org.daisy.pipeline.braille.css.impl.BrailleCssCascader Maven / Gradle / Ivy
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package org.daisy.pipeline.braille.css.impl;
import java.io.File;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.Set;
import javax.xml.namespace.QName;
import javax.xml.transform.URIResolver;
import com.google.common.base.MoreObjects;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Iterables;
import cz.vutbr.web.css.CSSProperty;
import cz.vutbr.web.css.Declaration;
import cz.vutbr.web.css.NodeData;
import cz.vutbr.web.css.Rule;
import cz.vutbr.web.css.RuleFactory;
import cz.vutbr.web.css.RuleMargin;
import cz.vutbr.web.css.RulePage;
import cz.vutbr.web.css.Selector.PseudoElement;
import cz.vutbr.web.css.StyleSheet;
import cz.vutbr.web.css.SupportedCSS;
import cz.vutbr.web.css.Term;
import cz.vutbr.web.css.TermIdent;
import cz.vutbr.web.css.TermURI;
import cz.vutbr.web.csskit.antlr.CSSParserFactory;
import cz.vutbr.web.csskit.RuleFactoryImpl;
import cz.vutbr.web.domassign.DeclarationTransformer;
import org.daisy.braille.css.AnyAtRule;
import org.daisy.braille.css.BrailleCSSDeclarationTransformer;
import org.daisy.braille.css.BrailleCSSParserFactory;
import org.daisy.braille.css.BrailleCSSProperty;
import org.daisy.braille.css.BrailleCSSRuleFactory;
import org.daisy.braille.css.RuleCounterStyle;
import org.daisy.braille.css.RuleHyphenationResource;
import org.daisy.braille.css.RuleTextTransform;
import org.daisy.braille.css.RuleVolume;
import org.daisy.braille.css.RuleVolumeArea;
import org.daisy.braille.css.SelectorImpl.PseudoElementImpl;
import org.daisy.braille.css.SimpleInlineStyle;
import org.daisy.braille.css.SupportedBrailleCSS;
import org.daisy.common.file.URLs;
import org.daisy.common.transform.XMLTransformer;
import org.daisy.pipeline.braille.css.SupportedPrintCSS;
import org.daisy.pipeline.braille.css.impl.BrailleCssSerializer;
import org.daisy.pipeline.css.CssCascader;
import org.daisy.pipeline.css.CssPreProcessor;
import org.daisy.pipeline.css.JStyleParserCssCascader;
import org.daisy.pipeline.css.Medium;
import org.daisy.pipeline.css.XsltProcessor;
import org.osgi.service.component.annotations.Component;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
@Component(
name = "BrailleCssCascader",
service = { CssCascader.class }
)
public class BrailleCssCascader implements CssCascader {
/**
* Note that this implementation only supports a very small subset of medium "print", namely the
* properties color, font-style, font-weight, text-decoration.
*/
public boolean supportsMedium(Medium medium) {
switch (medium.getType()) {
case EMBOSSED:
case BRAILLE:
case PRINT:
return true;
default:
return false;
}
}
public XMLTransformer newInstance(Medium medium,
String userAndUserAgentStylesheets,
URIResolver uriResolver,
CssPreProcessor preProcessor,
XsltProcessor xsltProcessor,
QName attributeName,
boolean multipleAttrs) {
if (multipleAttrs)
throw new UnsupportedOperationException("Cascading to multiple attributes per element not supported");
if (attributeName == null)
throw new UnsupportedOperationException("A style attribute must be specified");
switch (medium.getType()) {
case EMBOSSED:
case BRAILLE:
return new Transformer(uriResolver, preProcessor, xsltProcessor, userAndUserAgentStylesheets, medium, attributeName,
brailleParserFactory, brailleRuleFactory, brailleCSS, brailleDeclarationTransformer);
case PRINT:
return new Transformer(uriResolver, preProcessor, xsltProcessor, userAndUserAgentStylesheets, medium, attributeName,
printParserFactory, printRuleFactory, printCSS, printDeclarationTransformer);
default:
