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4469d0ca56
svn+ssh://pythondev@svn.python.org/python/trunk ........ r67348 | benjamin.peterson | 2008-11-22 20:09:41 -0600 (Sat, 22 Nov 2008) | 1 line raise a better error ........ r67355 | georg.brandl | 2008-11-23 13:17:25 -0600 (Sun, 23 Nov 2008) | 2 lines #4392: fix parameter name. ........ r67359 | georg.brandl | 2008-11-23 15:57:30 -0600 (Sun, 23 Nov 2008) | 2 lines #4399: fix typo. ........ r67362 | gregory.p.smith | 2008-11-23 18:41:43 -0600 (Sun, 23 Nov 2008) | 2 lines Document PY_SSIZE_T_CLEAN for PyArg_ParseTuple. ........ r67364 | benjamin.peterson | 2008-11-23 19:16:29 -0600 (Sun, 23 Nov 2008) | 2 lines replace reference to debugger-hooks ........ r67365 | benjamin.peterson | 2008-11-23 22:09:03 -0600 (Sun, 23 Nov 2008) | 1 line #4396 make the parser module correctly validate the with syntax ........ r67367 | georg.brandl | 2008-11-24 10:16:07 -0600 (Mon, 24 Nov 2008) | 2 lines Fix typo. ........ r67368 | georg.brandl | 2008-11-24 13:56:47 -0600 (Mon, 24 Nov 2008) | 2 lines #4404: make clear what "path" is. ........ r67398 | benjamin.peterson | 2008-11-26 11:39:17 -0600 (Wed, 26 Nov 2008) | 1 line fix typo in sqlite3 docs ........ r67423 | jesse.noller | 2008-11-28 12:59:35 -0600 (Fri, 28 Nov 2008) | 2 lines issue4238: bsd support for cpu_count ........ r67424 | christian.heimes | 2008-11-28 13:33:33 -0600 (Fri, 28 Nov 2008) | 1 line Retain copyright of processing examples. This was requested by a Debian maintainer during packaging of the multiprocessing package for 2.4/2.5 ........ r67432 | benjamin.peterson | 2008-11-28 17:18:46 -0600 (Fri, 28 Nov 2008) | 1 line SVN format 9 is the same it seems ........ r67440 | jeremy.hylton | 2008-11-28 17:42:59 -0600 (Fri, 28 Nov 2008) | 4 lines Move definition int sval into branch of ifdef where it is used. Otherwise, you get a warning about an undefined variable. ........ r67441 | jeremy.hylton | 2008-11-28 18:09:16 -0600 (Fri, 28 Nov 2008) | 2 lines Reflow long lines. ........ r67444 | amaury.forgeotdarc | 2008-11-28 20:03:32 -0600 (Fri, 28 Nov 2008) | 2 lines Fix a small typo in docstring ........ r67445 | benjamin.peterson | 2008-11-29 21:07:33 -0600 (Sat, 29 Nov 2008) | 1 line StringIO.close() stops you from using the buffer, too ........ r67454 | benjamin.peterson | 2008-11-30 08:43:23 -0600 (Sun, 30 Nov 2008) | 1 line note the version that works ........ r67455 | martin.v.loewis | 2008-11-30 13:28:27 -0600 (Sun, 30 Nov 2008) | 1 line Issue #4365: Add crtassem.h constants to the msvcrt module. ........ r67457 | christian.heimes | 2008-11-30 15:16:28 -0600 (Sun, 30 Nov 2008) | 1 line w# requires Py_ssize_t ........ r67458 | benjamin.peterson | 2008-11-30 15:46:16 -0600 (Sun, 30 Nov 2008) | 1 line fix pyspecific extensions that were broken by Sphinx's grand renaming ........
3184 lines
92 KiB
C
3184 lines
92 KiB
C
/* parsermodule.c
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*
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* Copyright 1995-1996 by Fred L. Drake, Jr. and Virginia Polytechnic
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* Institute and State University, Blacksburg, Virginia, USA.
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* Portions copyright 1991-1995 by Stichting Mathematisch Centrum,
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* Amsterdam, The Netherlands. Copying is permitted under the terms
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* associated with the main Python distribution, with the additional
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* restriction that this additional notice be included and maintained
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* on all distributed copies.
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*
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* This module serves to replace the original parser module written
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* by Guido. The functionality is not matched precisely, but the
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* original may be implemented on top of this. This is desirable
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* since the source of the text to be parsed is now divorced from
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* this interface.
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*
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* Unlike the prior interface, the ability to give a parse tree
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* produced by Python code as a tuple to the compiler is enabled by
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* this module. See the documentation for more details.
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*
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* I've added some annotations that help with the lint code-checking
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* program, but they're not complete by a long shot. The real errors
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* that lint detects are gone, but there are still warnings with
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* Py_[X]DECREF() and Py_[X]INCREF() macros. The lint annotations
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* look like "NOTE(...)".
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*/
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#include "Python.h" /* general Python API */
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#include "Python-ast.h" /* mod_ty */
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#include "graminit.h" /* symbols defined in the grammar */
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#include "node.h" /* internal parser structure */
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#include "errcode.h" /* error codes for PyNode_*() */
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#include "token.h" /* token definitions */
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#include "grammar.h"
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#include "parsetok.h"
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/* ISTERMINAL() / ISNONTERMINAL() */
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#include "compile.h"
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#undef Yield
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#include "ast.h"
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#include "pyarena.h"
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extern grammar _PyParser_Grammar; /* From graminit.c */
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#ifdef lint
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#include <note.h>
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#else
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#define NOTE(x)
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#endif
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/* String constants used to initialize module attributes.
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*
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*/
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static char parser_copyright_string[] =
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"Copyright 1995-1996 by Virginia Polytechnic Institute & State\n\
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University, Blacksburg, Virginia, USA, and Fred L. Drake, Jr., Reston,\n\
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Virginia, USA. Portions copyright 1991-1995 by Stichting Mathematisch\n\
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Centrum, Amsterdam, The Netherlands.";
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PyDoc_STRVAR(parser_doc_string,
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"This is an interface to Python's internal parser.");
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static char parser_version_string[] = "0.5";
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typedef PyObject* (*SeqMaker) (Py_ssize_t length);
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typedef int (*SeqInserter) (PyObject* sequence,
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Py_ssize_t index,
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PyObject* element);
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/* The function below is copyrighted by Stichting Mathematisch Centrum. The
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* original copyright statement is included below, and continues to apply
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* in full to the function immediately following. All other material is
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* original, copyrighted by Fred L. Drake, Jr. and Virginia Polytechnic
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* Institute and State University. Changes were made to comply with the
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* new naming conventions. Added arguments to provide support for creating
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* lists as well as tuples, and optionally including the line numbers.
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*/
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static PyObject*
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node2tuple(node *n, /* node to convert */
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SeqMaker mkseq, /* create sequence */
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SeqInserter addelem, /* func. to add elem. in seq. */
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int lineno, /* include line numbers? */
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int col_offset) /* include column offsets? */
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{
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if (n == NULL) {
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Py_INCREF(Py_None);
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return (Py_None);
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}
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if (ISNONTERMINAL(TYPE(n))) {
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int i;
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PyObject *v;
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PyObject *w;
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v = mkseq(1 + NCH(n) + (TYPE(n) == encoding_decl));
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if (v == NULL)
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return (v);
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w = PyLong_FromLong(TYPE(n));
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if (w == NULL) {
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Py_DECREF(v);
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return ((PyObject*) NULL);
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}
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(void) addelem(v, 0, w);
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for (i = 0; i < NCH(n); i++) {
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w = node2tuple(CHILD(n, i), mkseq, addelem, lineno, col_offset);
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if (w == NULL) {
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Py_DECREF(v);
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return ((PyObject*) NULL);
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}
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(void) addelem(v, i+1, w);
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}
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if (TYPE(n) == encoding_decl)
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(void) addelem(v, i+1, PyUnicode_FromString(STR(n)));
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return (v);
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}
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else if (ISTERMINAL(TYPE(n))) {
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PyObject *result = mkseq(2 + lineno + col_offset);
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if (result != NULL) {
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(void) addelem(result, 0, PyLong_FromLong(TYPE(n)));
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(void) addelem(result, 1, PyUnicode_FromString(STR(n)));
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if (lineno == 1)
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(void) addelem(result, 2, PyLong_FromLong(n->n_lineno));
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if (col_offset == 1)
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(void) addelem(result, 3, PyLong_FromLong(n->n_col_offset));
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}
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return (result);
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}
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else {
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PyErr_SetString(PyExc_SystemError,
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"unrecognized parse tree node type");
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return ((PyObject*) NULL);
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}
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}
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/*
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* End of material copyrighted by Stichting Mathematisch Centrum.
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*/
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/* There are two types of intermediate objects we're interested in:
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* 'eval' and 'exec' types. These constants can be used in the st_type
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* field of the object type to identify which any given object represents.
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* These should probably go in an external header to allow other extensions
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* to use them, but then, we really should be using C++ too. ;-)
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*/
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#define PyST_EXPR 1
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#define PyST_SUITE 2
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/* These are the internal objects and definitions required to implement the
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* ST type. Most of the internal names are more reminiscent of the 'old'
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* naming style, but the code uses the new naming convention.
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*/
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static PyObject*
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parser_error = 0;
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typedef struct {
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PyObject_HEAD /* standard object header */
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node* st_node; /* the node* returned by the parser */
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int st_type; /* EXPR or SUITE ? */
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PyCompilerFlags st_flags; /* Parser and compiler flags */
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} PyST_Object;
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static void parser_free(PyST_Object *st);
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static int parser_compare(PyST_Object *left, PyST_Object *right);
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static PyObject* parser_compilest(PyST_Object *, PyObject *, PyObject *);
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static PyObject* parser_isexpr(PyST_Object *, PyObject *, PyObject *);
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static PyObject* parser_issuite(PyST_Object *, PyObject *, PyObject *);
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static PyObject* parser_st2list(PyST_Object *, PyObject *, PyObject *);
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static PyObject* parser_st2tuple(PyST_Object *, PyObject *, PyObject *);
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#define PUBLIC_METHOD_TYPE (METH_VARARGS|METH_KEYWORDS)
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static PyMethodDef parser_methods[] = {
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{"compile", (PyCFunction)parser_compilest, PUBLIC_METHOD_TYPE,
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PyDoc_STR("Compile this ST object into a code object.")},
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{"isexpr", (PyCFunction)parser_isexpr, PUBLIC_METHOD_TYPE,
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PyDoc_STR("Determines if this ST object was created from an expression.")},
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{"issuite", (PyCFunction)parser_issuite, PUBLIC_METHOD_TYPE,
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PyDoc_STR("Determines if this ST object was created from a suite.")},
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{"tolist", (PyCFunction)parser_st2list, PUBLIC_METHOD_TYPE,
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PyDoc_STR("Creates a list-tree representation of this ST.")},
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{"totuple", (PyCFunction)parser_st2tuple, PUBLIC_METHOD_TYPE,
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PyDoc_STR("Creates a tuple-tree representation of this ST.")},
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{NULL, NULL, 0, NULL}
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};
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static
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PyTypeObject PyST_Type = {
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PyVarObject_HEAD_INIT(NULL, 0)
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"parser.st", /* tp_name */
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(int) sizeof(PyST_Object), /* tp_basicsize */
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0, /* tp_itemsize */
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(destructor)parser_free, /* tp_dealloc */
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0, /* tp_print */
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0, /* tp_getattr */
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0, /* tp_setattr */
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(cmpfunc)parser_compare, /* tp_compare */
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0, /* tp_repr */
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0, /* tp_as_number */
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0, /* tp_as_sequence */
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0, /* tp_as_mapping */
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0, /* tp_hash */
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0, /* tp_call */
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0, /* tp_str */
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0, /* tp_getattro */
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0, /* tp_setattro */
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/* Functions to access object as input/output buffer */
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0, /* tp_as_buffer */
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Py_TPFLAGS_DEFAULT, /* tp_flags */
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/* __doc__ */
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"Intermediate representation of a Python parse tree.",
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0, /* tp_traverse */
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0, /* tp_clear */
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0, /* tp_richcompare */
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0, /* tp_weaklistoffset */
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0, /* tp_iter */
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0, /* tp_iternext */
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parser_methods, /* tp_methods */
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}; /* PyST_Type */
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static int
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parser_compare_nodes(node *left, node *right)
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{
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int j;
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if (TYPE(left) < TYPE(right))
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return (-1);
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if (TYPE(right) < TYPE(left))
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return (1);
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if (ISTERMINAL(TYPE(left)))
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return (strcmp(STR(left), STR(right)));
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if (NCH(left) < NCH(right))
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return (-1);
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if (NCH(right) < NCH(left))
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return (1);
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for (j = 0; j < NCH(left); ++j) {
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int v = parser_compare_nodes(CHILD(left, j), CHILD(right, j));
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if (v != 0)
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return (v);
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}
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return (0);
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}
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/* int parser_compare(PyST_Object* left, PyST_Object* right)
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*
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* Comparison function used by the Python operators ==, !=, <, >, <=, >=
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* This really just wraps a call to parser_compare_nodes() with some easy
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* checks and protection code.
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*
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*/
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static int
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parser_compare(PyST_Object *left, PyST_Object *right)
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{
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if (left == right)
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return (0);
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if ((left == 0) || (right == 0))
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return (-1);
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return (parser_compare_nodes(left->st_node, right->st_node));
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}
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/* parser_newstobject(node* st)
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*
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* Allocates a new Python object representing an ST. This is simply the
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* 'wrapper' object that holds a node* and allows it to be passed around in
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* Python code.
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*
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*/
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static PyObject*
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parser_newstobject(node *st, int type)
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{
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PyST_Object* o = PyObject_New(PyST_Object, &PyST_Type);
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if (o != 0) {
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o->st_node = st;
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o->st_type = type;
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o->st_flags.cf_flags = 0;
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}
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else {
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PyNode_Free(st);
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}
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return ((PyObject*)o);
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}
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/* void parser_free(PyST_Object* st)
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*
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* This is called by a del statement that reduces the reference count to 0.
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*
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*/
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static void
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parser_free(PyST_Object *st)
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{
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PyNode_Free(st->st_node);
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PyObject_Del(st);
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}
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/* parser_st2tuple(PyObject* self, PyObject* args, PyObject* kw)
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*
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* This provides conversion from a node* to a tuple object that can be
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* returned to the Python-level caller. The ST object is not modified.
