/* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ this.EXPORTED_SYMBOLS = ["WebVTT"]; /** * Code below is vtt.js the JS WebVTT implementation. * Current source code can be found at http://github.com/mozilla/vtt.js * * Code taken from commit b89bfd06cd788a68c67e03f44561afe833db0849 */ /** * Copyright 2013 vtt.js 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. */ (function(global) { var _objCreate = Object.create || (function() { function F() {} return function(o) { if (arguments.length !== 1) { throw new Error('Object.create shim only accepts one parameter.'); } F.prototype = o; return new F(); }; })(); // Creates a new ParserError object from an errorData object. The errorData // object should have default code and message properties. The default message // property can be overriden by passing in a message parameter. // See ParsingError.Errors below for acceptable errors. function ParsingError(errorData, message) { this.name = "ParsingError"; this.code = errorData.code; this.message = message || errorData.message; } ParsingError.prototype = _objCreate(Error.prototype); ParsingError.prototype.constructor = ParsingError; // ParsingError metadata for acceptable ParsingErrors. ParsingError.Errors = { BadSignature: { code: 0, message: "Malformed WebVTT signature." }, BadTimeStamp: { code: 1, message: "Malformed time stamp." } }; // See spec, https://w3c.github.io/webvtt/#collect-a-webvtt-timestamp. function collectTimeStamp(input) { function computeSeconds(h, m, s, f) { if (m > 59 || s > 59) { return null; } // The attribute of the milli-seconds can only be three digits. if (f.length !== 3) { return null; } return (h | 0) * 3600 + (m | 0) * 60 + (s | 0) + (f | 0) / 1000; } var timestamp = input.match(/^(\d+:)?(\d{2}):(\d{2})\.(\d+)/); if (!timestamp || timestamp.length !== 5) { return null; } let hours = timestamp[1]? timestamp[1].replace(":", "") : 0; let minutes = timestamp[2]; let seconds = timestamp[3]; let milliSeconds = timestamp[4]; return computeSeconds(hours, minutes, seconds, milliSeconds); } // A settings object holds key/value pairs and will ignore anything but the first // assignment to a specific key. function Settings() { this.values = _objCreate(null); } Settings.prototype = { set: function(k, v) { if (v !== "") { this.values[k] = v; } }, // Return the value for a key, or a default value. // If 'defaultKey' is passed then 'dflt' is assumed to be an object with // a number of possible default values as properties where 'defaultKey' is // the key of the property that will be chosen; otherwise it's assumed to be // a single value. get: function(k, dflt, defaultKey) { if (defaultKey) { return this.has(k) ? this.values[k] : dflt[defaultKey]; } return this.has(k) ? this.values[k] : dflt; }, // Check whether we have a value for a key. has: function(k) { return k in this.values; }, // Accept a setting if its one of the given alternatives. alt: function(k, v, a) { for (var n = 0; n < a.length; ++n) { if (v === a[n]) { this.set(k, v); break; } } }, // Accept a setting if its a valid digits value (int or float) digitsValue: function(k, v) { if (/^-0+(\.[0]*)?$/.test(v)) { // special case for -0.0 this.set(k, 0.0); } else if (/^-?\d+(\.[\d]*)?$/.test(v)) { this.set(k, parseFloat(v)); } }, // Accept a setting if its a valid percentage. percent: function(k, v) { var m; if ((m = v.match(/^([\d]{1,3})(\.[\d]*)?%$/))) { v = parseFloat(v); if (v >= 0 && v <= 100) { this.set(k, v); return true; } } return false; } }; // Helper function to parse input into groups separated by 'groupDelim', and // interprete each group as a key/value pair separated by 'keyValueDelim'. function parseOptions(input, callback, keyValueDelim, groupDelim) { var groups = groupDelim ? input.split(groupDelim) : [input]; for (var i in groups) { if (typeof groups[i] !== "string") { continue; } var kv = groups[i].split(keyValueDelim); if (kv.length !== 2) { continue; } var k = kv[0]; var v = kv[1]; callback(k, v); } } function parseCue(input, cue, regionList) { // Remember the original input if we need to throw an error. var oInput = input; // 4.1 WebVTT timestamp function consumeTimeStamp() { var ts = collectTimeStamp(input); if (ts === null) { throw new ParsingError(ParsingError.Errors.BadTimeStamp, "Malformed timestamp: " + oInput); } // Remove time stamp from input. input = input.replace(/^[^\s\uFFFDa-zA-Z-]+/, ""); return ts; } // 4.4.2 WebVTT cue settings function consumeCueSettings(input, cue) { var settings = new Settings(); parseOptions(input, function (k, v) { switch (k) { case "region": // Find the last region we parsed with the same region id. for (var i = regionList.length - 1; i >= 0; i--) { if (regionList[i].id === v) { settings.set(k, regionList[i].region); break; } } break; case "vertical": settings.alt(k, v, ["rl", "lr"]); break; case "line": var vals = v.split(","), vals0 = vals[0]; settings.digitsValue(k, vals0); settings.percent(k, vals0) ? settings.set("snapToLines", false) : null; settings.alt(k, vals0, ["auto"]); if (vals.length === 2) { settings.alt("lineAlign", vals[1], ["start", "center", "end"]); } break; case "position": vals = v.split(","); settings.percent(k, vals[0]); if (vals.length === 2) { settings.alt("positionAlign", vals[1], ["line-left", "center", "line-right", "auto"]); } break; case "size": settings.percent(k, v); break; case "align": settings.alt(k, v, ["start", "center", "end", "left", "right"]); break; } }, /:/, /\s/); // Apply default values for any missing fields. cue.region = settings.get("region", null); cue.vertical = settings.get("vertical", ""); cue.line = settings.get("line", "auto"); cue.lineAlign = settings.get("lineAlign", "start"); cue.snapToLines = settings.get("snapToLines", true); cue.size = settings.get("size", 100); cue.align = settings.get("align", "center"); cue.position = settings.get("position", "auto"); cue.positionAlign = settings.get("positionAlign", "center"); } function skipWhitespace() { input = input.replace(/^[ \f\n\r\t]+/, ""); } // 4.1 WebVTT cue timings. skipWhitespace(); cue.startTime = consumeTimeStamp(); // (1) collect cue start time skipWhitespace(); if (input.substr(0, 3) !== "-->") { // (3) next characters must match "-->" throw new ParsingError(ParsingError.Errors.BadTimeStamp, "Malformed time stamp (time stamps must be separated by '-->'): " + oInput); } input = input.substr(3); skipWhitespace(); cue.endTime = consumeTimeStamp(); // (5) collect cue end time // 4.1 WebVTT cue settings list. skipWhitespace(); consumeCueSettings(input, cue); } function onlyContainsWhiteSpaces(input) { return /^[ \f\n\r\t]+$/.test(input); } function containsTimeDirectionSymbol(input) { return input.indexOf("-->") !== -1; } function maybeIsTimeStampFormat(input) { return /^\s*(\d+:)?(\d{2}):(\d{2})\.(\d+)\s*-->\s*(\d+:)?(\d{2}):(\d{2})\.(\d+)\s*/.test(input); } var ESCAPE = { "&": "&", "<": "<", ">": ">", "‎": "\u200e", "‏": "\u200f", " ": "\u00a0" }; var TAG_NAME = { c: "span", i: "i", b: "b", u: "u", ruby: "ruby", rt: "rt", v: "span", lang: "span" }; var TAG_ANNOTATION = { v: "title", lang: "lang" }; var NEEDS_PARENT = { rt: "ruby" }; // Parse content into a document fragment. function parseContent(window, input) { function nextToken() { // Check for end-of-string. if (!input) { return null; } // Consume 'n' characters from the input. function consume(result) { input = input.substr(result.length); return result; } var m = input.match(/^([^<]*)(<[^>]+>?)?/); // If there is some text before the next tag, return it, otherwise return // the tag. return consume(m[1] ? m[1] : m[2]); } // Unescape a string 's'. function unescape1(e) { return ESCAPE[e]; } function unescape(s) { while ((m = s.match(/&(amp|lt|gt|lrm|rlm|nbsp);/))) { s = s.replace(m[0], unescape1); } return s; } function shouldAdd(current, element) { return !NEEDS_PARENT[element.localName] || NEEDS_PARENT[element.localName] === current.localName; } // Create an element for this tag. function createElement(type, annotation) { var tagName = TAG_NAME[type]; if (!tagName) { return null; } var element = window.document.createElement(tagName); element.localName = tagName; var name = TAG_ANNOTATION[type]; if (name && annotation) { element[name] = annotation.trim(); } return element; } var rootDiv = window.document.createElement("div"), current = rootDiv, t, tagStack = []; while ((t = nextToken()) !== null) { if (t[0] === '<') { if (t[1] === "/") { // If the closing tag matches, move back up to the parent node. if (tagStack.length && tagStack[tagStack.length - 1] === t.substr(2).replace(">", "")) { tagStack.pop(); current = current.parentNode; } // Otherwise just ignore the end tag. continue; } var ts = collectTimeStamp(t.substr(1, t.length - 2)); var node; if (ts) { // Timestamps are lead nodes as well. node = window.document.createProcessingInstruction("timestamp", ts); current.appendChild(node); continue; } var m = t.match(/^<([^.\s/0-9>]+)(\.[^\s\\>]+)?([^>\\]+)?(\\?)>?