BlockMacro.java

package net.asfun.jangod.lib.macro;

import net.asfun.jangod.lib.Macro;
import net.asfun.jangod.parse.ParseException;
import net.asfun.jangod.tree.Node;
import net.asfun.jangod.tree.TreeRebuilder;
import net.asfun.jangod.util.HelperStringTokenizer;

public class BlockMacro implements Macro {

    final String MACRONAME = "block";
    final String ENDMACRONAME = "endblock";
    final String BLK_NAME_PREFIX = "'BLK\"NAME:";

    @Override
    public String getEndMacroName() {
	return ENDMACRONAME;
    }

    @Override
    public void refactor(Node current, String helpers, TreeRebuilder rebuilder)
	    throws ParseException {
	String[] helper = new HelperStringTokenizer(helpers).allTokens();
	if (helper.length != 1) {
	    throw new ParseException("Macro 'block' expects 1 helper >>> "
		    + helper.length);
	}
	String blockName = rebuilder.resolveString(helper[0]);
	// if is parent
	if (rebuilder.parent == null) {
	    rebuilder.assignNode(BLK_NAME_PREFIX + blockName, current);
	} else {
	    Node parentBlock = rebuilder.fetchNode(BLK_NAME_PREFIX + blockName);
	    if (parentBlock == null) {
		throw new ParseException(
			"Dosen't define block in extends parent with name >>> "
				+ blockName);
	    }
	    // current.replaceWithChildren(parentBlock);
	    rebuilder.nodeReplace(parentBlock, current.children());
	}
    }

    @Override
    public String getName() {
	return MACRONAME;
    }

}