repr.py :  » Mobile » Python-for-PalmOS » Python-1.5.2+reduced-1.0 » Lib » Python Open Source

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Python Open Source » Mobile » Python for PalmOS 
Python for PalmOS » Python 1.5.2 reduced 1.0 » Lib » repr.py
"""Redo the `...` (representation) but with limits on most sizes."""

import string

class Repr:
  def __init__(self):
    self.maxlevel = 6
    self.maxtuple = 6
    self.maxlist = 6
    self.maxdict = 4
    self.maxstring = 30
    self.maxlong = 40
    self.maxother = 20
  def repr(self, x):
    return self.repr1(x, self.maxlevel)
  def repr1(self, x, level):
    typename = `type(x)`[7:-2] # "<type '......'>"
    if ' ' in typename:
      parts = string.split(typename)
      typename = string.joinfields(parts, '_')
    if hasattr(self, 'repr_' + typename):
      return getattr(self, 'repr_' + typename)(x, level)
    else:
      s = `x`
      if len(s) > self.maxother:
        i = max(0, (self.maxother-3)/2)
        j = max(0, self.maxother-3-i)
        s = s[:i] + '...' + s[len(s)-j:]
      return s
  def repr_tuple(self, x, level):
    n = len(x)
    if n == 0: return '()'
    if level <= 0: return '(...)'
    s = ''
    for i in range(min(n, self.maxtuple)):
      if s: s = s + ', '
      s = s + self.repr1(x[i], level-1)
    if n > self.maxtuple: s = s + ', ...'
    elif n == 1: s = s + ','
    return '(' + s + ')'
  def repr_list(self, x, level):
    n = len(x)
    if n == 0: return '[]'
    if level <= 0: return '[...]'
    s = ''
    for i in range(min(n, self.maxlist)):
      if s: s = s + ', '
      s = s + self.repr1(x[i], level-1)
    if n > self.maxlist: s = s + ', ...'
    return '[' + s + ']'
  def repr_dictionary(self, x, level):
    n = len(x)
    if n == 0: return '{}'
    if level <= 0: return '{...}'
    s = ''
    keys = x.keys()
    keys.sort()
    for i in range(min(n, self.maxdict)):
      if s: s = s + ', '
      key = keys[i]
      s = s + self.repr1(key, level-1)
      s = s + ': ' + self.repr1(x[key], level-1)
    if n > self.maxdict: s = s + ', ...'
    return '{' + s + '}'
  def repr_string(self, x, level):
    s = `x[:self.maxstring]`
    if len(s) > self.maxstring:
      i = max(0, (self.maxstring-3)/2)
      j = max(0, self.maxstring-3-i)
      s = `x[:i] + x[len(x)-j:]`
      s = s[:i] + '...' + s[len(s)-j:]
    return s
  def repr_long_int(self, x, level):
    s = `x` # XXX Hope this isn't too slow...
    if len(s) > self.maxlong:
      i = max(0, (self.maxlong-3)/2)
      j = max(0, self.maxlong-3-i)
      s = s[:i] + '...' + s[len(s)-j:]
    return s
  def repr_instance(self, x, level):
    try:
      s = `x`
      # Bugs in x.__repr__() can cause arbitrary
      # exceptions -- then make up something
    except:
      return '<' + x.__class__.__name__ + ' instance at ' + \
          hex(id(x))[2:] + '>'
    if len(s) > self.maxstring:
      i = max(0, (self.maxstring-3)/2)
      j = max(0, self.maxstring-3-i)
      s = s[:i] + '...' + s[len(s)-j:]
    return s

aRepr = Repr()
repr = aRepr.repr
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