$/); // If we can't parse the tag, skip to the next tag. if (!m) { continue; } // Try to construct an element, and ignore the tag if we couldn't. node = createElement(m[1], m[3]); if (!node) { continue; } // Determine if the tag should be added based on the context of where it // is placed in the cuetext. if (!shouldAdd(current, node)) { continue; } // Set the class list (as a list of classes, separated by space). if (m[2]) { node.className = m[2].substr(1).replace('.', ' '); } // Append the node to the current node, and enter the scope of the new // node. tagStack.push(m[1]); current.appendChild(node); current = node; continue; } // Text nodes are leaf nodes. current.appendChild(window.document.createTextNode(unescape(t))); } return rootDiv; } // This is a list of all the Unicode characters that have a strong // right-to-left category. What this means is that these characters are // written right-to-left for sure. It was generated by pulling all the strong // right-to-left characters out of the Unicode data table. That table can // found at: http://www.unicode.org/Public/UNIDATA/UnicodeData.txt var strongRTLChars = [0x05BE, 0x05C0, 0x05C3, 0x05C6, 0x05D0, 0x05D1, 0x05D2, 0x05D3, 0x05D4, 0x05D5, 0x05D6, 0x05D7, 0x05D8, 0x05D9, 0x05DA, 0x05DB, 0x05DC, 0x05DD, 0x05DE, 0x05DF, 0x05E0, 0x05E1, 0x05E2, 0x05E3, 0x05E4, 0x05E5, 0x05E6, 0x05E7, 0x05E8, 0x05E9, 0x05EA, 0x05F0, 0x05F1, 0x05F2, 0x05F3, 0x05F4, 0x0608, 0x060B, 0x060D, 0x061B, 0x061E, 0x061F, 0x0620, 0x0621, 0x0622, 0x0623, 0x0624, 0x0625, 0x0626, 0x0627, 0x0628, 0x0629, 0x062A, 0x062B, 0x062C, 0x062D, 0x062E, 0x062F, 0x0630, 0x0631, 0x0632, 0x0633, 0x0634, 0x0635, 0x0636, 0x0637, 0x0638, 0x0639, 0x063A, 0x063B, 0x063C, 0x063D, 0x063E, 0x063F, 0x0640, 0x0641, 0x0642, 0x0643, 0x0644, 0x0645, 0x0646, 0x0647, 0x0648, 0x0649, 0x064A, 0x066D, 0x066E, 0x066F, 0x0671, 0x0672, 0x0673, 0x0674, 0x0675, 0x0676, 0x0677, 0x0678, 0x0679, 0x067A, 0x067B, 0x067C, 0x067D, 0x067E, 0x067F, 0x0680, 0x0681, 0x0682, 0x0683, 0x0684, 0x0685, 0x0686, 0x0687, 0x0688, 0x0689, 0x068A, 0x068B, 0x068C, 0x068D, 0x068E, 0x068F, 0x0690, 0x0691, 0x0692, 0x0693, 0x0694, 0x0695, 0x0696, 0x0697, 0x0698, 0x0699, 0x069A, 0x069B, 0x069C, 0x069D, 0x069E, 0x069F, 0x06A0, 0x06A1, 0x06A2, 0x06A3, 0x06A4, 0x06A5, 0x06A6, 0x06A7, 0x06A8, 0x06A9, 0x06AA, 0x06AB, 0x06AC, 0x06AD, 0x06AE, 0x06AF, 0x06B0, 0x06B1, 0x06B2, 0x06B3, 0x06B4, 0x06B5, 0x06B6, 0x06B7, 0x06B8, 0x06B9, 0x06BA, 0x06BB, 0x06BC, 0x06BD, 0x06BE, 0x06BF, 0x06C0, 0x06C1, 0x06C2, 0x06C3, 0x06C4, 0x06C5, 0x06C6, 0x06C7, 0x06C8, 0x06C9, 0x06CA, 0x06CB, 0x06CC, 0x06CD, 0x06CE, 0x06CF, 0x06D0, 0x06D1, 0x06D2, 0x06D3, 0x06D4, 0x06D5, 0x06E5, 0x06E6, 0x06EE, 0x06EF, 0x06FA, 0x06FB, 0x06FC, 0x06FD, 0x06FE, 0x06FF, 0x0700, 0x0701, 0x0702, 0x0703, 0x0704, 0x0705, 0x0706, 0x0707, 0x0708, 0x0709, 0x070A, 0x070B, 0x070C, 0x070D, 0x070F, 0x0710, 0x0712, 0x0713, 0x0714, 0x0715, 0x0716, 0x0717, 0x0718, 0x0719, 0x071A, 0x071B, 0x071C, 0x071D, 0x071E, 0x071F, 0x0720, 0x0721, 0x0722, 0x0723, 0x0724, 0x0725, 0x0726, 0x0727, 0x0728, 0x0729, 0x072A, 0x072B, 0x072C, 0x072D, 0x072E, 0x072F, 0x074D, 0x074E, 0x074F, 0x0750, 0x0751, 0x0752, 0x0753, 0x0754, 0x0755, 0x0756, 0x0757, 0x0758, 0x0759, 0x075A, 0x075B, 0x075C, 0x075D, 0x075E, 0x075F, 0x0760, 0x0761, 0x0762, 0x0763, 0x0764, 0x0765, 0x0766, 0x0767, 0x0768, 0x0769, 0x076A, 0x076B, 0x076C, 0x076D, 0x076E, 0x076F, 0x0770, 0x0771, 0x0772, 0x0773, 0x0774, 0x0775, 0x0776, 0x0777, 0x0778, 0x0779, 0x077A, 0x077B, 0x077C, 0x077D, 0x077E, 0x077F, 0x0780, 0x0781, 0x0782, 0x0783, 0x0784, 0x0785, 0x0786, 0x0787, 0x0788, 0x0789, 0x078A, 0x078B, 0x078C, 0x078D, 0x078E, 0x078F, 0x0790, 0x0791, 0x0792, 0x0793, 0x0794, 0x0795, 0x0796, 0x0797, 0x0798, 0x0799, 0x079A, 0x079B, 0x079C, 0x079D, 0x079E, 0x079F, 0x07A0, 0x07A1, 0x07A2, 0x07A3, 0x07A4, 0x07A5, 0x07B1, 0x07C0, 0x07C1, 0x07C2, 0x07C3, 0x07C4, 0x07C5, 0x07C6, 0x07C7, 0x07C8, 0x07C9, 0x07CA, 0x07CB, 0x07CC, 0x07CD, 0x07CE, 0x07CF, 0x07D0, 0x07D1, 0x07D2, 0x07D3, 0x07D4, 0x07D5, 0x07D6, 0x07D7, 0x07D8, 0x07D9, 0x07DA, 0x07DB, 0x07DC, 0x07DD, 0x07DE, 0x07DF, 0x07E0, 0x07E1, 0x07E2, 0x07E3, 0x07E4, 0x07E5, 0x07E6, 0x07E7, 0x07E8, 0x07E9, 0x07EA, 0x07F4, 0x07F5, 0x07FA, 0x0800, 0x0801, 0x0802, 0x0803, 0x0804, 0x0805, 0x0806, 0x0807, 0x0808, 0x0809, 0x080A, 0x080B, 0x080C, 0x080D, 0x080E, 0x080F, 0x0810, 0x0811, 0x0812, 0x0813, 0x0814, 0x0815, 0x081A, 0x0824, 0x0828, 0x0830, 0x0831, 0x0832, 0x0833, 0x0834, 0x0835, 0x0836, 0x0837, 0x0838, 0x0839, 0x083A, 0x083B, 0x083C, 0x083D, 0x083E, 0x0840, 0x0841, 0x0842, 0x0843, 0x0844, 0x0845, 0x0846, 0x0847, 0x0848, 0x0849, 0x084A, 0x084B, 0x084C, 0x084D, 0x084E, 0x084F, 0x0850, 0x0851, 0x0852, 0x0853, 0x0854, 0x0855, 0x0856, 0x0857, 0x0858, 0x085E, 0x08A0, 0x08A2, 0x08A3, 0x08A4, 0x08A5, 0x08A6, 0x08A7, 0x08A8, 0x08A9, 0x08AA, 0x08AB, 0x08AC, 0x200F, 0xFB1D, 0xFB1F, 0xFB20, 0xFB21, 0xFB22, 0xFB23, 0xFB24, 0xFB25, 0xFB26, 0xFB27, 0xFB28, 0xFB2A, 0xFB2B, 0xFB2C, 0xFB2D, 0xFB2E, 0xFB2F, 0xFB30, 0xFB31, 0xFB32, 0xFB33, 0xFB34, 0xFB35, 0xFB36, 0xFB38, 0xFB39, 0xFB3A, 0xFB3B, 0xFB3C, 0xFB3E, 0xFB40, 0xFB41, 0xFB43, 0xFB44, 0xFB46, 0xFB47, 0xFB48, 0xFB49, 0xFB4A, 0xFB4B, 0xFB4C, 0xFB4D, 0xFB4E, 0xFB4F, 0xFB50, 0xFB51, 0xFB52, 0xFB53, 0xFB54, 0xFB55, 0xFB56, 0xFB57, 0xFB58, 0xFB59, 0xFB5A, 0xFB5B, 0xFB5C, 0xFB5D, 0xFB5E, 0xFB5F, 0xFB60, 0xFB61, 0xFB62, 0xFB63, 0xFB64, 0xFB65, 0xFB66, 0xFB67, 0xFB68, 0xFB69, 0xFB6A, 0xFB6B, 0xFB6C, 0xFB6D, 0xFB6E, 0xFB6F, 0xFB70, 0xFB71, 0xFB72, 0xFB73, 0xFB74, 0xFB75, 0xFB76, 0xFB77, 0xFB78, 0xFB79, 