39 lines
1.6 KiB
Rust
39 lines
1.6 KiB
Rust
//! Convenience functions for formatting and parsing parameter values in common formats.
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use std::sync::Arc;
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/// Round an `f32` value to always have a specific number of decimal digits.
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pub fn f32_rounded(digits: usize) -> Arc<dyn Fn(f32) -> String + Send + Sync> {
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Arc::new(move |x| format!("{:.digits$}", x))
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}
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/// Format a `[0, 1]` number as a percentage. Does not include the percent sign, you should specify
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/// this as the parameter's unit.
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pub fn f32_percentage(digits: usize) -> Arc<dyn Fn(f32) -> String + Send + Sync> {
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Arc::new(move |value| format!("{:.digits$}", value * 100.0))
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}
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/// Parse a `[0, 100]` percentage to a `[0, 1]` number. Handles the percentage unit for you. Used in
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/// conjunction with [`f32_percentage`].
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pub fn from_f32_percentage() -> Arc<dyn Fn(&str) -> Option<f32> + Send + Sync> {
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Arc::new(|string| {
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string
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.trim_end_matches(&[' ', '%'])
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.parse()
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.ok()
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.map(|x: f32| x / 100.0)
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})
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}
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/// Format an order/power of two. Useful in conjunction with [`from_power_of_two()`] to limit
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/// integer parameter ranges to be only powers of two.
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pub fn i32_power_of_two() -> Arc<dyn Fn(i32) -> String + Send + Sync> {
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Arc::new(|value| format!("{}", 1 << value))
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}
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/// Parse a parameter input string to a power of two. Useful in conjunction with [`power_of_two()`]
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/// to limit integer parameter ranges to be only powers of two.
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pub fn from_i32_power_of_two() -> Arc<dyn Fn(&str) -> Option<i32> + Send + Sync> {
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Arc::new(|string| string.parse().ok().map(|n: i32| (n as f32).log2() as i32))
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}
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