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/*
* bpeg.c - Source code for the bpeg parser
*
* See `man ./bpeg.1` for more details
*/
#include <fcntl.h>
#include <glob.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "compiler.h"
#include "file_loader.h"
#include "grammar.h"
#include "utils.h"
#include "vm.h"
static const char *usage = (
"BPEG - a Parsing Expression Grammar command line tool\n\n"
"Usage:\n"
" bpeg [flags] <pattern> [<input files>...]\n\n"
"Flags:\n"
" -h --help print the usage and quit\n"
" -v --verbose print verbose debugging info\n"
" -i --ignore-case preform matching case-insensitively\n"
" -d --define <name>=<def> define a grammar rule\n"
" -D --define-string <name>=<def> define a grammar rule (string-pattern)\n"
" -p --pattern <pat> provide a pattern (equivalent to bpeg '\\(<pat>)')\n"
" -P --pattern-string <pat> provide a string pattern (may be useful if '<pat>' begins with a '-')\n"
" -r --replace <replacement> replace the input pattern with the given replacement\n"
" -m --mode <mode> set the behavior mode (defult: find-all)\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);
check(argv[*i], "Attempt to get flag from NULL argument");
if (strncmp(argv[*i], flag, n) == 0) {
if (argv[*i][n] == '=') {
return &argv[*i][n+1];
} else if (argv[*i][n] == '\0') {
check(argv[*i+1], "Expected argument after '%s'\n\n%s", flag, usage);
++(*i);
return argv[*i];
}
}
return NULL;
}
static int run_match(grammar_t *g, const char *filename, vm_op_t *pattern, unsigned int flags)
{
file_t *f = load_file(filename);
check(f, "Could not open file: %s", filename);
match_t *m = match(g, f, f->contents, pattern, flags);
if (m != NULL && m->end > m->start + 1) {
print_match(f, m);
destroy_file(&f);
return 0;
} else {
destroy_file(&f);
return 1;
}
}
#define FLAG(f) (flag=getflag((f), argv, &i))
int main(int argc, char *argv[])
{
unsigned int flags = 0;
char *flag = NULL;
char path[PATH_MAX] = {0};
const char *rule = "find-all";
grammar_t *g = new_grammar();
// Load builtins:
if (access("/etc/xdg/bpeg/builtins.bpeg", R_OK) != -1)
load_grammar(g, load_file("/etc/xdg/bpeg/builtins.bpeg")); // Keep in memory for debugging output
sprintf(path, "%s/.config/bpeg/builtins.bpeg", getenv("HOME"));
if (access(path, R_OK) != -1)
load_grammar(g, load_file(path)); // Keep in memory for debugging output
int i, npatterns = 0;
check(argc > 1, "%s", usage);
for (i = 1; i < argc; i++) {
if (streq(argv[i], "--")) {
++i;
break;
} else if (streq(argv[i], "--help") || streq(argv[i], "-h")) {
printf("%s\n", usage);
return 0;
} else if (streq(argv[i], "--verbose") || streq(argv[i], "-v")) {
flags |= BPEG_VERBOSE;
} else if (streq(argv[i], "--ignore-case") || streq(argv[i], "-i")) {
flags |= BPEG_IGNORECASE;
} else if (FLAG("--replace") || FLAG("-r")) {
vm_op_t *p = bpeg_replacement(bpeg_pattern(NULL, "pattern"), flag);
check(p, "Replacement failed to compile");
add_def(g, NULL, flag, "replacement", p);
rule = "replace-all";
} else if (FLAG("--grammar") || FLAG("-g")) {
file_t *f = load_file(flag);
if (f == NULL) {
sprintf(path, "%s/.config/bpeg/%s.bpeg", getenv("HOME"), flag);
f = load_file(path);
}
if (f == NULL) {
sprintf(path, "/etc/xdg/bpeg/%s.bpeg", flag);
f = load_file(path);
}
check(f != NULL, "Couldn't find grammar: %s", flag);
load_grammar(g, f); // Keep in memory for debug output
} else if (FLAG("--define") || FLAG("-d")) {
char *def = flag;
char *eq = strchr(def, '=');
check(eq, "Rule definitions must include an '='\n\n%s", usage);
*eq = '\0';
char *src = ++eq;
vm_op_t *pat = bpeg_pattern(NULL, src);
check(pat, "Failed to compile pattern");
add_def(g, NULL, src, def, pat);
} else if (FLAG("--define-string") || FLAG("-D")) {
char *def = flag;
char *eq = strchr(def, '=');
check(eq, "Rule definitions must include an '='\n\n%s", usage);
*eq = '\0';
char *src = ++eq;
vm_op_t *pat = bpeg_stringpattern(NULL, src);
check(pat, "Failed to compile pattern");
add_def(g, NULL, src, def, pat);
} else if (FLAG("--pattern") || FLAG("-p")) {
check(npatterns == 0, "Cannot define multiple patterns");
vm_op_t *p = bpeg_pattern(NULL, flag);
check(p, "Pattern failed to compile: '%s'", flag);
add_def(g, NULL, flag, "pattern", p);
++npatterns;
} else if (FLAG("--pattern-string") || FLAG("-P")) {
vm_op_t *p = bpeg_stringpattern(NULL, flag);
check(p, "Pattern failed to compile");
add_def(g, NULL, flag, "pattern", p);
++npatterns;
} else if (FLAG("--mode") || FLAG("-m")) {
rule = flag;
} else if (argv[i][0] != '-') {
if (npatterns > 0) break;
vm_op_t *p = bpeg_stringpattern(NULL, argv[i]);
check(p, "Pattern failed to compile");
add_def(g, NULL, argv[i], "pattern", p);
++npatterns;
} else {
printf("Unrecognized flag: %s\n\n%s\n", argv[i], usage);
return 1;
}
}
if (isatty(STDOUT_FILENO)) {
vm_op_t *p = bpeg_pattern(NULL, "(/)");
check(p, "Failed to compile is-tty");
add_def(g, NULL, "(/)", "is-tty", p);
}
vm_op_t *pattern = lookup(g, rule);
check(pattern != NULL, "No such rule: '%s'", rule);
int ret = 1;
if (i < argc) {
// Files pass in as command line args:
for (int nfiles = 0; i < argc; nfiles++, i++) {
ret &= run_match(g, argv[i], pattern, flags);
}
} else if (isatty(STDIN_FILENO)) {
// No files, no piped in input, so use * **/*:
glob_t globbuf;
glob("*", 0, NULL, &globbuf);
glob("**/*", GLOB_APPEND, NULL, &globbuf);
for (size_t i = 0; i < globbuf.gl_pathc; i++) {
ret &= run_match(g, globbuf.gl_pathv[i], pattern, flags);
}
globfree(&globbuf);
} else {
// Piped in input:
ret &= run_match(g, NULL, pattern, flags);
}
return ret;
}
// vim: ts=4 sw=0 et cino=L2,l1,(0,W4,m1
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