ContinueParser.java

/**
 * Copyright (C) 2013-2016 The Rythm Engine project
 * for LICENSE and other details see:
 * https://github.com/rythmengine/rythmengine
 */
package org.rythmengine.internal.parser.build_in;

import com.stevesoft.pat.Regex;
import org.rythmengine.internal.IContext;
import org.rythmengine.internal.IParser;
import org.rythmengine.internal.Keyword;
import org.rythmengine.internal.Token;
import org.rythmengine.internal.parser.CodeToken;
import org.rythmengine.internal.parser.RemoveLeadingLineBreakAndSpacesParser;
import org.rythmengine.utils.S;

public class ContinueParser extends KeywordParserFactory {

    private static final String R = "^(\\n?[ \\t\\x0B\\f]*%s%s\\s*((?@()))?[\\s;]*)";

    public ContinueParser() {
    }

    protected String patternStr() {
        return R;
    }

    public IParser create(IContext c) {
        return new RemoveLeadingLineBreakAndSpacesParser(c) {
            public Token go() {
                Regex r = reg(dialect());
                if (r.search(remain())) {
                    step(r.stringMatched().length());
                    String condition = r.stringMatched(3);
                    if (null != condition) {
                        condition = S.stripBrace(condition);
                    }
                    IContext.Continue c = ctx().peekContinue();
                    if (null == c) raiseParseException("Bad @continue statement: No loop context");
                    if (S.notEmpty(condition)) {
                        return new IfThenToken(condition, "continue", ctx());
                    } else {
                        return new CodeToken(c.getStatement(), ctx());
                    }
                }
                raiseParseException("Bad @continue statement. Correct usage: @continue()");
                return null;
            }
        };
    }

    @Override
    public Keyword keyword() {
        return Keyword.CONTINUE;
    }

}