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/*******************************************************************************
* Copyright (c) 2004, 2013 John Krasnay and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* John Krasnay - initial API and implementation
* Carsten Hiesserich - removed 'none' from valid values
*******************************************************************************/
package org.eclipse.vex.core.internal.css;
import org.eclipse.vex.core.provisional.dom.INode;
import org.w3c.css.sac.LexicalUnit;
/**
* The CSS 'display' property.
*/
public class DisplayProperty extends AbstractProperty {
public static final String DEFAULT = CSS.BLOCK;
public DisplayProperty() {
super(CSS.DISPLAY);
}
public Object calculate(final LexicalUnit lu, final Styles parentStyles, final Styles styles, final INode node) {
if (isDisplay(lu)) {
return lu.getStringValue();
} else if (isInherit(lu) && parentStyles != null) {
return parentStyles.getDisplay();
} else {
// not specified or other unknown value
return DEFAULT;
}
}
// ======================================================== PRIVATE
/**
* Returns true if the value of the given LexicalUnit represents a valid value for this property.
*
* @param lu
* LexicalUnit to inspect.
*/
private static boolean isDisplay(final LexicalUnit lu) {
if (lu == null) {
return false;
} else if (lu.getLexicalUnitType() == LexicalUnit.SAC_IDENT) {
final String s = lu.getStringValue();
return s.equals(CSS.BLOCK) || s.equals(CSS.INLINE) || s.equals(CSS.INLINE_BLOCK) || s.equals(CSS.INLINE_TABLE) || s.equals(CSS.LIST_ITEM) || s.equals(CSS.RUN_IN) || s.equals(CSS.TABLE)
|| s.equals(CSS.TABLE_CAPTION) || s.equals(CSS.TABLE_CELL) || s.equals(CSS.TABLE_COLUMN) || s.equals(CSS.TABLE_COLUMN_GROUP) || s.equals(CSS.TABLE_FOOTER_GROUP)
|| s.equals(CSS.TABLE_HEADER_GROUP) || s.equals(CSS.TABLE_ROW) || s.equals(CSS.TABLE_ROW_GROUP);
} else {
return false;
}
}
}
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