1 //===--- clang/Basic/CharInfo.h - Classifying ASCII Characters ------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef CLANG_BASIC_CHARINFO_H 11 #define CLANG_BASIC_CHARINFO_H 12 13 #include "clang/Basic/LLVM.h" 14 #include "llvm/ADT/StringRef.h" 15 #include "llvm/Support/Compiler.h" 16 #include "llvm/Support/DataTypes.h" 17 18 namespace clang { 19 namespace charinfo { 20 extern const uint16_t InfoTable[256]; 21 22 enum { 23 CHAR_HORZ_WS = 0x0001, // '\t', '\f', '\v'. Note, no '\0' 24 CHAR_VERT_WS = 0x0002, // '\r', '\n' 25 CHAR_SPACE = 0x0004, // ' ' 26 CHAR_DIGIT = 0x0008, // 0-9 27 CHAR_XLETTER = 0x0010, // a-f,A-F 28 CHAR_UPPER = 0x0020, // A-Z 29 CHAR_LOWER = 0x0040, // a-z 30 CHAR_UNDER = 0x0080, // _ 31 CHAR_PERIOD = 0x0100, // . 32 CHAR_RAWDEL = 0x0200, // {}[]#<>%:;?*+-/^&|~!=,"' 33 CHAR_PUNCT = 0x0400 // `$@() 34 }; 35 36 enum { 37 CHAR_XUPPER = CHAR_XLETTER | CHAR_UPPER, 38 CHAR_XLOWER = CHAR_XLETTER | CHAR_LOWER 39 }; 40 } // end namespace charinfo 41 42 /// Returns true if this is an ASCII character. 43 LLVM_READNONE static inline bool isASCII(char c) { 44 return static_cast<unsigned char>(c) <= 127; 45 } 46 47 /// Returns true if this is a valid first character of a C identifier, 48 /// which is [a-zA-Z_]. 49 LLVM_READONLY static inline bool isIdentifierHead(unsigned char c, 50 bool AllowDollar = false) { 51 using namespace charinfo; 52 if (InfoTable[c] & (CHAR_UPPER|CHAR_LOWER|CHAR_UNDER)) 53 return true; 54 return AllowDollar && c == '$'; 55 } 56 57 /// Returns true if this is a body character of a C identifier, 58 /// which is [a-zA-Z0-9_]. 59 LLVM_READONLY static inline bool isIdentifierBody(unsigned char c, 60 bool AllowDollar = false) { 61 using namespace charinfo; 62 if (InfoTable[c] & (CHAR_UPPER|CHAR_LOWER|CHAR_DIGIT|CHAR_UNDER)) 63 return true; 64 return AllowDollar && c == '$'; 65 } 66 67 /// Returns true if this character is horizontal ASCII whitespace: 68 /// ' ', '\\t', '\\f', '\\v'. 69 /// 70 /// Note that this returns false for '\\0'. 71 LLVM_READONLY static inline bool isHorizontalWhitespace(unsigned char c) { 72 using namespace charinfo; 73 return (InfoTable[c] & (CHAR_HORZ_WS|CHAR_SPACE)) != 0; 74 } 75 76 /// Returns true if this character is vertical ASCII whitespace: '\\n', '\\r'. 77 /// 78 /// Note that this returns false for '\\0'. 79 LLVM_READONLY static inline bool isVerticalWhitespace(unsigned char c) { 80 using namespace charinfo; 81 return (InfoTable[c] & CHAR_VERT_WS) != 0; 82 } 83 84 /// Return true if this character is horizontal or vertical ASCII whitespace: 85 /// ' ', '\\t', '\\f', '\\v', '\\n', '\\r'. 86 /// 87 /// Note that this returns false for '\\0'. 88 LLVM_READONLY static inline bool isWhitespace(unsigned char c) { 89 using namespace charinfo; 90 return (InfoTable[c] & (CHAR_HORZ_WS|CHAR_VERT_WS|CHAR_SPACE)) != 0; 91 } 92 93 /// Return true if this character is an ASCII digit: [0-9] 94 LLVM_READONLY static inline bool isDigit(unsigned char c) { 95 using namespace charinfo; 96 return (InfoTable[c] & CHAR_DIGIT) != 0; 97 } 98 99 /// Return true if this character is a lowercase ASCII letter: [a-z] 100 LLVM_READONLY static inline bool isLowercase(unsigned char c) { 101 using namespace charinfo; 102 return (InfoTable[c] & CHAR_LOWER) != 0; 103 } 104 105 /// Return true if this character is an uppercase ASCII letter: [A-Z] 106 LLVM_READONLY static inline