js.antlr4.tree.Trees.js Maven / Gradle / Ivy

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/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

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