improved error handling #120
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aaronjanse
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Jul 27, 2022
src/parser.rs
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| match self.peek_any_or_missing(&[TOKEN_INTERPOL_START, TOKEN_STRING_START, TOKEN_IDENT]) { | ||
| Some(TOKEN_INTERPOL_START) => self.parse_dynamic(), | ||
| Some(TOKEN_STRING_START) => self.parse_string(), | ||
| Some(TOKEN_IDENT) => self.expect_ident(), | ||
| _ => { | ||
| break | ||
| } | ||
| } |
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I personally don't love the repetition here, but I think it's not too bad?
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aaronjanse
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Jul 27, 2022
| @@ -0,0 +1 @@ | |||
| { foo = 1 bar = 2} // { xyz = 3; } No newline at end of file | |||
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It's fun seeing how Github syntax highlighting, on the other hand, is not fault-tolerant
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I now realize this duplicates work done by @oberblastmeister in #35 |
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Summary & Motivation
This adds helper methods for expecting a token, bumping only if it exists. Using these methods, I improved error handling in two ways:
{ foo = 1 } // { bar = 2; }will now be parsed correctly, with the needed semicolon token simply missing (and appropriate error). Previously, this was parsed as one set with a large error node.{ foo = bar.; xyz = 1; }are parsed as missing an attractive path rather than having a large error node consuming most of the tokens.Further context
Replaces #34. This PR is needed to implement autocomplete in rnix-lsp for expressions like
foo.. I'm sure several other tools will find improved error handling helpful too.