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*
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*/
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static PyObject*
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parser_st2tuple(PyST_Object *self, PyObject *args, PyObject *kw)
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{
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PyObject *line_option = 0;
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PyObject *col_option = 0;
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PyObject *res = 0;
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int ok;
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static char *keywords[] = {"st", "line_info", "col_info", NULL};
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if (self == NULL || PyModule_Check(self)) {
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ok = PyArg_ParseTupleAndKeywords(args, kw, "O!|OO:st2tuple", keywords,
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&PyST_Type, &self, &line_option,
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&col_option);
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}
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else
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ok = PyArg_ParseTupleAndKeywords(args, kw, "|OO:totuple", &keywords[1],
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&line_option, &col_option);
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if (ok != 0) {
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int lineno = 0;
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int col_offset = 0;
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if (line_option != NULL) {
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lineno = (PyObject_IsTrue(line_option) != 0) ? 1 : 0;
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}
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if (col_option != NULL) {
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col_offset = (PyObject_IsTrue(col_option) != 0) ? 1 : 0;
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}
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/*
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* Convert ST into a tuple representation. Use Guido's function,
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* since it's known to work already.
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*/
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res = node2tuple(((PyST_Object*)self)->st_node,
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PyTuple_New, PyTuple_SetItem, lineno, col_offset);
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}
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return (res);
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}
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|
|
|
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/* parser_st2list(PyObject* self, PyObject* args, PyObject* kw)
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*
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* This provides conversion from a node* to a list object that can be
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* returned to the Python-level caller. The ST object is not modified.
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*
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*/
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static PyObject*
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parser_st2list(PyST_Object *self, PyObject *args, PyObject *kw)
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{
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PyObject *line_option = 0;
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PyObject *col_option = 0;
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PyObject *res = 0;
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int ok;
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static char *keywords[] = {"st", "line_info", "col_info", NULL};
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if (self == NULL || PyModule_Check(self))
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ok = PyArg_ParseTupleAndKeywords(args, kw, "O!|OO:st2list", keywords,
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&PyST_Type, &self, &line_option,
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&col_option);
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else
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ok = PyArg_ParseTupleAndKeywords(args, kw, "|OO:tolist", &keywords[1],
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&line_option, &col_option);
|
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if (ok) {
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int lineno = 0;
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int col_offset = 0;
|
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if (line_option != 0) {
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lineno = PyObject_IsTrue(line_option) ? 1 : 0;
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|
}
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if (col_option != NULL) {
|
|
col_offset = (PyObject_IsTrue(col_option) != 0) ? 1 : 0;
|
|
}
|
|
/*
|
|
* Convert ST into a tuple representation. Use Guido's function,
|
|
* since it's known to work already.
|
|
*/
|
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res = node2tuple(self->st_node,
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PyList_New, PyList_SetItem, lineno, col_offset);
|
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}
|
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return (res);
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}
|
|
|
|
|
|
/* parser_compilest(PyObject* self, PyObject* args)
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|
*
|
|
* This function creates code objects from the parse tree represented by
|
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* the passed-in data object. An optional file name is passed in as well.
|
|
*
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*/
|
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static PyObject*
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parser_compilest(PyST_Object *self, PyObject *args, PyObject *kw)
|
|
{
|
|
PyObject* res = 0;
|
|
PyArena* arena;
|
|
mod_ty mod;
|
|
char* str = "<syntax-tree>";
|
|
int ok;
|
|
|
|
static char *keywords[] = {"st", "filename", NULL};
|
|
|
|
if (self == NULL || PyModule_Check(self))
|
|
ok = PyArg_ParseTupleAndKeywords(args, kw, "O!|s:compilest", keywords,
|
|
&PyST_Type, &self, &str);
|
|
else
|
|
ok = PyArg_ParseTupleAndKeywords(args, kw, "|s:compile", &keywords[1],
|
|
&str);
|
|
|
|
if (ok) {
|
|
arena = PyArena_New();
|
|
if (arena) {
|
|
mod = PyAST_FromNode(self->st_node, &(self->st_flags), str, arena);
|
|
if (mod) {
|
|
res = (PyObject *)PyAST_Compile(mod, str, &(self->st_flags), arena);
|
|
}
|
|
PyArena_Free(arena);
|
|
}
|
|
}
|
|
|
|
return (res);
|
|
}
|
|
|
|
|
|
/* PyObject* parser_isexpr(PyObject* self, PyObject* args)
|
|
* PyObject* parser_issuite(PyObject* self, PyObject* args)
|
|
*
|
|
* Checks the passed-in ST object to determine if it is an expression or
|
|
* a statement suite, respectively. The return is a Python truth value.
|
|
*
|
|
*/
|
|
static PyObject*
|
|
parser_isexpr(PyST_Object *self, PyObject *args, PyObject *kw)
|
|
{
|
|
PyObject* res = 0;
|
|
int ok;
|
|
|
|
static char *keywords[] = {"st", NULL};
|
|
|
|
if (self == NULL || PyModule_Check(self))
|
|
ok = PyArg_ParseTupleAndKeywords(args, kw, "O!:isexpr", keywords,
|
|
&PyST_Type, &self);
|
|
else
|
|
ok = PyArg_ParseTupleAndKeywords(args, kw, ":isexpr", &keywords[1]);
|
|
|
|
if (ok) {
|
|
/* Check to see if the ST represents an expression or not. */
|
|
res = (self->st_type == PyST_EXPR) ? Py_True : Py_False;
|
|
Py_INCREF(res);
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
static PyObject*
|
|
parser_issuite(PyST_Object *self, PyObject *args, PyObject *kw)
|
|
{
|
|
PyObject* res = 0;
|
|
int ok;
|
|
|
|
static char *keywords[] = {"st", NULL};
|
|
|
|
if (self == NULL || PyModule_Check(self))
|
|
ok = PyArg_ParseTupleAndKeywords(args, kw, "O!:issuite", keywords,
|
|
&PyST_Type, &self);
|
|
else
|
|
ok = PyArg_ParseTupleAndKeywords(args, kw, ":issuite", &keywords[1]);
|
|
|
|
if (ok) {
|
|
/* Check to see if the ST represents an expression or not. */
|
|
res = (self->st_type == PyST_EXPR) ? Py_False : Py_True;
|
|
Py_INCREF(res);
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
/* err_string(char* message)
|
|
*
|
|
* Sets the error string for an exception of type ParserError.
|
|
*
|
|
*/
|
|
static void
|
|
err_string(char *message)
|
|
{
|
|
PyErr_SetString(parser_error, message);
|
|
}
|
|
|
|
|
|
/* PyObject* parser_do_parse(PyObject* args, int type)
|
|
*
|
|
* Internal function to actually execute the parse and return the result if
|
|
* successful or set an exception if not.
|
|
*
|
|
*/
|
|
static PyObject*
|
|
parser_do_parse(PyObject *args, PyObject *kw, char *argspec, int type)
|
|
{
|
|
char* string = 0;
|
|
PyObject* res = 0;
|
|
int flags = 0;
|
|
perrdetail err;
|
|
|
|
static char *keywords[] = {"source", NULL};
|
|
|
|
if (PyArg_ParseTupleAndKeywords(args, kw, argspec, keywords, &string)) {
|
|
node* n = PyParser_ParseStringFlagsFilenameEx(string, NULL,
|
|
&_PyParser_Grammar,
|
|
(type == PyST_EXPR)
|
|
? eval_input : file_input,
|
|
&err, &flags);
|
|
|
|
if (n) {
|
|
res = parser_newstobject(n, type);
|
|
if (res)
|
|
((PyST_Object *)res)->st_flags.cf_flags = flags & PyCF_MASK;
|
|
}
|
|
else
|
|
PyParser_SetError(&err);
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
/* PyObject* parser_expr(PyObject* self, PyObject* args)
|
|
* PyObject* parser_suite(PyObject* self, PyObject* args)
|
|
*
|
|
* External interfaces to the parser itself. Which is called determines if
|
|
* the parser attempts to recognize an expression ('eval' form) or statement
|
|
* suite ('exec' form). The real work is done by parser_do_parse() above.
|
|
*
|
|
*/
|
|
static PyObject*
|
|
parser_expr(PyST_Object *self, PyObject *args, PyObject *kw)
|
|
{
|
|
NOTE(ARGUNUSED(self))
|
|
return (parser_do_parse(args, kw, "s:expr", PyST_EXPR));
|
|
}
|
|
|
|
|
|
static PyObject*
|
|
parser_suite(PyST_Object *self, PyObject *args, PyObject *kw)
|
|
{
|
|
NOTE(ARGUNUSED(self))
|
|
return (parser_do_parse(args, kw, "s:suite", PyST_SUITE));
|
|
}
|
|
|
|
|
|
|
|
/* This is the messy part of the code. Conversion from a tuple to an ST
|
|
* object requires that the input tuple be valid without having to rely on
|
|
* catching an exception from the compiler. This is done to allow the
|
|
* compiler itself to remain fast, since most of its input will come from
|
|
* the parser directly, and therefore be known to be syntactically correct.
|
|
* This validation is done to ensure that we don't core dump the compile
|
|
* phase, returning an exception instead.
|
|
*
|
|
* Two aspects can be broken out in this code: creating a node tree from
|
|
* the tuple passed in, and verifying that it is indeed valid. It may be
|
|
* advantageous to expand the number of ST types to include funcdefs and
|
|
* lambdadefs to take advantage of the optimizer, recognizing those STs
|
|
* here. They are not necessary, and not quite as useful in a raw form.
|
|
* For now, let's get expressions and suites working reliably.
|
|
*/
|
|
|
|
|
|
static node* build_node_tree(PyObject *tuple);
|
|
static int validate_expr_tree(node *tree);
|
|
static int validate_file_input(node *tree);
|
|
static int validate_encoding_decl(node *tree);
|
|
|
|
/* PyObject* parser_tuple2st(PyObject* self, PyObject* args)
|
|
*
|
|
* This is the public function, called from the Python code. It receives a
|
|
* single tuple object from the caller, and creates an ST object if the
|
|
* tuple can be validated. It does this by checking the first code of the
|
|
* tuple, and, if acceptable, builds the internal representation. If this
|
|
* step succeeds, the internal representation is validated as fully as
|
|
* possible with the various validate_*() routines defined below.
|
|
*
|
|
* This function must be changed if support is to be added for PyST_FRAGMENT
|
|
* ST objects.
|
|
*
|
|
*/
|
|
static PyObject*
|
|
parser_tuple2st(PyST_Object *self, PyObject *args, PyObject *kw)
|
|
{
|
|
NOTE(ARGUNUSED(self))
|
|
PyObject *st = 0;
|
|
PyObject *tuple;
|
|
node *tree;
|
|
|
|
static char *keywords[] = {"sequence", NULL};
|
|
|
|
if (!PyArg_ParseTupleAndKeywords(args, kw, "O:sequence2st", keywords,
|
|
&tuple))
|
|
return (0);
|
|
if (!PySequence_Check(tuple)) {
|
|
PyErr_SetString(PyExc_ValueError,
|
|
"sequence2st() requires a single sequence argument");
|
|
return (0);
|
|
}
|
|
/*
|
|
* Convert the tree to the internal form before checking it.
|
|
*/
|
|
tree = build_node_tree(tuple);
|
|
if (tree != 0) {
|
|
int start_sym = TYPE(tree);
|
|
if (start_sym == eval_input) {
|
|
/* Might be an eval form. */
|
|
if (validate_expr_tree(tree))
|
|
st = parser_newstobject(tree, PyST_EXPR);
|
|
else
|
|
PyNode_Free(tree);
|
|
}
|
|
else if (start_sym == file_input) {
|
|
/* This looks like an exec form so far. */
|
|
if (validate_file_input(tree))
|
|
st = parser_newstobject(tree, PyST_SUITE);
|
|
else
|
|
PyNode_Free(tree);
|
|
}
|
|
else if (start_sym == encoding_decl) {
|
|
/* This looks like an encoding_decl so far. */
|
|
if (validate_encoding_decl(tree))
|
|
st = parser_newstobject(tree, PyST_SUITE);
|
|
else
|
|
PyNode_Free(tree);
|
|
}
|
|
else {
|
|
/* This is a fragment, at best. */
|
|
PyNode_Free(tree);
|
|
err_string("parse tree does not use a valid start symbol");
|
|
}
|
|
}
|
|
/* Make sure we throw an exception on all errors. We should never
|
|
* get this, but we'd do well to be sure something is done.
|
|
*/
|
|
if (st == NULL && !PyErr_Occurred())
|
|
err_string("unspecified ST error occurred");
|
|
|
|
return st;
|
|
}
|
|
|
|
|
|
/* node* build_node_children()
|
|
*
|
|
* Iterate across the children of the current non-terminal node and build
|
|
* their structures. If successful, return the root of this portion of
|
|
* the tree, otherwise, 0. Any required exception will be specified already,
|
|
* and no memory will have been deallocated.
