cpython/Parser/parsetok.c at pythoncapi · pythoncapi/cpython · GitHub

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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"

/* Forward */

static node *parsetok(struct tok_state *, grammar *, int, perrdetail *, int *);

static int initerr(perrdetail *err_ret, PyObject * 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)

{

int iflags = flags;

return PyParser_ParseStringFlagsFilenameEx(s, filename, g, start,

err_ret, &iflags);

}

node *

PyParser_ParseStringObject(const char *s, PyObject *filename,

grammar *g, int start,

perrdetail *err_ret, int *flags)

{

struct tok_state *tok;

int exec_input = start == file_input;

if (initerr(err_ret, filename) < 0)

return NULL;

if (*flags & PyPARSE_IGNORE_COOKIE)

tok = PyTokenizer_FromUTF8(s, exec_input);

else

tok = PyTokenizer_FromString(s, exec_input);

if (tok == NULL) {

err_ret->error = PyErr_Occurred() ? E_DECODE : E_NOMEM;

return NULL;

}

#ifndef PGEN

Py_INCREF(err_ret->filename);

tok->filename = err_ret->filename;

#endif

return parsetok(tok, g, start, err_ret, flags);

}

node *

PyParser_ParseStringFlagsFilenameEx(const char *s, const char *filename_str,

grammar *g, int start,

perrdetail *err_ret, int *flags)

{

node *n;

PyObject *filename = NULL;

#ifndef PGEN

if (filename_str != NULL) {

filename = PyUnicode_DecodeFSDefault(filename_str);

if (filename == NULL) {

err_ret->error = E_ERROR;

return NULL;

}

#endif

n = PyParser_ParseStringObject(s, filename, g, start, err_ret, flags);

#ifndef PGEN

Py_XDECREF(filename);

#endif

return n;

}

/* Parse input coming from a file. Return error code, print some errors. */

node *

PyParser_ParseFile(FILE *fp, const char *filename, grammar *g, int start,

const char *ps1, const char *ps2,

perrdetail *err_ret)

{

return PyParser_ParseFileFlags(fp, filename, NULL,

g, start, ps1, ps2, err_ret, 0);

}

node *

PyParser_ParseFileFlags(FILE *fp, const char *filename, const char *enc,

grammar *g, int start,

const char *ps1, const char *ps2,

perrdetail *err_ret, int flags)

{

int iflags = flags;

return PyParser_ParseFileFlagsEx(fp, filename, enc, g, start, ps1,

ps2, err_ret, &iflags);

}

node *

PyParser_ParseFileObject(FILE *fp, PyObject *filename,

const char *enc, grammar *g, int start,

const char *ps1, const char *ps2,

perrdetail *err_ret, int *flags)

{

struct tok_state *tok;

if (initerr(err_ret, filename) < 0)

return NULL;

if ((tok = PyTokenizer_FromFile(fp, enc, ps1, ps2)) == NULL) {

err_ret->error = E_NOMEM;

return NULL;

}

#ifndef PGEN

Py_INCREF(err_ret->filename);

tok->filename = err_ret->filename;

#endif

return parsetok(tok, g, start, err_ret, flags);

}

node *

PyParser_ParseFileFlagsEx(FILE *fp, const char *filename,

const char *enc, grammar *g, int start,

const char *ps1, const char *ps2,

perrdetail *err_ret, int *flags)

{

node *n;

PyObject *fileobj = NULL;

#ifndef PGEN

if (filename != NULL) {

fileobj = PyUnicode_DecodeFSDefault(filename);

if (fileobj == NULL) {

err_ret->error = E_ERROR;

return NULL;

}

#endif

n = PyParser_ParseFileObject(fp, fileobj, enc, g,

start, ps1, ps2, err_ret, flags);

#ifndef PGEN

Py_XDECREF(fileobj);

#endif

return n;

}

#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD

#if 0

static const char with_msg[] =

"%s:%d: Warning: 'with' will become a reserved keyword in Python 2.6\n";

static const char as_msg[] =

"%s:%d: Warning: 'as' will become a reserved keyword in Python 2.6\n";

static void

warn(const char *msg, const char *filename, int lineno)

{

if (filename == NULL)

filename = "<string>";

PySys_WriteStderr(msg, filename, lineno);

}

#endif

/* Parse input coming from the given tokenizer structure.

Return error code. */

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 = (a != NULL && b != NULL) ? b - a : 0;

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->expected = NOTEQUAL;

err_ret->error = E_SYNTAX;

break;

}

#endif

if (a != NULL && a >= tok->line_start) {

col_offset = Py_SAFE_DOWNCAST(a - tok->line_start,

intptr_t, int);

}

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 int

initerr(perrdetail *err_ret, PyObject *filename)

{

err_ret->error = E_OK;

err_ret->lineno = 0;

err_ret->offset = 0;

err_ret->text = NULL;

err_ret->token = -1;

err_ret->expected = -1;

#ifndef PGEN

if (filename) {

Py_INCREF(filename);

err_ret->filename = filename;

}

else {

err_ret->filename = PyUnicode_FromString("<string>");

if (err_ret->filename == NULL) {

err_ret->error = E_ERROR;

return -1;

}

#endif

return 0;

}

cpython/Parser/parsetok.c at pythoncapi · pythoncapi/cpython · GitHub

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