com.google.gwt.resources.css.ExternalClassesCollector Maven / Gradle / Ivy
The newest version!
/*
* Copyright 2009 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.resources.css;
import com.google.gwt.resources.css.ast.Context;
import com.google.gwt.resources.css.ast.CssExternalSelectors;
import com.google.gwt.resources.css.ast.CssSelector;
import com.google.gwt.resources.css.ast.CssVisitor;
import java.util.HashSet;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;
import java.util.regex.Matcher;
/**
* Collects all {@code @external} declarations in the stylesheet. This visitor
* will expand tail-globs.
*/
public class ExternalClassesCollector extends CssVisitor {
public static final String GLOB_STRING = "*";
private final SortedSet allClasses = new TreeSet();
private final SortedSet externalClasses = new TreeSet();
private final Set globs = new HashSet();
/**
* This is a short-circuit for {@literal @external} *
.
*/
private boolean matchAll;
@Override
public void endVisit(CssExternalSelectors x, Context ctx) {
if (matchAll) {
return;
}
for (String selector : x.getClasses()) {
if (selector.equals(GLOB_STRING)) {
matchAll = true;
return;
} else if (selector.endsWith(GLOB_STRING)) {
globs.add(selector.substring(0, selector.length() - 1));
} else {
externalClasses.add(selector);
}
}
}
@Override
public void endVisit(CssSelector x, Context ctx) {
Matcher m = CssSelector.CLASS_SELECTOR_PATTERN.matcher(x.getSelector());
while (m.find()) {
allClasses.add(m.group(1));
}
}
public SortedSet getClasses() {
if (matchAll) {
return allClasses;
}
glob : for (String glob : globs) {
for (String clazz : allClasses.tailSet(glob)) {
if (clazz.startsWith(glob)) {
externalClasses.add(clazz);
} else {
continue glob;
}
}
}
return externalClasses;
}
}