mirror of https://github.com/evilhero/mylar
534 lines
18 KiB
Python
Executable File
534 lines
18 KiB
Python
Executable File
# mako/pyparser.py
|
|
# Copyright (C) 2006-2011 the Mako authors and contributors <see AUTHORS file>
|
|
#
|
|
# This module is part of Mako and is released under
|
|
# the MIT License: http://www.opensource.org/licenses/mit-license.php
|
|
|
|
"""Handles parsing of Python code.
|
|
|
|
Parsing to AST is done via _ast on Python > 2.5, otherwise the compiler
|
|
module is used.
|
|
"""
|
|
|
|
from StringIO import StringIO
|
|
from mako import exceptions, util
|
|
import operator
|
|
|
|
if util.py3k:
|
|
# words that cannot be assigned to (notably
|
|
# smaller than the total keys in __builtins__)
|
|
reserved = set(['True', 'False', 'None', 'print'])
|
|
|
|
# the "id" attribute on a function node
|
|
arg_id = operator.attrgetter('arg')
|
|
else:
|
|
# words that cannot be assigned to (notably
|
|
# smaller than the total keys in __builtins__)
|
|
reserved = set(['True', 'False', 'None'])
|
|
|
|
# the "id" attribute on a function node
|
|
arg_id = operator.attrgetter('id')
|
|
|
|
|
|
try:
|
|
import _ast
|
|
util.restore__ast(_ast)
|
|
import _ast_util
|
|
except ImportError:
|
|
_ast = None
|
|
from compiler import parse as compiler_parse
|
|
from compiler import visitor
|
|
|
|
|
|
def parse(code, mode='exec', **exception_kwargs):
|
|
"""Parse an expression into AST"""
|
|
|
|
|
|
try:
|
|
if _ast:
|
|
return _ast_util.parse(code, '<unknown>', mode)
|
|
else:
|
|
if isinstance(code, unicode):
|
|
code = code.encode('ascii', 'backslashreplace')
|
|
return compiler_parse(code, mode)
|
|
except Exception, e:
|
|
raise exceptions.SyntaxException(
|
|
"(%s) %s (%r)" % (
|
|
e.__class__.__name__,
|
|
e,
|
|
code[0:50]
|
|
), **exception_kwargs)
|
|
|
|
|
|
if _ast:
|
|
class FindIdentifiers(_ast_util.NodeVisitor):
|
|
|
|
def __init__(self, listener, **exception_kwargs):
|
|
self.in_function = False
|
|
self.in_assign_targets = False
|
|
self.local_ident_stack = {}
|
|
self.listener = listener
|
|
self.exception_kwargs = exception_kwargs
|
|
|
|
def _add_declared(self, name):
|
|
if not self.in_function:
|
|
self.listener.declared_identifiers.add(name)
|
|
|
|
def visit_ClassDef(self, node):
|
|
self._add_declared(node.name)
|
|
|
|
def visit_Assign(self, node):
|
|
|
|
# flip around the visiting of Assign so the expression gets
|
|
# evaluated first, in the case of a clause like "x=x+5" (x
|
|
# is undeclared)
|
|
|
|
self.visit(node.value)
|
|
in_a = self.in_assign_targets
|
|
self.in_assign_targets = True
|
|
for n in node.targets:
|
|
self.visit(n)
|
|
self.in_assign_targets = in_a
|
|
|
|
if util.py3k:
|
|
|
|
# ExceptHandler is in Python 2, but this block only works in
|
|
# Python 3 (and is required there)
|
|
|
|
def visit_ExceptHandler(self, node):
|
|
if node.name is not None:
|
|
self._add_declared(node.name)
|
|
if node.type is not None:
|
|
self.listener.undeclared_identifiers.add(node.type.id)
|
|
for statement in node.body:
|
|