0xFB7A, 0xFB7B, 0xFB7C, 0xFB7D, 0xFB7E, 0xFB7F, 0xFB80, 0xFB81, 0xFB82, 0xFB83, 0xFB84, 0xFB85, 0xFB86, 0xFB87, 0xFB88, 0xFB89, 0xFB8A, 0xFB8B, 0xFB8C, 0xFB8D, 0xFB8E, 0xFB8F, 0xFB90, 0xFB91, 0xFB92, 0xFB93, 0xFB94, 0xFB95, 0xFB96, 0xFB97, 0xFB98, 0xFB99, 0xFB9A, 0xFB9B, 0xFB9C, 0xFB9D, 0xFB9E, 0xFB9F, 0xFBA0, 0xFBA1, 0xFBA2, 0xFBA3, 0xFBA4, 0xFBA5, 0xFBA6, 0xFBA7, 0xFBA8, 0xFBA9, 0xFBAA, 0xFBAB, 0xFBAC, 0xFBAD, 0xFBAE, 0xFBAF, 0xFBB0, 0xFBB1, 0xFBB2, 0xFBB3, 0xFBB4, 0xFBB5, 0xFBB6, 0xFBB7, 0xFBB8, 0xFBB9, 0xFBBA, 0xFBBB, 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node.textContent || node.innerText; if (text) { // TODO: This should match all unicode type B characters (paragraph // separator characters). See issue #115. var m = text.match(/^.*(\n|\r)/); if (m) { nodeStack.length = 0; return m[0]; } return text; } if (node.tagName === "ruby") { return nextTextNode(nodeStack); } if (node.childNodes) { pushNodes(nodeStack, node); return nextTextNode(nodeStack); } } pushNodes(nodeStack, cueDiv); while ((text = nextTextNode(nodeStack))) { for (var i = 0; i < text.length; i++) { charCode = text.charCodeAt(i); for (var j = 0; j < strongRTLChars.length; j++) { if (strongRTLChars[j] === charCode) { return "rtl"; } } } } return "ltr"; } function StyleBox() { } // Apply styles to a div. If there is no div passed then it defaults to the // div on 'this'. StyleBox.prototype.applyStyles = function(styles, div) { div = div || this.div; for (var prop in styles) { if (styles.hasOwnProperty(prop)) { div.style[prop] = styles[prop]; } } }; StyleBox.prototype.formatStyle = function(val, unit) { return val === 0 ? 0 : val + unit; }; // Constructs the computed display state of the cue (a div). Places the div // into the overlay which should be a block level element (usually a div). function CueStyleBox(window, cue, styleOptions) { var isIE8 = (typeof navigator !== "undefined") && (/MSIE\s8\.0/).test(navigator.userAgent); var color = "rgba(255, 255, 255, 1)"; var backgroundColor = "rgba(0, 0, 0, 0.8)"; if (isIE8) { color = "rgb(255, 255, 255)"; backgroundColor = "rgb(0, 0, 0)"; } StyleBox.call(this); this.cue = cue; // Parse our cue's text into a DOM tree rooted at 'cueDiv'. This div will // have inline positioning and will function as the cue background box. this.cueDiv = parseContent(window, cue.text); var styles = { color: color, backgroundColor: backgroundColor, position: "relative", left: 0, right: 0, top: 0, bottom: 0, display: "inline" }; if (!isIE8) { styles.writingMode = cue.vertical === "" ? "horizontal-tb" : cue.vertical === "lr" ? "vertical-lr" : "vertical-rl"; styles.unicodeBidi = "plaintext"; } this.applyStyles(styles, this.cueDiv); // Create an absolutely positioned div that will be used to position the cue // div. this.div = window.document.createElement("div"); styles = { textAlign: cue.align, font: styleOptions.font, whiteSpace: "pre-line", position: "absolute" }; if (!isIE8) { styles.direction = determineBidi(this.cueDiv); styles.writingMode = cue.vertical === "" ? "horizontal-tb" : cue.vertical === "lr" ? "vertical-lr" : "vertical-rl". stylesunicodeBidi = "plaintext"; } this.applyStyles(styles); this.div.appendChild(this.cueDiv); // Calculate the distance from the reference edge of the viewport to the text // position of the cue box. The reference edge will be resolved later when // the box orientation styles are applied. var textPos = 0; switch (cue.computedPositionAlign) { // TODO : modify these fomula to follow the spec, see bug 1277437. case "line-left": textPos = cue.position; break; case "center": textPos = cue.position - (cue.size / 2); break; case "line-right": textPos = cue.position - cue.size; break; } // Horizontal box orientation; textPos is the distance from the left edge of the // area to the left edge of the box and cue.size is the distance extending to // the right from there. if (cue.vertical === "") { this.applyStyles({ left: this.formatStyle(textPos, "%"), width: this.formatStyle(cue.size, "%") }); // Vertical box orientation; textPos is the distance from the top edge of the // area to the top edge of the box and cue.size is the height extending // downwards from there. } else { this.applyStyles({ top: this.formatStyle(textPos, "%"), height: this.formatStyle(cue.size, "%") }); } this.move = function(box) { this.applyStyles({ top: this.formatStyle(box.top, "px"), bottom: this.formatStyle(box.bottom, "px"), left: this.formatStyle(box.left, "px"), right: this.formatStyle(box.right, "px"), height: this.formatStyle(box.height, "px"), width: this.formatStyle(box.width, "px") }); }; } CueStyleBox.prototype = _objCreate(StyleBox.prototype); CueStyleBox.prototype.constructor = CueStyleBox; // Represents the co-ordinates of an Element in a way that we can easily // compute things with such as if it overlaps or intersects with another Element. // Can initialize it with either a StyleBox or another BoxPosition. function BoxPosition(obj) { var isIE8 = (typeof navigator !