/*
* Copyright 2014 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.dev.js;
import com.google.gwt.core.ext.BadPropertyValueException;
import com.google.gwt.core.ext.ConfigurationProperty;
import com.google.gwt.core.ext.PropertyOracle;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Set;
/**
* Holds the list of JavaScript identifiers that have special meaning, so they shouldn't be used
* in a GWT program. (Unless used deliberately in JavaScript.)
*/
class ReservedNames {
static final String BLACKLIST = "js.identifier.blacklist";
static final String BLACKLIST_SUFFIXES = "js.identifier.blacklist.suffixes";
private final Set<String> blacklistedIdents;
private final List<String> blacklistedSuffixes;
ReservedNames(PropertyOracle[] propertyOracles) {
Set<String> blacklist = new HashSet<String>();
List<String> blacklistSuffixes = new ArrayList<String>();
if (propertyOracles != null) {
for (PropertyOracle propOracle : propertyOracles) {
maybeAddToBlacklist(BLACKLIST, blacklist, propOracle);
maybeAddToBlacklist(BLACKLIST_SUFFIXES, blacklistSuffixes, propOracle);
}
}
blacklistedIdents = Collections.unmodifiableSet(blacklist);
blacklistedSuffixes = Collections.unmodifiableList(blacklistSuffixes);
}
private void maybeAddToBlacklist(String propName, Collection<String> blacklist,
PropertyOracle propOracle) {
try {
ConfigurationProperty configProp =
propOracle.getConfigurationProperty(propName);
// supports multivalue property
for (String bannedSymbols : configProp.getValues()) {
// and comma separated list
String [] idents = bannedSymbols.split(",");
for (String ident : idents) {
String trimmedIdent = ident.trim();
if (trimmedIdent.length() > 0) {
blacklist.add(trimmedIdent);
}
}
}
} catch (BadPropertyValueException e) {
// thrown if not set to anything
}
}
final boolean isAvailable(String newIdent) {
if (!JsProtectedNames.isLegalName(newIdent)) {
return false;
}
String lcIdent = newIdent.toLowerCase(Locale.ENGLISH);
for (String suffix : blacklistedSuffixes) {
if (lcIdent.endsWith(suffix.toLowerCase(Locale.ENGLISH))) {
return false;
}
}
return !blacklistedIdents.contains(newIdent);
}
}