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1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file | 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 | 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 #library('Peg Parser'); | 5 #library('Peg Parser'); |
6 | 6 |
7 /* | 7 /* |
8 * The following functions are combinators for building Rules. | 8 * The following functions are combinators for building Rules. |
9 * | 9 * |
10 * A rule is one of the following | 10 * A rule is one of the following |
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55 * CHAR does not generate a value. | 55 * CHAR does not generate a value. |
56 */ | 56 */ |
57 _Rule CHAR([characters]) { | 57 _Rule CHAR([characters]) { |
58 if (characters == null) | 58 if (characters == null) |
59 return const _AnyCharRule(); | 59 return const _AnyCharRule(); |
60 if (characters is int) | 60 if (characters is int) |
61 return CHARCODE(characters); | 61 return CHARCODE(characters); |
62 | 62 |
63 // Find the range of character codes and construct an array of flags for codes | 63 // Find the range of character codes and construct an array of flags for codes |
64 // within the range. | 64 // within the range. |
65 List<int> codes = characters.charCodes(); | 65 List<int> codes = characters.charCodes; |
66 codes.sort((a, b) => a < b ? -1 : a > b ? 1 : 0); | 66 codes.sort((a, b) => a < b ? -1 : a > b ? 1 : 0); |
67 int lo = codes[0]; | 67 int lo = codes[0]; |
68 int hi = codes[codes.length - 1]; | 68 int hi = codes[codes.length - 1]; |
69 if (lo == hi) | 69 if (lo == hi) |
70 return CHARCODE(lo); | 70 return CHARCODE(lo); |
71 int len = hi - lo + 1; | 71 int len = hi - lo + 1; |
72 var flags = new List<bool>(len); | 72 var flags = new List<bool>(len); |
73 for (int i = 0; i < len; ++i) | 73 for (int i = 0; i < len; ++i) |
74 flags[i] = false; | 74 flags[i] = false; |
75 for (int code in codes) | 75 for (int code in codes) |
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849 add(s); | 849 add(s); |
850 add(t); | 850 add(t); |
851 add(u); | 851 add(u); |
852 add(v); | 852 add(v); |
853 add(w); | 853 add(w); |
854 add(x); | 854 add(x); |
855 add(y); | 855 add(y); |
856 add(z); | 856 add(z); |
857 return list; | 857 return list; |
858 } | 858 } |
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