|
|
*
|
|
*/
|
|
static node*
|
|
build_node_children(PyObject *tuple, node *root, int *line_num)
|
|
{
|
|
Py_ssize_t len = PyObject_Size(tuple);
|
|
Py_ssize_t i;
|
|
int err;
|
|
|
|
for (i = 1; i < len; ++i) {
|
|
/* elem must always be a sequence, however simple */
|
|
PyObject* elem = PySequence_GetItem(tuple, i);
|
|
int ok = elem != NULL;
|
|
long type = 0;
|
|
char *strn = 0;
|
|
|
|
if (ok)
|
|
ok = PySequence_Check(elem);
|
|
if (ok) {
|
|
PyObject *temp = PySequence_GetItem(elem, 0);
|
|
if (temp == NULL)
|
|
ok = 0;
|
|
else {
|
|
ok = PyLong_Check(temp);
|
|
if (ok)
|
|
type = PyLong_AS_LONG(temp);
|
|
Py_DECREF(temp);
|
|
}
|
|
}
|
|
if (!ok) {
|
|
PyObject *err = Py_BuildValue("os", elem,
|
|
"Illegal node construct.");
|
|
PyErr_SetObject(parser_error, err);
|
|
Py_XDECREF(err);
|
|
Py_XDECREF(elem);
|
|
return (0);
|
|
}
|
|
if (ISTERMINAL(type)) {
|
|
Py_ssize_t len = PyObject_Size(elem);
|
|
PyObject *temp;
|
|
const char *temp_str;
|
|
|
|
if ((len != 2) && (len != 3)) {
|
|
err_string("terminal nodes must have 2 or 3 entries");
|
|
return 0;
|
|
}
|
|
temp = PySequence_GetItem(elem, 1);
|
|
if (temp == NULL)
|
|
return 0;
|
|
if (!PyUnicode_Check(temp)) {
|
|
PyErr_Format(parser_error,
|
|
"second item in terminal node must be a string,"
|
|
" found %s",
|
|
Py_TYPE(temp)->tp_name);
|
|
Py_DECREF(temp);
|
|
Py_DECREF(elem);
|
|
return 0;
|
|
}
|
|
if (len == 3) {
|
|
PyObject *o = PySequence_GetItem(elem, 2);
|
|
if (o != NULL) {
|
|
if (PyLong_Check(o))
|
|
*line_num = PyLong_AS_LONG(o);
|
|
else {
|
|
PyErr_Format(parser_error,
|
|
"third item in terminal node must be an"
|
|
" integer, found %s",
|
|
Py_TYPE(temp)->tp_name);
|
|
Py_DECREF(o);
|
|
Py_DECREF(temp);
|
|
Py_DECREF(elem);
|
|
return 0;
|
|
}
|
|
Py_DECREF(o);
|
|
}
|
|
}
|
|
temp_str = _PyUnicode_AsStringAndSize(temp, &len);
|
|
strn = (char *)PyObject_MALLOC(len + 1);
|
|
if (strn != NULL)
|
|
(void) memcpy(strn, temp_str, len + 1);
|
|
Py_DECREF(temp);
|
|
}
|
|
else if (!ISNONTERMINAL(type)) {
|
|
/*
|
|
* It has to be one or the other; this is an error.
|
|
* Throw an exception.
|
|
*/
|
|
PyObject *err = Py_BuildValue("os", elem, "unknown node type.");
|
|
PyErr_SetObject(parser_error, err);
|
|
Py_XDECREF(err);
|
|
Py_XDECREF(elem);
|
|
return (0);
|
|
}
|
|
err = PyNode_AddChild(root, type, strn, *line_num, 0);
|
|
if (err == E_NOMEM) {
|
|
Py_XDECREF(elem);
|
|
PyObject_FREE(strn);
|
|
return (node *) PyErr_NoMemory();
|
|
}
|
|
if (err == E_OVERFLOW) {
|
|
Py_XDECREF(elem);
|
|
PyObject_FREE(strn);
|
|
PyErr_SetString(PyExc_ValueError,
|
|
"unsupported number of child nodes");
|
|
return NULL;
|
|
}
|
|
|
|
if (ISNONTERMINAL(type)) {
|
|
node* new_child = CHILD(root, i - 1);
|
|
|
|
if (new_child != build_node_children(elem, new_child, line_num)) {
|
|
Py_XDECREF(elem);
|
|
return (0);
|
|
}
|
|
}
|
|
else if (type == NEWLINE) { /* It's true: we increment the */
|
|
++(*line_num); /* line number *after* the newline! */
|
|
}
|
|
Py_XDECREF(elem);
|
|
}
|
|
return root;
|
|
}
|
|
|
|
|
|
static node*
|
|
build_node_tree(PyObject *tuple)
|
|
{
|
|
node* res = 0;
|
|
PyObject *temp = PySequence_GetItem(tuple, 0);
|
|
long num = -1;
|
|
|
|
if (temp != NULL)
|
|
num = PyLong_AsLong(temp);
|
|
Py_XDECREF(temp);
|
|
if (ISTERMINAL(num)) {
|
|
/*
|
|
* The tuple is simple, but it doesn't start with a start symbol.
|
|
* Throw an exception now and be done with it.
|
|
*/
|
|
tuple = Py_BuildValue("os", tuple,
|
|
"Illegal syntax-tree; cannot start with terminal symbol.");
|
|
PyErr_SetObject(parser_error, tuple);
|
|
Py_XDECREF(tuple);
|
|
}
|
|
else if (ISNONTERMINAL(num)) {
|
|
/*
|
|
* Not efficient, but that can be handled later.
|
|
*/
|
|
int line_num = 0;
|
|
PyObject *encoding = NULL;
|
|
|
|
if (num == encoding_decl) {
|
|
encoding = PySequence_GetItem(tuple, 2);
|
|
/* tuple isn't borrowed anymore here, need to DECREF */
|
|
tuple = PySequence_GetSlice(tuple, 0, 2);
|
|
}
|
|
res = PyNode_New(num);
|
|
if (res != NULL) {
|
|
if (res != build_node_children(tuple, res, &line_num)) {
|
|
PyNode_Free(res);
|
|
res = NULL;
|
|
}
|
|
if (res && encoding) {
|
|
Py_ssize_t len;
|
|
const char *temp;
|
|
temp = _PyUnicode_AsStringAndSize(encoding, &len);
|
|
res->n_str = (char *)PyObject_MALLOC(len + 1);
|
|
if (res->n_str != NULL && temp != NULL)
|
|
(void) memcpy(res->n_str, temp, len + 1);
|
|
Py_DECREF(encoding);
|
|
Py_DECREF(tuple);
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
/* The tuple is illegal -- if the number is neither TERMINAL nor
|
|
* NONTERMINAL, we can't use it. Not sure the implementation
|
|
* allows this condition, but the API doesn't preclude it.
|
|
*/
|
|
PyObject *err = Py_BuildValue("os", tuple,
|
|
"Illegal component tuple.");
|
|
PyErr_SetObject(parser_error, err);
|
|
Py_XDECREF(err);
|
|
}
|
|
|
|
return (res);
|
|
}
|
|
|
|
|
|
/*
|
|
* Validation routines used within the validation section:
|
|
*/
|
|
static int validate_terminal(node *terminal, int type, char *string);
|
|
|
|
#define validate_ampersand(ch) validate_terminal(ch, AMPER, "&")
|
|
#define validate_circumflex(ch) validate_terminal(ch, CIRCUMFLEX, "^")
|
|
#define validate_colon(ch) validate_terminal(ch, COLON, ":")
|
|
#define validate_comma(ch) validate_terminal(ch, COMMA, ",")
|
|
#define validate_dedent(ch) validate_terminal(ch, DEDENT, "")
|
|
#define validate_equal(ch) validate_terminal(ch, EQUAL, "=")
|
|
#define validate_indent(ch) validate_terminal(ch, INDENT, (char*)NULL)
|
|
#define validate_lparen(ch) validate_terminal(ch, LPAR, "(")
|
|
#define validate_newline(ch) validate_terminal(ch, NEWLINE, (char*)NULL)
|
|
#define validate_rparen(ch) validate_terminal(ch, RPAR, ")")
|
|
#define validate_semi(ch) validate_terminal(ch, SEMI, ";")
|
|
#define validate_star(ch) validate_terminal(ch, STAR, "*")
|
|
#define validate_vbar(ch) validate_terminal(ch, VBAR, "|")
|
|
#define validate_doublestar(ch) validate_terminal(ch, DOUBLESTAR, "**")
|
|
#define validate_dot(ch) validate_terminal(ch, DOT, ".")
|
|
#define validate_at(ch) validate_terminal(ch, AT, "@")
|
|
#define validate_name(ch, str) validate_terminal(ch, NAME, str)
|
|
|
|
#define VALIDATER(n) static int validate_##n(node *tree)
|
|
|
|
VALIDATER(node); VALIDATER(small_stmt);
|
|
VALIDATER(class); VALIDATER(node);
|
|
VALIDATER(parameters); VALIDATER(suite);
|
|
VALIDATER(testlist); VALIDATER(varargslist);
|
|
VALIDATER(vfpdef);
|
|
VALIDATER(stmt); VALIDATER(simple_stmt);
|
|
VALIDATER(expr_stmt); VALIDATER(power);
|
|
VALIDATER(del_stmt);
|
|
VALIDATER(return_stmt); VALIDATER(raise_stmt);
|
|
VALIDATER(import_stmt); VALIDATER(import_stmt);
|
|
VALIDATER(import_name); VALIDATER(yield_stmt);
|
|
VALIDATER(global_stmt); VALIDATER(assert_stmt);
|
|
VALIDATER(compound_stmt);
|
|
VALIDATER(while); VALIDATER(for);
|
|
VALIDATER(try); VALIDATER(except_clause);
|
|
VALIDATER(test); VALIDATER(and_test);
|
|
VALIDATER(not_test); VALIDATER(comparison);
|
|
VALIDATER(comp_op);
|
|
VALIDATER(star_expr); VALIDATER(expr);
|
|
VALIDATER(xor_expr); VALIDATER(and_expr);
|
|
VALIDATER(shift_expr); VALIDATER(arith_expr);
|
|
VALIDATER(term); VALIDATER(factor);
|
|
VALIDATER(atom); VALIDATER(lambdef);
|
|
VALIDATER(trailer); VALIDATER(subscript);
|
|
VALIDATER(subscriptlist); VALIDATER(sliceop);
|
|
VALIDATER(exprlist); VALIDATER(dictorsetmaker);
|
|
VALIDATER(arglist); VALIDATER(argument);
|
|
VALIDATER(testlist1); VALIDATER(comp_for);
|
|
VALIDATER(comp_iter); VALIDATER(comp_if);
|
|
VALIDATER(testlist_comp); VALIDATER(yield_expr);
|
|
VALIDATER(yield_or_testlist); VALIDATER(or_test);
|
|
VALIDATER(test_nocond); VALIDATER(lambdef_nocond);
|
|
|
|
#undef VALIDATER
|
|
|
|
#define is_even(n) (((n) & 1) == 0)
|
|
#define is_odd(n) (((n) & 1) == 1)
|
|
|
|
|
|
static int
|
|
validate_ntype(node *n, int t)
|
|
{
|
|
if (TYPE(n) != t) {
|
|
PyErr_Format(parser_error, "Expected node type %d, got %d.",
|
|
t, TYPE(n));
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
/* Verifies that the number of child nodes is exactly 'num', raising
|
|
* an exception if it isn't. The exception message does not indicate
|
|
* the exact number of nodes, allowing this to be used to raise the
|
|
* "right" exception when the wrong number of nodes is present in a
|
|
* specific variant of a statement's syntax. This is commonly used
|
|
* in that fashion.
|
|
*/
|
|
static int
|
|
validate_numnodes(node *n, int num, const char *const name)
|
|
{
|
|
if (NCH(n) != num) {
|
|
PyErr_Format(parser_error,
|
|
"Illegal number of children for %s node.", name);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int
|
|
validate_terminal(node *terminal, int type, char *string)
|
|
{
|
|
int res = (validate_ntype(terminal, type)
|
|
&& ((string == 0) || (strcmp(string, STR(terminal)) == 0)));
|
|
|
|
if (!res && !PyErr_Occurred()) {
|
|
PyErr_Format(parser_error,
|
|
"Illegal terminal: expected \"%s\"", string);
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
/* X (',' X) [',']
|
|
*/
|
|
static int
|
|
validate_repeating_list(node *tree, int ntype, int (*vfunc)(node *),
|
|
const char *const name)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = (nch && validate_ntype(tree, ntype)
|
|
&& vfunc(CHILD(tree, 0)));
|
|
|
|
if (!res && !PyErr_Occurred())
|
|
(void) validate_numnodes(tree, 1, name);
|
|
else {
|
|
if (is_even(nch))
|
|
res = validate_comma(CHILD(tree, --nch));
|
|
if (res && nch > 1) {
|
|
int pos = 1;
|
|
for ( ; res && pos < nch; pos += 2)
|
|
res = (validate_comma(CHILD(tree, pos))
|
|
&& vfunc(CHILD(tree, pos + 1)));
|
|
}
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
/* validate_class()
|
|
*
|
|
* classdef:
|
|
* 'class' NAME ['(' testlist ')'] ':' suite
|
|
*/
|
|
static int
|
|
validate_class(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, classdef) &&
|
|
((nch == 4) || (nch == 6) || (nch == 7)));
|
|
|
|
if (res) {
|
|
res = (validate_name(CHILD(tree, 0), "class")
|
|
&& validate_ntype(CHILD(tree, 1), NAME)
|
|
&& validate_colon(CHILD(tree, nch - 2))
|
|
&& validate_suite(CHILD(tree, nch - 1)));
|
|
}
|
|
else {
|
|
(void) validate_numnodes(tree, 4, "class");
|
|
}
|
|
|
|
if (res) {
|
|
if (nch == 7) {
|
|
res = ((validate_lparen(CHILD(tree, 2)) &&
|
|
validate_arglist(CHILD(tree, 3)) &&
|
|
validate_rparen(CHILD(tree, 4))));
|
|
}
|
|
else if (nch == 6) {
|
|
res = (validate_lparen(CHILD(tree,2)) &&
|
|
validate_rparen(CHILD(tree,3)));
|
|
}
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
/* if_stmt:
|
|
* 'if' test ':' suite ('elif' test ':' suite)* ['else' ':' suite]
|
|
*/
|
|
static int
|
|
validate_if(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, if_stmt)
|
|
&& (nch >= 4)
|
|
&& validate_name(CHILD(tree, 0), "if")
|
|
&& validate_test(CHILD(tree, 1))
|
|
&& validate_colon(CHILD(tree, 2))
|
|
&& validate_suite(CHILD(tree, 3)));
|
|
|
|
if (res && ((nch % 4) == 3)) {
|
|
/* ... 'else' ':' suite */
|
|
res = (validate_name(CHILD(tree, nch - 3), "else")
|
|
&& validate_colon(CHILD(tree, nch - 2))
|
|
&& validate_suite(CHILD(tree, nch - 1)));
|
|
nch -= 3;
|
|
}
|
|
else if (!res && !PyErr_Occurred())
|
|
(void) validate_numnodes(tree, 4, "if");
|
|
if ((nch % 4) != 0)
|
|
/* Will catch the case for nch < 4 */
|
|
res = validate_numnodes(tree, 0, "if");
|
|
else if (res && (nch > 4)) {
|
|
/* ... ('elif' test ':' suite)+ ... */
|
|
int j = 4;
|
|
while ((j < nch) && res) {
|
|
res = (validate_name(CHILD(tree, j), "elif")
|
|
&& validate_colon(CHILD(tree, j + 2))
|
|
&& validate_test(CHILD(tree, j + 1))
|
|
&& validate_suite(CHILD(tree, j + 3)));
|
|
j += 4;
|
|
}
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
/* parameters:
|
|
* '(' [varargslist] ')'
|
|
*
|
|
*/
|
|
static int
|
|
validate_parameters(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = validate_ntype(tree, parameters) && ((nch == 2) || (nch == 3));
|
|
|
|
if (res) {
|
|
res = (validate_lparen(CHILD(tree, 0))
|
|
&& validate_rparen(CHILD(tree, nch - 1)));
|
|
if (res && (nch == 3))
|
|
res = validate_varargslist(CHILD(tree, 1));
|
|
}
|
|
else {
|
|
(void) validate_numnodes(tree, 2, "parameters");
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
/* validate_suite()
|
|
*
|
|
* suite:
|
|
* simple_stmt
|
|
* | NEWLINE INDENT stmt+ DEDENT
|
|
*/
|
|
static int
|
|
validate_suite(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, suite) && ((nch == 1) || (nch >= 4)));
|
|
|
|
if (res && (nch == 1))
|
|
res = validate_simple_stmt(CHILD(tree, 0));
|
|
else if (res) {
|
|
/* NEWLINE INDENT stmt+ DEDENT */
|
|
res = (validate_newline(CHILD(tree, 0))
|
|
&& validate_indent(CHILD(tree, 1))
|
|
&& validate_stmt(CHILD(tree, 2))
|
|
&& validate_dedent(CHILD(tree, nch - 1)));
|
|
|
|
if (res && (nch > 4)) {
|
|
int i = 3;
|
|
--nch; /* forget the DEDENT */
|
|
for ( ; res && (i < nch); ++i)
|
|
res = validate_stmt(CHILD(tree, i));
|
|
}
|
|
else if (nch < 4)
|
|
res = validate_numnodes(tree, 4, "suite");
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
static int
|
|
validate_testlist(node *tree)
|
|
{
|
|
return (validate_repeating_list(tree, testlist,
|
|
validate_test, "testlist"));
|
|
}
|
|
|
|
|
|
static int
|
|
validate_testlist1(node *tree)
|
|
{
|
|
return (validate_repeating_list(tree, testlist1,
|
|
validate_test, "testlist1"));
|
|
}
|
|
|
|
|
|
/* validate either vfpdef or tfpdef.
