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/*
 * Copyright (c) 2018, 2022, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
 *
 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 *
 * without restriction, including without limitation the rights to copy, create
 * derivative works of, display, perform, and distribute the Software and make,
 * use, sell, offer for sale, import, export, have made, and have sold the
 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
 *
 * This license is subject to the following condition:
 *
 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must be included in all copies or substantial
 * portions of the Software.
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 */
package com.oracle.truffle.regex.runtime.nodes;

import com.oracle.truffle.api.CompilerAsserts;
import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.GenerateInline;
import com.oracle.truffle.api.dsl.GenerateUncached;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.interop.UnsupportedMessageException;
import com.oracle.truffle.api.library.CachedLibrary;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.strings.TruffleString;

@GenerateUncached
@GenerateInline(false)
public abstract class ExpectStringNode extends Node {

    public abstract TruffleString execute(Object arg, TruffleString.Encoding encoding);

    @Specialization
    static TruffleString doString(String input, TruffleString.Encoding encoding,
                    @Cached TruffleString.FromJavaStringNode fromJavaStringNode) {
        CompilerAsserts.partialEvaluationConstant(encoding);
        return fromJavaStringNode.execute(input, encoding);
    }

    @Specialization
    static TruffleString doTString(TruffleString input, @SuppressWarnings("unused") TruffleString.Encoding encoding) {
        return input;
    }

    @Specialization(guards = "inputs.isString(input)", limit = "2")
    static TruffleString doBoxedString(Object input, @SuppressWarnings("unused") TruffleString.Encoding encoding,
                    @CachedLibrary("input") InteropLibrary inputs) {
        try {
            return inputs.asTruffleString(input);
        } catch (UnsupportedMessageException e) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            throw CompilerDirectives.shouldNotReachHere("unexpected string type passed to TRegex: " + input.getClass());
        }
    }

    public static ExpectStringNode create() {
        return ExpectStringNodeGen.create();
    }
}