StyleAttributeHandler.java

package net.nightwhistler.htmlspanner.handlers.attributes;

import android.text.SpannableStringBuilder;
import android.util.Log;
import net.nightwhistler.htmlspanner.SpanStack;
import net.nightwhistler.htmlspanner.css.CSSCompiler;
import net.nightwhistler.htmlspanner.style.Style;
import net.nightwhistler.htmlspanner.handlers.StyledTextHandler;
import org.htmlcleaner.TagNode;

/**
 * Handler which parses style attributes and modifies the style accordingly.
 */
public class StyleAttributeHandler extends WrappingStyleHandler  {

    public StyleAttributeHandler(StyledTextHandler wrapHandler) {
        super(wrapHandler);
    }


    @Override
    public void handleTagNode(TagNode node, SpannableStringBuilder builder, int start, int end, Style useStyle,
                              SpanStack spanStack) {

        String styleAttr = node.getAttributeByName("style");

        if ( getSpanner().isAllowStyling() && styleAttr != null ) {
            super.handleTagNode(node, builder, start, end,
                    parseStyleFromAttribute(useStyle, styleAttr),
                    spanStack);
        } else {
            super.handleTagNode(node, builder, start, end, useStyle, spanStack);
        }

    }

    private Style parseStyleFromAttribute(Style baseStyle, String attribute) {
        Style style = baseStyle;

        String[] pairs = attribute.split(";");
        for ( String pair: pairs ) {

            String[] keyVal = pair.split(":");

            if ( keyVal.length != 2) {
                Log.e("StyleAttributeHandler", "Could not parse attribute: " + attribute );
                return baseStyle;
            }

            String key =  keyVal[0].toLowerCase().trim();
            String value = keyVal[1].toLowerCase().trim();

            CSSCompiler.StyleUpdater updater = CSSCompiler.getStyleUpdater(key, value);

            if ( updater != null ) {
                style = updater.updateStyle(style, getSpanner());
            }

        }

        return style;
    }





}