StringExtras.h revision d5b58c239e44fe4fa2322900b26c691f5a44bd87 
1//===-- llvm/ADT/StringExtras.h - Useful string functions -------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
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.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file contains some functions that are useful when dealing with strings.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_ADT_STRINGEXTRAS_H
15#define LLVM_ADT_STRINGEXTRAS_H
16
17#include "llvm/Support/DataTypes.h"
18#include <cctype>
19#include <cstdio>
20#include <string>
21#include <vector>
22
23namespace llvm {
24
25static inline std::string utohexstr(uint64_t X) {
26  char Buffer[40];
27  char *BufPtr = Buffer+39;
28
29  *BufPtr = 0;                  // Null terminate buffer...
30  if (X == 0) *--BufPtr = '0';  // Handle special case...
31
32  while (X) {
33    unsigned char Mod = static_cast<unsigned char>(X) & 15;
34    if (Mod < 10)
35      *--BufPtr = '0' + Mod;
36    else
37      *--BufPtr = 'A' + Mod-10;
38    X >>= 4;
39  }
40  return std::string(BufPtr);
41}
42
43static inline std::string utostr_32(uint32_t X, bool isNeg = false) {
44  char Buffer[20];
45  char *BufPtr = Buffer+19;
46
47  *BufPtr = 0;                  // Null terminate buffer...
48  if (X == 0) *--BufPtr = '0';  // Handle special case...
49
50  while (X) {
51    *--BufPtr = '0' + char(X % 10);
52    X /= 10;
53  }
54
55  if (isNeg) *--BufPtr = '-';   // Add negative sign...
56
57  return std::string(BufPtr);
58}
59
60static inline std::string utostr(uint64_t X, bool isNeg = false) {
61  if (X == uint32_t(X))
62    return utostr_32(uint32_t(X), isNeg);
63
64  char Buffer[40];
65  char *BufPtr = Buffer+39;
66
67  *BufPtr = 0;                  // Null terminate buffer...
68  if (X == 0) *--BufPtr = '0';  // Handle special case...
69
70  while (X) {
71    *--BufPtr = '0' + char(X % 10);
72    X /= 10;
73  }
74
75  if (isNeg) *--BufPtr = '-';   // Add negative sign...
76  return std::string(BufPtr);
77}
78
79
80static inline std::string itostr(int64_t X) {
81  if (X < 0)
82    return utostr(static_cast<uint64_t>(-X), true);
83  else
84    return utostr(static_cast<uint64_t>(X));
85}
86
87static inline std::string ftostr(double V) {
88  char Buffer[200];
89  sprintf(Buffer, "%20.6e", V);
90  char *B = Buffer;
91  while (*B == ' ') ++B;
92  return B;
93}
94
95static 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]));
100  return result;
101}
102
103/// StringsEqualNoCase - Return true if the two strings are equal, ignoring
104/// case.
105static 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;
110  return true;
111}
112
113/// StringsEqualNoCase - Return true if the two strings are equal, ignoring
114/// case.
115static inline bool StringsEqualNoCase(const std::string &LHS,
116                                      const char *RHS) {
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;
120  }
121  return RHS[LHS.size()] == 0;  // Not too long?
122}
123
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.
130std::string getToken(std::string &Source,
131                     const char *Delimiters = " \t\n\v\f\r");
132
133/// SplitString - Split up the specified string according to the specified
134/// delimiters, appending the result fragments to the output list.
135void SplitString(const std::string &Source,
136                 std::vector<std::string> &OutFragments,
137                 const char *Delimiters = " \t\n\v\f\r");
138
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).
142void UnescapeString(std::string &Str);
143
144/// EscapeString - Modify the argument string, turning '\\' and anything that
145/// doesn't satisfy std::isprint into an escape sequence.
146void EscapeString(std::string &Str);
147
148} // End llvm namespace
149
150#endif
151