src/codegen/property-sets.xsl

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  Copyright 1999-2004 The Apache Software Foundation

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
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  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
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<!-- $Id$ -->
<xsl:stylesheet version="1.0"
                xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text" />

<xsl:include href="propinc.xsl"/>

<xsl:template match="root">
  <xsl:text>
package org.apache.fop.fo;

import org.apache.fop.fo.Constants;
import java.util.BitSet;
import java.util.ArrayList;

public class PropertySets {
    private static short[][] mapping = null;

    private Element[] elements = new Element[Constants.ELEMENT_COUNT+1];
    private BitSet block_elems = new BitSet();
    private BitSet inline_elems = new BitSet();

</xsl:text>
  <xsl:apply-templates select="common" mode="decl"/>
<xsl:text>
    public void initializeElements() {
        block_elems.set(Constants.FO_BLOCK);
        block_elems.set(Constants.FO_BLOCK_CONTAINER);
        block_elems.set(Constants.FO_TABLE_AND_CAPTION);
        block_elems.set(Constants.FO_TABLE);
        block_elems.set(Constants.FO_LIST_BLOCK);

        inline_elems.set(Constants.FO_BIDI_OVERRIDE);
        inline_elems.set(Constants.FO_CHARACTER);
        inline_elems.set(Constants.FO_EXTERNAL_GRAPHIC);
        inline_elems.set(Constants.FO_INSTREAM_FOREIGN_OBJECT);
        inline_elems.set(Constants.FO_INLINE);
        inline_elems.set(Constants.FO_INLINE_CONTAINER);
        inline_elems.set(Constants.FO_LEADER);
        inline_elems.set(Constants.FO_PAGE_NUMBER);
        inline_elems.set(Constants.FO_PAGE_NUMBER_CITATION);
        inline_elems.set(Constants.FO_BASIC_LINK);
        inline_elems.set(Constants.FO_MULTI_TOGGLE);
    }

    public void initializeCommon() {
</xsl:text>
<xsl:apply-templates select="common"/>
<xsl:text>
    }

    public void initialize() {
        // define the fo: elements
        for (int i = 1; i &lt; elements.length; i++) {
            elements[i] = new Element(i);
        }

        // populate the elements with properties and content elements.
        Element elem;
</xsl:text>

<xsl:apply-templates select="//element"/>
<xsl:text>

        // Merge the attributes from the children into the parent.
        for (boolean dirty = true; dirty; ) {
            dirty = false;
            for (int i = 1; i &lt; elements.length; i++) {
                dirty = dirty || elements[i].merge();
            }
        }
        // Calculate the sparse indices for each element.
        for (int i = 1; i &lt; elements.length; i++) {
            mapping[i] = makeSparseIndices(elements[i].valid);
        }
    }

    /**
     * Turn a BitSet into an array of shorts with the first element
     * on the array the number of set bits in the BitSet.
     */
    private static short[] makeSparseIndices(BitSet set) {
        short[] indices = new short[Constants.PROPERTY_COUNT+1];
        int j = 1;
        for (int i = 0; i &lt; Constants.PROPERTY_COUNT+1; i++) {
            if (set.get(i)) {
                indices[i] = (short) j++;
            }
        }
        indices[0] = (short)j;
        return indices;
    }


    public static short[] getPropertySet(int elementId) {
        if (mapping == null) {
            mapping = new short[Constants.ELEMENT_COUNT+1][];
            PropertySets ps = new PropertySets();
            ps.initializeElements();
            ps.initializeCommon();
            ps.initialize();
        }
        return mapping[elementId];
    }

    /**
     * An object that represent the properties and contents of a fo element
     */
    class Element {
        BitSet relevant = new BitSet();
        BitSet valid = new BitSet();
        int elementId;
        ArrayList children;

        Element(int elementId) {
            this.elementId = elementId;
        }

        /**
         * Add a single property to the element.
         */
        public void addProperty(int propId) {
            relevant.set(propId);
            valid.set(propId);
        }

