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titlecase.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
Original Perl version by: John Gruber http://daringfireball.net/ 10 May 2008
Python version by Stuart Colville http://muffinresearch.co.uk
License: http://www.opensource.org/licenses/mit-license.php
"""

import re

__all__ = ['titlecase']
__version__ = '0.5'

SMALL = 'a|an|and|as|at|but|by|en|for|if|in|of|on|or|the|to|v\.?|via|vs\.?'
PUNCT = r"""!"#$%&'‘()*+,\-./:;?@[\\\]_`{|}~"""

SMALL_WORDS = re.compile(r'^(%s)$' % SMALL, re.I)
INLINE_PERIOD = re.compile(r'[a-z][.][a-z]', re.I)
UC_ELSEWHERE = re.compile(r'[%s]*?[a-zA-Z]+[A-Z]+?' % PUNCT)
CAPFIRST = re.compile(r"^[%s]*?([A-Za-z])" % PUNCT)
SMALL_FIRST = re.compile(r'^([%s]*)(%s)\b' % (PUNCT, SMALL), re.I)
SMALL_LAST = re.compile(r'\b(%s)[%s]?$' % (SMALL, PUNCT), re.I)
SUBPHRASE = re.compile(r'([:.;?!][ ])(%s)' % SMALL)
APOS_SECOND = re.compile(r"^[dol]{1}['‘]{1}[a-z]+$", re.I)
ALL_CAPS = re.compile(r'^[A-Z\s%s]+$' % PUNCT)
UC_INITIALS = re.compile(r"^(?:[A-Z]{1}\.{1}|[A-Z]{1}\.{1}[A-Z]{1})+$")
MAC_MC = re.compile(r"^([Mm]a?c)(\w+)")

def titlecase(text):

    """
    Titlecases input text

    This filter changes all words to Title Caps, and attempts to be clever
    about *un*capitalizing SMALL words like a/an/the in the input.

    The list of "SMALL words" which are not capped comes from
    the New York Times Manual of Style, plus 'vs' and 'v'.

    """

    all_caps = ALL_CAPS.match(text)

    words = re.split('\s', text)
    line = []
    for word in words:
        if all_caps:
            if UC_INITIALS.match(word):
                line.append(word)
                continue
            else:
                word = word.lower()

        if APOS_SECOND.match(word):
            word = word.replace(word[0], word[0].upper())
            word = word.replace(word[2], word[2].upper())
            line.append(word)
            continue
        if INLINE_PERIOD.search(word) or UC_ELSEWHERE.match(word):
            line.append(word)
            continue
        if SMALL_WORDS.match(word):
            line.append(word.lower())
            continue

        match = MAC_MC.match(word)
        if match:
            line.append("%s%s" % (match.group(1).capitalize(),
                                  match.group(2).capitalize()))
            continue

        hyphenated = []
        for item in word.split('-'):
            hyphenated.append(CAPFIRST.sub(lambda m: m.group(0).upper(), item))
        line.append("-".join(hyphenated))


    result = " ".join(line)

    result = SMALL_FIRST.sub(lambda m: '%s%s' % (
        m.group(1),
        m.group(2).capitalize()
    ), result)

    result = SMALL_LAST.sub(lambda m: m.group(0).capitalize(), result)

    result = SUBPHRASE.sub(lambda m: '%s%s' % (
        m.group(1),
        m.group(2).capitalize()
    ), result)

    return result


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