throw new IllegalArgumentException("medium not supported: " + medium);
}
}
// medium print
private static final SupportedCSS printCSS = SupportedPrintCSS.getInstance();
private static DeclarationTransformer printDeclarationTransformer = new DeclarationTransformer(printCSS);
private static final RuleFactory printRuleFactory = RuleFactoryImpl.getInstance();
private static final CSSParserFactory printParserFactory = CSSParserFactory.getInstance();
// medium braille/embossed
private static final SupportedCSS brailleCSS = new SupportedBrailleCSS(false, true);
private static final DeclarationTransformer brailleDeclarationTransformer
= new BrailleCSSDeclarationTransformer(brailleCSS);
private static final RuleFactory brailleRuleFactory = new BrailleCSSRuleFactory();
private static final CSSParserFactory brailleParserFactory = new BrailleCSSParserFactory();
private static class Transformer extends JStyleParserCssCascader {
private final QName attributeName;
private final boolean isBrailleCss;
private Transformer(URIResolver resolver, CssPreProcessor preProcessor, XsltProcessor xsltProcessor,
String userAndUserAgentStyleSheets, Medium medium, QName attributeName,
CSSParserFactory parserFactory, RuleFactory ruleFactory,
SupportedCSS supportedCss, DeclarationTransformer declarationTransformer) {
super(resolver, preProcessor, xsltProcessor, userAndUserAgentStyleSheets, medium, attributeName,
parserFactory, ruleFactory, supportedCss, declarationTransformer);
this.attributeName = attributeName;
this.isBrailleCss = medium.getType() == Medium.Type.EMBOSSED || medium.getType() == Medium.Type.BRAILLE;
}
private Map> pageRules = null;
private Map> volumeRules = null;
private Iterable textTransformRules = null;
private Iterable hyphenationResourceRules = null;
private Iterable counterStyleRules = null;
private Iterable otherAtRules = null;
protected Map serializeStyle(NodeData mainStyle, Map pseudoStyles, Element context) {
if (isBrailleCss && pageRules == null) {
StyleSheet styleSheet = getParsedStyleSheet();
pageRules = new HashMap>(); {
for (RulePage r : Iterables.filter(styleSheet, RulePage.class)) {
String name = MoreObjects.firstNonNull(r.getName(), "auto");
String pseudo = MoreObjects.firstNonNull(r.getPseudo(), "");
Map pageRule = pageRules.get(name);
if (pageRule == null) {
pageRule = new HashMap();
pageRules.put(name, pageRule); }
if (pageRule.containsKey(pseudo))
pageRule.put(pseudo, makePageRule(name, "".equals(pseudo) ? null : pseudo,
ImmutableList.of(r, pageRule.get(pseudo))));
else
pageRule.put(pseudo, r);
}
}
volumeRules = new HashMap>(); {
for (RuleVolume r : Iterables.filter(styleSheet, RuleVolume.class)) {
String name = "auto";
String pseudo = MoreObjects.firstNonNull(r.getPseudo(), "");
if (pseudo.equals("nth(1)")) pseudo = "first";
else if (pseudo.equals("nth-last(1)")) pseudo = "last";
Map volumeRule = volumeRules.get(name);
if (volumeRule == null) {
volumeRule = new HashMap();
volumeRules.put(name, volumeRule); }
if (volumeRule.containsKey(pseudo))
volumeRule.put(pseudo, makeVolumeRule("".equals(pseudo) ? null : pseudo,
ImmutableList.of(r, volumeRule.get(pseudo))));
else
volumeRule.put(pseudo, r);
}
}
textTransformRules = Iterables.filter(styleSheet, RuleTextTransform.class);
hyphenationResourceRules = Iterables.filter(styleSheet, RuleHyphenationResource.class);
counterStyleRules = Iterables.filter(styleSheet, RuleCounterStyle.class);
otherAtRules = Iterables.filter(styleSheet, AnyAtRule.class);
}
StringBuilder style = new StringBuilder();
if (mainStyle != null)
insertStyle(style, mainStyle);
for (PseudoElement pseudo : sort(pseudoStyles.keySet(), pseudoElementComparator)) {
