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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.

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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.javascript.ast;

import org.mozilla.javascript.Token;

/**
 * AST node representing an E4X {@code foo.(bar)} query expression. The node type (operator) is
 * {@link Token#DOTQUERY}. Its {@code getLeft} node is the target ("foo" in the example), and the
 * {@code getRight} node is the filter expression node.
 *
 * This class exists separately from {@link InfixExpression} largely because it has different
 * printing needs. The position of the left paren is just after the dot (operator) position, and the
 * right paren is the final position in the bounds of the node. If the right paren is missing, the
 * node ends at the end of the filter expression.
 */
public class XmlDotQuery extends InfixExpression {

    private int rp = -1;

    {
        type = Token.DOTQUERY;
    }

    public XmlDotQuery() {}

    public XmlDotQuery(int pos) {
        super(pos);
    }

    public XmlDotQuery(int pos, int len) {
        super(pos, len);
    }

    /**
     * Returns right-paren position, -1 if missing.
     *
     * Note that the left-paren is automatically the character immediately after the "." in the
     * operator - no whitespace is permitted between the dot and lp by the scanner.
     */
    public int getRp() {
        return rp;
    }

    /** Sets right-paren position */
    public void setRp(int rp) {
        this.rp = rp;
    }

    @Override
    public String toSource(int depth) {
        StringBuilder sb = new StringBuilder();
        sb.append(makeIndent(depth));
        sb.append(getLeft().toSource(0));
        sb.append(".(");
        sb.append(getRight().toSource(0));
        sb.append(")");
        return sb.toString();
    }
}