StringExtras.h revision 1fd2e6d84e271c17d7ae8778058c13de517dbc17 
1//===-- llvm/ADT/StringExtras.h - Useful string functions -------*- C++ -*-===//
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// 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 "llvm/ADT/APFloat.h"
19#include <cctype>
20#include <cstdio>
21#include <string>
22#include <vector>
23
24namespace llvm {
25
26static inline std::string utohexstr(uint64_t X) {
27  char Buffer[40];
28  char *BufPtr = Buffer+39;
29
30  *BufPtr = 0;                  // Null terminate buffer...
31  if (X == 0) *--BufPtr = '0';  // Handle special case...
32
33  while (X) {
34    unsigned char Mod = static_cast<unsigned char>(X) & 15;
35    if (Mod < 10)
36      *--BufPtr = '0' + Mod;
37    else
38      *--BufPtr = 'A' + Mod-10;
39    X >>= 4;
40  }
41  return std::string(BufPtr);
42}
43
44static inline std::string utostr_32(uint32_t X, bool isNeg = false) {
45  char Buffer[20];
46  char *BufPtr = Buffer+19;
47
48  *BufPtr = 0;                  // Null terminate buffer...
49  if (X == 0) *--BufPtr = '0';  // Handle special case...
50
51  while (X) {
52    *--BufPtr = '0' + char(X % 10);
53    X /= 10;
54  }
55
56  if (isNeg) *--BufPtr = '-';   // Add negative sign...
57
58  return std::string(BufPtr);
59}
60
61static inline std::string utostr(uint64_t X, bool isNeg = false) {
62  if (X == uint32_t(X))
63    return utostr_32(uint32_t(X), isNeg);
64
65  char Buffer[40];
66  char *BufPtr = Buffer+39;
67
68  *BufPtr = 0;                  // Null terminate buffer...
69  if (X == 0) *--BufPtr = '0';  // Handle special case...
70
71  while (X) {
72    *--BufPtr = '0' + char(X % 10);
73    X /= 10;
74  }
75
76  if (isNeg) *--BufPtr = '-';   // Add negative sign...
77  return std::string(BufPtr);
78}
79
80
81static inline std::string itostr(int64_t X) {
82  if (X < 0)
83    return utostr(static_cast<uint64_t>(-X), true);
84  else
85    return utostr(static_cast<uint64_t>(X));
86}
87
88static inline std::string itohexstr(int64_t X) {
89  return utohexstr(static_cast<uint64_t>(X));
90}
91
92static inline std::string ftostr(double V) {
93  char Buffer[200];
94  sprintf(Buffer, "%20.6e", V);
95  char *B = Buffer;
96  while (*B == ' ') ++B;
97  return B;
98}
99
100static inline std::string ftostr(const APFloat& V) {
101  if (&V.getSemantics() == &APFloat::IEEEdouble)
102    return ftostr(V.convertToDouble());
103  else if (&V.getSemantics() == &APFloat::IEEEsingle)
104    return ftostr((double)V.convertToFloat());
105  return "<unknown format in ftostr>"; // error
106}
107
108static inline std::string LowercaseString(const std::string &S) {
109  std::string result(S);
110  for (unsigned i = 0; i < S.length(); ++i)
111    if (isupper(result[i]))
112      result[i] = char(tolower(result[i]));
113  return result;
114}
115
116static inline std::string UppercaseString(const std::string &S) {
117  std::string result(S);
118  for (unsigned i = 0; i < S.length(); ++i)
119    if (islower(result[i]))
120      result[i] = char(toupper(result[i]));
121  return result;
122}
123
124/// StringsEqualNoCase - Return true if the two strings are equal, ignoring
125/// case.
126static inline bool StringsEqualNoCase(const std::string &LHS,
127                                      const std::string &RHS) {
128  if (LHS.size() != RHS.size()) return false;
129  for (unsigned i = 0, e = static_cast<unsigned>(LHS.size()); i != e; ++i)
130    if (tolower(LHS[i]) != tolower(RHS[i])) return false;
131  return true;
132}
133
134/// StringsEqualNoCase - Return true if the two strings are equal, ignoring
135/// case.
136static inline bool StringsEqualNoCase(const std::string &LHS,
137                                      const char *RHS) {
138  for (unsigned i = 0, e = static_cast<unsigned>(LHS.size()); i != e; ++i) {
139    if (RHS[i] == 0) return false;  // RHS too short.
140    if (tolower(LHS[i]) != tolower(RHS[i])) return false;
141  }
142  return RHS[LHS.size()] == 0;  // Not too long?
143}
144
145/// CStrInCStrNoCase - Portable version of strcasestr.  Locates the first
146///  occurance of c-string 's2' in string 's1', ignoring case.  Returns
147///  NULL if 's2' cannot be found.
148static inline const char* CStrInCStrNoCase(const char *s1, const char *s2) {
149
150  // Are either strings NULL or empty?
151  if (!s1 || !s2 || s1[0] == '\0' || s2[0] == '\0')
152    return 0;
153
154  if (s1 == s2)
155    return s1;
156
157  const char *I1=s1, *I2=s2;
158
159  while (*I1 != '\0' || *I2 != '\0' )
160    if (tolower(*I1) != tolower(*I2)) { // No match.  Start over.
161      ++s1; I1 = s1; I2 = s2;
162    }
163    else { // Character match.  Advance to the next character.
164      ++I1; ++I2;
165    }
166
167  // If we exhausted all of the characters in 's2', then 's2' appears in 's1'.
168  return *I2 == '\0' ? s1 : 0;
169}
170
171/// getToken - This function extracts one token from source, ignoring any
172/// leading characters that appear in the Delimiters string, and ending the
173/// token at any of the characters that appear in the Delimiters string.  If
174/// there are no tokens in the source string, an empty string is returned.
175/// The Source source string is updated in place to remove the returned string
176/// and any delimiter prefix from it.
177std::string getToken(std::string &Source,
178                     const char *Delimiters = " \t\n\v\f\r");
179
180/// SplitString - Split up the specified string according to the specified
181/// delimiters, appending the result fragments to the output list.
182void SplitString(const std::string &Source,
183                 std::vector<std::string> &OutFragments,
184                 const char *Delimiters = " \t\n\v\f\r");
185
186/// UnescapeString - Modify the argument string, turning two character sequences
187/// like '\\' 'n' into '\n'.  This handles: \e \a \b \f \n \r \t \v \' \\ and
188/// \num (where num is a 1-3 byte octal value).
189void UnescapeString(std::string &Str);
190
191/// EscapeString - Modify the argument string, turning '\\' and anything that
192/// doesn't satisfy std::isprint into an escape sequence.
193void EscapeString(std::string &Str);
194
195} // End llvm namespace
196
197#endif
198