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/*******************************************************************************
* Copyright (c) 2006, 2010 Sybase, Inc. and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Sybase, Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.jst.pagedesigner.utils;
import java.util.Arrays;
import org.eclipse.jst.pagedesigner.IHTMLConstants;
import org.w3c.dom.Text;
/**
* @author mengbo
*/
public class HTMLUtil {
/**
* check whether a char is a HTML whitespace.
*
* @param ch
* @return true if ch is considered to be HTML whitespace
* @see <a href="http://www.w3.org/TR/html4/struct/text.html#h-9.1">white
* space </a>
*/
public static boolean isHTMLWhitespace(char ch) {
return ch == ' ' || ch == 0x09 || ch == 0x0c || ch == 0x0d
|| ch == 0x0a || ch == 0x200b;
}
/**
* @param text
* @return true if the entire string is considered to be HTML whitespace
*/
public static boolean isHTMLWhitespaceString(String text) {
for (int i = 0, size = text.length(); i < size; i++) {
if (!isHTMLWhitespace(text.charAt(i))) {
return false;
}
}
return true;
}
/**
* the HTML tags considered to be hidden
*/
static final String[] HiddenTags = new String[] {
IHTMLConstants.TAG_APPLET,
IHTMLConstants.TAG_AREA,
IHTMLConstants.TAG_BASE,
IHTMLConstants.TAG_BASEFONT,
IHTMLConstants.TAG_HEAD,
IHTMLConstants.TAG_IFRAME,
IHTMLConstants.TAG_ISINDEX,
IHTMLConstants.TAG_LINK,
IHTMLConstants.TAG_META,
IHTMLConstants.TAG_NOEMBED,
IHTMLConstants.TAG_NOFRAMES,
IHTMLConstants.TAG_NOSCRIPT,
IHTMLConstants.TAG_SCRIPT,
IHTMLConstants.TAG_STYLE,
IHTMLConstants.TAG_TITLE,
IHTMLConstants.TAG_PARAM };
/**
* @param tag
* @return true if the tag name is not in the list of hidden tags
*/
public static boolean isVisualHtmlElement(String tag) {
return !Arrays.asList(HiddenTags).contains(tag.toLowerCase());
}
/**
* Handling white space. Basically, for leading and trailing whitespace,
* will handle according whether the text is just after tag start or before
* tag close.
* <p>
* For consequent whitespace, will compact them.
* @param textNode
* @param s
* @return the compacted string
* see http://www.w3.org/TR/html4/struct/text.html#h-9.1
*/
// XXX: currently, the whitespace handling is in this class, in the future
// may consider move it
// into lower layer (display/CSS layer)
public static String compactWhitespaces(Text textNode, String s) {
char[] array = s.toCharArray();
StringBuffer buffer = new StringBuffer(array.length);
int posi = 0;
int len = array.length;
while (posi < len) {
if (HTMLUtil.isHTMLWhitespace(array[posi])) {
while (++posi < len && HTMLUtil.isHTMLWhitespace(array[posi]))
{
// no body
// loop until we have find non-whitepspace or endof array
}
buffer.append(' ');
continue;
}
buffer.append(array[posi++]);
continue;
}
return buffer.toString();
}
}
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