528 lines
20 KiB
Python
528 lines
20 KiB
Python
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# Copyright (c) 2009-2011, 2013-2014 LOGILAB S.A. (Paris, FRANCE) <contact@logilab.fr>
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# Copyright (c) 2013-2016 Claudiu Popa <pcmanticore@gmail.com>
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# Copyright (c) 2013-2014 Google, Inc.
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# Copyright (c) 2015-2016 Cara Vinson <ceridwenv@gmail.com>
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# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html
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# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER
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"""This module renders Astroid nodes as string:
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* :func:`to_code` function return equivalent (hopefully valid) python string
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* :func:`dump` function return an internal representation of nodes found
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in the tree, useful for debugging or understanding the tree structure
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"""
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import sys
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import six
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# pylint: disable=unused-argument
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class AsStringVisitor(object):
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"""Visitor to render an Astroid node as a valid python code string"""
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def __init__(self, indent):
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self.indent = indent
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def __call__(self, node):
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"""Makes this visitor behave as a simple function"""
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return node.accept(self)
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def _stmt_list(self, stmts):
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"""return a list of nodes to string"""
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stmts = '\n'.join([nstr for nstr in [n.accept(self) for n in stmts] if nstr])
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return self.indent + stmts.replace('\n', '\n'+self.indent)
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## visit_<node> methods ###########################################
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def visit_arguments(self, node):
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"""return an astroid.Function node as string"""
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return node.format_args()
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def visit_assignattr(self, node):
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"""return an astroid.AssAttr node as string"""
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return self.visit_attribute(node)
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def visit_assert(self, node):
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"""return an astroid.Assert node as string"""
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if node.fail:
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return 'assert %s, %s' % (node.test.accept(self),
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node.fail.accept(self))
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return 'assert %s' % node.test.accept(self)
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def visit_assignname(self, node):
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"""return an astroid.AssName node as string"""
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return node.name
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def visit_assign(self, node):
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"""return an astroid.Assign node as string"""
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lhs = ' = '.join([n.accept(self) for n in node.targets])
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return '%s = %s' % (lhs, node.value.accept(self))
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def visit_augassign(self, node):
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"""return an astroid.AugAssign node as string"""
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return '%s %s %s' % (node.target.accept(self), node.op, node.value.accept(self))
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def visit_annassign(self, node):
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"""Return an astroid.AugAssign node as string"""
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target = node.target.accept(self)
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annotation = node.annotation.accept(self)
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if node.value is None:
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return '%s: %s' % (target, annotation)
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return '%s: %s = %s' % (target, annotation, node.value.accept(self))
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def visit_repr(self, node):
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"""return an astroid.Repr node as string"""
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return '`%s`' % node.value.accept(self)
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def visit_binop(self, node):
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"""return an astroid.BinOp node as string"""
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return '(%s) %s (%s)' % (node.left.accept(self), node.op, node.right.accept(self))
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def visit_boolop(self, node):
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"""return an astroid.BoolOp node as string"""
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return (' %s ' % node.op).join(['(%s)' % n.accept(self)
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for n in node.values])
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def visit_break(self, node):
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"""return an astroid.Break node as string"""
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return 'break'
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def visit_call(self, node):
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"""return an astroid.Call node as string"""
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expr_str = node.func.accept(self)
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args = [arg.accept(self) for arg in node.args]
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if node.keywords:
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keywords = [kwarg.accept(self) for kwarg in node.keywords]
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else:
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keywords = []
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args.extend(keywords)
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return '%s(%s)' % (expr_str, ', '.join(args))
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def visit_classdef(self, node):
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"""return an astroid.ClassDef node as string"""
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decorate = node.decorators.accept(self) if node.decorators else ''
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bases = ', '.join([n.accept(self) for n in node.bases])
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if sys.version_info[0] == 2:
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bases = '(%s)' % bases if bases else ''
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else:
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metaclass = node.metaclass()
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if metaclass and not node.has_metaclass_hack():
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if bases:
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bases = '(%s, metaclass=%s)' % (bases, metaclass.name)
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else:
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bases = '(metaclass=%s)' % metaclass.name
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else:
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bases = '(%s)' % bases if bases else ''
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docs = '\n%s"""%s"""' % (self.indent, node.doc) if node.doc else ''
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return '\n\n%sclass %s%s:%s\n%s\n' % (decorate, node.name, bases, docs,
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self._stmt_list(node.body))
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def visit_compare(self, node):
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"""return an astroid.Compare node as string"""
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rhs_str = ' '.join(['%s %s' % (op, expr.accept(self))
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for op, expr in node.ops])
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return '%s %s' % (node.left.accept(self), rhs_str)
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def visit_comprehension(self, node):
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"""return an astroid.Comprehension node as string"""
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ifs = ''.join([' if %s' % n.accept(self) for n in node.ifs])
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return 'for %s in %s%s' % (node.target.accept(self),
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node.iter.accept(self), ifs)
