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fixer_util.py
""" Utility functions from 2to3, 3to2 and python-modernize (and some home-grown ones). Licences: 2to3: PSF License v2 3to2: Apache Software License (from 3to2/setup.py) python-modernize licence: BSD (from python-modernize/LICENSE) """ from lib2to3.fixer_util import (FromImport, Newline, is_import, find_root, does_tree_import, Comma) from lib2to3.pytree import Leaf, Node from lib2to3.pygram import python_symbols as syms, python_grammar from lib2to3.pygram import token from lib2to3.fixer_util import (Node, Call, Name, syms, Comma, Number) import re def canonical_fix_name(fix, avail_fixes): """ Examples: >>> canonical_fix_name('fix_wrap_text_literals') 'libfuturize.fixes.fix_wrap_text_literals' >>> canonical_fix_name('wrap_text_literals') 'libfuturize.fixes.fix_wrap_text_literals' >>> canonical_fix_name('wrap_te') ValueError("unknown fixer name") >>> canonical_fix_name('wrap') ValueError("ambiguous fixer name") """ if ".fix_" in fix: return fix else: if fix.startswith('fix_'): fix = fix[4:] # Infer the full module name for the fixer. # First ensure that no names clash (e.g. # lib2to3.fixes.fix_blah and libfuturize.fixes.fix_blah): found = [f for f in avail_fixes if f.endswith('fix_{0}'.format(fix))] if len(found) > 1: raise ValueError("Ambiguous fixer name. Choose a fully qualified " "module name instead from these:\n" + "\n".join(" " + myf for myf in found)) elif len(found) == 0: raise ValueError("Unknown fixer. Use --list-fixes or -l for a list.") return found[0] ## These functions are from 3to2 by Joe Amenta: def Star(prefix=None): return Leaf(token.STAR, u'*', prefix=prefix) def DoubleStar(prefix=None): return Leaf(token.DOUBLESTAR, u'**', prefix=prefix) def Minus(prefix=None): return Leaf(token.MINUS, u'-', prefix=prefix) def commatize(leafs): """ Accepts/turns: (Name, Name, ..., Name, Name) Returns/into: (Name, Comma, Name, Comma, ..., Name, Comma, Name) """ new_leafs = [] for leaf in leafs: new_leafs.append(leaf) new_leafs.append(Comma()) del new_leafs[-1] return new_leafs def indentation(node): """ Returns the indentation for this node Iff a node is in a suite, then it has indentation. """ while node.parent is not None and node.parent.type != syms.suite: node = node.parent if node.parent is None: return u"" # The first three children of a suite are NEWLINE, INDENT, (some other node) # INDENT.value contains the indentation for this suite # anything after (some other node) has the indentation as its prefix. if node.type == token.INDENT: return node.value elif node.prev_sibling is not None and node.prev_sibling.type == token.INDENT: return node.prev_sibling.value elif node.prev_sibling is None: return u"" else: return node.prefix def indentation_step(node): """ Dirty little trick to get the difference between each indentation level Implemented by finding the shortest indentation string (technically, the "least" of all of the indentation strings, but tabs and spaces mixed won't get this far, so those are synonymous.) """ r = find_root(node) # Collect all indentations into one set. all_indents = set(i.value for i in r.pre_order() if i.type == token.INDENT) if not all_indents: # nothing is indented anywhere, so we get to pick what we want return u" " # four spaces is a popular convention else: return min(all_indents) def suitify(parent): """ Turn the stuff after the first colon in parent's children into a suite, if it wasn't already """ for node in parent.children: if node.type == syms.suite: # already in the prefered format, do nothing return # One-liners have no suite node, we have to fake one up for i, node in enumerate(parent.children): if node.type == token.COLON: break else: raise ValueError(u"No class suite and no ':'!") # Move everything into a suite node suite = Node(syms.suite, [Newline(), Leaf(token.INDENT, indentation(node) + indentation_step(node))]) one_node = parent.children[i+1] one_node.remove() one_node.prefix = u'' suite.append_child(one_node) parent.append_child(suite) def NameImport(package, as_name=None, prefix=None): """ Accepts a package (Name node), name to import it as (string), and optional prefix and returns a node: import <package> [as <as_name>] """ if prefix is None: prefix = u"" children = [Name(u"import", prefix=prefix), package] if as_name is not None: children.extend([Name(u"as", prefix=u" "), Name(as_name, prefix=u" ")]) return Node(syms.import_name, children) _compound_stmts = (syms.if_stmt, syms.while_stmt, syms.for_stmt, syms.try_stmt, syms.with_stmt) _import_stmts = (syms.import_name, syms.import_from) def import_binding_scope(node): """ Generator yields all nodes for which a node (an import_stmt) has scope The purpose of this is for a call to _find() on each of them """ # import_name / import_from are