vlm | 9de248e | 2004-10-20 15:50:55 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2003, 2004 X/IO Labs, xiolabs.com. |
| 3 | * Copyright (c) 2003, 2004 Lev Walkin <vlm@lionet.info>. All rights reserved. |
| 4 | * Redistribution and modifications are permitted subject to BSD license. |
| 5 | */ |
| 6 | #include <assert.h> |
| 7 | #include <errno.h> |
| 8 | #include <stdlib.h> |
| 9 | #include <stdio.h> |
| 10 | #include <sys/types.h> |
| 11 | |
| 12 | #include <xer_support.h> |
| 13 | |
| 14 | /* Parser states */ |
| 15 | typedef enum { |
| 16 | ST_TEXT, |
| 17 | ST_TAG_START, |
| 18 | ST_TAG_BODY, |
| 19 | ST_TAG_QUOTE_WAIT, |
| 20 | ST_TAG_QUOTED_STRING, |
| 21 | ST_TAG_UNQUOTED_STRING, |
| 22 | ST_COMMENT_WAIT_DASH1, // "<!--"[1] |
| 23 | ST_COMMENT_WAIT_DASH2, // "<!--"[2] |
| 24 | ST_COMMENT, |
| 25 | ST_COMMENT_CLO_DASH2, // "-->"[0] |
| 26 | ST_COMMENT_CLO_RT // "-->"[1] |
| 27 | } pstate_e; |
| 28 | |
| 29 | static pxml_chunk_type_e final_chunk_type[] = { |
| 30 | PXML_TEXT, |
| 31 | PXML_TAG_END, |
| 32 | PXML_COMMENT_END, |
| 33 | PXML_TAG_END, |
| 34 | PXML_COMMENT_END, |
| 35 | }; |
| 36 | |
| 37 | |
| 38 | static int |
| 39 | _charclass[256] = { |
| 40 | 0,0,0,0,0,0,0,0, 0,1,1,0,1,1,0,0, |
| 41 | 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, |
| 42 | 1,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, |
| 43 | 2,2,2,2,2,2,2,2, 2,2,0,0,0,0,0,0, /* 01234567 89 */ |
| 44 | 0,3,3,3,3,3,3,3, 3,3,3,3,3,3,3,3, /* ABCDEFG HIJKLMNO */ |
| 45 | 3,3,3,3,3,3,3,3, 3,3,3,0,0,0,0,0, /* PQRSTUVW XYZ */ |
| 46 | 0,3,3,3,3,3,3,3, 3,3,3,3,3,3,3,3, /* abcdefg hijklmno */ |
| 47 | 3,3,3,3,3,3,3,3, 3,3,3,0,0,0,0,0 /* pqrstuvw xyz */ |
| 48 | }; |
| 49 | #define WHITESPACE(c) (_charclass[(unsigned char)(c)] == 1) |
| 50 | #define ALNUM(c) (_charclass[(unsigned char)(c)] >= 2) |
| 51 | #define ALPHA(c) (_charclass[(unsigned char)(c)] == 3) |
| 52 | |
| 53 | /* Aliases for characters, ASCII/UTF-8 */ |
| 54 | #define EXCLAM 0x21 /* '!' */ |
| 55 | #define CQUOTE 0x22 /* '"' */ |
| 56 | #define CDASH 0x2d /* '-' */ |
| 57 | #define CSLASH 0x2f /* '/' */ |
| 58 | #define LANGLE 0x3c /* '<' */ |
| 59 | #define CEQUAL 0x3d /* '=' */ |
| 60 | #define RANGLE 0x3e /* '>' */ |
| 61 | |
| 62 | /* Invoke token callback */ |
| 63 | #define TOKEN_CB_CALL(type, _ns, _current_too, _final) do { \ |
| 64 | int _ret; \ |
| 65 | pstate_e ns = _ns; \ |
| 66 | ssize_t _sz = (p - chunk_start) + _current_too; \ |
| 67 | if (!_sz) { \ |
| 68 | /* Shortcut */ \ |
| 69 | state = _ns; \ |
| 70 | break; \ |
| 71 | } \ |
| 72 | _ret = cb(type, chunk_start, _sz, key); \ |
| 73 | if(_ret < _sz) { \ |
| 74 | if(_current_too && _ret == -1) \ |
| 75 | state = ns; \ |
| 76 | goto finish; \ |
| 77 | } \ |
| 78 | chunk_start = p + _current_too; \ |
| 79 | state = ns; \ |
| 80 | } while(0) |
| 81 | |
| 82 | #define TOKEN_CB(_type, _ns, _current_too) \ |
| 83 | TOKEN_CB_CALL(_type, _ns, _current_too, 0) |
| 84 | |
| 85 | #define TOKEN_CB_FINAL(_type, _ns, _current_too) \ |
| 86 | TOKEN_CB_CALL(final_chunk_type[_type], _ns, _current_too, 1) |
| 87 | |
| 88 | /* |
| 89 | * Parser itself |
| 90 | */ |
vlm | 6c59384 | 2004-10-26 09:03:31 +0000 | [diff] [blame] | 91 | ssize_t pxml_parse(int *stateContext, void *xmlbuf, size_t size, pxml_callback_f *cb, void *key) { |
vlm | 9de248e | 2004-10-20 15:50:55 +0000 | [diff] [blame] | 92 | pstate_e state = (pstate_e)*stateContext; |
| 93 | char *chunk_start = (char *)xmlbuf; |
| 94 | char *p = chunk_start; |
| 95 | char *end = p + size; |
| 96 | |
| 97 | for(; p < end; p++) { |
| 98 | int C = *(unsigned char *)p; |
| 99 | switch(state) { |
| 100 | case ST_TEXT: |
| 101 | /* |
| 102 | * Initial state: we're in the middle of some text, |
