Facet.java

package org.fandev.lang.fan.parsing.auxiliary.facets;

import com.intellij.lang.PsiBuilder;
import org.fandev.lang.fan.FanBundle;
import org.fandev.lang.fan.FanElementTypes;
import org.fandev.lang.fan.FanTokenTypes;
import static org.fandev.lang.fan.FanTokenTypes.*;
import org.fandev.lang.fan.parsing.util.ParserUtils;
import org.fandev.lang.fan.parsing.expression.Expression;

/**
 * @author Dror Bereznitsky
 * @date Jan 14, 2009 11:15:08 PM
 */
public class Facet {
    // Facets are defined as "@name=value" prefixed before a type or slot definition
    // @<id>[=<expr>]<eos>
    public static boolean parse(final PsiBuilder builder) {
        ParserUtils.removeNls(builder);
        while (AT.equals(builder.getTokenType())) {
            final PsiBuilder.Marker facetMarker = builder.mark();
            builder.advanceLexer();
            // Annotation itself
            if (!ParserUtils.parseName(builder)) {
                facetMarker.drop();
                return false;
            }
            if (FanTokenTypes.EQ.equals(builder.getTokenType())) {
                ParserUtils.advanceNoNls(builder);
                Expression.parseExpr(builder,EOS,FanElementTypes.FACET_VALUE);
            }
            facetMarker.done(FanElementTypes.FACET);
            ParserUtils.removeStoppers(builder, SEPARATOR, SEPARATOR);
        }
        return true;
    }
}