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/*
 * Copyright (c) 2018, 2020, 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
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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package com.oracle.truffle.js.nodes.cast;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.js.nodes.CompileRegexNode;
import com.oracle.truffle.js.nodes.JavaScriptBaseNode;
import com.oracle.truffle.js.nodes.intl.CreateRegExpNode;
import com.oracle.truffle.js.runtime.JSContext;

/**
 * Implements a cast from an value to a RegExp Object, as defined by String.prototype.match and
 * String.prototype.search.
 */
public abstract class JSToRegExpNode extends JavaScriptBaseNode {
    protected final JSContext context;
    @Child private CreateRegExpNode createRegExpNode;

    protected JSToRegExpNode(JSContext context) {
        this.context = context;
    }

    public abstract DynamicObject execute(Object target);

    public static JSToRegExpNode create(JSContext context) {
        return JSToRegExpNodeGen.create(context);
    }

    @Specialization(guards = "isJSRegExp(regExp)")
    protected DynamicObject returnRegExp(DynamicObject regExp) {
        return regExp;
    }

    @Specialization(guards = "!isJSRegExp(patternObj)")
    protected DynamicObject createRegExp(Object patternObj,
                    @Cached("createUndefinedToEmpty()") JSToStringNode toStringNode,
                    @Cached("create(context)") CompileRegexNode compileRegexNode) {
        String pattern = toStringNode.executeString(patternObj);
        Object regex = compileRegexNode.compile(pattern);
        return getCreateRegExpNode().createRegExp(regex);
    }

    private CreateRegExpNode getCreateRegExpNode() {
        if (createRegExpNode == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            createRegExpNode = insert(CreateRegExpNode.create(context));
        }
        return createRegExpNode;
    }
}