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Fix interpolated expressions.

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Alexander McCord 2021-11-12 06:18:08 -08:00 • committed by GitHub
parent 8d47beec84
commit 70736c5326
Signed by: DevComp
GPG key ID: 4AEE18F83AFDEB23
1 changed files with 4 additions and 3 deletions
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7
rfcs/syntax-string-interpolation.md
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@ -60,6 +60,7 @@ 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(`% that doesn't escape anything is part of the string...`) print(`% that doesn't escape anything is part of the string...`)
print(`%% will escape the second %...`) print(`%% will escape the second %...`)
@ -76,12 +77,12 @@ As for how newlines are handled, they are handled the same as other string liter
local name = "Luau" local name = "Luau"
print(`Welcome to { print(`Welcome to {
Luau name
}!`) }!`)
--> Welcome to Luau! --> Welcome to Luau!
print(`Welcome to \ print(`Welcome to \
{Luau}!`) {name}!`)
--> Welcome to --> Welcome to
-- Luau! -- Luau!
``` ```
@ -90,7 +91,7 @@ This expression will not be allowed to come after a `prefixexp`. I believe this
``` ```
local name = "world" local name = "world"
print`Hello {world}` print`Hello {name}`
``` ```
Since the string interpolation expression is going to be lowered into a `string.format` call, we'll also need to extend `string.format`. The bare minimum to support the lowering is to add a new token whose definition is to perform a `tostring` call. `%*` is currently an invalid token, so this is a backward compatible extension. This RFC shall define `%*` to have the same behavior as if `tostring` was called. Since the string interpolation expression is going to be lowered into a `string.format` call, we'll also need to extend `string.format`. The bare minimum to support the lowering is to add a new token whose definition is to perform a `tostring` call. `%*` is currently an invalid token, so this is a backward compatible extension. This RFC shall define `%*` to have the same behavior as if `tostring` was called.