objc_dep.py

#!/usr/bin/python

# Nicolas Seriot
# 2011-01-06 -> 2011-12-16
# https://github.com/nst/objc_dep/

"""
Input: path of an Objective-C project

Output: import dependencies Graphviz format, unless --test is passed in which case outputs a successful exit status of 0 if no two-way dependencies are found

Typical usage: $ python objc_dep.py /path/to/project [-x regex] [-i subfolder [subfolder ...]] > graph.dot

The .dot file can be opened with Graphviz or OmniGraffle.

- red arrows: .pch imports
- blue arrows: two ways imports
"""

import sys
import os
from sets import Set
import re
from os.path import basename
import argparse

local_regex_import = re.compile("^\s*#(?:import|include)\s+\"(?P<filename>\S*)(?P<extension>\.(?:h|hpp|hh))?\"")
system_regex_import = re.compile("^\s*#(?:import|include)\s+[\"<](?P<filename>\S*)(?P<extension>\.(?:h|hpp|hh))?[\">]")
objc_extensions = ['.h', '.hh', '.hpp', '.m', '.mm', '.c', '.cc', '.cpp']

def gen_filenames_imported_in_file(path, regex_exclude, system, extensions):
    for line in open(path):
        results = re.search(system_regex_import, line) if system else re.search(local_regex_import, line)
        if results:
            filename = results.group('filename')
            extension = results.group('extension') if results.group('extension') else ""
            if regex_exclude is not None and regex_exclude.search(filename + extension):
                continue
            yield (filename + extension) if extension else filename

def dependencies_in_project(path, ext, exclude, ignore, system, extensions):
    d = {}
    
    regex_exclude = None
    if exclude:
        regex_exclude = re.compile(exclude)
    
    for root, dirs, files in os.walk(path):

        if ignore:
            for subfolder in ignore:
                if subfolder in dirs:
                    dirs.remove(subfolder)

        objc_files = (f for f in files if f.endswith(ext))

        for f in objc_files:
            
            filename = f if extensions else os.path.splitext(f)[0]
            if regex_exclude is not None and regex_exclude.search(filename):
                continue

            if filename not in d:
                d[filename] = Set()
            
            path = os.path.join(root, f)

            for imported_filename in gen_filenames_imported_in_file(path, regex_exclude, system, extensions):
                if imported_filename != filename and '+' not in imported_filename and '+' not in filename:
                    imported_filename = imported_filename if extensions else os.path.splitext(imported_filename)[0]
                    d[filename].add(imported_filename)

    return d

def dependencies_in_project_with_file_extensions(path, exts, exclude, ignore, system, extensions, root_class):

    d = {}
    
    for ext in exts:
        d2 = dependencies_in_project(path, ext, exclude, ignore, system, extensions)
        for (k, v) in d2.iteritems():
            if not k in d:
                d[k] = Set()
            d[k] = d[k].union(v)

    if root_class:
        def parse_requirements(tree, root, known_deps=[]):
            next_deps = list(tree[root])
            new_deps = []

            for dep in next_deps:
                if dep not in known_deps and dep in tree:
                    new_deps += parse_requirements(tree, dep, known_deps + next_deps)

            return (new_deps + next_deps)

        requirements = set(parse_requirements(d, root_class))

        return { k: d[k] for k in requirements if k in d}

    return d

def two_ways_dependencies(d):

    two_ways = Set()

    # d is {'a1':[b1, b2], 'a2':[b1, b3, b4], ...}

    for a, l in d.iteritems():
        for b in l:
            if b in d and a in d[b]:
                if (a, b) in two_ways or (b, a) in two_ways:
                    continue
                if a != b:
                    two_ways.add((a, b))
                    
    return two_ways

def untraversed_files(d):

    dead_ends = Set()

    for file_a, file_a_dependencies in d.iteritems():
        for file_b in file_a_dependencies:
            if not file_b in dead_ends and not file_b in d:
                dead_ends.add(file_b)

    return dead_ends

def category_files(d):
    d2 = {}
    l = []
    
    for k, v in d.iteritems():
        if not v and '+' in k:
            l.append(k)
        else:
            d2[k] = v

    return l, d2

def referenced_classes_from_dict(d):
    d2 = {}

    for k, deps in d.iteritems():
        for x in deps:
            d2.setdefault(x, Set())
            d2[x].add(k)
    
