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
|
/*
* Copyright (c) 2003, 2004 X/IO Labs, xiolabs.com.
* Copyright (c) 2003, 2004, 2005 Lev Walkin <vlm@lionet.info>.
* All rights reserved.
* Redistribution and modifications are permitted subject to BSD license.
*/
#include <asn_system.h>
#include <xer_support.h>
/* Parser states */
typedef enum {
ST_TEXT,
ST_TAG_START,
ST_TAG_BODY,
ST_TAG_QUOTE_WAIT,
ST_TAG_QUOTED_STRING,
ST_TAG_UNQUOTED_STRING,
ST_COMMENT_WAIT_DASH1, /* "<!--"[1] */
ST_COMMENT_WAIT_DASH2, /* "<!--"[2] */
ST_COMMENT,
ST_COMMENT_CLO_DASH2, /* "-->"[0] */
ST_COMMENT_CLO_RT /* "-->"[1] */
} pstate_e;
static pxml_chunk_type_e final_chunk_type[] = {
PXML_TEXT,
PXML_TAG_END,
PXML_COMMENT_END,
PXML_TAG_END,
PXML_COMMENT_END,
};
static int
_charclass[256] = {
0,0,0,0,0,0,0,0, 0,1,1,0,1,1,0,0,
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
1,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
2,2,2,2,2,2,2,2, 2,2,0,0,0,0,0,0, /* 01234567 89 */
0,3,3,3,3,3,3,3, 3,3,3,3,3,3,3,3, /* ABCDEFG HIJKLMNO */
3,3,3,3,3,3,3,3, 3,3,3,0,0,0,0,0, /* PQRSTUVW XYZ */
0,3,3,3,3,3,3,3, 3,3,3,3,3,3,3,3, /* abcdefg hijklmno */
3,3,3,3,3,3,3,3, 3,3,3,0,0,0,0,0 /* pqrstuvw xyz */
};
#define WHITESPACE(c) (_charclass[(unsigned char)(c)] == 1)
#define ALNUM(c) (_charclass[(unsigned char)(c)] >= 2)
#define ALPHA(c) (_charclass[(unsigned char)(c)] == 3)
/* Aliases for characters, ASCII/UTF-8 */
#define EXCLAM 0x21 /* '!' */
#define CQUOTE 0x22 /* '"' */
#define CDASH 0x2d /* '-' */
#define CSLASH 0x2f /* '/' */
#define LANGLE 0x3c /* '<' */
#define CEQUAL 0x3d /* '=' */
#define RANGLE 0x3e /* '>' */
#define CQUEST 0x3f /* '?' */
/* Invoke token callback */
#define TOKEN_CB_CALL(type, _ns, _current_too, _final) do { \
int _ret; \
pstate_e ns = _ns; \
ssize_t _sz = (p - chunk_start) + _current_too; \
if (!_sz) { \
/* Shortcut */ \
state = _ns; \
break; \
} \
_ret = cb(type, chunk_start, _sz, key); \
if(_ret < _sz) { \
if(_current_too && _ret == -1) \
state = ns; \
goto finish; \
} \
chunk_start = p + _current_too; \
state = ns; \
} while(0)
#define TOKEN_CB(_type, _ns, _current_too) \
TOKEN_CB_CALL(_type, _ns, _current_too, 0)
#define TOKEN_CB_FINAL(_type, _ns, _current_too) \
TOKEN_CB_CALL(final_chunk_type[_type], _ns, _current_too, 1)
/*
* Parser itself
*/
ssize_t pxml_parse(int *stateContext, const void *xmlbuf, size_t size, pxml_callback_f *cb, void *key) {
pstate_e state = (pstate_e)*stateContext;
const char *chunk_start = (const char *)xmlbuf;
const char *p = chunk_start;
const char *end = p + size;
for(; p < end; p++) {
int C = *(const unsigned char *)p;
switch(state) {
case ST_TEXT:
/*
* Initial state: we're in the middle of some text,
* or just have started.
*/
if (C == LANGLE)
/* We're now in the tag, probably */
TOKEN_CB(PXML_TEXT, ST_TAG_START, 0);
break;
case ST_TAG_START:
if (ALPHA(C) || (C == CSLASH))
state = ST_TAG_BODY;
else if (C == EXCLAM)
state = ST_COMMENT_WAIT_DASH1;
else
/*
* Not characters and not whitespace.
* Must be something like "3 < 4".
*/
TOKEN_CB(PXML_TEXT, ST_TEXT, 1);/* Flush as data */
break;
case ST_TAG_BODY:
switch(C) {
case RANGLE:
/* End of the tag */
TOKEN_CB_FINAL(PXML_TAG, ST_TEXT, 1);
break;
case LANGLE:
/*
* The previous tag wasn't completed, but still
* recognized as valid. (Mozilla-compatible)
*/
TOKEN_CB_FINAL(PXML_TAG, ST_TAG_START, 0);
break;
case CEQUAL:
state = ST_TAG_QUOTE_WAIT;
break;
}
break;
case ST_TAG_QUOTE_WAIT:
/*
* State after the equal sign ("=") in the tag.
*/
switch(C) {
case CQUOTE:
state = ST_TAG_QUOTED_STRING;
break;
case RANGLE:
/* End of the tag */
TOKEN_CB_FINAL(PXML_TAG, ST_TEXT, 1);
break;
default:
if(!WHITESPACE(C))
/* Unquoted string value */
state = ST_TAG_UNQUOTED_STRING;
}
break;
case ST_TAG_QUOTED_STRING:
/*
* Tag attribute's string value in quotes.
*/
if(C == CQUOTE) {
/* Return back to the tag state */
state = ST_TAG_BODY;
}
break;
case ST_TAG_UNQUOTED_STRING:
if(C == RANGLE) {
/* End of the tag */
TOKEN_CB_FINAL(PXML_TAG, ST_TEXT, 1);
} else if(WHITESPACE(C)) {
/* Return back to the tag state */
state = ST_TAG_BODY;
}
break;
case ST_COMMENT_WAIT_DASH1:
if(C == CDASH) {
state = ST_COMMENT_WAIT_DASH2;
} else {
/* Some ordinary tag. */
state = ST_TAG_BODY;
}
break;
case ST_COMMENT_WAIT_DASH2:
if(C == CDASH) {
/* Seen "<--" */
state = ST_COMMENT;
} else {
/* Some ordinary tag */
state = ST_TAG_BODY;
}
break;
case ST_COMMENT:
if(C == CDASH) {
state = ST_COMMENT_CLO_DASH2;
}
break;
case ST_COMMENT_CLO_DASH2:
if(C == CDASH) {
state = ST_COMMENT_CLO_RT;
} else {
/* This is not an end of a comment */
state = ST_COMMENT;
}
break;
case ST_COMMENT_CLO_RT:
if(C == RANGLE) {
TOKEN_CB_FINAL(PXML_COMMENT, ST_TEXT, 1);
} else if(C == CDASH) {
/* Maintain current state, still waiting for '>' */
} else {
state = ST_COMMENT;
}
break;
} /* switch(*ptr) */
} /* for() */
/*
* Flush the partially processed chunk, state permitting.
*/
if(p - chunk_start) {
switch (state) {
case ST_COMMENT:
TOKEN_CB(PXML_COMMENT, state, 0);
break;
case ST_TEXT:
TOKEN_CB(PXML_TEXT, state, 0);
break;
default: break; /* a no-op */
}
}
finish:
*stateContext = (int)state;
return chunk_start - (const char *)xmlbuf;
}
|