imsc
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Renders IMSC documents to HTML5 fragments
1,623 lines (998 loc) • 58.2 kB
JavaScript
/*
* Copyright (c) 2016, Pierre-Anthony Lemieux <pal@sandflow.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/**
* @module imscHTML
*/
;
(function (imscHTML, imscNames, imscStyles) {
/**
* Function that maps <pre>smpte:background</pre> URIs to URLs resolving to image resource
* @callback IMGResolver
* @param {string} <pre>smpte:background</pre> URI
* @return {string} PNG resource URL
*/
/**
* Renders an ISD object (returned by <pre>generateISD()</pre>) into a
* parent element, that must be attached to the DOM. The ISD will be rendered
* into a child <pre>div</pre>
* with heigh and width equal to the clientHeight and clientWidth of the element,
* unless explicitly specified otherwise by the caller. Images URIs specified
* by <pre>smpte:background</pre> attributes are mapped to image resource URLs
* by an <pre>imgResolver</pre> function. The latter takes the value of <code>smpte:background</code>
* attribute and an <code>img</code> DOM element as input, and is expected to
* set the <code>src</code> attribute of the <code>img</code> to the absolute URI of the image.
* <pre>displayForcedOnlyMode</pre> sets the (boolean)
* value of the IMSC1 displayForcedOnlyMode parameter. The function returns
* an opaque object that should passed in <code>previousISDState</code> when this function
* is called for the next ISD, otherwise <code>previousISDState</code> should be set to
* <code>null</code>.
*
* @param {Object} isd ISD to be rendered
* @param {Object} element Element into which the ISD is rendered
* @param {?IMGResolver} imgResolver Resolve <pre>smpte:background</pre> URIs into URLs.
* @param {?number} eheight Height (in pixel) of the child <div>div</div> or null
* to use clientHeight of the parent element
* @param {?number} ewidth Width (in pixel) of the child <div>div</div> or null
* to use clientWidth of the parent element
* @param {?boolean} displayForcedOnlyMode Value of the IMSC1 displayForcedOnlyMode parameter,
* or false if null
* @param {?module:imscUtils.ErrorHandler} errorHandler Error callback
* @param {Object} previousISDState State saved during processing of the previous ISD, or null if initial call
* @param {?boolean} enableRollUp Enables roll-up animations (see CEA 708)
* @return {Object} ISD state to be provided when this funtion is called for the next ISD
*/
imscHTML.render = function (isd,
element,
imgResolver,
eheight,
ewidth,
displayForcedOnlyMode,
errorHandler,
previousISDState,
enableRollUp
) {
/* maintain aspect ratio if specified */
var height = eheight || element.clientHeight;
var width = ewidth || element.clientWidth;
if (isd.aspectRatio !== null) {
var twidth = height * isd.aspectRatio;
if (twidth > width) {
height = Math.round(width / isd.aspectRatio);
} else {
width = twidth;
}
}
var rootcontainer = document.createElement("div");
rootcontainer.style.position = "relative";
rootcontainer.style.width = width + "px";
rootcontainer.style.height = height + "px";
rootcontainer.style.margin = "auto";
rootcontainer.style.top = 0;
rootcontainer.style.bottom = 0;
rootcontainer.style.left = 0;
rootcontainer.style.right = 0;
rootcontainer.style.zIndex = 0;
var context = {
h: height,
w: width,
regionH: null,
regionW: null,
imgResolver: imgResolver,
displayForcedOnlyMode: displayForcedOnlyMode || false,
isd: isd,
errorHandler: errorHandler,
previousISDState: previousISDState,
enableRollUp: enableRollUp || false,
currentISDState: {},
flg: null, /* current fillLineGap value if active, null otherwise */
lp: null, /* current linePadding value if active, null otherwise */
mra: null, /* current multiRowAlign value if active, null otherwise */
ipd: null, /* inline progression direction (lr, rl, tb) */
bpd: null, /* block progression direction (lr, rl, tb) */
