tabIndent = {
version: '0.1.8',
config: {
tab: '\t'
},
events: {
keydown: function(e) {
var tab = tabIndent.config.tab;
var tabWidth = tab.length;
if (e.keyCode === 9) {
e.preventDefault();
var currentStart = this.selectionStart,
currentEnd = this.selectionEnd;
if (e.shiftKey === false) {
// Normal Tab Behaviour
if (!tabIndent.isMultiLine(this)) {
// Add tab before selection, maintain highlighted text selection
this.value = this.value.slice(0, currentStart) + tab + this.value.slice(currentStart);
this.selectionStart = currentStart + tabWidth;
this.selectionEnd = currentEnd + tabWidth;
} else {
// Iterating through the startIndices, if the index falls within selectionStart and selectionEnd, indent it there.
var startIndices = tabIndent.findStartIndices(this),
l = startIndices.length,
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) : this.value.length);
}
} else {
// Shift-Tab Behaviour
if (!tabIndent.isMultiLine(this)) {
if (this.value.substr(currentStart - tabWidth, tabWidth) == tab) {
// If there's a tab before the selectionStart, remove it
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) {
// However, if the selection is at the start of the line, and the first character is a tab, remove it
this.value = this.value.substring(0, currentStart) + this.value.substr(currentStart + tabWidth);
this.selectionStart = currentStart;
this.selectionEnd = currentEnd - tabWidth;
}
} else {
// Iterating through the startIndices, if the index falls within selectionStart and selectionEnd, remove an indent from that row
var startIndices = tabIndent.findStartIndices(this),
l = startIndices.length,
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) {
// Remove a tab
this.value = this.value.slice(0, startIndices[l]) + this.value.slice(startIndices[l] + tabWidth);
affectedRows++;
} else {} // Do nothing
newStart = startIndices[l];
if (!newEnd) newEnd = (startIndices[l+1] ? startIndices[l+1] - 1 : 'end');
}
}
this.selectionStart = newStart;
this.selectionEnd = (newEnd !== 'end' ? newEnd - (affectedRows * tabWidth) : this.value.length);
}
}
} else if (e.keyCode === 27) { // Esc
tabIndent.events.disable(e);
} else if (e.keyCode === 13 && e.shiftKey === false) { // Enter
var self = tabIndent,
cursorPos = this.selectionStart,
startIndices = self.findStartIndices(this),
numStartIndices = startIndices.length,
startIndex = 0,
endIndex = 0,
tabMatch = new RegExp("^" + tab.replace('\t', '\\t').replace(/ /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 = this.value.length;
}
}
lineText = this.value.slice(startIndex, endIndex);
tabs = lineText.match(tabMatch);
if (tabs !== null) {
e.preventDefault();
var indentText = tabs[0];
var indentWidth = indentText.length;
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;
// Temporarily suspend the main tabIndent event
tabIndent.remove(e.target);
},
focus: function() {
var self = tabIndent,
el = this,
delayedRefocus = setTimeout(function() {
var classes = (el.getAttribute('class') || '').split(' '),
contains = classes.indexOf('tabIndent');
el.addEventListener('keydown', self.events.keydown);
el.style.backgroundImage = "url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAQAAADZc7J/AAAAAmJLR0QA/4ePzL8AAAAJcEhZcwAAAEgAAABIAEbJaz4AAAKZSURBVEjH7ZRfSFNRHMe/9+/+3G26tUn+ycywgURgUBAUJlIhWlEQEjN8yQcfolKJxJAefOjRCnT0IPYQ9iRa9FAYJiaUVP4twf7gzJzpnDbdzHt3z+3Fua3dO4Ne/f5ezjmc8+F7zvmeA2zrv0VFGlexAssFw1mG1pqqUL8npGY60Bw3ykYaOVjlrFXmEyw0AQj6g53UONQBO8DBzuiT2tUx+gR/mwACBQpIUoACBZoAZaOSiWwFIFs4oMMS9/boZVF8T8vtkbEofatiRKF9mXK6M7tTyyxRaPwWtJezIu9+9cNzxHk/n9938rz6IWpvgRdZd5/HcsvC9jadqk6Z0qkBiCaAF3UtX8cy6h1mwlnLhsuZuRvqABlyNJqb0q0ZWsb7uUVHlXAahWl1y3M2tVuQVR1Q0Pl0dwZ67KbZtGnX/ma++/FsCCY1ANlAxIuT2NZP3XB/GRKc9qKhKTYnd4auJbIqINEBDa5zoWWByoS1jocR+loKpKGJKqBLybN/OQN2Tmodv4jCtYIMYurnP5sLf+V5XK4DbFv4haaDCEABA/J88GdegD1I2+heY0Xj7M1itiMjP8srzutjXMbkIDZKCrAcfGOt8LwODimYnzzjLcHIx5VFwPekZrhVPYmxyVNAvZP8KV28SykClo6XF4/t9LpC2TTIteulJepJjD5nCjL8E56sMHt40NYYqE51ZnZIfmGXYBC68p/6v6UkApSI8Y2ejPVKhyE0PdLDPcg+Z003G0W7YUmmvo/WtjXgbiKAAQNGpjYRDOwWILx3dV16ZBsx3QsdYi4JNUw6uCvMbrUcWFAvPWznfH9/GQHR5xAbPuTumRFWvS+ZwDGyJFfidkxWk2oaIfTRk8RI0YqMAQBAL7YVrz/iUDx4QII4/QAAACV0RVh0ZGF0ZTpjcmVhdGUAMjAxMi0xMi0wMVQwMDowNjo0My0wNTowMLKpTWYAAAAldEVYdGRhdGU6bW9kaWZ5ADIwMTItMTItMDFUMDA6MDY6NDMtMDU6MDDD9PXaAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAABJRU5ErkJggg==)";
el.style.backgroundPosition = 'top right';
el.style.backgroundRepeat = 'no-repeat';
if (contains !== -1) classes.splice(contains, 1);
classes.push('tabIndent-rendered');
el.setAttribute('class', classes.join(' '));
el.removeEventListener('focus', self.events.keydown);
}, 500);
// If they were just tabbing through the input, let them continue unimpeded
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() {
// Find all elements with the tabIndent class
var textareas = document.getElementsByTagName('textarea'),
t = textareas.length,
contains = -1,
classes = [],
el = undefined;
while(t--) {
classes = (textareas[t].getAttribute('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 = (el.getAttribute('class') || '').split(' '),
contains = classes.indexOf('tabIndent-rendered');
if (contains !== -1) {
el.removeEventListener('keydown', this.events.keydown);
el.style.backgroundImage = '';
classes.splice(contains, 1);
classes.push('tabIndent');
el.setAttribute('class', (classes.length > 1 ? classes.join(' ') : classes[0]));
}
}
},
removeAll: function() {
// Find all elements with the tabIndent class
var textareas = document.getElementsByTagName('textarea'),
t = textareas.length,
contains = -1,
classes = [],
el = undefined;
while(t--) {
classes = (textareas[t].getAttribute('class') || '').split(' ');
contains = classes.indexOf('tabIndent-rendered');
if (contains !== -1) {
el = textareas[t];
this.remove(el);
}
contains = -1;
classes = [];
el = undefined;
}
},
isMultiLine: function(el) {
// Extract the selection
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/) && text.match(/\n/).length > 0) {
offset = (startIndices.length > 0 ? startIndices[startIndices.length - 1] : 0);
var lineEnd = text.search("\n");
startIndices.push(lineEnd + offset + 1);
text = text.substring(lineEnd + 1);
}
startIndices.unshift(0);
return startIndices;
}
}