/*
 * [The "BSD license"]
 * Copyright (c) 2013 Terence Parr
 * Copyright (c) 2013 Sam Harwell
 * Copyright (c) 2017 Egbert Voigt
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

module antlr.v4.runtime.tree.pattern.RuleTagToken;

import std.conv;
import antlr.v4.runtime.CharStream;
import antlr.v4.runtime.IllegalArgumentException;
import antlr.v4.runtime.Token;
import antlr.v4.runtime.TokenConstantDefinition;
import antlr.v4.runtime.TokenSource;

// Class RuleTagToken
/**
 * @uml
 * A {@link Token} object representing an entire subtree matched by a parser
 * rule; e.g., {@code <expr>}. These tokens are created for {@link TagChunk}
 * chunks where the tag corresponds to a parser rule.
 */
class RuleTagToken : Token
{

    /**
     * @uml
     * This is the backing field for {@link #getRuleName}.
     */
    private string ruleName;

    /**
     * @uml
     * The token type for the current token. This is the token type assigned to
     * the bypass alternative for the rule during ATN deserialization.
     */
    private int bypassTokenType;

    /**
     * @uml
     * This is the backing field for {@link #getLabel}.
     */
    private string label;

    /**
     * @uml
     * Constructs a new instance of {@link RuleTagToken} with the specified rule
     * name and bypass token type and no label.
     *
     *  @param ruleName The name of the parser rule this rule tag matches.
     *  @param bypassTokenType The bypass token type assigned to the parser rule.
     *
     *  @exception IllegalArgumentException if {@code ruleName} is {@code null}
     * or empty.
     */
    public this(string ruleName, int bypassTokenType)
    {
        this(ruleName, bypassTokenType, null);
    }

    /**
     * @uml
     * Constructs a new instance of {@link RuleTagToken} with the specified rule
     *  name, bypass token type, and label.
     *
     *  @param ruleName The name of the parser rule this rule tag matches.
     *  @param bypassTokenType The bypass token type assigned to the parser rule.
     *  @param label The label associated with the rule tag, or {@code null} if
     * the rule tag is unlabeled.
     *
     *  @exception IllegalArgumentException if {@code ruleName} is {@code null}
     *  or empty.
     */
    public this(string ruleName, int bypassTokenType, string label)
    {
	if (ruleName is null || ruleName.length == 0) {
            throw new IllegalArgumentException("ruleName cannot be null or empty.");
        }
        this.ruleName = ruleName;
        this.bypassTokenType = bypassTokenType;
        this.label = label;
    }

    /**
     * @uml
     * Gets the name of the rule associated with this rule tag.
     *
     *  @return The name of the parser rule associated with this rule tag.
     */
    public string getRuleName()
    {
        return ruleName;
    }

    /**
     * @uml
     * Gets the label associated with the rule tag.
     *
     *  @return The name of the label associated with the rule tag, or
     * {@code null} if this is an unlabeled rule tag.
     */
    public string getLabel()
    {
        return label;
    }

    /**
     * @uml
     * @override
     * <p>Rule tag tokens are always placed on the {@link #DEFAULT_CHANNEL}.</p>
     */
    public override int getChannel()
    {
        return TokenConstantDefinition.DEFAULT_CHANNEL;
    }

    /**
     * @uml
     * @override
     * <p>This method returns the rule tag formatted with {@code <} and {@code >}
     * delimiters.</p>
     */
    public override string getText()
    {
        if (label !is null) {
            return "<" ~ label ~ ":" ~ ruleName ~ ">";
        }
        return "<" ~ ruleName ~ ">";
    }

    /**
     * @uml
     * @override
     * <p>Rule tag tokens have types assigned according to the rule bypass
     * transitions created during ATN deserialization.</p>
     */
    public override int getType()
    {
        return bypassTokenType;
    }

    /**
     * @uml
     * @override
     */
    public override int getLine()
    {
        return 0;
    }

    /**
     * @uml
     * @override
     */
    public override int getCharPositionInLine()
    {
        return -1;
    }

    /**
     * @uml
     * @override
     */
    public override int getTokenIndex()
    {
        return -1;
    }

    /**
     * @uml
     * @override
     */
    public override int getStartIndex()
    {
        return -1;
    }

    /**
     * @uml
     * @override
     */
    public override int getStopIndex()
    {
        return -1;
    }

    /**
     * @uml
     * @override
     */
    public override TokenSource getTokenSource()
    {
        return null;
    }

    /**
     * @uml
     * @override
     */
    public override CharStream getInputStream()
    {
        return null;
    }

    /**
     * @uml
     * @override
     */
    public override string toString()
    {
        return ruleName ~ ":" ~ to!string(bypassTokenType);
    }

}