tabIndent = { 
version: '0.1.8',
config: { 
tab: '  '}
,
events: { 
keydown: function (e){ 
var tab = tabIndent.config.tab; 
var tabWidth = _AN_Read_length('length', tab); 
if (e.keyCode === 9) { 
e.preventDefault(); 
var currentStart = this.selectionStart, currentEnd = this.selectionEnd; 
if (e.shiftKey === false ) { 
if (!tabIndent.isMultiLine(this)) { 
this.value = this.value.slice(0, currentStart) + tab + this.value.slice(currentStart); 
this.selectionStart = currentStart + tabWidth; 
this.selectionEnd = currentEnd + tabWidth; 
} 
 else { 
var startIndices = tabIndent.findStartIndices(this), l = _AN_Read_length('length', startIndices), newStart = undefined, newEnd = undefined, affectedRows = 0; 
while (l-- ){ 
var lowerBound = startIndices[l]; 
if (startIndices[l + 1] && currentStart != startIndices[l + 1]) lowerBound = startIndices[l + 1]; 
if (lowerBound >= currentStart && startIndices[l] < currentEnd) { 
this.value = this.value.slice(0, startIndices[l]) + tab + this.value.slice(startIndices[l]); 
newStart = startIndices[l]; 
if (!newEnd) newEnd = (startIndices[l + 1]? startIndices[l + 1] - 1: 'end'); 
affectedRows++ ; 
} 
} 
this.selectionStart = newStart; 
this.selectionEnd = (newEnd !== 'end'? newEnd + (tabWidth * affectedRows): _AN_Read_length('length', this.value)); 
} 
} 
 else { 
if (!tabIndent.isMultiLine(this)) { 
if (this.value.substr(currentStart - tabWidth, tabWidth) == tab) { 
this.value = this.value.substr(0, currentStart - tabWidth) + this.value.substr(currentStart); 
this.selectionStart = currentStart - tabWidth; 
this.selectionEnd = currentEnd - tabWidth; 
} 
 else if (this.value.substr(currentStart - 1, 1) == "\n" && this.value.substr(currentStart, tabWidth) == tab) { 
this.value = this.value.substring(0, currentStart) + this.value.substr(currentStart + tabWidth); 
this.selectionStart = currentStart; 
this.selectionEnd = currentEnd - tabWidth; 
} 
} 
 else { 
var startIndices = tabIndent.findStartIndices(this), l = _AN_Read_length("length", startIndices), newStart = undefined, newEnd = undefined, affectedRows = 0; 
while (l-- ){ 
var lowerBound = startIndices[l]; 
if (startIndices[l + 1] && currentStart != startIndices[l + 1]) lowerBound = startIndices[l + 1]; 
if (lowerBound >= currentStart && startIndices[l] < currentEnd) { 
if (this.value.substr(startIndices[l], tabWidth) == tab) { 
this.value = this.value.slice(0, startIndices[l]) + this.value.slice(startIndices[l] + tabWidth); 
affectedRows++ ; 
} 
 else { 
} 
newStart = startIndices[l]; 
if (!newEnd) newEnd = (startIndices[l + 1]? startIndices[l + 1] - 1: 'end'); 
} 
} 
this.selectionStart = newStart; 
this.selectionEnd = (newEnd !== 'end'? newEnd - (affectedRows * tabWidth): _AN_Read_length('length', this.value)); 
} 
} 
} 
 else if (e.keyCode === 27) { 
tabIndent.events.disable(e); 
} 
 else if (e.keyCode === 13 && e.shiftKey === false ) { 
var self = tabIndent, cursorPos = this.selectionStart, startIndices = self.findStartIndices(this), numStartIndices = _AN_Read_length('length', startIndices), startIndex = 0, endIndex = 0, tabMatch = new RegExp("^" + (_AN_Call_replace("replace", _AN_Call_replace("replace", tab, '\t', '\\t'), / /g, '\\s')) + "+", 'g'), lineText = ''; 
tabs = null ; 
for (var x = 0; 
x < numStartIndices; x++ ){ 
if (startIndices[x + 1] && (cursorPos >= startIndices[x]) && (cursorPos < startIndices[x + 1])) { 
startIndex = startIndices[x]; 
endIndex = startIndices[x + 1] - 1; 
break ; 
} 
 else { 
startIndex = startIndices[numStartIndices - 1]; 
endIndex = _AN_Read_length('length', this.value); 
} 
} 
lineText = this.value.slice(startIndex, endIndex); 
