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Draft: Add expression language specification

Arran Walkerrequested to merge
ajwalker/expression-spec into main

Documents expression language specification.

  • This is certainly not finished, it's just everything I'm hopeful we can agree on: JSON + logical operators + function calls.
  • This is just the language spec. I do have a working implementation, where the type/value system propagates "marks" (for marking values sensitive etc.).
  • Some implementation details are outside the scope of this document.

Markdown preview of this document can be found here.

The lexer for this language can be found here: Draft: Implement expression lexer (!234 - closed)

Closes #228

Edited by Arran Walker

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