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feat: check reading order of Media Overlays text elements
Report new error MED-015 when the order of text elements in a Media Overlay does not match the DOM order of the referenced elements in the corresponding content document(s). Applies PR #1180
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13 files changed

+123
-12
lines changed

13 files changed

+123
-12
lines changed

‎src/main/java/com/adobe/epubcheck/messages/DefaultSeverities.java

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Original file line numberDiff line numberDiff line change
@@ -151,6 +151,7 @@ private void initialize()
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severities.put(MessageId.MED_012, Severity.ERROR);
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severities.put(MessageId.MED_013, Severity.ERROR);
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severities.put(MessageId.MED_014, Severity.ERROR);
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severities.put(MessageId.MED_015, Severity.ERROR);
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// NAV
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severities.put(MessageId.NAV_001, Severity.ERROR);

‎src/main/java/com/adobe/epubcheck/messages/MessageId.java

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@@ -145,6 +145,7 @@ public enum MessageId implements Comparable<MessageId>
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MED_012("MED_012"),
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MED_013("MED_013"),
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MED_014("MED_014"),
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MED_015("MED_015"),
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// Epub3 based table of content errors
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NAV_001("NAV-001"),

‎src/main/java/com/adobe/epubcheck/opf/XRefChecker.java

Lines changed: 30 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -69,6 +69,7 @@ public static enum Type
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SEARCH_KEY,
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NAV_TOC_LINK,
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NAV_PAGELIST_LINK,
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OVERLAY_TEXT_LINK,
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PICTURE_SOURCE,
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PICTURE_SOURCE_FOREIGN;
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}
@@ -286,6 +287,7 @@ public void checkReferences()
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// if (checkReference(reference)) checkReferenceSubtypes(reference);
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Queue<Reference> tocLinks = new LinkedList<>();
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Queue<Reference> pageListLinks = new LinkedList<>();
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Queue<Reference> overlayLinks = new LinkedList<>();
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for (Reference reference : references)
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{
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switch (reference.type)
@@ -299,13 +301,17 @@ public void checkReferences()
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case NAV_PAGELIST_LINK:
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pageListLinks.add(reference);
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break;
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case OVERLAY_TEXT_LINK:
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overlayLinks.add(reference);
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break;
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default:
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checkReference(reference);
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break;
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}
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}
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checkReadingOrder(tocLinks, -1, -1);
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checkReadingOrder(pageListLinks, -1, -1);
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checkReadingOrder(overlayLinks, -1, -1);
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}
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private void checkReference(Reference ref)
@@ -533,7 +539,7 @@ private void checkReadingOrder(Queue<Reference> references, int lastSpinePositio
533539
if (ref == null) return;
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535541
Preconditions
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.checkArgument(ref.type == Type.NAV_PAGELIST_LINK || ref.type == Type.NAV_TOC_LINK);
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.checkArgument(ref.type == Type.NAV_PAGELIST_LINK || ref.type == Type.NAV_TOC_LINK || ref.type == Type.OVERLAY_TEXT_LINK);
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Resource res = resources.get(ref.refResource);
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539545
// abort early if the link target is not a spine item (checked elsewhere)
@@ -545,11 +551,18 @@ private void checkReadingOrder(Queue<Reference> references, int lastSpinePositio
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{
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String orderContext = LocalizedMessages.getInstance(locale).getSuggestion(MessageId.NAV_011,
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"spine");
548-
report.message(MessageId.NAV_011,
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EPUBLocation.create(ref.source, ref.lineNumber, ref.columnNumber),
550-
(ref.type == Type.NAV_TOC_LINK) ? "toc" : "page-list", ref.value, orderContext);
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report.message(MessageId.INF_001,
552-
EPUBLocation.create(ref.source, ref.lineNumber, ref.columnNumber), "https://github.com/w3c/publ-epub-revision/issues/1283");
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555+
if (ref.type == Type.OVERLAY_TEXT_LINK) {
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report.message(MessageId.MED_015,
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EPUBLocation.create(ref.source, ref.lineNumber, ref.columnNumber), ref.value, orderContext);
558+
}
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else {
560+
report.message(MessageId.NAV_011,
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EPUBLocation.create(ref.source, ref.lineNumber, ref.columnNumber),
562+
(ref.type == Type.NAV_TOC_LINK) ? "toc" : "page-list", ref.value, orderContext);
563+
report.message(MessageId.INF_001,
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EPUBLocation.create(ref.source, ref.lineNumber, ref.columnNumber), "https://github.com/w3c/publ-epub-revision/issues/1283");
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}
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lastSpinePosition = targetSpinePosition;
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lastAnchorPosition = -1;
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}
@@ -569,11 +582,17 @@ private void checkReadingOrder(Queue<Reference> references, int lastSpinePositio
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{
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String orderContext = LocalizedMessages.getInstance(locale).getSuggestion(MessageId.NAV_011,
571584
"document");
572-
report.message(MessageId.NAV_011,
573-
EPUBLocation.create(ref.source, ref.lineNumber, ref.columnNumber),
574-
(ref.type == Type.NAV_TOC_LINK) ? "toc" : "page-list", ref.value, orderContext);
575-
report.message(MessageId.INF_001,
576-
EPUBLocation.create(ref.source, ref.lineNumber, ref.columnNumber), "https://github.com/w3c/publ-epub-revision/issues/1283");
585+
if (ref.type == Type.OVERLAY_TEXT_LINK) {
586+
report.message(MessageId.MED_015,
587+
EPUBLocation.create(ref.source, ref.lineNumber, ref.columnNumber), ref.value, orderContext);
588+
}
589+
else {
590+
report.message(MessageId.NAV_011,
591+
EPUBLocation.create(ref.source, ref.lineNumber, ref.columnNumber),
592+
(ref.type == Type.NAV_TOC_LINK) ? "toc" : "page-list", ref.value, orderContext);
593+
report.message(MessageId.INF_001,
594+
EPUBLocation.create(ref.source, ref.lineNumber, ref.columnNumber), "https://github.com/w3c/publ-epub-revision/issues/1283");
595+
}
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}
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lastAnchorPosition = targetAnchorPosition;
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}