ruby: null, /* is ruby present in a <p> */
textEmphasis: null, /* is textEmphasis present in a <p> */
rubyReserve: null /* is rubyReserve applicable to a <p> */
};
element.appendChild(rootcontainer);
if ("contents" in isd) {
for (var i = 0; i < isd.contents.length; i++) {
processElement(context, rootcontainer, isd.contents[i], isd);
}
}
return context.currentISDState;
};
function processElement(context, dom_parent, isd_element, isd_parent) {
var e;
if (isd_element.kind === 'region') {
e = document.createElement("div");
e.style.position = "absolute";
} else if (isd_element.kind === 'body') {
e = document.createElement("div");
} else if (isd_element.kind === 'div') {
e = document.createElement("div");
} else if (isd_element.kind === 'image') {
e = document.createElement("img");
if (context.imgResolver !== null && isd_element.src !== null) {
var uri = context.imgResolver(isd_element.src, e);
if (uri)
e.src = uri;
e.height = context.regionH;
e.width = context.regionW;
}
} else if (isd_element.kind === 'p') {
e = document.createElement("p");
} else if (isd_element.kind === 'span') {
if (isd_element.styleAttrs[imscStyles.byName.ruby.qname] === "container") {
e = document.createElement("ruby");
context.ruby = true;
} else if (isd_element.styleAttrs[imscStyles.byName.ruby.qname] === "base") {
e = document.createElement("rb");
} else if (isd_element.styleAttrs[imscStyles.byName.ruby.qname] === "text") {
e = document.createElement("rt");
} else if (isd_element.styleAttrs[imscStyles.byName.ruby.qname] === "baseContainer") {
e = document.createElement("rbc");
} else if (isd_element.styleAttrs[imscStyles.byName.ruby.qname] === "textContainer") {
e = document.createElement("rtc");
} else if (isd_element.styleAttrs[imscStyles.byName.ruby.qname] === "delimiter") {
/* ignore rp */
return;
} else {
e = document.createElement("span");
}
//e.textContent = isd_element.text;
} else if (isd_element.kind === 'br') {
e = document.createElement("br");
}
if (!e) {
reportError(context.errorHandler, "Error processing ISD element kind: " + isd_element.kind);
return;
}
/* set language */
if (isd_element.lang) {
if (isd_element.kind === 'region' || isd_element.lang !== isd_parent.lang) {
e.lang = isd_element.lang;
}
}
/* add to parent */
dom_parent.appendChild(e);
/* override UA default margin */
/* TODO: should apply to <p> only */
e.style.margin = "0";
/* determine ipd and bpd */
if (isd_element.kind === "region") {
var wdir = isd_element.styleAttrs[imscStyles.byName.writingMode.qname];
if (wdir === "lrtb" || wdir === "lr") {
context.ipd = "lr";
context.bpd = "tb";
} else if (wdir === "rltb" || wdir === "rl") {
context.ipd = "rl";
context.bpd = "tb";
} else if (wdir === "tblr") {
context.ipd = "tb";
context.bpd = "lr";
} else if (wdir === "tbrl" || wdir === "tb") {
context.ipd = "tb";
context.bpd = "rl";
}
} else if (isd_element.kind === "p" && context.bpd === "tb") {
var pdir = isd_element.styleAttrs[imscStyles.byName.direction.qname];
context.ipd = pdir === "ltr" ? "lr" : "rl";
}
/* tranform TTML styles to CSS styles */
for (var i = 0; i < STYLING_MAP_DEFS.length; i++) {
var sm = STYLING_MAP_DEFS[i];
var attr = isd_element.styleAttrs[sm.qname];
if (attr !== undefined && sm.map !== null) {
sm.map(context, e, isd_element, attr);
}
}
var proc_e = e;
/* do we have linePadding ? */
var lp = isd_element.styleAttrs[imscStyles.byName.linePadding.qname];
if (lp && (! lp.isZero())) {
var plength = lp.toUsedLength(context.w, context.h);
if (plength > 0) {
/* apply padding to the <p> so that line padding does not cause line wraps */
var padmeasure = Math.ceil(plength) + "px";
if (context.bpd === "tb") {
proc_e.style.paddingLeft = padmeasure;
proc_e.style.paddingRight = padmeasure;
} else {
proc_e.style.paddingTop = padmeasure;
proc_e.style.paddingBottom = padmeasure;
}
context.lp = lp;
}
}
// do we have multiRowAlign?
