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package com.oracle.js.parser.ir;

import com.oracle.js.parser.TokenType;

/**
 * IR base for accessing/indexing nodes.
 *
 * @see AccessNode
 * @see IndexNode
 */
public abstract class BaseNode extends OptionalExpression implements FunctionCall {

    /** Base Node. */
    protected final Expression base;

    /** Super property access. */
    private final boolean isSuper;

    /** Optional access or call ({@code a?.b}, {@code a?.[b]}, or {@code a?.()}). */
    private final boolean optional;

    /** Is this access part of an optional chain. */
    private final boolean optionalChain;

    private boolean isFunction;

    /**
     * Constructor
     *
     * @param token token
     * @param finish finish
     * @param base base node
     * @param isSuper is this a super property access
     */
    public BaseNode(final long token, final int finish, final Expression base, final boolean isSuper, final boolean optional, final boolean optionalChain) {
        super(token, base.getStart(), finish);
        this.base = base;
        this.isSuper = isSuper;
        this.optional = optional;
        this.optionalChain = optionalChain;
        assert !(isSuper && optional) && (!optional || optionalChain);
    }

    /**
     * Copy constructor for immutable nodes
     *
     * @param baseNode node to inherit from
     * @param base base
     * @param isSuper is this a super property access
     */
    protected BaseNode(final BaseNode baseNode, final Expression base, final boolean isSuper, final boolean optional, final boolean optionalChain) {
        super(baseNode);
        this.base = base;
        this.isSuper = isSuper;
        this.optional = optional;
        this.optionalChain = optionalChain;
        this.isFunction = baseNode.isFunction;
    }

    /**
     * Get the base node for this access
     *
     * @return the base node
     */
    public Expression getBase() {
        return base;
    }

    @Override
    public boolean isFunction() {
        return isFunction;
    }

    /**
     * @return {@code true} if this is a {@code super} property access.
     */
    public boolean isSuper() {
        return isSuper;
    }

    /**
     * Return true if this node represents an index operation normally represented as
     * {@link IndexNode}.
     *
     * @return true if an index access.
     */
    public boolean isIndex() {
        return isTokenType(TokenType.LBRACKET);
    }

    /**
     * Mark this node as being the callee operand of a {@link CallNode}.
     *
     * @return a base node identical to this one in all aspects except with its function flag set.
     */
    final BaseNode setIsFunction() {
        this.isFunction = true;
        return this;
    }

    /**
     * Mark this node as being a SuperProperty access.
     */
    public abstract BaseNode setIsSuper();

    /**
     * Returns {@code true} if this is an optional property access ({@code a?.b} or {@code a?.[b]}).
     */
    @Override
    public final boolean isOptional() {
        return optional;
    }

    @Override
    public final boolean isOptionalChain() {
        return optionalChain;
    }
}