node-webodf
Version:
WebODF - JavaScript Document Engine http://webodf.org/
91 lines (85 loc) • 3.15 kB
JavaScript
/**
* Copyright (C) 2013 KO GmbH <copyright@kogmbh.com>
*
* @licstart
* This file is part of WebODF.
*
* WebODF is free software: you can redistribute it and/or modify it
* under the terms of the GNU Affero General Public License (GNU AGPL)
* as published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* WebODF is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with WebODF. If not, see <http://www.gnu.org/licenses/>.
* @licend
*
* @source: http://www.webodf.org/
* @source: https://github.com/kogmbh/WebODF/
*/
/*global odf, xmldom, Node, NodeFilter, runtime*/
/**
* Serializes a provided node structure into plain text, eliminating everything
* specified by the optional filter element.
* This will attempt to generate reasonable plain text output including line-breaks
* at new paragraphs
* @constructor
*/
odf.TextSerializer = function TextSerializer() {
"use strict";
var self = this,
odfUtils = odf.OdfUtils;
/**
* @param {!Node} node
* @return {!string}
*/
function serializeNode(node) {
var s = "",
accept = (self.filter) ? self.filter.acceptNode(node) : NodeFilter.FILTER_ACCEPT,
nodeType = node.nodeType,
child;
if ((accept === NodeFilter.FILTER_ACCEPT || accept === NodeFilter.FILTER_SKIP) &&
odfUtils.isTextContentContainingNode(node)) {
child = node.firstChild;
while (child) {
s += serializeNode(child);
child = child.nextSibling;
}
}
if (accept === NodeFilter.FILTER_ACCEPT) {
if (nodeType === Node.ELEMENT_NODE && odfUtils.isParagraph(node)) {
s += "\n";
} else if (nodeType === Node.TEXT_NODE && node.textContent) {
s += node.textContent;
}
}
return s;
}
/**
* @type {xmldom.LSSerializerFilter}
*/
this.filter = null;
/**
* @param {?Node} node
* @return {!string}
*/
this.writeToString = function (node) {
var plainText;
if (!node) {
return "";
}
plainText = serializeNode(node);
if (plainText[plainText.length - 1] === "\n") {
// By the serializing logic, the selection <p>text</p> would generate "text\n"
// This is slightly unexpected though, as partially selecting two paragraphs (<p>p1</p><p>p2</p>)
// the user would expect the text to be "p1\np2"
// Easiest way to meet this expectation is to throw away the last new line (if present)
plainText = plainText.substr(0, plainText.length - 1);
}
return plainText;
};
};