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def visit_const(self, node):
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"""return an astroid.Const node as string"""
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return repr(node.value)
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def visit_continue(self, node):
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"""return an astroid.Continue node as string"""
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return 'continue'
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def visit_delete(self, node): # XXX check if correct
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"""return an astroid.Delete node as string"""
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return 'del %s' % ', '.join([child.accept(self)
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for child in node.targets])
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def visit_delattr(self, node):
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"""return an astroid.DelAttr node as string"""
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return self.visit_attribute(node)
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def visit_delname(self, node):
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"""return an astroid.DelName node as string"""
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return node.name
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def visit_decorators(self, node):
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"""return an astroid.Decorators node as string"""
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return '@%s\n' % '\n@'.join([item.accept(self) for item in node.nodes])
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def visit_dict(self, node):
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"""return an astroid.Dict node as string"""
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return '{%s}' % ', '.join(self._visit_dict(node))
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def _visit_dict(self, node):
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for key, value in node.items:
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key = key.accept(self)
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value = value.accept(self)
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if key == '**':
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# It can only be a DictUnpack node.
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yield key + value
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else:
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yield '%s: %s' % (key, value)
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def visit_dictunpack(self, node):
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return '**'
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def visit_dictcomp(self, node):
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"""return an astroid.DictComp node as string"""
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return '{%s: %s %s}' % (node.key.accept(self), node.value.accept(self),
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' '.join([n.accept(self) for n in node.generators]))
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def visit_expr(self, node):
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"""return an astroid.Discard node as string"""
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return node.value.accept(self)
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def visit_emptynode(self, node):
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"""dummy method for visiting an Empty node"""
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return ''
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def visit_excepthandler(self, node):
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if node.type:
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if node.name:
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excs = 'except %s, %s' % (node.type.accept(self),
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node.name.accept(self))
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else:
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excs = 'except %s' % node.type.accept(self)
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else:
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excs = 'except'
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return '%s:\n%s' % (excs, self._stmt_list(node.body))
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def visit_ellipsis(self, node):
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"""return an astroid.Ellipsis node as string"""
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return '...'
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def visit_empty(self, node):
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"""return an Empty node as string"""
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return ''
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def visit_exec(self, node):
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"""return an astroid.Exec node as string"""
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if node.locals:
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return 'exec %s in %s, %s' % (node.expr.accept(self),
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node.locals.accept(self),
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node.globals.accept(self))
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if node.globals:
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return 'exec %s in %s' % (node.expr.accept(self),
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node.globals.accept(self))
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return 'exec %s' % node.expr.accept(self)
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def visit_extslice(self, node):
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"""return an astroid.ExtSlice node as string"""
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return ','.join([dim.accept(self) for dim in node.dims])
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def visit_for(self, node):
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"""return an astroid.For node as string"""
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fors = 'for %s in %s:\n%s' % (node.target.accept(self),
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node.iter.accept(self),
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self._stmt_list(node.body))
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if node.orelse:
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fors = '%s\nelse:\n%s' % (fors, self._stmt_list(node.orelse))
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return fors
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def visit_importfrom(self, node):
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"""return an astroid.ImportFrom node as string"""
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return 'from %s import %s' % ('.' * (node.level or 0) + node.modname,
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_import_string(node.names))
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def visit_functiondef(self, node):
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"""return an astroid.Function node as string"""
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decorate = node.decorators.accept(self) if node.decorators else ''
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docs = '\n%s"""%s"""' % (self.indent, node.doc) if node.doc else ''
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return_annotation = ''
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if six.PY3 and node.returns:
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return_annotation = '->' + node.returns.as_string()
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trailer = return_annotation + ":"
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else:
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trailer = ":"
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def_format = "\n%sdef %s(%s)%s%s\n%s"
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return def_format % (decorate, node.name,
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node.args.accept(self),
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trailer, docs,
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self._stmt_list(node.body))
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def visit_generatorexp(self, node):
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"""return an astroid.GeneratorExp node as string"""
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return '(%s %s)' % (node.elt.accept(self),
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' '.join([n.accept(self) for n in node.generators]))
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def visit_attribute(self, node):
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"""return an astroid.Getattr node as string"""
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return '%s.%s' % (node.expr.accept(self), node.attrname)
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def visit_global(self, node):
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"""return an astroid.Global node as string"""
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return 'global %s' % ', '.join(node.names)
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def visit_if(self, node):
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"""return an astroid.If node as string"""
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ifs = ['if %s:\n%s' % (node.test.accept(self), self._stmt_list(node.body))]
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if node.orelse:# XXX use elif ???
