feat(lex,parse): Add stub try/catch implementation #611
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RBI 9.4 adds support for error handling via the `try`/`catch` model [1]. Interestingly, `try`, `catch`, and `endtry` are all valid identifiers! That makes parsing a little bit tougher, but it's not unprecedented in this language. Detect `try`/`catch`/throw`/`end try` during lexing and emit the proper lexemes. [1] https://developer.roku.com/docs/references/brightscript/language/error-handling.html see #554
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Throwing exceptions and catching them aren't yet supported in `brs`, so executing only the `try` block seems to be a reasonable "bare minimum" approach to try/catch support. Handle `try`, `catch`, and `end try` lexemes in the parser, emitting TryCatch statements for the interpreter to execute naïvely. see #554
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Jan 21, 2021
| @@ -94,6 +98,8 @@ export const KeyWords: { [key: string]: L } = { | |||
| stop: L.Stop, | |||
| sub: L.Sub, | |||
| to: L.To, | |||
| try: L.Try, | |||
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Noob question: why are try and endtry keywords but not reserved words while throw is both?
This was referenced Nov 29, 2023
|
Try..Catch and Throw implementation was finished in the Roku Community fork: |
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Implementing
try/catch/throwtakes a good bit of work in the interpreter, so I'm splitting that into two pull requests. This one includes parsingtry/catch/end try(withoutthrow), and always executes only thetryblock to maintain backwards compatibility. It's a weird partial state, but the alternative is a massive pull request that can't be reasonably reviewed or understood.see #554