kuromoji/src/dict/builder/ConnectionCostsBuilder.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";

var ConnectionCosts = require("../ConnectionCosts");

/**
 * Builder class for constructing ConnectionCosts object
 * @constructor
 */
function ConnectionCostsBuilder() {
    this.lines = 0;
    this.connection_cost = null;
}

ConnectionCostsBuilder.prototype.putLine = function (line) {
    if (this.lines === 0) {
        var dimensions = line.split(" ");
        var forward_dimension = dimensions[0];
        var backward_dimension = dimensions[1];

        if (forward_dimension < 0 || backward_dimension < 0) {
            throw "Parse error of matrix.def";
        }

        this.connection_cost = new ConnectionCosts(forward_dimension, backward_dimension);
        this.lines++;
        return this;
    }

    var costs = line.split(" ");

    if (costs.length !== 3) {
        return this;
    }

    var forward_id = parseInt(costs[0]);
    var backward_id = parseInt(costs[1]);
    var cost = parseInt(costs[2]);

    if (forward_id < 0 || backward_id < 0 || !isFinite(forward_id) || !isFinite(backward_id) ||
        this.connection_cost.forward_dimension <= forward_id || this.connection_cost.backward_dimension <= backward_id) {
        throw "Parse error of matrix.def";
    }

    this.connection_cost.put(forward_id, backward_id, cost);
    this.lines++;
    return this;
};

ConnectionCostsBuilder.prototype.build = function () {
    return this.connection_cost;
};

module.exports = ConnectionCostsBuilder;