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| 1 # copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved. | |
| 2 # contact http://www.logilab.fr/ -- mailto:contact@logilab.fr | |
| 3 # copyright 2003-2010 Sylvain Thenault, all rights reserved. | |
| 4 # contact mailto:thenault@gmail.com | |
| 5 # | |
| 6 # This file is part of logilab-astng. | |
| 7 # | |
| 8 # logilab-astng is free software: you can redistribute it and/or modify it | |
| 9 # under the terms of the GNU Lesser General Public License as published by the | |
| 10 # Free Software Foundation, either version 2.1 of the License, or (at your | |
| 11 # option) any later version. | |
| 12 # | |
| 13 # logilab-astng is distributed in the hope that it will be useful, but | |
| 14 # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License | |
| 16 # for more details. | |
| 17 # | |
| 18 # You should have received a copy of the GNU Lesser General Public License along | |
| 19 # with logilab-astng. If not, see <http://www.gnu.org/licenses/>. | |
| 20 """this module contains some utilities to navigate in the tree or to | |
| 21 extract information from it | |
| 22 """ | |
| 23 | |
| 24 __docformat__ = "restructuredtext en" | |
| 25 | |
| 26 from logilab.astng.exceptions import ASTNGBuildingException | |
| 27 | |
| 28 | |
| 29 class ASTWalker: | |
| 30 """a walker visiting a tree in preorder, calling on the handler: | |
| 31 | |
| 32 * visit_<class name> on entering a node, where class name is the class of | |
| 33 the node in lower case | |
| 34 | |
| 35 * leave_<class name> on leaving a node, where class name is the class of | |
| 36 the node in lower case | |
| 37 """ | |
| 38 | |
| 39 def __init__(self, handler): | |
| 40 self.handler = handler | |
| 41 self._cache = {} | |
| 42 | |
| 43 def walk(self, node, _done=None): | |
| 44 """walk on the tree from <node>, getting callbacks from handler""" | |
| 45 if _done is None: | |
| 46 _done = set() | |
| 47 if node in _done: | |
| 48 raise AssertionError((id(node), node, node.parent)) | |
| 49 _done.add(node) | |
| 50 self.visit(node) | |
| 51 for child_node in node.get_children(): | |
| 52 self.handler.set_context(node, child_node) | |
| 53 assert child_node is not node | |
| 54 self.walk(child_node, _done) | |
| 55 self.leave(node) | |
| 56 assert node.parent is not node | |
| 57 | |
| 58 def get_callbacks(self, node): | |
| 59 """get callbacks from handler for the visited node""" | |
| 60 klass = node.__class__ | |
| 61 methods = self._cache.get(klass) | |
| 62 if methods is None: | |
| 63 handler = self.handler | |
| 64 kid = klass.__name__.lower() | |
| 65 e_method = getattr(handler, 'visit_%s' % kid, | |
| 66 getattr(handler, 'visit_default', None)) | |
| 67 l_method = getattr(handler, 'leave_%s' % kid, | |
| 68 getattr(handler, 'leave_default', None)) | |
| 69 self._cache[klass] = (e_method, l_method) | |
| 70 else: | |
| 71 e_method, l_method = methods | |
| 72 return e_method, l_method | |
| 73 | |
| 74 def visit(self, node): | |
| 75 """walk on the tree from <node>, getting callbacks from handler""" | |
| 76 method = self.get_callbacks(node)[0] | |
| 77 if method is not None: | |
| 78 method(node) | |
| 79 | |
| 80 def leave(self, node): | |
| 81 """walk on the tree from <node>, getting callbacks from handler""" | |
| 82 method = self.get_callbacks(node)[1] | |
| 83 if method is not None: | |
| 84 method(node) | |
| 85 | |
| 86 | |
| 87 class LocalsVisitor(ASTWalker): | |
| 88 """visit a project by traversing the locals dictionary""" | |
| 89 def __init__(self): | |
| 90 ASTWalker.__init__(self, self) | |
| 91 self._visited = {} | |
| 92 | |
| 93 def visit(self, node): | |
| 94 """launch the visit starting from the given node""" | |
| 95 if node in self._visited: | |
| 96 return | |
| 97 self._visited[node] = 1 # FIXME: use set ? | |
| 98 methods = self.get_callbacks(node) | |
| 99 if methods[0] is not None: | |
| 100 methods[0](node) | |
| 101 if 'locals' in node.__dict__: # skip Instance and other proxy | |
| 102 for name, local_node in node.items(): | |
| 103 self.visit(local_node) | |
| 104 if methods[1] is not None: | |
| 105 return methods[1](node) | |
| 106 | |
| 107 | |
| 108 def _check_children(node): | |
| 109 """a helper function to check children - parent relations""" | |
| 110 for child in node.get_children(): | |
| 111 ok = False | |
| 112 if child is None: | |
| 113 print "Hm, child of %s is None" % node | |
| 114 continue | |
| 115 if not hasattr(child, 'parent'): | |
| 116 print " ERROR: %s has child %s %x with no parent" % (node, child, id
