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Diffstat (limited to 'include/clang/Basic/CharInfo.h')
| -rw-r--r-- | include/clang/Basic/CharInfo.h | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/include/clang/Basic/CharInfo.h b/include/clang/Basic/CharInfo.h new file mode 100644 index 0000000..d0afda4 --- /dev/null +++ b/include/clang/Basic/CharInfo.h @@ -0,0 +1,198 @@ +//===--- clang/Basic/CharInfo.h - Classifying ASCII Characters ------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +#ifndef CLANG_BASIC_CHARINFO_H +#define CLANG_BASIC_CHARINFO_H + +#include "clang/Basic/LLVM.h" +#include "llvm/ADT/StringRef.h" +#include "llvm/Support/Compiler.h" +#include "llvm/Support/DataTypes.h" + +namespace clang { +namespace charinfo { + extern const uint16_t InfoTable[256]; + + enum { + CHAR_HORZ_WS = 0x0001, // '\t', '\f', '\v'. Note, no '\0' + CHAR_VERT_WS = 0x0002, // '\r', '\n' + CHAR_SPACE = 0x0004, // ' ' + CHAR_DIGIT = 0x0008, // 0-9 + CHAR_XLETTER = 0x0010, // a-f,A-F + CHAR_UPPER = 0x0020, // A-Z + CHAR_LOWER = 0x0040, // a-z + CHAR_UNDER = 0x0080, // _ + CHAR_PERIOD = 0x0100, // . + CHAR_RAWDEL = 0x0200, // {}[]#<>%:;?*+-/^&|~!=,"' + CHAR_PUNCT = 0x0400 // `$@() + }; + + enum { + CHAR_XUPPER = CHAR_XLETTER | CHAR_UPPER, + CHAR_XLOWER = CHAR_XLETTER | CHAR_LOWER + }; +} // end namespace charinfo + +/// Returns true if this is an ASCII character. +LLVM_READNONE static inline bool isASCII(char c) { + return static_cast<unsigned char>(c) <= 127; +} + +/// Returns true if this is a valid first character of a C identifier, +/// which is [a-zA-Z_]. +LLVM_READONLY static inline bool isIdentifierHead(unsigned char c, + bool AllowDollar = false) { + using namespace charinfo; + if (InfoTable[c] & (CHAR_UPPER|CHAR_LOWER|CHAR_UNDER)) + return true; + return AllowDollar && c == '$'; +} + +/// Returns true if this is a body character of a C identifier, +/// which is [a-zA-Z0-9_]. +LLVM_READONLY static inline bool isIdentifierBody(unsigned char c, + bool AllowDollar = false) { + using namespace charinfo; + if (InfoTable[c] & (CHAR_UPPER|CHAR_LOWER|CHAR_DIGIT|CHAR_UNDER)) + return true; + return AllowDollar && c == '$'; +} + +/// Returns true if this character is horizontal ASCII whitespace: +/// ' ', '\\t', '\\f', '\\v'. +/// +/// Note that this returns false for '\\0'. +LLVM_READONLY static inline bool isHorizontalWhitespace(unsigned char c) { + using namespace charinfo; + return (InfoTable[c] & (CHAR_HORZ_WS|CHAR_SPACE)) != 0; +} + +/// Returns true if this character is vertical ASCII whitespace: '\\n', '\\r'. +/// +/// Note that this returns false for '\\0'. +LLVM_READONLY static inline bool isVerticalWhitespace(unsigned char c) { + using namespace charinfo; + return (InfoTable[c] & CHAR_VERT_WS) != 0; +} + +/// Return true if this character is horizontal or vertical ASCII whitespace: +/// ' ', '\\t', '\\f', '\\v', '\\n', '\\r'. +/// +/// Note that this returns false for '\\0'. +LLVM_READONLY static inline bool isWhitespace(unsigned char c) { + using namespace charinfo; + return (InfoTable[c] & (CHAR_HORZ_WS|CHAR_VERT_WS|CHAR_SPACE)) != 0; +} + +/// Return true if this character is an ASCII digit: [0-9] +LLVM_READONLY static inline bool isDigit(unsigned char c) { + using namespace charinfo; + return (InfoTable[c] & CHAR_DIGIT) != 0; +} + +/// Return true if this character is a lowercase ASCII letter: [a-z] +LLVM_READONLY static inline bool isLowercase(unsigned char c) { + using namespace charinfo; + return (InfoTable[c] & CHAR_LOWER) != 0; +} + +/// Return true if this character is an uppercase ASCII letter: [A-Z] +LLVM_READONLY static inline bool isUppercase(unsigned char c) { + using namespace charinfo; + return (InfoTable[c] & CHAR_UPPER) != 0; +} + +/// Return true if this character is an ASCII letter: [a-zA-Z] +LLVM_READONLY static inline bool isLetter(unsigned char c) { + using namespace charinfo; + return (InfoTable[c] & (CHAR_UPPER|CHAR_LOWER)) != 0; +} + +/// Return true if this character is an ASCII letter or digit: [a-zA-Z0-9] +LLVM_READONLY static inline bool isAlphanumeric(unsigned char c) { + using namespace charinfo; + return (InfoTable[c] & (CHAR_DIGIT|CHAR_UPPER|CHAR_LOWER)) != 0; +} + +/// Return true if this character is an ASCII hex digit: [0-9a-fA-F] +LLVM_READONLY static inline bool isHexDigit(unsigned char c) { + using namespace charinfo; + return (InfoTable[c] & (CHAR_DIGIT|CHAR_XLETTER)) != 0; +} + +/// Return true if this character is an ASCII punctuation character. +/// +/// Note that '_' is both a punctuation character and an identifier character! +LLVM_READONLY static inline bool isPunctuation(unsigned char c) { + using namespace charinfo; + return (InfoTable[c] & (CHAR_UNDER|CHAR_PERIOD|CHAR_RAWDEL|CHAR_PUNCT)) != 0; +} + +/// Return true if this character is an ASCII printable character; that is, a +/// character that should take exactly one column to print in a fixed-width +/// terminal. +LLVM_READONLY static inline bool isPrintable(unsigned char c) { + using namespace charinfo; + return (InfoTable[c] & (CHAR_UPPER|CHAR_LOWER|CHAR_PERIOD|CHAR_PUNCT| + CHAR_DIGIT|CHAR_UNDER|CHAR_RAWDEL|CHAR_SPACE)) != 0; +} + +/// Return true if this is the body character of a C preprocessing number, +/// which is [a-zA-Z0-9_.]. +LLVM_READONLY static inline bool isPreprocessingNumberBody(unsigned char c) { + using namespace charinfo; + return (InfoTable[c] & + (CHAR_UPPER|CHAR_LOWER|CHAR_DIGIT|CHAR_UNDER|CHAR_PERIOD)) != 0; +} + +/// Return true if this is the body character of a C++ raw string delimiter. +LLVM_READONLY static inline bool isRawStringDelimBody(unsigned char c) { + using namespace charinfo; + return (InfoTable[c] & (CHAR_UPPER|CHAR_LOWER|CHAR_PERIOD| + CHAR_DIGIT|CHAR_UNDER|CHAR_RAWDEL)) != 0; +} + + +/// Converts the given ASCII character to its lowercase equivalent. +/// +/// If the character is not an uppercase character, it is returned as is. +LLVM_READONLY static inline char toLowercase(char c) { + if (isUppercase(c)) + return c + 'a' - 'A'; + return c; +} + +/// Converts the given ASCII character to its uppercase equivalent. +/// +/// If the character is not a lowercase character, it is returned as is. +LLVM_READONLY static inline char toUppercase(char c) { + if (isLowercase(c)) + return c + 'A' - 'a'; + return c; +} + + +/// Return true if this is a valid ASCII identifier. +/// +/// Note that this is a very simple check; it does not accept '$' or UCNs as +/// valid identifier characters. +LLVM_READONLY static inline bool isValidIdentifier(StringRef S) { + if (S.empty() || !isIdentifierHead(S[0])) + return false; + + for (StringRef::iterator I = S.begin(), E = S.end(); I != E; ++I) + if (!isIdentifierBody(*I)) + return false; + + return true; +} + +} // end namespace clang + +#endif |
