Patrik Svensson
@patriksvensson.se
1.4K followers 494 following 2.3K posts
Father. Husband. Programmer. Likes OSS, compilers, programming. Spectre.Console, Cake. Ally ✊🏾🏳️🌈🏳️⚧️♀️(He/Him) @patriksvensson@mstdn.social Stockholm, Sweden
Father. Husband. Programmer. Likes OSS, compilers, programming. Spectre.Console, Cake. Ally ✊🏾🏳️🌈🏳️⚧️♀️(He/Him) @patriksvensson@mstdn.social Stockholm, Sweden
![#load "parsing/mod.mew"
use std;
let expression = read_expression();
let result = parsing.evaluate(expression);
match result {
.ok(value) => println($"The result is: {value}"),
.err(message) => panic(message),
}
fn read_expression() -> string {
let args = System.Environment::GetCommandLineArgs();
if args.count > 1 {
// Get the first provided value
return args[1];
} else {
// Get expression from stdin
print("> ");
return System.Console::ReadLine();
}
}](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:jeb6iqvlq7fzgwt6jxus4zdf/bafkreihc7m2gmahfq3o6ho275s453stwrvdndzhnnt4xswbku3yoyuh5eu)
![Mew source code:
```
pub interface Shape {
/// Gets the shape area
fn area() -> i32;
}
pub type Square {
pub field side: i32;
}
impl Shape for Square {
pub fn area() -> i32 {
return self.side * self.side;
}
}
pub type Box {
pub field width: i32;
pub field height: i32;
}
impl Shape for Box {
pub fn area() -> i32 {
return self.width * self.height;
}
}
fn test_interfaces() {
let shapes = new Shape[] {
new Square { side: 2, },
new Box { width: 3, height: 4, }
};
let mut total = 0;
let mut index = 0;
while index < shapes.count {
total += shapes[index].area();
index += 1;
}
println(itoa(total));
}
```](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:jeb6iqvlq7fzgwt6jxus4zdf/bafkreiegzocjyewgwbthxgekwb2yg57jzqrt6ahbyvhzpbna4vde7bftmu)
![var parts = passwordHash.Split('.');
if (parts is not [Version, _, _, _])
{
return false;
}](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:jeb6iqvlq7fzgwt6jxus4zdf/bafkreidv7yucgu62a4swhyngdq6h2byimgwvejqq2fl2f7pz34f6wn2yom)
![```
// Then
result.ShouldHaveDiagnostics(
"""
Error [MEW2071]: Duplicate case
┌─[]
│
1 │ pub union U { a, b(i32), a }
· ┬ ┬
· │ ╰── 'U' already declares a case named 'a'
· │
· ╰───────────── First declared here
│
└─
""");
```](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:jeb6iqvlq7fzgwt6jxus4zdf/bafkreidrtdujokv4b3jwgfzw7iwkh4dmmqfnlymheh2wm7omow6ss5qo7y)
