parser_state *
PyParser_New(grammar *g, int start)
{
parser_state *ps;
DBP("Attempting to create new PyParser\n");
if (!g->g_accel)
PyGrammar_AddAccelerators(g);
DBP("Added grammar accelerators\n");
ps = (parser_state *)PyMem_MALLOC(sizeof(parser_state));
DBP("Created parser state\n");
if (ps == NULL)
return NULL;
ps->p_grammar = g;
#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
ps->p_flags = 0;
#endif
ps->p_tree = PyNode_New(start);
if (ps->p_tree == NULL) {
PyMem_FREE(ps);
return NULL;
}
s_reset(&ps->p_stack);
(void) s_push(&ps->p_stack, PyGrammar_FindDFA(g, start), ps->p_tree);
DBP("Created PyParser!!\n");
return ps;
}
parser_state *
PyParser_New(grammar *g, int start)
{
parser_state *ps;
if (!g->g_accel)
PyGrammar_AddAccelerators(g);
ps = PyMem_NEW(parser_state, 1);
if (ps == NULL)
return NULL;
ps->p_grammar = g;
ps->p_generators = 0;
ps->p_tree = PyNode_New(start);
if (ps->p_tree == NULL) {
PyMem_DEL(ps);
return NULL;
}
s_reset(&ps->p_stack);
(void) s_push(&ps->p_stack, PyGrammar_FindDFA(g, start), ps->p_tree);
return ps;
}
static node *
parsetok(struct tok_state *tok, grammar *g, int start, perrdetail *err_ret,
int *flags)
{
parser_state *ps;
node *n;
int started = 0, handling_import = 0, handling_with = 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;
}
#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
if (*flags & PyPARSE_PRINT_IS_FUNCTION) {
ps->p_flags |= CO_FUTURE_PRINT_FUNCTION;
}
if (*flags & PyPARSE_UNICODE_LITERALS) {
ps->p_flags |= CO_FUTURE_UNICODE_LITERALS;
}
#endif
for (;;) {
char *a, *b;
int type;
size_t len;
char *str;
int col_offset;
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 */
handling_with = handling_import = 0;
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';
#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
#endif
if (a >= tok->line_start)
col_offset = a - tok->line_start;
else
col_offset = -1;
if ((err_ret->error =
PyParser_AddToken(ps, (int)type, str, tok->lineno, col_offset,
&(err_ret->expected))) != E_OK) {
if (err_ret->error != E_DONE) {
PyObject_FREE(str);
err_ret->token = type;
}
break;
}
}
if (err_ret->error == E_DONE) {
n = ps->p_tree;
ps->p_tree = NULL;
}
else
n = NULL;
#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
*flags = ps->p_flags;
#endif
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) {
char *text = NULL;
size_t len;
assert(tok->cur - tok->buf < INT_MAX);
err_ret->offset = (int)(tok->cur - tok->buf);
len = tok->inp - tok->buf;
#ifdef Py_USING_UNICODE
text = PyTokenizer_RestoreEncoding(tok, len, &err_ret->offset);
#endif
if (text == NULL) {
text = (char *) PyObject_MALLOC(len + 1);
if (text != NULL) {
if (len > 0)
strncpy(text, tok->buf, len);
text[len] = '\0';
}
}
err_ret->text = text;
}
} else if (tok->encoding != NULL) {
node* r = PyNode_New(encoding_decl);
if (!r) {
err_ret->error = E_NOMEM;
n = NULL;
goto done;
}
r->n_str = tok->encoding;
r->n_nchildren = 1;
r->n_child = n;
tok->encoding = NULL;
n = r;
}
done:
PyTokenizer_Free(tok);
return n;
}
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) {
err_ret->error = E_NOMEM;
PyTokenizer_Free(tok);
return NULL;
}
#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
if (*flags & PyPARSE_BARRY_AS_BDFL)
ps->p_flags |= CO_FUTURE_BARRY_AS_BDFL;
#endif
for (;;) {
char *a, *b;
int type;
size_t len;
char *str;
int col_offset;
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) {
err_ret->error = E_NOMEM;
break;
}
if (len > 0)
strncpy(str, a, len);
str[len] = '\0';
#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
if (type == NOTEQUAL) {
if (!(ps->p_flags & CO_FUTURE_BARRY_AS_BDFL) &&
strcmp(str, "!=")) {
PyObject_FREE(str);
err_ret->error = E_SYNTAX;
break;
}
else if ((ps->p_flags & CO_FUTURE_BARRY_AS_BDFL) &&
strcmp(str, "<>")) {
PyObject_FREE(str);
err_ret->text = "with Barry as BDFL, use '<>' "
"instead of '!='";
err_ret->error = E_SYNTAX;
break;
}
}
#endif
if (a >= tok->line_start)
col_offset = a - tok->line_start;
