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A collection of tests for ANTLR 4 Runtime libraries.

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/*
 * [The "BSD license"]
 *  Copyright (c) 2012 Terence Parr
 *  Copyright (c) 2012 Sam Harwell
 *  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.
 */

var Utils = require('./../Utils');
var Token = require('./../Token').Token;
var RuleNode = require('./Tree').RuleNode;
var ErrorNode = require('./Tree').ErrorNode;
var TerminalNode = require('./Tree').TerminalNode;
var ParserRuleContext = require('./../ParserRuleContext').ParserRuleContext;
var RuleContext = require('./../RuleContext').RuleContext;
var INVALID_ALT_NUMBER = require('./../atn/ATN').INVALID_ALT_NUMBER;


/** A set of utility routines useful for all kinds of ANTLR trees. */
function Trees() {
}

// Print out a whole tree in LISP form. {@link //getNodeText} is used on the
//  node payloads to get the text for the nodes.  Detect
//  parse trees and extract data appropriately.
Trees.toStringTree = function(tree, ruleNames, recog) {
	ruleNames = ruleNames || null;
	recog = recog || null;
    if(recog!==null) {
       ruleNames = recog.ruleNames;
    }
    var s = Trees.getNodeText(tree, ruleNames);
    s = Utils.escapeWhitespace(s, false);
    var c = tree.getChildCount();
    if(c===0) {
        return s;
    }
    var res = "(" + s + ' ';
    if(c>0) {
        s = Trees.toStringTree(tree.getChild(0), ruleNames);
        res = res.concat(s);
    }
    for(var i=1;i