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/* Parser-tokenizer link implementation */
#include "pgenheaders.h"
#include "tokenizer.h"
#include "node.h"
#include "grammar.h"
#include "parser.h"
#include "parsetok.h"
#include "errcode.h"
/* Forward */
static int parsetok PROTO((struct tok_state *, grammar *, int, node **));
/* Parse input coming from a string. Return error code, print some errors. */
int
parsestring(s, g, start, n_ret)
char *s;
grammar *g;
int start;
node **n_ret;
{
struct tok_state *tok = tok_setups(s);
int ret;
if (tok == NULL) {
fprintf(stderr, "no mem for tok_setups\n");
return E_NOMEM;
}
ret = parsetok(tok, g, start, n_ret);
if (ret == E_TOKEN || ret == E_SYNTAX) {
fprintf(stderr, "String parsing error at line %d\n",
tok->lineno);
}
tok_free(tok);
return ret;
}
/* Parse input coming from a file. Return error code, print some errors. */
int
parsefile(fp, filename, g, start, ps1, ps2, n_ret)
FILE *fp;
char *filename;
grammar *g;
int start;
char *ps1, *ps2;
node **n_ret;
{
struct tok_state *tok = tok_setupf(fp, ps1, ps2);
int ret;
if (tok == NULL) {
fprintf(stderr, "no mem for tok_setupf\n");
return E_NOMEM;
}
ret = parsetok(tok, g, start, n_ret);
if (ret == E_TOKEN || ret == E_SYNTAX) {
char *p;
fprintf(stderr, "Parsing error: file %s, line %d:\n",
filename, tok->lineno);
*tok->inp = '\0';
if (tok->inp > tok->buf && tok->inp[-1] == '\n')
tok->inp[-1] = '\0';
fprintf(stderr, "%s\n", tok->buf);
for (p = tok->buf; p < tok->cur; p++) {
if (*p == '\t')
putc('\t', stderr);
else
putc(' ', stderr);
}
fprintf(stderr, "^\n");
}
tok_free(tok);
return ret;
}
/* Parse input coming from the given tokenizer structure.
Return error code. */
static int
parsetok(tok, g, start, n_ret)
struct tok_state *tok;
grammar *g;
int start;
node **n_ret;
{
parser_state *ps;
int ret;
if ((ps = newparser(g, start)) == NULL) {
fprintf(stderr, "no mem for new parser\n");
return E_NOMEM;
}
for (;;) {
char *a, *b;
int type;
int len;
char *str;
type = tok_get(tok, &a, &b);
if (type == ERRORTOKEN) {
ret = tok->done;
break;
}
len = b - a;
str = NEW(char, len + 1);
if (str == NULL) {
fprintf(stderr, "no mem for next token\n");
ret = E_NOMEM;
break;
}
strncpy(str, a, len);
str[len] = '\0';
ret = addtoken(ps, (int)type, str, tok->lineno);
if (ret != E_OK) {
if (ret == E_DONE) {
*n_ret = ps->p_tree;
ps->p_tree = NULL;
}
else if (tok->lineno <= 1 && tok->done == E_EOF)
ret = E_EOF;
break;
}
}
delparser(ps);
return ret;
}
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