== "undefined") && (/MSIE\s8\.0/).test(navigator.userAgent); // Either a BoxPosition was passed in and we need to copy it, or a StyleBox // was passed in and we need to copy the results of 'getBoundingClientRect' // as the object returned is readonly. All co-ordinate values are in reference // to the viewport origin (top left). var lh, height, width, top; if (obj.div) { height = obj.div.offsetHeight; width = obj.div.offsetWidth; top = obj.div.offsetTop; var rects = (rects = obj.div.childNodes) && (rects = rects[0]) && rects.getClientRects && rects.getClientRects(); obj = obj.div.getBoundingClientRect(); // In certain cases the outter div will be slightly larger then the sum of // the inner div's lines. This could be due to bold text, etc, on some platforms. // In this case we should get the average line height and use that. This will // result in the desired behaviour. lh = rects ? Math.max((rects[0] && rects[0].height) || 0, obj.height / rects.length) : 0; } this.left = obj.left; this.right = obj.right; this.top = obj.top || top; this.height = obj.height || height; this.bottom = obj.bottom || (top + (obj.height || height)); this.width = obj.width || width; this.lineHeight = lh !== undefined ? lh : obj.lineHeight; if (isIE8 && !this.lineHeight) { this.lineHeight = 13; } } // Move the box along a particular axis. Optionally pass in an amount to move // the box. If no amount is passed then the default is the line height of the // box. BoxPosition.prototype.move = function(axis, toMove) { toMove = toMove !== undefined ? toMove : this.lineHeight; switch (axis) { case "+x": this.left += toMove; this.right += toMove; break; case "-x": this.left -= toMove; this.right -= toMove; break; case "+y": this.top += toMove; this.bottom += toMove; break; case "-y": this.top -= toMove; this.bottom -= toMove; break; } }; // Check if this box overlaps another box, b2. BoxPosition.prototype.overlaps = function(b2) { return this.left < b2.right && this.right > b2.left && this.top < b2.bottom && this.bottom > b2.top; }; // Check if this box overlaps any other boxes in boxes. BoxPosition.prototype.overlapsAny = function(boxes) { for (var i = 0; i < boxes.length; i++) { if (this.overlaps(boxes[i])) { return true; } } return false; }; // Check if this box is within another box. BoxPosition.prototype.within = function(container) { return this.top >= container.top && this.bottom <= container.bottom && this.left >= container.left && this.right <= container.right; }; // Check if this box is entirely within the container or it is overlapping // on the edge opposite of the axis direction passed. For example, if "+x" is // passed and the box is overlapping on the left edge of the container, then // return true. BoxPosition.prototype.overlapsOppositeAxis = function(container, axis) { switch (axis) { case "+x": return this.left < container.left; case "-x": return this.right > container.right; case "+y": return this.top < container.top; case "-y": return this.bottom > container.bottom; } }; // Find the percentage of the area that this box is overlapping with another // box. BoxPosition.prototype.intersectPercentage = function(b2) { var x = Math.max(0, Math.min(this.right, b2.right) - Math.max(this.left, b2.left)), y = Math.max(0, Math.min(this.bottom, b2.bottom) - Math.max(this.top, b2.top)), intersectArea = x * y; return intersectArea / (this.height * this.width); }; // Convert the positions from this box to CSS compatible positions using // the reference container's positions. This has to be done because this // box's positions are in reference to the viewport origin, whereas, CSS // values are in referecne to their respective edges. BoxPosition.prototype.toCSSCompatValues = function(reference) { return { top: this.top - reference.top, bottom: reference.bottom - this.bottom, left: this.left - reference.left, right: reference.right - this.right, height: this.height, width: this.width }; }; // Get an object that represents the box's position without anything extra. // Can pass a StyleBox, HTMLElement, or another BoxPositon. BoxPosition.getSimpleBoxPosition = function(obj) { var height = obj.div ? obj.div.offsetHeight : obj.tagName ? obj.offsetHeight : 0; var width = obj.div ? obj.div.offsetWidth : obj.tagName ? obj.offsetWidth : 0; var top = obj.div ? obj.div.offsetTop : obj.tagName ? obj.offsetTop : 0; obj = obj.div ? obj.div.getBoundingClientRect() : obj.tagName ? obj.getBoundingClientRect() : obj; var ret = { left: obj.left, right: obj.right, top: obj.top || top, height: obj.height || height, bottom: obj.bottom || (top + (obj.height || height)), width: obj.width || width }; return ret; }; // Move