        /**
         * Add a set of properties to the element.
         */
        public void addProperties(BitSet properties) {
            relevant.or(properties);
            valid.or(properties);
        }

        /**
         * Add a single fo element as a content child.
         */
        public void addContent(int elementId) {
            if (children == null) {
                children = new ArrayList();
            }
            children.add(elements[elementId]);
        }

        /**
         * Add a set of fo elements as content children.
         */
        public void addContent(BitSet elements) {
            for (int i = 0; i &lt; elements.size(); i++) {
                if (elements.get(i)) {
                    addContent(i);
                }
            }
        }

        /**
         * Merge the properties from the children into the set of valid
         * properties. Return true if at least one property could be added.
         */
        public boolean merge() {
            if (children == null) {
                return false;
            }
            boolean dirty = false;
            for (int i = 0; i &lt; children.size(); i++) {
                Element child = (Element) children.get(i);
                BitSet childValid = child.valid;
                int n = childValid.length();
                for (int j = 0; j &lt; n; j++) {
                    if (childValid.get(j) &amp;&amp; !valid.get(j)) {
                        dirty = true;
                        valid.set(j);
                    }
                }
            }
            return dirty;
        }
    }
}
</xsl:text>
</xsl:template>

<xsl:template match="common" mode="decl">
  <xsl:variable name="name" select="name"/>
  <xsl:text>    BitSet </xsl:text><xsl:value-of select="$name"/>
  <xsl:text> = new BitSet();
</xsl:text>
</xsl:template>

<xsl:template match="common">
  <xsl:variable name="name" select="name"/>
  <xsl:apply-templates select="property">
    <xsl:with-param name="setname" select="$name"/>
  </xsl:apply-templates>
  <xsl:text>
</xsl:text>
</xsl:template>

<xsl:template match="common/property">
  <xsl:param name="setname"/>

  <xsl:text>        </xsl:text>
  <xsl:value-of select="../name"/><xsl:text>.set(Constants.PR_</xsl:text>
  <xsl:call-template name="makeEnumConstant">
    <xsl:with-param name="propstr" select="." />
  </xsl:call-template>);
</xsl:template>


<xsl:template match="element">
  <xsl:variable name="name">
    <xsl:call-template name="makeEnumConstant">
      <xsl:with-param name="propstr" select="name" />
    </xsl:call-template>
  </xsl:variable>
  <xsl:text>        elem = elements[Constants.FO_</xsl:text>
  <xsl:value-of select="$name"/>
  <xsl:text>];
</xsl:text>
  <xsl:apply-templates select="common-ref | property"/>
  <xsl:apply-templates select="content"/>
  <xsl:text>
</xsl:text>
</xsl:template>


<xsl:template match="element/common-ref">
  <xsl:param name="setname"/>

  <xsl:text>        elem.addProperties(</xsl:text>
  <xsl:value-of select="."/>);
</xsl:template>

<xsl:template match="element/property">
  <xsl:param name="setname"/>

  <xsl:text>        elem.addProperty(Constants.PR_</xsl:text>
  <xsl:call-template name="makeEnumConstant">
    <xsl:with-param name="propstr" select="." />
  </xsl:call-template>);
</xsl:template>

<xsl:template match="element/content">
  <xsl:variable name="name">
    <xsl:text>Constants.FO_</xsl:text>
    <xsl:call-template name="makeEnumConstant">
      <xsl:with-param name="propstr" select="." />
    </xsl:call-template>
  </xsl:variable>

  <xsl:choose>
    <xsl:when test=". = '%block;'">
       <xsl:text>        elem.addContent(block_elems);
</xsl:text>
    </xsl:when>
    <xsl:when test=". = '%inline;'">
       <xsl:text>        elem.addContent(inline_elems);
</xsl:text>
    </xsl:when>
    <xsl:otherwise>
       <xsl:text>        elem.addContent(</xsl:text>
      <xsl:value-of select="$name"/>
      <xsl:text>);
</xsl:text>
    </xsl:otherwise>
  </xsl:choose>
</xsl:template>


<xsl:template match="text()"/>

</xsl:stylesheet>