parser.py

# Copyright 2017 Johns Hopkins University. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================


from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals

import spacy

class Parser:
    """
    Create room for custom reparsing
    """
    
    def __init__(self):
        self.parser = spacy.load('en')
       
    def parse(self, sentence):
        return self.parser(sentence)
    

    def createDAG(self, parseTree):
        """
        navigate from root to child
        returns stack that can be traversed bottom up
        """

        stack = [sent.root for sent in parseTree.sents]
        for token in stack:
            stack.extend(list(token.children))
        return reversed(stack)