/*
* 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.core.ext.TreeLogger;
import com.google.gwt.core.ext.typeinfo.JClassType;
import com.google.gwt.core.ext.typeinfo.NotFoundException;
import com.google.gwt.resources.client.DataResource;
import com.google.gwt.resources.css.ast.Context;
import com.google.gwt.resources.css.ast.CssCompilerException;
import com.google.gwt.resources.css.ast.CssDef;
import com.google.gwt.resources.css.ast.CssProperty;
import com.google.gwt.resources.css.ast.CssUrl;
import com.google.gwt.resources.css.ast.CssVisitor;
import com.google.gwt.resources.css.ast.CssProperty.DotPathValue;
import com.google.gwt.resources.css.ast.CssProperty.ExpressionValue;
import com.google.gwt.resources.css.ast.CssProperty.IdentValue;
import com.google.gwt.resources.css.ast.CssProperty.ListValue;
import com.google.gwt.resources.css.ast.CssProperty.Value;
import com.google.gwt.resources.ext.ResourceContext;
import com.google.gwt.resources.ext.ResourceGeneratorUtil;
import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
/**
* Substitute symbolic replacements into string values.
*/
public class SubstitutionReplacer extends CssVisitor {
private final ResourceContext context;
private final JClassType dataResourceType;
private final TreeLogger logger;
private final Map<String, CssDef> substitutions;
public SubstitutionReplacer(TreeLogger logger, ResourceContext context,
Map<String, CssDef> substitutions) {
this.context = context;
this.dataResourceType = context.getGeneratorContext().getTypeOracle().findType(
DataResource.class.getCanonicalName());
this.logger = logger;
this.substitutions = substitutions;
}
@Override
public void endVisit(CssProperty x, Context ctx) {
if (x.getValues() == null) {
// Nothing to do
return;
}
List<Value> values = new ArrayList<Value>(x.getValues().getValues());
for (ListIterator<Value> i = values.listIterator(); i.hasNext();) {
IdentValue v = i.next().isIdentValue();
if (v == null) {
// Don't try to substitute into anything other than idents
continue;
}
String value = v.getIdent();
CssDef def = substitutions.get(value);
if (def == null) {
continue;
} else if (def instanceof CssUrl) {
assert def.getValues().size() == 1;
assert def.getValues().get(0).isDotPathValue() != null;
DotPathValue functionName = def.getValues().get(0).isDotPathValue();
try {
ResourceGeneratorUtil.getMethodByPath(context.getClientBundleType(),
functionName.getParts(), dataResourceType);
} catch (NotFoundException e) {
logger.log(TreeLogger.ERROR, e.getMessage());
throw new CssCompilerException("Cannot find data method");
}
String instance = "((" + DataResource.class.getName() + ")("
+ context.getImplementationSimpleSourceName() + ".this."
+ functionName.getExpression() + "))";
StringBuilder expression = new StringBuilder();
expression.append("\"url('\" + ");
expression.append(instance).append(".getUrl()");
expression.append(" + \"')\"");
i.set(new ExpressionValue(expression.toString()));
} else {
i.remove();
for (Value defValue : def.getValues()) {
i.add(defValue);
}
}
}
x.setValue(new ListValue(values));
}
}