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
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
/*
www.sourceforge.net/projects/tinyxpath
Copyright (c) 2002-2004 Yves Berquin (yvesb@users.sourceforge.net)
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.
*/
/**
\file xpath_stream.h
\author Yves Berquin
Specialized byte stream for the TinyXPath project
*/
#ifndef __TINYXPSTREAM_H
#define __TINYXPSTREAM_H
#include "lex_util.h"
#include "byte_stream.h"
#include "xpath_syntax.h"
#include "tinyxml.h"
namespace TinyXPath
{
/**
A specialized version of byte_stream for XPath
*/
class xpath_stream : public byte_stream
{
protected :
/// List of tokens
token_syntax_decoder * tlp_list;
public :
/// constructor
xpath_stream (const char * cp_in);
/// destructor
virtual ~ xpath_stream ()
{
delete tlp_list;
}
/// Decode the byte stream, and construct the lexical list
void v_lexico_decode ()
{
enum {s_init, s_ncname, s_number, s_literal_1, s_literal_2, s_end} state;
lexico lex_new, lex_next;
unsigned u_size;
bool o_dot_in_number;
u_size = 0;
o_dot_in_number = false;
state = s_init;
while (state != s_end)
{
lex_next = lex_get_class (b_top ());
switch (state)
{
case s_init :
switch (lex_next)
{
case lex_bchar :
case lex_under :
// [XML:4] NCName ::= (Letter | '_') (NCNameChar)*
u_size = 1;
state = s_ncname;
b_pop ();
break;
case lex_null :
state = s_end;
break;
case lex_digit :
u_size = 1;
state = s_number;
o_dot_in_number = false;
b_pop ();
break;
case lex_dot :
if (lex_get_class (b_forward (1)) == lex_digit)
{
// [30] Number ::= Digits ('.' Digits?)? | '.' Digits
// [31] Digits ::= [0-9]+
u_size = 1;
state = s_number;
o_dot_in_number = true;
b_pop ();
}
else
{
tlp_list -> v_add_token (lex_next, bp_get_backward (1), 1);
b_pop ();
}
break;
case lex_1_quote :
// [29] Literal ::= '"' [^"]* '"' | "'" [^']* "'"
u_size = 0;
b_pop ();
state = s_literal_1;
break;
case lex_2_quote :
// [29] Literal ::= '"' [^"]* '"' | "'" [^']* "'"
u_size = 0;
b_pop ();
state = s_literal_2;
break;
default :
tlp_list -> v_add_token (lex_next, bp_get_backward (1), 1);
b_pop ();
break;
}
break;
case s_literal_1 :
// [29] Literal ::= '"' [^"]* '"' | "'" [^']* "'"
switch (lex_next)
{
case lex_1_quote :
tlp_list -> v_add_token (lex_literal, bp_get_backward (u_size + 1), u_size);
b_pop ();
state = s_init;
break;
default :
u_size++;
b_pop ();
break;
}
break;
case s_literal_2 :
// [29] Literal ::= '"' [^"]* '"' | "'" [^']* "'"
switch (lex_next)
{
case lex_2_quote :
tlp_list -> v_add_token (lex_literal, bp_get_backward (u_size + 1), u_size);
b_pop ();
state = s_init;
break;
default :
u_size++;
b_pop ();
break;
}
break;
case s_ncname :
switch (lex_next)
{
// [XML:5] NCNameChar ::= Letter | Digit | '.' | '-' | '_' | CombiningChar | Extender
case lex_bchar :
case lex_digit :
case lex_dot :
case lex_minus :
case lex_under :
case lex_extend :
u_size++;
b_pop ();
break;
default :
lex_new = lex_test_id (bp_get_backward (u_size + 1), u_size, lex_next);
tlp_list -> v_add_token (lex_new, bp_get_backward (u_size + 1), u_size);
state = s_init;
break;
}
break;
case s_number :
switch (lex_next)
{
// [30] Number ::= Digits ('.' Digits?)? | '.' Digits
// [31] Digits ::= [0-9]+
case lex_dot :
if (o_dot_in_number)
{
tlp_list -> v_add_token (lex_number, bp_get_backward (u_size + 1), u_size);
state = s_init;
}
else
{
o_dot_in_number = true;
u_size++;
b_pop ();
}
break;
case lex_digit :
u_size++;
b_pop ();
break;
default :
tlp_list -> v_add_token (lex_number, bp_get_backward (u_size + 1), u_size);
state = s_init;
break;
}
break;
// jan 21th, 07 - neoneurone: silently ignore the other cases
default:
break;
}
if (lex_next == lex_null)
state = s_end;
}
}
/// Evaluate a XPath expression \n
/// Decodes the lexical and syntax contents.
void v_evaluate ()
{
v_lexico_decode ();
tlp_list -> v_syntax_decode ();
}
/// Callback used by token_syntax_decoder::v_syntax_decode to notify of an action to be made. Pure virtual
virtual void v_action (xpath_construct , unsigned , unsigned , const char * ) = 0;
/// Callback used by token_syntax_decoder::v_syntax_decode to know the action counter position. Pure virtual
/// \n This can be any kind of nomenclature, provided that the redefinition is coherent
virtual int i_get_action_counter () = 0;
} ; // class xpath_stream
}
#endif
|