self.visit(statement)
|
|
|
|
def visit_Lambda(self, node, *args):
|
|
self._visit_function(node, True)
|
|
|
|
def visit_FunctionDef(self, node):
|
|
self._add_declared(node.name)
|
|
self._visit_function(node, False)
|
|
|
|
def _visit_function(self, node, islambda):
|
|
|
|
# push function state onto stack. dont log any more
|
|
# identifiers as "declared" until outside of the function,
|
|
# but keep logging identifiers as "undeclared". track
|
|
# argument names in each function header so they arent
|
|
# counted as "undeclared"
|
|
|
|
saved = {}
|
|
inf = self.in_function
|
|
self.in_function = True
|
|
for arg in node.args.args:
|
|
if arg_id(arg) in self.local_ident_stack:
|
|
saved[arg_id(arg)] = True
|
|
else:
|
|
self.local_ident_stack[arg_id(arg)] = True
|
|
if islambda:
|
|
self.visit(node.body)
|
|
else:
|
|
for n in node.body:
|
|
self.visit(n)
|
|
self.in_function = inf
|
|
for arg in node.args.args:
|
|
if arg_id(arg) not in saved:
|
|
del self.local_ident_stack[arg_id(arg)]
|
|
|
|
def visit_For(self, node):
|
|
|
|
# flip around visit
|
|
|
|
self.visit(node.iter)
|
|
self.visit(node.target)
|
|
for statement in node.body:
|
|
self.visit(statement)
|
|
for statement in node.orelse:
|
|
self.visit(statement)
|
|
|
|
def visit_Name(self, node):
|
|
if isinstance(node.ctx, _ast.Store):
|
|
self._add_declared(node.id)
|
|
if node.id not in reserved and node.id \
|
|
not in self.listener.declared_identifiers and node.id \
|
|
not in self.local_ident_stack:
|
|
self.listener.undeclared_identifiers.add(node.id)
|
|
|
|
def visit_Import(self, node):
|
|
for name in node.names:
|
|
if name.asname is not None:
|
|
self._add_declared(name.asname)
|
|
else:
|
|
self._add_declared(name.name.split('.')[0])
|
|
|
|
def visit_ImportFrom(self, node):
|
|
for name in node.names:
|
|
if name.asname is not None:
|
|
self._add_declared(name.asname)
|
|
else:
|
|
if name.name == '*':
|
|
raise exceptions.CompileException(
|
|
"'import *' is not supported, since all identifier "
|
|
"names must be explicitly declared. Please use the "
|
|
"form 'from <modulename> import <name1>, <name2>, "
|
|
"...' instead.", **self.exception_kwargs)
|
|
self._add_declared(name.name)
|
|
|
|
|
|
class FindTuple(_ast_util.NodeVisitor):
|
|
|
|
def __init__(self, listener, code_factory, **exception_kwargs):
|
|
self.listener = listener
|
|
self.exception_kwargs = exception_kwargs
|
|
self.code_factory = code_factory
|
|
|
|
def visit_Tuple(self, node):
|
|
for n in node.elts:
|
|
p = self.code_factory(n, **self.exception_kwargs)
|
|
self.listener.codeargs.append(p)
|
|
self.listener.args.append(ExpressionGenerator(n).value())
|
|
self.listener.declared_identifiers = \
|
|
self.listener.declared_identifiers.union(
|
|
p.declared_identifiers)
|
|
self.listener.undeclared_identifiers = \
|
|
self.listener.undeclared_identifiers.union(
|
|
p.undeclared_identifiers)
|
|
|
|
|
|
class ParseFunc(_ast_util.NodeVisitor):
|
|
|
|
def __init__(self, listener, **exception_kwargs):
|
|
self.listener = listener
|
|
