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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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
 * 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
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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
 *
 * (a) the Software, and
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 * (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
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 * 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.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.instrumentation.Tag;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.js.nodes.JavaScriptBaseNode;
import com.oracle.truffle.js.nodes.JavaScriptNode;
import com.oracle.truffle.js.nodes.cast.JSToNumberNodeGen.JSToNumberUnaryNodeGen;
import com.oracle.truffle.js.nodes.unary.JSUnaryNode;
import com.oracle.truffle.js.runtime.BigInt;
import com.oracle.truffle.js.runtime.Errors;
import com.oracle.truffle.js.runtime.JSRuntime;
import com.oracle.truffle.js.runtime.Symbol;

import java.util.Set;

This implements ECMA 9.3 ToNumber.
/**
 * This implements ECMA 9.3 ToNumber.
 *
 */
public abstract class JSToNumberNode extends JavaScriptBaseNode {

    @Child private JSToNumberNode toNumberNode;
    @Child private JSStringToNumberNode stringToNumberNode;

    public abstract Object execute(Object value);

    public final Number executeNumber(Object value) {
        return (Number) execute(value);
    }

    public static JSToNumberNode create() {
        return JSToNumberNodeGen.create();
    }

    public static JavaScriptNode create(JavaScriptNode child) {
        if (child.isResultAlwaysOfType(Number.class) || child.isResultAlwaysOfType(int.class) || child.isResultAlwaysOfType(double.class)) {
            return child;
        }
        return JSToNumberUnaryNodeGen.create(child);
    }

    @Specialization
    protected static int doInteger(int value) {
        return value;
    }

    @Specialization
    protected static int doBoolean(boolean value) {
        return JSRuntime.booleanToNumber(value);
    }

    @Specialization
    protected static double doDouble(double value) {
        return value;
    }

    @Specialization(guards = "isJSNull(value)")
    protected static int doNull(@SuppressWarnings("unused") Object value) {
        return 0;
    }

    @Specialization(guards = "isUndefined(value)")
    protected static double doUndefined(@SuppressWarnings("unused") Object value) {
        return Double.NaN;
    }

    @Specialization
    protected Number doString(String value) {
        double doubleValue = stringToNumber(value);
        return JSRuntime.doubleToNarrowestNumber(doubleValue);
    }

    @Specialization(guards = "isJSObject(value)")
    protected Number doJSObject(DynamicObject value,
                    @Cached("createHintNumber()") JSToPrimitiveNode toPrimitiveNode) {
        return toNumber(toPrimitiveNode.execute(value));
    }

    @Specialization
    protected final Number doSymbol(@SuppressWarnings("unused") Symbol value) {
        throw Errors.createTypeErrorCannotConvertToNumber("a Symbol value", this);
    }

    @Specialization
    protected final Number doBigInt(@SuppressWarnings("unused") BigInt value) {
        throw Errors.createTypeErrorCannotConvertToNumber("a BigInt value", this);
    }

    @Specialization(guards = "isForeignObject(value)")
    protected Number doForeignObject(Object value,
                    @Cached("createHintNumber()") JSToPrimitiveNode toPrimitiveNode) {
        return toNumber(toPrimitiveNode.execute(value));
    }

    @Specialization(guards = "isJavaNumber(value)")
    protected static double doJavaObject(Object value) {
        return JSRuntime.doubleValue((Number) value);
    }

    private Number toNumber(Object value) {
        if (toNumberNode == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            toNumberNode = insert(JSToNumberNode.create());
        }
        return toNumberNode.executeNumber(value);
    }

    private double stringToNumber(String value) {
        if (stringToNumberNode == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            stringToNumberNode = insert(JSStringToNumberNode.create());
        }
        return stringToNumberNode.executeString(value);
    }

    public abstract static class JSToNumberUnaryNode extends JSUnaryNode {

        @Child private JSToNumberNode toNumberNode;

        protected JSToNumberUnaryNode(JavaScriptNode operand) {
            super(operand);
        }

        @Specialization
        protected Object doDefault(Object value) {
            if (toNumberNode == null) {
                CompilerDirectives.transferToInterpreterAndInvalidate();
                toNumberNode = insert(JSToNumberNode.create());
            }
            return toNumberNode.executeNumber(value);
        }

        @Override
        protected JavaScriptNode copyUninitialized(Set<Class<? extends Tag>> materializedTags) {
            return create(cloneUninitialized(getOperand(), materializedTags));
        }

        @Override
        public boolean isResultAlwaysOfType(Class<?> clazz) {
            return super.isResultAlwaysOfType(Number.class);
        }

        @Override
        public String expressionToString() {
            return getOperand().expressionToString();
        }
    }
}