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nl.dedicon.pipeline.braille.impl.DediconTranslator Maven / Gradle / Ivy
package nl.dedicon.pipeline.braille.impl;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.net.URI;
import com.google.common.base.MoreObjects;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import java.util.Arrays;
import java.util.Locale;
import org.daisy.common.file.URIs;
import org.daisy.common.file.URLs;
import org.daisy.pipeline.braille.common.AbstractBrailleTranslator;
import org.daisy.pipeline.braille.common.AbstractTransformProvider;
import org.daisy.pipeline.braille.common.AbstractTransformProvider.util.Function;
import org.daisy.pipeline.braille.common.AbstractTransformProvider.util.Iterables;
import static org.daisy.pipeline.braille.common.AbstractTransformProvider.util.Iterables.concat;
import static org.daisy.pipeline.braille.common.AbstractTransformProvider.util.Iterables.transform;
import static org.daisy.pipeline.braille.common.AbstractTransformProvider.util.logCreate;
import static org.daisy.pipeline.braille.common.AbstractTransformProvider.util.logSelect;
import org.daisy.pipeline.braille.common.BrailleTranslator;
import org.daisy.pipeline.braille.common.BrailleTranslatorProvider;
import org.daisy.pipeline.braille.common.CSSStyledText;
import org.daisy.pipeline.braille.common.Hyphenator;
import org.daisy.pipeline.braille.common.HyphenatorProvider;
import org.daisy.pipeline.braille.common.Query;
import org.daisy.pipeline.braille.common.Query.Feature;
import org.daisy.pipeline.braille.common.Query.MutableQuery;
import static org.daisy.pipeline.braille.common.Query.util.mutableQuery;
import static org.daisy.pipeline.braille.common.Query.util.query;
import org.daisy.pipeline.braille.common.TransformProvider;
import static org.daisy.pipeline.braille.common.TransformProvider.util.dispatch;
import static org.daisy.pipeline.braille.common.TransformProvider.util.memoize;
import static org.daisy.pipeline.braille.common.util.Locales.parseLocale;
import org.daisy.pipeline.braille.liblouis.LiblouisTranslator;
import org.osgi.service.component.annotations.Activate;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;
import org.osgi.service.component.annotations.ReferenceCardinality;
import org.osgi.service.component.annotations.ReferencePolicy;
import org.osgi.service.component.ComponentContext;
public interface DediconTranslator {
@Component(
name = "nl.dedicon.pipeline.braille.impl.DediconTranslator.Provider",
service = {
TransformProvider.class,
BrailleTranslatorProvider.class
}
)
public class Provider extends AbstractTransformProvider implements BrailleTranslatorProvider {
private URI href;
@Activate
void activate(final Map properties) {
href = URIs.asURI(URLs.getResourceFromJAR("/xml/xproc/block-translate.xpl", DediconTranslator.class));
}
private final static Iterable empty = Iterables.empty();
private final static List supportedInput = ImmutableList.of("css", "text-css", "dtbook", "html");
private final static List supportedOutput = ImmutableList.of("css", "braille");
/**
* Recognized features:
*
* - translator: Will only match if the value is `dedicon'.
* - locale: Used for selecting hyphenator.
