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File Name : _ast_gen.py

#-----------------------------------------------------------------
# _ast_gen.py
#
# Generates the AST Node classes from a specification given in
# a configuration file
#
# The design of this module was inspired by astgen.py from the
# Python 2.5 code-base.
#
# Eli Bendersky [https://eli.thegreenplace.net/]
# License: BSD
#-----------------------------------------------------------------
from string import Template

class ASTCodeGenerator(object):
    def __init__(self, cfg_filename='_c_ast.cfg'):
        """ Initialize the code generator from a configuration
            file.
        """
        self.cfg_filename = cfg_filename
        self.node_cfg = [NodeCfg(name, contents)
            for (name, contents) in self.parse_cfgfile(cfg_filename)]

def generate(self, file=None):
        """ Generates the code into file, an open file buffer.
        """
        src = Template(_PROLOGUE_COMMENT).substitute(
            cfg_filename=self.cfg_filename)

src += _PROLOGUE_CODE
        for node_cfg in self.node_cfg:
            src += node_cfg.generate_source() + '\n\n'

file.write(src)

def parse_cfgfile(self, filename):
        """ Parse the configuration file and yield pairs of
            (name, contents) for each node.
        """
        with open(filename, "r") as f:
            for line in f:
                line = line.strip()
                if not line or line.startswith('#'):
                    continue
                colon_i = line.find(':')
                lbracket_i = line.find('[')
                rbracket_i = line.find(']')
                if colon_i < 1 or lbracket_i <= colon_i or rbracket_i <= lbracket_i:
                    raise RuntimeError("Invalid line in %s:\n%s\n" % (filename, line))

name = line[:colon_i]
                val = line[lbracket_i + 1:rbracket_i]
                vallist = [v.strip() for v in val.split(',')] if val else []
                yield name, vallist

class NodeCfg(object):
    """ Node configuration.

name: node name
        contents: a list of contents - attributes and child nodes
        See comment at the top of the configuration file for details.
    """

def __init__(self, name, contents):
        self.name = name
        self.all_entries = []
        self.attr = []
        self.child = []
        self.seq_child = []

for entry in contents:
            clean_entry = entry.rstrip('*')
            self.all_entries.append(clean_entry)

if entry.endswith('**'):
                self.seq_child.append(clean_entry)
            elif entry.endswith('*'):
                self.child.append(clean_entry)
            else:
                self.attr.append(entry)

def generate_source(self):
        src = self._gen_init()
        src += '\n' + self._gen_children()
        src += '\n' + self._gen_iter()
        src += '\n' + self._gen_attr_names()
        return src

def _gen_init(self):
        src = "class %s(Node):\n" % self.name

if self.all_entries:
            args = ', '.join(self.all_entries)
            slots = ', '.join("'{0}'".format(e) for e in self.all_entries)
            slots += ", 'coord', '__weakref__'"
            arglist = '(self, %s, coord=None)' % args
        else:
            slots = "'coord', '__weakref__'"
            arglist = '(self, coord=None)'

src += "    __slots__ = (%s)\n" % slots
        src += "    def __init__%s:\n" % arglist

for name in self.all_entries + ['coord']:
            src += "        self.%s = %s\n" % (name, name)

return src

def _gen_children(self):
        src = '    def children(self):\n'

if self.all_entries:
            src += '        nodelist = []\n'

for child in self.child:
                src += (
                    '        if self.%(child)s is not None:' +
                    ' nodelist.append(("%(child)s", self.%(child)s))\n') % (
                        dict(child=child))

for seq_child in self.seq_child:
                src += (
                    '        for i, child in enumerate(self.%(child)s or []):\n'
                    '            nodelist.append(("%(child)s[%%d]" %% i, child))\n') % (
                        dict(child=seq_child))

src += '        return tuple(nodelist)\n'
        else:
            src += '        return ()\n'

return src

def _gen_iter(self):
        src = '    def __iter__(self):\n'

if self.all_entries:
            for child in self.child:
                src += (
                    '        if self.%(child)s is not None:\n' +
                    '            yield self.%(child)s\n') % (dict(child=child))

for seq_child in self.seq_child:
                src += (
                    '        for child in (self.%(child)s or []):\n'
                    '            yield child\n') % (dict(child=seq_child))

if not (self.child or self.seq_child):
                # Empty generator
                src += (
                    '        return\n' +
                    '        yield\n')
        else:
            # Empty generator
            src += (
                '        return\n' +
                '        yield\n')

return src

def _gen_attr_names(self):
        src = "    attr_names = (" + ''.join("%r, " % nm for nm in self.attr) + ')'
        return src

_PROLOGUE_COMMENT = \
r'''#-----------------------------------------------------------------
# ** ATTENTION **
# This code was automatically generated from the file:
# $cfg_filename
#
# Do not modify it directly. Modify the configuration file and
# run the generator again.
# ** ** *** ** **
#
# pycparser: c_ast.py
#
# AST Node classes.
#
# Eli Bendersky [https://eli.thegreenplace.net/]
# License: BSD
#-----------------------------------------------------------------

'''