tabs = lineText.match(tabMatch); 
if (tabs !== null ) { 
e.preventDefault(); 
var indentText = tabs[0]; 
var indentWidth = _AN_Read_length('length', indentText); 
var inLinePos = cursorPos - startIndex; 
if (indentWidth > inLinePos) { 
indentWidth = inLinePos; 
indentText = indentText.slice(0, inLinePos); 
} 
this.value = this.value.slice(0, cursorPos) + "\n" + indentText + this.value.slice(cursorPos); 
this.selectionStart = cursorPos + indentWidth + 1; 
this.selectionEnd = this.selectionStart; 
} 
} 
} 
,
disable: function (e){ 
var events = this; 
tabIndent.remove(_AN_Read_target("target", e)); 
} 
,
focus: function (){ 
var self = tabIndent, el = this, delayedRefocus = _AN_Call_settimeout("setTimeout", window, function (){ 
var classes = (_AN_Call_getattribute("getAttribute", el, 'class') || '').split(' '), contains = classes.indexOf('tabIndent'); 
el.addEventListener('keydown', self.events.keydown); 
if (contains !== -1) classes.splice(contains, 1); 
classes.push('tabIndent-rendered'); 
_AN_Call_setattribute('setAttribute', el, 'class', classes.join(' ')); 
el.removeEventListener('focus', self.events.keydown); 
} 
, 500); 
el.addEventListener('blur', function b(){ 
clearTimeout(delayedRefocus); 
el.removeEventListener('blur', b); 
} 
); 
} 
}
,
render: function (el){ 
var self = this; 
if (el.nodeName === 'TEXTAREA') { 
el.addEventListener('focus', self.events.focus); 
el.addEventListener('blur', function b(e){ 
self.events.disable(e); 
} 
); 
} 
} 
,
renderAll: function (){ 
var textareas = _AN_Call_getelementsbytagname('getElementsByTagName', document, 'textarea'), t = _AN_Read_length('length', textareas), contains = -1, classes = [] , el = undefined; 
while (t-- ){ 
classes = (_AN_Call_getattribute('getAttribute', textareas[t], 'class') || '').split(' '); 
contains = classes.indexOf('tabIndent'); 
if (contains !== -1) { 
el = textareas[t]; 
this.render(el); 
} 
contains = -1; 
classes = [] ; 
el = undefined; 
} 
} 
,
remove: function (el){ 
if (el.nodeName === 'TEXTAREA') { 
var classes = (_AN_Call_getattribute('getAttribute', el, 'class') || '').split(' '), contains = classes.indexOf('tabIndent-rendered'); 
if (contains !== -1) { 
el.removeEventListener('keydown', this.events.keydown); 
_AN_Write_backgroundimage('backgroundImage', el.style, false , ''); 
classes.splice(contains, 1); 
classes.push('tabIndent'); 
_AN_Call_setattribute('setAttribute', el, 'class', (_AN_Read_length('length', classes) > 1? classes.join(' '): classes[0])); 
} 
} 
} 
,
removeAll: function (){ 
var textareas = _AN_Call_getelementsbytagname('getElementsByTagName', document, 'textarea'), t = _AN_Read_length('length', textareas), contains = -1, classes = [] , el = undefined; 
while (t-- ){ 
classes = (_AN_Call_getattribute('getAttribute', textareas[t], 'class') || '').split(' '); 
contains = classes.indexOf('tabIndent-rendered'); 
if (contains !== -1) { 
el = textareas[t]; 
this.remove(el); 
} 
contains = -1; 
classes = [] ; 
el = undefined; 
} 
} 
,
isMultiLine: function (el){ 
var snippet = el.value.slice(el.selectionStart, el.selectionEnd), nlRegex = new RegExp(/\n/); 
if (nlRegex.test(snippet)) return true ; 
 else return false ; 
} 
,
findStartIndices: function (el){ 
var text = el.value, startIndices = [] , offset = 0; 
while (text.match(/\n/) && _AN_Read_length('length', text.match(/\n/)) > 0){ 
offset = (_AN_Read_length('length', startIndices) > 0? startIndices[_AN_Read_length('length', startIndices) - 1]: 0); 
var lineEnd = text.search("\n"); 
startIndices.push(lineEnd + offset + 1); 
text = text.substring(lineEnd + 1); 
} 
startIndices.unshift(0); 
return startIndices; 
} 
}
;