| //===-- llvm/ADT/StringExtras.h - Useful string functions -------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // 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 LLVM_ADT_STRINGEXTRAS_H |
| #define LLVM_ADT_STRINGEXTRAS_H |
| |
| #include "llvm/Support/DataTypes.h" |
| #include "llvm/ADT/APFloat.h" |
| #include <cctype> |
| #include <cstdio> |
| #include <string> |
| #include <vector> |
| |
| namespace llvm { |
| |
| /// hexdigit - Return the (uppercase) hexadecimal character for the |
| /// given number \arg X (which should be less than 16). |
| static inline char hexdigit(unsigned X) { |
| return X < 10 ? '0' + X : 'A' + X - 10; |
| } |
| |
| /// 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<typename IntTy> |
| 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 = static_cast<unsigned char>(X) & 15; |
| *--BufPtr = hexdigit(Mod); |
| X >>= 4; |
| } |
| return BufPtr; |
| } |
| |
| static inline std::string utohexstr(uint64_t X) { |
| char Buffer[40]; |
| return utohex_buffer(X, Buffer+40); |
| } |
| |
| static inline std::string utostr_32(uint32_t X, bool isNeg = false) { |
| char Buffer[20]; |
| char *BufPtr = Buffer+19; |
| |
| *BufPtr = 0; // Null terminate buffer... |
| if (X == 0) *--BufPtr = '0'; // Handle special case... |
| |
| while (X) { |
| *--BufPtr = '0' + char(X % 10); |
| X /= 10; |
| } |
| |
| if (isNeg) *--BufPtr = '-'; // Add negative sign... |
| |
| return std::string(BufPtr); |
| } |
| |
| static inline std::string utostr(uint64_t X, bool isNeg = false) { |
| if (X == uint32_t(X)) |
| return utostr_32(uint32_t(X), isNeg); |
| |
| char Buffer[40]; |
| char *BufPtr = Buffer+39; |
| |
| *BufPtr = 0; // Null terminate buffer... |
| if (X == 0) *--BufPtr = '0'; // Handle special case... |
| |
| while (X) { |
| *--BufPtr = '0' + char(X % 10); |
| X /= 10; |
| } |
| |
| if (isNeg) *--BufPtr = '-'; // Add negative sign... |
| return std::string(BufPtr); |
| } |
| |
| |
| static inline std::string itostr(int64_t X) { |
| if (X < 0) |
| return utostr(static_cast<uint64_t>(-X), true); |
| else |
| return utostr(static_cast<uint64_t>(X)); |
| } |
| |
| static inline std::string itohexstr(int64_t X) { |
| return utohexstr(static_cast<uint64_t>(X)); |
| } |
| |
| static inline std::string ftostr(double V) { |
| char Buffer[200]; |
| sprintf(Buffer, "%20.6e", V); |
| char *B = Buffer; |
| while (*B == ' ') ++B; |
| return B; |
| } |
| |
| static inline std::string ftostr(const APFloat& V) { |
| if (&V.getSemantics() == &APFloat::IEEEdouble) |
| return ftostr(V.convertToDouble()); |
| else if (&V.getSemantics() == &APFloat::IEEEsingle) |
| return ftostr((double)V.convertToFloat()); |
| return "<unknown format in ftostr>"; // error |
| } |
| |
| 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; |
| } |
| |
| static inline std::string UppercaseString(const std::string &S) { |
| std::string result(S); |
| for (unsigned i = 0; i < S.length(); ++i) |
| if (islower(result[i])) |
| result[i] = char(toupper(result[i])); |
| return result; |
| } |
| |
| /// StringsEqualNoCase - Return true if the two strings are equal, ignoring |
| /// case. |
| static inline bool StringsEqualNoCase(const std::string &LHS, |
| const std::string &RHS) { |
| if (LHS.size() != RHS.size()) return false; |
| for (unsigned i = 0, e = static_cast<unsigned>(LHS.size()); i != e; ++i) |
| if (tolower(LHS[i]) != tolower(RHS[i])) return false; |
| return true; |
| } |
| |
| /// StringsEqualNoCase - Return true if the two strings are equal, ignoring |
| /// case. |
| static inline bool StringsEqualNoCase(const std::string &LHS, |
| const char *RHS) { |
| for (unsigned i = 0, e = static_cast<unsigned>(LHS.size()); i != e; ++i) { |
| if (RHS[i] == 0) return false; // RHS too short. |
| if (tolower(LHS[i]) != tolower(RHS[i])) return false; |
| } |
| return RHS[LHS.size()] == 0; // Not too long? |
| } |
| |
| /// CStrInCStrNoCase - Portable version of strcasestr. Locates the first |
| /// occurance of c-string 's2' in string 's1', ignoring case. Returns |
| /// NULL if 's2' cannot be found. |
| static inline const char* CStrInCStrNoCase(const char *s1, const char *s2) { |
| |
| // Are either strings NULL or empty? |
| if (!s1 || !s2 || s1[0] == '\0' || s2[0] == '\0') |
| return 0; |
| |
| if (s1 == s2) |
| return s1; |
| |
| const char *I1=s1, *I2=s2; |
| |
| while (*I1 != '\0' && *I2 != '\0' ) |
| if (tolower(*I1) != tolower(*I2)) { // No match. Start over. |
| ++s1; I1 = s1; I2 = s2; |
| } |
| else { // Character match. Advance to the next character. |
| ++I1; ++I2; |
| } |
| |
| // If we exhausted all of the characters in 's2', then 's2' appears in 's1'. |
| return *I2 == '\0' ? s1 : 0; |
| } |
| |
| /// 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"); |
| |
| /// SplitString - Split up the specified string according to the specified |
| /// delimiters, appending the result fragments to the output list. |
| void SplitString(const std::string &Source, |
| std::vector<std::string> &OutFragments, |
| const char *Delimiters = " \t\n\v\f\r"); |
| |
| /// UnescapeString - Modify the argument string, turning two character sequences |
| /// like '\\' 'n' into '\n'. This handles: \e \a \b \f \n \r \t \v \' \\ and |
| /// \num (where num is a 1-3 byte octal value). |
| void UnescapeString(std::string &Str); |
| |
| /// EscapeString - Modify the argument string, turning '\\' and anything that |
| /// doesn't satisfy std::isprint into an escape sequence. |
| void EscapeString(std::string &Str); |
| |
| } // End llvm namespace |
| |
| #endif |