C# Class Microsoft.R.Editor.Tree.TreeUpdateTask

Applies queued changes to the tree. Must only be called in a main thread context.

Makes sure all pending changes are processed and applied to the tree

Idle time event handler. Kicks background parsing if there are pending changes

Text buffer change event handler. Performs analysis of the change. If change is trivial, such as change in whitespace (excluding line breaks that in R may be sensistive), simply applies the changes by shifting tree elements. If some elements get deleted or otherwise damaged, removes them from the tree right away. Non-trivial changes are queued for background parsing which starts on next on idle. Methond must be called on a main thread only, typically from an event handler that receives text buffer change events.

Handles non-trivial changes like changes that delete elements, change identifier names, introducing new braces: changes that cannot be handled without background parse.

Processes text buffer changed accumulated so far. Typically called on idle.

Handles simple (safe) changes.

Main asyncronous task body

Resumes tree updates. If changes were made to the text buffer since suspend, full parse is performed.

Suspend tree updates. Typically called before massive changes to the document.