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Disambiguate this bit such that it rejects the formatting specification syntax.

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Alexander McCord 2021-11-19 12:56:51 -08:00 • committed by GitHub
parent 253e3b8caf
commit 722f8b6908
Signed by: DevComp
GPG key ID: 4AEE18F83AFDEB23
1 changed files with 3 additions and 2 deletions
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rfcs/syntax-string-interpolation.md
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@ -34,9 +34,10 @@ Because we care about backward compatibility, we need some new syntax in order t
* Restriction: the string interpolation literal must have at least one value to interpolate. We do not need 3 ways to express a single line string literal. * Restriction: the string interpolation literal must have at least one value to interpolate. We do not need 3 ways to express a single line string literal.
* The pairs must be on the same line (unless a `\` escapes the newline) but expressions needn't be on the same line. * The pairs must be on the same line (unless a `\` escapes the newline) but expressions needn't be on the same line.
2. An expression between the braces. This is the value that will be interpolated into the string. 2. An expression between the braces. This is the value that will be interpolated into the string.
3. Formatting specification may follow the expression, delimited by an unambiguous character. 3. Formatting specification may follow after the expression, delimited by an unambiguous character.
* Restriction: the formatting specification must be constant at parse time. * Restriction: the formatting specification must be constant at parse time.
* The syntax for formatting specification and a delimiter is undefined in this RFC. A future RFC will implement this. * In the absence of an explicit formatting specification, the `%*` token will be used.
* For now, we explicitly reject any formatting specification syntax. A future extension may be introduced to extend the syntax with an optional specification.
To put the above into formal EBNF grammar: To put the above into formal EBNF grammar: