StringExtras.h revision 551ccae044b0ff658fe629dd67edd5ffe75d10e8 
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
22namespace llvm {
23
24static inline std::string utohexstr(uint64_t X) {
25  char Buffer[40];
26  char *BufPtr = Buffer+39;
27
28  *BufPtr = 0;                  // Null terminate buffer...
29  if (X == 0) *--BufPtr = '0';  // Handle special case...
30
31  while (X) {
32    unsigned char Mod = (unsigned char)X & 15;
33    if (Mod < 10)
34      *--BufPtr = '0' + Mod;
35    else
36      *--BufPtr = 'A' + Mod-10;
37    X >>= 4;
38  }
39  return std::string(BufPtr);
40}
41
42static inline std::string utostr(unsigned long long X, bool isNeg = false) {
43  char Buffer[40];
44  char *BufPtr = Buffer+39;
45
46  *BufPtr = 0;                  // Null terminate buffer...
47  if (X == 0) *--BufPtr = '0';  // Handle special case...
48
49  while (X) {
50    *--BufPtr = '0' + char(X % 10);
51    X /= 10;
52  }
53
54  if (isNeg) *--BufPtr = '-';   // Add negative sign...
55  return std::string(BufPtr);
56}
57
58static inline std::string utostr(unsigned long X, bool isNeg = false) {
59  return utostr(static_cast<unsigned long long>(X), isNeg);
60}
61
62static inline std::string utostr(unsigned X, bool isNeg = false) {
63  char Buffer[20];
64  char *BufPtr = Buffer+19;
65
66  *BufPtr = 0;                  // Null terminate buffer...
67  if (X == 0) *--BufPtr = '0';  // Handle special case...
68
69  while (X) {
70    *--BufPtr = '0' + char(X % 10);
71    X /= 10;
72  }
73
74  if (isNeg) *--BufPtr = '-';   // Add negative sign...
75
76  return std::string(BufPtr);
77}
78
79static inline std::string itostr(long long X) {
80  if (X < 0)
81    return utostr(static_cast<uint64_t>(-X), true);
82  else
83    return utostr(static_cast<uint64_t>(X));
84}
85
86static inline std::string itostr(long X) {
87  if (X < 0)
88    return utostr(static_cast<uint64_t>(-X), true);
89  else
90    return utostr(static_cast<uint64_t>(X));
91}
92
93static inline std::string itostr(int X) {
94  if (X < 0)
95    return utostr(static_cast<unsigned>(-X), true);
96  else
97    return utostr(static_cast<unsigned>(X));
98}
99
100static inline std::string ftostr(double V) {
101  char Buffer[200];
102  sprintf(Buffer, "%20.6e", V);
103  return Buffer;
104}
105
106static inline std::string LowercaseString(const std::string &S) {
107  std::string result(S);
108  for (unsigned i = 0; i < S.length(); ++i)
109    if (isupper(result[i]))
110      result[i] = (char)tolower(result[i]);
111  return result;
112}
113
114/// getToken - This function extracts one token from source, ignoring any
115/// leading characters that appear in the Delimiters string, and ending the
116/// token at any of the characters that appear in the Delimiters string.  If
117/// there are no tokens in the source string, an empty string is returned.
118/// The Source source string is updated in place to remove the returned string
119/// and any delimiter prefix from it.
120std::string getToken(std::string &Source,
121                     const char *Delimiters = " \t\n\v\f\r");
122
123} // End llvm namespace
124
125#endif
126