this.insertSnippet = function()

in public/webpackShims/ace/ext-language_tools.js [378:479]
69 lines of code
16 McCabe index (conditional complexity)

    this.insertSnippet = function(editor, snippetText) {
        var cursor = editor.getCursorPosition();
        var line = editor.session.getLine(cursor.row);
        var indentString = line.match(/^\s*/)[0];
        var tabString = editor.session.getTabString();

        var tokens = this.tokenizeTmSnippet(snippetText);
        tokens = this.resolveVariables(tokens, editor);
        tokens = tokens.map(function(x) {
            if (x == "\n")
                return x + indentString;
            if (typeof x == "string")
                return x.replace(/\t/g, tabString);
            return x;
        });
        var tabstops = [];
        tokens.forEach(function(p, i) {
            if (typeof p != "object")
                return;
            var id = p.tabstopId;
            var ts = tabstops[id];
            if (!ts) {
                ts = tabstops[id] = [];
                ts.index = id;
                ts.value = "";
            }
            if (ts.indexOf(p) !== -1)
                return;
            ts.push(p);
            var i1 = tokens.indexOf(p, i + 1);
            if (i1 === -1)
                return;

            var value = tokens.slice(i + 1, i1);
            var isNested = value.some(function(t) {return typeof t === "object"});          
            if (isNested && !ts.value) {
                ts.value = value;
            } else if (value.length && (!ts.value || typeof ts.value !== "string")) {
                ts.value = value.join("");
            }
        });
        tabstops.forEach(function(ts) {ts.length = 0});
        var expanding = {};
        function copyValue(val) {
            var copy = []
            for (var i = 0; i < val.length; i++) {
                var p = val[i];
                if (typeof p == "object") {
                    if (expanding[p.tabstopId])
                        continue;
                    var j = val.lastIndexOf(p, i - 1);
                    p = copy[j] || {tabstopId: p.tabstopId};
                }
                copy[i] = p;
            }
            return copy;
        }
        for (var i = 0; i < tokens.length; i++) {
            var p = tokens[i];
            if (typeof p != "object")
                continue;
            var id = p.tabstopId;
            var i1 = tokens.indexOf(p, i + 1);
            if (expanding[id] == p) { 
                expanding[id] = null;
                continue;
            }
            
            var ts = tabstops[id];
            var arg = typeof ts.value == "string" ? [ts.value] : copyValue(ts.value);
            arg.unshift(i + 1, Math.max(0, i1 - i));
            arg.push(p);
            expanding[id] = p;
            tokens.splice.apply(tokens, arg);

            if (ts.indexOf(p) === -1)
                ts.push(p);
        };
        var row = 0, column = 0;
        var text = "";
        tokens.forEach(function(t) {
            if (typeof t === "string") {
                if (t[0] === "\n"){
                    column = t.length - 1;
                    row ++;
                } else
                    column += t.length;
                text += t;
            } else {
                if (!t.start)
                    t.start = {row: row, column: column};
                else
                    t.end = {row: row, column: column};
            }
        });
        var range = editor.getSelectionRange();
        var end = editor.session.replace(range, text);

        var tabstopManager = new TabstopManager(editor);
        tabstopManager.addTabstops(tabstops, range.start, end);
        tabstopManager.tabNext();
    };