NodeData nd = pseudoStyles.get(pseudo);
if (nd != null)
insertPseudoStyle(style, nd, pseudo, pageRules);
}
if (isBrailleCss) {
boolean isRoot = (context.getParentNode().getNodeType() != Node.ELEMENT_NODE);
Map pageRule = getPageRule(mainStyle, pageRules);
if (pageRule != null) {
insertPageStyle(style, pageRule, true); }
else if (isRoot) {
pageRule = getPageRule("auto", pageRules);
if (pageRule != null)
insertPageStyle(style, pageRule, true); }
if (isRoot) {
Map volumeRule = getVolumeRule("auto", volumeRules);
if (volumeRule != null)
insertVolumeStyle(style, volumeRule, pageRules);
for (RuleTextTransform r : textTransformRules)
insertTextTransformDefinition(style, r);
for (RuleHyphenationResource r : hyphenationResourceRules)
insertHyphenationResourceDefinition(style, r);
for (RuleCounterStyle r : counterStyleRules)
insertCounterStyleDefinition(style, r);
for (AnyAtRule r : otherAtRules) {
if (style.length() > 0 && !style.toString().endsWith("} ")) {
style.insert(0, "{ ");
style.append("} "); }
insertAtRule(style, r); }}}
if (!style.toString().replaceAll("\\s+", "").isEmpty())
return ImmutableMap.of(attributeName, style.toString().trim());
else
return null;
}
protected String serializeValue(Term value) {
return BrailleCssSerializer.toString(value);
}
}
@SuppressWarnings("unused")
private static > Iterable sort(Iterable iterable) {
List list = new ArrayList();
for (T x : iterable)
list.add(x);
Collections.sort(list);
return list;
}
private static Iterable sort(Iterable iterable, Comparator comparator) {
List list = new ArrayList();
for (T x : iterable)
list.add(x);
Collections.sort(list, comparator);
return list;
}
private static Comparator pseudoElementComparator = new Comparator() {
public int compare(PseudoElement e1, PseudoElement e2) {
return e1.toString().compareTo(e2.toString());
}
};
// FIXME: move parts of this to BrailleCssSerializer
private static void insertStyle(StringBuilder builder, NodeData nodeData) {
List keys = new ArrayList(nodeData.getPropertyNames());
keys.remove("page");
Collections.sort(keys);
for (String key : keys) {
Term value = nodeData.getValue(key, false);
if (value != null)
builder.append(key).append(": ").append(BrailleCssSerializer.toString(value)).append("; ");
else {
CSSProperty prop = nodeData.getProperty(key, false);
if (prop != null) // can be null for unspecified inherited properties
builder.append(key).append(": ").append(prop).append("; "); }}
}
private static void pseudoElementToString(StringBuilder builder, PseudoElement elem) {
if (elem instanceof PseudoElementImpl) {
builder.append("&").append(elem);
return; }
else {
builder.append("&::").append(elem.getName());
String[] args = elem.getArguments();
if (args.length > 0) {
StringBuilder s = new StringBuilder();
Iterator it = Arrays.asList(args).iterator();
while (it.hasNext()) {
s.append(it.next());
if (it.hasNext()) s.append(", "); }
builder.append("(").append(s).append(")"); }}
}
private static void insertPseudoStyle(StringBuilder builder, NodeData nodeData, PseudoElement elem,
Map> pageRules) {
pseudoElementToString(builder, elem);
builder.append(" { ");
insertStyle(builder, nodeData);
Map pageRule = getPageRule(nodeData, pageRules);
if (pageRule != null)
insertPageStyle(builder, pageRule, false);
builder.append("} ");
}
private static void insertPageStyle(StringBuilder builder, Map pageRule, boolean topLevel) {
for (RulePage r : pageRule.values())
insertPageStyle(builder, r, topLevel);
}
private static void insertPageStyle(StringBuilder builder, RulePage pageRule, boolean topLevel) {
builder.append("@page");
String pseudo = pageRule.getPseudo();
if (pseudo != null && !"".equals(pseudo))
