StringExtras.h revision c5ccbdbe329af09fd34aeb097c62ce2c33296f36 
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 "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 ftostr(double V) {
89  char Buffer[200];
90  sprintf(Buffer, "%20.6e", V);
91  char *B = Buffer;
92  while (*B == ' ') ++B;
93  return B;
94}
95
96static inline std::string ftostr(const APFloat& V) {
97  if (&V.getSemantics() == &APFloat::IEEEdouble)
98    return ftostr(V.convertToDouble());
99  else if (&V.getSemantics() == &APFloat::IEEEsingle)
100    return ftostr((double)V.convertToFloat());
101  return 0; // error
102}
103
104static inline std::string LowercaseString(const std::string &S) {
105  std::string result(S);
106  for (unsigned i = 0; i < S.length(); ++i)
107    if (isupper(result[i]))
108      result[i] = char(tolower(result[i]));
109  return result;
110}
111
112static inline std::string UppercaseString(const std::string &S) {
113  std::string result(S);
114  for (unsigned i = 0; i < S.length(); ++i)
115    if (islower(result[i]))
116      result[i] = char(toupper(result[i]));
117  return result;
118}
119
120/// StringsEqualNoCase - Return true if the two strings are equal, ignoring
121/// case.
122static inline bool StringsEqualNoCase(const std::string &LHS,
123                                      const std::string &RHS) {
124  if (LHS.size() != RHS.size()) return false;
125  for (unsigned i = 0, e = LHS.size(); i != e; ++i)
126    if (tolower(LHS[i]) != tolower(RHS[i])) return false;
127  return true;
128}
129
130/// StringsEqualNoCase - Return true if the two strings are equal, ignoring
131/// case.
132static inline bool StringsEqualNoCase(const std::string &LHS,
133                                      const char *RHS) {
134  for (unsigned i = 0, e = LHS.size(); i != e; ++i) {
135    if (RHS[i] == 0) return false;  // RHS too short.
136    if (tolower(LHS[i]) != tolower(RHS[i])) return false;
137  }
138  return RHS[LHS.size()] == 0;  // Not too long?
139}
140
141/// getToken - This function extracts one token from source, ignoring any
142/// leading characters that appear in the Delimiters string, and ending the
143/// token at any of the characters that appear in the Delimiters string.  If
144/// there are no tokens in the source string, an empty string is returned.
145/// The Source source string is updated in place to remove the returned string
146/// and any delimiter prefix from it.
147std::string getToken(std::string &Source,
148                     const char *Delimiters = " \t\n\v\f\r");
149
150/// SplitString - Split up the specified string according to the specified
151/// delimiters, appending the result fragments to the output list.
152void SplitString(const std::string &Source,
153                 std::vector<std::string> &OutFragments,
154                 const char *Delimiters = " \t\n\v\f\r");
155
156/// UnescapeString - Modify the argument string, turning two character sequences
157/// like '\\' 'n' into '\n'.  This handles: \e \a \b \f \n \r \t \v \' \\ and
158/// \num (where num is a 1-3 byte octal value).
159void UnescapeString(std::string &Str);
160
161/// EscapeString - Modify the argument string, turning '\\' and anything that
162/// doesn't satisfy std::isprint into an escape sequence.
163void EscapeString(std::string &Str);
164
165} // End llvm namespace
166
167#endif
168