Found it by you! I developed the extension from scratch using the TextMate grammar definition, and the source code is on my github repo, https://github.com/77QingLiu/vscode-SAS.tmLanguage. This extension covers some basic functions like highlighting and auto-complete with SAS-like colors, but lack of modern syntax highlighting features like syntax linting, go to definition, on the fly function due to the limitation of TextMate grammar definition. It would be great if someone could develop the syntax highlighting engine based on the language server though it does require a fair bit of work.
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