builder.append(":").append(pseudo);
builder.append(" { ");
for (Declaration decl : Iterables.filter(pageRule, Declaration.class))
insertDeclaration(builder, decl);
for (RuleMargin margin : Iterables.filter(pageRule, RuleMargin.class))
insertMarginStyle(builder, margin);
builder.append("} ");
}
private static void insertMarginStyle(StringBuilder builder, RuleMargin ruleMargin) {
builder.append("@").append(ruleMargin.getMarginArea()).append(" { ");
insertStyle(builder, new SimpleInlineStyle(ruleMargin, null, brailleDeclarationTransformer, brailleCSS));
builder.append("} ");
}
private static void insertDeclaration(StringBuilder builder, Declaration decl) {
StringBuilder s = new StringBuilder();
Iterator> it = decl.iterator();
while (it.hasNext()) {
s.append(BrailleCssSerializer.toString(it.next()));
if (it.hasNext()) s.append(" "); }
builder.append(decl.getProperty()).append(": ").append(s).append("; ");
}
private static Map getPageRule(NodeData nodeData, Map> pageRules) {
BrailleCSSProperty.Page pageProperty; {
if (nodeData != null)
pageProperty = nodeData.getProperty("page", false);
else
pageProperty = null;
}
String name; {
if (pageProperty != null) {
if (pageProperty == BrailleCSSProperty.Page.identifier)
name = nodeData.getValue(TermIdent.class, "page", false).getValue();
else
name = pageProperty.toString(); }
else
name = null;
}
if (name != null)
return getPageRule(name, pageRules);
else
return null;
}
private static Map getPageRule(String name, Map> pageRules) {
Map auto = pageRules == null ? null : pageRules.get("auto");
Map named = null;
if (!name.equals("auto"))
named = pageRules.get(name);
Map result = new HashMap();
List from;
RulePage r;
Set pseudos = new HashSet();
if (named != null)
pseudos.addAll(named.keySet());
if (auto != null)
pseudos.addAll(auto.keySet());
for (String pseudo : pseudos) {
boolean noPseudo = "".equals(pseudo);
from = new ArrayList();
if (named != null) {
r = named.get(pseudo);
if (r != null) from.add(r);
if (!noPseudo) {
r = named.get("");
if (r != null) from.add(r); }}
if (auto != null) {
r = auto.get(pseudo);
if (r != null) from.add(r);
if (!noPseudo) {
r = auto.get("");
if (r != null) from.add(r); }}
result.put(pseudo, makePageRule(name, noPseudo ? null : pseudo, from)); }
return result;
}
private static RulePage makePageRule(String name, String pseudo, List from) {
RulePage pageRule = brailleRuleFactory.createPage().setName(name).setPseudo(pseudo);
for (RulePage f : from)
for (Rule r : f)
if (r instanceof Declaration) {
Declaration d = (Declaration)r;
String property = d.getProperty();
if (getDeclaration(pageRule, property) == null)
pageRule.add(r); }
else if (r instanceof RuleMargin) {
RuleMargin m = (RuleMargin)r;
String marginArea = m.getMarginArea();
RuleMargin marginRule = getRuleMargin(pageRule, marginArea);
if (marginRule == null) {
marginRule = brailleRuleFactory.createMargin(marginArea);
pageRule.add(marginRule);
marginRule.replaceAll(m); }
else
for (Declaration d : m)
if (getDeclaration(marginRule, d.getProperty()) == null)
marginRule.add(d); }
return pageRule;
}
private static Declaration getDeclaration(Collection> rule, String property) {
for (Declaration d : Iterables.filter(rule, Declaration.class))
if (d.getProperty().equals(property))
return d;
return null;
}
private static RuleMargin getRuleMargin(Collection> rule, String marginArea) {
for (RuleMargin m : Iterables.filter(rule, RuleMargin.class))
if (m.getMarginArea().equals(marginArea))
return m;
return null;
}
private static void insertVolumeStyle(StringBuilder builder, Map volumeRule, Map> pageRules) {
for (Map.Entry r : volumeRule.entrySet())
