Coverage for cogapp\whiteutils : 92%

""" Indentation utilities for Cog. 

    http://nedbatchelder.com/code/cog 

    Copyright 2004-2009, Ned Batchelder. 

""" 

import re 

def whitePrefix(strings): 

    """ Determine the whitespace prefix common to all non-blank lines 

        in the argument list. 

    """ 

    # Remove all blank lines from the list 

    strings = [s for s in strings if s.strip() != ''] 

    if not strings: return '' 

    # Find initial whitespace chunk in the first line. 

    # This is the best prefix we can hope for. 

    prefix = re.match(r'\s*', strings[0]).group(0) 

    # Loop over the other strings, keeping only as much of 

    # the prefix as matches each string. 

    for s in strings: 

        for i in range(len(prefix)): 

27            if prefix[i] != s[i]: 

                prefix = prefix[:i] 

                break 

    return prefix 

def reindentBlock(lines, newIndent=''): 

    """ Take a block of text as a string or list of lines. 

        Remove any common whitespace indentation. 

        Re-indent using newIndent, and return it as a single string. 

    """ 

    if isinstance(lines, basestring): 

        lines = lines.split('\n') 

    oldIndent = whitePrefix(lines) 

    outLines = [] 

    for l in lines: 

        if oldIndent: 

            l = l.replace(oldIndent, '', 1) 

        if l and newIndent: 

            l = newIndent + l 

        outLines.append(l) 

    return '\n'.join(outLines) 

def commonPrefix(strings): 

    """ Find the longest string that is a prefix of all the strings. 

    """ 

52    if not strings: 

        return '' 

    prefix = strings[0] 

    for s in strings: 

        if len(s) < len(prefix): 

            prefix = prefix[:len(s)] 

        if not prefix: 

            return '' 

        for i in range(len(prefix)): 

            if prefix[i] != s[i]: 

                prefix = prefix[:i] 

                break 

    return prefix