1 //===-- llvm/ADT/StringExtras.h - Useful string functions -------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains some functions that are useful when dealing with strings.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_ADT_STRINGEXTRAS_H
15 #define LLVM_ADT_STRINGEXTRAS_H
17 #include "llvm/Support/DataTypes.h"
25 static inline std::string utohexstr(uint64_t X) {
27 char *BufPtr = Buffer+39;
29 *BufPtr = 0; // Null terminate buffer...
30 if (X == 0) *--BufPtr = '0'; // Handle special case...
33 unsigned char Mod = static_cast<unsigned char>(X) & 15;
35 *--BufPtr = '0' + Mod;
37 *--BufPtr = 'A' + Mod-10;
40 return std::string(BufPtr);
43 static inline std::string utostr_32(uint32_t X, bool isNeg = false) {
45 char *BufPtr = Buffer+19;
47 *BufPtr = 0; // Null terminate buffer...
48 if (X == 0) *--BufPtr = '0'; // Handle special case...
51 *--BufPtr = '0' + char(X % 10);
55 if (isNeg) *--BufPtr = '-'; // Add negative sign...
57 return std::string(BufPtr);
60 static inline std::string utostr(uint64_t X, bool isNeg = false) {
62 return utostr_32(uint32_t(X), isNeg);
65 char *BufPtr = Buffer+39;
67 *BufPtr = 0; // Null terminate buffer...
68 if (X == 0) *--BufPtr = '0'; // Handle special case...
71 *--BufPtr = '0' + char(X % 10);
75 if (isNeg) *--BufPtr = '-'; // Add negative sign...
76 return std::string(BufPtr);
80 static inline std::string itostr(int64_t X) {
82 return utostr(static_cast<uint64_t>(-X), true);
84 return utostr(static_cast<uint64_t>(X));
87 static inline std::string ftostr(double V) {
89 sprintf(Buffer, "%20.6e", V);
91 while (*B == ' ') ++B;
95 static inline std::string LowercaseString(const std::string &S) {
96 std::string result(S);
97 for (unsigned i = 0; i < S.length(); ++i)
98 if (isupper(result[i]))
99 result[i] = char(tolower(result[i]));
103 /// StringsEqualNoCase - Return true if the two strings are equal, ignoring
105 static inline bool StringsEqualNoCase(const std::string &LHS,
106 const std::string &RHS) {
107 if (LHS.size() != RHS.size()) return false;
108 for (unsigned i = 0, e = LHS.size(); i != e; ++i)
109 if (tolower(LHS[i]) != tolower(RHS[i])) return false;
113 /// StringsEqualNoCase - Return true if the two strings are equal, ignoring
115 static inline bool StringsEqualNoCase(const std::string &LHS,
117 for (unsigned i = 0, e = LHS.size(); i != e; ++i) {
118 if (RHS[i] == 0) return false; // RHS too short.
119 if (tolower(LHS[i]) != tolower(RHS[i])) return false;
121 return RHS[LHS.size()] == 0; // Not too long?
124 /// getToken - This function extracts one token from source, ignoring any
125 /// leading characters that appear in the Delimiters string, and ending the
126 /// token at any of the characters that appear in the Delimiters string. If
127 /// there are no tokens in the source string, an empty string is returned.
128 /// The Source source string is updated in place to remove the returned string
129 /// and any delimiter prefix from it.
130 std::string getToken(std::string &Source,
131 const char *Delimiters = " \t\n\v\f\r");
133 /// SplitString - Split up the specified string according to the specified
134 /// delimiters, appending the result fragments to the output list.
135 void SplitString(const std::string &Source,
136 std::vector<std::string> &OutFragments,
137 const char *Delimiters = " \t\n\v\f\r");
139 /// UnescapeString - Modify the argument string, turning two character sequences
140 /// like '\\' 'n' into '\n'. This handles: \e \a \b \f \n \r \t \v \' \\ and
141 /// \num (where num is a 1-3 byte octal value).
142 void UnescapeString(std::string &Str);
144 /// EscapeString - Modify the argument string, turning '\\' and anything that
145 /// doesn't satisfy std::isprint into an escape sequence.
146 void EscapeString(std::string &Str);
148 } // End llvm namespace