var mra = isd_element.styleAttrs[imscStyles.byName.multiRowAlign.qname];
if (mra && mra !== "auto") {
/* create inline block to handle multirowAlign */
var s = document.createElement("span");
s.style.display = "inline-block";
s.style.textAlign = mra;
e.appendChild(s);
proc_e = s;
context.mra = mra;
}
/* do we have rubyReserve? */
var rr = isd_element.styleAttrs[imscStyles.byName.rubyReserve.qname];
if (rr && rr[0] !== "none") {
context.rubyReserve = rr;
}
/* remember we are filling line gaps */
if (isd_element.styleAttrs[imscStyles.byName.fillLineGap.qname]) {
context.flg = true;
}
if (isd_element.kind === "span" && isd_element.text) {
var te = isd_element.styleAttrs[imscStyles.byName.textEmphasis.qname];
if (te && te.style !== "none") {
context.textEmphasis = true;
}
if (imscStyles.byName.textCombine.qname in isd_element.styleAttrs &&
isd_element.styleAttrs[imscStyles.byName.textCombine.qname] === "all") {
/* ignore tate-chu-yoku since line break cannot happen within */
e.textContent = isd_element.text;
if (te) {
applyTextEmphasis(context, e, isd_element, te);
};
} else {
// wrap characters in spans to find the line wrap locations
var cbuf = '';
for (var j = 0; j < isd_element.text.length; j++) {
cbuf += isd_element.text.charAt(j);
var cc = isd_element.text.charCodeAt(j);
if (cc < 0xD800 || cc > 0xDBFF || j === isd_element.text.length - 1) {
/* wrap the character(s) in a span unless it is a high surrogate */
var span = document.createElement("span");
span.textContent = cbuf;
/* apply textEmphasis */
if (te) {
applyTextEmphasis(context, span, isd_element, te);
};
e.appendChild(span);
cbuf = '';
//For the sake of merging these back together, record what isd element generated it.
span._isd_element = isd_element;
}
}
}
}
/* process the children of the ISD element */
if ("contents" in isd_element) {
for (var k = 0; k < isd_element.contents.length; k++) {
processElement(context, proc_e, isd_element.contents[k], isd_element);
}
}
/* list of lines */
var linelist = [];
/* paragraph processing */
/* TODO: linePadding only supported for horizontal scripts */
if (isd_element.kind === "p") {
constructLineList(context, proc_e, linelist, null);
/* apply rubyReserve */
if (context.rubyReserve) {
applyRubyReserve(linelist, context);
context.rubyReserve = null;
}
/* apply tts:rubyPosition="outside" */
if (context.ruby || context.rubyReserve) {
applyRubyPosition(linelist, context);
context.ruby = null;
}
/* apply text emphasis "outside" position */
if (context.textEmphasis) {
applyTextEmphasisOutside(linelist, context);
context.textEmphasis = null;
}
/* insert line breaks for multirowalign */
if (context.mra) {
applyMultiRowAlign(linelist);
context.mra = null;
}
/* add linepadding */
if (context.lp) {
applyLinePadding(linelist, context.lp.toUsedLength(context.w, context.h), context);
context.lp = null;
}
mergeSpans(linelist); // The earlier we can do this the less processing there will be.
/* fill line gaps linepadding */
if (context.flg) {
var par_edges = rect2edges(proc_e.getBoundingClientRect(), context);
applyFillLineGap(linelist, par_edges.before, par_edges.after, context, proc_e);
context.flg = null;
}
}
/* region processing */
if (isd_element.kind === "region") {
/* perform roll up if needed */
if ((context.bpd === "tb") &&
context.enableRollUp &&
isd_element.contents.length > 0 &&
isd_element.styleAttrs[imscStyles.byName.displayAlign.qname] === 'after') {
/* build line list */
constructLineList(context, proc_e, linelist, null);
/* horrible hack, perhaps default region id should be underscore everywhere? */
var rid = isd_element.id === '' ? '_' : isd_element.id;
var rb = new RegionPBuffer(rid, linelist);
context.currentISDState[rb.id] = rb;
if (context.previousISDState &&
rb.id in context.previousISDState &&
context.previousISDState[rb.id].plist.length > 0 &&
rb.plist.length > 1 &&
rb.plist[rb.plist.length - 2].text ===
context.previousISDState[rb.id].plist[context.previousISDState[rb.id].plist.length - 1].text) {
var body_elem = e.firstElementChild;
var h = rb.plist[rb.plist.length - 1].after - rb.plist[rb.plist.length - 1].before;
body_elem.style.bottom = "-" + h + "px";
body_elem.style.transition = "transform 0.4s";
body_elem.style.position = "relative";
body_elem.style.transform = "translateY(-" + h + "px)";
}
}
}
}
function mergeSpans(lineList) {
for (var i = 0; i < lineList.length; i++) {
var line = lineList[i];
for (var j = 1; j < line.elements.length;) {
var previous = line.elements[j - 1];
var span = line.elements[j];
if (spanMerge(previous.node, span.node)) {
//removed from DOM by spanMerge(), remove from the list too.