(child)) | |
| 117 elif not child.parent: | |
| 118 print " ERROR: %s has child %s %x with parent %r" % (node, child, id
(child), child.parent) | |
| 119 elif child.parent is not node: | |
| 120 print " ERROR: %s %x has child %s %x with wrong parent %s" % (node, | |
| 121 id(node), child, id(child), child.parent) | |
| 122 else: | |
| 123 ok = True | |
| 124 if not ok: | |
| 125 print "lines;", node.lineno, child.lineno | |
| 126 print "of module", node.root(), node.root().name | |
| 127 raise ASTNGBuildingException | |
| 128 _check_children(child) | |
| 129 | |
| 130 | |
| 131 from _ast import PyCF_ONLY_AST | |
| 132 def parse(string): | |
| 133 return compile(string, "<string>", 'exec', PyCF_ONLY_AST) | |
| 134 | |
| 135 class TreeTester(object): | |
| 136 '''A helper class to see _ast tree and compare with astng tree | |
| 137 | |
| 138 indent: string for tree indent representation | |
| 139 lineno: bool to tell if we should print the line numbers | |
| 140 | |
| 141 >>> tester = TreeTester('print') | |
| 142 >>> print tester.native_tree_repr() | |
| 143 | |
| 144 <Module> | |
| 145 . body = [ | |
| 146 . <Print> | |
| 147 . . nl = True | |
| 148 . ] | |
| 149 >>> print tester.astng_tree_repr() | |
| 150 Module() | |
| 151 body = [ | |
| 152 Print() | |
| 153 dest = | |
| 154 values = [ | |
| 155 ] | |
| 156 ] | |
| 157 ''' | |
| 158 | |
| 159 indent = '. ' | |
| 160 lineno = False | |
| 161 | |
| 162 def __init__(self, sourcecode): | |
| 163 self._string = '' | |
| 164 self.sourcecode = sourcecode | |
| 165 self._ast_node = None | |
| 166 self.build_ast() | |
| 167 | |
| 168 def build_ast(self): | |
| 169 """build the _ast tree from the source code""" | |
| 170 self._ast_node = parse(self.sourcecode) | |
| 171 | |
| 172 def native_tree_repr(self, node=None, indent=''): | |
| 173 """get a nice representation of the _ast tree""" | |
| 174 self._string = '' | |
| 175 if node is None: | |
| 176 node = self._ast_node | |
| 177 self._native_repr_tree(node, indent) | |
| 178 return self._string | |
| 179 | |
| 180 | |
| 181 def _native_repr_tree(self, node, indent, _done=None): | |
| 182 """recursive method for the native tree representation""" | |
| 183 from _ast import Load as _Load, Store as _Store, Del as _Del | |
| 184 from _ast import AST as Node | |
| 185 if _done is None: | |
| 186 _done = set() | |
| 187 if node in _done: | |
| 188 self._string += '\nloop in tree: %r (%s)' % (node, | |
| 189 getattr(node, 'lineno', None)) | |
| 190 return | |
| 191 _done.add(node) | |
| 192 self._string += '\n' + indent + '<%s>' % node.__class__.__name__ | |
| 193 indent += self.indent | |
| 194 if not hasattr(node, '__dict__'): | |
| 195 self._string += '\n' + self.indent + " ** node has no __dict__ " + s
tr(node) | |
| 196 return | |
| 197 node_dict = node.__dict__ | |
| 198 if hasattr(node, '_attributes'): | |
| 199 for a in node._attributes: | |
| 200 attr = node_dict[a] | |
| 201 if attr is None: | |
| 202 continue | |
| 203 if a in ("lineno", "col_offset") and not self.lineno: | |
| 204 continue | |
| 205 self._string +='\n' + indent + a + " = " + repr(attr) | |
| 206 for field in node._fields or (): | |
| 207 attr = node_dict[field] | |
| 208 if attr is None: | |
| 209 continue | |
| 210 if isinstance(attr, list): | |
| 211 if not attr: | |
| 212 continue | |
| 213 self._string += '\n' + indent + field + ' = [' | |
| 214 for elt in attr: | |
| 215 self._native_repr_tree(elt, indent, _done) | |
| 216 self._string += '\n' + indent + ']' | |
| 217 continue | |
| 218 if isinstance(attr, (_Load, _Store, _Del)): | |
| 219 continue | |
| 220 if isinstance(attr, Node): | |
| 221 self._string += '\n' + indent + field + " = " | |
| 222 self._native_repr_tree(attr, indent, _done) | |
| 223 else: | |
| 224 self._string += '\n' + indent + field + " = " + repr(attr) | |
| 225 | |
| 226 | |
| 227 def build_astng_tree(self): | |
| 228 """build astng tree from the _ast tree | |
| 229 """ | |
| 230 from logilab.astng.builder import ASTNGBuilder | |
| 231 tree = ASTNGBuilder().string_build(self.sourcecode) | |
| 232 return tree | |
| 233 | |
| 234 def astng_tree_repr(self, ids=False): | |
| 235 """build the astng tree and return a nice tree representation""" | |
| 236 mod = self.build_astng_tree() | |
| 237 return mod.repr_tree(ids) | |
| 238 | |
| 239 | |
| 240 __all__ = ('LocalsVisitor', 'ASTWalker',) | |
| 241 | |
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Chromium Code Reviews
Issue 739393004:
Revert "Revert "pylint: upgrade to 1.3.1"" (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/tools/depot_tools/