| 103 | * or just have started. |
| 104 | */ |
| 105 | if (C == LANGLE) |
| 106 | /* We're now in the tag, probably */ |
| 107 | TOKEN_CB(PXML_TEXT, ST_TAG_START, 0); |
| 108 | break; |
| 109 | case ST_TAG_START: |
| 110 | if (ALPHA(C) || (C == CSLASH)) |
| 111 | state = ST_TAG_BODY; |
| 112 | else if (C == EXCLAM) |
| 113 | state = ST_COMMENT_WAIT_DASH1; |
| 114 | else |
| 115 | /* |
| 116 | * Not characters and not whitespace. |
| 117 | * Must be something like "3 < 4". |
| 118 | */ |
| 119 | TOKEN_CB(PXML_TEXT, ST_TEXT, 1);/* Flush as data */ |
| 120 | break; |
| 121 | case ST_TAG_BODY: |
| 122 | switch(C) { |
| 123 | case RANGLE: |
| 124 | /* End of the tag */ |
| 125 | TOKEN_CB_FINAL(PXML_TAG, ST_TEXT, 1); |
| 126 | break; |
| 127 | case LANGLE: |
| 128 | /* |
| 129 | * The previous tag wasn't completed, but still |
| 130 | * recognized as valid. (Mozilla-compatible) |
| 131 | */ |
| 132 | TOKEN_CB_FINAL(PXML_TAG, ST_TAG_START, 0); |
| 133 | break; |
| 134 | case CEQUAL: |
| 135 | state = ST_TAG_QUOTE_WAIT; |
| 136 | break; |
| 137 | } |
| 138 | break; |
| 139 | case ST_TAG_QUOTE_WAIT: |
| 140 | /* |
| 141 | * State after the equal sign ("=") in the tag. |
| 142 | */ |
| 143 | switch(C) { |
| 144 | case CQUOTE: |
| 145 | state = ST_TAG_QUOTED_STRING; |
| 146 | break; |
| 147 | case RANGLE: |
| 148 | /* End of the tag */ |
| 149 | TOKEN_CB_FINAL(PXML_TAG, ST_TEXT, 1); |
| 150 | break; |
| 151 | default: |
| 152 | if(!WHITESPACE(C)) |
| 153 | /* Unquoted string value */ |
| 154 | state = ST_TAG_UNQUOTED_STRING; |
| 155 | } |
| 156 | break; |
| 157 | case ST_TAG_QUOTED_STRING: |
| 158 | /* |
| 159 | * Tag attribute's string value in quotes. |
| 160 | */ |
| 161 | if(C == CQUOTE) { |
| 162 | /* Return back to the tag state */ |
| 163 | state = ST_TAG_BODY; |
| 164 | } |
| 165 | break; |
| 166 | case ST_TAG_UNQUOTED_STRING: |
| 167 | if(C == RANGLE) { |
| 168 | /* End of the tag */ |
| 169 | TOKEN_CB_FINAL(PXML_TAG, ST_TEXT, 1); |
| 170 | } else if(WHITESPACE(C)) { |
| 171 | /* Return back to the tag state */ |
| 172 | state = ST_TAG_BODY; |
| 173 | } |
| 174 | break; |
| 175 | case ST_COMMENT_WAIT_DASH1: |
| 176 | if(C == CDASH) { |
| 177 | state = ST_COMMENT_WAIT_DASH2; |
| 178 | } else { |
| 179 | /* Some ordinary tag. */ |
| 180 | state = ST_TAG_BODY; |
| 181 | } |
| 182 | break; |
| 183 | case ST_COMMENT_WAIT_DASH2: |
| 184 | if(C == CDASH) { |
| 185 | /* Seen "<--" */ |
| 186 | state = ST_COMMENT; |
| 187 | } else { |
| 188 | /* Some ordinary tag */ |
| 189 | state = ST_TAG_BODY; |
| 190 | } |
| 191 | break; |
| 192 | case ST_COMMENT: |
| 193 | if(C == CDASH) { |
| 194 | state = ST_COMMENT_CLO_DASH2; |
| 195 | } |
| 196 | break; |
| 197 | case ST_COMMENT_CLO_DASH2: |
| 198 | if(C == CDASH) { |
| 199 | state = ST_COMMENT_CLO_RT; |
| 200 | } else { |
| 201 | /* This is not an end of a comment */ |
| 202 | state = ST_COMMENT; |
| 203 | } |
| 204 | break; |
| 205 | case ST_COMMENT_CLO_RT: |
| 206 | if(C == RANGLE) { |
| 207 | TOKEN_CB_FINAL(PXML_COMMENT, ST_TEXT, 1); |
| 208 | } else { |
| 209 | state = ST_COMMENT; |
| 210 | } |
| 211 | break; |
| 212 | } /* switch(*ptr) */ |
| 213 | } /* for() */ |
| 214 | |
| 215 | /* |
| 216 | * Flush the partially processed chunk, state permitting. |
| 217 | */ |
| 218 | if(p - chunk_start) { |
| 219 | switch (state) { |
| 220 | case ST_COMMENT: |
| 221 | TOKEN_CB(PXML_COMMENT, state, 0); |
| 222 | break; |
| 223 | case ST_TEXT: |
| 224 | TOKEN_CB(PXML_TEXT, state, 0); |
| 225 | break; |
| 226 | default: break; /* a no-op */ |
| 227 | } |
| 228 | } |
| 229 | |
| 230 | finish: |
| 231 | *stateContext = (int)state; |
| 232 | return chunk_start - (char *)xmlbuf; |
| 233 | } |
| 234 | |