org.daisy.pipeline.css.impl.StylesheetParametersParser Maven / Gradle / Ivy
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package org.daisy.pipeline.css.impl;
import java.util.AbstractCollection;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.google.common.collect.Iterables;
import org.daisy.pipeline.css.sass.impl.SassMapParser;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.unbescape.css.CssEscape;
public abstract class StylesheetParametersParser {
private static final Logger logger = LoggerFactory.getLogger(StylesheetParametersParser.class);
private static final Pattern regex = Pattern.compile(
(SassMapParser.asRegex().pattern() + "|" + Query.QUERY.pattern()).replaceAll("\\(\\?<[^>]+>", "(?:"));
private StylesheetParametersParser() {}
public static Map parse(String expression) throws IllegalArgumentException {
Map map = null;
try {
map = SassMapParser.parse(expression);
} catch (IllegalArgumentException e) {
Query query = null; {
try {
query = Query.parse(expression);
logger.warn(
"Query syntax is deprecated for stylesheet-parameters. Please use Sass map syntax.");
} catch (IllegalArgumentException ee) {
}
}
if (query != null) {
map = new HashMap<>();
for (Query.Feature f : query)
map.put(f.getKey(), f.getValue().orElse("true"));
}
}
if (map == null)
throw new IllegalArgumentException("Could not parse stylesheet parameter set: " + expression);
return map;
}
public static Pattern asRegex() {
return regex;
}
/*
* The code below is copied from the Query class in braille-common. The class is not referenced
* because css-utils is a dependency of braille-common. For now we chose to copy rather than to
* move the class because the query syntax was introduced as a way to select braille
* transformers. Later we started using it to parse "stylesheet-parameter" options also, but
* only because it was convenient. Now we have a different syntax for stylesheet parameters,
* namely the Sass map syntax. For backward compatibility the query syntax is also still supported.
*/
private static class Query extends AbstractCollection {
private static final String IDENT_RE = "[_a-zA-Z][_a-zA-Z0-9-]*";
private static final String STRING_RE = "'[^']*'|\"[^\"]*\"";
private static final String INTEGER_RE = "0|-?[1-9][0-9]*";
private static final Pattern VALUE_RE = Pattern.compile(
"(?" + IDENT_RE + ")|(?" + STRING_RE + ")|(?" + INTEGER_RE + ")"
);
private static final Pattern FEATURE_RE = Pattern.compile(
"\\(\\s*(?" + IDENT_RE + ")(?:\\s*\\:\\s*(?" + VALUE_RE.pattern() + "))?\\s*\\)"
);
private static final Pattern FEATURES_RE = Pattern.compile(
"\\s*(?:" + FEATURE_RE.pattern() + "\\s*)*"
);
private static final Pattern QUERY = FEATURES_RE;
/**
* Parse string to query
*/
public static Query parse(String query) throws IllegalArgumentException {
if (FEATURES_RE.matcher(query).matches()) {
Query q = new Query();
Matcher m = FEATURE_RE.matcher(query);
while (m.find()) {
String key = m.group("key");
String value = m.group("value");
boolean isString = false;
if (value != null) {
Matcher m2 = VALUE_RE.matcher(value);
if (!m2.matches())
throw new RuntimeException("Coding error");
String ident = m2.group("ident");
String string = m2.group("string");
String integer = m2.group("integer");
if (ident != null)
value = ident;
else if (string != null && !string.equals("")) {
value = CssEscape.unescapeCss(string.substring(1, string.length() - 1));
isString = true; }
else if (integer != null && !integer.equals(""))
value = integer;
else
throw new RuntimeException("Coding error"); }
q.add(new Feature(key, Optional.ofNullable(value), isString)); }
return q; }
throw new IllegalArgumentException("Could not parse query: " + query);
}
private final List list;
private Query() {
this.list = new ArrayList();
}
@Override
public boolean add(Feature feature) {
int index = 0;
String key = feature.getKey();
for (Feature f : list) {
int cmp = f.getKey().compareTo(key);
if (cmp > 0) {
break;
} else if (cmp > 0) {
index++;
break;
}
index++;
}
list.add(index, feature);
return true;
}
@Override
public int size() {
return list.size();
}
@Override
public Iterator iterator() {
return list.iterator();
}
@Override
public String toString() {
StringBuilder b = new StringBuilder();
for (Feature f : this)
b.append(f);
return b.toString();
}
@Override
public int hashCode() {
return list.hashCode();
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (!(obj instanceof Query))
return false;
return Iterables.elementsEqual(this, (Query)obj);
}
private static class Feature {
private final String key;
private final Optional value;
private final Optional literal;
private Feature(String key, Optional value) {
this(key, value, false);
}
private Feature(String key, Optional value, boolean specifiedAsString) {
this.key = key;
this.value = value;
if (value.isPresent()) {
String v = value.get();
if (!specifiedAsString && (v.matches(IDENT_RE) || v.matches(INTEGER_RE)))
this.literal = Optional.of(v);
else
this.literal = Optional.of("\"" + v.replace("\n", "\\A ").replace("\"","\\22 ") + "\"");
} else
this.literal = Optional.empty();
}
public String getKey() {
return key;
}
public boolean hasValue() {
return getValue().isPresent();
}
public Optional getValue() {
return value;
}
public Optional getLiteral() {
return literal;
}
@Override
public String toString() {
StringBuilder b = new StringBuilder();
String k = getKey();
if (!k.matches(IDENT_RE))
throw new RuntimeException();
b.append("(" + k);
if (hasValue()) {
b.append(":");
b.append(getLiteral().get());
}
b.append(")");
return b.toString();
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((key == null) ? 0 : key.hashCode());
result = prime * result + ((value == null) ? 0 : value.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Feature other = (Feature)obj;
if (key == null) {
if (other.getKey() != null)
return false;
} else if (!key.equals(other.getKey()))
return false;
if (value == null) {
if (other.getValue() != null)
return false;
} else if (!value.equals(other.getValue()))
return false;
return true;
}
}
}
}