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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"
#include "graminit.h"
int Py_TabcheckFlag;
/* Forward */
static node *parsetok(struct tok_state *, grammar *, int, perrdetail *, int);
static void initerr(perrdetail *err_ret, const char* filename);
/* Parse input coming from a string. Return error code, print some errors. */
node *
PyParser_ParseString(const char *s, grammar *g, int start, perrdetail *err_ret)
{
return PyParser_ParseStringFlagsFilename(s, NULL, g, start, err_ret, 0);
}
node *
PyParser_ParseStringFlags(const char *s, grammar *g, int start,
perrdetail *err_ret, int flags)
{
return PyParser_ParseStringFlagsFilename(s, NULL,
g, start, err_ret, flags);
}
node *
PyParser_ParseStringFlagsFilename(const char *s, const char *filename,
grammar *g, int start,
perrdetail *err_ret, int flags)
{
struct tok_state *tok;
initerr(err_ret, filename);
if ((tok = PyTokenizer_FromString(s)) == NULL) {
err_ret->error = PyErr_Occurred() ? E_DECODE : E_NOMEM;
return NULL;
}
tok->filename = filename ? filename : "<string>";
if (Py_TabcheckFlag || Py_VerboseFlag) {
tok->altwarning = (tok->filename != NULL);
if (Py_TabcheckFlag >= 2)
tok->alterror++;
}
return parsetok(tok, g, start, err_ret, flags);
}
/* Parse input coming from a file. Return error code, print some errors. */
node *
PyParser_ParseFile(FILE *fp, const char *filename, grammar *g, int start,
char *ps1, char *ps2, perrdetail *err_ret)
{
return PyParser_ParseFileFlags(fp, filename, g, start, ps1, ps2,
err_ret, 0);
}
node *
PyParser_ParseFileFlags(FILE *fp, const char *filename, grammar *g, int start,
char *ps1, char *ps2, perrdetail *err_ret, int flags)
{
struct tok_state *tok;
initerr(err_ret, filename);
if ((tok = PyTokenizer_FromFile(fp, ps1, ps2)) == NULL) {
err_ret->error = E_NOMEM;
return NULL;
}
tok->filename = filename;
if (Py_TabcheckFlag || Py_VerboseFlag) {
tok->altwarning = (filename != NULL);
if (Py_TabcheckFlag >= 2)
tok->alterror++;
}
return parsetok(tok, g, start, err_ret, flags);
}
/* Parse input coming from the given tokenizer structure.
Return error code. */
#if 0 /* future keyword */
static char yield_msg[] =
"%s:%d: Warning: 'yield' will become a reserved keyword in the future\n";
#endif
static node *
parsetok(struct tok_state *tok, grammar *g, int start, perrdetail *err_ret,
int flags)
{
parser_state *ps;
node *n;
int started = 0;
if ((ps = PyParser_New(g, start)) == NULL) {
fprintf(stderr, "no mem for new parser\n");
err_ret->error = E_NOMEM;
PyTokenizer_Free(tok);
return NULL;
}
#if 0 /* future keyword */
if (flags & PyPARSE_YIELD_IS_KEYWORD)
ps->p_generators = 1;
#endif
for (;;) {
char *a, *b;
int type;
size_t len;
char *str;
type = PyTokenizer_Get(tok, &a, &b);
if (type == ERRORTOKEN) {
err_ret->error = tok->done;
break;
}
if (type == ENDMARKER && started) {
type = NEWLINE; /* Add an extra newline */
started = 0;
/* Add the right number of dedent tokens,
except if a certain flag is given --
codeop.py uses this. */
if (tok->indent &&
!(flags & PyPARSE_DONT_IMPLY_DEDENT))
{
tok->pendin = -tok->indent;
tok->indent = 0;
}
}
else
started = 1;
len = b - a; /* XXX this may compute NULL - NULL */
str = (char *) PyObject_MALLOC(len + 1);
if (str == NULL) {
fprintf(stderr, "no mem for next token\n");
err_ret->error = E_NOMEM;
break;
}
if (len > 0)
strncpy(str, a, len);
str[len] = '\0';
#if 0 /* future keyword */
/* Warn about yield as NAME */
if (type == NAME && !ps->p_generators &&
len == 5 && str[0] == 'y' && strcmp(str, "yield") == 0)
PySys_WriteStderr(yield_msg,
err_ret->filename==NULL ?
"<string>" : err_ret->filename,
tok->lineno);
#endif
if ((err_ret->error =
PyParser_AddToken(ps, (int)type, str, tok->lineno,
&(err_ret->expected))) != E_OK) {
if (err_ret->error != E_DONE)
PyObject_FREE(str);
break;
}
}
if (err_ret->error == E_DONE) {
n = ps->p_tree;
ps->p_tree = NULL;
}
else
n = NULL;
PyParser_Delete(ps);
if (n == NULL) {
if (tok->lineno <= 1 && tok->done == E_EOF)
err_ret->error = E_EOF;
err_ret->lineno = tok->lineno;
if (tok->buf != NULL) {
assert(tok->cur - tok->buf < INT_MAX);
err_ret->offset = (int)(tok->cur - tok->buf);
size_t len = tok->inp - tok->buf;
err_ret->text = (char *) PyObject_MALLOC(len + 1);
if (err_ret->text != NULL) {
if (len > 0)
strncpy(err_ret->text, tok->buf, len);
err_ret->text[len] = '\0';
}
}
} else if (tok->encoding != NULL) {
node* r = PyNode_New(encoding_decl);
r->n_str = tok->encoding;
r->n_nchildren = 1;
r->n_child = n;
tok->encoding = NULL;
n = r;
}
PyTokenizer_Free(tok);
return n;
}
static void
initerr(perrdetail *err_ret, const char *filename)
{
err_ret->error = E_OK;
err_ret->filename = filename;
err_ret->lineno = 0;
err_ret->offset = 0;
err_ret->text = NULL;
err_ret->token = -1;
err_ret->expected = -1;
}
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