line.elements.splice(j, 1);
continue;
} else {
j++;
}
}
}
// Copy backgroundColor to each span so that fillLineGap will apply padding to elements with the right background
var thisNode, ancestorBackgroundColor;
var clearTheseBackgrounds = [];
for (var l = 0; l < lineList.length; l++) {
for (var el = 0; el < lineList[l].elements.length; el++) {
thisNode = lineList[l].elements[el].node;
ancestorBackgroundColor = getSpanAncestorColor(thisNode, clearTheseBackgrounds, false);
if (ancestorBackgroundColor) {
thisNode.style.backgroundColor = ancestorBackgroundColor;
}
}
}
for (var bi = 0; bi < clearTheseBackgrounds.length; bi++) {
clearTheseBackgrounds[bi].style.backgroundColor = "";
}
}
function getSpanAncestorColor(element, ancestorList, isAncestor) {
if (element.style.backgroundColor) {
if (isAncestor && !ancestorList.includes(element)) {
ancestorList.push(element);
}
return element.style.backgroundColor;
} else {
if (element.parentElement.nodeName === "SPAN") {
return getSpanAncestorColor(element.parentElement, ancestorList, true);
}
}
return undefined;
}
function spanMerge(first, second) {
if (first.tagName === "SPAN" &&
second.tagName === "SPAN" &&
first._isd_element === second._isd_element) {
first.textContent += second.textContent;
for (var i = 0; i < second.style.length; i++) {
var styleName = second.style[i];
if (styleName.indexOf("border") >= 0 ||
styleName.indexOf("padding") >= 0 ||
styleName.indexOf("margin") >= 0) {
first.style[styleName] = second.style[styleName];
}
}
second.parentElement.removeChild(second);
return true;
}
return false;
}
function applyLinePadding(lineList, lp, context) {
if (lineList === null) return;
for (var i = 0; i < lineList.length; i++) {
var l = lineList[i].elements.length;
var pospadpxlen = Math.ceil(lp) + "px";
var negpadpxlen = "-" + Math.ceil(lp) + "px";
if (l !== 0) {
var se = lineList[i].elements[lineList[i].start_elem];
var ee = lineList[i].elements[lineList[i].end_elem];
if (se === ee) {
// Check to see if there's any background at all
elementBoundingRect = se.node.getBoundingClientRect();
if (elementBoundingRect.width == 0 || elementBoundingRect.height == 0) {
// There's no background on this line, move on.
continue;
}
}
// Start element
if (context.ipd === "lr") {
se.node.style.marginLeft = negpadpxlen;
se.node.style.paddingLeft = pospadpxlen;
} else if (context.ipd === "rl") {
se.node.style.paddingRight = pospadpxlen;
se.node.style.marginRight = negpadpxlen;
} else if (context.ipd === "tb") {
se.node.style.paddingTop = pospadpxlen;
se.node.style.marginTop = negpadpxlen;
}
// End element
if (context.ipd === "lr") {
ee.node.style.marginRight = negpadpxlen;
ee.node.style.paddingRight = pospadpxlen;
} else if (context.ipd === "rl") {
ee.node.style.paddingLeft = pospadpxlen;
ee.node.style.marginLeft = negpadpxlen;
} else if (context.ipd === "tb") {
ee.node.style.paddingBottom = pospadpxlen;
ee.node.style.marginBottom = negpadpxlen;
}
}
}
}
function applyMultiRowAlign(lineList) {
/* apply an explicit br to all but the last line */
for (var i = 0; i < lineList.length - 1; i++) {
var l = lineList[i].elements.length;
if (l !== 0 && lineList[i].br === false) {
var br = document.createElement("br");
var lastnode = lineList[i].elements[l - 1].node;
lastnode.parentElement.insertBefore(br, lastnode.nextSibling);
}
}
}
function applyTextEmphasisOutside(lineList, context) {
/* supports "outside" only */
for (var i = 0; i < lineList.length; i++) {
for (var j = 0; j < lineList[i].te.length; j++) {
/* skip if position already set */
if (lineList[i].te[j].style[TEXTEMPHASISPOSITION_PROP] &&
lineList[i].te[j].style[TEXTEMPHASISPOSITION_PROP] !== "none")
continue;
var pos;
if (context.bpd === "tb") {
pos = (i === 0) ? "left over" : "left under";
} else {
if (context.bpd === "rl") {
pos = (i === 0) ? "right under" : "left under";
} else {
pos = (i === 0) ? "left under" : "right under";
}
}
lineList[i].te[j].style[TEXTEMPHASISPOSITION_PROP] = pos;
