Lex Jupyter Magic in assignment value position #30
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parser/src/lexer.rs
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| @@ -1292,6 +1309,7 @@ where | |||
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| // Helper function to emit a lexed token to the queue of tokens. | |||
| fn emit(&mut self, spanned: Spanned) { | |||
| self.last_emitted = Some(spanned.0.clone()); | |||
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This seems a bit expensive as we'll be cloning every single token for the entire source code. Can we maybe look at the pending token instead?
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Yeah, that's very expensive because it even has to clone the heap allocations of the tokens.
Some optimisations: Only store the token kind (see ruff-python-ast TokenKind) which is only a u8.
Track the context explicitly:
https://github.com/mozilla/sweet.js/wiki/design and an implementation of it https://github.com/swc-project/swc/blob/026101b71e942ad2d7ff906cb68bf46345d77712/crates/swc_ecma_parser/src/lexer/state.rs#L756-L797
In your case it seems all you really care about is whether you've seen an equal token. But it would be nice if the chosen approach could eventually replace the SoftKeywordTokenizer as well.
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In your case it seems all you really care about is whether you've seen an
equaltoken.
Yes, I think having a boolean stating "Was the last token an Equal?" seems like the simplest option. I'll explore a bit around lexer context and state after this as it's pretty interesting :)
| pwd = !pwd | ||
| foo = %timeit a = b | ||
| bar = %timeit a % 3 | ||
| baz = %matplotlib \ | ||
| inline" |
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All of the valid positions for magic command token in terms of an assignment statement.
| let source = r" | ||
| # Other magic kinds are not valid here (can't test `foo = ?str` because '?' is not a valid token) | ||
| foo = /func | ||
| foo = ;func | ||
| foo = ,func | ||
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| (foo == %timeit a = b) | ||
| (foo := %timeit a = b) | ||
| def f(arg=%timeit a = b): | ||
| pass" | ||
| .trim(); |
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These aren't valid: parenthesized, any token other than Equal, nested
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This reverts commit 0a909cc. This will be added in the next PR.
Cloning is expensive especially for every token.
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Emit
MagicCommandtoken when it is the assignment value1 i.e., on the right side of an assignment statement.Examples:
Footnotes
Only
%and!are valid in that position, other magic kinds are not valid ↩