# Copyright 2006 The Trustees of Indiana University.

# Use, modification and distribution is subject to the Boost Software
# License, Version 1.0. (See copy at http://www.boost.org/LICENSE_1_0.txt)

#  Authors: Chris Mueller
#           Andrew Lumsdaine

import string

# ------------------------------
# HTML Generation Task Examples
# ------------------------------

class Tag:
  """
  Base class for a HTML tag of the form <tag attr1="1" attr2="2">
  </tag>.

  Subclasses just need to set the TAG name and any attributes.
  """

  TAG = None
  ATTRS = {}
  
  def __init__(self, state = None, index = 0, value = None):
    self._call = 0
    self._index = index
    self._value = value
    self._state = state
    return

  def _fmtAttrs(self):
    retStr = ''
    if len(self.ATTRS) > 0:
      retStr = ' ' + string.join(['%s="%s"' % (attr, value) for attr, value
                                  in zip(self.ATTRS.keys(), self.ATTRS.values())], ' ')
    return retStr

  def _printStart(self):
    print '  ' * self._index, '<%s%s>' % (self.TAG, self._fmtAttrs())
    return

  def _printEnd(self):
    print '  ' * self._index, '</%s>' % (self.TAG)
    return
  
  def __iter__(self):
    self._call = 0
    return self

  def next(self):
    if self._call == 0:
      self._printStart()
      self._call = 1
    else:
      self._printEnd()
      raise StopIteration
    return


class HTMLtr(Tag):
  TAG = 'tr'

class HTMLtd(Tag):
  TAG = 'td'

class HTMLtable(Tag):
  TAG = 'table'
  ATTRS = {'border':'1', 'width':'100%'}


class HTMLhtml(Tag):
  TAG = 'html'



if __name__=='__main__':
  from psweep import *
  
  # Gererate an HTML table with 10 rows and 5 columns.
  html  = range(1)
  table = range(1)
  rows  = range(10)
  cols  = range(5)

  params = [html, table, rows, cols]

  state = BoundState(params)
  state.bind(html, HTMLhtml)
  state.bind(table, HTMLtable)  
  state.bind(rows, HTMLtr)
  state.bind(cols, HTMLtd)  

  e = enumerator(params, state)

  for s in e:
    print ' ' * len(state) * 2, 'Hello PSWEEP!'

  state.Finish()