‎src/main/java/com/adobe/epubcheck/overlay/OverlayHandler.java

Lines changed: 12 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -150,7 +150,17 @@ private void checkType(String type)
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private void processTextSrc(XMLElement e)
152152
{
153-
processRef(e.getAttribute("src"), XRefChecker.Type.HYPERLINK);
153+
String src = e.getAttribute("src");
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155+
processRef(src, XRefChecker.Type.HYPERLINK);
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157+
String resolvedSrc = PathUtil.resolveRelativeReference(path, src);
158+
159+
if (context.xrefChecker.isPresent())
160+
{
161+
context.xrefChecker.get().registerReference(path, parser.getLineNumber(),
162+
parser.getColumnNumber(), resolvedSrc, XRefChecker.Type.OVERLAY_TEXT_LINK);
163+
}
154164
}
155165

156166
private void processAudioSrc(XMLElement e) {
@@ -163,6 +173,7 @@ private void processAudioSrc(XMLElement e) {
163173
{
164174
requiredProperties.add(ITEM_PROPERTIES.REMOTE_RESOURCES);
165175
}
176+
166177
}
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168179
private void processRef(String ref, XRefChecker.Type type)

‎src/main/resources/com/adobe/epubcheck/messages/MessageBundle.properties

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@@ -138,6 +138,7 @@ MED_011=EPUB Content Document referenced from multiple Media Overlay Documents.
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MED_012=The "media-overlay" attribute does not match the ID of the Media Overlay that refers to this document.
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MED_013=Media Overlay Document referenced from the "media-overlay" attribute does not contain a reference to this Content Document.
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MED_014=A non-empty fragment identifier is required.
141+
MED_015=Media overlay text references must be in reading order. Text target "%1$s" is before the previous link target in %2$s order.
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142143
#NAV EPUB v3 Table of contents
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NAV_001=The nav file is not supported for EPUB v2.

‎src/test/resources/epub3/files/epub/mediaoverlays-text-reading-order-error/EPUB/content_001.mp3

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‎src/test/resources/epub3/files/epub/mediaoverlays-text-reading-order-error/EPUB/content_001.smil

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@@ -0,0 +1,17 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<smil xmlns="http://www.w3.org/ns/SMIL" xmlns:epub="http://www.idpf.org/2007/ops" version="3.0">
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<body>
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<par id="par1">
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<text src="content_001.xhtml#c01"/>
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<audio src="content_001.mp3"/>
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</par>
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<par id="par2">
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<text src="content_001.xhtml#c03"/>
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<audio src="content_001.mp3"/>
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</par>
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<par id="par3">
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<text src="content_001.xhtml#c02"/>
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<audio src="content_001.mp3"/>
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</par>
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</body>
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</smil>

‎src/test/resources/epub3/files/epub/mediaoverlays-text-reading-order-error/EPUB/content_001.xhtml

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@@ -0,0 +1,12 @@
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<!DOCTYPE html>
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<meta charset="utf-8" />
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<title>Minimal EPUB</title>
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</head>
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<body>
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<h1 id="c01">Loomings</h1>
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<h2 id="c02">Roomings</h2>
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<h2 id="c03">Zoomings</h2>
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</body>
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</html>

‎src/test/resources/epub3/files/epub/mediaoverlays-text-reading-order-error/EPUB/nav.xhtml

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@@ -0,0 +1,14 @@
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<!DOCTYPE html>
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<html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops" xml:lang="en" lang="en">
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<head>
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<meta charset="utf-8"/>
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<title>Minimal Nav</title>
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</head>
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<body>
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<nav epub:type="toc">
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<ol>
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<li><a href="content_001.xhtml">content 001</a></li>
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</ol>
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</nav>
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</body>
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</html>

‎src/test/resources/epub3/files/epub/mediaoverlays-text-reading-order-error/EPUB/package.opf

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@@ -0,0 +1,20 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<package xmlns="http://www.idpf.org/2007/opf" version="3.0" xml:lang="en" unique-identifier="q">
3+
<metadata xmlns:dc="http://purl.org/dc/elements/1.1/">
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<dc:title id="title">Minimal EPUB 3.0</dc:title>
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<dc:language>en</dc:language>
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<dc:identifier id="q">NOID</dc:identifier>
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<meta property="dcterms:modified">2017-06-14T00:00:01Z</meta>
8+
<meta property="media:duration">2.5s</meta>
9+
<meta property="media:duration" refines="#mo_001">2.5s</meta>
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</metadata>
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<manifest>
12+
<item id="content_001" href="content_001.xhtml" media-type="application/xhtml+xml" media-overlay="mo_001"/>
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<item id="mo_001" href="content_001.smil" media-type="application/smil+xml"/>
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<item id="audio_001" href="content_001.mp3" media-type="audio/mpeg"/>
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<item id="nav" href="nav.xhtml" media-type="application/xhtml+xml" properties="nav"/>
16+
</manifest>
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<spine>
18+
<itemref idref="content_001" />
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</spine>
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</package>

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