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ifs.append('else:\n%s' % self._stmt_list(node.orelse))
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return '\n'.join(ifs)
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def visit_ifexp(self, node):
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"""return an astroid.IfExp node as string"""
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return '%s if %s else %s' % (node.body.accept(self),
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node.test.accept(self),
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node.orelse.accept(self))
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def visit_import(self, node):
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"""return an astroid.Import node as string"""
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return 'import %s' % _import_string(node.names)
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def visit_keyword(self, node):
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"""return an astroid.Keyword node as string"""
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if node.arg is None:
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return '**%s' % node.value.accept(self)
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return '%s=%s' % (node.arg, node.value.accept(self))
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def visit_lambda(self, node):
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"""return an astroid.Lambda node as string"""
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return 'lambda %s: %s' % (node.args.accept(self),
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node.body.accept(self))
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def visit_list(self, node):
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"""return an astroid.List node as string"""
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return '[%s]' % ', '.join([child.accept(self) for child in node.elts])
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def visit_listcomp(self, node):
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"""return an astroid.ListComp node as string"""
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return '[%s %s]' % (node.elt.accept(self),
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' '.join([n.accept(self) for n in node.generators]))
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def visit_module(self, node):
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"""return an astroid.Module node as string"""
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docs = '"""%s"""\n\n' % node.doc if node.doc else ''
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return docs + '\n'.join([n.accept(self) for n in node.body]) + '\n\n'
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def visit_name(self, node):
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"""return an astroid.Name node as string"""
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return node.name
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def visit_pass(self, node):
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"""return an astroid.Pass node as string"""
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return 'pass'
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def visit_print(self, node):
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"""return an astroid.Print node as string"""
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nodes = ', '.join([n.accept(self) for n in node.values])
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if not node.nl:
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nodes = '%s,' % nodes
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if node.dest:
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return 'print >> %s, %s' % (node.dest.accept(self), nodes)
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return 'print %s' % nodes
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def visit_raise(self, node):
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"""return an astroid.Raise node as string"""
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if node.exc:
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if node.inst:
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if node.tback:
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return 'raise %s, %s, %s' % (node.exc.accept(self),
