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language.y
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language.y
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%code requires {
int yylex();
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <ctype.h>
#include <unistd.h>
#include "regexexpression.h"
#include "vector.h"
typedef struct regexexpression returnstruct;
void yyerror(returnstruct * r, char *s);
int maxcharactercount;
}
%union { int num; int range[2]; char c; struct regexexpression rexpression; struct regexrange rrange; struct regexoptions roptions; struct regexcharactergroup rcgroup; struct regexcharacter rcharacter; struct vector list; }
%start begin
%token leftbox
%token rightbox
%token leftparanthesis
%token rightparanthesis
%token dot
%token <range> rangetoken
%token <c> character
%type <rexpression> parseexpresssion
%type <list> parseexpresssionmid
%type <rrange> parserange
%type <roptions> parseoption
%type <list> parseoptionmid
%type <rcgroup> parsecharactergroup
%type <list> parsecharactergroupmid
%type <rcharacter> parsecharacter
%parse-param {returnstruct *r}
%%
begin : parseexpresssion { *r = $1; return 0; }
;
parseexpresssion : parseexpresssionmid { struct regexexpression g; g.ranges = $1; $$ = g; }
;
parseexpresssionmid : parseexpresssionmid parserange { vector_push(&$1, &$2); $$ = $1; }
| parserange {
struct vector v;
vector_init(&v, sizeof(struct regexrange));
vector_push(&v, &$1);
$$ = v;
}
;
parserange : parseoption rangetoken {
struct regexrange range;
range.baseoption = $1;
vector_init(&range.options, sizeof(struct regexoptions));
range.minlen = $2[0];
range.maxlen = $2[1];
$$ = range;
}
| parseoption {
struct regexrange range;
range.baseoption = $1;
vector_init(&range.options, sizeof(struct regexoptions));
range.minlen = 1;
range.maxlen = 1;
$$ = range;
}
;
parseoption : leftbox parseoptionmid rightbox {
struct regexoptions g;
g.index = 0;
g.groups = $2;
$$ = g;
}
| dot {
struct regexoptions ro;
regexoptions_init(&ro);
struct regexcharactergroup g;
regexcharactergroup_init(&g);
struct regexcharacter c;
c.minc = 0;
c.maxc = 126;
c.currentc = 0;
regexcharactergroup_push(&g, c);
regexoptions_push(&ro, g);
$$ = ro;
}
| parsecharactergroup {
struct regexoptions g;
g.index = 0;
vector_init(&g.groups, sizeof(struct regexcharactergroup));
regexoptions_push(&g, $1);
$$ = g;
}
;
parseoptionmid : parseoptionmid parsecharactergroup { vector_push(&$1, &$2); $$ = $1; }
| parsecharactergroup {
struct vector v;
vector_init(&v, sizeof(struct regexcharactergroup));
vector_push(&v, &$1);
$$ = v;
}
;
parsecharactergroup : leftparanthesis parsecharactergroupmid rightparanthesis {
struct regexcharactergroup g;
g.characters = $2; $$ = g;
}
| parsecharacter {
struct regexcharactergroup g;
regexcharactergroup_init(&g);
regexcharactergroup_push(&g, $1);
$$ = g;
}
;
parsecharactergroupmid : parsecharactergroupmid parsecharacter { vector_push(&$1, &$2); $$ = $1; }
| parsecharacter {
struct vector v;
vector_init(&v, sizeof(struct regexcharacter));
vector_push(&v, &$1);
$$ = v;
}
;
parsecharacter : character '-' character { struct regexcharacter foo; foo.minc = $1; foo.maxc = $3; $$ = foo; }
| character { struct regexcharacter foo; foo.minc = $1; foo.maxc = $1; $$ = foo; }
;
%%
void yyerror(returnstruct * r, char* s) { fprintf(stderr, "%s\n", s); }
void printhelppage() {
printf(
"HELP PAGE:\n"
"\t-c <int> forces * and + to only go to int specified. Default is 255.\n"
"\t-d --debug shows how the regex is parsed\n"
"\t-h --help shows this page\n"
);
}
int main(int argc, char * argv[]) {
int validtoprint[argc];
int atleastonearg = 0;
int debug = 0;
int help = 0;
int parsemaxcharactercount = 0;
maxcharactercount = 255;
for (int i = 1; i < argc; i++) {
validtoprint[i] = 0;
if (parsemaxcharactercount) {
maxcharactercount = atoi(argv[i]);
parsemaxcharactercount = 0;
continue;
}
if (strcmp(argv[i], "-debug") == 0) {
debug = 1;
continue;
}
if (strcmp(argv[i], "--debug") == 0) {
debug = 1;
continue;
}
if (strcmp(argv[i], "-help") == 0) {
help = 1;
continue;
}
if (strcmp(argv[i], "--help") == 0) {
help = 1;
continue;
}
if (argv[i][0] == '-') {
char * itr = argv[i]+1;
if (*itr == '-') { itr++; }
while (*itr) {
if (*itr == 'd') {
debug = 1;
} else if (*itr == 'h') {
help = 1;
} else if (*itr == 'c') {
parsemaxcharactercount = 1;
} else {
fprintf(stderr, "Unknown character %c and argument %s\n",
*itr, argv[i]);
printhelppage();
return 1;
}
itr++;
}
continue;
}
atleastonearg = 1;
validtoprint[i] = 1;
}
if (atleastonearg) {
int fd[2];
if (pipe(fd) != 0) {
fprintf(stderr, "Failed to pipe\n");
return 2;
}
dup2(fd[0], 0);
for (int i = 1; i < argc; i++) {
if (!validtoprint[i]) {
continue;
}
dprintf(fd[1], "%s", argv[i]);
}
close(fd[1]);
}
if (help) {
printhelppage();
return 0;
}
returnstruct c;
int r = yyparse(&c);
if (r == 0) {
regexexpression_reset(&c);
if (debug) {
regexexpression_debug(&c);
}
regexexpression_print(&c);
while (!regexexpression_inc(&c)) {
regexexpression_print(&c);
}
}
return r;
}