|
|
* vfpdef: NAME
|
|
* tfpdef: NAME [':' test]
|
|
*/
|
|
static int
|
|
validate_vfpdef(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
if (TYPE(tree) == vfpdef) {
|
|
return nch == 1 && validate_name(CHILD(tree, 0), NULL);
|
|
}
|
|
else if (TYPE(tree) == tfpdef) {
|
|
if (nch == 1) {
|
|
return validate_name(CHILD(tree, 0), NULL);
|
|
}
|
|
else if (nch == 3) {
|
|
return validate_name(CHILD(tree, 0), NULL) &&
|
|
validate_colon(CHILD(tree, 1)) &&
|
|
validate_test(CHILD(tree, 2));
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* '*' vfpdef (',' vfpdef ['=' test])* [',' '**' vfpdef] | '**' vfpdef
|
|
* ..or tfpdef in place of vfpdef. vfpdef: NAME; tfpdef: NAME [':' test]
|
|
*/
|
|
static int
|
|
validate_varargslist_trailer(node *tree, int start)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = 0, i;
|
|
int sym;
|
|
|
|
if (nch <= start) {
|
|
err_string("expected variable argument trailer for varargslist");
|
|
return 0;
|
|
}
|
|
sym = TYPE(CHILD(tree, start));
|
|
if (sym == STAR) {
|
|
/*
|
|
* '*' vfpdef (',' vfpdef ['=' test])* [',' '**' vfpdef] | '**' vfpdef
|
|
*/
|
|
if (nch-start == 2)
|
|
res = validate_vfpdef(CHILD(tree, start+1));
|
|
else if (nch-start == 5 && TYPE(CHILD(tree, start+2)) == COMMA)
|
|
res = (validate_vfpdef(CHILD(tree, start+1))
|
|
&& validate_comma(CHILD(tree, start+2))
|
|
&& validate_doublestar(CHILD(tree, start+3))
|
|
&& validate_vfpdef(CHILD(tree, start+4)));
|
|
else {
|
|
/* skip over vfpdef (',' vfpdef ['=' test])* */
|
|
i = start + 1;
|
|
if (TYPE(CHILD(tree, i)) == vfpdef ||
|
|
TYPE(CHILD(tree, i)) == tfpdef) { /* skip over vfpdef or tfpdef */
|
|
i += 1;
|
|
}
|
|
while (res && i+1 < nch) { /* validate (',' vfpdef ['=' test])* */
|
|
res = validate_comma(CHILD(tree, i));
|
|
if (TYPE(CHILD(tree, i+1)) == DOUBLESTAR)
|
|
break;
|
|
res = res && validate_vfpdef(CHILD(tree, i+1));
|
|
if (res && i+2 < nch && TYPE(CHILD(tree, i+2)) == EQUAL) {
|
|
res = res && (i+3 < nch)
|
|
&& validate_test(CHILD(tree, i+3));
|
|
i += 4;
|
|
}
|
|
else {
|
|
i += 2;
|
|
}
|
|
}
|
|
/* [',' '**' vfpdef] */
|
|
if (res && i+1 < nch && TYPE(CHILD(tree, i+1)) == DOUBLESTAR) {
|
|
res = validate_vfpdef(CHILD(tree, i+2));
|
|
}
|
|
}
|
|
}
|
|
else if (sym == DOUBLESTAR) {
|
|
/*
|
|
* '**' NAME
|
|
*/
|
|
if (nch-start == 2)
|
|
res = validate_vfpdef(CHILD(tree, start+1));
|
|
}
|
|
if (!res)
|
|
err_string("illegal variable argument trailer for varargslist");
|
|
return res;
|
|
}
|
|
|
|
|
|
/* validate_varargslist()
|
|
*
|
|
* Validate typedargslist or varargslist.
|
|
*
|
|
* typedargslist: ((tfpdef ['=' test] ',')*
|
|
* ('*' [tfpdef] (',' tfpdef ['=' test])* [',' '**' tfpdef] |
|
|
* '**' tfpdef)
|
|
* | tfpdef ['=' test] (',' tfpdef ['=' test])* [','])
|
|
* tfpdef: NAME [':' test]
|
|
* varargslist: ((vfpdef ['=' test] ',')*
|
|
* ('*' [vfpdef] (',' vfpdef ['=' test])* [',' '**' vfpdef] |
|
|
* '**' vfpdef)
|
|
* | vfpdef ['=' test] (',' vfpdef ['=' test])* [','])
|
|
* vfpdef: NAME
|
|
*
|
|
*/
|
|
static int
|
|
validate_varargslist(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = (TYPE(tree) == varargslist ||
|
|
TYPE(tree) == typedargslist) &&
|
|
(nch != 0);
|
|
int sym;
|
|
node *ch;
|
|
int i = 0;
|
|
|
|
if (!res)
|
|
return 0;
|
|
if (nch < 1) {
|
|
err_string("varargslist missing child nodes");
|
|
return 0;
|
|
}
|
|
while (i < nch) {
|
|
ch = CHILD(tree, i);
|
|
sym = TYPE(ch);
|
|
if (sym == vfpdef || sym == tfpdef) {
|
|
/* validate (vfpdef ['=' test] ',')+ */
|
|
res = validate_vfpdef(ch);
|
|
++i;
|
|
if (res && (i+2 <= nch) && TYPE(CHILD(tree, i)) == EQUAL) {
|
|
res = (validate_equal(CHILD(tree, i))
|
|
&& validate_test(CHILD(tree, i+1)));
|
|
if (res)
|
|
i += 2;
|
|
}
|
|
if (res && i < nch) {
|
|
res = validate_comma(CHILD(tree, i));
|
|
++i;
|
|
}
|
|
} else if (sym == DOUBLESTAR || sym == STAR) {
|
|
res = validate_varargslist_trailer(tree, i);
|
|
break;
|
|
} else {
|
|
res = 0;
|
|
err_string("illegal formation for varargslist");
|
|
}
|
|
}
|
|
return res;
|
|
}
|
|
|
|
|
|
/* comp_iter: comp_for | comp_if
|
|
*/
|
|
static int
|
|
validate_comp_iter(node *tree)
|
|
{
|
|
int res = (validate_ntype(tree, comp_iter)
|
|
&& validate_numnodes(tree, 1, "comp_iter"));
|
|
if (res && TYPE(CHILD(tree, 0)) == comp_for)
|
|
res = validate_comp_for(CHILD(tree, 0));
|
|
else
|
|
res = validate_comp_if(CHILD(tree, 0));
|
|
|
|
return res;
|
|
}
|
|
|
|
/* comp_for: 'for' exprlist 'in' test [comp_iter]
|
|
*/
|
|
static int
|
|
validate_comp_for(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res;
|
|
|
|
if (nch == 5)
|
|
res = validate_comp_iter(CHILD(tree, 4));
|
|
else
|
|
res = validate_numnodes(tree, 4, "comp_for");
|
|
|
|
if (res)
|
|
res = (validate_name(CHILD(tree, 0), "for")
|
|
&& validate_exprlist(CHILD(tree, 1))
|
|
&& validate_name(CHILD(tree, 2), "in")
|
|
&& validate_or_test(CHILD(tree, 3)));
|
|
|
|
return res;
|
|
}
|
|
|
|
/* comp_if: 'if' test_nocond [comp_iter]
|
|
*/
|
|
static int
|
|
validate_comp_if(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res;
|
|
|
|
if (nch == 3)
|
|
res = validate_comp_iter(CHILD(tree, 2));
|
|
else
|
|
res = validate_numnodes(tree, 2, "comp_if");
|
|
|
|
if (res)
|
|
res = (validate_name(CHILD(tree, 0), "if")
|
|
&& validate_test_nocond(CHILD(tree, 1)));
|
|
|
|
return res;
|
|
}
|
|
|
|
|
|
/* simple_stmt | compound_stmt
|
|
*
|
|
*/
|
|
static int
|
|
validate_stmt(node *tree)
|
|
{
|
|
int res = (validate_ntype(tree, stmt)
|
|
&& validate_numnodes(tree, 1, "stmt"));
|
|
|
|
if (res) {
|
|
tree = CHILD(tree, 0);
|
|
|
|
if (TYPE(tree) == simple_stmt)
|
|
res = validate_simple_stmt(tree);
|
|
else
|
|
res = validate_compound_stmt(tree);
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
/* small_stmt (';' small_stmt)* [';'] NEWLINE
|
|
*
|
|
*/
|
|
static int
|
|
validate_simple_stmt(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, simple_stmt)
|
|
&& (nch >= 2)
|
|
&& validate_small_stmt(CHILD(tree, 0))
|
|
&& validate_newline(CHILD(tree, nch - 1)));
|
|
|
|
if (nch < 2)
|
|
res = validate_numnodes(tree, 2, "simple_stmt");
|
|
--nch; /* forget the NEWLINE */
|
|
if (res && is_even(nch))
|
|
res = validate_semi(CHILD(tree, --nch));
|
|
if (res && (nch > 2)) {
|
|
int i;
|
|
|
|
for (i = 1; res && (i < nch); i += 2)
|
|
res = (validate_semi(CHILD(tree, i))
|
|
&& validate_small_stmt(CHILD(tree, i + 1)));
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
static int
|
|
validate_small_stmt(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = validate_numnodes(tree, 1, "small_stmt");
|
|
|
|
if (res) {
|
|
int ntype = TYPE(CHILD(tree, 0));
|
|
|
|
if ( (ntype == expr_stmt)
|
|
|| (ntype == del_stmt)
|
|
|| (ntype == pass_stmt)
|
|
|| (ntype == flow_stmt)
|
|
|| (ntype == import_stmt)
|
|
|| (ntype == global_stmt)
|
|
|| (ntype == assert_stmt))
|
|
res = validate_node(CHILD(tree, 0));
|
|
else {
|
|
res = 0;
|
|
err_string("illegal small_stmt child type");
|
|
}
|
|
}
|
|
else if (nch == 1) {
|
|
res = 0;
|
|
PyErr_Format(parser_error,
|
|
"Unrecognized child node of small_stmt: %d.",
|
|
TYPE(CHILD(tree, 0)));
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
/* compound_stmt:
|
|
* if_stmt | while_stmt | for_stmt | try_stmt | with_stmt | funcdef | classdef | decorated
|
|
*/
|
|
static int
|
|
validate_compound_stmt(node *tree)
|
|
{
|
|
int res = (validate_ntype(tree, compound_stmt)
|
|
&& validate_numnodes(tree, 1, "compound_stmt"));
|
|
int ntype;
|
|
|
|
if (!res)
|
|
return (0);
|
|
|
|
tree = CHILD(tree, 0);
|
|
ntype = TYPE(tree);
|
|
if ( (ntype == if_stmt)
|
|
|| (ntype == while_stmt)
|
|
|| (ntype == for_stmt)
|
|
|| (ntype == try_stmt)
|
|
|| (ntype == with_stmt)
|
|
|| (ntype == funcdef)
|
|
|| (ntype == classdef)
|
|
|| (ntype == decorated))
|
|
res = validate_node(tree);
|
|
else {
|
|
res = 0;
|
|
PyErr_Format(parser_error,
|
|
"Illegal compound statement type: %d.", TYPE(tree));
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
static int
|
|
validate_yield_or_testlist(node *tree)
|
|
{
|
|
if (TYPE(tree) == yield_expr)
|
|
return validate_yield_expr(tree);
|
|
else
|
|
return validate_testlist(tree);
|
|
}
|
|
|
|
static int
|
|
validate_expr_stmt(node *tree)
|
|
{
|
|
int j;
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, expr_stmt)
|
|
&& is_odd(nch)
|
|
&& validate_testlist(CHILD(tree, 0)));
|
|
|
|
if (res && nch == 3
|
|
&& TYPE(CHILD(tree, 1)) == augassign) {
|
|
res = validate_numnodes(CHILD(tree, 1), 1, "augassign")
|
|
&& validate_yield_or_testlist(CHILD(tree, 2));
|
|
|
|
if (res) {
|
|
char *s = STR(CHILD(CHILD(tree, 1), 0));
|
|
|
|
res = (strcmp(s, "+=") == 0
|
|
|| strcmp(s, "-=") == 0
|
|
|| strcmp(s, "*=") == 0
|
|
|| strcmp(s, "/=") == 0
|
|
|| strcmp(s, "//=") == 0
|
|
|| strcmp(s, "%=") == 0
|
|
|| strcmp(s, "&=") == 0
|
|
|| strcmp(s, "|=") == 0
|
|
|| strcmp(s, "^=") == 0
|
|
|| strcmp(s, "<<=") == 0
|
|
|| strcmp(s, ">>=") == 0
|
|
|| strcmp(s, "**=") == 0);
|
|
if (!res)
|
|
err_string("illegal augmmented assignment operator");
|
|
}
|
|
}
|
|
else {
|
|
for (j = 1; res && (j < nch); j += 2)
|
|
res = validate_equal(CHILD(tree, j))
|
|
&& validate_yield_or_testlist(CHILD(tree, j + 1));
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
static int
|
|
validate_del_stmt(node *tree)
|
|
{
|
|
return (validate_numnodes(tree, 2, "del_stmt")
|
|
&& validate_name(CHILD(tree, 0), "del")
|
|
&& validate_exprlist(CHILD(tree, 1)));
|
|
}
|
|
|
|
|
|
static int
|
|
validate_return_stmt(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, return_stmt)
|
|
&& ((nch == 1) || (nch == 2))
|
|
&& validate_name(CHILD(tree, 0), "return"));
|
|
|
|
if (res && (nch == 2))
|
|
res = validate_testlist(CHILD(tree, 1));
|
|
|
|
return (res);
|
|
}
|
|
|
|
|
|
static int
|
|
validate_raise_stmt(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, raise_stmt)
|
|
&& ((nch == 1) || (nch == 2) || (nch == 4) || (nch == 6)));
|
|
|
|
if (res) {
|
|
res = validate_name(CHILD(tree, 0), "raise");
|
|
if (res && (nch >= 2))
|
|
res = validate_test(CHILD(tree, 1));
|
|
if (res && nch > 2) {
|
|
res = (validate_comma(CHILD(tree, 2))
|
|
&& validate_test(CHILD(tree, 3)));
|
|
if (res && (nch > 4))
