359 lines
12 KiB
JavaScript
359 lines
12 KiB
JavaScript
(function () {
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"use strict";
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angular.module('OpenSlidesApp.motions.lineNumbering', [])
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/**
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* Current limitations of this implementation:
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*
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* Only the following inline elements are supported:
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* - 'SPAN', 'A', 'EM', 'S', 'B', 'I', 'STRONG', 'U', 'BIG', 'SMALL', 'SUB', 'SUP', 'TT'
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*
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* Only other inline elements are allowed within inline elements.
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* No constructs like <a...><div></div></a> are allowed. CSS-attributes like 'display: block' are ignored.
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*/
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.service('lineNumberingService', function () {
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var ELEMENT_NODE = 1,
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TEXT_NODE = 3;
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this._currentInlineOffset = null;
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this._currentLineNumber = null;
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this._prependLineNumberToFirstText = false;
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this._isInlineElement = function (node) {
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var inlineElements = [
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'SPAN', 'A', 'EM', 'S', 'B', 'I', 'STRONG', 'U', 'BIG', 'SMALL', 'SUB', 'SUP', 'TT'
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];
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return (inlineElements.indexOf(node.nodeName) > -1);
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};
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this._isOsLineBreakNode = function (node) {
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var isLineBreak = false;
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if (node && node.nodeType === ELEMENT_NODE && node.nodeName == 'BR' && node.hasAttribute('class')) {
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var classes = node.getAttribute('class').split(' ');
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if (classes.indexOf('os-line-break') > -1) {
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isLineBreak = true;
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}
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}
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return isLineBreak;
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};
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this._isOsLineNumberNode = function (node) {
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var isLineNumber = false;
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if (node && node.nodeType === ELEMENT_NODE && node.nodeName == 'SPAN' && node.hasAttribute('class')) {
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var classes = node.getAttribute('class').split(' ');
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if (classes.indexOf('os-line-number') > -1) {
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isLineNumber = true;
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}
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}
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return isLineNumber;
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};
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this._createLineBreak = function () {
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var br = document.createElement('br');
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br.setAttribute('class', 'os-line-break');
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return br;
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};
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this._createLineNumber = function () {
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var node = document.createElement('span');
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var lineNumber = this._currentLineNumber;
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this._currentLineNumber++;
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node.setAttribute('class', 'os-line-number line-number-' + lineNumber);
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node.setAttribute('data-line-number', lineNumber + '');
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node.setAttribute('contenteditable', 'false');
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node.innerHTML = ' '; // Prevent tinymce from stripping out empty span's
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return node;
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};
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/**
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* Splits a TEXT_NODE into an array of TEXT_NODEs and BR-Elements separating them into lines.
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* Each line has a maximum length of 'length', with one exception: spaces are accepted to exceed the length.
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* Otherwise the string is split by the last space or dash in the line.
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*
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* @param node
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* @param length
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* @returns Array
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* @private
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*/
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this._textNodeToLines = function (node, length) {
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var out = [],
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currLineStart = 0,
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i = 0,
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firstTextNode = true,
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lastBreakableIndex = null,
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service = this;
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var addLine = function (text) {
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var newNode = document.createTextNode(text);
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if (firstTextNode) {
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firstTextNode = false;
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} else {
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out.push(service._createLineBreak());
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out.push(service._createLineNumber());
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}
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out.push(newNode);
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};
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if (node.nodeValue == "\n") {
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out.push(node);
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} else {
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// This happens if a previous inline element exactly stretches to the end of the line
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if (this._currentInlineOffset >= length) {
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out.push(service._createLineBreak());
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out.push(service._createLineNumber());
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this._currentInlineOffset = 0;
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} else if (this._prependLineNumberToFirstText) {
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out.push(service._createLineNumber());
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}
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this._prependLineNumberToFirstText = false;
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while (i < node.nodeValue.length) {
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var lineBreakAt = null;
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if (this._currentInlineOffset >= length) {
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if (lastBreakableIndex !== null) {
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lineBreakAt = lastBreakableIndex;
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} else {
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lineBreakAt = i - 1;
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}
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}
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if (lineBreakAt !== null && node.nodeValue[i] != ' ') {
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var currLine = node.nodeValue.substring(currLineStart, lineBreakAt + 1);
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addLine(currLine);
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currLineStart = lineBreakAt + 1;
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this._currentInlineOffset = i - lineBreakAt - 1;
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lastBreakableIndex = null;
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}
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if (node.nodeValue[i] == ' ' || node.nodeValue[i] == '-') {
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lastBreakableIndex = i;
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}
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this._currentInlineOffset++;
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i++;
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}
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addLine(node.nodeValue.substring(currLineStart));
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}
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return out;
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};
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/**
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* Moves line breaking and line numbering markup before inline elements
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*
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* @param innerNode
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* @param outerNode
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* @private
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*/
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this._moveLeadingLineBreaksToOuterNode = function (innerNode, outerNode) {
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if (this._isInlineElement(innerNode)) {
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if (this._isOsLineBreakNode(innerNode.firstChild)) {
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var br = innerNode.firstChild;
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innerNode.removeChild(br);
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outerNode.appendChild(br);
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}
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if (this._isOsLineNumberNode(innerNode.firstChild)) {
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var span = innerNode.firstChild;
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innerNode.removeChild(span);
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outerNode.appendChild(span);
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}
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}
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};
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this._lengthOfFirstInlineWord = function (node) {
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if (!node.firstChild) {
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return 0;
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}
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if (node.firstChild.nodeType == TEXT_NODE) {
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var parts = node.firstChild.nodeValue.split(' ');
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return parts[0].length;
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} else {
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return this._lengthOfFirstInlineWord(node.firstChild);
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}
