FlowctlGrammar.java

package es.litesolutions.sonar.objectscript.ast.grammars;

import es.litesolutions.sonar.objectscript.ast.tokens.flowctl.FlowCtl;
import es.litesolutions.sonar.objectscript.ast.tokens.identifiers.Identifiers;
import es.litesolutions.sonar.objectscript.ast.tokens.operators.Symbols;
import org.sonar.sslr.grammar.GrammarRuleKey;
import org.sonar.sslr.grammar.LexerfulGrammarBuilder;

public enum FlowctlGrammar
    implements GrammarRuleKey
{

    /*
     * IF/ELSEIF/ELSE
     */
    IF_STATEMENT,
    ELSEIF,
    ELSE,

    /*
     * WHILE
     */
    WHILE_STATEMENT,

    /*
     * TRY/CATCH
     */
    TRYCATCH_STATEMENT,
    TRYBLOCK,
    CATCHARG,
    CATCHBLOCK,

    /*
     * Flow control in general
     */
    FLOWCTL,
    ;

    public static void injectInto(final LexerfulGrammarBuilder builder)
    {

        builder.rule(ELSE).is(
            FlowCtl.ELSE,
            ObjectScriptGrammar.CODE_BLOCK
        ).skip();

        builder.rule(ELSEIF).is(
            FlowCtl.ELSEIF,
            ObjectScriptGrammar.BOOLEAN_EXPRESSION,
            ObjectScriptGrammar.CODE_BLOCK
        ).skip();

        builder.rule(IF_STATEMENT).is(FlowCtl.IF,
            ObjectScriptGrammar.BOOLEAN_EXPRESSION,
            ObjectScriptGrammar.CODE_BLOCK, builder.zeroOrMore(ELSEIF),
            builder.optional(ELSE));

        builder.rule(WHILE_STATEMENT).is(
            FlowCtl.WHILE,
            ObjectScriptGrammar.BOOLEAN_EXPRESSION,
            ObjectScriptGrammar.CODE_BLOCK
        );

        builder.rule(TRYBLOCK).is(FlowCtl.TRY, ObjectScriptGrammar.CODE_BLOCK);

        builder.rule(CATCHARG).is(
            builder.firstOf(
                builder.sequence(
                    Symbols.LPAREN,
                    Identifiers.LOCAL,
                    Symbols.RPAREN
                ),
                Identifiers.LOCAL
            )
        );

        builder.rule(CATCHBLOCK).is(
            FlowCtl.CATCH,
            CATCHARG,
            ObjectScriptGrammar.CODE_BLOCK
        );

        builder.rule(TRYCATCH_STATEMENT).is(TRYBLOCK, CATCHBLOCK);

        builder.rule(FLOWCTL).is(
            builder.firstOf(
                IF_STATEMENT,
                WHILE_STATEMENT,
                TRYCATCH_STATEMENT
            )
        );
    }
}