import from github

tools/preproc/char_util.h

@@ -0,0 +1,71 @@
+// Copyright(c) 2016 YamaArashi
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#ifndef CHAR_UTIL_H
+#define CHAR_UTIL_H
+
+#include <cstdint>
+#include <cassert>
+
+inline bool IsAscii(unsigned char c)
+{
+    return (c < 128);
+}
+
+inline bool IsAsciiAlpha(unsigned char c)
+{
+    return ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'));
+}
+
+inline bool IsAsciiDigit(unsigned char c)
+{
+    return (c >= '0' && c <= '9');
+}
+
+inline bool IsAsciiHexDigit(unsigned char c)
+{
+    return ((c >= '0' && c <= '9')
+        || (c >= 'a' && c <= 'f')
+        || (c >= 'A' && c <= 'F'));
+}
+
+inline bool IsAsciiAlphanum(unsigned char c)
+{
+    return (IsAsciiAlpha(c) || IsAsciiDigit(c));
+}
+
+inline bool IsAsciiPrintable(unsigned char c)
+{
+    return (c >= ' ' && c <= '~');
+}
+
+// Returns whether the character can start a C identifier or the identifier of a "{FOO}" constant in strings.
+inline bool IsIdentifierStartingChar(unsigned char c)
+{
+    return IsAsciiAlpha(c) || c == '_';
+}
+
+// Returns whether the character can be used in a C identifier or the identifier of a "{FOO}" constant in strings.
+inline bool IsIdentifierChar(unsigned char c)
+{
+    return IsAsciiAlphanum(c) || c == '_';
+}
+
+#endif // CHAR_UTIL_H