}
}
}
function applyRubyPosition(lineList, context) {
for (var i = 0; i < lineList.length; i++) {
for (var j = 0; j < lineList[i].rbc.length; j++) {
/* skip if ruby-position already set */
if (lineList[i].rbc[j].style[RUBYPOSITION_PROP])
continue;
var pos;
if (RUBYPOSITION_ISWK) {
/* WebKit exception */
pos = (i === 0) ? "before" : "after";
} else if (context.bpd === "tb") {
pos = (i === 0) ? "over" : "under";
} else {
if (context.bpd === "rl") {
pos = (i === 0) ? "over" : "under";
} else {
pos = (i === 0) ? "under" : "over";
}
}
lineList[i].rbc[j].style[RUBYPOSITION_PROP] = pos;
}
}
}
function applyRubyReserve(lineList, context) {
for (var i = 0; i < lineList.length; i++) {
var ruby = document.createElement("ruby");
var rb = document.createElement("rb");
rb.textContent = "\u200B";
ruby.appendChild(rb);
var rt1;
var rt2;
var fs = context.rubyReserve[1].toUsedLength(context.w, context.h) + "px";
if (context.rubyReserve[0] === "both" || (context.rubyReserve[0] === "outside" && lineList.length == 1)) {
rt1 = document.createElement("rtc");
rt1.style[RUBYPOSITION_PROP] = RUBYPOSITION_ISWK ? "after" : "under";
rt1.textContent = "\u200B";
rt1.style.fontSize = fs;
rt2 = document.createElement("rtc");
rt2.style[RUBYPOSITION_PROP] = RUBYPOSITION_ISWK ? "before" : "over";
rt2.textContent = "\u200B";
rt2.style.fontSize = fs;
ruby.appendChild(rt1);
ruby.appendChild(rt2);
} else {
rt1 = document.createElement("rtc");
rt1.textContent = "\u200B";
rt1.style.fontSize = fs;
var pos;
if (context.rubyReserve[0] === "after" || (context.rubyReserve[0] === "outside" && i > 0)) {
pos = RUBYPOSITION_ISWK ? "after" : ((context.bpd === "tb" || context.bpd === "rl") ? "under" : "over");
} else {
pos = RUBYPOSITION_ISWK ? "before" : ((context.bpd === "tb" || context.bpd === "rl") ? "over" : "under");
}
rt1.style[RUBYPOSITION_PROP] = pos;
ruby.appendChild(rt1);
}
/* add in front of the first ruby element of the line, if it exists */
var sib = null;
for (var j = 0; j < lineList[i].rbc.length; j++) {
if (lineList[i].rbc[j].localName === 'ruby') {
sib = lineList[i].rbc[j];
/* copy specified style properties from the sibling ruby container */
for (var k = 0; k < sib.style.length; k++) {
ruby.style.setProperty(sib.style.item(k), sib.style.getPropertyValue(sib.style.item(k)));
}
break;
}
}
/* otherwise add before first span */
sib = sib || lineList[i].elements[0].node;
sib.parentElement.insertBefore(ruby, sib);
}
}
function applyFillLineGap(lineList, par_before, par_after, context, element) {
/* positive for BPD = lr and tb, negative for BPD = rl */
var s = Math.sign(par_after - par_before);
for (var i = 0; i <= lineList.length; i++) {
/* compute frontier between lines */
var frontier;
if (i === 0) {
frontier = Math.round(par_before);
} else if (i === lineList.length) {
frontier = Math.round(par_after);
} else {
frontier = Math.round((lineList[i - 1].after + lineList[i].before) / 2);
}
var padding;
var l,thisNode;
/* before line */
if (i > 0) {
if (lineList[i-1]) {
for (l = 0; l < lineList[i - 1].elements.length; l++) {
thisNode=lineList[i - 1].elements[l];
padding = s*(frontier-thisNode.after) + "px";
if (context.bpd === "lr") {
thisNode.node.style.paddingRight = padding;
} else if (context.bpd === "rl") {
thisNode.node.style.paddingLeft = padding;
} else if (context.bpd === "tb") {
thisNode.node.style.paddingBottom = padding;
}
}
}
}
/* after line */
if (i < lineList.length) {
for (l = 0; l < lineList[i].elements.length; l++) {
thisNode = lineList[i].elements[l];
padding = s * (thisNode.before - frontier) + "px";
if (context.bpd === "lr") {
thisNode.node.style.paddingLeft = padding;
} else if (context.bpd === "rl") {
thisNode.node.style.paddingRight = padding;
} else if (context.bpd === "tb") {
thisNode.node.style.paddingTop = padding;
}
}
}
}
}
function RegionPBuffer(id, lineList) {
this.id = id;
this.plist = lineList;
}
function rect2edges(rect, context) {
