kuromoji/src/viterbi/ViterbiNode.js

JavaScript implementation of Japanese morphological analyzer

/*
 * Copyright 2014 Takuya Asano
 * Copyright 2010-2014 Atilika Inc. and contributors
 *
 * 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.
 */

"use strict";

/**
 * ViterbiNode is a node of ViterbiLattice
 * @param {number} node_name Word ID
 * @param {number} node_cost Word cost to generate
 * @param {number} start_pos Start position from 1
 * @param {number} length Word length
 * @param {string} type Node type (KNOWN, UNKNOWN, BOS, EOS, ...)
 * @param {number} left_id Left context ID
 * @param {number} right_id Right context ID
 * @param {string} surface_form Surface form of this word
 * @constructor
 */
function ViterbiNode(node_name, node_cost, start_pos, length, type, left_id, right_id, surface_form) {
    this.name = node_name;
    this.cost = node_cost;
    this.start_pos = start_pos;
    this.length = length;
    this.left_id = left_id;
    this.right_id = right_id;
    this.prev = null;
    this.surface_form = surface_form;
    if (type === "BOS") {
        this.shortest_cost = 0;
    } else {
        this.shortest_cost = Number.MAX_VALUE;
    }
    this.type = type;
}

module.exports = ViterbiNode;