gvsig-scripting / org.gvsig.scripting / trunk / org.gvsig.scripting / org.gvsig.scripting.app / org.gvsig.scripting.app.mainplugin / src / main / resources-plugin / scripting / lib / astroid / as_string.py @ 745
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# copyright 2003-2013 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of astroid.
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#
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# astroid is free software: you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as published by the
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# Free Software Foundation, either version 2.1 of the License, or (at your
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# option) any later version.
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#
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# astroid is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
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# for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with astroid. If not, see <http://www.gnu.org/licenses/>.
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"""This module renders Astroid nodes as string:
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* :func:`to_code` function return equivalent (hopefuly 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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INDENT = ' ' # 4 spaces ; keep indentation variable |
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def dump(node, ids=False): |
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"""print a nice astroid tree representation.
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:param ids: if true, we also print the ids (usefull for debugging)
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"""
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result = [] |
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_repr_tree(node, result, ids=ids) |
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return "\n".join(result) |
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|
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def _repr_tree(node, result, indent='', _done=None, ids=False): |
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"""built a tree representation of a node as a list of lines"""
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if _done is None: |
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_done = set()
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if not hasattr(node, '_astroid_fields'): # not a astroid node |
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return
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if node in _done: |
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result.append(indent + 'loop in tree: %s' % node)
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return
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_done.add(node) |
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node_str = str(node)
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if ids:
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node_str += ' . \t%x' % id(node) |
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result.append(indent + node_str) |
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indent += INDENT |
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for field in node._astroid_fields: |
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value = getattr(node, field)
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if isinstance(value, (list, tuple)): |
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result.append(indent + field + " = [")
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for child in value: |
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if isinstance(child, (list, tuple)): |
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# special case for Dict # FIXME
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_repr_tree(child[0], result, indent, _done, ids)
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_repr_tree(child[1], result, indent, _done, ids)
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result.append(indent + ',')
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else:
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_repr_tree(child, result, indent, _done, ids) |
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result.append(indent + "]")
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else:
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result.append(indent + field + " = ")
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_repr_tree(value, result, indent, _done, ids) |
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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 __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 INDENT + stmts.replace('\n', '\n'+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_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 and node.decorators.accept(self) or '' |
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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 = bases and '(%s)' % bases or '' |
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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 = bases and '(%s)' % bases or '' |
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docs = node.doc and '\n%s"""%s"""' % (INDENT, node.doc) or '' |
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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 and node.decorators.accept(self) or '' |
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docs = node.doc and '\n%s"""%s"""' % (INDENT, node.doc) or '' |
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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 = node.doc and '"""%s"""\n\n' % node.doc or '' |
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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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|
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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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else:
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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) |
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|
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def visit_set(self, node): |
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"""return an astroid.Set node as string"""
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return '{%s}' % ', '.join([child.accept(self) for child in node.elts]) |
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def visit_setcomp(self, node): |
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"""return an astroid.SetComp 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_slice(self, node): |
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"""return a astroid.Slice node as string"""
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lower = node.lower and node.lower.accept(self) or '' |
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upper = node.upper and node.upper.accept(self) or '' |
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step = node.step and node.step.accept(self) or '' |
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if step:
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return '%s:%s:%s' % (lower, upper, step) |
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return '%s:%s' % (lower, upper) |
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|
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def visit_subscript(self, node): |
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"""return an astroid.Subscript node as string"""
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return '%s[%s]' % (node.value.accept(self), node.slice.accept(self)) |
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|
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def visit_tryexcept(self, node): |
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"""return an astroid.TryExcept node as string"""
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trys = ['try:\n%s' % self._stmt_list(node.body)] |
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for handler in node.handlers: |
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trys.append(handler.accept(self))
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if node.orelse:
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trys.append('else:\n%s' % self._stmt_list(node.orelse)) |
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return '\n'.join(trys) |
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|
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def visit_tryfinally(self, node): |
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"""return an astroid.TryFinally node as string"""
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return 'try:\n%s\nfinally:\n%s' % (self._stmt_list(node.body), |
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self._stmt_list(node.finalbody))
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|
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def visit_tuple(self, node): |
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"""return an astroid.Tuple node as string"""
|
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if len(node.elts) == 1: |
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return '(%s, )' % node.elts[0].accept(self) |
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return '(%s)' % ', '.join([child.accept(self) for child in node.elts]) |
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|
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def visit_unaryop(self, node): |
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"""return an astroid.UnaryOp node as string"""
|
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if node.op == 'not': |
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operator = 'not '
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else:
|
| 439 |
operator = node.op |
| 440 |
return '%s%s' % (operator, node.operand.accept(self)) |
| 441 |
|
| 442 |
def visit_while(self, node): |
| 443 |
"""return an astroid.While node as string"""
|
| 444 |
whiles = 'while %s:\n%s' % (node.test.accept(self), |
| 445 |
self._stmt_list(node.body))
|
| 446 |
if node.orelse:
|
| 447 |
whiles = '%s\nelse:\n%s' % (whiles, self._stmt_list(node.orelse)) |
| 448 |
return whiles
|
| 449 |
|
| 450 |
def visit_with(self, node): # 'with' without 'as' is possible |
| 451 |
"""return an astroid.With node as string"""
|
| 452 |
items = ', '.join(('(%s)' % expr.accept(self)) + |
| 453 |
(vars and ' as (%s)' % (vars.accept(self)) or '') |
| 454 |
for expr, vars in node.items) |
| 455 |
return 'with %s:\n%s' % (items, self._stmt_list(node.body)) |
| 456 |
|
| 457 |
def visit_yield(self, node): |
| 458 |
"""yield an ast.Yield node as string"""
|
| 459 |
yi_val = node.value and (" " + node.value.accept(self)) or "" |
| 460 |
expr = 'yield' + yi_val
|
| 461 |
if node.parent.is_statement:
|
| 462 |
return expr
|
| 463 |
else:
|
| 464 |
return "(%s)" % (expr,) |
| 465 |
|
| 466 |
def visit_starred(self, node): |
| 467 |
"""return Starred node as string"""