small_stmts assert node.type in _import_stmts test = node.next_sibling # A small_stmt can only be followed by a SEMI or a NEWLINE. while test.type == token.SEMI: nxt = test.next_sibling # A SEMI can only be followed by a small_stmt or a NEWLINE if nxt.type == token.NEWLINE: break else: yield nxt # A small_stmt can only be followed by either a SEMI or a NEWLINE test = nxt.next_sibling # Covered all subsequent small_stmts after the import_stmt # Now to cover all subsequent stmts after the parent simple_stmt parent = node.parent assert parent.type == syms.simple_stmt test = parent.next_sibling while test is not None: # Yes, this will yield NEWLINE and DEDENT. Deal with it. yield test test = test.next_sibling context = parent.parent # Recursively yield nodes following imports inside of a if/while/for/try/with statement if context.type in _compound_stmts: # import is in a one-liner c = context while c.next_sibling is not None: yield c.next_sibling c = c.next_sibling context = context.parent # Can't chain one-liners on one line, so that takes care of that. p = context.parent if p is None: return # in a multi-line suite while p.type in _compound_stmts: if context.type == syms.suite: yield context context = context.next_sibling if context is None: context = p.parent p = context.parent if p is None: break def ImportAsName(name, as_name, prefix=None): new_name = Name(name) new_as = Name(u"as", prefix=u" ") new_as_name = Name(as_name, prefix=u" ") new_node = Node(syms.import_as_name, [new_name, new_as, new_as_name]) if prefix is not None: new_node.prefix = prefix return new_node def is_docstring(node): """ Returns True if the node appears to be a docstring """ return (node.type == syms.simple_stmt and len(node.children) > 0 and node.children[0].type == token.STRING) def future_import(feature, node): """ This seems to work """ root = find_root(node) if does_tree_import(u"__future__", feature, node): return # Look for a shebang or encoding line shebang_encoding_idx = None for idx, node in enumerate(root.children): # Is it a shebang or encoding line? if is_shebang_comment(node) or is_encoding_comment(node): shebang_encoding_idx = idx if is_docstring(node): # skip over docstring continue names = check_future_import(node) if not names: # not a future statement; need to insert before this break if feature in names: # already imported return import_ = FromImport(u'__future__', [Leaf(token.NAME, feature, prefix=" ")]) if shebang_encoding_idx == 0 and idx == 0: # If this __future__ import would go on the first line, # detach the shebang / encoding prefix from the current first line. # and attach it to our new __future__ import node. import_.prefix = root.children[0].prefix root.children[0].prefix = u'' # End the __future__ import line with a newline and add a blank line # afterwards: children = [import_ , Newline()] root.insert_child(idx, Node(syms.simple_stmt, children)) def future_import2(feature, node): """ An alternative to future_import() which might not work ... """ root = find_root(node) if does_tree_import(u"__future__", feature, node): return insert_pos = 0 for idx, node in enumerate(root.children): if node.type == syms.simple_stmt and node.children and \ node.children[0].type == token.STRING: insert_pos = idx + 1 break for thing_after in root.children[insert_pos:]: if thing_after.type == token.NEWLINE: insert_pos += 1 continue prefix = thing_after.prefix thing_after.prefix = u"" break else: prefix = u"" import_ = FromImport(u"__future__", [Leaf(token.NAME, feature, prefix=u" ")]) children = [import_, Newline()] root.insert_child(insert_pos, Node(syms.simple_stmt, children, prefix=prefix)) def parse_args(arglist, scheme): u""" Parse a list of arguments into a dict """ arglist = [i for i in arglist if i.type != token.COMMA] ret_mapping = dict([(k, None) for k in scheme]) for i, arg in enumerate(arglist): if arg.type == syms.argument and arg.children[1].type == token.EQUAL: # argument < NAME '=' any > slot = arg.children[0].value ret_mapping[slot] = arg.children[2] else: slot = scheme[i] ret_mapping[slot] = arg return ret_mapping # def is_import_from(node): # """Returns true if the node is a statement "from ... import ..." # """ # return node.type == syms.import_from def is_import_stmt(node): return (node.type == syms.simple_stmt and node.children and is_import(node.children[0])) def touch_import_top(package, name_to_import, node): """Works like `does_tree_import` but adds an import statement at the top if it was not imported (but below any __future__ imports) and below any comments such as shebang lines). Based on lib2to3.fixer_util.touch_import() Calling this multiple times adds the imports in reverse order. Also adds "standard_library.install_aliases()" after "from future import standard_library". This should probably be