_PROLOGUE_CODE = r'''
import sys

def _repr(obj):
    """
    Get the representation of an object, with dedicated pprint-like format for lists.
    """
    if isinstance(obj, list):
        return '[' + (',\n '.join((_repr(e).replace('\n', '\n ') for e in obj))) + '\n]'
    else:
        return repr(obj)

class Node(object):
    __slots__ = ()
    """ Abstract base class for AST nodes.
    """
    def __repr__(self):
        """ Generates a python representation of the current node
        """
        result = self.__class__.__name__ + '('

indent = ''
        separator = ''
        for name in self.__slots__[:-2]:
            result += separator
            result += indent
            result += name + '=' + (_repr(getattr(self, name)).replace('\n', '\n  ' + (' ' * (len(name) + len(self.__class__.__name__)))))

separator = ','
            indent = '\n ' + (' ' * len(self.__class__.__name__))

result += indent + ')'

return result

def children(self):
        """ A sequence of all children that are Nodes
        """
        pass

def show(self, buf=sys.stdout, offset=0, attrnames=False, nodenames=False, showcoord=False, _my_node_name=None):
        """ Pretty print the Node and all its attributes and
            children (recursively) to a buffer.

buf:
                Open IO buffer into which the Node is printed.

offset:
                Initial offset (amount of leading spaces)

attrnames:
                True if you want to see the attribute names in
                name=value pairs. False to only see the values.

nodenames:
                True if you want to see the actual node names
                within their parents.

showcoord:
                Do you want the coordinates of each Node to be
                displayed.
        """
        lead = ' ' * offset
        if nodenames and _my_node_name is not None:
            buf.write(lead + self.__class__.__name__+ ' <' + _my_node_name + '>: ')
        else:
            buf.write(lead + self.__class__.__name__+ ': ')

if self.attr_names:
            if attrnames:
                nvlist = [(n, getattr(self,n)) for n in self.attr_names]
                attrstr = ', '.join('%s=%s' % nv for nv in nvlist)
            else:
                vlist = [getattr(self, n) for n in self.attr_names]
                attrstr = ', '.join('%s' % v for v in vlist)
            buf.write(attrstr)

if showcoord:
            buf.write(' (at %s)' % self.coord)
        buf.write('\n')

for (child_name, child) in self.children():
            child.show(
                buf,
                offset=offset + 2,
                attrnames=attrnames,
                nodenames=nodenames,
                showcoord=showcoord,
                _my_node_name=child_name)

class NodeVisitor(object):
    """ A base NodeVisitor class for visiting c_ast nodes.
        Subclass it and define your own visit_XXX methods, where
        XXX is the class name you want to visit with these
        methods.

For example:

class ConstantVisitor(NodeVisitor):
            def __init__(self):
                self.values = []

def visit_Constant(self, node):
                self.values.append(node.value)

Creates a list of values of all the constant nodes
        encountered below the given node. To use it:

cv = ConstantVisitor()
        cv.visit(node)

Notes:

*   generic_visit() will be called for AST nodes for which
            no visit_XXX method was defined.
        *   The children of nodes for which a visit_XXX was
            defined will not be visited - if you need this, call
            generic_visit() on the node.
            You can use:
                NodeVisitor.generic_visit(self, node)
        *   Modeled after Python's own AST visiting facilities
            (the ast module of Python 3.0)
    """

_method_cache = None

def visit(self, node):
        """ Visit a node.
        """

if self._method_cache is None:
            self._method_cache = {}

visitor = self._method_cache.get(node.__class__.__name__, None)
        if visitor is None:
            method = 'visit_' + node.__class__.__name__
            visitor = getattr(self, method, self.generic_visit)
            self._method_cache[node.__class__.__name__] = visitor

return visitor(node)

def generic_visit(self, node):
        """ Called if no explicit visitor function exists for a
            node. Implements preorder visiting of the node.
        """
        for c in node:
            self.visit(c)

'''

Name	Type	Size	Permission	Last Modified	Actions
.	dir	-	0755	2025-08-05 05:00:40
..	dir	-	0755	2025-11-10 11:07:59
__pycache__	dir	-	0755	2025-08-05 05:00:40
ply	dir	-	0755	2025-08-05 05:00:40
__init__.py	text/x-script.python	2.75 KB	0644	2025-07-04 01:31:01
_ast_gen.py	text/x-script.python	10.31 KB	0644	2025-07-04 01:31:01
_build_tables.py	text/x-script.python	1.01 KB	0644	2025-07-04 01:31:01
_c_ast.cfg	text/plain	4.16 KB	0644	2025-07-04 01:31:01
ast_transforms.py	text/x-script.python	5.56 KB	0644	2025-07-04 01:31:01
c_ast.py	text/x-script.python	30.71 KB	0644	2025-07-04 01:31:01
c_generator.py	text/x-script.python	17.36 KB	0644	2025-07-04 01:31:01
c_lexer.py	text/x-script.python	16.76 KB	0644	2025-07-04 01:31:01
c_parser.py	text/x-script.python	71.95 KB	0644	2025-07-04 01:31:01
lextab.py	text/plain	8.3 KB	0644	2025-07-04 01:31:01
plyparser.py	text/x-script.python	4.76 KB	0644	2025-07-04 01:31:01
yacctab.py	text/plain	200.83 KB	0644	2025-07-04 01:31:01