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 * The Universal Permissive License (UPL), Version 1.0
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 * person obtaining a copy of this software, associated documentation and/or
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 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
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 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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package com.oracle.truffle.regex;

import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.interop.UnknownIdentifierException;
import com.oracle.truffle.api.library.ExportLibrary;
import com.oracle.truffle.api.library.ExportMessage;
import com.oracle.truffle.regex.util.TruffleReadOnlyKeysArray;

@ExportLibrary(InteropLibrary.class)
public abstract class AbstractConstantKeysObject extends AbstractRegexObject {

    public abstract TruffleReadOnlyKeysArray getKeys();

    public abstract Object readMemberImpl(String symbol) throws UnknownIdentifierException;

    @ExportMessage
    public boolean hasMembers() {
        return true;
    }

    @ExportMessage
    public Object getMembers(@SuppressWarnings("unused") boolean includeInternal) {
        return getKeys();
    }

    @ExportMessage
    public abstract static class IsMemberReadable {

        @SuppressWarnings("unused")
        @Specialization(guards = "symbol == cachedSymbol", limit = "8")
        public static boolean cacheIdentity(AbstractConstantKeysObject receiver, String symbol,
                        @Cached("symbol") String cachedSymbol,
                        @Cached("isReadable(receiver, cachedSymbol)") boolean result) {
            return result;
        }

        @SuppressWarnings("unused")
        @Specialization(guards = "symbol.equals(cachedSymbol)", limit = "8", replaces = "cacheIdentity")
        public static boolean cacheEquals(AbstractConstantKeysObject receiver, String symbol,
                        @Cached("symbol") String cachedSymbol,
                        @Cached("isReadable(receiver, cachedSymbol)") boolean result) {
            return result;
        }

        @SuppressWarnings("unused")
        @Specialization(replaces = "cacheEquals")
        public static boolean isReadable(AbstractConstantKeysObject receiver, String symbol) {
            return receiver.getKeys().contains(symbol);
        }
    }

    @ExportMessage
    public abstract static class ReadMember {

        @Specialization(guards = "symbol == cachedSymbol", limit = "8")
        public static Object readIdentity(AbstractConstantKeysObject receiver, @SuppressWarnings("unused") String symbol,
                        @Cached("symbol") String cachedSymbol) throws UnknownIdentifierException {
            return read(receiver, cachedSymbol);
        }

        @Specialization(guards = "symbol.equals(cachedSymbol)", limit = "8", replaces = "readIdentity")
        public static Object readEquals(AbstractConstantKeysObject receiver, @SuppressWarnings("unused") String symbol,
                        @Cached("symbol") String cachedSymbol) throws UnknownIdentifierException {
            return read(receiver, cachedSymbol);
        }

        @Specialization(replaces = "readEquals")
        public static Object read(AbstractConstantKeysObject receiver, String symbol) throws UnknownIdentifierException {
            return receiver.readMemberImpl(symbol);
        }
    }
}