a StyleBox to its specified, or next best, position. The containerBox // is the box that contains the StyleBox, such as a div. boxPositions are // a list of other boxes that the styleBox can't overlap with. function moveBoxToLinePosition(window, styleBox, containerBox, boxPositions) { // Find the best position for a cue box, b, on the video. The axis parameter // is a list of axis, the order of which, it will move the box along. For example: // Passing ["+x", "-x"] will move the box first along the x axis in the positive // direction. If it doesn't find a good position for it there it will then move // it along the x axis in the negative direction. function findBestPosition(b, axis) { var bestPosition, specifiedPosition = new BoxPosition(b), percentage = 1; // Highest possible so the first thing we get is better. for (var i = 0; i < axis.length; i++) { while (b.overlapsOppositeAxis(containerBox, axis[i]) || (b.within(containerBox) && b.overlapsAny(boxPositions))) { b.move(axis[i]); } // We found a spot where we aren't overlapping anything. This is our // best position. if (b.within(containerBox)) { return b; } var p = b.intersectPercentage(containerBox); // If we're outside the container box less then we were on our last try // then remember this position as the best position. if (percentage > p) { bestPosition = new BoxPosition(b); percentage = p; } // Reset the box position to the specified position. b = new BoxPosition(specifiedPosition); } return bestPosition || specifiedPosition; } var boxPosition = new BoxPosition(styleBox), cue = styleBox.cue, linePos = cue.computedLine, axis = []; // If we have a line number to align the cue to. if (cue.snapToLines) { var size; switch (cue.vertical) { case "": axis = [ "+y", "-y" ]; size = "height"; break; case "rl": axis = [ "+x", "-x" ]; size = "width"; break; case "lr": axis = [ "-x", "+x" ]; size = "width"; break; } var step = boxPosition.lineHeight, position = step * Math.round(linePos), maxPosition = containerBox[size] + step, initialAxis = axis[0]; if (step == 0) { return; } // If the specified intial position is greater then the max position then // clamp the box to the amount of steps it would take for the box to // reach the max position. if (Math.abs(position) > maxPosition) { position = position < 0 ? -1 : 1; position *= Math.ceil(maxPosition / step) * step; } // If computed line position returns negative then line numbers are // relative to the bottom of the video instead of the top. Therefore, we // need to increase our initial position by the length or width of the // video, depending on the writing direction, and reverse our axis directions. if (linePos < 0) { position += cue.vertical === "" ? containerBox.height : containerBox.width; axis = axis.reverse(); } // Move the box to the specified position. This may not be its best // position. boxPosition.move(initialAxis, position); } else { // If we have a percentage line value for the cue. var calculatedPercentage = (boxPosition.lineHeight / containerBox.height) * 100; switch (cue.lineAlign) { case "center": linePos -= (calculatedPercentage / 2); break; case "end": linePos -= calculatedPercentage; break; } // Apply initial line position to the cue box. switch (cue.vertical) { case "": styleBox.applyStyles({ top: styleBox.formatStyle(linePos, "%") }); break; case "rl": styleBox.applyStyles({ left: styleBox.formatStyle(linePos, "%") }); break; case "lr": styleBox.applyStyles({ right: styleBox.formatStyle(linePos, "%") }); break; } axis = [ "+y", "-x", "+x", "-y" ]; // Get the box position again after we've applied the specified positioning // to it. boxPosition = new BoxPosition(styleBox); } var bestPosition = findBestPosition(boxPosition, axis); styleBox.move(bestPosition.toCSSCompatValues(containerBox)); } function WebVTT() { // Nothing } // Helper to allow strings to be decoded instead of the default binary utf8 data. WebVTT.StringDecoder = function() { return { decode: function(data) { if (!data) { return ""; } if (typeof data !== "string") { throw new Error("Error - expected string data."); } return decodeURIComponent(encodeURIComponent(data)); } }; }; WebVTT.convertCueToDOMTree = function(window, cuetext) { if (!window || !cuetext) { return null; } return parseContent(window, cuetext); }; var FONT_SIZE_PERCENT = 0.05; var FONT_STYLE = "sans-serif"; var CUE_BACKGROUND_PADDING = "1.5%"; // Runs the processing model over the cues and regions passed to it. // @param overlay A block level element (usually a div) that the computed cues // and regions will be placed into. // @param controls A Control bar element. Cues' position will be // affected and repositioned according to it. WebVTT.processCues = function(window, cues, overlay, controls) { if (!window || !cues || !overlay) { return null; } // Remove all