|
|
res = (validate_comma(CHILD(tree, 4))
|
|
&& validate_test(CHILD(tree, 5)));
|
|
}
|
|
}
|
|
else
|
|
(void) validate_numnodes(tree, 2, "raise");
|
|
if (res && (nch == 4))
|
|
res = (validate_comma(CHILD(tree, 2))
|
|
&& validate_test(CHILD(tree, 3)));
|
|
|
|
return (res);
|
|
}
|
|
|
|
|
|
/* yield_expr: 'yield' [testlist]
|
|
*/
|
|
static int
|
|
validate_yield_expr(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, yield_expr)
|
|
&& ((nch == 1) || (nch == 2))
|
|
&& validate_name(CHILD(tree, 0), "yield"));
|
|
|
|
if (res && (nch == 2))
|
|
res = validate_testlist(CHILD(tree, 1));
|
|
|
|
return (res);
|
|
}
|
|
|
|
|
|
/* yield_stmt: yield_expr
|
|
*/
|
|
static int
|
|
validate_yield_stmt(node *tree)
|
|
{
|
|
return (validate_ntype(tree, yield_stmt)
|
|
&& validate_numnodes(tree, 1, "yield_stmt")
|
|
&& validate_yield_expr(CHILD(tree, 0)));
|
|
}
|
|
|
|
|
|
static int
|
|
validate_import_as_name(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int ok = validate_ntype(tree, import_as_name);
|
|
|
|
if (ok) {
|
|
if (nch == 1)
|
|
ok = validate_name(CHILD(tree, 0), NULL);
|
|
else if (nch == 3)
|
|
ok = (validate_name(CHILD(tree, 0), NULL)
|
|
&& validate_name(CHILD(tree, 1), "as")
|
|
&& validate_name(CHILD(tree, 2), NULL));
|
|
else
|
|
ok = validate_numnodes(tree, 3, "import_as_name");
|
|
}
|
|
return ok;
|
|
}
|
|
|
|
|
|
/* dotted_name: NAME ("." NAME)*
|
|
*/
|
|
static int
|
|
validate_dotted_name(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, dotted_name)
|
|
&& is_odd(nch)
|
|
&& validate_name(CHILD(tree, 0), NULL));
|
|
int i;
|
|
|
|
for (i = 1; res && (i < nch); i += 2) {
|
|
res = (validate_dot(CHILD(tree, i))
|
|
&& validate_name(CHILD(tree, i+1), NULL));
|
|
}
|
|
return res;
|
|
}
|
|
|
|
|
|
/* dotted_as_name: dotted_name [NAME NAME]
|
|
*/
|
|
static int
|
|
validate_dotted_as_name(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = validate_ntype(tree, dotted_as_name);
|
|
|
|
if (res) {
|
|
if (nch == 1)
|
|
res = validate_dotted_name(CHILD(tree, 0));
|
|
else if (nch == 3)
|
|
res = (validate_dotted_name(CHILD(tree, 0))
|
|
&& validate_name(CHILD(tree, 1), "as")
|
|
&& validate_name(CHILD(tree, 2), NULL));
|
|
else {
|
|
res = 0;
|
|
err_string("illegal number of children for dotted_as_name");
|
|
}
|
|
}
|
|
return res;
|
|
}
|
|
|
|
|
|
/* dotted_as_name (',' dotted_as_name)* */
|
|
static int
|
|
validate_dotted_as_names(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = is_odd(nch) && validate_dotted_as_name(CHILD(tree, 0));
|
|
int i;
|
|
|
|
for (i = 1; res && (i < nch); i += 2)
|
|
res = (validate_comma(CHILD(tree, i))
|
|
&& validate_dotted_as_name(CHILD(tree, i + 1)));
|
|
return (res);
|
|
}
|
|
|
|
|
|
/* import_as_name (',' import_as_name)* [','] */
|
|
static int
|
|
validate_import_as_names(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = validate_import_as_name(CHILD(tree, 0));
|
|
int i;
|
|
|
|
for (i = 1; res && (i + 1 < nch); i += 2)
|
|
res = (validate_comma(CHILD(tree, i))
|
|
&& validate_import_as_name(CHILD(tree, i + 1)));
|
|
return (res);
|
|
}
|
|
|
|
|
|
/* 'import' dotted_as_names */
|
|
static int
|
|
validate_import_name(node *tree)
|
|
{
|
|
return (validate_ntype(tree, import_name)
|
|
&& validate_numnodes(tree, 2, "import_name")
|
|
&& validate_name(CHILD(tree, 0), "import")
|
|
&& validate_dotted_as_names(CHILD(tree, 1)));
|
|
}
|
|
|
|
/* Helper function to count the number of leading dots in
|
|
* 'from ...module import name'
|
|
*/
|
|
static int
|
|
count_from_dots(node *tree)
|
|
{
|
|
int i;
|
|
for (i = 1; i < NCH(tree); i++)
|
|
if (TYPE(CHILD(tree, i)) != DOT)
|
|
break;
|
|
return i-1;
|
|
}
|
|
|
|
/* 'from' ('.'* dotted_name | '.') 'import' ('*' | '(' import_as_names ')' |
|
|
* import_as_names
|
|
*/
|
|
static int
|
|
validate_import_from(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int ndots = count_from_dots(tree);
|
|
int havename = (TYPE(CHILD(tree, ndots + 1)) == dotted_name);
|
|
int offset = ndots + havename;
|
|
int res = validate_ntype(tree, import_from)
|
|
&& (nch >= 4 + ndots)
|
|
&& validate_name(CHILD(tree, 0), "from")
|
|
&& (!havename || validate_dotted_name(CHILD(tree, ndots + 1)))
|
|
&& validate_name(CHILD(tree, offset + 1), "import");
|
|
|
|
if (res && TYPE(CHILD(tree, offset + 2)) == LPAR)
|
|
res = ((nch == offset + 5)
|
|
&& validate_lparen(CHILD(tree, offset + 2))
|
|
&& validate_import_as_names(CHILD(tree, offset + 3))
|
|
&& validate_rparen(CHILD(tree, offset + 4)));
|
|
else if (res && TYPE(CHILD(tree, offset + 2)) != STAR)
|
|
res = validate_import_as_names(CHILD(tree, offset + 2));
|
|
return (res);
|
|
}
|
|
|
|
|
|
/* import_stmt: import_name | import_from */
|
|
static int
|
|
validate_import_stmt(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = validate_numnodes(tree, 1, "import_stmt");
|
|
|
|
if (res) {
|
|
int ntype = TYPE(CHILD(tree, 0));
|
|
|
|
if (ntype == import_name || ntype == import_from)
|
|
res = validate_node(CHILD(tree, 0));
|
|
else {
|
|
res = 0;
|
|
err_string("illegal import_stmt child type");
|
|
}
|
|
}
|
|
else if (nch == 1) {
|
|
res = 0;
|
|
PyErr_Format(parser_error,
|
|
"Unrecognized child node of import_stmt: %d.",
|
|
TYPE(CHILD(tree, 0)));
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
|
|
|
|
static int
|
|
validate_global_stmt(node *tree)
|
|
{
|
|
int j;
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, global_stmt)
|
|
&& is_even(nch) && (nch >= 2));
|
|
|
|
if (!res && !PyErr_Occurred())
|
|
err_string("illegal global statement");
|
|
|
|
if (res)
|
|
res = (validate_name(CHILD(tree, 0), "global")
|
|
&& validate_ntype(CHILD(tree, 1), NAME));
|
|
for (j = 2; res && (j < nch); j += 2)
|
|
res = (validate_comma(CHILD(tree, j))
|
|
&& validate_ntype(CHILD(tree, j + 1), NAME));
|
|
|
|
return (res);
|
|
}
|
|
|
|
|
|
/* assert_stmt:
|
|
*
|
|
* 'assert' test [',' test]
|
|
*/
|
|
static int
|
|
validate_assert_stmt(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, assert_stmt)
|
|
&& ((nch == 2) || (nch == 4))
|
|
&& (validate_name(CHILD(tree, 0), "assert"))
|
|
&& validate_test(CHILD(tree, 1)));
|
|
|
|
if (!res && !PyErr_Occurred())
|
|
err_string("illegal assert statement");
|
|
if (res && (nch > 2))
|
|
res = (validate_comma(CHILD(tree, 2))
|
|
&& validate_test(CHILD(tree, 3)));
|
|
|
|
return (res);
|
|
}
|
|
|
|
|
|
static int
|
|
validate_while(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, while_stmt)
|
|
&& ((nch == 4) || (nch == 7))
|
|
&& validate_name(CHILD(tree, 0), "while")
|
|
&& validate_test(CHILD(tree, 1))
|
|
&& validate_colon(CHILD(tree, 2))
|
|
&& validate_suite(CHILD(tree, 3)));
|
|
|
|
if (res && (nch == 7))
|
|
res = (validate_name(CHILD(tree, 4), "else")
|
|
&& validate_colon(CHILD(tree, 5))
|
|
&& validate_suite(CHILD(tree, 6)));
|
|
|
|
return (res);
|
|
}
|
|
|
|
|
|
static int
|
|
validate_for(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, for_stmt)
|
|
&& ((nch == 6) || (nch == 9))
|
|
&& validate_name(CHILD(tree, 0), "for")
|
|
&& validate_exprlist(CHILD(tree, 1))
|
|
&& validate_name(CHILD(tree, 2), "in")
|
|
&& validate_testlist(CHILD(tree, 3))
|
|
&& validate_colon(CHILD(tree, 4))
|
|
&& validate_suite(CHILD(tree, 5)));
|
|
|
|
if (res && (nch == 9))
|
|
res = (validate_name(CHILD(tree, 6), "else")
|
|
&& validate_colon(CHILD(tree, 7))
|
|
&& validate_suite(CHILD(tree, 8)));
|
|
|
|
return (res);
|
|
}
|
|
|
|
|
|
/* try_stmt:
|
|
* 'try' ':' suite (except_clause ':' suite)+ ['else' ':' suite]
|
|
* | 'try' ':' suite 'finally' ':' suite
|
|
*
|
|
*/
|
|
static int
|
|
validate_try(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int pos = 3;
|
|
int res = (validate_ntype(tree, try_stmt)
|
|
&& (nch >= 6) && ((nch % 3) == 0));
|
|
|
|
if (res)
|
|
res = (validate_name(CHILD(tree, 0), "try")
|
|
&& validate_colon(CHILD(tree, 1))
|
|
&& validate_suite(CHILD(tree, 2))
|
|
&& validate_colon(CHILD(tree, nch - 2))
|
|
&& validate_suite(CHILD(tree, nch - 1)));
|
|
else if (!PyErr_Occurred()) {
|
|
const char* name = "except";
|
|
if (TYPE(CHILD(tree, nch - 3)) != except_clause)
|
|
name = STR(CHILD(tree, nch - 3));
|
|
|
|
PyErr_Format(parser_error,
|
|
"Illegal number of children for try/%s node.", name);
|
|
}
|
|
/* Skip past except_clause sections: */
|
|
while (res && (TYPE(CHILD(tree, pos)) == except_clause)) {
|
|
res = (validate_except_clause(CHILD(tree, pos))
|
|
&& validate_colon(CHILD(tree, pos + 1))
|
|
&& validate_suite(CHILD(tree, pos + 2)));
|
|
pos += 3;
|
|
}
|
|
if (res && (pos < nch)) {
|
|
res = validate_ntype(CHILD(tree, pos), NAME);
|
|
if (res && (strcmp(STR(CHILD(tree, pos)), "finally") == 0))
|
|
res = (validate_numnodes(tree, 6, "try/finally")
|
|
&& validate_colon(CHILD(tree, 4))
|
|
&& validate_suite(CHILD(tree, 5)));
|
|
else if (res) {
|
|
if (nch == (pos + 3)) {
|
|
res = ((strcmp(STR(CHILD(tree, pos)), "except") == 0)
|
|
|| (strcmp(STR(CHILD(tree, pos)), "else") == 0));
|
|
if (!res)
|
|
err_string("illegal trailing triple in try statement");
|
|
}
|
|
else if (nch == (pos + 6)) {
|
|
res = (validate_name(CHILD(tree, pos), "except")
|
|
&& validate_colon(CHILD(tree, pos + 1))
|
|
&& validate_suite(CHILD(tree, pos + 2))
|
|
&& validate_name(CHILD(tree, pos + 3), "else"));
|
|
}
|
|
else
|
|
res = validate_numnodes(tree, pos + 3, "try/except");
|
|
}
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
static int
|
|
validate_except_clause(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, except_clause)
|
|
&& ((nch == 1) || (nch == 2) || (nch == 4))
|
|
&& validate_name(CHILD(tree, 0), "except"));
|
|
|
|
if (res && (nch > 1))
|
|
res = validate_test(CHILD(tree, 1));
|
|
if (res && (nch == 4))
|
|
res = (validate_name(CHILD(tree, 2), "as")
|
|
&& validate_ntype(CHILD(tree, 3), NAME));
|
|
|
|
return (res);
|
|
}
|
|
|
|
|
|
static int
|
|
validate_test(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = validate_ntype(tree, test) && is_odd(nch);
|
|
|
|
if (res && (TYPE(CHILD(tree, 0)) == lambdef))
|
|
res = ((nch == 1)
|
|
&& validate_lambdef(CHILD(tree, 0)));
|
|
else if (res) {
|
|
res = validate_or_test(CHILD(tree, 0));
|
|
res = (res && (nch == 1 || (nch == 5 &&
|
|
