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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Eclipse Public License, Version 1.0 (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.eclipse.org/org/documents/epl-v10.php
*
* 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.android.ide.eclipse.adt.internal.editors.layout;
import static com.android.SdkConstants.ATTR_LAYOUT;
import static com.android.SdkConstants.ATTR_LAYOUT_HEIGHT;
import static com.android.SdkConstants.ATTR_LAYOUT_WIDTH;
import static com.android.SdkConstants.VALUE_FILL_PARENT;
import static com.android.SdkConstants.VALUE_MATCH_PARENT;
import static com.android.SdkConstants.VIEW_FRAGMENT;
import static com.android.SdkConstants.VIEW_INCLUDE;
import static com.android.ide.eclipse.adt.internal.editors.layout.gle2.LayoutMetadata.KEY_FRAGMENT_LAYOUT;
import com.android.SdkConstants;
import com.android.ide.common.rendering.api.ILayoutPullParser;
import com.android.ide.common.rendering.api.IProjectCallback;
import com.android.ide.eclipse.adt.AdtUtils;
import com.android.ide.eclipse.adt.internal.editors.layout.gle2.LayoutMetadata;
import org.kxml2.io.KXmlParser;
import java.io.File;
/**
* Modified {@link KXmlParser} that adds the methods of {@link ILayoutPullParser}, and
* performs other layout-specific parser behavior like translating fragment tags into
* include tags.
* <p/>
* It will return a given parser when queried for one through
* {@link ILayoutPullParser#getParser(String)} for a given name.
*
*/
public class ContextPullParser extends KXmlParser implements ILayoutPullParser {
private static final String COMMENT_PREFIX = "<!--"; //$NON-NLS-1$
private static final String COMMENT_SUFFIX = "-->"; //$NON-NLS-1$
/** The callback to request parsers from */
private final IProjectCallback mProjectCallback;
/** The {@link File} for the layout currently being parsed */
private File mFile;
/** The layout to be shown for the current {@code <fragment>} tag. Usually null. */
private String mFragmentLayout = null;
/**
* Creates a new {@link ContextPullParser}
*
* @param projectCallback the associated callback
* @param file the file to be parsed
*/
public ContextPullParser(IProjectCallback projectCallback, File file) {
super();
mProjectCallback = projectCallback;
mFile = file;
}
// --- Layout lib API methods
@Override
/**
* this is deprecated but must still be implemented for older layout libraries.
* @deprecated use {@link IProjectCallback#getParser(String)}.
*/
@Deprecated
public ILayoutPullParser getParser(String layoutName) {
return mProjectCallback.getParser(layoutName);
}
@Override
public Object getViewCookie() {
return null; // never any key to return
}
// --- KXMLParser override
@Override
public String getName() {
String name = super.getName();
// At designtime, replace fragments with includes.
if (name.equals(VIEW_FRAGMENT)) {
mFragmentLayout = LayoutMetadata.getProperty(this, KEY_FRAGMENT_LAYOUT);
if (mFragmentLayout != null) {
return VIEW_INCLUDE;
}
} else {
mFragmentLayout = null;
}
return name;
}
@Override
public String getAttributeValue(String namespace, String localName) {
if (localName.equals(ATTR_LAYOUT) && mFragmentLayout != null) {
return mFragmentLayout;
}
String value = super.getAttributeValue(namespace, localName);
// on the fly convert match_parent to fill_parent for compatibility with older
// platforms.
if (VALUE_MATCH_PARENT.equals(value) &&
(ATTR_LAYOUT_WIDTH.equals(localName) ||
ATTR_LAYOUT_HEIGHT.equals(localName)) &&
SdkConstants.NS_RESOURCES.equals(namespace)) {
return VALUE_FILL_PARENT;
}
// Handle unicode escapes
if (value != null && value.indexOf('\\') != -1) {
value = AdtUtils.replaceUnicodeEscapes(value);
}
return value;
}
}
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