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
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
|
/******************************************************************************
** $Id: s_parse.c,v 1.10 2012-01-29 15:50:05 gene Exp $
**=============================================================================
**
** This file is part of BibTool.
** It is distributed under the GNU General Public License.
** See the file COPYING for details.
**
** (c) 1996-2012 Gerd Neugebauer
**
** Net: gene@gerd-neugebauer.de
**
******************************************************************************/
#include <bibtool/general.h>
#include <bibtool/symbols.h>
#include <bibtool/error.h>
#include <bibtool/parse.h>
#include <bibtool/s_parse.h>
/*****************************************************************************/
/* Internal Programs */
/*===========================================================================*/
#ifdef __STDC__
#define _ARG(A) A
#else
#define _ARG(A) ()
#endif
Uchar * s_parse _ARG((int type,Uchar **sp,int errp));/* s_parse.c */
int sp_open _ARG((Uchar * s)); /* s_parse.c */
void sp_close _ARG((void)); /* s_parse.c */
void sp_error _ARG((Uchar *s,char *a,char *b)); /* s_parse.c */
/*****************************************************************************/
/* External Programs */
/*===========================================================================*/
/*---------------------------------------------------------------------------*/
#define Error(E,S,A,B) \
if(E) error(ERR_ERROR|ERR_POINT,(Uchar*)A,(Uchar*)B,(Uchar*)0,sp_line,(Uchar*)S,0,(char*)0)
static Uchar *sp_line = NULL;
/*-----------------------------------------------------------------------------
** Function: sp_open()
** Purpose: Open a string for parsing. The argument string is used
** for the parsing process. Thus this string should not
** be modified during this time. Especially it should
** not be freed if it is a pointer to dynamically
** allocated memory.
** Arguments:
** s String to open for parsing.
** Returns: |TRUE|
**___________________________________________________ */
int sp_open(s) /* */
Uchar *s; /* */
{ sp_line = s; /* */
return TRUE; /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: s_parse()