    return d2
    
def print_frequencies_chart(d):
    
    lengths = map(lambda x:len(x), d.itervalues())
    if not lengths: return
    max_length = max(lengths)
    
    for i in range(0, max_length+1):
        s = "%2d | %s\n" % (i, '*'*lengths.count(i))
        sys.stderr.write(s)

    sys.stderr.write("\n")
    
    l = [Set() for i in range(max_length+1)]
    for k, v in d.iteritems():
        l[len(v)].add(k)

    for i in range(0, max_length+1):
        s = "%2d | %s\n" % (i, ", ".join(sorted(list(l[i]))))
        sys.stderr.write(s)

def dependencies_in_dot_format(path, exclude, ignore, system, extensions, root_class):
    
    d = dependencies_in_project_with_file_extensions(path, objc_extensions, exclude, ignore, system, extensions, root_class)

    two_ways_set = two_ways_dependencies(d)
    untraversed_set = untraversed_files(d)

    category_list, d = category_files(d)

    pch_set = dependencies_in_project(path, '.pch', exclude, ignore, system, extensions)

    #
    
    sys.stderr.write("# number of imports\n\n")
    print_frequencies_chart(d)
    
    sys.stderr.write("\n# times the class is imported\n\n")
    d2 = referenced_classes_from_dict(d)    
    print_frequencies_chart(d2)
        
    #

    l = []
    l.append("digraph G {")
    l.append("\tnode [shape=box];")

    for k, deps in d.iteritems():
        if deps:
            deps.discard(k)
        
        if len(deps) == 0:
            l.append("\t\"%s\" -> {};" % (k))
        
        for k2 in deps:
            if not ((k, k2) in two_ways_set or (k2, k) in two_ways_set):
                l.append("\t\"%s\" -> \"%s\";" % (k, k2))

    l.append("\t")
    for (k, v) in pch_set.iteritems():
        l.append("\t\"%s\" [color=red];" % k)
        for x in v:
            l.append("\t\"%s\" -> \"%s\" [color=red];" % (k, x))
    
    l.append("\t")
    l.append("\tedge [color=blue, dir=both];")

    for (k, k2) in two_ways_set:
        l.append("\t\"%s\" -> \"%s\";" % (k, k2))

    for k in untraversed_set:
        l.append("\t\"%s\" [color=gray, style=dashed, fontcolor=gray]" % k)
    
    if category_list:
        l.append("\t")
        l.append("\tedge [color=black];")
        l.append("\tnode [shape=plaintext];")
        l.append("\t\"Categories\" [label=\"%s\"];" % "\\n".join(category_list))

    if ignore:
        l.append("\t")
        l.append("\tnode [shape=box, color=blue];")
        l.append("\t\"Ignored\" [label=\"%s\"];" % "\\n".join(ignore))

    l.append("}\n")
    return '\n'.join(l)

def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("-x", "--exclude", nargs='?', default='' ,help="regular expression of substrings to exclude from module names")
    parser.add_argument("-i", "--ignore", nargs='*', help="list of subfolder names to ignore")
    parser.add_argument("-s", "--system", action='store_true', default=False, help="include system dependencies")
    parser.add_argument("-e", "--extensions", action='store_true', default=False, help="print file extensions")
    parser.add_argument("-r", "--root", default='', help="Class to use as root of dependency graph")
    parser.add_argument("-t", "--test", action='store_true', default=False, help="Exit with a success status of 0 if no two-way dependencies exist or failure otherwise, instead of outputting a graph")
    parser.add_argument("project_path", help="path to folder hierarchy containing Objective-C files")
    args= parser.parse_args()

    if not args.test:
        print dependencies_in_dot_format(args.project_path, args.exclude, args.ignore, args.system, args.extensions, args.root)
    else:
        # Test if two-way dependencies exist. If none do, then exit on success (0), otherwise exit on failure (1)
        d = dependencies_in_project_with_file_extensions(args.project_path, objc_extensions, args.exclude, args.ignore, args.system, args.extensions, args.root)
        two_ways_set = two_ways_dependencies(d)

        if len(two_ways_set) == 0:
            sys.exit(0)
        else:
            sys.stderr.write("Error: Found two way dependencies:\n")
            for (k, k2) in two_ways_set:
                sys.stderr.write("%s <-> %s\n" % (k, k2))
            sys.exit(1)

if __name__=='__main__':
    main()