str.hh revision 2632:1bb2f91485ea 
1/*
2 * Copyright (c) 2001-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef __STR_HH__
30#define __STR_HH__
31
32#include <sstream>
33#include <string>
34#include <vector>
35
36#include <ctype.h>
37
38template<class> class Hash;
39template<>
40class Hash<std::string> {
41public:
42  unsigned operator()(const std::string &s) {
43      std::string::const_iterator i = s.begin();
44      std::string::const_iterator end = s.end();
45      unsigned hash = 5381;
46
47      while (i < end)
48          hash = ((hash << 5) + hash) + *i++;
49
50      return hash;
51  }
52};
53
54inline void
55eat_lead_white(std::string &s)
56{
57    std::string::size_type off = s.find_first_not_of(' ');
58    if (off != std::string::npos) {
59        std::string::iterator begin = s.begin();
60        s.erase(begin, begin + off);
61    }
62}
63
64inline void
65eat_end_white(std::string &s)
66{
67    std::string::size_type off = s.find_last_not_of(' ');
68    if (off != std::string::npos)
69        s.erase(s.begin() + off + 1, s.end());
70}
71
72inline void
73eat_white(std::string &s)
74{
75    eat_lead_white(s);
76    eat_end_white(s);
77}
78
79inline std::string
80to_lower(const std::string &s)
81{
82    std::string lower;
83    int len = s.size();
84
85    lower.reserve(len);
86
87    for (int i = 0; i < len; ++i)
88        lower.push_back(tolower(s[i]));
89
90    return lower;
91}
92
93// Split the string s into lhs and rhs on the first occurence of the
94// character c.
95bool
96split_first(const std::string &s, std::string &lhs, std::string &rhs, char c);
97
98// Split the string s into lhs and rhs on the last occurence of the
99// character c.
100bool
101split_last(const std::string &s, std::string &lhs, std::string &rhs, char c);
102
103// Tokenize the string <s> splitting on the character <token>, and
104// place the result in the string vector <vector>.  If <ign> is true,
105// then empty result strings (due to trailing tokens, or consecutive
106// tokens) are skipped.
107void
108tokenize(std::vector<std::string> &vector, const std::string &s,
109         char token, bool ign = true);
110
111template <class T> bool
112to_number(const std::string &value, T &retval);
113
114template <class T>
115inline std::string
116to_string(const T &value)
117{
118    std::stringstream str;
119    str << value;
120    return str.str();
121}
122
123// Put quotes around string arg if it contains spaces.
124inline std::string
125quote(const std::string &s)
126{
127    std::string ret;
128    bool quote = s.find(' ') != std::string::npos;
129
130    if (quote)
131        ret = '"';
132
133    ret += s;
134
135    if (quote)
136        ret += '"';
137
138    return ret;
139}
140
141#endif //__STR_HH__
142