validate_name(CHILD(tree, 1), "if") &&
|
|
validate_or_test(CHILD(tree, 2)) &&
|
|
validate_name(CHILD(tree, 3), "else") &&
|
|
validate_test(CHILD(tree, 4)))));
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
static int
|
|
validate_test_nocond(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = validate_ntype(tree, test_nocond) && (nch == 1);
|
|
|
|
if (res && (TYPE(CHILD(tree, 0)) == lambdef_nocond))
|
|
res = (validate_lambdef_nocond(CHILD(tree, 0)));
|
|
else if (res) {
|
|
res = (validate_or_test(CHILD(tree, 0)));
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
static int
|
|
validate_or_test(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = validate_ntype(tree, or_test) && is_odd(nch);
|
|
|
|
if (res) {
|
|
int pos;
|
|
res = validate_and_test(CHILD(tree, 0));
|
|
for (pos = 1; res && (pos < nch); pos += 2)
|
|
res = (validate_name(CHILD(tree, pos), "or")
|
|
&& validate_and_test(CHILD(tree, pos + 1)));
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
static int
|
|
validate_and_test(node *tree)
|
|
{
|
|
int pos;
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, and_test)
|
|
&& is_odd(nch)
|
|
&& validate_not_test(CHILD(tree, 0)));
|
|
|
|
for (pos = 1; res && (pos < nch); pos += 2)
|
|
res = (validate_name(CHILD(tree, pos), "and")
|
|
&& validate_not_test(CHILD(tree, 0)));
|
|
|
|
return (res);
|
|
}
|
|
|
|
|
|
static int
|
|
validate_not_test(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = validate_ntype(tree, not_test) && ((nch == 1) || (nch == 2));
|
|
|
|
if (res) {
|
|
if (nch == 2)
|
|
res = (validate_name(CHILD(tree, 0), "not")
|
|
&& validate_not_test(CHILD(tree, 1)));
|
|
else if (nch == 1)
|
|
res = validate_comparison(CHILD(tree, 0));
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
static int
|
|
validate_comparison(node *tree)
|
|
{
|
|
int pos;
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, comparison)
|
|
&& is_odd(nch)
|
|
&& validate_star_expr(CHILD(tree, 0)));
|
|
|
|
for (pos = 1; res && (pos < nch); pos += 2)
|
|
res = (validate_comp_op(CHILD(tree, pos))
|
|
&& validate_star_expr(CHILD(tree, pos + 1)));
|
|
|
|
return (res);
|
|
}
|
|
|
|
|
|
static int
|
|
validate_comp_op(node *tree)
|
|
{
|
|
int res = 0;
|
|
int nch = NCH(tree);
|
|
|
|
if (!validate_ntype(tree, comp_op))
|
|
return (0);
|
|
if (nch == 1) {
|
|
/*
|
|
* Only child will be a terminal with a well-defined symbolic name
|
|
* or a NAME with a string of either 'is' or 'in'
|
|
*/
|
|
tree = CHILD(tree, 0);
|
|
switch (TYPE(tree)) {
|
|
case LESS:
|
|
case GREATER:
|
|
case EQEQUAL:
|
|
case EQUAL:
|
|
case LESSEQUAL:
|
|
case GREATEREQUAL:
|
|
case NOTEQUAL:
|
|
res = 1;
|
|
break;
|
|
case NAME:
|
|
res = ((strcmp(STR(tree), "in") == 0)
|
|
|| (strcmp(STR(tree), "is") == 0));
|
|
if (!res) {
|
|
PyErr_Format(parser_error,
|
|
"illegal operator '%s'", STR(tree));
|
|
}
|
|
break;
|
|
default:
|
|
err_string("illegal comparison operator type");
|
|
break;
|
|
}
|
|
}
|
|
else if ((res = validate_numnodes(tree, 2, "comp_op")) != 0) {
|
|
res = (validate_ntype(CHILD(tree, 0), NAME)
|
|
&& validate_ntype(CHILD(tree, 1), NAME)
|
|
&& (((strcmp(STR(CHILD(tree, 0)), "is") == 0)
|
|
&& (strcmp(STR(CHILD(tree, 1)), "not") == 0))
|
|
|| ((strcmp(STR(CHILD(tree, 0)), "not") == 0)
|
|
&& (strcmp(STR(CHILD(tree, 1)), "in") == 0))));
|
|
if (!res && !PyErr_Occurred())
|
|
err_string("unknown comparison operator");
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
static int
|
|
validate_star_expr(node *tree)
|
|
{
|
|
int res = validate_ntype(tree, star_expr);
|
|
if (!res) return res;
|
|
if (NCH(tree) == 2) {
|
|
return validate_ntype(CHILD(tree, 0), STAR) && \
|
|
validate_expr(CHILD(tree, 1));
|
|
} else {
|
|
return validate_expr(CHILD(tree, 0));
|
|
}
|
|
}
|
|
|
|
|
|
static int
|
|
validate_expr(node *tree)
|
|
{
|
|
int j;
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, expr)
|
|
&& is_odd(nch)
|
|
&& validate_xor_expr(CHILD(tree, 0)));
|
|
|
|
for (j = 2; res && (j < nch); j += 2)
|
|
res = (validate_xor_expr(CHILD(tree, j))
|
|
&& validate_vbar(CHILD(tree, j - 1)));
|
|
|
|
return (res);
|
|
}
|
|
|
|
|
|
static int
|
|
validate_xor_expr(node *tree)
|
|
{
|
|
int j;
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, xor_expr)
|
|
&& is_odd(nch)
|
|
&& validate_and_expr(CHILD(tree, 0)));
|
|
|
|
for (j = 2; res && (j < nch); j += 2)
|
|
res = (validate_circumflex(CHILD(tree, j - 1))
|
|
&& validate_and_expr(CHILD(tree, j)));
|
|
|
|
return (res);
|
|
}
|
|
|
|
|
|
static int
|
|
validate_and_expr(node *tree)
|
|
{
|
|
int pos;
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, and_expr)
|
|
&& is_odd(nch)
|
|
&& validate_shift_expr(CHILD(tree, 0)));
|
|
|
|
for (pos = 1; res && (pos < nch); pos += 2)
|
|
res = (validate_ampersand(CHILD(tree, pos))
|
|
&& validate_shift_expr(CHILD(tree, pos + 1)));
|
|
|
|
return (res);
|
|
}
|
|
|
|
|
|
static int
|
|
validate_chain_two_ops(node *tree, int (*termvalid)(node *), int op1, int op2)
|
|
{
|
|
int pos = 1;
|
|
int nch = NCH(tree);
|
|
int res = (is_odd(nch)
|
|
&& (*termvalid)(CHILD(tree, 0)));
|
|
|
|
for ( ; res && (pos < nch); pos += 2) {
|
|
if (TYPE(CHILD(tree, pos)) != op1)
|
|
res = validate_ntype(CHILD(tree, pos), op2);
|
|
if (res)
|
|
res = (*termvalid)(CHILD(tree, pos + 1));
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
static int
|
|
validate_shift_expr(node *tree)
|
|
{
|
|
return (validate_ntype(tree, shift_expr)
|
|
&& validate_chain_two_ops(tree, validate_arith_expr,
|
|
LEFTSHIFT, RIGHTSHIFT));
|
|
}
|
|
|
|
|
|
static int
|
|
validate_arith_expr(node *tree)
|
|
{
|
|
return (validate_ntype(tree, arith_expr)
|
|
&& validate_chain_two_ops(tree, validate_term, PLUS, MINUS));
|
|
}
|
|
|
|
|
|
static int
|
|
validate_term(node *tree)
|
|
{
|
|
int pos = 1;
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, term)
|
|
&& is_odd(nch)
|
|
&& validate_factor(CHILD(tree, 0)));
|
|
|
|
for ( ; res && (pos < nch); pos += 2)
|
|
res = (((TYPE(CHILD(tree, pos)) == STAR)
|
|
|| (TYPE(CHILD(tree, pos)) == SLASH)
|
|
|| (TYPE(CHILD(tree, pos)) == DOUBLESLASH)
|
|
|| (TYPE(CHILD(tree, pos)) == PERCENT))
|
|
&& validate_factor(CHILD(tree, pos + 1)));
|
|
|
|
return (res);
|
|
}
|
|
|
|
|
|
/* factor:
|
|
*
|
|
* factor: ('+'|'-'|'~') factor | power
|
|
*/
|
|
static int
|
|
validate_factor(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, factor)
|
|
&& (((nch == 2)
|
|
&& ((TYPE(CHILD(tree, 0)) == PLUS)
|
|
|| (TYPE(CHILD(tree, 0)) == MINUS)
|
|
|| (TYPE(CHILD(tree, 0)) == TILDE))
|
|
&& validate_factor(CHILD(tree, 1)))
|
|
|| ((nch == 1)
|
|
&& validate_power(CHILD(tree, 0)))));
|
|
return (res);
|
|
}
|
|
|
|
|
|
/* power:
|
|
*
|
|
* power: atom trailer* ('**' factor)*
|
|
*/
|
|
static int
|
|
validate_power(node *tree)
|
|
{
|
|
int pos = 1;
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, power) && (nch >= 1)
|
|
&& validate_atom(CHILD(tree, 0)));
|
|
|
|
while (res && (pos < nch) && (TYPE(CHILD(tree, pos)) == trailer))
|
|
res = validate_trailer(CHILD(tree, pos++));
|
|
if (res && (pos < nch)) {
|
|
if (!is_even(nch - pos)) {
|
|
err_string("illegal number of nodes for 'power'");
|
|
return (0);
|
|
}
|
|
for ( ; res && (pos < (nch - 1)); pos += 2)
|
|
res = (validate_doublestar(CHILD(tree, pos))
|
|
&& validate_factor(CHILD(tree, pos + 1)));
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
static int
|
|
validate_atom(node *tree)
|
|
{
|
|
int pos;
|
|
int nch = NCH(tree);
|
|
int res = validate_ntype(tree, atom);
|
|
|
|
if (res && nch < 1)
|
|
res = validate_numnodes(tree, nch+1, "atom");
|
|
if (res) {
|
|
switch (TYPE(CHILD(tree, 0))) {
|
|
case LPAR:
|
|
res = ((nch <= 3)
|
|
&& (validate_rparen(CHILD(tree, nch - 1))));
|
|
|
|
if (res && (nch == 3)) {
|
|
if (TYPE(CHILD(tree, 1))==yield_expr)
|
|
res = validate_yield_expr(CHILD(tree, 1));
|
|
else
|
|
res = validate_testlist_comp(CHILD(tree, 1));
|
|
}
|
|
break;
|
|
case LSQB:
|
|
if (nch == 2)
|
|
res = validate_ntype(CHILD(tree, 1), RSQB);
|
|
else if (nch == 3)
|
|
res = (validate_testlist_comp(CHILD(tree, 1))
|
|
&& validate_ntype(CHILD(tree, 2), RSQB));
|
|
else {
|
|
res = 0;
|
|
err_string("illegal list display atom");
|
|
}
|
|
break;
|
|
case LBRACE:
|
|
res = ((nch <= 3)
|
|
&& validate_ntype(CHILD(tree, nch - 1), RBRACE));
|
|
|
|
if (res && (nch == 3))
|
|
res = validate_dictorsetmaker(CHILD(tree, 1));
|
|
break;
|
|
case NAME:
|
|
case NUMBER:
|
|
res = (nch == 1);
|
|
break;
|
|
case STRING:
|
|
for (pos = 1; res && (pos < nch); ++pos)
|
|
res = validate_ntype(CHILD(tree, pos), STRING);
|
|
break;
|
|
case DOT:
|
|
res = (nch == 3 &&
|
|
validate_ntype(CHILD(tree, 1), DOT) &&
|
|
validate_ntype(CHILD(tree, 2), DOT));
|
|
break;
|
|
default:
|
|
res = 0;
|
|
break;
|
|
}
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
/* testlist_comp:
|
|
* test ( comp_for | (',' test)* [','] )
|
|
*/
|
|
static int
|
|
validate_testlist_comp(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int ok = nch;
|
|
|
|
if (nch == 0)
|
|
err_string("missing child nodes of testlist_comp");
|
|
else {
|
|
ok = validate_test(CHILD(tree, 0));
|
|
}
|
|
|
|
/*
|
|
* comp_for | (',' test)* [',']
|
|
*/
|
|
if (nch == 2 && TYPE(CHILD(tree, 1)) == comp_for)
|
|
ok = validate_comp_for(CHILD(tree, 1));
|
|
else {
|
|
/* (',' test)* [','] */
|
|
int i = 1;
|
|
while (ok && nch - i >= 2) {
|
|
ok = (validate_comma(CHILD(tree, i))
|
|
&& validate_test(CHILD(tree, i+1)));
|
|
i += 2;
|
|
}
|
|
if (ok && i == nch-1)
|
|
ok = validate_comma(CHILD(tree, i));
|
|
else if (i != nch) {
|
|
ok = 0;
|
|
err_string("illegal trailing nodes for testlist_comp");
|
|
}
|
|
}
|
|
return ok;
|
|
}
|
|
|
|
/* decorator:
|
|
* '@' dotted_name [ '(' [arglist] ')' ] NEWLINE
|
|
*/
|
|
static int
|
|
validate_decorator(node *tree)
|
|
{
|
|
int ok;
|
|
int nch = NCH(tree);
|
|
ok = (validate_ntype(tree, decorator) &&
|
|
(nch == 3 || nch == 5 || nch == 6) &&
|
|
validate_at(CHILD(tree, 0)) &&
|
|
validate_dotted_name(CHILD(tree, 1)) &&
|
|
validate_newline(RCHILD(tree, -1)));
|
|
|
|
if (ok && nch != 3) {
|
|
ok = (validate_lparen(CHILD(tree, 2)) &&
|
|
validate_rparen(RCHILD(tree, -2)));
|
|
|
|