|
| 468 |
return "*" + node.value.accept(self) |
| 469 |
|
| 470 |
|
| 471 |
# These aren't for real AST nodes, but for inference objects.
|
| 472 |
|
| 473 |
def visit_frozenset(self, node): |
| 474 |
return node.parent.accept(self) |
| 475 |
|
| 476 |
def visit_super(self, node): |
| 477 |
return node.parent.accept(self) |
| 478 |
|
| 479 |
def visit_yes(self, node): |
| 480 |
return "Uninferable" |
| 481 |
|
| 482 |
|
| 483 |
class AsStringVisitor3k(AsStringVisitor): |
| 484 |
"""AsStringVisitor3k overwrites some AsStringVisitor methods"""
|
| 485 |
|
| 486 |
def visit_excepthandler(self, node): |
| 487 |
if node.type:
|
| 488 |
if node.name:
|
| 489 |
excs = 'except %s as %s' % (node.type.accept(self), |
| 490 |
node.name.accept(self))
|
| 491 |
else:
|
| 492 |
excs = 'except %s' % node.type.accept(self) |
| 493 |
else:
|
| 494 |
excs = 'except'
|
| 495 |
return '%s:\n%s' % (excs, self._stmt_list(node.body)) |
| 496 |
|
| 497 |
def visit_nonlocal(self, node): |
| 498 |
"""return an astroid.Nonlocal node as string"""
|
| 499 |
return 'nonlocal %s' % ', '.join(node.names) |
| 500 |
|
| 501 |
def visit_raise(self, node): |
| 502 |
"""return an astroid.Raise node as string"""
|
| 503 |
if node.exc:
|
| 504 |
if node.cause:
|
| 505 |
return 'raise %s from %s' % (node.exc.accept(self), |
| 506 |
node.cause.accept(self))
|
| 507 |
return 'raise %s' % node.exc.accept(self) |
| 508 |
return 'raise' |
| 509 |
|
| 510 |
def visit_yieldfrom(self, node): |
| 511 |
""" Return an astroid.YieldFrom node as string. """
|
| 512 |
yi_val = node.value and (" " + node.value.accept(self)) or "" |
| 513 |
expr = 'yield from' + yi_val
|
| 514 |
if node.parent.is_statement:
|
| 515 |
return expr
|
| 516 |
else:
|
| 517 |
return "(%s)" % (expr,) |
| 518 |
|
| 519 |
def visit_asyncfunctiondef(self, node): |
| 520 |
function = super(AsStringVisitor3k, self).visit_functiondef(node) |
| 521 |
return 'async ' + function.strip() |
| 522 |
|
| 523 |
def visit_await(self, node): |
| 524 |
return 'await %s' % node.value.accept(self) |
| 525 |
|
| 526 |
def visit_asyncwith(self, node): |
| 527 |
return 'async %s' % self.visit_with(node) |
| 528 |
|
| 529 |
def visit_asyncfor(self, node): |
| 530 |
return 'async %s' % self.visit_for(node) |
| 531 |
|
| 532 |
|
| 533 |
def _import_string(names): |
| 534 |
"""return a list of (name, asname) formatted as a string"""
|
| 535 |
_names = [] |
| 536 |
for name, asname in names: |
| 537 |
if asname is not None: |
| 538 |
_names.append('%s as %s' % (name, asname))
|
| 539 |
else:
|
| 540 |
_names.append(name) |
| 541 |
return ', '.join(_names) |
| 542 |
|
| 543 |
|
| 544 |
if sys.version_info >= (3, 0): |
| 545 |
AsStringVisitor = AsStringVisitor3k |
| 546 |
|
| 547 |
# this visitor is stateless, thus it can be reused
|
| 548 |
to_code = AsStringVisitor() |