bool isUppercase(unsigned char c) { 107 using namespace charinfo; 108 return (InfoTable[c] & CHAR_UPPER) != 0; 109 } 110 111 /// Return true if this character is an ASCII letter: [a-zA-Z] 112 LLVM_READONLY static inline bool isLetter(unsigned char c) { 113 using namespace charinfo; 114 return (InfoTable[c] & (CHAR_UPPER|CHAR_LOWER)) != 0; 115 } 116 117 /// Return true if this character is an ASCII letter or digit: [a-zA-Z0-9] 118 LLVM_READONLY static inline bool isAlphanumeric(unsigned char c) { 119 using namespace charinfo; 120 return (InfoTable[c] & (CHAR_DIGIT|CHAR_UPPER|CHAR_LOWER)) != 0; 121 } 122 123 /// Return true if this character is an ASCII hex digit: [0-9a-fA-F] 124 LLVM_READONLY static inline bool isHexDigit(unsigned char c) { 125 using namespace charinfo; 126 return (InfoTable[c] & (CHAR_DIGIT|CHAR_XLETTER)) != 0; 127 } 128 129 /// Return true if this character is an ASCII punctuation character. 130 /// 131 /// Note that '_' is both a punctuation character and an identifier character! 132 LLVM_READONLY static inline bool isPunctuation(unsigned char c) { 133 using namespace charinfo; 134 return (InfoTable[c] & (CHAR_UNDER|CHAR_PERIOD|CHAR_RAWDEL|CHAR_PUNCT)) != 0; 135 } 136 137 /// Return true if this character is an ASCII printable character; that is, a 138 /// character that should take exactly one column to print in a fixed-width 139 /// terminal. 140 LLVM_READONLY static inline bool isPrintable(unsigned char c) { 141 using namespace charinfo; 142 return (InfoTable[c] & (CHAR_UPPER|CHAR_LOWER|CHAR_PERIOD|CHAR_PUNCT| 143 CHAR_DIGIT|CHAR_UNDER|CHAR_RAWDEL|CHAR_SPACE)) != 0; 144 } 145 146 /// Return true if this is the body character of a C preprocessing number, 147 /// which is [a-zA-Z0-9_.]. 148 LLVM_READONLY static inline bool isPreprocessingNumberBody(unsigned char c) { 149 using namespace charinfo; 150 return (InfoTable[c] & 151 (CHAR_UPPER|CHAR_LOWER|CHAR_DIGIT|CHAR_UNDER|CHAR_PERIOD)) != 0; 152 } 153 154 /// Return true if this is the body character of a C++ raw string delimiter. 155 LLVM_READONLY static inline bool isRawStringDelimBody(unsigned char c) { 156 using namespace charinfo; 157 return (InfoTable[c] & (CHAR_UPPER|CHAR_LOWER|CHAR_PERIOD| 158 CHAR_DIGIT|CHAR_UNDER|CHAR_RAWDEL)) != 0; 159 } 160 161 162 /// Converts the given ASCII character to its lowercase equivalent. 163 /// 164 /// If the character is not an uppercase character, it is returned as is. 165 LLVM_READONLY static inline char toLowercase(char c) { 166 if (isUppercase(c)) 167 return c + 'a' - 'A'; 168 return c; 169 } 170 171 /// Converts the given ASCII character to its uppercase equivalent. 172 /// 173 /// If the character is not a lowercase character, it is returned as is. 174 LLVM_READONLY static inline char toUppercase(char c) { 175 if (isLowercase(c)) 176 return c + 'A' - 'a'; 177 return c; 178 } 179 180 181 /// Return true if this is a valid ASCII identifier. 182 /// 183 /// Note that this is a very simple check; it does not accept '$' or UCNs as 184 /// valid identifier characters. 185 LLVM_READONLY static inline bool isValidIdentifier(StringRef S) { 186 if (S.empty() || !isIdentifierHead(S[0])) 187 return false; 188 189 for (StringRef::iterator I = S.begin(), E = S.end(); I != E; ++I) 190 if (!isIdentifierBody(*I)) 191 return false; 192 193 return true; 194 } 195 196 } // end namespace clang 197 198 #endif 199
