Back to index...

	/*
	* Copyright (c) 2015, 2017 Oracle and/or its affiliates. All rights reserved.
	*/
	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You 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.
	*/

	// Aug 21, 2000:
	// Fixed bug in isElement and made HTMLdtd public.
	// Contributed by Eric SCHAEFFER" <eschaeffer@posterconseil.com>


	package com.sun.org.apache.xml.internal.serialize;

	import com.sun.org.apache.xerces.internal.dom.DOMMessageFormatter;
	import java.io.BufferedReader;
	import java.io.InputStream;
	import java.io.InputStreamReader;
	import java.util.HashMap;
	import java.util.Locale;
	import java.util.Map;


	/**
	* Utility class for accessing information specific to HTML documents.
	* The HTML DTD is expressed as three utility function groups. Two methods
	* allow for checking whether an element requires an open tag on printing
	* ({@link #isEmptyTag}) or on parsing ({@link #isOptionalClosing}).
	* <P>
	* Two other methods translate character references from name to value and
	* from value to name. A small entities resource is loaded into memory the
	* first time any of these methods is called for fast and efficient access.
	*
	* @author <a href="mailto:arkin@intalio.com">Assaf Arkin</a>
	*
	* @deprecated As of JDK 9, Xerces 2.9.0, Xerces DOM L3 Serializer implementation
	* is replaced by that of Xalan. Main class
	* {@link com.sun.org.apache.xml.internal.serialize.DOMSerializerImpl} is replaced
	* by {@link com.sun.org.apache.xml.internal.serializer.dom3.LSSerializerImpl}.
	*/
	@Deprecated
	public final class HTMLdtd
	{

	/**
	* Public identifier for HTML 4.01 (Strict) document type.
	*/
	public static final String HTMLPublicId = "-//W3C//DTD HTML 4.01//EN";

	/**
	* System identifier for HTML 4.01 (Strict) document type.
	*/
	public static final String HTMLSystemId =
	"http://www.w3.org/TR/html4/strict.dtd";

	/**
	* Public identifier for XHTML 1.0 (Strict) document type.
	*/
	public static final String XHTMLPublicId =
	"-//W3C//DTD XHTML 1.0 Strict//EN";

	/**
	* System identifier for XHTML 1.0 (Strict) document type.
	*/
	public static final String XHTMLSystemId =
	"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";

	/**
	* Table of reverse character reference mapping. Character codes are held
	* as single-character strings, mapped to their reference name.
	*/
	private static Map<Integer, String> _byChar;


	/**
	* Table of entity name to value mapping. Entities are held as strings,
	* character references as <TT>Character</TT> objects.
	*/
	private static Map<String, Integer> _byName;


	private static final Map<String, String[]> _boolAttrs;


	/**
	* Holds element definitions.
	*/
	private static final Map<String, Integer> _elemDefs;


	/**
	* Locates the HTML entities file that is loaded upon initialization.
	* This file is a resource loaded with the default class loader.
	*/
	private static final String ENTITIES_RESOURCE = "HTMLEntities.res";


	/**
	* Only opening tag should be printed.
	*/
	private static final int ONLY_OPENING = 0x0001;

	/**
	* Element contains element content only.
	*/
	private static final int ELEM_CONTENT = 0x0002;


	/**
	* Element preserve spaces.
	*/
	private static final int PRESERVE = 0x0004;


	/**
	* Optional closing tag.
	*/
	private static final int OPT_CLOSING = 0x0008;


	/**
	* Element is empty (also means only opening tag)
	*/
	private static final int EMPTY = 0x0010 \| ONLY_OPENING;


	/**
	* Allowed to appear in head.
	*/
	private static final int ALLOWED_HEAD = 0x0020;


	/**
	* When opened, closes P.
	*/
	private static final int CLOSE_P = 0x0040;


	/**
	* When opened, closes DD or DT.
	*/
	private static final int CLOSE_DD_DT = 0x0080;


	/**
	* When opened, closes itself.
	*/
	private static final int CLOSE_SELF = 0x0100;


	/**
	* When opened, closes another table section.
	*/
	private static final int CLOSE_TABLE = 0x0200;


	/**
	* When opened, closes TH or TD.
	*/
	private static final int CLOSE_TH_TD = 0x04000;


	/**
	* Returns true if element is declared to be empty. HTML elements are
	* defines as empty in the DTD, not by the document syntax.
	*
	* @param tagName The element tag name (upper case)
	* @return True if element is empty
	*/
	public static boolean isEmptyTag( String tagName )
	{
	return isElement( tagName, EMPTY );
	}


