Class PNPChunk

pattern/text/tree.py:462–501

#--- PNP CHUNK -------------------------------------------------------------------------------------

class PNPChunk(Chunk):

    def __init__(self, *args, **kwargs):
        """ A chunk of chunks that make up a prepositional noun phrase (i.e., PP + NP).
            When the output of the parser includes PP-attachment,
            PNPChunck.anchor will yield the chunk that is clarified by the preposition.
            For example: "the cat went [for the mouse] [with its claws]":
            - [went] what? => for the mouse,
            - [went] how? => with its claws.
        """
        self.anchor     = None # The anchor chunk (e.g., "for the mouse" => "went").
        self.chunks     = []   # List of chunks in the prepositional noun phrase.
        Chunk.__init__(self, *args, **kwargs)

    def append(self, word):
        self.words.append(word)
        word.pnp = self
        if word.chunk is not None:
            word.chunk.pnp = self
            if word.chunk not in self.chunks:
                self.chunks.append(word.chunk)

    @property
    def preposition(self):
        """ Yields the first chunk in the prepositional noun phrase, usually a PP-chunk.
            PP-chunks contain words such as "for", "with", "in", ...
        """
        return self.chunks[0]
        
    pp = preposition

    @property
    def phrases(self):
        return self.chunks

    def guess_anchor(self):
        """ Returns an anchor chunk for this prepositional noun phrase (without a PP-attacher).
            Often, the nearest verb phrase is a good candidate.
        """
        return self.nearest("VP")

#--- CONJUNCTION -----------------------------------------------------------------------------------