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-rw-r--r--src/3rdparty/angle/src/compiler/preprocessor/new/numeric_lex.h61
1 files changed, 61 insertions, 0 deletions
diff --git a/src/3rdparty/angle/src/compiler/preprocessor/new/numeric_lex.h b/src/3rdparty/angle/src/compiler/preprocessor/new/numeric_lex.h
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+++ b/src/3rdparty/angle/src/compiler/preprocessor/new/numeric_lex.h
@@ -0,0 +1,61 @@
+//
+// Copyright (c) 2012 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+// numeric_lex.h: Functions to extract numeric values from string.
+
+#ifndef COMPILER_PREPROCESSOR_NUMERIC_LEX_H_
+#define COMPILER_PREPROCESSOR_NUMERIC_LEX_H_
+
+#include <sstream>
+
+namespace pp {
+
+inline std::ios::fmtflags numeric_base_int(const std::string& str)
+{
+ if ((str.size() >= 2) &&
+ (str[0] == '0') &&
+ (str[1] == 'x' || str[1] == 'X'))
+ {
+ return std::ios::hex;
+ }
+ else if ((str.size() >= 1) && (str[0] == '0'))
+ {
+ return std::ios::oct;
+ }
+ return std::ios::dec;
+}
+
+// The following functions parse the given string to extract a numerical
+// value of the given type. These functions assume that the string is
+// of the correct form. They can only fail if the parsed value is too big,
+// in which case false is returned.
+
+template<typename IntType>
+bool numeric_lex_int(const std::string& str, IntType* value)
+{
+ std::istringstream stream(str);
+ // This should not be necessary, but MSVS has a buggy implementation.
+ // It returns incorrect results if the base is not specified.
+ stream.setf(numeric_base_int(str), std::ios::basefield);
+
+ stream >> (*value);
+ return !stream.fail();
+}
+
+template<typename FloatType>
+bool numeric_lex_float(const std::string& str, FloatType* value)
+{
+ std::istringstream stream(str);
+ // Force "C" locale so that decimal character is always '.', and
+ // not dependent on the current locale.
+ stream.imbue(std::locale::classic());
+
+ stream >> (*value);
+ return !stream.fail();
+}
+
+} // namespace pp.
+#endif // COMPILER_PREPROCESSOR_NUMERIC_LEX_H_