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/*
* bpeg.c - Source code for the bpeg parser
*
* Grammar:
* # <comment> comment
* . any character (multiline: $.)
* ^ beginning of a line (^^: beginning of file)
* $ end of a line ($$: end of file)
* _ 0 or more spaces or tabs (__: include newlines and comments)
* `<c> character <c>
* `<a>-<z> character between <a> and <z>
* \<e> escape sequence (e.g. \n, \033)
* \<e1>-<e2> escape sequence range (e.g. \x00-\xF0)
* ! <pat> no <pat>
* ~ <pat> any character as long as it doesn't match <pat> (multiline: ~~<pat>)
* & <pat> upto and including <pat> (aka *~<pat> <pat>) (multiline: &&<pat>)
* <N=1> + <pat> [% <sep="">] <N> or more <pat>s (separated by <sep>)
* * <pat> [% <sep="">] sugar for "0+ <pat> [% <sep>]"
* <N=1> - <pat> [% <sep="">] <N> or fewer <pat>s (separated by <sep>)
* ? <pat> sugar for "1- <pat>"
* <N> - <M> <pat> <N> to <M> (inclusive) <pat>s
* < <pat> after <pat>, ...
* > <pat> before <pat>, ...
* ( <pat> ) <pat>
* @ <pat> capture <pat>
* @ [ <name> ] <pat> <pat> named <name>
* { <pat> => <str> } <pat> replaced with <str>
* "@1" or "@[1]" first capture
* "@foo" or "@[foo]" capture named "foo"
* <pat1> <pat2> <pat1> followed by <pat2>
* <pat> / <alt> <pat> otherwise <alt>
* ; <name> = <pat> <name> is defined to be <pat>
*/
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "compiler.h"
#include "grammar.h"
#include "utils.h"
#include "vm.h"
static const char *usage = (
"Usage:\n"
" bpeg [flags] <pattern> [<input files>...]\n\n"
"Flags:\n"
" -h --help\t print the usage and quit\n"
" -v --verbose\t print verbose debugging info\n"
" -d --define <name>=<def> Define a grammar rule\n"
" -r --replace <replacement> replace the input pattern with the given replacement\n"
" -g --grammar <grammar file> use the specified file as a grammar\n");
static char *getflag(const char *flag, char *argv[], int *i)
{
size_t n = strlen(flag);
if (strncmp(argv[*i], flag, n) == 0) {
if (argv[*i][n] == '=') {
return &argv[*i][n+1];
} else if (argv[*i][n] == '\0') {
++(*i);
return argv[*i];
}
}
return NULL;
}
#define FLAG(f) (flag=getflag((f), argv, &i))
int main(int argc, char *argv[])
{
int verbose = 0;
char *flag = NULL;
const char *rule = "find-all";
grammar_t *g = new_grammar();
int fd;
if ((fd=open("/etc/xdg/bpeg/builtins.bpeg", O_RDONLY)) >= 0)
load_grammar(g, readfile(fd));
char path[PATH_MAX] = {0};
sprintf(path, "%s/.config/bpeg/builtins.bpeg", getenv("HOME"));
if ((fd=open(path, O_RDONLY)) >= 0)
load_grammar(g, readfile(fd));
int i, npatterns = 0;
for (i = 1; i < argc; i++) {
if (streq(argv[i], "--")) {
++i;
break;
} else if (FLAG("--help") || FLAG("-h")) {
printf("%s\n", usage);
return 0;
} else if (FLAG("--verbose") || FLAG("-v")) {
verbose = 1;
} else if (FLAG("--pattern") || FLAG("-p")) {
rule = flag;
} else if (FLAG("--replace") || FLAG("-r")) {
vm_op_t *p = bpeg_replacement(bpeg_pattern("pattern"), flag);
check(p, "Replacement failed to compile");
add_def(g, flag, "replacement", p);
rule = "replace-all";
} else if (FLAG("--grammar") || FLAG("-g")) {
int fd;
if (streq(flag, "-")) {
fd = STDIN_FILENO;
} else {
fd = open(flag, O_RDONLY);
if (fd < 0) {
sprintf(path, "%s/.config/bpeg/%s.bpeg", getenv("HOME"), flag);
fd = open(path, O_RDONLY);
}
if (fd < 0) {
sprintf(path, "/etc/xdg/bpeg/%s.bpeg", flag);
fd = open(path, O_RDONLY);
}
check(fd >= 0, "Couldn't find grammar: %s", flag);
}
load_grammar(g, readfile(fd));
} else if (FLAG("--define") || FLAG("-d")) {
char *def = flag;
char *eq = strchr(def, '=');
check(eq, usage);
*eq = '\0';
char *src = ++eq;
vm_op_t *pat = bpeg_pattern(src);
check(pat, "Failed to compile pattern");
add_def(g, src, def, pat);
} else if (FLAG("--escaped") || FLAG("-e")) {
check(npatterns == 0, "Cannot define multiple patterns");
vm_op_t *p = bpeg_pattern(argv[i]);
check(p, "Pattern failed to compile");
add_def(g, argv[i], "pattern", p);
++npatterns;
} else if (argv[i][0] != '-') {
if (npatterns > 0) break;
vm_op_t *p = bpeg_stringpattern(argv[i]);
check(p, "Pattern failed to compile");
add_def(g, argv[i], "pattern", p);
++npatterns;
}
}
vm_op_t *pattern = lookup(g, rule);
check(pattern != NULL, "No such rule: '%s'", rule);
if (verbose) {
print_pattern(pattern);
}
char *input;
if (i == argc) {
// Force stdin if no files given
input = readfile(STDIN_FILENO);
goto run_match;
}
for (int nfiles = 0; i < argc; nfiles++, i++) {
if (argv[i] == NULL || streq(argv[i], "-")) {
input = readfile(STDIN_FILENO);
} else {
int fd = open(argv[i], O_RDONLY);
check(fd >= 0, "Couldn't open file: %s", argv[i]);
input = readfile(fd);
if (nfiles > 0) printf("\n");
printf("\033[1;4;33m%s\033[0m\n", argv[i]);
}
run_match:;
// Ensure string has a null byte to the left:
char *lpadded = calloc(sizeof(char), strlen(input)+2);
stpcpy(&lpadded[1], input);
input = &lpadded[1];
match_t *m = match(g, input, pattern);
if (m == NULL) {
printf("No match\n");
return 1;
} else {
print_match(m, "\033[0m", verbose);
//printf("\033[0;2m%s\n", m->end);
}
}
return 0;
}
// vim: ts=4 sw=0 et cino=L2,l1,(0,W4,m1
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