var edges = {before: null, after: null, start: null, end: null};
if (context.bpd === "tb") {
edges.before = rect.top;
edges.after = rect.bottom;
if (context.ipd === "lr") {
edges.start = rect.left;
edges.end = rect.right;
} else {
edges.start = rect.right;
edges.end = rect.left;
}
} else if (context.bpd === "lr") {
edges.before = rect.left;
edges.after = rect.right;
edges.start = rect.top;
edges.end = rect.bottom;
} else if (context.bpd === "rl") {
edges.before = rect.right;
edges.after = rect.left;
edges.start = rect.top;
edges.end = rect.bottom;
}
return edges;
}
function constructLineList(context, element, llist, bgcolor) {
if (element.localName === "rt" || element.localName === "rtc") {
/* skip ruby annotations */
return;
}
var curbgcolor = element.style.backgroundColor || bgcolor;
if (element.childElementCount === 0) {
if (element.localName === 'span' || element.localName === 'rb') {
var r = element.getBoundingClientRect();
var edges = rect2edges(r, context);
if (llist.length === 0 ||
(!isSameLine(edges.before, edges.after, llist[llist.length - 1].before, llist[llist.length - 1].after))
) {
llist.push({
before: edges.before,
after: edges.after,
start: edges.start,
end: edges.end,
start_elem: 0,
end_elem: 0,
elements: [],
rbc: [],
te: [],
text: "",
br: false
});
} else {
/* positive for BPD = lr and tb, negative for BPD = rl */
var bpd_dir = Math.sign(edges.after - edges.before);
/* positive for IPD = lr and tb, negative for IPD = rl */
var ipd_dir = Math.sign(edges.end - edges.start);
/* check if the line height has increased */
if (bpd_dir * (edges.before - llist[llist.length - 1].before) < 0) {
llist[llist.length - 1].before = edges.before;
}
if (bpd_dir * (edges.after - llist[llist.length - 1].after) > 0) {
llist[llist.length - 1].after = edges.after;
}
if (ipd_dir * (edges.start - llist[llist.length - 1].start) < 0) {
llist[llist.length - 1].start = edges.start;
llist[llist.length - 1].start_elem = llist[llist.length - 1].elements.length;
}
if (ipd_dir * (edges.end - llist[llist.length - 1].end) > 0) {
llist[llist.length - 1].end = edges.end;
llist[llist.length - 1].end_elem = llist[llist.length - 1].elements.length;
}
}
llist[llist.length - 1].text += element.textContent;
llist[llist.length - 1].elements.push(
{
node: element,
bgcolor: curbgcolor,
before: edges.before,
after: edges.after
}
);
} else if (element.localName === 'br' && llist.length !== 0) {
llist[llist.length - 1].br = true;
}
} else {
var child = element.firstChild;
while (child) {
if (child.nodeType === Node.ELEMENT_NODE) {
constructLineList(context, child, llist, curbgcolor);
if (child.localName === 'ruby' || child.localName === 'rtc') {
/* remember non-empty ruby and rtc elements so that tts:rubyPosition can be applied */
if (llist.length > 0) {
llist[llist.length - 1].rbc.push(child);
}
} else if (child.localName === 'span' &&
child.style[TEXTEMPHASISSTYLE_PROP] &&
child.style[TEXTEMPHASISSTYLE_PROP] !== "none") {
/* remember non-empty span elements with textEmphasis */
if (llist.length > 0) {
llist[llist.length - 1].te.push(child);
}
}
}
child = child.nextSibling;
}
}
}
function isSameLine(before1, after1, before2, after2) {
return ((after1 < after2) && (before1 > before2)) || ((after2 <= after1) && (before2 >= before1));
}
function applyTextEmphasis(context, dom_element, isd_element, attr) {
/* ignore color (not used in IMSC 1.1) */
if (attr.style === "none") {
/* text-emphasis is not inherited and the default is none, so nothing to do */
return;
} else if (attr.style === "auto") {
dom_element.style[TEXTEMPHASISSTYLE_PROP] = "filled";
} else {
dom_element.style[TEXTEMPHASISSTYLE_PROP] = attr.style + " " + attr.symbol;
}
/* ignore "outside" position (set in postprocessing) */
if (attr.position === "before" || attr.position === "after") {
var pos;
if (context.bpd === "tb") {
pos = (attr.position === "before") ? "left over" : "left under";
} else {
