WIP: image processing library (or libraries?) #12

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schrottkatze wants to merge 15 commits from schrottkatze/iowo:proc-libs into main
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@ -2,3 +2,79 @@
//! //!
//! One of the design goals for this library is, however, to be a simple, generic image processing library. //! One of the design goals for this library is, however, to be a simple, generic image processing library.
//! For now, it's just indev... lets see what comes of it! //! For now, it's just indev... lets see what comes of it!
use experimental::enum_based::{Instruction, PipelineBuilder};
/// just some experiments, to test whether the architecture i want is even possible (or how to do it). probably temporary.
/// Gonna first try string processing...
mod experimental {
pub mod enum_based {
pub enum Instruction {
Uppercase,
Lowercase,
}
pub struct Pipeline {
pipeline: Vec<fn(String) -> String>,
}
impl Pipeline {
pub fn run(&self, val: String) -> String {
let mut current = val;
for instr in &self.pipeline {
current = instr(current);
}
current
}
}
pub struct PipelineBuilder {
pipeline: Vec<Instruction>,
}
impl PipelineBuilder {
pub fn new() -> Self {
Self {
pipeline: Vec::new(),
}
}
pub fn insert(mut self, instr: Instruction) -> Self {
self.pipeline.push(instr);
self
}
pub fn build(&self) -> Pipeline {
fn uppercase(v: String) -> String {
str::to_uppercase(&v)
}
fn lowercase(v: String) -> String {
str::to_lowercase(&v)
}
let mut res = Vec::new();
for item in &self.pipeline {
res.push(match item {
Instruction::Uppercase => uppercase,
Instruction::Lowercase => lowercase,
});
}
Pipeline { pipeline: res }
}
}
}
}
#[test]
fn test_enums() {
let builder = PipelineBuilder::new().insert(Instruction::Uppercase);
let upr = builder.build();
let upr_lowr = builder.insert(Instruction::Lowercase).build();
assert_eq!(upr.run(String::from("Test")), String::from("TEST"));
assert_eq!(upr_lowr.run(String::from("Test")), String::from("test"));
}