static int run_grammar(VALUE self, char *filename, VALUE rb_input, char *input, bool run_callbacks) {
reset_terminal_error();
struct bc_read_stream *s = bc_rs_open_file(filename);
if (!s)
return 1; // should raise an invalid file format error in ruby instead
struct gzl_grammar *g = gzl_load_grammar(s);
bc_rs_close_stream(s);
ParseState *state = gzl_alloc_parse_state();
mk_user_data(state, self, input, rb_input);
BoundGrammar bg = {
.grammar = g,
.error_char_cb = error_char_callback,
.error_terminal_cb = error_terminal_callback
};
if (run_callbacks) {
bg.end_rule_cb = end_rule_callback;
bg.terminal_cb = terminal_callback;
}
rb_gzl_parse(input, state, &bg);
return 0;
}
int main(int argc, char *argv[])
{
if(argc > 1 && strcmp(argv[1], "--help") == 0)
{
usage();
exit(0);
}
if(argc < 3)
{
fprintf(stderr, "Not enough arguments.\n");
usage();
return 1;
}
int arg_offset = 1;
bool dump_json = false;
bool dump_total = false;
while(arg_offset < argc && argv[arg_offset][0] == '-')
{
if(strcmp(argv[arg_offset], "--dump-json") == 0)
dump_json = true;
else if(strcmp(argv[arg_offset], "--dump-total") == 0)
dump_total = true;
else
{
fprintf(stderr, "Unrecognized option '%s'.\n", argv[arg_offset]);
usage();
exit(1);
}
arg_offset++;
}
/* Load the grammar file. */
if(arg_offset+1 >= argc)
{
fprintf(stderr, "Must specify grammar file and input file.\n");
usage();
return 1;
}
struct bc_read_stream *s = bc_rs_open_file(argv[arg_offset++]);
if(!s)
{
printf("Couldn't open bitcode file '%s'!\n\n", argv[1]);
usage();
return 1;
}
struct gzl_grammar *g = gzl_load_grammar(s);
bc_rs_close_stream(s);
/* Open the input file. */
FILE *file;
if(strcmp(argv[arg_offset], "-") == 0)
{
file = stdin;
}
else
{
file = fopen(argv[arg_offset], "r");
if(!file)
{
printf("Couldn't open file '%s' for reading: %s\n\n", argv[2], strerror(errno));
usage();
return 1;
}
}
struct gzlparse_state user_state;
INIT_DYNARRAY(user_state.first_child, 1, 16);
user_state.first_child[0] = true;
struct gzl_parse_state *state = gzl_alloc_parse_state();
struct gzl_bound_grammar bg = {
.grammar = g,
.error_char_cb = error_char_callback,
.error_terminal_cb = error_terminal_callback,
};
if(dump_json) {
bg.terminal_cb = terminal_callback;
bg.did_start_rule_cb = start_rule_callback;
bg.will_end_rule_cb = end_rule_callback;
fputs("{\"parse_tree\":", stdout);
}
gzl_init_parse_state(state, &bg);
enum gzl_status status = gzl_parse_file(state, file, &user_state, 50 * 1024);
switch(status)
{
case GZL_STATUS_OK:
case GZL_STATUS_HARD_EOF:
{
if(dump_json)
fputs("\n}\n", stdout);
if(dump_total)
{
fprintf(stderr, "gzlparse: %zu bytes parsed", state->offset.byte);
if(status == GZL_STATUS_HARD_EOF)
fprintf(stderr, "(hit grammar EOF before file EOF)");
fprintf(stderr, ".\n");
}
break;
}
case GZL_STATUS_ERROR:
fprintf(stderr, "gzlparse: parse error, aborting.\n");
case GZL_STATUS_CANCELLED:
/* TODO: when we support length caps. */
break;
case GZL_STATUS_RESOURCE_LIMIT_EXCEEDED:
/* TODO: more informative message about what limit was exceeded. */
fprintf(stderr, "gzlparse: resource limit exceeded.\n");
break;
case GZL_STATUS_IO_ERROR:
perror("gzlparse");
break;
case GZL_STATUS_PREMATURE_EOF_ERROR:
fprintf(stderr, "gzlparse: premature eof.\n");
break;
}
gzl_free_parse_state(state);
gzl_free_grammar(g);
FREE_DYNARRAY(user_state.first_child);
fclose(file);
}