	/**
	* Returns true if element is declared to have element content.
	* Whitespaces appearing inside element content will be ignored,
	* other text will simply report an error.
	*
	* @param tagName The element tag name (upper case)
	* @return True if element content
	*/
	public static boolean isElementContent( String tagName )
	{
	return isElement( tagName, ELEM_CONTENT );
	}


	/**
	* Returns true if element's textual contents preserves spaces.
	* This only applies to PRE and TEXTAREA, all other HTML elements
	* do not preserve space.
	*
	* @param tagName The element tag name (upper case)
	* @return True if element's text content preserves spaces
	*/
	public static boolean isPreserveSpace( String tagName )
	{
	return isElement( tagName, PRESERVE );
	}


	/**
	* Returns true if element's closing tag is optional and need not
	* exist. An error will not be reported for such elements if they
	* are not closed. For example, <tt>LI</tt> is most often not closed.
	*
	* @param tagName The element tag name (upper case)
	* @return True if closing tag implied
	*/
	public static boolean isOptionalClosing( String tagName )
	{
	return isElement( tagName, OPT_CLOSING );
	}


	/**
	* Returns true if element's closing tag is generally not printed.
	* For example, <tt>LI</tt> should not print the closing tag.
	*
	* @param tagName The element tag name (upper case)
	* @return True if only opening tag should be printed
	*/
	public static boolean isOnlyOpening( String tagName )
	{
	return isElement( tagName, ONLY_OPENING );
	}


	/**
	* Returns true if the opening of one element (<tt>tagName</tt>) implies
	* the closing of another open element (<tt>openTag</tt>). For example,
	* every opening <tt>LI</tt> will close the previously open <tt>LI</tt>,
	* and every opening <tt>BODY</tt> will close the previously open <tt>HEAD</tt>.
	*
	* @param tagName The newly opened element
	* @param openTag The already opened element
	* @return True if closing tag closes opening tag
	*/
	public static boolean isClosing( String tagName, String openTag )
	{
	// Several elements are defined as closing the HEAD
	if ( openTag.equalsIgnoreCase( "HEAD" ) )
	return ! isElement( tagName, ALLOWED_HEAD );
	// P closes iteself
	if ( openTag.equalsIgnoreCase( "P" ) )
	return isElement( tagName, CLOSE_P );
	// DT closes DD, DD closes DT
	if ( openTag.equalsIgnoreCase( "DT" ) \|\| openTag.equalsIgnoreCase( "DD" ) )
	return isElement( tagName, CLOSE_DD_DT );
	// LI and OPTION close themselves
	if ( openTag.equalsIgnoreCase( "LI" ) \|\| openTag.equalsIgnoreCase( "OPTION" ) )
	return isElement( tagName, CLOSE_SELF );
	// Each of these table sections closes all the others
	if ( openTag.equalsIgnoreCase( "THEAD" ) \|\| openTag.equalsIgnoreCase( "TFOOT" ) \|\|
	openTag.equalsIgnoreCase( "TBODY" ) \|\| openTag.equalsIgnoreCase( "TR" ) \|\|
	openTag.equalsIgnoreCase( "COLGROUP" ) )
	return isElement( tagName, CLOSE_TABLE );
	// TD closes TH and TH closes TD
	if ( openTag.equalsIgnoreCase( "TH" ) \|\| openTag.equalsIgnoreCase( "TD" ) )
	return isElement( tagName, CLOSE_TH_TD );
	return false;
	}


	/**
	* Returns true if the specified attribute it a URI and should be
	* escaped appropriately. In HTML URIs are escaped differently
	* than normal attributes.
	*
	* @param tagName The element's tag name
	* @param attrName The attribute's name
	*/
	public static boolean isURI( String tagName, String attrName )
	{
	// Stupid checks.
	return ( attrName.equalsIgnoreCase( "href" ) \|\| attrName.equalsIgnoreCase( "src" ) );
	}


	/**
	* Returns true if the specified attribute is a boolean and should be
	* printed without the value. This applies to attributes that are true
	* if they exist, such as selected (OPTION/INPUT).
	*
	* @param tagName The element's tag name
	* @param attrName The attribute's name
	*/
	public static boolean isBoolean( String tagName, String attrName )
	{
	String[] attrNames;

	attrNames = _boolAttrs.get( tagName.toUpperCase(Locale.ENGLISH) );
	if ( attrNames == null )
	return false;
	for ( int i = 0 ; i < attrNames.length ; ++i )
	if ( attrNames[ i ].equalsIgnoreCase( attrName ) )
	return true;
	return false;
	}


