var sendText = function()

in lib/ace/keyboard/textinput.js [293:363]
62 lines of code
25 McCabe index (conditional complexity)

    var sendText = function(value, fromInput) {
        if (afterContextMenu)
            afterContextMenu = false;
        if (pasted) {
            resetSelection();
            if (value)
                host.onPaste(value);
            pasted = false;
            return "";
        } else {
            var selectionStart = text.selectionStart;
            var selectionEnd = text.selectionEnd;
        
            var extendLeft = lastSelectionStart;
            var extendRight = lastValue.length - lastSelectionEnd;
            
            var inserted = value;
            var restoreStart = value.length - selectionStart;
            var restoreEnd = value.length - selectionEnd;
        
            var i = 0;
            while (extendLeft > 0 && lastValue[i] == value[i]) {
                i++;
                extendLeft--;
            }
            inserted = inserted.slice(i);
            i = 1;
            while (extendRight > 0 && lastValue.length - i > lastSelectionStart - 1  && lastValue[lastValue.length - i] == value[value.length - i]) {
                i++;
                extendRight--;
            }
            restoreStart -= i-1;
            restoreEnd -= i-1;
            var endIndex = inserted.length - i + 1;
            if (endIndex < 0) {
                extendLeft = -endIndex;
                endIndex = 0;
            } 
            inserted = inserted.slice(0, endIndex);
            
            // composition update can be called without any change
            if (!fromInput && !inserted && !restoreStart && !extendLeft && !extendRight && !restoreEnd)
                return "";
            sendingText = true;
            
            // some android keyboards converts two spaces into sentence end, which is not useful for code
            var shouldReset = false;
            if (useragent.isAndroid && inserted == ". ") {
                inserted = "  ";
                shouldReset = true;
            }
            
            if (inserted && !extendLeft && !extendRight && !restoreStart && !restoreEnd || commandMode) {
                host.onTextInput(inserted);
            } else {
                host.onTextInput(inserted, {
                    extendLeft: extendLeft,
                    extendRight: extendRight,
                    restoreStart: restoreStart,
                    restoreEnd: restoreEnd
                });
            }
            sendingText = false;
            
            lastValue = value;
            lastSelectionStart = selectionStart;
            lastSelectionEnd = selectionEnd;
            lastRestoreEnd = restoreEnd;
            return shouldReset ? "\n" : inserted;
        }
    };