** Purpose: Parse a string for a certain entity. Leading
** whitespace is ignored. |type| determines which kind of
** entity should be exepected. It can take the following
** values which are defined in |s_parse.h|:
** \begin{description}
** \item[StringParseValue] The string is analyzed and the
** proper type is determined automatically. This can be
** considered as the normal way of operation.
** \item[StringParseSymbol] The string is analyzed and
** only a symbol is accepted, i.e.\ a sequence of
** allowed characters.
** \item[StringParseNumber] The string is analyzed and
** only a number is accepted.
** \item[StringParseBraces] The string is analyzed and
** only an expression in braces is accepted. The braced
** contained must come in matching pairs. The whole
** expression -- including the braces -- is returned.
** \item[StringParseUnquotedBraces] The string is analyzed and
** only an expression in braces is accepted. The braced
** contained must come in matching pairs. The
** expression without the outer braces is returned.
** \item[StringParseString] The string is analyzed and
** only a string enclosed in double quotes is
** accepted. The string must contain braces in matching
** pairs. Double quotes which are inside of braces are
** not considered as end of the string. The whole
** string -- including the double quotes is returned.
** \item[StringParseUnquotedString] The string is analyzed and
** only a string enclosed in double quotes is
** accepted. The string must contain braces in matching
** pairs. Double quotes which are inside of braces are
** not considered as end of the string. The string
** without the outer double quotes is returned.
** \item[StringParseSkip] The string is analyzed and the
** first position not containing whitespace, |=|, or |#|
** is returned. In this case the returned value is not
** translated into a symbol.
** \item[StringParseEOS] The string is analyzed and any
** remaining characters which are not whitespace are
** reported as error. A pointer to the terminating 0 byte
** is returned upon success
** \end{description}
** If an error occurs or the requested entity is not
** found then |NULL| is returned. As a side effect |sp|
** is advanced to point to the next unprocessed
** character.
**
** The string analyzed should be opened at the beginning
** with |sp_open()| in order to get an appropriate error
** message.
**
** This function is usually not called directly but the
** convenience macros defined in |s_parse.h| should be
** used instead.
** Arguments:
** type is the type of construct to parse. it is defined in s_parse.h
** sp is a pointer to the string which is parsed. The value is
** changed to hold the remaining characters at the end.
** errp this boolean indicated whether or not a verbose error
** message should be created in case of an error.
** Returns: A symbol containing the requested entity or |NULL|.
**___________________________________________________ */
Uchar * s_parse(type,sp,errp) /* */
int type; /* */
Uchar **sp; /* */
int errp; /* */
{ register Uchar *s = *sp; /* */
Uchar c; /* */
char *cp; /* */
static char *unexpected = "Unexpected "; /* */
static char *expected = " expected."; /* */
/* */
DebugPrint2((type == StringParseSkip ? "ParseSkip ":
type == StringParseNext ? "ParseNext ":
type == StringParseNumber ? "ParseNumber ":
type == StringParseSymbol ? "ParseSymbol ":
type == StringParseString ? "ParseString ":
type == StringParseUnquotedString ? "ParseUnquotedString ":
type == StringParseBraces ? "ParseBraces ":
type == StringParseUnquotedBraces ? "ParseUnquotedBraces ":
type == StringParseEOS ? "ParseEOS ":
type == StringParseValue ? "ParseValue ":
"???"),s); /* */
while( is_space(*s) ) s++; /* */
*sp = s; /* */
/* */
switch ( type ) /* */
{ case StringParseSymbol: /* */
if ( is_allowed(*s) ) /* */
{ do { s++; } while ( is_allowed(*s) ); /* */
} /* */
else /* */
{ Error(errp,s,"Symbol",expected); /* */
return NULL; /* */
} /* */
break; /* */
/* */
case StringParseNumber: /* */
if ( is_digit(*s) ) /* */
{ do { s++; } while ( is_digit(*s) ); /* */
} /* */
else /* */
{ Error(errp,s,"Number",expected); /* */
return NULL; /* */
} /* */
break; /* */
/* */
case StringParseBraces: /* */
case StringParseUnquotedBraces: /* */
if ( *s != '{' ) /* */
{ Error(errp,s,"Brace",expected); /* */
return NULL; /* */
} /* */
s++; /* */
if ( type == StringParseUnquotedBraces ) /* */
{ *sp = s; } /* */
{ int level = 1; /* */
/* */
while ( *s && level > 0 ) /* */
{ /* */
switch ( *s ) /* */
{ case '{': level++; break; /* */
case '}': --level; break; /* */
case '"': /* */
s++; /* */
while (*s && *s != '"') /* */
{ if (*s == '\\' && *++s ) s++; /* */
else s++; /* */
} /* */
break; /* */
} /* */
if ( *s ) s++; /* */
} /* */
if ( level > 0 ) /* */
{ Error(errp,s,unexpected,"end of braces.");/* */
} /* */
else if ( type==StringParseUnquotedBraces )/* */
{ s--; } /* */
} /* */
break; /* */
/* */
case StringParseString: /* */
case StringParseUnquotedString: /* */
if ( *s != '"' ) /* */
{ Error(errp,s,"String",expected); /* */
return NULL; /* */
} /* */
s++; /* */
if ( type == StringParseUnquotedString ) /* */
{ *sp = s; } /* */
/* */
while ( *s && *s != '"' ) /* */
{ if ( *s == '\\' && *(s+1) != '\0' ) s += 2;/* */
else ++s; /* */
} /* */
/* */
if ( *s == '"' ) /* */
{ if ( type != StringParseUnquotedString ) s++;/* */
} /* */
else /* */
{ Error(errp,s,unexpected,"end of string."); /* */
} /* */
break; /* */
/* */
case StringParseSkip: /* */
while( is_space(*s) /* */
|| *s == '=' /* */
|| *s == '#' ) s++; /* */
*sp = s; /* */
return s; /* */
/* */
case StringParseValue: /* */
switch ( *s ) /* */
{ case '"': /* */
return s_parse(StringParseUnquotedString,sp,errp);/* */
case '{': /* */
return s_parse(StringParseUnquotedBraces,sp,errp);/* */
case '0': case '1': case '2': case '3': /* */
case '4': case '5': case '6': case '7': /* */
case '8': case '9': /* */
return s_parse(StringParseNumber,sp,errp);/* */
default: /* */
return s_parse(StringParseSymbol,sp,errp);/* */
} /* */
break; /* */
/* */
case StringParseEOS: /* */
if ( *s ) /* */
{ Error(errp,s,unexpected,"characters at end of string.");/* */
} /* */
/* */
sp_line = NULL; /* */
return (*s?s:NULL); /* */
/* */
default: /* */
return NULL; /* */
} /* */
/* */
c = *s; /* */
*s = '\0'; /* */
cp = new_string((char*)*sp); /* */
*s = c; /* */
if ( type == StringParseUnquotedString /* */
|| type == StringParseUnquotedBraces ) s++; /* */
*sp = s; /* */
if ( type == StringParseSymbol ) /* */
{ (void)lower((Uchar*)cp); } /* */
/* */
{ Uchar *sym = symbol((Uchar*)cp); /* */
free(cp); /* */
return sym; /* */
} /* */
} /*------------------------*/
|