self.exception_kwargs = exception_kwargs
|
|
|
|
def visit_FunctionDef(self, node):
|
|
self.listener.funcname = node.name
|
|
argnames = [arg_id(arg) for arg in node.args.args]
|
|
if node.args.vararg:
|
|
argnames.append(node.args.vararg)
|
|
if node.args.kwarg:
|
|
argnames.append(node.args.kwarg)
|
|
self.listener.argnames = argnames
|
|
self.listener.defaults = node.args.defaults # ast
|
|
self.listener.varargs = node.args.vararg
|
|
self.listener.kwargs = node.args.kwarg
|
|
|
|
|
|
class ExpressionGenerator(object):
|
|
|
|
def __init__(self, astnode):
|
|
self.generator = _ast_util.SourceGenerator(' ' * 4)
|
|
self.generator.visit(astnode)
|
|
|
|
def value(self):
|
|
return ''.join(self.generator.result)
|
|
else:
|
|
class FindIdentifiers(object):
|
|
|
|
def __init__(self, listener, **exception_kwargs):
|
|
self.in_function = False
|
|
self.local_ident_stack = {}
|
|
self.listener = listener
|
|
self.exception_kwargs = exception_kwargs
|
|
|
|
def _add_declared(self, name):
|
|
if not self.in_function:
|
|
self.listener.declared_identifiers.add(name)
|
|
|
|
def visitClass(self, node, *args):
|
|
self._add_declared(node.name)
|
|
|
|
def visitAssName(self, node, *args):
|
|
self._add_declared(node.name)
|
|
|
|
def visitAssign(self, node, *args):
|
|
|
|
# flip around the visiting of Assign so the expression gets
|
|
# evaluated first, in the case of a clause like "x=x+5" (x
|
|
# is undeclared)
|
|
|
|
self.visit(node.expr, *args)
|
|
for n in node.nodes:
|
|
self.visit(n, *args)
|
|
|
|
def visitLambda(self, node, *args):
|
|
self._visit_function(node, args)
|
|
|
|
def visitFunction(self, node, *args):
|
|
self._add_declared(node.name)
|
|
self._visit_function(node, args)
|
|
|
|
def _visit_function(self, node, args):
|
|
|
|
# push function state onto stack. dont log any more
|
|
# identifiers as "declared" until outside of the function,
|
|
# but keep logging identifiers as "undeclared". track
|
|
# argument names in each function header so they arent
|
|
# counted as "undeclared"
|
|
|
|
saved = {}
|
|
inf = self.in_function
|
|
self.in_function = True
|
|
for arg in node.argnames:
|
|
if arg in self.local_ident_stack:
|
|
saved[arg] = True
|
|
else:
|
|
self.local_ident_stack[arg] = True
|
|
for n in node.getChildNodes():
|
|
self.visit(n, *args)
|
|
self.in_function = inf
|
|
for arg in node.argnames:
|
|
if arg not in saved:
|
|
del self.local_ident_stack[arg]
|
|
|
|
def visitFor(self, node, *args):
|
|
|
|
# flip around visit
|
|
|
|
self.visit(node.list, *args)
|
|
self.visit(node.assign, *args)
|
|
self.visit(node.body, *args)
|
|
|
|
def visitName(self, node, *args):
|
|
if node.name not in reserved and node.name \
|
|
not in self.listener.declared_identifiers and node.name \
|
|
not in self.local_ident_stack:
|
|
self.listener.undeclared_identifiers.add(node.name)
|
|
|
|
def visitImport(self, node, *args):
|
|
for mod, alias in node.names:
|
|
if alias is not None:
|
|
self._add_declared(alias)
|
|
else:
|
|
self._add_declared(mod.split('.')[0])
|
|
