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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 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. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 part of yaml; | 5 part of yaml; |
6 | 6 |
7 /// Takes a parsed YAML document (what the spec calls the "serialization tree") | 7 /// Takes a parsed YAML document (what the spec calls the "serialization tree") |
8 /// and resolves aliases, resolves tags, and parses scalars to produce the | 8 /// and resolves aliases, resolves tags, and parses scalars to produce the |
9 /// "representation graph". | 9 /// "representation graph". |
10 class _Composer extends _Visitor { | 10 class _Composer extends _Visitor { |
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113 /// Parses an integer scalar. | 113 /// Parses an integer scalar. |
114 _ScalarNode parseInt(String content) { | 114 _ScalarNode parseInt(String content) { |
115 var match = new RegExp("^[-+]?[0-9]+\$").firstMatch(content); | 115 var match = new RegExp("^[-+]?[0-9]+\$").firstMatch(content); |
116 if (match != null) { | 116 if (match != null) { |
117 return new _ScalarNode(_Tag.yaml("int"), | 117 return new _ScalarNode(_Tag.yaml("int"), |
118 value: int.parse(match.group(0))); | 118 value: int.parse(match.group(0))); |
119 } | 119 } |
120 | 120 |
121 match = new RegExp("^0o([0-7]+)\$").firstMatch(content); | 121 match = new RegExp("^0o([0-7]+)\$").firstMatch(content); |
122 if (match != null) { | 122 if (match != null) { |
123 // TODO(nweiz): clean this up when Dart can parse an octal string | 123 int n = int.parse(match.group(1), radix: 8); |
124 var n = 0; | |
125 for (var c in match.group(1).charCodes) { | |
126 n *= 8; | |
127 n += c - 48; | |
128 } | |
129 return new _ScalarNode(_Tag.yaml("int"), value: n); | 124 return new _ScalarNode(_Tag.yaml("int"), value: n); |
130 } | 125 } |
131 | 126 |
132 match = new RegExp("^0x[0-9a-fA-F]+\$").firstMatch(content); | 127 match = new RegExp("^0x[0-9a-fA-F]+\$").firstMatch(content); |
133 if (match != null) { | 128 if (match != null) { |
134 return new _ScalarNode(_Tag.yaml("int"), | 129 return new _ScalarNode(_Tag.yaml("int"), |
135 value: int.parse(match.group(0))); | 130 value: int.parse(match.group(0))); |
136 } | 131 } |
137 | 132 |
138 return null; | 133 return null; |
139 } | 134 } |
140 | 135 |
141 /// Parses a floating-point scalar. | 136 /// Parses a floating-point scalar. |
142 _ScalarNode parseFloat(String content) { | 137 _ScalarNode parseFloat(String content) { |
143 var match = new RegExp( | 138 var match = new RegExp( |
144 "^[-+]?(\.[0-9]+|[0-9]+(\.[0-9]*)?)([eE][-+]?[0-9]+)?\$"). | 139 "^[-+]?(\.[0-9]+|[0-9]+(\.[0-9]*)?)([eE][-+]?[0-9]+)?\$"). |
145 firstMatch(content); | 140 firstMatch(content); |
146 if (match != null) { | 141 if (match != null) { |
147 // YAML allows floats of the form "0.", but Dart does not. Fix up those | 142 // YAML allows floats of the form "0.", but Dart does not. Fix up those |
148 // floats by removing the trailing dot. | 143 // floats by removing the trailing dot. |
149 var matchStr = match.group(0).replaceAll(new RegExp(r"\.$"), ""); | 144 var matchStr = match.group(0).replaceAll(new RegExp(r"\.$"), ""); |
150 return new _ScalarNode(_Tag.yaml("float"), | 145 return new _ScalarNode(_Tag.yaml("float"), |
151 value: double.parse(matchStr)); | 146 value: double.parse(matchStr)); |
152 } | 147 } |
153 | 148 |
154 match = new RegExp("^([+-]?)\.(inf|Inf|INF)\$").firstMatch(content); | 149 match = new RegExp("^([+-]?)\.(inf|Inf|INF)\$").firstMatch(content); |
155 if (match != null) { | 150 if (match != null) { |
156 var infinityStr = match.group(1) == "-" ? "-Infinity" : "Infinity"; | 151 var value = match.group(1) == "-" ? -double.INFINITY : double.INFINITY; |
157 return new _ScalarNode(_Tag.yaml("float"), | 152 return new _ScalarNode(_Tag.yaml("float"), value: value); |
158 value: double.parse(infinityStr)); | |
159 } | 153 } |
160 | 154 |
161 match = new RegExp("^\.(nan|NaN|NAN)\$").firstMatch(content); | 155 match = new RegExp("^\.(nan|NaN|NAN)\$").firstMatch(content); |
162 if (match != null) { | 156 if (match != null) { |
163 return new _ScalarNode(_Tag.yaml("float"), | 157 return new _ScalarNode(_Tag.yaml("float"), value: double.NAN); |
164 value: double.parse("NaN")); | |
165 } | 158 } |
166 | 159 |
167 return null; | 160 return null; |
168 } | 161 } |
169 | 162 |
170 /// Parses a string scalar. | 163 /// Parses a string scalar. |
171 _ScalarNode parseString(String content) => | 164 _ScalarNode parseString(String content) => |
172 new _ScalarNode(_Tag.yaml("str"), value: content); | 165 new _ScalarNode(_Tag.yaml("str"), value: content); |
173 } | 166 } |
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