factored into another function. """ root = find_root(node) if does_tree_import(package, name_to_import, root): return # Ideally, we would look for whether futurize --all-imports has been run, # as indicated by the presence of ``from builtins import (ascii, ..., # zip)`` -- and, if it has, we wouldn't import the name again. # Look for __future__ imports and insert below them found = False for name in ['absolute_import', 'division', 'print_function', 'unicode_literals']: if does_tree_import('__future__', name, root): found = True break if found: # At least one __future__ import. We want to loop until we've seen them # all. start, end = None, None for idx, node in enumerate(root.children): if check_future_import(node): start = idx # Start looping idx2 = start while node: node = node.next_sibling idx2 += 1 if not check_future_import(node): end = idx2 break break assert start is not None assert end is not None insert_pos = end else: # No __future__ imports. # We look for a docstring and insert the new node below that. If no docstring # exists, just insert the node at the top. for idx, node in enumerate(root.children): if node.type != syms.simple_stmt: break if not is_docstring(node): # This is the usual case. break insert_pos = idx if package is None: import_ = Node(syms.import_name, [ Leaf(token.NAME, u"import"), Leaf(token.NAME, name_to_import, prefix=u" ") ]) else: import_ = FromImport(package, [Leaf(token.NAME, name_to_import, prefix=u" ")]) if name_to_import == u'standard_library': # Add: # standard_library.install_aliases() # after: # from future import standard_library install_hooks = Node(syms.simple_stmt, [Node(syms.power, [Leaf(token.NAME, u'standard_library'), Node(syms.trailer, [Leaf(token.DOT, u'.'), Leaf(token.NAME, u'install_aliases')]), Node(syms.trailer, [Leaf(token.LPAR, u'('), Leaf(token.RPAR, u')')]) ]) ] ) children_hooks = [install_hooks, Newline()] else: children_hooks = [] # FromImport(package, [Leaf(token.NAME, name_to_import, prefix=u" ")]) children_import = [import_, Newline()] old_prefix = root.children[insert_pos].prefix root.children[insert_pos].prefix = u'' root.insert_child(insert_pos, Node(syms.simple_stmt, children_import, prefix=old_prefix)) if len(children_hooks) > 0: root.insert_child(insert_pos + 1, Node(syms.simple_stmt, children_hooks)) ## The following functions are from python-modernize by Armin Ronacher: # (a little edited). def check_future_import(node): """If this is a future import, return set of symbols that are imported, else return None.""" # node should be the import statement here savenode = node if not (node.type == syms.simple_stmt and node.children): return set() node = node.children[0] # now node is the import_from node if not (node.type == syms.import_from and # node.type == token.NAME and # seems to break it hasattr(node.children[1], 'value') and node.children[1].value == u'__future__'): return set() if node.children[3].type == token.LPAR: node = node.children[4] else: node = node.children[3] # now node is the import_as_name[s] # print(python_grammar.number2symbol[node.type]) # breaks sometimes if node.type == syms.import_as_names: result = set() for n in node.children: if n.type == token.NAME: result.add(n.value) elif n.type == syms.import_as_name: n = n.children[0] assert n.type == token.NAME result.add(n.value) return result elif node.type == syms.import_as_name: node = node.children[0] assert node.type == token.NAME return set([node.value]) elif node.type == token.NAME: return set([node.value]) else: # TODO: handle brackets like this: # from __future__ import (absolute_import, division) assert False, "strange import: %s" % savenode SHEBANG_REGEX = r'^#!.*python' ENCODING_REGEX = r"^#.*coding[:=]\s*([-\w.]+)" def is_shebang_comment(node): """ Comments are prefixes for Leaf nodes. Returns whether the given node has a prefix that looks like a shebang line or an encoding line: #!/usr/bin/env python #!/usr/bin/python3 """ return bool(re.match(SHEBANG_REGEX, node.prefix)) def is_encoding_comment(node): """ Comments are prefixes for Leaf nodes. Returns whether the given node has a prefix that looks like an encoding line: # coding: utf-8 # encoding: utf-8 # -*- coding: <encoding name> -*- # vim: set fileencoding=<encoding name> : """ return bool(re.match(ENCODING_REGEX, node.prefix)) def wrap_in_fn_call(fn_name, args, prefix=None): """ Example: >>> wrap_in_fn_call("oldstr", (arg,)) oldstr(arg) >>> wrap_in_fn_call("olddiv", (arg1, arg2)) olddiv(arg1, arg2) >>> wrap_in_fn_call("olddiv", [arg1, comma, arg2, comma, arg3]) olddiv(arg1, arg2, arg3) """ assert len(args) > 0 if len(args) == 2: expr1, expr2 = args newargs = [expr1, Comma(), expr2] else: newargs = args return Call(Name(fn_name), newargs, prefix=prefix)
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