Arguments.java

package org.fandev.lang.fan.parsing.statements.expressions.arguments;

import com.intellij.lang.PsiBuilder;
import com.intellij.psi.tree.TokenSet;
import org.fandev.lang.fan.FanBundle;
import org.fandev.lang.fan.FanElementTypes;
import static org.fandev.lang.fan.FanElementTypes.ARGUMENT_EXPR;
import static org.fandev.lang.fan.FanTokenTypes.*;
import org.fandev.lang.fan.parsing.expression.Expression;
import org.fandev.lang.fan.parsing.util.ParserUtils;
import static org.fandev.lang.fan.parsing.util.ParserUtils.advanceNoNls;
import static org.fandev.lang.fan.parsing.util.ParserUtils.getToken;
import static org.fandev.lang.fan.parsing.util.ParserUtils.removeNls;

/**
 * @author Dror Bereznitsky
 * @date Jan 14, 2009 1:29:26 PM
 */
public class Arguments {
    public static final TokenSet ARGUMENTS_STOPPER = TokenSet.create(RPAR, COMMA);

    // <args> :=  [<expr> ("," <expr>)*]
    public static boolean parse(final PsiBuilder builder) {
        final PsiBuilder.Marker marker = builder.mark();
        if (LPAR == builder.getTokenType()) {
            advanceNoNls(builder);
            while (!builder.eof() && RPAR != builder.getTokenType()) {
                final boolean res = Expression.parseExpr(builder, ARGUMENTS_STOPPER, ARGUMENT_EXPR);
                removeNls(builder);
                if (!res || RPAR == builder.getTokenType()) {
                    break;
                }
                getToken(builder, COMMA, FanBundle.message("comma.expected"));
                removeNls(builder);
            }
            getToken(builder, RPAR, FanBundle.message("rpar.expected"));
            marker.done(FanElementTypes.ARGUMENT_LIST);
            return true;
        }
        marker.drop();
        return false;
    }
}