalizePath(Uri uri) => new Uri().resolveUri(uri); | |
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Chromium Code Reviews
Issue 1400473008:
Roll Observatory packages and add a roll script (Closed)
Base URL: git@github.com:dart-lang/observatory_pub_packages.git@master