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#! /usr/bin/python
import ast
import yaml
class DefinitionVisitor(ast.NodeVisitor):
def __init__(self):
super(DefinitionVisitor, self).__init__()
self.functions = {}
self.classes = {}
self.names = {}
self.attrs = set()
self.definitions = {
'def': self.functions,
'class': self.classes,
'names': self.names,
'attrs': self.attrs,
}
def visit_Name(self, node):
self.names.setdefault(type(node.ctx).__name__, set()).add(node.id)
def visit_Attribute(self, node):
self.attrs.add(node.attr)
for child in ast.iter_child_nodes(node):
self.visit(child)
def visit_ClassDef(self, node):
visitor = DefinitionVisitor()
self.classes[node.name] = visitor.definitions
for child in ast.iter_child_nodes(node):
visitor.visit(child)
def visit_FunctionDef(self, node):
visitor = DefinitionVisitor()
self.functions[node.name] = visitor.definitions
for child in ast.iter_child_nodes(node):
visitor.visit(child)
def non_empty(defs):
functions = {name: non_empty(f) for name, f in defs['def'].items()}
classes = {name: non_empty(f) for name, f in defs['class'].items()}
result = {}
if functions: result['def'] = functions
if classes: result['class'] = classes
names = defs['names']
uses = []
for name in names.get('Load', ()):
if name not in names.get('Param', ()) and name not in names.get('Store', ()):
uses.append(name)
uses.extend(defs['attrs'])
if uses: result['uses'] = uses
result['names'] = names
result['attrs'] = defs['attrs']
return result
def definitions_in_code(input_code):
input_ast = ast.parse(input_code)
visitor = DefinitionVisitor()
visitor.visit(input_ast)
definitions = non_empty(visitor.definitions)
return definitions
def definitions_in_file(filepath):
with open(filepath) as f:
return definitions_in_code(f.read())
def defined_names(prefix, defs, names):
for name, funcs in defs.get('def', {}).items():
names.setdefault(name, {'defined': []})['defined'].append(prefix + name)
defined_names(prefix + name + ".", funcs, names)
for name, funcs in defs.get('class', {}).items():
names.setdefault(name, {'defined': []})['defined'].append(prefix + name)
defined_names(prefix + name + ".", funcs, names)
def used_names(prefix, item, defs, names):
for name, funcs in defs.get('def', {}).items():
used_names(prefix + name + ".", name, funcs, names)
for name, funcs in defs.get('class', {}).items():
used_names(prefix + name + ".", name, funcs, names)
for used in defs.get('uses', ()):
if used in names:
names[used].setdefault('used', {}).setdefault(item, []).append(prefix.rstrip('.'))
if __name__ == '__main__':
import sys, os, argparse, re
parser = argparse.ArgumentParser(description='Find definitions.')
parser.add_argument(
"--unused", action="store_true", help="Only list unused definitions"
)
parser.add_argument(
"--ignore", action="append", metavar="REGEXP", help="Ignore a pattern"
)
parser.add_argument(
"--pattern", action="append", metavar="REGEXP",
help="Search for a pattern"
)
parser.add_argument(
"directories", nargs='+', metavar="DIR",
help="Directories to search for definitions"
)
parser.add_argument(
"--referrers", default=0, type=int,
help="Include referrers up to the given depth"
)
parser.add_argument(
"--format", default="yaml",
help="Output format, one of 'yaml' or 'dot'"
)
args = parser.parse_args()
definitions = {}
for directory in args.directories:
for root, dirs, files in os.walk(directory):
for filename in files:
if filename.endswith(".py"):
filepath = os.path.join(root, filename)
definitions[filepath] = definitions_in_file(filepath)
names = {}
for filepath, defs in definitions.items():
defined_names(filepath + ":", defs, names)
for filepath, defs in definitions.items():
used_names(filepath + ":", None, defs, names)
patterns = [re.compile(pattern) for pattern in args.pattern or ()]
ignore = [re.compile(pattern) for pattern in args.ignore or ()]
result = {}
for name, definition in names.items():
if patterns and not any(pattern.match(name) for pattern in patterns):
continue
if ignore and any(pattern.match(name) for pattern in ignore):
continue
if args.unused and definition.get('used'):
continue
result[name] = definition
referrer_depth = args.referrers
referrers = set()
while referrer_depth:
referrer_depth -= 1
for entry in result.values():
for used_by in entry["used"]:
referrers.add(used_by)
for name, definition in names.items():
if not name in referrers:
continue
if ignore and any(pattern.match(name) for pattern in ignore):
continue
result[name] = definition
if args.format == 'yaml':
yaml.dump(result, sys.stdout, default_flow_style=False)
elif args.format == 'dot':
print "digraph {"
for name, entry in result.items():
print name
for used_by in entry.get("used", ()):
if used_by in result:
print used_by, "->", name
print "}"
else:
raise ValueError("Unknown format %r" % (args.format))
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