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/* 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";
}
}
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