Expand compile_error! #2362
Expand compile_error! #2362
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| let macro_content = { | ||
| // FIXME: verify that this is an ast::Literatal with kind() == LiteralKind.String, else error. | ||
| let arg = macro_call.token_tree().ok_or_else(|| mbe::ExpandError::UnexpectedToken)?; |
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You could get it by using tt , if it is valid , it should be a single subtree with one literal token-tree.
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Okay. Once I have the literal is there an existing funtion to validate it's type or do I need to manually parse the ends and look for quotes?
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As I know there is no existing function to validate it, so you may need to check whether it contains double quote. And if I remember correctly, the quote! macro support TokenTree too.
I think we could add a builtin error in |
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Could you actually give an error when |
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Maybe?I'm not too familiar with our diagnostics infra @matklad?
…On Fri, Nov 22, 2019 at 3:31 PM bjorn3 ***@***.***> wrote:
Could you actually give an error when compile_error is expanded?
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| match &tt.token_trees[0] { | ||
| tt::TokenTree::Leaf(tt::Leaf::Literal(it)) => { | ||
| let s = it.text.as_str(); | ||
| if s.starts_with(r#"""#) && s.ends_with(r#"""#) { |
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It may be a raw string, which start with r# , just checking whether it contains a double quote will be enough.
Nope, there's no infra for macro diagnostics yet |
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2362: Expand compile_error! r=edwin0cheng a=kjeremy Does not validate that the input is a string literal. I thought that I could `match_ast!` against the `macro_args` but that did not work. Even if it had I am not sure which error would be appropriate. Co-authored-by: Jeremy Kolb <kjeremy@gmail.com>
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Does not validate that the input is a string literal. I thought that I could
match_ast!against themacro_argsbut that did not work. Even if it had I am not sure which error would be appropriate.