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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:37:15 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:37:15 +0000 |
commit | ae5d181b854d3ccb373b6bc01b4869e44ff4d87a (patch) | |
tree | 91f59efb48c56a84cc798e012fccb667b63d3fee /WWW/Library/Implementation/HTLex.c | |
parent | Initial commit. (diff) | |
download | lynx-upstream/2.9.0dev.12.tar.xz lynx-upstream/2.9.0dev.12.zip |
Adding upstream version 2.9.0dev.12.upstream/2.9.0dev.12upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'WWW/Library/Implementation/HTLex.c')
-rw-r--r-- | WWW/Library/Implementation/HTLex.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/WWW/Library/Implementation/HTLex.c b/WWW/Library/Implementation/HTLex.c new file mode 100644 index 0000000..5a0df91 --- /dev/null +++ b/WWW/Library/Implementation/HTLex.c @@ -0,0 +1,142 @@ + +/* MODULE HTLex.c + * LEXICAL ANALYSOR + * + * AUTHORS: + * AL Ari Luotonen luotonen@dxcern.cern.ch + * + * HISTORY: + * + * + * BUGS: + * + * + */ + +#include <HTUtils.h> + +#include <HTLex.h> /* Implemented here */ + +#include <LYLeaks.h> + +/* + * Global variables + */ +char HTlex_buffer[40]; /* Read lexical string */ +int HTlex_line = 1; /* Line number in source file */ + +/* + * Module-wide variables + */ +static int lex_cnt; +static BOOL lex_template; +static LexItem lex_pushed_back = LEX_NONE; +static FILE *cache = NULL; + +void unlex(LexItem lex_item) +{ + lex_pushed_back = lex_item; +} + +LexItem lex(FILE *fp) +{ + int ch = 0; + + if (fp != cache) { /* This cache doesn't work ok because the system */ + cache = fp; /* often assign same FILE structure the next open */ + HTlex_line = 1; /* file. So, if there are syntax errors in setup * + files it may confuse things later on. */ + } + if (lex_pushed_back != LEX_NONE) { + LexItem ret = lex_pushed_back; + + lex_pushed_back = LEX_NONE; + return ret; + } + + lex_cnt = 0; + lex_template = NO; + + for (;;) { + switch (ch = getc(fp)) { + case EOF: + case ' ': + case '\t': + case '\r': + case '\n': + case ':': + case ',': + case '(': + case ')': + case '@': + if (lex_cnt > 0) { + if (ch != EOF) + ungetc(ch, fp); + if (lex_template) + return LEX_TMPL_STR; + else + return LEX_ALPH_STR; + } else + switch (ch) { + case EOF: + return LEX_EOF; + case '\n': + HTlex_line++; + return LEX_REC_SEP; + case ':': + return LEX_FIELD_SEP; + case ',': + return LEX_ITEM_SEP; + case '(': + return LEX_OPEN_PAREN; + case ')': + return LEX_CLOSE_PAREN; + case '@': + return LEX_AT_SIGN; + default: /* Leading white space ignored (SP,TAB,CR) */ + break; + } + break; + default: + if (lex_cnt < (int) (sizeof(HTlex_buffer) - 1)) + HTlex_buffer[lex_cnt++] = (char) ch; + HTlex_buffer[lex_cnt] = '\0'; + if ('*' == ch) + lex_template = YES; + } /* switch ch */ + } /* forever */ +} + +const char *lex_verbose(LexItem lex_item) +{ + static char msg[sizeof(HTlex_buffer) + 30]; /* @@@@@@@@ */ + + switch (lex_item) { + case LEX_NONE: /* Internally used */ + return "NO-LEX-ITEM"; + case LEX_EOF: /* End of file */ + return "end-of-file"; + case LEX_REC_SEP: /* Record separator */ + return "record separator (newline)"; + case LEX_FIELD_SEP: /* Field separator */ + return "field separator ':'"; + case LEX_ITEM_SEP: /* List item separator */ + return "item separator ','"; + case LEX_OPEN_PAREN: /* Group start tag */ + return "'('"; + case LEX_CLOSE_PAREN: /* Group end tag */ + return "')'"; + case LEX_AT_SIGN: /* Address qualifier */ + return "address qualifier '@'"; + case LEX_ALPH_STR: /* Alphanumeric string */ + sprintf(msg, "alphanumeric string '%.*s'", + (int) sizeof(HTlex_buffer), HTlex_buffer); + return msg; + case LEX_TMPL_STR: /* Template string */ + sprintf(msg, "template string '%.*s'", + (int) sizeof(HTlex_buffer), HTlex_buffer); + return msg; + default: + return "UNKNOWN-LEX-ITEM"; + } +} |