(function () {
function forEach(arr, f) {
for (var i = 0, e = arr.length; i < e; ++i) f(arr[i]);
}

function arrayContains(arr, item) {
if (!Array.prototype.indexOf) {
var i = arr.length;
while (i--) {
if (arr[i] === item) {
return true;
}
}
return false;
}
return arr.indexOf(item) != -1;
}

function scriptHint(editor, keywords, getToken) {
// Find the token at the cursor
var cur = editor.getCursor(), token = getToken(editor, cur), tprop = token;
// If it's not a 'word-style' token, ignore the token.
if (!/^[\w$_]*$/.test(token.string)) {
token = tprop = {start: cur.ch, end: cur.ch, string: "", state: token.state,
className: token.string == "." ? "property" : null};
}
// If it is a property, find out what it is a property of.
while (tprop.className == "property") {
tprop = getToken(editor, {line: cur.line, ch: tprop.start});
if (tprop.string != ".") return;
tprop = getToken(editor, {line: cur.line, ch: tprop.start});
if (tprop.string == ')') {
var level = 1;
do {
tprop = getToken(editor, {line: cur.line, ch: tprop.start});
switch (tprop.string) {
case ')': level++; break;
case '(': level--; break;
default: break;
}
} while (level > 0)
tprop = getToken(editor, {line: cur.line, ch: tprop.start});
if (tprop.className == 'variable')
tprop.className = 'function';
else return; // no clue
}
if (!context) var context = [];
context.push(tprop);
}
return {list: getCompletions(token, context, keywords),
from: {line: cur.line, ch: token.start},
to: {line: cur.line, ch: token.end}};
}

CodeMirror.javascriptHint = function(editor) {
return scriptHint(editor, javascriptKeywords,
function (e, cur) {return e.getTokenAt(cur);});
}

function getCoffeeScriptToken(editor, cur) {
// This getToken, it is for coffeescript, imitates the behavior of
// getTokenAt method in javascript.js, that is, returning "property"
// type and treat "." as indepenent token.
var token = editor.getTokenAt(cur);
if (cur.ch == token.start + 1 && token.string.charAt(0) == '.') {
token.end = token.start;
token.string = '.';
token.className = "property";
}
else if (/^\.[\w$_]*$/.test(token.string)) {
token.className = "property";
token.start++;
token.string = token.string.replace(/\./, '');
}
return token;
}

CodeMirror.coffeescriptHint = function(editor) {
return scriptHint(editor, coffeescriptKeywords, getCoffeeScriptToken);
}

var stringProps = ("charAt charCodeAt indexOf lastIndexOf substring substr slice trim trimLeft trimRight " +
"toUpperCase toLowerCase split concat match replace search").split(" ");
var arrayProps = ("length concat join splice push pop shift unshift slice reverse sort indexOf " +
"lastIndexOf every some filter forEach map reduce reduceRight ").split(" ");
var funcProps = "prototype apply call bind".split(" ");
var javascriptKeywords = ("break case catch continue debugger default delete do else false finally for function " +
"if in instanceof new null return switch throw true try typeof var void while with").split(" ");
var coffeescriptKeywords = ("and break catch class continue delete do else extends false finally for " +
"if in instanceof isnt new no not null of off on or return switch then throw true try typeof until void while with yes").split(" ");

function getCompletions(token, context, keywords) {
var found = [], start = token.string;
function maybeAdd(str) {
if (str.indexOf(start) == 0 && !arrayContains(found, str)) found.push(str);
}
function gatherCompletions(obj) {
if (typeof obj == "string") forEach(stringProps, maybeAdd);
else if (obj instanceof Array) forEach(arrayProps, maybeAdd);
else if (obj instanceof Function) forEach(funcProps, maybeAdd);
for (var name in obj) maybeAdd(name);
}

if (context) {
// If this is a property, see if it belongs to some object we can
// find in the current environment.
var obj = context.pop(), base;
if (obj.className == "variable")
base = window[obj.string];
else if (obj.className == "string")
base = "";
else if (obj.className == "atom")
base = 1;
else if (obj.className == "function") {
if (window.jQuery != null && (obj.string == '$' || obj.string == 'jQuery') &&
(typeof window.jQuery == 'function'))
base = window.jQuery();
else if (window._ != null && (obj.string == '_') && (typeof window._ == 'function'))
base = window._();
}
while (base != null && context.length)
base = base[context.pop().string];
if (base != null) gatherCompletions(base);
}
else {
// If not, just look in the window object and any local scope
// (reading into JS mode internals to get at the local variables)
for (var v = token.state.localVars; v; v = v.next) maybeAdd(v.name);
gatherCompletions(window);
forEach(keywords, maybeAdd);
}
return found;
}
})();