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Weft

module

value

Interpolating CSS-ish values the way GSAP does: numbers with units, colours (hex, rgb(), rgba(), hsl(), named), relative values ("+=40"), and compound strings ("0 0 20px rgba(0,0,0,.5)") whose numbers are tweened while the rest stays put.

Structs

  • Shape

    A string split into literal text and numbers.

Functions

format_number

pub fn format_number(n: f64) -> String

Format a number for CSS output.

interpolate

pub fn interpolate(from: &str, to: &str, progress: f64) -> String

The value progress of the way from from to to (both strings). Numbers (and colours) are interpolated when the two have the same shape; a unitless side adopts the other side's units (0 → 40px). Otherwise the value jumps to to at the end.

normalize_colors

pub fn normalize_colors(s: &str) -> String

Replace every colour in a string with rgba(r, g, b, a) so colours line up for interpolation.

parse_color

pub fn parse_color(s: &str) -> Option<[f64; 4]>

Parse any supported colour to [r, g, b, a].

parse_hex

pub fn parse_hex(s: &str) -> Option<[f64; 4]>

#rgb, #rgba, #rrggbb, #rrggbbaa → [r, g, b, a] (a in 0..1).

resolve_relative

pub fn resolve_relative(current: &str, target: &str) -> String

Resolve a relative value ("+=40", "-=10px", "*=2") against the current value; other values are returned as they are.

shape

pub fn shape(s: &str) -> Shape

Split a value into literal text and numbers.