insertVolumeStyle(builder, r, pageRules);
}
private static void insertVolumeStyle(StringBuilder builder, Map.Entry volumeRule, Map> pageRules) {
builder.append("@volume");
String pseudo = volumeRule.getKey();
if (pseudo != null && !"".equals(pseudo))
builder.append(":").append(pseudo);
builder.append(" { ");
for (Declaration decl : Iterables.filter(volumeRule.getValue(), Declaration.class))
insertDeclaration(builder, decl);
for (RuleVolumeArea volumeArea : Iterables.filter(volumeRule.getValue(), RuleVolumeArea.class))
insertVolumeAreaStyle(builder, volumeArea, pageRules);
builder.append("} ");
}
private static void insertVolumeAreaStyle(StringBuilder builder, RuleVolumeArea ruleVolumeArea, Map> pageRules) {
builder.append("@").append(ruleVolumeArea.getVolumeArea().value).append(" { ");
StringBuilder innerStyle = new StringBuilder();
Map pageRule = null;
for (Declaration decl : Iterables.filter(ruleVolumeArea, Declaration.class))
if ("page".equals(decl.getProperty())) {
StringBuilder s = new StringBuilder();
Iterator> it = decl.iterator();
while (it.hasNext()) {
s.append(BrailleCssSerializer.toString(it.next()));
if (it.hasNext()) s.append(" "); }
pageRule = getPageRule(s.toString(), pageRules); }
else
insertDeclaration(innerStyle, decl);
if (pageRule != null)
insertPageStyle(innerStyle, pageRule, false);
builder.append(innerStyle).append("} ");
}
private static void insertTextTransformDefinition(StringBuilder builder, RuleTextTransform rule) {
builder.append("@text-transform");
String name = rule.getName();
if (name != null) builder.append(' ').append(name);
builder.append(" { ");
for (Declaration decl : rule) {
if (decl.size() == 1 && decl.get(0) instanceof TermURI) {
TermURI term = (TermURI)decl.get(0);
URI uri = URLs.asURI(term.getValue());
if (!uri.isAbsolute() && !uri.getSchemeSpecificPart().startsWith("/")) {
// relative resource: make absolute and convert to "volatile-file" URI to bypass
// caching in AbstractTransformProvider
if (term.getBase() != null)
uri = URLs.resolve(URLs.asURI(term.getBase()), uri);
try {
new File(uri);
try {
uri = new URI("volatile-file", uri.getSchemeSpecificPart(), uri.getFragment());
} catch (URISyntaxException e) {
throw new IllegalStateException(e); // should not happen
}
} catch (IllegalArgumentException e) {
// not a file URI
}
}
builder.append(decl.getProperty()).append(": ").append("url(\"" + uri + "\")").append("; ");
continue;
}
insertDeclaration(builder, decl);
}
builder.append("} ");
}
private static void insertHyphenationResourceDefinition(StringBuilder builder, RuleHyphenationResource rule) {
builder.append("@hyphenation-resource");
builder.append(":lang(").append(BrailleCssSerializer.serializeLanguageRanges(rule.getLanguageRanges())).append(")");
builder.append(" { ");
for (Declaration decl : rule) {
if (decl.size() == 1 && decl.get(0) instanceof TermURI) {
TermURI term = (TermURI)decl.get(0);
URI uri = URLs.asURI(term.getValue());
if (!uri.isAbsolute() && !uri.getSchemeSpecificPart().startsWith("/")) {
// relative resource: make absolute and convert to "volatile-file" URI to bypass
// caching in AbstractTransformProvider
if (term.getBase() != null)
uri = URLs.resolve(URLs.asURI(term.getBase()), uri);
try {
new File(uri);
try {
uri = new URI("volatile-file", uri.getSchemeSpecificPart(), uri.getFragment());
} catch (URISyntaxException e) {
throw new IllegalStateException(e); // should not happen
}
} catch (IllegalArgumentException e) {
// not a file URI
}
}
builder.append(decl.getProperty()).append(": ").append("url(\"" + uri + "\")").append("; ");
continue;
}
insertDeclaration(builder, decl);
}
builder.append("} ");
}
