ApplyLSPTextDocumentContentChangeEvent applies the LSP change in the given text.

ApplyTextChange replaces startingText substring specified by replaceRange with insertText.

ExtractRange extract a piece of text from a text document given the range.

GetLineOffset finds the offset/position of the beginning of a line within the text.

GetOffset computes the offset in the text expressed by the lsp.Position.

OutOfRangeError returned if one attempts to access text out of its range.