if (context.bpd === "rl") {
pos = (attr.position === "before") ? "right under" : "left under";
} else {
pos = (attr.position === "before") ? "left under" : "right under";
}
}
dom_element.style[TEXTEMPHASISPOSITION_PROP] = pos;
}
}
function HTMLStylingMapDefinition(qName, mapFunc) {
this.qname = qName;
this.map = mapFunc;
}
var STYLING_MAP_DEFS = [
new HTMLStylingMapDefinition(
"http://www.w3.org/ns/ttml#styling backgroundColor",
function (context, dom_element, isd_element, attr) {
/* skip if transparent */
if (attr[3] === 0)
return;
dom_element.style.backgroundColor = "rgba(" +
attr[0].toString() + "," +
attr[1].toString() + "," +
attr[2].toString() + "," +
(attr[3] / 255).toString() +
")";
}
),
new HTMLStylingMapDefinition(
"http://www.w3.org/ns/ttml#styling color",
function (context, dom_element, isd_element, attr) {
dom_element.style.color = "rgba(" +
attr[0].toString() + "," +
attr[1].toString() + "," +
attr[2].toString() + "," +
(attr[3] / 255).toString() +
")";
}
),
new HTMLStylingMapDefinition(
"http://www.w3.org/ns/ttml#styling direction",
function (context, dom_element, isd_element, attr) {
dom_element.style.direction = attr;
}
),
new HTMLStylingMapDefinition(
"http://www.w3.org/ns/ttml#styling display",
function (context, dom_element, isd_element, attr) {}
),
new HTMLStylingMapDefinition(
"http://www.w3.org/ns/ttml#styling displayAlign",
function (context, dom_element, isd_element, attr) {
/* see https://css-tricks.com/snippets/css/a-guide-to-flexbox/ */
/* TODO: is this affected by writing direction? */
dom_element.style.display = "flex";
dom_element.style.flexDirection = "column";
if (attr === "before") {
dom_element.style.justifyContent = "flex-start";
} else if (attr === "center") {
dom_element.style.justifyContent = "center";
} else if (attr === "after") {
dom_element.style.justifyContent = "flex-end";
}
}
),
new HTMLStylingMapDefinition(
"http://www.w3.org/ns/ttml#styling extent",
function (context, dom_element, isd_element, attr) {
/* TODO: this is super ugly */
context.regionH = attr.h.toUsedLength(context.w, context.h);
context.regionW = attr.w.toUsedLength(context.w, context.h);
/*
* CSS height/width are measured against the content rectangle,
* whereas TTML height/width include padding
*/
var hdelta = 0;
var wdelta = 0;
var p = isd_element.styleAttrs["http://www.w3.org/ns/ttml#styling padding"];
if (!p) {
/* error */
} else {
hdelta = p[0].toUsedLength(context.w, context.h) + p[2].toUsedLength(context.w, context.h);
wdelta = p[1].toUsedLength(context.w, context.h) + p[3].toUsedLength(context.w, context.h);
}
dom_element.style.height = (context.regionH - hdelta) + "px";
dom_element.style.width = (context.regionW - wdelta) + "px";
}
),
new HTMLStylingMapDefinition(
"http://www.w3.org/ns/ttml#styling fontFamily",
function (context, dom_element, isd_element, attr) {
var rslt = [];
/* per IMSC1 */
for (var i = 0; i < attr.length; i++) {
if (attr[i] === "monospaceSerif") {
rslt.push("Courier New");
rslt.push('"Liberation Mono"');
rslt.push("Courier");
rslt.push("monospace");
} else if (attr[i] === "proportionalSansSerif") {
rslt.push("Arial");
rslt.push("Helvetica");
rslt.push('"Liberation Sans"');
rslt.push("sans-serif");
} else if (attr[i] === "monospace") {
rslt.push("monospace");
} else if (attr[i] === "sansSerif") {
rslt.push("sans-serif");
} else if (attr[i] === "serif") {
rslt.push("serif");
} else if (attr[i] === "monospaceSansSerif") {
rslt.push("Consolas");
rslt.push("monospace");
} else if (attr[i] === "proportionalSerif") {
rslt.push("serif");
} else {
rslt.push(attr[i]);
}
}
// prune later duplicates we may have inserted
if (rslt.length > 0) {
var unique=[rslt[0]];
for (var fi = 1; fi < rslt.length; fi++) {
if (unique.indexOf(rslt[fi]) == -1) {
unique.push(rslt[fi]);
}
}
rslt = unique;
}
dom_element.style.fontFamily = rslt.join(",");
}
),
new HTMLStylingMapDefinition(
"http://www.w3.org/ns/ttml#styling shear",
