/* Scanner for Wikipedia language. Built with flex. */
CARRIAGERETURN \r
CARRIAGERETURN_DOUBLE \r\n\r
VALIDURLCHARS [a-z0-9\%\/\?\:\@\=\&\$\_\-\+\!\*\'\(\)\,\.]
NEWPARAGRAPH \n\n
MATH <math>
MATH_END <\/math>
NOWIKI <nowiki>
NOWIKI_END <\/nowiki>
GENERICLINK [a-z]+:\/\/{VALIDURLCHARS}+
TITLEDLINK \133{GENERICLINK}\ [^\133]*\135
WIKILINK \133{2}[^\135]+\135{2}
CURRENTDAY \{\{CURRENTDAY\}\}
CURRENTMONTH \{\{CURRENTMONTH\}\}
CURRENTTIME \{\{CURRENTTIME\}\}
CURRENTYEAR \{\{CURRENTYEAR\}\}
LIST \n[\:\#\;\*]
PRE ^\040
PRE_END \n[^\040]
HR ^----
H1 ={1}
H2 ={2}
H3 ={3}
H4 ={4}
H5 ={5}
H6 ={6}
EMPHASIZE '{2}
SEMPHASIZE '{3}
VSEMPHASIZE '{5}
LESSERTHAN <
GREATERTHAN >
%option caseless stack
%s list pre
%x math nowiki
%{
#include <time.h>
#include <sys/types.h>
#define MAXLIST 32
%}
%%
%{
/* State variable positions (int state[10]):
0 = pre
1 = h1
2 = h2
3 = h3
4 = h4
5 = h5
6 = h6
7 = emphasis
8 = strong emphasis
9 = very strong emphasis */
int state[10];
/* Temporary variables. */
int i;
char j;
/* A string used for holding the current content of a list (like *#*) */
char listtext[MAXLIST] = "\0";
/* The variables needed for CURRENTTIME-like substitutions. */
time_t time_since_epoch;
struct tm cur_time;
/* Set all state variables to 0. */
for (i=0; i<10; i++) { state[i] = 0; }
/* Get the time once at execution of program, instead of every call. */
time(&time_since_epoch);
gmtime_r(&time_since_epoch, &cur_time);
%}
{CARRIAGERETURN_DOUBLE} { unput('\n'); }
{CARRIAGERETURN}
{WIKILINK} { ECHO; }
{NOWIKI} { yy_push_state(nowiki); }
<nowiki>{NOWIKI_END} { yy_pop_state(); }
<nowiki>{LESSERTHAN} { printf("<"); }
<nowiki>{GREATERTHAN} { printf(">"); }
{MATH} { yy_push_state(math); }
<math>{MATH_END} { yy_pop_state(); }
{PRE} {
if (state[0] == 0) { printf("\n<pre>"); state[0]++; yy_push_state(pre); }
}
<pre>{PRE_END} { printf("</pre>"); state[0]--; yyless(0); yy_pop_state(); }
{HR} { printf("\n<hr>"); }
{NEWPARAGRAPH} { printf("\n<p>"); unput('\n'); }
{VSEMPHASIZE} {
if (state[9] == 0) { printf("<strong><em>"); state[9]++; }
else { printf("</strong></em>"); state[9]--; }
}
{SEMPHASIZE} {
if (state[8] == 0) { printf("<strong>"); state[8]++; }
else { printf("</strong>"); state[8]--; }
}
{EMPHASIZE} {
if (state[7] == 0) { printf("<em>"); state[7]++; }
else { printf("</em>"); state[7]--; }
}
{H6} {
if (state[6] == 0) { printf("<h6>"); state[6]++; }
else { printf("</h6>"); state[6]--; }
}
{H5} {
if (state[5] == 0) { printf("<h5>"); state[5]++; }
else { printf("</h5>"); state[5]--; }
}
{H4} {
if (state[4] == 0) { printf("<h4>"); state[4]++; }
else { printf("</h4>"); state[4]--; }
}
{H3} {
if (state[3] == 0) { printf("<h3>"); state[3]++; }
else { printf("</h3>"); state[3]--; }
}
{H2} {
if (state[2] == 0) { printf("<h2>"); state[2]++; }
else { printf("</h2>"); state[2]--; }
}
{H1} {
if (state[1] == 0) { printf("<h1>"); state[1]++; }
else { printf("</h1>"); state[1]--; }
}
{TITLEDLINK} {
printf("<a href=\"");
while (*++yytext != ' ') { printf("%c", *yytext); } /* Print everything up to first space */
printf("\">");
while (*++yytext != ']') { printf("%c", *yytext); } /* Print href text */
printf("</a>");
}
{GENERICLINK} {
printf("<a href=\"");
j = *(yytext + yyleng - 1);
/* If the last character of a URL is a '.' or a ',', assume it is punctuation. */
if ((j == '.') || (j == ','))
{
*(yytext + yyleng - 1) = '\0';
printf("%s\">%s</a>%c", yytext, yytext, j);
}
else { printf("%s\">%s</a>", yytext, yytext); }
}
{CURRENTTIME} { printf("%d:%d", cur_time.tm_hour, cur_time.tm_min); }
{CURRENTDAY} { printf("%d", cur_time.tm_mday); }
{CURRENTMONTH} { printf("%.2d", (cur_time.tm_mon + 1)); }
{CURRENTYEAR} { printf("%d", (cur_time.tm_year + 1900)); }
{LIST} {
if (strlen(yytext) < MAXLIST)
{
strcpy(listtext, yytext);
/*
i = 0;
while(listtext[i] != '\0') {}
*/
}
}
%%
int main (int argc, char **argv)
{
++argv, --argc; /* Don't care about name of program. */
yyin = fopen(argv[0], "r");
yylex();
return 0;
}
