source: trunk/essentials/dev-lang/python/Lib/stringold.py@ 3226

# module 'string' -- A collection of string operations

# Warning: most of the code you see here isn't normally used nowadays.  With
# Python 1.6, many of these functions are implemented as methods on the
# standard string object. They used to be implemented by a built-in module
# called strop, but strop is now obsolete itself.

"""Common string manipulations.

Public module variables:

whitespace -- a string containing all characters considered whitespace
lowercase -- a string containing all characters considered lowercase letters
uppercase -- a string containing all characters considered uppercase letters
letters -- a string containing all characters considered letters
digits -- a string containing all characters considered decimal digits
hexdigits -- a string containing all characters considered hexadecimal digits
octdigits -- a string containing all characters considered octal digits

"""

# Some strings for ctype-style character classification
whitespace = ' \t\n\r\v\f'
lowercase = 'abcdefghijklmnopqrstuvwxyz'
uppercase = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
letters = lowercase + uppercase
digits = '0123456789'
hexdigits = digits + 'abcdef' + 'ABCDEF'
octdigits = '01234567'

# Case conversion helpers
_idmap = ''
for i in range(256): _idmap = _idmap + chr(i)
del i

# Backward compatible names for exceptions
index_error = ValueError
atoi_error = ValueError
atof_error = ValueError
atol_error = ValueError

# convert UPPER CASE letters to lower case
def lower(s):
    """lower(s) -> string

    Return a copy of the string s converted to lowercase.

    """
    return s.lower()

# Convert lower case letters to UPPER CASE
def upper(s):
    """upper(s) -> string

    Return a copy of the string s converted to uppercase.

    """
    return s.upper()

# Swap lower case letters and UPPER CASE
def swapcase(s):
    """swapcase(s) -> string

    Return a copy of the string s with upper case characters
    converted to lowercase and vice versa.

    """
    return s.swapcase()

# Strip leading and trailing tabs and spaces
def strip(s):
    """strip(s) -> string

    Return a copy of the string s with leading and trailing
    whitespace removed.

    """
    return s.strip()

# Strip leading tabs and spaces
def lstrip(s):
    """lstrip(s) -> string

    Return a copy of the string s with leading whitespace removed.

    """
    return s.lstrip()

# Strip trailing tabs and spaces
def rstrip(s):
    """rstrip(s) -> string

    Return a copy of the string s with trailing whitespace
    removed.

    """
    return s.rstrip()


# Split a string into a list of space/tab-separated words
def split(s, sep=None, maxsplit=0):
    """split(str [,sep [,maxsplit]]) -> list of strings

    Return a list of the words in the string s, using sep as the
    delimiter string.  If maxsplit is nonzero, splits into at most
    maxsplit words If sep is not specified, any whitespace string
    is a separator.  Maxsplit defaults to 0.

    (split and splitfields are synonymous)

    """
    return s.split(sep, maxsplit)
splitfields = split

# Join fields with optional separator
def join(words, sep = ' '):
    """join(list [,sep]) -> string

    Return a string composed of the words in list, with
    intervening occurrences of sep.  The default separator is a
    single space.

    (joinfields and join are synonymous)

    """
    return sep.join(words)
joinfields = join

# for a little bit of speed
_apply = apply

# Find substring, raise exception if not found
def index(s, *args):
    """index(s, sub [,start [,end]]) -> int

    Like find but raises ValueError when the substring is not found.

    """
    return _apply(s.index, args)

# Find last substring, raise exception if not found
def rindex(s, *args):
    """rindex(s, sub [,start [,end]]) -> int

    Like rfind but raises ValueError when the substring is not found.