1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
// NREX: Node RegEx
//
// Copyright (c) 2015, Zher Huei Lee
// All rights reserved.
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would
// be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
// be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//
#ifndef NREX_HPP
#define NREX_HPP
#include "nrex_config.h"
#ifdef NREX_UNICODE
typedef wchar_t nrex_char;
#else
typedef char nrex_char;
#endif
/*!
* \brief Struct to contain the range of a capture result
*
* The range provided is relative to the begining of the searched string.
*
* \see nrex_node::match()
*/
struct nrex_result
{
public:
int start; /*!< Start of text range */
int length; /*!< Length of text range */
};
class nrex_node;
/*!
* \brief Holds the compiled regex pattern
*/
class nrex
{
private:
int _capturing;
nrex_node* _root;
public:
nrex();
~nrex();
/*!
* \brief Removes the compiled regex and frees up the memory
*/
void reset();
/*!
* \brief Checks if there is a compiled regex being stored
* \return True if present, False if not present
*/
bool valid() const;
/*!
* \brief Provides number of captures the compiled regex uses
*
* This is used to provide the array size of the captures needed for
* nrex::match() to work. The size is actually the number of capture
* groups + one for the matching of the entire pattern. The result is
* always capped at 10 or 100, depending on the extend option given in
* nrex::compile() (default 10).
*
* \return The number of captures
*/
int capture_size() const;
/*!
* \brief Compiles the provided regex pattern
*
* This automatically removes the existing compiled regex if already
* present.
*
* If the NREX_THROW_ERROR was defined it would automatically throw a
* runtime error nrex_compile_error if it encounters a problem when
* parsing the pattern.
*
* \param pattern The regex pattern
* \param extended If true, raises the limit on number of capture
* groups and back-references to 99. Otherwise limited
* to 9. Defaults to false.
* \return True if the pattern was succesfully compiled
*/
bool compile(const nrex_char* pattern, bool extended = false);
/*!
* \brief Uses the pattern to search through the provided string
* \param str The text to search through. It only needs to be
* null terminated if the end point is not provided.
* This also determines the starting anchor.
* \param captures The array of results to store the capture results.
* The size of that array needs to be the same as the
* size given in nrex::capture_size(). As it matches
* the function fills the array with the results. 0 is
* the result for the entire pattern, 1 and above
* corresponds to the regex capture group if present.
* \param offset The starting point of the search. This does not move
* the starting anchor. Defaults to 0.
* \param end The end point of the search. This also determines
* the ending anchor. If a number less than the offset
* is provided, the search would be done until null
* termination. Defaults to -1.
* \return True if a match was found. False otherwise.
*/
bool match(const nrex_char* str, nrex_result* captures, int offset = 0, int end = -1) const;
};
#ifdef NREX_THROW_ERROR
#include <stdexcept>
class nrex_compile_error : std::runtime_error
{
public:
nrex_compile_error(const char* message)
: std::runtime_error(message)
{
}
~nrex_compile_error() throw()
{
}
};
#endif
#endif // NREX_HPP
|