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Allow backticks with zero interpolating expressions.

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Alexander McCord 2022-07-27 15:57:46 -07:00 • committed by GitHub
parent 5b8d8535b5
commit 39faa903b1
Signed by: DevComp
GPG key ID: 4AEE18F83AFDEB23
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rfcs/syntax-string-interpolation.md
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@ -31,7 +31,6 @@ Because we care about backward compatibility, we need some new syntax in order t
1. A string chunk (`` `...{ ``, `}...{`, and `` }...` ``) where `...` is a range of 0 to many characters. 1. A string chunk (`` `...{ ``, `}...{`, and `` }...` ``) where `...` is a range of 0 to many characters.
* `\` escapes `` ` ``, `{`, and itself `\`. * `\` escapes `` ` ``, `{`, and itself `\`.
* 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.
* Restriction: we explicitly reject `{{` as it is considered an attempt to escape and get a single `{` character at runtime. * Restriction: we explicitly reject `{{` as it is considered an attempt to escape and get a single `{` character at runtime.
@ -62,7 +61,6 @@ local set2 = Set.new({0, 5, 4})
print(`{set1} ∪ {set2} = {Set.union(set1, set2)}`) print(`{set1} ∪ {set2} = {Set.union(set1, set2)}`)
--> {0, 1, 3} ∪ {0, 5, 4} = {0, 1, 3, 4, 5} --> {0, 1, 3} ∪ {0, 5, 4} = {0, 1, 3, 4, 5}
-- For illustrative purposes. These are illegal specifically because they don't interpolate anything.
print(`Some example escaping the braces \{like so}`) print(`Some example escaping the braces \{like so}`)
print(`backslash \ that escapes the space is not a part of the string...`) print(`backslash \ that escapes the space is not a part of the string...`)
print(`backslash \\ will escape the second backslash...`) print(`backslash \\ will escape the second backslash...`)