|
|
def visitFrom(self, node, *args):
|
|
for mod, alias in node.names:
|
|
if alias is not None:
|
|
self._add_declared(alias)
|
|
else:
|
|
if mod == '*':
|
|
raise exceptions.CompileException(
|
|
"'import *' is not supported, since all identifier "
|
|
"names must be explicitly declared. Please use the "
|
|
"form 'from <modulename> import <name1>, <name2>, "
|
|
"...' instead.", **self.exception_kwargs)
|
|
self._add_declared(mod)
|
|
|
|
def visit(self, expr):
|
|
visitor.walk(expr, self) # , walker=walker())
|
|
|
|
|
|
class FindTuple(object):
|
|
|
|
def __init__(self, listener, code_factory, **exception_kwargs):
|
|
self.listener = listener
|
|
self.exception_kwargs = exception_kwargs
|
|
self.code_factory = code_factory
|
|
|
|
def visitTuple(self, node, *args):
|
|
for n in node.nodes:
|
|
p = self.code_factory(n, **self.exception_kwargs)
|
|
self.listener.codeargs.append(p)
|
|
self.listener.args.append(ExpressionGenerator(n).value())
|
|
self.listener.declared_identifiers = \
|
|
self.listener.declared_identifiers.union(p.declared_identifiers)
|
|
self.listener.undeclared_identifiers = \
|
|
self.listener.undeclared_identifiers.union(p.undeclared_identifiers)
|
|
|
|
def visit(self, expr):
|
|
visitor.walk(expr, self) # , walker=walker())
|
|
|
|
|
|
class ParseFunc(object):
|
|
|
|
def __init__(self, listener, **exception_kwargs):
|
|
self.listener = listener
|
|
self.exception_kwargs = exception_kwargs
|
|
|
|
def visitFunction(self, node, *args):
|
|
self.listener.funcname = node.name
|
|
self.listener.argnames = node.argnames
|
|
self.listener.defaults = node.defaults
|
|
self.listener.varargs = node.varargs
|
|
self.listener.kwargs = node.kwargs
|
|
|
|
def visit(self, expr):
|
|
visitor.walk(expr, self)
|
|
|
|
|
|
class ExpressionGenerator(object):
|
|
|
|
"""given an AST node, generates an equivalent literal Python
|
|
expression."""
|
|
|
|
def __init__(self, astnode):
|
|
self.buf = StringIO()
|
|
visitor.walk(astnode, self) # , walker=walker())
|
|
|
|
def value(self):
|
|
return self.buf.getvalue()
|
|
|
|
def operator(self, op, node, *args):
|
|
self.buf.write('(')
|
|
self.visit(node.left, *args)
|
|
self.buf.write(' %s ' % op)
|
|
self.visit(node.right, *args)
|
|
self.buf.write(')')
|
|
|
|
def booleanop(self, op, node, *args):
|
|
self.visit(node.nodes[0])
|
|
for n in node.nodes[1:]:
|
|
self.buf.write(' ' + op + ' ')
|
|
self.visit(n, *args)
|
|
|
|
def visitConst(self, node, *args):
|
|
self.buf.write(repr(node.value))
|
|
|
|
def visitAssName(self, node, *args):
|
|
|
|
# TODO: figure out OP_ASSIGN, other OP_s
|
|
|
|
self.buf.write(node.name)
|
|
|
|
def visitName(self, node, *args):
|
|
self.buf.write(node.name)
|
|
|
|
def visitMul(self, node, *args):
|
|
self.operator('*', node, *args)
|
|
|
|
def visitAnd(self, node, *args):
|
|
self.booleanop('and', node, *args)
|
|
|
|
def visitOr(self, node, *args):
|
|
self.booleanop('or', node, *args)
|
|
|
|
def visitBitand(self, node, *args):
|
|
self.booleanop('&', node, *args)
|
|
|
|
