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# textwindow4 -
 
import re, string

class WordContext:
      def __init__(self,re_word):
          self.re_word = re_word

      def get_word_indices(self,str):
          pos = 0
          matches = []
          #re_word = "[\s,.!?;\-\"\']*(\w+\'\w+|\w+\-\w+|\w+)[\s,.!?;\-\"\']+"
          re_pattern = re.compile(self.re_word,re.IGNORECASE)
          match = 1
          while (pos < len(str)) and match:
                match = re_pattern.search(str,pos)
                if match:
                   #print "groups: ", match.groups()
                   span = match.span()
                   #print "span: ", span
                   pos = span[1]
                   matches.append(span)
          return matches

      def get_left_context(self,s):
          w = self.get_word_indices(s)
          left_start = w[0][0]
          left_end   = w[3][1]
          context = s[left_start:left_end]
          return context

      def get_right_context(self,s):
          print "check1"
          w = self.get_word_indices(s)
          print "check2"
          print "w: ", w
          last = len(w) - 1
          right_start = w[last-3][0]
          right_end   = w[last][1]
          print right_start, right_end
          context = s[right_start:right_end]
          print context
          return context

class TextWindow:
      def __init__(self,pattern,re_word):
          self.pattern = pattern 
          self.re_word = re_word
          self.window = ['','','']
          self.front = 0

      def insert(self,s):
          self.window[self.front] = string.rstrip(s) + ' '
          self.front = (self.front + 1) % 3

      def buffer_full(self):
          return (len(self.window[0]) != 0) and \
                 (len(self.window[1]) != 0) and \
                 (len(self.window[2]) != 0)

      def search(self):
          front = middle = back = ''
          if self.buffer_full():
             match = re.search(self.pattern,self.window[1])
             if match:
                lines = string.rstrip(self.window[0]) + ' ' + \
                        string.rstrip(self.window[1]) + ' ' + \
                        string.rstrip(self.window[2])
                match = re.search(self.pattern,lines)
                span  = match.span() 
                start = span[0]
                end   = span[1]
                left  = lines[0:start]
                middle = lines[start:end]
                right = lines[end:-1]
                wc = WordContext(self.re_word)
                front = wc.get_right_context(left) 
                back  = wc.get_left_context(right)
          return front, middle, back
                  
#===================================================================
# main:

l1 = '"I think that you have secrets from me, Julie.--You love," he went on\n'
l2 = 'quickly, as he saw the color rise to her face. "Oh! I hoped that you\n'
l3 = 'would stay with your old father until he died. I hoped to keep you\n'
re_word = "[\s,.!?;\-\"\']*(\w+\'\w+|\w+\-\w+|\w+)[\s,.!?;\-\"\']+"
tw = TextWindow('face',re_word)
print tw.buffer_full()
tw.insert(l1)
print tw.buffer_full()
tw.insert(l2)
print tw.buffer_full()
tw.insert(l3)
print tw.buffer_full()
front, middle, back = tw.search()
print "%s | %s | %s" % (front, middle, back)