X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FADT%2FStringExtras.h;h=9503e0f805a76d5195e9fffcc63fa3943bc2807e;hb=b09c146b116359616f6cbd4c8b3328607e00ff42;hp=fcfa65f232f48dfaa9d5775212b3e1981ae35d42;hpb=8831db745bb0c3ed7939df475f924f53f43254a2;p=oota-llvm.git diff --git a/include/llvm/ADT/StringExtras.h b/include/llvm/ADT/StringExtras.h index fcfa65f232f..9503e0f805a 100644 --- a/include/llvm/ADT/StringExtras.h +++ b/include/llvm/ADT/StringExtras.h @@ -1,49 +1,66 @@ -//===-- Support/StringExtras.h - Useful string functions --------*- C++ -*-===// -// +//===-- llvm/ADT/StringExtras.h - Useful string functions -------*- C++ -*-===// +// // The LLVM Compiler Infrastructure // -// This file was developed by the LLVM research group and is distributed under -// the University of Illinois Open Source License. See LICENSE.TXT for details. -// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// //===----------------------------------------------------------------------===// // // This file contains some functions that are useful when dealing with strings. // //===----------------------------------------------------------------------===// -#ifndef SUPPORT_STRINGEXTRAS_H -#define SUPPORT_STRINGEXTRAS_H +#ifndef LLVM_ADT_STRINGEXTRAS_H +#define LLVM_ADT_STRINGEXTRAS_H -#include "Support/DataTypes.h" -#include -#include -#include +#include "llvm/ADT/StringRef.h" +#include "llvm/Support/DataTypes.h" namespace llvm { +template class SmallVectorImpl; -static inline std::string utohexstr(uint64_t X) { - char Buffer[40]; - char *BufPtr = Buffer+39; +/// hexdigit - Return the hexadecimal character for the +/// given number \p X (which should be less than 16). +static inline char hexdigit(unsigned X, bool LowerCase = false) { + const char HexChar = LowerCase ? 'a' : 'A'; + return X < 10 ? '0' + X : HexChar + X - 10; +} - *BufPtr = 0; // Null terminate buffer... - if (X == 0) *--BufPtr = '0'; // Handle special case... +/// utohex_buffer - Emit the specified number into the buffer specified by +/// BufferEnd, returning a pointer to the start of the string. This can be used +/// like this: (note that the buffer must be large enough to handle any number): +/// char Buffer[40]; +/// printf("0x%s", utohex_buffer(X, Buffer+40)); +/// +/// This should only be used with unsigned types. +/// +template +static inline char *utohex_buffer(IntTy X, char *BufferEnd) { + char *BufPtr = BufferEnd; + *--BufPtr = 0; // Null terminate buffer. + if (X == 0) { + *--BufPtr = '0'; // Handle special case. + return BufPtr; + } while (X) { - unsigned char Mod = (unsigned char)X & 15; - if (Mod < 10) - *--BufPtr = '0' + Mod; - else - *--BufPtr = 'A' + Mod-10; + unsigned char Mod = static_cast(X) & 15; + *--BufPtr = hexdigit(Mod); X >>= 4; } - return std::string(BufPtr); + return BufPtr; +} + +static inline std::string utohexstr(uint64_t X) { + char Buffer[17]; + return utohex_buffer(X, Buffer+17); } -static inline std::string utostr(unsigned long long X, bool isNeg = false) { - char Buffer[40]; - char *BufPtr = Buffer+39; +static inline std::string utostr_32(uint32_t X, bool isNeg = false) { + char Buffer[11]; + char *BufPtr = Buffer+11; - *BufPtr = 0; // Null terminate buffer... if (X == 0) *--BufPtr = '0'; // Handle special case... while (X) { @@ -52,18 +69,14 @@ static inline std::string utostr(unsigned long long X, bool isNeg = false) { } if (isNeg) *--BufPtr = '-'; // Add negative sign... - return std::string(BufPtr); -} -static inline std::string utostr(unsigned long X, bool isNeg = false) { - return utostr(static_cast(X), isNeg); + return std::string(BufPtr, Buffer+11); } -static inline std::string utostr(unsigned X, bool isNeg = false) { - char Buffer[20]; - char *BufPtr = Buffer+19; +static inline std::string utostr(uint64_t X, bool isNeg = false) { + char Buffer[21]; + char *BufPtr = Buffer+21; - *BufPtr = 0; // Null terminate buffer... if (X == 0) *--BufPtr = '0'; // Handle special case... while (X) { @@ -72,53 +85,68 @@ static inline std::string utostr(unsigned X, bool isNeg = false) { } if (isNeg) *--BufPtr = '-'; // Add negative sign... - - return std::string(BufPtr); + return std::string(BufPtr, Buffer+21); } -static inline std::string itostr(long long X) { - if (X < 0) - return utostr(static_cast(-X), true); - else - return utostr(static_cast(X)); -} - -static inline std::string itostr(long X) { - if (X < 0) + +static inline std::string itostr(int64_t X) { + if (X < 0) return utostr(static_cast(-X), true); else return utostr(static_cast(X)); } -static inline std::string itostr(int X) { - if (X < 0) - return utostr(static_cast(-X), true); - else - return utostr(static_cast(X)); -} - -static inline std::string ftostr(double V) { - char Buffer[200]; - sprintf(Buffer, "%20.6e", V); - return Buffer; -} - -static inline std::string LowercaseString(const std::string &S) { - std::string result(S); - for (unsigned i = 0; i < S.length(); ++i) - if (isupper(result[i])) - result[i] = (char)tolower(result[i]); - return result; -} +/// StrInStrNoCase - Portable version of strcasestr. Locates the first +/// occurrence of string 's1' in string 's2', ignoring case. Returns +/// the offset of s2 in s1 or npos if s2 cannot be found. +StringRef::size_type StrInStrNoCase(StringRef s1, StringRef s2); /// getToken - This function extracts one token from source, ignoring any /// leading characters that appear in the Delimiters string, and ending the /// token at any of the characters that appear in the Delimiters string. If /// there are no tokens in the source string, an empty string is returned. -/// The Source source string is updated in place to remove the returned string -/// and any delimiter prefix from it. -std::string getToken(std::string &Source, - const char *Delimiters = " \t\n\v\f\r"); +/// The function returns a pair containing the extracted token and the +/// remaining tail string. +std::pair getToken(StringRef Source, + StringRef Delimiters = " \t\n\v\f\r"); + +/// SplitString - Split up the specified string according to the specified +/// delimiters, appending the result fragments to the output list. +void SplitString(StringRef Source, + SmallVectorImpl &OutFragments, + StringRef Delimiters = " \t\n\v\f\r"); + +/// HashString - Hash function for strings. +/// +/// This is the Bernstein hash function. +// +// FIXME: Investigate whether a modified bernstein hash function performs +// better: http://eternallyconfuzzled.com/tuts/algorithms/jsw_tut_hashing.aspx +// X*33+c -> X*33^c +static inline unsigned HashString(StringRef Str, unsigned Result = 0) { + for (unsigned i = 0, e = Str.size(); i != e; ++i) + Result = Result * 33 + (unsigned char)Str[i]; + return Result; +} + +/// Returns the English suffix for an ordinal integer (-st, -nd, -rd, -th). +static inline StringRef getOrdinalSuffix(unsigned Val) { + // It is critically important that we do this perfectly for + // user-written sequences with over 100 elements. + switch (Val % 100) { + case 11: + case 12: + case 13: + return "th"; + default: + switch (Val % 10) { + case 1: return "st"; + case 2: return "nd"; + case 3: return "rd"; + default: return "th"; + } + } +} } // End llvm namespace