Source Code for Module nltk.chunk.api

 1  # Natural Language Toolkit: Chunk parsing API 
 2  # 
 3  # Copyright (C) 2001-2008 NLTK Project 
 4  # Author: Edward Loper <[email protected]> 
 5  #         Steven Bird <[email protected]> (minor additions) 
 6  # URL: <http://nltk.org> 
 7  # For license information, see LICENSE.TXT 
 8   
 9  ##////////////////////////////////////////////////////// 
10  ##  Chunk Parser Interface 
11  ##////////////////////////////////////////////////////// 
12   
13  from nltk.parse import ParserI 
14   
15 -class ChunkParserI(ParserI): 
16      """ 
17      A processing interface for identifying non-overlapping groups in 
18      unrestricted text.  Typically, chunk parsers are used to find base 
19      syntactic constituants, such as base noun phrases.  Unlike 
20      L{ParserI}, C{ChunkParserI} guarantees that the C{parse} method 
21      will always generate a parse. 
22      """ 
23 -    def parse(self, tokens): 
24          """ 
25          @return: the best chunk structure for the given tokens 
26          and return a tree. 
27           
28          @param tokens: The list of (word, tag) tokens to be chunked. 
29          @type tokens: C{list} of L{tuple} 
30          @rtype: L{Tree} 
31          """ 
32          assert 0, "ChunkParserI is an abstract interface" 
33