previous children. while (overlay.firstChild) { overlay.removeChild(overlay.firstChild); } var controlBar; var controlBarShown; if (controls) { controlBar = controls.ownerDocument.getAnonymousElementByAttribute( controls, "class", "controlBar"); controlBarShown = controlBar ? !!controlBar.clientHeight : false; } var paddedOverlay = window.document.createElement("div"); paddedOverlay.style.position = "absolute"; paddedOverlay.style.left = "0"; paddedOverlay.style.right = "0"; paddedOverlay.style.top = "0"; paddedOverlay.style.bottom = "0"; paddedOverlay.style.margin = CUE_BACKGROUND_PADDING; overlay.appendChild(paddedOverlay); // Determine if we need to compute the display states of the cues. This could // be the case if a cue's state has been changed since the last computation or // if it has not been computed yet. function shouldCompute(cues) { if (controlBarShown) { return true; } for (var i = 0; i < cues.length; i++) { if (cues[i].hasBeenReset || !cues[i].displayState) { return true; } } return false; } // We don't need to recompute the cues' display states. Just reuse them. if (!shouldCompute(cues)) { for (var i = 0; i < cues.length; i++) { paddedOverlay.appendChild(cues[i].displayState); } return; } var boxPositions = [], containerBox = BoxPosition.getSimpleBoxPosition(paddedOverlay), fontSize = Math.round(containerBox.height * FONT_SIZE_PERCENT * 100) / 100; var styleOptions = { font: fontSize + "px " + FONT_STYLE }; (function() { var styleBox, cue; if (controlBarShown) { // Add an empty output box that cover the same region as video control bar. boxPositions.push(BoxPosition.getSimpleBoxPosition(controlBar)); } for (var i = 0; i < cues.length; i++) { cue = cues[i]; // Compute the intial position and styles of the cue div. styleBox = new CueStyleBox(window, cue, styleOptions); paddedOverlay.appendChild(styleBox.div); // Move the cue div to it's correct line position. moveBoxToLinePosition(window, styleBox, containerBox, boxPositions); // Remember the computed div so that we don't have to recompute it later // if we don't have too. cue.displayState = styleBox.div; boxPositions.push(BoxPosition.getSimpleBoxPosition(styleBox)); } })(); }; WebVTT.Parser = function(window, decoder) { this.window = window; this.state = "INITIAL"; this.buffer = ""; this.decoder = decoder || new TextDecoder("utf8"); this.regionList = []; }; WebVTT.Parser.prototype = { // If the error is a ParsingError then report it to the consumer if // possible. If it's not a ParsingError then throw it like normal. reportOrThrowError: function(e) { if (e instanceof ParsingError) { this.onparsingerror && this.onparsingerror(e); } else { throw e; } }, parse: function (data) { var self = this; // If there is no data then we won't decode it, but will just try to parse // whatever is in buffer already. This may occur in circumstances, for // example when flush() is called. if (data) { // Try to decode the data that we received. self.buffer += self.decoder.decode(data, {stream: true}); } function collectNextLine() { var buffer = self.buffer; var pos = 0; while (pos < buffer.length && buffer[pos] !== '\r' && buffer[pos] !== '\n') { ++pos; } var line = buffer.substr(0, pos); // Advance the buffer early in case we fail below. if (buffer[pos] === '\r') { ++pos; } if (buffer[pos] === '\n') { ++pos; } self.buffer = buffer.substr(pos); // Spec defined replacement. return line.replace(/[\u0000]/g, "\uFFFD"); } function createCueIfNeeded() { if (!self.cue) { self.cue = new self.window.VTTCue(0, 0, ""); } } // Parsing cue identifier and the identifier should be unique. // Return true if the input is a cue identifier. function parseCueIdentifier(input) { if (maybeIsTimeStampFormat(line)) { self.state = "CUE"; return false; } createCueIfNeeded(); // TODO : ensure the cue identifier is unique among all cue identifiers. self.cue.id = containsTimeDirectionSymbol(input) ? "" : input; self.state = "CUE"; return true; } // Parsing the timestamp and cue settings. // See spec, https://w3c.github.io/webvtt/#collect-webvtt-cue-timings-and-settings function parseCueMayThrow(input) { try { createCueIfNeeded(); parseCue(input, self.cue, self.regionList); self.state = "CUETEXT"; } catch (e) { self.reportOrThrowError(e); // In case of an error ignore rest of the cue. self.cue = null; self.state = "BADCUE"; } } // 3.4 WebVTT region and WebVTT region settings syntax function parseRegion(input) { var settings = new Settings(); parseOptions(input, function (k, v) { switch (k) { case "id": settings.set(k, v); break; case "width": settings.percent(k, v); break; case "lines": settings.digitsValue(k, v); break; case "regionanchor": case "viewportanchor": var xy = v.split(','); if (xy.length !