73 lines
1.6 KiB
Rust
73 lines
1.6 KiB
Rust
use crate::{
|
|
context::Context,
|
|
error::{RuntimeError, ValidationError},
|
|
};
|
|
|
|
use super::{AbstractTree, Action, Statement, Type};
|
|
|
|
#[derive(Clone, Debug, Eq, PartialEq, PartialOrd, Ord)]
|
|
pub struct Loop<'src> {
|
|
statements: Vec<Statement<'src>>,
|
|
}
|
|
|
|
impl<'src> Loop<'src> {
|
|
pub fn new(statements: Vec<Statement<'src>>) -> Self {
|
|
Self { statements }
|
|
}
|
|
}
|
|
|
|
impl<'src> AbstractTree for Loop<'src> {
|
|
fn expected_type(&self, _context: &Context) -> Result<Type, ValidationError> {
|
|
Ok(Type::None)
|
|
}
|
|
|
|
fn validate(&self, _context: &Context) -> Result<(), ValidationError> {
|
|
for statement in &self.statements {
|
|
statement.validate(_context)?;
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
fn run(self, _context: &Context) -> Result<Action, RuntimeError> {
|
|
let mut index = 0;
|
|
|
|
loop {
|
|
if index == self.statements.len() - 1 {
|
|
index = 0;
|
|
} else {
|
|
index += 1;
|
|
}
|
|
|
|
let statement = self.statements[index].clone();
|
|
let action = statement.run(_context)?;
|
|
|
|
match action {
|
|
Action::Return(_) => {}
|
|
Action::None => {}
|
|
r#break => return Ok(r#break),
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use crate::{
|
|
abstract_tree::{Expression, ValueNode},
|
|
Value,
|
|
};
|
|
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn basic_loop() {
|
|
let result = Loop {
|
|
statements: vec![Statement::Break(Expression::Value(ValueNode::Integer(42)))],
|
|
}
|
|
.run(&Context::new());
|
|
|
|
assert_eq!(result, Ok(Action::Break(Value::integer(42))))
|
|
}
|
|
}
|