From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001 From: "Matt A. Tobin" Date: Fri, 2 Feb 2018 04:16:08 -0500 Subject: Add m-esr52 at 52.6.0 --- dom/media/webvtt/vtt.jsm | 1528 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1528 insertions(+) create mode 100644 dom/media/webvtt/vtt.jsm (limited to 'dom/media/webvtt/vtt.jsm') diff --git a/dom/media/webvtt/vtt.jsm b/dom/media/webvtt/vtt.jsm new file mode 100644 index 000000000..c8370e27c --- /dev/null +++ b/dom/media/webvtt/vtt.jsm @@ -0,0 +1,1528 @@ +/* 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, 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0x1EE19, + 0x1EE1A, 0x1EE1B, 0x1EE1C, 0x1EE1D, 0x1EE1E, 0x1EE1F, 0x1EE21, 0x1EE22, + 0x1EE24, 0x1EE27, 0x1EE29, 0x1EE2A, 0x1EE2B, 0x1EE2C, 0x1EE2D, 0x1EE2E, + 0x1EE2F, 0x1EE30, 0x1EE31, 0x1EE32, 0x1EE34, 0x1EE35, 0x1EE36, 0x1EE37, + 0x1EE39, 0x1EE3B, 0x1EE42, 0x1EE47, 0x1EE49, 0x1EE4B, 0x1EE4D, 0x1EE4E, + 0x1EE4F, 0x1EE51, 0x1EE52, 0x1EE54, 0x1EE57, 0x1EE59, 0x1EE5B, 0x1EE5D, + 0x1EE5F, 0x1EE61, 0x1EE62, 0x1EE64, 0x1EE67, 0x1EE68, 0x1EE69, 0x1EE6A, + 0x1EE6C, 0x1EE6D, 0x1EE6E, 0x1EE6F, 0x1EE70, 0x1EE71, 0x1EE72, 0x1EE74, + 0x1EE75, 0x1EE76, 0x1EE77, 0x1EE79, 0x1EE7A, 0x1EE7B, 0x1EE7C, 0x1EE7E, + 0x1EE80, 0x1EE81, 0x1EE82, 0x1EE83, 0x1EE84, 0x1EE85, 0x1EE86, 0x1EE87, + 0x1EE88, 0x1EE89, 0x1EE8B, 0x1EE8C, 0x1EE8D, 0x1EE8E, 0x1EE8F, 0x1EE90, + 0x1EE91, 0x1EE92, 0x1EE93, 0x1EE94, 0x1EE95, 0x1EE96, 0x1EE97, 0x1EE98, + 0x1EE99, 0x1EE9A, 0x1EE9B, 0x1EEA1, 0x1EEA2, 0x1EEA3, 0x1EEA5, 0x1EEA6, + 0x1EEA7, 0x1EEA8, 0x1EEA9, 0x1EEAB, 0x1EEAC, 0x1EEAD, 0x1EEAE, 0x1EEAF, + 0x1EEB0, 0x1EEB1, 0x1EEB2, 0x1EEB3, 0x1EEB4, 0x1EEB5, 0x1EEB6, 0x1EEB7, + 0x1EEB8, 0x1EEB9, 0x1EEBA, 0x1EEBB, 0x10FFFD]; + + function determineBidi(cueDiv) { + var nodeStack = [], + text = "", + charCode; + + if (!cueDiv || !cueDiv.childNodes) { + return "ltr"; + } + + function pushNodes(nodeStack, node) { + for (var i = node.childNodes.length - 1; i >= 0; i--) { + nodeStack.push(node.childNodes[i]); + } + } + + function nextTextNode(nodeStack) { + if (!nodeStack || !nodeStack.length) { + return null; + } + + var node = nodeStack.pop(), + text = 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)); -- cgit v1.2.3