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node.inst.accept(self),
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node.tback.accept(self))
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return 'raise %s, %s' % (node.exc.accept(self),
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node.inst.accept(self))
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return 'raise %s' % node.exc.accept(self)
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return 'raise'
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def visit_return(self, node):
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"""return an astroid.Return node as string"""
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if node.value:
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return 'return %s' % node.value.accept(self)
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return 'return'
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def visit_index(self, node):
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"""return a astroid.Index node as string"""
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|
return node.value.accept(self)
|
||
|
|
|
||
|
|
def visit_set(self, node):
|
||
|
|
"""return an astroid.Set node as string"""
|
||
|
|
return '{%s}' % ', '.join([child.accept(self) for child in node.elts])
|
||
|
|
|
||
|
|
def visit_setcomp(self, node):
|
||
|
|
"""return an astroid.SetComp node as string"""
|
||
|
|
return '{%s %s}' % (node.elt.accept(self),
|
||
|
|
' '.join([n.accept(self) for n in node.generators]))
|
||
|
|
|
||
|
|
def visit_slice(self, node):
|
||
|
|
"""return a astroid.Slice node as string"""
|
||
|
|
lower = node.lower.accept(self) if node.lower else ''
|
||
|
|
upper = node.upper.accept(self) if node.upper else''
|
||
|
|
step = node.step.accept(self) if node.step else ''
|
||
|
|
if step:
|
||
|
|
return '%s:%s:%s' % (lower, upper, step)
|
||
|
|
return '%s:%s' % (lower, upper)
|
||
|
|
|
||
|
|
def visit_subscript(self, node):
|
||
|
|
"""return an astroid.Subscript node as string"""
|
||
|
|
return '%s[%s]' % (node.value.accept(self), node.slice.accept(self))
|
||
|
|
|
||
|
|
def visit_tryexcept(self, node):
|
||
|
|
"""return an astroid.TryExcept node as string"""
|
||
|
|
trys = ['try:\n%s' % self._stmt_list(node.body)]
|
||
|
|
for handler in node.handlers:
|
||
|
|
trys.append(handler.accept(self))
|
||
|
|
if node.orelse:
|
||
|
|
trys.append('else:\n%s' % self._stmt_list(node.orelse))
|
||
|
|
return '\n'.join(trys)
|
||
|
|
|
||
|
|
def visit_tryfinally(self, node):
|
||
|
|
"""return an astroid.TryFinally node as string"""
|
||
|
|
return 'try:\n%s\nfinally:\n%s' % (self._stmt_list(node.body),
|
||
|
|
self._stmt_list(node.finalbody))
|
||
|
|
|
||
|
|
def visit_tuple(self, node):
|
||
|
|
"""return an astroid.Tuple node as string"""
|
||
|
|
if len(node.elts) == 1:
|
||
|
|
return '(%s, )' % node.elts[0].accept(self)
|
||
|
|
return '(%s)' % ', '.join([child.accept(self) for child in node.elts])
|
||
|
|
|
||
|
|
def visit_unaryop(self, node):
|
||
|
|
"""return an astroid.UnaryOp node as string"""
|
||
|
|
if node.op == 'not':
|
||
|
|
operator = 'not '
|
||
|
|
else:
|
||
|
|
operator = node.op
|
||
|
|
return '%s%s' % (operator, node.operand.accept(self))
|
||
|
|
|
||
|
|
def visit_while(self, node):
|
||
|
|
"""return an astroid.While node as string"""
|
||
|
|
whiles = 'while %s:\n%s' % (node.test.accept(self),
|
||
|
|
self._stmt_list(node.body))
|
||
|
|
if node.orelse:
|
||
|
|
whiles = '%s\nelse:\n%s' % (whiles, self._stmt_list(node.orelse))
|
||
|
|
return whiles
|
||
|
|
|
||
|
|
def visit_with(self, node): # 'with' without 'as' is possible
|
||
|
|
"""return an astroid.With node as string"""
|
||
|
|
items = ', '.join(('(%s)' % expr.accept(self)) +
|
||
|
|
(vars and ' as (%s)' % (vars.accept(self)) or '')
|
||
|
|
for expr, vars in node.items)
|
||
|
|
return 'with %s:\n%s' % (items, self._stmt_list(node.body))
|
||
|
|
|
||
|
|
def visit_yield(self, node):
|
||
|
|
"""yield an ast.Yield node as string"""
|
||
|
|
yi_val = (" " + node.value.accept(self)) if node.value else ""
|
||
|
|
expr = 'yield' + yi_val
|
||
|
|
if node.parent.is_statement:
|
||
|
|
return expr
|
||
|
|
|
||
|
|
return "(%s)" % (expr,)
|
||
|
|
|
||
|
|
def visit_starred(self, node):
|
||
|
|
"""return Starred node as string"""
|
||
|
|
return "*" + node.value.accept(self)
