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/*
* Copyright 2008 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.uibinder.elementparsers;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.safehtml.shared.SafeHtml;
import com.google.gwt.uibinder.rebind.FieldWriter;
import com.google.gwt.uibinder.rebind.UiBinderWriter;
import com.google.gwt.uibinder.rebind.XMLAttribute;
import com.google.gwt.uibinder.rebind.XMLElement;
import com.google.gwt.uibinder.rebind.XMLElement.Interpreter;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
/**
* This is the most generally useful interpreter, and the most likely to be used
* by a custom parser when calling {@link XMLElement#consumeInnerHtml}.
*
*
Assigns computed values to element attributes (e.g.
* class="{style.pretty}")
*
Generates fields to hold named dom elements (e.g. <div
* gwt:field="importantDiv">)
*
Turns <ui:msg> and <ui:attr> elements into methods on a
* generated Messages interface
*
Fails if any element encountered is a widget
*
*/
public class HtmlInterpreter implements XMLElement.Interpreter {
private class AttributeTypist implements ComputedAttributeInterpreter.Delegate {
@Override
public String getAttributeToken(XMLAttribute attribute) throws UnableToCompleteException {
if (URI_ATTRIBUTES.contains(attribute.getLocalName())) {
return writer.tokenForSafeUriExpression(attribute.getElement(),
attribute.consumeSafeUriOrStringAttribute());
}
return writer.tokenForStringExpression(attribute.getElement(), attribute.consumeStringValue());
}
}
private static final Set URI_ATTRIBUTES;
static {
/*
* Perhaps we "should" check the element names as well, but the spec implies
* that an attribute name always has the same meaning wherever it appears.
* It's less work this way, and we're more likely to catch new elements.
*
* http://dev.w3.org/html5/spec/index.html#attributes-1
* http://www.w3.org/TR/REC-html40/index/attributes.html
*/
String[] urlAttributes =
{
"action", "background", "classid", "cite", "codebase", "data", "formaction", "href",
"icon", "longdesc", "manifest", "profile", "poster", "src", "usemap"};
URI_ATTRIBUTES = Collections.unmodifiableSet(new HashSet(Arrays.asList(urlAttributes)));
}
/**
* A convenience factory method for the most common use of this class, to work
* with HTML that will eventually be rendered under a
* {@link com.google.gwt.user.client.ui.UIObject} (or really, any object that
* responds to getElement()). Uses an instance of
* {@link HtmlMessageInterpreter} to process message elements.
*
* @param uiExpression An expression that can be evaluated at runtime to find
* an object whose getElement() method can be called to get an
* ancestor of all Elements generated from the interpreted HTML.
*/
public static HtmlInterpreter newInterpreterForUiObject(UiBinderWriter writer, String uiExpression) {
String ancestorExpression =
writer.useLazyWidgetBuilders() ? uiExpression : uiExpression + ".getElement()";
return new HtmlInterpreter(writer, ancestorExpression, new HtmlMessageInterpreter(writer,
ancestorExpression));
}
private final UiBinderWriter writer;
private final InterpreterPipe pipe;
/**
* Rather than using this constructor, you probably want to use the
* {@link #newInterpreterForUiObject} factory method.
*
* @param ancestorExpression An expression that can be evaluated at runtime to
* find an Element that will be an ancestor of all Elements generated
* from the interpreted HTML.
* @param messageInterpreter an interpreter to handle msg and ph elements,
* typically an instance of {@link HtmlMessageInterpreter}. This
* interpreter gets last crack
*/
public HtmlInterpreter(UiBinderWriter writer, String ancestorExpression,
Interpreter messageInterpreter) {
this.writer = writer;
this.pipe = new InterpreterPipe();
pipe.add(new FieldInterpreter(writer, ancestorExpression));
/*
* UiTextInterpreter and UiSafeHtmlInterpreter must be invoked before
* ComputedAttributeInterpreter to function properly
*/
pipe.add(new UiTextInterpreter(writer));
pipe.add(new UiSafeHtmlInterpreter(writer));
pipe.add(new ComputedAttributeInterpreter(writer, new AttributeTypist()));
pipe.add(new AttributeMessageInterpreter(writer));
pipe.add(messageInterpreter);
}
public String interpretElement(XMLElement elem) throws UnableToCompleteException {
if (writer.useLazyWidgetBuilders() && writer.isElementAssignableTo(elem, SafeHtml.class)) {
FieldWriter childField = writer.parseElementToField(elem);
return writer.tokenForSafeHtmlExpression(elem, childField.getNextReference());
}
if (writer.isImportedElement(elem)) {
writer.die(elem, "Not allowed in an HTML context");
}
if (elem.getNamespaceUri() != null && !writer.isBinderElement(elem)) {
// It's not a widget, and it's not a ui: element.
writer.die(elem, "Prefix \"%s:\" has unrecognized xmlns \"%s\" (bad import?)",
elem.getPrefix(), elem.getNamespaceUri());
}
return pipe.interpretElement(elem);
}
}