== 2) { break; } // We have to make sure both x and y parse, so use a temporary // settings object here. var anchor = new Settings(); anchor.percent("x", xy[0]); anchor.percent("y", xy[1]); if (!anchor.has("x") || !anchor.has("y")) { break; } settings.set(k + "X", anchor.get("x")); settings.set(k + "Y", anchor.get("y")); break; case "scroll": settings.alt(k, v, ["up"]); break; } }, /=/, /\s/); // Create the region, using default values for any values that were not // specified. if (settings.has("id")) { var region = new self.window.VTTRegion(); region.width = settings.get("width", 100); region.lines = settings.get("lines", 3); region.regionAnchorX = settings.get("regionanchorX", 0); region.regionAnchorY = settings.get("regionanchorY", 100); region.viewportAnchorX = settings.get("viewportanchorX", 0); region.viewportAnchorY = settings.get("viewportanchorY", 100); region.scroll = settings.get("scroll", ""); // Register the region. self.onregion && self.onregion(region); // Remember the VTTRegion for later in case we parse any VTTCues that // reference it. self.regionList.push({ id: settings.get("id"), region: region }); } } // Parsing the WebVTT signature, it contains parsing algo step1 to step9. // See spec, https://w3c.github.io/webvtt/#file-parsing function parseSignatureMayThrow(input) { let signature = collectNextLine(); if (!/^WEBVTT([ \t].*)?$/.test(signature)) { throw new ParsingError(ParsingError.Errors.BadSignature); } else { self.state = "HEADER"; } } // Parsing the region and style information. // See spec, https://w3c.github.io/webvtt/#collect-a-webvtt-block // // There are sereval things would appear in header, // 1. Region or Style setting // 2. Garbage (meaningless string) // 3. Empty line // 4. Cue's timestamp // The case 4 happens when there is no line interval between the header // and the cue blocks. In this case, we should preserve the line and // return it for the next phase parsing. function parseHeader() { let line = null; while (self.buffer && self.state === "HEADER") { line = collectNextLine(); if (/^REGION|^STYLE/i.test(line)) { parseOptions(line, function (k, v) { switch (k.toUpperCase()) { case "REGION": parseRegion(v); break; case "STYLE": // TODO : not supported yet. break; } }, ":"); } else if (maybeIsTimeStampFormat(line)) { self.state = "CUE"; break; } else if (!line || onlyContainsWhiteSpaces(line) || containsTimeDirectionSymbol(line)) { // empty line, whitespaces or string contains "-->" break; } } // End parsing header part and doesn't see the timestamp. if (self.state === "HEADER") { self.state = "ID"; line = null } return line; } // 5.1 WebVTT file parsing. try { if (self.state === "INITIAL") { parseSignatureMayThrow(); } var line; if (self.state === "HEADER") { line = parseHeader(); } while (self.buffer) { if (!line) { // Since the data receiving is async, we need to wait until the // buffer gets the full line. if (!/\r\n|\n|\r/.test(self.buffer)) { return this; } line = collectNextLine(); } switch (self.state) { case "ID": // Ignore NOTE and line terminator if (/^NOTE($|[ \t])/.test(line) || !line) { break; } // If there is no cue identifier, keep the line and reuse this line // in next iteration. if (!parseCueIdentifier(line)) { continue; } break; case "CUE": parseCueMayThrow(line); break; case "CUETEXT": // Report the cue when (1) get an empty line (2) get the "-->"" if (!line || containsTimeDirectionSymbol(line)) { // We are done parsing self cue. self.oncue && self.oncue(self.cue); self.cue = null; self.state = "ID"; // Keep the line and reuse this line in next iteration. continue; } if (self.cue.text) { self.cue.text += "\n"; } self.cue.text += line; break; case "BADCUE": // BADCUE // 54-62 - Collect and discard the remaining cue. if (!line) { self.state = "ID"; } break; } // The line was already parsed, empty it to ensure we can get the // new line in next iteration. line = null; } } catch (e) { self.reportOrThrowError(e); // If we are currently parsing a cue, report what we have. if (self.state === "CUETEXT" && self.cue && self.oncue) { self.oncue(self.cue); } self.cue = null; // Enter BADWEBVTT state if header was not parsed correctly otherwise // another exception occurred so enter BADCUE state. self.state = self.state === "INITIAL" ? "BADWEBVTT" : "BADCUE"; } return this; }, flush: function () { var self = this; try { // Finish decoding the stream. self.buffer += self.decoder.decode(); // Synthesize the end of the current cue or region. if (self.cue || self.state === "HEADER") { self.buffer += "\n\n"; self.parse(); } // If we've flushed, parsed, and we're still on the INITIAL state then // that means we don't have enough of the stream to parse the first // line. if (self.state === "INITIAL") { throw new ParsingError(ParsingError.Errors.BadSignature); } } catch(e) { self.reportOrThrowError(e); } self.onflush && self.onflush(); return this; } }; global.WebVTT = WebVTT; }(this));