if (ok && nch == 6)
|
|
ok = validate_arglist(CHILD(tree, 3));
|
|
}
|
|
|
|
return ok;
|
|
}
|
|
|
|
/* decorators:
|
|
* decorator+
|
|
*/
|
|
static int
|
|
validate_decorators(node *tree)
|
|
{
|
|
int i, nch, ok;
|
|
nch = NCH(tree);
|
|
ok = validate_ntype(tree, decorators) && nch >= 1;
|
|
|
|
for (i = 0; ok && i < nch; ++i)
|
|
ok = validate_decorator(CHILD(tree, i));
|
|
|
|
return ok;
|
|
}
|
|
|
|
/* with_var
|
|
with_var: 'as' expr
|
|
*/
|
|
static int
|
|
validate_with_var(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int ok = (validate_ntype(tree, with_var)
|
|
&& (nch == 2)
|
|
&& validate_name(CHILD(tree, 0), "as")
|
|
&& validate_expr(CHILD(tree, 1)));
|
|
return ok;
|
|
}
|
|
|
|
/* with_stmt
|
|
* 0 1 2 -2 -1
|
|
with_stmt: 'with' test [ with_var ] ':' suite
|
|
*/
|
|
static int
|
|
validate_with_stmt(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int ok = (validate_ntype(tree, with_stmt)
|
|
&& ((nch == 4) || (nch == 5))
|
|
&& validate_name(CHILD(tree, 0), "with")
|
|
&& validate_test(CHILD(tree, 1))
|
|
&& (nch == 4 || validate_with_var(CHILD(tree, 2)))
|
|
&& validate_colon(RCHILD(tree, -2))
|
|
&& validate_suite(RCHILD(tree, -1)));
|
|
return ok;
|
|
}
|
|
|
|
/* funcdef:
|
|
*
|
|
* -5 -4 -3 -2 -1
|
|
* 'def' NAME parameters ':' suite
|
|
*/
|
|
static int
|
|
validate_funcdef(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int ok = (validate_ntype(tree, funcdef)
|
|
&& (nch == 5)
|
|
&& validate_name(RCHILD(tree, -5), "def")
|
|
&& validate_ntype(RCHILD(tree, -4), NAME)
|
|
&& validate_colon(RCHILD(tree, -2))
|
|
&& validate_parameters(RCHILD(tree, -3))
|
|
&& validate_suite(RCHILD(tree, -1)));
|
|
return ok;
|
|
}
|
|
|
|
|
|
/* decorated
|
|
* decorators (classdef | funcdef)
|
|
*/
|
|
static int
|
|
validate_decorated(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int ok = (validate_ntype(tree, decorated)
|
|
&& (nch == 2)
|
|
&& validate_decorators(RCHILD(tree, -2))
|
|
&& (validate_funcdef(RCHILD(tree, -1))
|
|
|| validate_class(RCHILD(tree, -1)))
|
|
);
|
|
return ok;
|
|
}
|
|
|
|
static int
|
|
validate_lambdef(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, lambdef)
|
|
&& ((nch == 3) || (nch == 4))
|
|
&& validate_name(CHILD(tree, 0), "lambda")
|
|
&& validate_colon(CHILD(tree, nch - 2))
|
|
&& validate_test(CHILD(tree, nch - 1)));
|
|
|
|
if (res && (nch == 4))
|
|
res = validate_varargslist(CHILD(tree, 1));
|
|
else if (!res && !PyErr_Occurred())
|
|
(void) validate_numnodes(tree, 3, "lambdef");
|
|
|
|
return (res);
|
|
}
|
|
|
|
|
|
static int
|
|
validate_lambdef_nocond(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, lambdef_nocond)
|
|
&& ((nch == 3) || (nch == 4))
|
|
&& validate_name(CHILD(tree, 0), "lambda")
|
|
&& validate_colon(CHILD(tree, nch - 2))
|
|
&& validate_test(CHILD(tree, nch - 1)));
|
|
|
|
if (res && (nch == 4))
|
|
res = validate_varargslist(CHILD(tree, 1));
|
|
else if (!res && !PyErr_Occurred())
|
|
(void) validate_numnodes(tree, 3, "lambdef_nocond");
|
|
|
|
return (res);
|
|
}
|
|
|
|
|
|
/* arglist:
|
|
*
|
|
* (argument ',')* (argument [','] | '*' test [',' '**' test] | '**' test)
|
|
*/
|
|
static int
|
|
validate_arglist(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int i = 0;
|
|
int ok = 1;
|
|
|
|
if (nch <= 0)
|
|
/* raise the right error from having an invalid number of children */
|
|
return validate_numnodes(tree, nch + 1, "arglist");
|
|
|
|
if (nch > 1) {
|
|
for (i=0; i<nch; i++) {
|
|
if (TYPE(CHILD(tree, i)) == argument) {
|
|
node *ch = CHILD(tree, i);
|
|
if (NCH(ch) == 2 && TYPE(CHILD(ch, 1)) == comp_for) {
|
|
err_string("need '(', ')' for generator expression");
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
while (ok && nch-i >= 2) {
|
|
/* skip leading (argument ',') */
|
|
ok = (validate_argument(CHILD(tree, i))
|
|
&& validate_comma(CHILD(tree, i+1)));
|
|
if (ok)
|
|
i += 2;
|
|
else
|
|
PyErr_Clear();
|
|
}
|
|
ok = 1;
|
|
if (nch-i > 0) {
|
|
/*
|
|
* argument | '*' test [',' '**' test] | '**' test
|
|
*/
|
|
int sym = TYPE(CHILD(tree, i));
|
|
|
|
if (sym == argument) {
|
|
ok = validate_argument(CHILD(tree, i));
|
|
if (ok && i+1 != nch) {
|
|
err_string("illegal arglist specification"
|
|
" (extra stuff on end)");
|
|
ok = 0;
|
|
}
|
|
}
|
|
else if (sym == STAR) {
|
|
ok = validate_star(CHILD(tree, i));
|
|
if (ok && (nch-i == 2))
|
|
ok = validate_test(CHILD(tree, i+1));
|
|
else if (ok && (nch-i == 5))
|
|
ok = (validate_test(CHILD(tree, i+1))
|
|
&& validate_comma(CHILD(tree, i+2))
|
|
&& validate_doublestar(CHILD(tree, i+3))
|
|
&& validate_test(CHILD(tree, i+4)));
|
|
else {
|
|
err_string("illegal use of '*' in arglist");
|
|
ok = 0;
|
|
}
|
|
}
|
|
else if (sym == DOUBLESTAR) {
|
|
if (nch-i == 2)
|
|
ok = (validate_doublestar(CHILD(tree, i))
|
|
&& validate_test(CHILD(tree, i+1)));
|
|
else {
|
|
err_string("illegal use of '**' in arglist");
|
|
ok = 0;
|
|
}
|
|
}
|
|
else {
|
|
err_string("illegal arglist specification");
|
|
ok = 0;
|
|
}
|
|
}
|
|
return (ok);
|
|
}
|
|
|
|
|
|
|
|
/* argument:
|
|
*
|
|
* [test '='] test [comp_for]
|
|
*/
|
|
static int
|
|
validate_argument(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, argument)
|
|
&& ((nch == 1) || (nch == 2) || (nch == 3))
|
|
&& validate_test(CHILD(tree, 0)));
|
|
|
|
if (res && (nch == 2))
|
|
res = validate_comp_for(CHILD(tree, 1));
|
|
else if (res && (nch == 3))
|
|
res = (validate_equal(CHILD(tree, 1))
|
|
&& validate_test(CHILD(tree, 2)));
|
|
|
|
return (res);
|
|
}
|
|
|
|
|
|
|
|
/* trailer:
|
|
*
|
|
* '(' [arglist] ')' | '[' subscriptlist ']' | '.' NAME
|
|
*/
|
|
static int
|
|
validate_trailer(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = validate_ntype(tree, trailer) && ((nch == 2) || (nch == 3));
|
|
|
|
if (res) {
|
|
switch (TYPE(CHILD(tree, 0))) {
|
|
case LPAR:
|
|
res = validate_rparen(CHILD(tree, nch - 1));
|
|
if (res && (nch == 3))
|
|
res = validate_arglist(CHILD(tree, 1));
|
|
break;
|
|
case LSQB:
|
|
res = (validate_numnodes(tree, 3, "trailer")
|
|
&& validate_subscriptlist(CHILD(tree, 1))
|
|
&& validate_ntype(CHILD(tree, 2), RSQB));
|
|
break;
|
|
case DOT:
|
|
res = (validate_numnodes(tree, 2, "trailer")
|
|
&& validate_ntype(CHILD(tree, 1), NAME));
|
|
break;
|
|
default:
|
|
res = 0;
|
|
break;
|
|
}
|
|
}
|
|
else {
|
|
(void) validate_numnodes(tree, 2, "trailer");
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
/* subscriptlist:
|
|
*
|
|
* subscript (',' subscript)* [',']
|
|
*/
|
|
static int
|
|
validate_subscriptlist(node *tree)
|
|
{
|
|
return (validate_repeating_list(tree, subscriptlist,
|
|
validate_subscript, "subscriptlist"));
|
|
}
|
|
|
|
|
|
/* subscript:
|
|
*
|
|
* '.' '.' '.' | test | [test] ':' [test] [sliceop]
|
|
*/
|
|
static int
|
|
validate_subscript(node *tree)
|
|
{
|
|
int offset = 0;
|
|
int nch = NCH(tree);
|
|
int res = validate_ntype(tree, subscript) && (nch >= 1) && (nch <= 4);
|
|
|
|
if (!res) {
|
|
if (!PyErr_Occurred())
|
|
err_string("invalid number of arguments for subscript node");
|
|
return (0);
|
|
}
|
|
if (TYPE(CHILD(tree, 0)) == DOT)
|
|
/* take care of ('.' '.' '.') possibility */
|
|
return (validate_numnodes(tree, 3, "subscript")
|
|
&& validate_dot(CHILD(tree, 0))
|
|
&& validate_dot(CHILD(tree, 1))
|
|
&& validate_dot(CHILD(tree, 2)));
|
|
if (nch == 1) {
|
|
if (TYPE(CHILD(tree, 0)) == test)
|
|
res = validate_test(CHILD(tree, 0));
|
|
else
|
|
res = validate_colon(CHILD(tree, 0));
|
|
return (res);
|
|
}
|
|
/* Must be [test] ':' [test] [sliceop],
|
|
* but at least one of the optional components will
|
|
* be present, but we don't know which yet.
|
|
*/
|
|
if ((TYPE(CHILD(tree, 0)) != COLON) || (nch == 4)) {
|
|
res = validate_test(CHILD(tree, 0));
|
|
offset = 1;
|
|
}
|
|
if (res)
|
|
res = validate_colon(CHILD(tree, offset));
|
|
if (res) {
|
|
int rem = nch - ++offset;
|
|
if (rem) {
|
|
if (TYPE(CHILD(tree, offset)) == test) {
|
|
res = validate_test(CHILD(tree, offset));
|
|
++offset;
|
|
--rem;
|
|
}
|
|
if (res && rem)
|
|
res = validate_sliceop(CHILD(tree, offset));
|
|
}
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
static int
|
|
validate_sliceop(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = ((nch == 1) || validate_numnodes(tree, 2, "sliceop"))
|
|
&& validate_ntype(tree, sliceop);
|
|
if (!res && !PyErr_Occurred()) {
|
|
res = validate_numnodes(tree, 1, "sliceop");
|
|
}
|
|
if (res)
|
|
res = validate_colon(CHILD(tree, 0));
|
|
if (res && (nch == 2))
|
|
res = validate_test(CHILD(tree, 1));
|
|
|
|
return (res);
|
|
}
|
|
|
|
|
|
static int
|
|
validate_exprlist(node *tree)
|
|
{
|
|
return (validate_repeating_list(tree, exprlist,
|
|
validate_star_expr, "exprlist"));
|
|
}
|
|
|
|
|
|
static int
|
|
validate_dictorsetmaker(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, dictorsetmaker)
|
|
&& (nch >= 3)
|
|
&& validate_test(CHILD(tree, 0))
|
|
&& validate_colon(CHILD(tree, 1))
|
|
&& validate_test(CHILD(tree, 2)));
|
|
|
|
if (res && ((nch % 4) == 0))
|
|
res = validate_comma(CHILD(tree, --nch));
|
|
else if (res)
|
|
res = ((nch % 4) == 3);
|
|
|
|
if (res && (nch > 3)) {
|
|
int pos = 3;
|
|
/* ( ',' test ':' test )* */
|
|
while (res && (pos < nch)) {
|
|
res = (validate_comma(CHILD(tree, pos))
|
|
&& validate_test(CHILD(tree, pos + 1))
|
|
&& validate_colon(CHILD(tree, pos + 2))
|
|
&& validate_test(CHILD(tree, pos + 3)));
|
|
pos += 4;
|
|
}
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
static int
|
|
validate_eval_input(node *tree)
|
|
{
|
|
int pos;
|
|
int nch = NCH(tree);
|
|
int res = (validate_ntype(tree, eval_input)
|
|
&& (nch >= 2)
|
|
&& validate_testlist(CHILD(tree, 0))
|
|
&& validate_ntype(CHILD(tree, nch - 1), ENDMARKER));
|
|
|
|
for (pos = 1; res && (pos < (nch - 1)); ++pos)
|
|
res = validate_ntype(CHILD(tree, pos), NEWLINE);
|
|
|
|
return (res);
|
|
}
|
|
|
|
|
|
static int
|
|
validate_node(node *tree)
|
|
{
|
|
int nch = 0; /* num. children on current node */
|
|
int res = 1; /* result value */
|
|
node* next = 0; /* node to process after this one */
|
|
|
|
while (res && (tree != 0)) {
|
|
nch = NCH(tree);
|
|
next = 0;
|
|
switch (TYPE(tree)) {
|
|
/*
|
|
* Definition nodes.