	/**
	* Returns the value of an HTML character reference by its name. If the
	* reference is not found or was not defined as a character reference,
	* returns EOF (-1).
	*
	* @param name Name of character reference
	* @return Character code or EOF (-1)
	*/
	public static int charFromName( String name )
	{
	Object value;

	initialize();
	value = _byName.get( name );
	if ( value != null && value instanceof Integer )
	return ( (Integer) value ).intValue();
	else
	return -1;
	}


	/**
	* Returns the name of an HTML character reference based on its character
	* value. Only valid for entities defined from character references. If no
	* such character value was defined, return null.
	*
	* @param value Character value of entity
	* @return Entity's name or null
	*/
	public static String fromChar(int value )
	{
	if (value > 0xffff)
	return null;

	String name;

	initialize();
	name = _byChar.get(value);
	return name;
	}


	/**
	* Initialize upon first access. Will load all the HTML character references
	* into a list that is accessible by name or character value and is optimized
	* for character substitution. This method may be called any number of times
	* but will execute only once.
	*/
	private static void initialize()
	{
	InputStream is = null;
	BufferedReader reader = null;
	int index;
	String name;
	String value;
	int code;
	String line;

	// Make sure not to initialize twice.
	if ( _byName != null )
	return;
	try {
	_byName = new HashMap<>();
	_byChar = new HashMap<>();
	is = HTMLdtd.class.getResourceAsStream( ENTITIES_RESOURCE );
	if ( is == null ) {
	throw new RuntimeException(
	DOMMessageFormatter.formatMessage(
	DOMMessageFormatter.SERIALIZER_DOMAIN,
	"ResourceNotFound", new Object[] {ENTITIES_RESOURCE}));
	}
	reader = new BufferedReader( new InputStreamReader( is, "ASCII" ) );
	line = reader.readLine();
	while ( line != null ) {
	if ( line.length() == 0 \|\| line.charAt( 0 ) == '#' ) {
	line = reader.readLine();
	continue;
	}
	index = line.indexOf( ' ' );
	if ( index > 1 ) {
	name = line.substring( 0, index );
	++index;
	if ( index < line.length() ) {
	value = line.substring( index );
	index = value.indexOf( ' ' );
	if ( index > 0 )
	value = value.substring( 0, index );
	code = Integer.parseInt( value );
	defineEntity( name, (char) code );
	}
	}
	line = reader.readLine();
	}
	is.close();
	} catch ( Exception except ) {
	throw new RuntimeException(
	DOMMessageFormatter.formatMessage(
	DOMMessageFormatter.SERIALIZER_DOMAIN,
	"ResourceNotLoaded", new Object[] {ENTITIES_RESOURCE, except.toString()}));
	} finally {
	if ( is != null ) {
	try {
	is.close();
	} catch ( Exception except ) { }
	}
	}
	}


	/**
	* Defines a new character reference. The reference's name and value are
	* supplied. Nothing happens if the character reference is already defined.
	* <P>
	* Unlike internal entities, character references are a string to single
	* character mapping. They are used to map non-ASCII characters both on
	* parsing and printing, primarily for HTML documents. '<amp;' is an
	* example of a character reference.
	*
	* @param name The entity's name
	* @param value The entity's value
	*/
	private static void defineEntity( String name, char value )
	{
	if ( _byName.get( name ) == null ) {
	_byName.put( name, new Integer( value ) );
	_byChar.put( new Integer( value ), name );
	}
	}


	private static void defineElement( String name, int flags )
	{
	_elemDefs.put(name, flags);
	}


	private static void defineBoolean( String tagName, String attrName )
	{
	defineBoolean( tagName, new String[] { attrName } );
	}


	private static void defineBoolean( String tagName, String[] attrNames )
	{
	_boolAttrs.put( tagName, attrNames );
	}


	private static boolean isElement( String name, int flag )
	{
	Integer flags;

	flags = _elemDefs.get( name.toUpperCase(Locale.ENGLISH) );
	if ( flags == null )
	return false;
	else
	return ( ( flags.intValue() & flag ) == flag );
	}


