Hack to convert PHP code from `Quasi_Namespaced_Style` to `Properly\Namespaced\Style`

nsify.py

#!/usr/bin/env python


import re
import sys


CLASSNAME = re.compile(r'^(?:(?:abstract )?class|interface) ([\w_]+)', re.MULTILINE)
CLASSES = re.compile(r'\b([A-Z][a-z]\w+([_\\][A-Z][a-z]\w)+)')


def find_classname(body):
    match = CLASSNAME.search(body)
    if not match: raise Exception("Couldn't find classname")
    return match.group(1)


def insert_namespace_stanza(body, ns):
    return body.replace('<?php\n', '<?php\n\nnamespace %s;\n' % ns, 1)


def nsify(body):
    fqn = find_classname(body)
    segments = fqn.split('_')

    ns = '\\'.join(segments[0:-1])
    name = segments[-1]

    body = insert_namespace_stanza(body, ns)
    body = body.replace(fqn, name, 1)
    body = re.sub(r'(OneToOne_[\w_]+)', lambda m: m.group(1).replace('_', '\\'), body)
    body = CLASSES.sub(r'\\\1', body)
    return body


def nsify_file(path):
    # with open(path) as f: print nsify(f.read())
    with open(path, 'r+') as f:
        contents = nsify(f.read())
        f.seek(0)
        f.write(contents)


if __name__ == '__main__':
    for path in sys.argv[1:]:
        nsify_file(path)