|
|
*/
|
|
case funcdef:
|
|
res = validate_funcdef(tree);
|
|
break;
|
|
case with_stmt:
|
|
res = validate_with_stmt(tree);
|
|
break;
|
|
case classdef:
|
|
res = validate_class(tree);
|
|
break;
|
|
case decorated:
|
|
res = validate_decorated(tree);
|
|
break;
|
|
/*
|
|
* "Trivial" parse tree nodes.
|
|
* (Why did I call these trivial?)
|
|
*/
|
|
case stmt:
|
|
res = validate_stmt(tree);
|
|
break;
|
|
case small_stmt:
|
|
/*
|
|
* expr_stmt | del_stmt | pass_stmt | flow_stmt
|
|
* | import_stmt | global_stmt | assert_stmt
|
|
*/
|
|
res = validate_small_stmt(tree);
|
|
break;
|
|
case flow_stmt:
|
|
res = (validate_numnodes(tree, 1, "flow_stmt")
|
|
&& ((TYPE(CHILD(tree, 0)) == break_stmt)
|
|
|| (TYPE(CHILD(tree, 0)) == continue_stmt)
|
|
|| (TYPE(CHILD(tree, 0)) == yield_stmt)
|
|
|| (TYPE(CHILD(tree, 0)) == return_stmt)
|
|
|| (TYPE(CHILD(tree, 0)) == raise_stmt)));
|
|
if (res)
|
|
next = CHILD(tree, 0);
|
|
else if (nch == 1)
|
|
err_string("illegal flow_stmt type");
|
|
break;
|
|
case yield_stmt:
|
|
res = validate_yield_stmt(tree);
|
|
break;
|
|
/*
|
|
* Compound statements.
|
|
*/
|
|
case simple_stmt:
|
|
res = validate_simple_stmt(tree);
|
|
break;
|
|
case compound_stmt:
|
|
res = validate_compound_stmt(tree);
|
|
break;
|
|
/*
|
|
* Fundamental statements.
|
|
*/
|
|
case expr_stmt:
|
|
res = validate_expr_stmt(tree);
|
|
break;
|
|
case del_stmt:
|
|
res = validate_del_stmt(tree);
|
|
break;
|
|
case pass_stmt:
|
|
res = (validate_numnodes(tree, 1, "pass")
|
|
&& validate_name(CHILD(tree, 0), "pass"));
|
|
break;
|
|
case break_stmt:
|
|
res = (validate_numnodes(tree, 1, "break")
|
|
&& validate_name(CHILD(tree, 0), "break"));
|
|
break;
|
|
case continue_stmt:
|
|
res = (validate_numnodes(tree, 1, "continue")
|
|
&& validate_name(CHILD(tree, 0), "continue"));
|
|
break;
|
|
case return_stmt:
|
|
res = validate_return_stmt(tree);
|
|
break;
|
|
case raise_stmt:
|
|
res = validate_raise_stmt(tree);
|
|
break;
|
|
case import_stmt:
|
|
res = validate_import_stmt(tree);
|
|
break;
|
|
case import_name:
|
|
res = validate_import_name(tree);
|
|
break;
|
|
case import_from:
|
|
res = validate_import_from(tree);
|
|
break;
|
|
case global_stmt:
|
|
res = validate_global_stmt(tree);
|
|
break;
|
|
case assert_stmt:
|
|
res = validate_assert_stmt(tree);
|
|
break;
|
|
case if_stmt:
|
|
res = validate_if(tree);
|
|
break;
|
|
case while_stmt:
|
|
res = validate_while(tree);
|
|
break;
|
|
case for_stmt:
|
|
res = validate_for(tree);
|
|
break;
|
|
case try_stmt:
|
|
res = validate_try(tree);
|
|
break;
|
|
case suite:
|
|
res = validate_suite(tree);
|
|
break;
|
|
/*
|
|
* Expression nodes.
|
|
*/
|
|
case testlist:
|
|
res = validate_testlist(tree);
|
|
break;
|
|
case yield_expr:
|
|
res = validate_yield_expr(tree);
|
|
break;
|
|
case testlist1:
|
|
res = validate_testlist1(tree);
|
|
break;
|
|
case test:
|
|
res = validate_test(tree);
|
|
break;
|
|
case and_test:
|
|
res = validate_and_test(tree);
|
|
break;
|
|
case not_test:
|
|
res = validate_not_test(tree);
|
|
break;
|
|
case comparison:
|
|
res = validate_comparison(tree);
|
|
break;
|
|
case exprlist:
|
|
res = validate_exprlist(tree);
|
|
break;
|
|
case comp_op:
|
|
res = validate_comp_op(tree);
|
|
break;
|
|
case expr:
|
|
res = validate_expr(tree);
|
|
break;
|
|
case xor_expr:
|
|
res = validate_xor_expr(tree);
|
|
break;
|
|
case and_expr:
|
|
res = validate_and_expr(tree);
|
|
break;
|
|
case shift_expr:
|
|
res = validate_shift_expr(tree);
|
|
break;
|
|
case arith_expr:
|
|
res = validate_arith_expr(tree);
|
|
break;
|
|
case term:
|
|
res = validate_term(tree);
|
|
break;
|
|
case factor:
|
|
res = validate_factor(tree);
|
|
break;
|
|
case power:
|
|
res = validate_power(tree);
|
|
break;
|
|
case atom:
|
|
res = validate_atom(tree);
|
|
break;
|
|
|
|
default:
|
|
/* Hopefully never reached! */
|
|
err_string("unrecognized node type");
|
|
res = 0;
|
|
break;
|
|
}
|
|
tree = next;
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
static int
|
|
validate_expr_tree(node *tree)
|
|
{
|
|
int res = validate_eval_input(tree);
|
|
|
|
if (!res && !PyErr_Occurred())
|
|
err_string("could not validate expression tuple");
|
|
|
|
return (res);
|
|
}
|
|
|
|
|
|
/* file_input:
|
|
* (NEWLINE | stmt)* ENDMARKER
|
|
*/
|
|
static int
|
|
validate_file_input(node *tree)
|
|
{
|
|
int j;
|
|
int nch = NCH(tree) - 1;
|
|
int res = ((nch >= 0)
|
|
&& validate_ntype(CHILD(tree, nch), ENDMARKER));
|
|
|
|
for (j = 0; res && (j < nch); ++j) {
|
|
if (TYPE(CHILD(tree, j)) == stmt)
|
|
res = validate_stmt(CHILD(tree, j));
|
|
else
|
|
res = validate_newline(CHILD(tree, j));
|
|
}
|
|
/* This stays in to prevent any internal failures from getting to the
|
|
* user. Hopefully, this won't be needed. If a user reports getting
|
|
* this, we have some debugging to do.
|
|
*/
|
|
if (!res && !PyErr_Occurred())
|
|
err_string("VALIDATION FAILURE: report this to the maintainer!");
|
|
|
|
return (res);
|
|
}
|
|
|
|
static int
|
|
validate_encoding_decl(node *tree)
|
|
{
|
|
int nch = NCH(tree);
|
|
int res = ((nch == 1)
|
|
&& validate_file_input(CHILD(tree, 0)));
|
|
|
|
if (!res && !PyErr_Occurred())
|
|
err_string("Error Parsing encoding_decl");
|
|
|
|
return res;
|
|
}
|
|
|
|
static PyObject*
|
|
pickle_constructor = NULL;
|
|
|
|
|
|
static PyObject*
|
|
parser__pickler(PyObject *self, PyObject *args)
|
|
{
|
|
NOTE(ARGUNUSED(self))
|
|
PyObject *result = NULL;
|
|
PyObject *st = NULL;
|
|
PyObject *empty_dict = NULL;
|
|
|
|
if (PyArg_ParseTuple(args, "O!:_pickler", &PyST_Type, &st)) {
|
|
PyObject *newargs;
|
|
PyObject *tuple;
|
|
|
|
if ((empty_dict = PyDict_New()) == NULL)
|
|
goto finally;
|
|
if ((newargs = Py_BuildValue("Oi", st, 1)) == NULL)
|
|
goto finally;
|
|
tuple = parser_st2tuple((PyST_Object*)NULL, newargs, empty_dict);
|
|
if (tuple != NULL) {
|
|
result = Py_BuildValue("O(O)", pickle_constructor, tuple);
|
|
Py_DECREF(tuple);
|
|
}
|
|
Py_DECREF(empty_dict);
|
|
Py_DECREF(newargs);
|
|
}
|
|
finally:
|
|
Py_XDECREF(empty_dict);
|
|
|
|
return (result);
|
|
}
|
|
|
|
|
|
/* Functions exported by this module. Most of this should probably
|
|
* be converted into an ST object with methods, but that is better
|
|
* done directly in Python, allowing subclasses to be created directly.
|
|
* We'd really have to write a wrapper around it all anyway to allow
|
|
* inheritance.
|
|
*/
|
|
static PyMethodDef parser_functions[] = {
|
|
{"compilest", (PyCFunction)parser_compilest, PUBLIC_METHOD_TYPE,
|
|
PyDoc_STR("Compiles an ST object into a code object.")},
|
|
{"expr", (PyCFunction)parser_expr, PUBLIC_METHOD_TYPE,
|
|
PyDoc_STR("Creates an ST object from an expression.")},
|
|
{"isexpr", (PyCFunction)parser_isexpr, PUBLIC_METHOD_TYPE,
|
|
PyDoc_STR("Determines if an ST object was created from an expression.")},
|
|
{"issuite", (PyCFunction)parser_issuite, PUBLIC_METHOD_TYPE,
|
|
PyDoc_STR("Determines if an ST object was created from a suite.")},
|
|
{"suite", (PyCFunction)parser_suite, PUBLIC_METHOD_TYPE,
|
|
PyDoc_STR("Creates an ST object from a suite.")},
|
|
{"sequence2st", (PyCFunction)parser_tuple2st, PUBLIC_METHOD_TYPE,
|
|
PyDoc_STR("Creates an ST object from a tree representation.")},
|
|
{"st2tuple", (PyCFunction)parser_st2tuple, PUBLIC_METHOD_TYPE,
|
|
PyDoc_STR("Creates a tuple-tree representation of an ST.")},
|
|
{"st2list", (PyCFunction)parser_st2list, PUBLIC_METHOD_TYPE,
|
|
PyDoc_STR("Creates a list-tree representation of an ST.")},
|
|
{"tuple2st", (PyCFunction)parser_tuple2st, PUBLIC_METHOD_TYPE,
|
|
PyDoc_STR("Creates an ST object from a tree representation.")},
|
|
|
|
/* private stuff: support pickle module */
|
|
{"_pickler", (PyCFunction)parser__pickler, METH_VARARGS,
|
|
PyDoc_STR("Returns the pickle magic to allow ST objects to be pickled.")},
|
|
|
|
{NULL, NULL, 0, NULL}
|
|
};
|
|
|
|
|
|
|
|
static struct PyModuleDef parsermodule = {
|
|
PyModuleDef_HEAD_INIT,
|
|
"parser",
|
|
NULL,
|
|
-1,
|
|
parser_functions,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL
|
|
};
|
|
|
|
PyMODINIT_FUNC PyInit_parser(void); /* supply a prototype */
|
|
|
|
PyMODINIT_FUNC
|
|
PyInit_parser(void)
|
|
{
|
|
PyObject *module, *copyreg;
|
|
|
|
if (PyType_Ready(&PyST_Type) < 0)
|
|
return NULL;
|
|
module = PyModule_Create(&parsermodule);
|
|
if (module == NULL)
|
|
return NULL;
|
|
|
|
if (parser_error == 0)
|
|
parser_error = PyErr_NewException("parser.ParserError", NULL, NULL);
|
|
|
|
if (parser_error == 0)
|
|
return NULL;
|
|
/* CAUTION: The code next used to skip bumping the refcount on
|
|
* parser_error. That's a disaster if PyInit_parser() gets called more
|
|
* than once. By incref'ing, we ensure that each module dict that
|
|
* gets created owns its reference to the shared parser_error object,
|
|
* and the file static parser_error vrbl owns a reference too.
|
|
*/
|
|
Py_INCREF(parser_error);
|
|
if (PyModule_AddObject(module, "ParserError", parser_error) != 0)
|
|
return NULL;
|
|
|
|
Py_INCREF(&PyST_Type);
|
|
PyModule_AddObject(module, "STType", (PyObject*)&PyST_Type);
|
|
|
|
PyModule_AddStringConstant(module, "__copyright__",
|
|
parser_copyright_string);
|
|
PyModule_AddStringConstant(module, "__doc__",
|
|
parser_doc_string);
|
|
PyModule_AddStringConstant(module, "__version__",
|
|
parser_version_string);
|
|
|
|
/* Register to support pickling.
|
|
* If this fails, the import of this module will fail because an
|
|
* exception will be raised here; should we clear the exception?
|
|
*/
|
|
copyreg = PyImport_ImportModuleNoBlock("copyreg");
|
|
if (copyreg != NULL) {
|
|
PyObject *func, *pickler;
|
|
|
|
func = PyObject_GetAttrString(copyreg, "pickle");
|
|
pickle_constructor = PyObject_GetAttrString(module, "sequence2st");
|
|
pickler = PyObject_GetAttrString(module, "_pickler");
|
|
Py_XINCREF(pickle_constructor);
|
|
if ((func != NULL) && (pickle_constructor != NULL)
|
|
&& (pickler != NULL)) {
|
|
PyObject *res;
|
|
|
|
res = PyObject_CallFunctionObjArgs(func, &PyST_Type, pickler,
|
|
pickle_constructor, NULL);
|
|
Py_XDECREF(res);
|
|
}
|
|
Py_XDECREF(func);
|
|
Py_XDECREF(pickle_constructor);
|
|
Py_XDECREF(pickler);
|
|
Py_DECREF(copyreg);
|
|
}
|
|
return module;
|
|
}
|