|
||
|
|
|
||
|
|
# These aren't for real AST nodes, but for inference objects.
|
||
|
|
|
||
|
|
def visit_frozenset(self, node):
|
||
|
|
return node.parent.accept(self)
|
||
|
|
|
||
|
|
def visit_super(self, node):
|
||
|
|
return node.parent.accept(self)
|
||
|
|
|
||
|
|
def visit_uninferable(self, node):
|
||
|
|
return str(node)
|
||
|
|
|
||
|
|
|
||
|
|
class AsStringVisitor3(AsStringVisitor):
|
||
|
|
"""AsStringVisitor3 overwrites some AsStringVisitor methods"""
|
||
|
|
|
||
|
|
def visit_excepthandler(self, node):
|
||
|
|
if node.type:
|
||
|
|
if node.name:
|
||
|
|
excs = 'except %s as %s' % (node.type.accept(self),
|
||
|
|
node.name.accept(self))
|
||
|
|
else:
|
||
|
|
excs = 'except %s' % node.type.accept(self)
|
||
|
|
else:
|
||
|
|
excs = 'except'
|
||
|
|
return '%s:\n%s' % (excs, self._stmt_list(node.body))
|
||
|
|
|
||
|
|
def visit_nonlocal(self, node):
|
||
|
|
"""return an astroid.Nonlocal node as string"""
|
||
|
|
return 'nonlocal %s' % ', '.join(node.names)
|
||
|
|
|
||
|
|
def visit_raise(self, node):
|
||
|
|
"""return an astroid.Raise node as string"""
|
||
|
|
if node.exc:
|
||
|
|
if node.cause:
|
||
|
|
return 'raise %s from %s' % (node.exc.accept(self),
|
||
|
|
node.cause.accept(self))
|
||
|
|
return 'raise %s' % node.exc.accept(self)
|
||
|
|
return 'raise'
|
||
|
|
|
||
|
|
def visit_yieldfrom(self, node):
|
||
|
|
""" Return an astroid.YieldFrom node as string. """
|
||
|
|
yi_val = (" " + node.value.accept(self)) if node.value else ""
|
||
|
|
expr = 'yield from' + yi_val
|
||
|
|
if node.parent.is_statement:
|
||
|
|
return expr
|
||
|
|
|
||
|
|
return "(%s)" % (expr,)
|
||
|
|
|
||
|
|
def visit_asyncfunctiondef(self, node):
|
||
|
|
function = super(AsStringVisitor3, self).visit_functiondef(node)
|
||
|
|
return 'async ' + function.strip()
|
||
|
|
|
||
|
|
def visit_await(self, node):
|
||
|
|
return 'await %s' % node.value.accept(self)
|
||
|
|
|
||
|
|
def visit_asyncwith(self, node):
|
||
|
|
return 'async %s' % self.visit_with(node)
|
||
|
|
|
||
|
|
def visit_asyncfor(self, node):
|
||
|
|
return 'async %s' % self.visit_for(node)
|
||
|
|
|
||
|
|
def visit_joinedstr(self, node):
|
||
|
|
# Special treatment for constants,
|
||
|
|
# as we want to join literals not reprs
|
||
|
|
string = ''.join(
|
||
|
|
value.value if type(value).__name__ == 'Const'
|
||
|
|
else value.accept(self)
|
||
|
|
for value in node.values
|
||
|
|
)
|
||
|
|
return "f'%s'" % string
|
||
|
|
|
||
|
|
def visit_formattedvalue(self, node):
|
||
|
|
return '{%s}' % node.value.accept(self)
|
||
|
|
|
||
|
|
def visit_comprehension(self, node):
|
||
|
|
"""return an astroid.Comprehension node as string"""
|
||
|
|
return '%s%s' % ('async ' if node.is_async else '',
|
||
|
|
super(AsStringVisitor3, self).visit_comprehension(node))
|
||
|
|
|
||
|
|
|
||
|
|
def _import_string(names):
|
||
|
|
"""return a list of (name, asname) formatted as a string"""
|
||
|
|
_names = []
|
||
|
|
for name, asname in names:
|
||
|
|
if asname is not None:
|
||
|
|
_names.append('%s as %s' % (name, asname))
|
||
|
|
else:
|
||
|
|
_names.append(name)
|
||
|
|
return ', '.join(_names)
|
||
|
|
|
||
|
|
|
||
|
|
if sys.version_info >= (3, 0):
|
||
|
|
AsStringVisitor = AsStringVisitor3
|
||
|
|
|
||
|
|
# This sets the default indent to 4 spaces.
|
||
|
|
to_code = AsStringVisitor(' ')
|