function (context, dom_element, isd_element, attr) {
/* return immediately if tts:shear is 0% since CSS transforms are not inherited*/
if (attr === 0)
return;
var angle = attr * -0.9;
/* context.bpd is needed since writing mode is not inherited and sets the inline progression */
if (context.bpd === "tb") {
dom_element.style.transform = "skewX(" + angle + "deg)";
} else {
dom_element.style.transform = "skewY(" + angle + "deg)";
}
}
),
new HTMLStylingMapDefinition(
"http://www.w3.org/ns/ttml#styling fontSize",
function (context, dom_element, isd_element, attr) {
dom_element.style.fontSize = attr.toUsedLength(context.w, context.h) + "px";
}
),
new HTMLStylingMapDefinition(
"http://www.w3.org/ns/ttml#styling fontStyle",
function (context, dom_element, isd_element, attr) {
dom_element.style.fontStyle = attr;
}
),
new HTMLStylingMapDefinition(
"http://www.w3.org/ns/ttml#styling fontWeight",
function (context, dom_element, isd_element, attr) {
dom_element.style.fontWeight = attr;
}
),
new HTMLStylingMapDefinition(
"http://www.w3.org/ns/ttml#styling lineHeight",
function (context, dom_element, isd_element, attr) {
if (attr === "normal") {
dom_element.style.lineHeight = "normal";
} else {
dom_element.style.lineHeight = attr.toUsedLength(context.w, context.h) + "px";
}
}
),
new HTMLStylingMapDefinition(
"http://www.w3.org/ns/ttml#styling opacity",
function (context, dom_element, isd_element, attr) {
dom_element.style.opacity = attr;
}
),
new HTMLStylingMapDefinition(
"http://www.w3.org/ns/ttml#styling origin",
function (context, dom_element, isd_element, attr) {
dom_element.style.top = attr.h.toUsedLength(context.w, context.h) + "px";
dom_element.style.left = attr.w.toUsedLength(context.w, context.h) + "px";
}
),
new HTMLStylingMapDefinition(
"http://www.w3.org/ns/ttml#styling overflow",
function (context, dom_element, isd_element, attr) {
dom_element.style.overflow = attr;
}
),
new HTMLStylingMapDefinition(
"http://www.w3.org/ns/ttml#styling padding",
function (context, dom_element, isd_element, attr) {
/* attr: top,left,bottom,right*/
/* style: top right bottom left*/
var rslt = [];
rslt[0] = attr[0].toUsedLength(context.w, context.h) + "px";
rslt[1] = attr[3].toUsedLength(context.w, context.h) + "px";
rslt[2] = attr[2].toUsedLength(context.w, context.h) + "px";
rslt[3] = attr[1].toUsedLength(context.w, context.h) + "px";
dom_element.style.padding = rslt.join(" ");
}
),
new HTMLStylingMapDefinition(
"http://www.w3.org/ns/ttml#styling position",
function (context, dom_element, isd_element, attr) {
dom_element.style.top = attr.h.toUsedLength(context.w, context.h) + "px";
dom_element.style.left = attr.w.toUsedLength(context.w, context.h) + "px";
}
),
new HTMLStylingMapDefinition(
"http://www.w3.org/ns/ttml#styling rubyAlign",
function (context, dom_element, isd_element, attr) {
dom_element.style.rubyAlign = attr === "spaceAround" ? "space-around" : "center";
}
),
new HTMLStylingMapDefinition(
"http://www.w3.org/ns/ttml#styling rubyPosition",
function (context, dom_element, isd_element, attr) {
/* skip if "outside", which is handled by applyRubyPosition() */
if (attr === "before" || attr === "after") {
var pos;
if (RUBYPOSITION_ISWK) {
/* WebKit exception */
pos = attr;
} else if (context.bpd === "tb") {
pos = (attr === "before") ? "over" : "under";
} else {
if (context.bpd === "rl") {
pos = (attr === "before") ? "over" : "under";
} else {
pos = (attr === "before") ? "under" : "over";
}
}
/* apply position to the parent dom_element, i.e. ruby or rtc */
dom_element.parentElement.style[RUBYPOSITION_PROP] = pos;
}
}
),
new HTMLStylingMapDefinition(
"http://www.w3.org/ns/ttml#styling showBackground",
null
),
new HTMLStylingMapDefinition(
"http://www.w3.org/ns/ttml#styling textAlign",
function (context, dom_element, isd_element, attr) {
var ta;
/* handle UAs that do not understand start or end */
if (attr === "start") {
ta = (context.ipd === "rl") ? "right" : "left";