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};
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this._insertLineNumbersToInlineNode = function (node, length) {
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var oldChildren = [], i;
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for (i = 0; i < node.childNodes.length; i++) {
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oldChildren.push(node.childNodes[i]);
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}
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while (node.firstChild) {
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node.removeChild(node.firstChild);
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}
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for (i = 0; i < oldChildren.length; i++) {
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if (oldChildren[i].nodeType == TEXT_NODE) {
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var ret = this._textNodeToLines(oldChildren[i], length);
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for (var j = 0; j < ret.length; j++) {
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node.appendChild(ret[j]);
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}
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} else if (oldChildren[i].nodeType == ELEMENT_NODE) {
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var firstword = this._lengthOfFirstInlineWord(oldChildren[i]),
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overlength = ((this._currentInlineOffset + firstword) > length && this._currentInlineOffset > 0);
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if (overlength && this._isInlineElement(oldChildren[i])) {
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this._currentInlineOffset = 0;
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node.appendChild(this._createLineBreak());
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node.appendChild(this._createLineNumber());
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}
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var changedNode = this._insertLineNumbersToNode(oldChildren[i], length);
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this._moveLeadingLineBreaksToOuterNode(changedNode, node);
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node.appendChild(changedNode);
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} else {
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throw 'Unknown nodeType: ' + i + ': ' + oldChildren[i];
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}
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}
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return node;
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};
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this._calcBlockNodeLength = function (node, oldLength) {
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var newLength = oldLength;
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switch (node.nodeName) {
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case 'LI':
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newLength -= 5;
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break;
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case 'BLOCKQUOTE':
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newLength -= 20;
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break;
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case 'DIV':
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case 'P':
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var styles = node.getAttribute("style"),
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padding = 0;
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if (styles) {
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var leftpad = styles.split("padding-left:");
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if (leftpad.length > 1) {
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leftpad = parseInt(leftpad[1]);
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padding += leftpad;
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}
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var rightpad = styles.split("padding-right:");
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if (rightpad.length > 1) {
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rightpad = parseInt(rightpad[1]);
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padding += rightpad;
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}
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newLength -= (padding / 5);
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}
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break;
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case 'H1':
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newLength *= 0.5;
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break;
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case 'H2':
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newLength *= 0.66;
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break;
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case 'H3':
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newLength *= 0.66;
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break;
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}
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return Math.ceil(newLength);
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};
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this._insertLineNumbersToBlockNode = function (node, length) {
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this._currentInlineOffset = 0;
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this._prependLineNumberToFirstText = true;
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var oldChildren = [], i;
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for (i = 0; i < node.childNodes.length; i++) {
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oldChildren.push(node.childNodes[i]);
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}
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while (node.firstChild) {
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node.removeChild(node.firstChild);
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}
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for (i = 0; i < oldChildren.length; i++) {
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if (oldChildren[i].nodeType == TEXT_NODE) {
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var ret = this._textNodeToLines(oldChildren[i], length);
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for (var j = 0; j < ret.length; j++) {
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node.appendChild(ret[j]);
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}
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} else if (oldChildren[i].nodeType == ELEMENT_NODE) {
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var firstword = this._lengthOfFirstInlineWord(oldChildren[i]),
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overlength = ((this._currentInlineOffset + firstword) > length && this._currentInlineOffset > 0);
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if (overlength && this._isInlineElement(oldChildren[i])) {
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this._currentInlineOffset = 0;
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node.appendChild(this._createLineBreak());
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node.appendChild(this._createLineNumber());
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}
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var changedNode = this._insertLineNumbersToNode(oldChildren[i], length);
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this._moveLeadingLineBreaksToOuterNode(changedNode, node);
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node.appendChild(changedNode);
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} else {
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throw 'Unknown nodeType: ' + i + ': ' + oldChildren[i];
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}
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}
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this._currentInlineOffset = 0;
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this._prependLineNumberToFirstText = true;
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return node;
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};
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this._insertLineNumbersToNode = function (node, length) {
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if (node.nodeType !== ELEMENT_NODE) {
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throw 'This method may only be called for ELEMENT-nodes: ' + node.nodeValue;
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}
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if (this._isInlineElement(node)) {
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return this._insertLineNumbersToInlineNode(node, length);
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} else {
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var newLength = this._calcBlockNodeLength(node, length);
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return this._insertLineNumbersToBlockNode(node, newLength);
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}
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};
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this._stripLineNumbers = function (node) {
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for (var i = 0; i < node.childNodes.length; i++) {
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if (this._isOsLineBreakNode(node.childNodes[i]) || this._isOsLineNumberNode(node.childNodes[i])) {
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node.removeChild(node.childNodes[i]);
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i--;
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} else {
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this._stripLineNumbers(node.childNodes[i]);
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}
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}
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};
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this._nodesToHtml = function (nodes) {
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var root = document.createElement('div');
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for (var i in nodes) {
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if (nodes.hasOwnProperty(i)) {
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root.appendChild(nodes[i]);
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}
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}
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return root.innerHTML;
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};
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this.insertLineNumbersNode = function (html, lineLength) {
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var root = document.createElement('div');
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root.innerHTML = html;
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this._currentInlineOffset = 0;
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this._currentLineNumber = 1;
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this._prependLineNumberToFirstText = true;
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return this._insertLineNumbersToNode(root, lineLength);
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};
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this.insertLineNumbers = function (html, lineLength) {
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var newRoot = this.insertLineNumbersNode(html, lineLength);
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return newRoot.innerHTML;
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};
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this.stripLineNumbers = function (html) {
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var root = document.createElement('div');
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root.innerHTML = html;
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this._stripLineNumbers(root);
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return root.innerHTML;
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};
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});
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}());
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