private static void insertCounterStyleDefinition(StringBuilder builder, RuleCounterStyle rule) {
String name = rule.getName();
builder.append("@counter-style ").append(name).append(" { ");
for (Declaration decl : rule)
insertDeclaration(builder, decl);
builder.append("} ");
}
private static void insertAtRule(StringBuilder builder, AnyAtRule rule) {
builder.append("@").append(rule.getName()).append(" { ");
for (Declaration decl : Iterables.filter(rule, Declaration.class))
insertDeclaration(builder, decl);
for (AnyAtRule r : Iterables.filter(rule, AnyAtRule.class))
insertAtRule(builder, r);
builder.append("} ");
}
private static Map getVolumeRule(String name, Map> volumeRules) {
Map auto = volumeRules.get("auto");
Map named = null;
if (!name.equals("auto"))
named = volumeRules.get(name);
Map result = new HashMap();
List from;
RuleVolume r;
Set pseudos = new HashSet();
if (named != null)
pseudos.addAll(named.keySet());
if (auto != null)
pseudos.addAll(auto.keySet());
// Create a special rule for volumes that match both :first and :last (i.e. for the case
// there is only a single volume)
// FIXME: The order in which rules are defined currently does not affect the
// precedence. ':first' rules always override ':last' rules.
if (pseudos.contains("first") && pseudos.contains("last"))
pseudos.add("only");
for (String pseudo : pseudos) {
from = new ArrayList();
if (named != null) {
r = named.get(pseudo);
if (r != null) from.add(r);
if ("only".equals(pseudo)) {
r = named.get("first");
if (r != null) from.add(r);
r = named.get("last");
if (r != null) from.add(r); }
if (!"".equals(pseudo)) {
r = named.get("");
if (r != null) from.add(r); }}
if (auto != null) {
r = auto.get(pseudo);
if (r != null) from.add(r);
if ("only".equals(pseudo)) {
r = auto.get("first");
if (r != null) from.add(r);
r = auto.get("last");
if (r != null) from.add(r); }
if (!"".equals(pseudo)) {
r = auto.get("");
if (r != null) from.add(r); }}
result.put(pseudo,
makeVolumeRule(
// "only" is not a valid pseudo name so we drop it. The value we pass to
// makeVolumeRule() does not matter anyway as long as we use the
// corresponding key of the map where we store the volume rule to
// serialize the rule.
("".equals(pseudo) || "only".equals(pseudo)) ? null : pseudo,
from)); }
return result;
}
private static final Pattern FUNCTION = Pattern.compile("(nth|nth-last)\\(([1-9][0-9]*)\\)");
private static RuleVolume makeVolumeRule(String pseudo, List from) {
String arg = null;
if (pseudo != null) {
Matcher m = FUNCTION.matcher(pseudo);
if (m.matches()) {
pseudo = m.group(1);
arg = m.group(2); }}
RuleVolume volumeRule = new RuleVolume(pseudo, arg);
for (RuleVolume f : from)
for (Rule r : f)
if (r instanceof Declaration) {
Declaration d = (Declaration)r;
String property = d.getProperty();
if (getDeclaration(volumeRule, property) == null)
volumeRule.add(r); }
else if (r instanceof RuleVolumeArea) {
RuleVolumeArea a = (RuleVolumeArea)r;
String volumeArea = a.getVolumeArea().value;
RuleVolumeArea volumeAreaRule = getRuleVolumeArea(volumeRule, volumeArea);
if (volumeAreaRule == null) {
volumeAreaRule = new RuleVolumeArea(volumeArea);
volumeRule.add(volumeAreaRule);
volumeAreaRule.replaceAll(a); }
else
for (Declaration d : Iterables.filter(a, Declaration.class))
if (getDeclaration(volumeAreaRule, d.getProperty()) == null)
volumeAreaRule.add(d); }
return volumeRule;
}
private static RuleVolumeArea getRuleVolumeArea(Collection> rule, String volumeArea) {
for (RuleVolumeArea m : Iterables.filter(rule, RuleVolumeArea.class))
if (m.getVolumeArea().value.equals(volumeArea))
return m;
return null;
}
}
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