excel-builder/src/Excel/SharedStrings.js

An easy way of building Excel files with javascript

"use strict";
var _ = require('lodash');
var util = require('./util');


/**
 * @module Excel/SharedStrings
 */
var sharedStrings = function () {
    this.strings = {};
    this.stringArray = [];
    this.id = _.uniqueId('SharedStrings');
};
_.extend(sharedStrings.prototype, {
    /**
     * Adds a string to the shared string file, and returns the ID of the
     * string which can be used to reference it in worksheets.
     *
     * @param string {String}
     * @return int
     */
    addString: function (string) {
        this.strings[string] = this.stringArray.length;
        this.stringArray[this.stringArray.length] = string;
        return this.strings[string];
    },

    exportData: function () {
        return this.strings;
    },

    toXML: function () {
        var doc = util.createXmlDoc(util.schemas.spreadsheetml, 'sst');
        var sharedStringTable = doc.documentElement;
        this.stringArray.reverse();
        var l = this.stringArray.length;
        sharedStringTable.setAttribute('count', l);
        sharedStringTable.setAttribute('uniqueCount', l);

        var template = doc.createElement('si');
        var templateValue = doc.createElement('t');
        templateValue.appendChild(doc.createTextNode('--placeholder--'));
        template.appendChild(templateValue);
        var strings = this.stringArray;

        while (l--) {
            var clone = template.cloneNode(true);
            clone.firstChild.firstChild.nodeValue = strings[l];
            sharedStringTable.appendChild(clone);
        }

        return doc;
    }
});
module.exports = sharedStrings;