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Rename ${length()} to ${len()} #111

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Merged
Veykril merged 1 commit into from
May 26, 2025
Merged

Rename ${length()} to ${len()} #111

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4 changes: 2 additions & 2 deletions src/decl-macros/macros-methodical.md
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Original file line number Diff line number Diff line change
Expand Up @@ -257,8 +257,8 @@ The following expressions are available with `ident` being the name of a bound m
- `${count(ident, depth)}`: The number of times `$ident` repeats in the repetition at `depth`.
- `${index()}`: The current repetition index of the inner-most repetition. This is equivalent to `${index(0)}`.
- `${index(depth)}`: The current index of the repetition at `depth`, counting outwards.
- `${length()}`: The number of times the inner-most repetition will repeat for. This is equivalent to `${length(0)}`.
- `${length(depth)}`: The number of times the repetition at `depth` will repeat for, counting outwards.
- `${len()}`: The number of times the inner-most repetition will repeat for. This is equivalent to `${len(0)}`.
- `${len(depth)}`: The number of times the repetition at `depth` will repeat for, counting outwards.
- `${ignore(ident)}`: Binds `$ident` for repetition, while expanding to nothing.
- `$$`: Expands to a single `$`, effectively escaping the `$` token so it won't be transcribed.

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12 changes: 6 additions & 6 deletions src/decl-macros/minutiae/metavar-expr.md
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Expand Up @@ -13,7 +13,7 @@ This chapter will introduce them more in-depth together with usage examples.
- [Dollar Dollar (`$$`)](#dollar-dollar-)
- [`count($ident, depth)`](#countident-depth)
- [`index(depth)`](#indexdepth)
- [`length(depth)`](#lengthdepth)
- [`len(depth)`](#lengthdepth)
- [`ignore($ident)`](#ignoreident)

## Dollar Dollar (`$$`)
Expand Down Expand Up @@ -128,14 +128,14 @@ fn main() {
```


## `length(depth)`
## `len(depth)`

The `length(depth)` metavariable expression expands to the iteration count of the repetition at the given depth.
The `len(depth)` metavariable expression expands to the iteration count of the repetition at the given depth.

- The `depth` argument targets the repetition at `depth` counting outwards from the inner-most repetition where the expression is invoked.
- The expression expands to an unsuffixed integer literal token.

The `length()` expression defaults `depth` to `0`, making it a shorthand for `length(0)`.
The `len()` expression defaults `depth` to `0`, making it a shorthand for `len(0)`.


```rust,ignore
Expand All @@ -148,8 +148,8 @@ macro_rules! lets_count {
$(
println!(
"'{}' in inner iteration {}/{} with '{}' in outer iteration {}/{} ",
stringify!($inner), ${index()}, ${length()},
stringify!($outer), ${index(1)}, ${length(1)},
stringify!($inner), ${index()}, ${len()},
stringify!($outer), ${index(1)}, ${len(1)},
);
)*
)*
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