	static
	{
	_elemDefs = new HashMap<>();
	defineElement( "ADDRESS", CLOSE_P );
	defineElement( "AREA", EMPTY );
	defineElement( "BASE", EMPTY \| ALLOWED_HEAD );
	defineElement( "BASEFONT", EMPTY );
	defineElement( "BLOCKQUOTE", CLOSE_P );
	defineElement( "BODY", OPT_CLOSING );
	defineElement( "BR", EMPTY );
	defineElement( "COL", EMPTY );
	defineElement( "COLGROUP", ELEM_CONTENT \| OPT_CLOSING \| CLOSE_TABLE );
	defineElement( "DD", OPT_CLOSING \| ONLY_OPENING \| CLOSE_DD_DT );
	defineElement( "DIV", CLOSE_P );
	defineElement( "DL", ELEM_CONTENT \| CLOSE_P );
	defineElement( "DT", OPT_CLOSING \| ONLY_OPENING \| CLOSE_DD_DT );
	defineElement( "FIELDSET", CLOSE_P );
	defineElement( "FORM", CLOSE_P );
	defineElement( "FRAME", EMPTY \| OPT_CLOSING );
	defineElement( "H1", CLOSE_P );
	defineElement( "H2", CLOSE_P );
	defineElement( "H3", CLOSE_P );
	defineElement( "H4", CLOSE_P );
	defineElement( "H5", CLOSE_P );
	defineElement( "H6", CLOSE_P );
	defineElement( "HEAD", ELEM_CONTENT \| OPT_CLOSING );
	defineElement( "HR", EMPTY \| CLOSE_P );
	defineElement( "HTML", ELEM_CONTENT \| OPT_CLOSING );
	defineElement( "IMG", EMPTY );
	defineElement( "INPUT", EMPTY );
	defineElement( "ISINDEX", EMPTY \| ALLOWED_HEAD );
	defineElement( "LI", OPT_CLOSING \| ONLY_OPENING \| CLOSE_SELF );
	defineElement( "LINK", EMPTY \| ALLOWED_HEAD );
	defineElement( "MAP", ALLOWED_HEAD );
	defineElement( "META", EMPTY \| ALLOWED_HEAD );
	defineElement( "OL", ELEM_CONTENT \| CLOSE_P );
	defineElement( "OPTGROUP", ELEM_CONTENT );
	defineElement( "OPTION", OPT_CLOSING \| ONLY_OPENING \| CLOSE_SELF );
	defineElement( "P", OPT_CLOSING \| CLOSE_P \| CLOSE_SELF );
	defineElement( "PARAM", EMPTY );
	defineElement( "PRE", PRESERVE \| CLOSE_P );
	defineElement( "SCRIPT", ALLOWED_HEAD \| PRESERVE );
	defineElement( "NOSCRIPT", ALLOWED_HEAD \| PRESERVE );
	defineElement( "SELECT", ELEM_CONTENT );
	defineElement( "STYLE", ALLOWED_HEAD \| PRESERVE );
	defineElement( "TABLE", ELEM_CONTENT \| CLOSE_P );
	defineElement( "TBODY", ELEM_CONTENT \| OPT_CLOSING \| CLOSE_TABLE );
	defineElement( "TD", OPT_CLOSING \| CLOSE_TH_TD );
	defineElement( "TEXTAREA", PRESERVE );
	defineElement( "TFOOT", ELEM_CONTENT \| OPT_CLOSING \| CLOSE_TABLE );
	defineElement( "TH", OPT_CLOSING \| CLOSE_TH_TD );
	defineElement( "THEAD", ELEM_CONTENT \| OPT_CLOSING \| CLOSE_TABLE );
	defineElement( "TITLE", ALLOWED_HEAD );
	defineElement( "TR", ELEM_CONTENT \| OPT_CLOSING \| CLOSE_TABLE );
	defineElement( "UL", ELEM_CONTENT \| CLOSE_P );

	_boolAttrs = new HashMap<>();
	defineBoolean( "AREA", "href" );
	defineBoolean( "BUTTON", "disabled" );
	defineBoolean( "DIR", "compact" );
	defineBoolean( "DL", "compact" );
	defineBoolean( "FRAME", "noresize" );
	defineBoolean( "HR", "noshade" );
	defineBoolean( "IMAGE", "ismap" );
	defineBoolean( "INPUT", new String[] { "defaultchecked", "checked", "readonly", "disabled" } );
	defineBoolean( "LINK", "link" );
	defineBoolean( "MENU", "compact" );
	defineBoolean( "OBJECT", "declare" );
	defineBoolean( "OL", "compact" );
	defineBoolean( "OPTGROUP", "disabled" );
	defineBoolean( "OPTION", new String[] { "default-selected", "selected", "disabled" } );
	defineBoolean( "SCRIPT", "defer" );
	defineBoolean( "SELECT", new String[] { "multiple", "disabled" } );
	defineBoolean( "STYLE", "disabled" );
	defineBoolean( "TD", "nowrap" );
	defineBoolean( "TH", "nowrap" );
	defineBoolean( "TEXTAREA", new String[] { "disabled", "readonly" } );
	defineBoolean( "UL", "compact" );

	initialize();
	}



	}

Back to index...