else
col_offset = -1;
if ((err_ret->error =
PyParser_AddToken(ps, (int)type, str,
tok->lineno, col_offset,
&(err_ret->expected))) != E_OK) {
if (err_ret->error != E_DONE) {
PyObject_FREE(str);
err_ret->token = type;
}
break;
}
}
if (err_ret->error == E_DONE) {
n = ps->p_tree;
ps->p_tree = NULL;
#ifndef PGEN
/* Check that the source for a single input statement really
is a single statement by looking at what is left in the
buffer after parsing. Trailing whitespace and comments
are OK. */
if (start == single_input) {
char *cur = tok->cur;
char c = *tok->cur;
for (;;) {
while (c == ' ' || c == '\t' || c == '\n' || c == '\014')
c = *++cur;
if (!c)
break;
if (c != '#') {
err_ret->error = E_BADSINGLE;
PyNode_Free(n);
n = NULL;
break;
}
/* Suck up comment. */
while (c && c != '\n')
c = *++cur;
}
}
#endif
}
else
n = NULL;
#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
*flags = ps->p_flags;
#endif
PyParser_Delete(ps);
if (n == NULL) {
if (tok->done == E_EOF)
err_ret->error = E_EOF;
err_ret->lineno = tok->lineno;
if (tok->buf != NULL) {
size_t len;
assert(tok->cur - tok->buf < INT_MAX);
err_ret->offset = (int)(tok->cur - tok->buf);
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) {
/* 'nodes->n_str' uses PyObject_*, while 'tok->encoding' was
* allocated using PyMem_
*/
node* r = PyNode_New(encoding_decl);
if (r)
r->n_str = PyObject_MALLOC(strlen(tok->encoding)+1);
if (!r || !r->n_str) {
err_ret->error = E_NOMEM;
if (r)
PyObject_FREE(r);
n = NULL;
goto done;
}
strcpy(r->n_str, tok->encoding);
PyMem_FREE(tok->encoding);
tok->encoding = NULL;
r->n_nchildren = 1;
r->n_child = n;
n = r;
}
done:
PyTokenizer_Free(tok);
return n;
}
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;
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;
err_ret->offset = tok->cur - tok->buf;
if (tok->buf != NULL) {
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 node *
parsetok(struct tok_state *tok, grammar *g, int start, perrdetail *err_ret,
int flags)
{
parser_state *ps;
node *n;
int started = 0, handling_import = 0, handling_with = 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;
}
#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
if (flags & PyPARSE_WITH_IS_KEYWORD)
ps->p_flags |= CO_FUTURE_WITH_STATEMENT;
#endif
for (;;) {
char *a, *b;
int type;
size_t len;
char *str;
int col_offset;
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 */
handling_with = handling_import = 0;
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';
#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
/* This is only necessary to support the "as" warning, but
we don't want to warn about "as" in import statements. */
if (type == NAME &&
len == 6 && str[0] == 'i' && strcmp(str, "import") == 0)
handling_import = 1;
/* Warn about with as NAME */
if (type == NAME &&
!(ps->p_flags & CO_FUTURE_WITH_STATEMENT)) {
if (len == 4 && str[0] == 'w' && strcmp(str, "with") == 0)
warn(with_msg, err_ret->filename, tok->lineno);
else if (!(handling_import || handling_with) &&
len == 2 && str[0] == 'a' &&
strcmp(str, "as") == 0)
warn(as_msg, err_ret->filename, tok->lineno);
}
else if (type == NAME &&
(ps->p_flags & CO_FUTURE_WITH_STATEMENT) &&
len == 4 && str[0] == 'w' && strcmp(str, "with") == 0)
handling_with = 1;
#endif
if (a >= tok->line_start)
col_offset = a - tok->line_start;
else
col_offset = -1;
if ((err_ret->error =
PyParser_AddToken(ps, (int)type, str, tok->lineno, col_offset,
&(err_ret->expected))) != E_OK) {
if (err_ret->error != E_DONE) {
PyObject_FREE(str);
err_ret->token = type;
}
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) {
size_t len;
assert(tok->cur - tok->buf < INT_MAX);
err_ret->offset = (int)(tok->cur - tok->buf);
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);
if (!r) {
err_ret->error = E_NOMEM;
n = NULL;
goto done;
}
r->n_str = tok->encoding;
r->n_nchildren = 1;
r->n_child = n;
tok->encoding = NULL;
n = r;
}
done:
PyTokenizer_Free(tok);
return n;
}