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# $Header: /export/home/gjanee/bucket99/paradigms/RCS/TextUtils.py,v 1.1 2002/10/30 04:03:17 gjanee Exp $

# SYNOPSIS
#
#     TextUtils
#
#         .mappings
#
#             .identity
#                 The identity mapping.
#
#             .nonAlphanumericToWhitespace
#                 Maps non-alphanumeric characters to whitespace.
#
#             .lowercase
#                 Maps characters to their lowercase equivalents.
#
#             .uppercase
#                 Maps characters to their uppercase equivalents.
#
#             .lowercaseAlphanumericOthersToWhitespace
#                 A combination of 'nonAlphanumericToWhitespace' and
#                 'lowercase'.
#
#             .uppercaseAlphanumericOthersToWhitespace
#                 A combination of 'nonAlphanumericToWhitespace' and
#                 'uppercase'.
#
#         .deleteLists
#
#             .keepAll
#                 Keep all characters.
#
#             .keepAlphanumeric
#                 Keep alphanumeric characters; delete all others.
#
# DESCRIPTION
#
#     Handy character mappings and character delete lists.
#
# AUTHOR
#
#     Greg Janee
#     gjanee@alexandria.ucsb.edu
#
# HISTORY
#
#     $Log: TextUtils.py,v $
#     Revision 1.1  2002/10/30 04:03:17  gjanee
#     Initial revision
#

import string

from java.lang import Character

def _makeIdentity ():
    return string.maketrans("", "")

def _makeNonAlphanumericToWhitespace ():
    m = ""
    for i in range(256):
        if Character.isLetterOrDigit(chr(i)):
            m = m + chr(i)
        else:
            m = m + " "
    return m

def _makeLowercase ():
    m = ""
    for i in range(256):
        m = m + Character.toLowerCase(chr(i))
    return m

def _makeUppercase ():
    m = ""
    for i in range(256):
        m = m + Character.toUpperCase(chr(i))
    return m

def _makeLowercaseAlphanumericOthersToWhitespace ():
    m = ""
    for i in range(256):
        if Character.isLetterOrDigit(chr(i)):
            m = m + Character.toLowerCase(chr(i))
        else:
            m = m + " "
    return m

def _makeUppercaseAlphanumericOthersToWhitespace ():
    m = ""
    for i in range(256):
        if Character.isLetterOrDigit(chr(i)):
            m = m + Character.toUpperCase(chr(i))
        else:
            m = m + " "
    return m

class Mappings:
    identity = _makeIdentity()
    nonAlphanumericToWhitespace = _makeNonAlphanumericToWhitespace()
    lowercase = _makeLowercase()
    uppercase = _makeUppercase()
    lowercaseAlphanumericOthersToWhitespace =\
        _makeLowercaseAlphanumericOthersToWhitespace()
    uppercaseAlphanumericOthersToWhitespace =\
        _makeUppercaseAlphanumericOthersToWhitespace()

def _makeKeepAlphanumeric ():
    l = ""
    for i in range(256):
        if not Character.isLetterOrDigit(chr(i)):
            l = l + chr(i)
    return l

class DeleteLists:
    keepAll = ""
    keepAlphanumeric = _makeKeepAlphanumeric()

class TextUtils:
    mappings = Mappings()
    deleteLists = DeleteLists()