def visitBitor(self, node, *args):
|
|
self.booleanop('|', node, *args)
|
|
|
|
def visitBitxor(self, node, *args):
|
|
self.booleanop('^', node, *args)
|
|
|
|
def visitAdd(self, node, *args):
|
|
self.operator('+', node, *args)
|
|
|
|
def visitGetattr(self, node, *args):
|
|
self.visit(node.expr, *args)
|
|
self.buf.write('.%s' % node.attrname)
|
|
|
|
def visitSub(self, node, *args):
|
|
self.operator('-', node, *args)
|
|
|
|
def visitNot(self, node, *args):
|
|
self.buf.write('not ')
|
|
self.visit(node.expr)
|
|
|
|
def visitDiv(self, node, *args):
|
|
self.operator('/', node, *args)
|
|
|
|
def visitFloorDiv(self, node, *args):
|
|
self.operator('//', node, *args)
|
|
|
|
def visitSubscript(self, node, *args):
|
|
self.visit(node.expr)
|
|
self.buf.write('[')
|
|
[self.visit(x) for x in node.subs]
|
|
self.buf.write(']')
|
|
|
|
def visitUnarySub(self, node, *args):
|
|
self.buf.write('-')
|
|
self.visit(node.expr)
|
|
|
|
def visitUnaryAdd(self, node, *args):
|
|
self.buf.write('-')
|
|
self.visit(node.expr)
|
|
|
|
def visitSlice(self, node, *args):
|
|
self.visit(node.expr)
|
|
self.buf.write('[')
|
|
if node.lower is not None:
|
|
self.visit(node.lower)
|
|
self.buf.write(':')
|
|
if node.upper is not None:
|
|
self.visit(node.upper)
|
|
self.buf.write(']')
|
|
|
|
def visitDict(self, node):
|
|
self.buf.write('{')
|
|
c = node.getChildren()
|
|
for i in range(0, len(c), 2):
|
|
self.visit(c[i])
|
|
self.buf.write(': ')
|
|
self.visit(c[i + 1])
|
|
if i < len(c) - 2:
|
|
self.buf.write(', ')
|
|
self.buf.write('}')
|
|
|
|
def visitTuple(self, node):
|
|
self.buf.write('(')
|
|
c = node.getChildren()
|
|
for i in range(0, len(c)):
|
|
self.visit(c[i])
|
|
if i < len(c) - 1:
|
|
self.buf.write(', ')
|
|
self.buf.write(')')
|
|
|
|
def visitList(self, node):
|
|
self.buf.write('[')
|
|
c = node.getChildren()
|
|
for i in range(0, len(c)):
|
|
self.visit(c[i])
|
|
if i < len(c) - 1:
|
|
self.buf.write(', ')
|
|
self.buf.write(']')
|
|
|
|
def visitListComp(self, node):
|
|
self.buf.write('[')
|
|
self.visit(node.expr)
|
|
self.buf.write(' ')
|
|
for n in node.quals:
|
|
self.visit(n)
|
|
self.buf.write(']')
|
|
|
|
def visitListCompFor(self, node):
|
|
self.buf.write(' for ')
|
|
self.visit(node.assign)
|
|
self.buf.write(' in ')
|
|
self.visit(node.list)
|
|
for n in node.ifs:
|
|
self.visit(n)
|
|
|
|
def visitListCompIf(self, node):
|
|
self.buf.write(' if ')
|
|
self.visit(node.test)
|
|
|
|
def visitCompare(self, node):
|
|
self.visit(node.expr)
|
|
for tup in node.ops:
|
|
self.buf.write(tup[0])
|
|
self.visit(tup[1])
|
|
|
|
def visitCallFunc(self, node, *args):
|
|
self.visit(node.node)
|
|
self.buf.write('(')
|
|
if len(node.args):
|
|
self.visit(node.args[0])
|
|
for a in node.args[1:]:
|
|
self.buf.write(', ')
|
|
self.visit(a)
|
|
self.buf.write(')')
|
|
|
|
|
|
class walker(visitor.ASTVisitor):
|
|
|
|
def dispatch(self, node, *args):
|
|
print 'Node:', str(node)
|
|
|
|
# print "dir:", dir(node)
|
|
|
|
return visitor.ASTVisitor.dispatch(self, node, *args)
|