*
*/
@Override
protected final Iterable _get(Query query) {
// @todo determine liblouisTable based on query parameter locale
final Query liblouisTable = query("(locale:nl_NL)");
Query hyphenationLocale = null;
final MutableQuery q = mutableQuery(query);
for (Feature f : q.removeAll("input")) {
if (!supportedInput.contains(f.getValue().get())) {
return empty;
}
}
for (Feature f : q.removeAll("output")) {
if (!supportedOutput.contains(f.getValue().get())) {
return empty;
}
}
if (q.containsKey("locale")) {
hyphenationLocale = mutableQuery().addAll(q.removeAll("locale"));
}
if (hyphenationLocale == null) {
return empty;
}
if (q.containsKey("translator")) {
if ("dedicon".equals(q.removeOnly("translator").getValue().get())) {
if (q.isEmpty()) {
Query hyphenTable = mutableQuery(hyphenationLocale).add("hyphenator", "hyphen");
Query fallbackHyphenationTable = mutableQuery(hyphenationLocale).add("hyphenator", "tex");
Iterable hyphenators = concat(
logSelect(hyphenTable, hyphenatorProvider),
logSelect(fallbackHyphenationTable, hyphenatorProvider)
);
return concat(
transform(
concat(
transform(
hyphenators,
new Function() {
@Override
public String _apply(Hyphenator h) {
return h.getIdentifier();
}
}
),
"liblouis"
),
new Function>() {
@Override
public Iterable _apply(String hyphenator) {
final Query translatorQuery = mutableQuery(liblouisTable).add("hyphenator", hyphenator);
return transform(
logSelect(translatorQuery, liblouisTranslatorProvider),
new Function() {
@Override
public BrailleTranslator _apply(LiblouisTranslator translator) {
return __apply(logCreate(new TransformImpl(translatorQuery.toString(), translator)));
}
}
);
}
}
)
);
}
}
}
return empty;
}
private class TransformImpl extends AbstractBrailleTranslator {
private final FromStyledTextToBraille translator;
private final XProc xproc;
private TransformImpl(String translatorQuery, LiblouisTranslator translator) {
Map options = ImmutableMap.of("text-transform", mutableQuery().add("id", this.getIdentifier()).toString());
xproc = new XProc(href, null, options);
this.translator = translator.fromStyledTextToBraille();
}
@Override
public XProc asXProc() {
return xproc;
}
@Override
public FromStyledTextToBraille fromStyledTextToBraille() {
return fromStyledTextToBraille;
}
private final FromStyledTextToBraille fromStyledTextToBraille = new FromStyledTextToBraille() {
@Override
public java.lang.Iterable transform(java.lang.Iterable styledText, int from, int to) {
return translator.transform(styledText, from, to);
}
};
@Override
public String toString() {
return MoreObjects.toStringHelper(DediconTranslator.class.getSimpleName())
.add("id", getIdentifier())
.add("liblouisTranslator", translator)
.toString();
}
}
@Reference(
name = "LiblouisTranslatorProvider",
unbind = "unbindLiblouisTranslatorProvider",
service = LiblouisTranslator.Provider.class,
cardinality = ReferenceCardinality.MULTIPLE,
policy = ReferencePolicy.DYNAMIC
)
protected void bindLiblouisTranslatorProvider(LiblouisTranslator.Provider provider) {
liblouisTranslatorProviders.add(provider);
}
protected void unbindLiblouisTranslatorProvider(LiblouisTranslator.Provider provider) {
liblouisTranslatorProviders.remove(provider);
liblouisTranslatorProvider.invalidateCache();
}
private final List> liblouisTranslatorProviders
= new ArrayList<>();
private final TransformProvider.util.MemoizingProvider liblouisTranslatorProvider
= memoize(dispatch(liblouisTranslatorProviders));
@Reference(
name = "HyphenatorProvider",
unbind = "unbindHyphenatorProvider",
service = HyphenatorProvider.class,
cardinality = ReferenceCardinality.MULTIPLE,
policy = ReferencePolicy.DYNAMIC
)
@SuppressWarnings(
"unchecked" // safe cast to TransformProvider
)
protected void bindHyphenatorProvider(HyphenatorProvider provider) {
hyphenatorProviders.add((TransformProvider) provider);
}
protected void unbindHyphenatorProvider(HyphenatorProvider provider) {
hyphenatorProviders.remove((HyphenatorProvider)provider);
hyphenatorProvider.invalidateCache();
}
private final List> hyphenatorProviders
= new ArrayList<>();
private final TransformProvider.util.MemoizingProvider hyphenatorProvider
= memoize(dispatch(hyphenatorProviders));
}
}
