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comparison: gfx/angle/src/compiler/preprocessor/numeric_lex.h
gfx/angle/src/compiler/preprocessor/numeric_lex.h
- branch
- TOR_BUG_9701
- changeset 3
- 141e0f1194b1
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| -1:000000000000 | 0:208cf4270572 |
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| 1 // | |
| 2 // Copyright (c) 2012 The ANGLE Project Authors. All rights reserved. | |
| 3 // Use of this source code is governed by a BSD-style license that can be | |
| 4 // found in the LICENSE file. | |
| 5 // | |
| 6 | |
| 7 // numeric_lex.h: Functions to extract numeric values from string. | |
| 8 | |
| 9 #ifndef COMPILER_PREPROCESSOR_NUMERIC_LEX_H_ | |
| 10 #define COMPILER_PREPROCESSOR_NUMERIC_LEX_H_ | |
| 11 | |
| 12 #include <sstream> | |
| 13 | |
| 14 namespace pp { | |
| 15 | |
| 16 inline std::ios::fmtflags numeric_base_int(const std::string& str) | |
| 17 { | |
| 18 if ((str.size() >= 2) && | |
| 19 (str[0] == '0') && | |
| 20 (str[1] == 'x' || str[1] == 'X')) | |
| 21 { | |
| 22 return std::ios::hex; | |
| 23 } | |
| 24 else if ((str.size() >= 1) && (str[0] == '0')) | |
| 25 { | |
| 26 return std::ios::oct; | |
| 27 } | |
| 28 return std::ios::dec; | |
| 29 } | |
| 30 | |
| 31 // The following functions parse the given string to extract a numerical | |
| 32 // value of the given type. These functions assume that the string is | |
| 33 // of the correct form. They can only fail if the parsed value is too big, | |
| 34 // in which case false is returned. | |
| 35 | |
| 36 template<typename IntType> | |
| 37 bool numeric_lex_int(const std::string& str, IntType* value) | |
| 38 { | |
| 39 std::istringstream stream(str); | |
| 40 // This should not be necessary, but MSVS has a buggy implementation. | |
| 41 // It returns incorrect results if the base is not specified. | |
| 42 stream.setf(numeric_base_int(str), std::ios::basefield); | |
| 43 | |
| 44 stream >> (*value); | |
| 45 return !stream.fail(); | |
| 46 } | |
| 47 | |
| 48 template<typename FloatType> | |
| 49 bool numeric_lex_float(const std::string& str, FloatType* value) | |
| 50 { | |
| 51 std::istringstream stream(str); | |
| 52 // Force "C" locale so that decimal character is always '.', and | |
| 53 // not dependent on the current locale. | |
| 54 stream.imbue(std::locale::classic()); | |
| 55 | |
| 56 stream >> (*value); | |
| 57 return !stream.fail(); | |
| 58 } | |
| 59 | |
| 60 } // namespace pp. | |
| 61 #endif // COMPILER_PREPROCESSOR_NUMERIC_LEX_H_ |
