File xpath.js has 3704 lines of code (exceeds 250 allowed). Consider refactoring.

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/*
 * xpath.js
 *
 * An XPath 1.0 library for JavaScript.
 *

Function evaluate has a Cognitive Complexity of 407 (exceeds 5 allowed). Consider refactoring.

Open

PathExpr.prototype.evaluate = function(c) {
    var nodes;
    var xpc = new XPathContext();
    xpc.variableResolver = c.variableResolver;
    xpc.functionResolver = c.functionResolver;

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Function isLetter has a Cognitive Complexity of 303 (exceeds 5 allowed). Consider refactoring.

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Utilities.isLetter = function(c) {
    return c >= 0x0041 && c <= 0x005A ||
        c >= 0x0061 && c <= 0x007A ||
        c >= 0x00C0 && c <= 0x00D6 ||
        c >= 0x00D8 && c <= 0x00F6 ||

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Function tokenize has a Cognitive Complexity of 177 (exceeds 5 allowed). Consider refactoring.

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XPathParser.prototype.tokenize = function(s1) {
    var types = [];
    var values = [];
    var s = s1 + '\0';

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Function isNCNameChar has a Cognitive Complexity of 166 (exceeds 5 allowed). Consider refactoring.

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Utilities.isNCNameChar = function(c) {
    return c >= 0x0030 && c <= 0x0039 
        || c >= 0x0660 && c <= 0x0669 
        || c >= 0x06F0 && c <= 0x06F9 
        || c >= 0x0966 && c <= 0x096F 

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Function tokenize has 333 lines of code (exceeds 25 allowed). Consider refactoring.

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XPathParser.prototype.tokenize = function(s1) {
    var types = [];
    var values = [];
    var s = s1 + '\0';

Function evaluate has 277 lines of code (exceeds 25 allowed). Consider refactoring.

Open

PathExpr.prototype.evaluate = function(c) {
    var nodes;
    var xpc = new XPathContext();
    xpc.variableResolver = c.variableResolver;
    xpc.functionResolver = c.functionResolver;

Function init has 207 lines of code (exceeds 25 allowed). Consider refactoring.

Open

XPathParser.prototype.init = function() {
    this.reduceActions = [];

    this.reduceActions[3] = function(rhs) {
        return new OrOperation(rhs[0], rhs[2]);

Function isLetter has 205 lines of code (exceeds 25 allowed). Consider refactoring.

Open

Utilities.isLetter = function(c) {
    return c >= 0x0041 && c <= 0x005A ||
        c >= 0x0061 && c <= 0x007A ||
        c >= 0x00C0 && c <= 0x00D6 ||
        c >= 0x00D8 && c <= 0x00F6 ||

Function validate has a Cognitive Complexity of 43 (exceeds 5 allowed). Consider refactoring.

Open

Scraper.prototype.validate = function(def){
  var problems = [];
  // url key must exist
  if (!def.url) {
    problems.push('must have "url" key');

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Consider simplifying this complex logical expression.

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                if (last != XPathParser.AT
                        && last != XPathParser.DOUBLECOLON
                        && last != XPathParser.LEFTPARENTHESIS
                        && last != XPathParser.LEFTBRACKET
                        && last != XPathParser.AND

Consider simplifying this complex logical expression.

Open

                if (last != XPathParser.AT
                        && last != XPathParser.DOUBLECOLON
                        && last != XPathParser.LEFTPARENTHESIS
                        && last != XPathParser.LEFTBRACKET
                        && last != XPathParser.AND

Function isNCNameChar has 125 lines of code (exceeds 25 allowed). Consider refactoring.

Open

Utilities.isNCNameChar = function(c) {
    return c >= 0x0030 && c <= 0x0039 
        || c >= 0x0660 && c <= 0x0669 
        || c >= 0x06F0 && c <= 0x06F9 
        || c >= 0x0966 && c <= 0x096F 

Function matches has a Cognitive Complexity of 27 (exceeds 5 allowed). Consider refactoring.

Open

NodeTest.prototype.matches = function(n, xpc) {
    switch (this.type) {
        case NodeTest.NAMETESTANY:
            if (n.nodeType == 2 /*Node.ATTRIBUTE_NODE*/
                    || n.nodeType == 1 /*Node.ELEMENT_NODE*/

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Function scrapeElement has a Cognitive Complexity of 23 (exceeds 5 allowed). Consider refactoring.

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Scraper.prototype.scrapeElement = function(doc, element, scrapeUrl, key, follow_url) {
  var scraper = this;
  follow_url = typeof follow_url !== 'undefined' ? follow_url : false;
  // extract element
  key = key || element.name;

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Function coalesceText has a Cognitive Complexity of 22 (exceeds 5 allowed). Consider refactoring.

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Utilities.coalesceText = function(n) {
    for (var m = n.firstChild; m != null; m = m.nextSibling) {
        if (m.nodeType == 3 /*Node.TEXT_NODE*/ || m.nodeType == 4 /*Node.CDATA_SECTION_NODE*/) {
            var s = m.nodeValue;
            var first = m;

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File scraper.js has 283 lines of code (exceeds 250 allowed). Consider refactoring.

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// # Scraper
//
// > Scraper class in the Node.js Thresher package.
// >
// > author: [Richard Smith-Unna](http://blahah/net)

Function parse has 53 lines of code (exceeds 25 allowed). Consider refactoring.

Open

XPathParser.prototype.parse = function(s) {
    var types;
    var values;
    var res = this.tokenize(s);
    if (res == undefined) {

Function order has a Cognitive Complexity of 16 (exceeds 5 allowed). Consider refactoring.

Open

AVLTree.prototype.order = function(n1, n2) {
    if (n1 === n2) {
        return 0;
    }
    var d1 = 0;

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Function balance has a Cognitive Complexity of 16 (exceeds 5 allowed). Consider refactoring.

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AVLTree.prototype.balance = function() {
    var ldepth = this.left  == null ? 0 : this.left.depth;
    var rdepth = this.right == null ? 0 : this.right.depth;

    if (ldepth > rdepth + 1) {

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