98 lines
2.5 KiB
Rust
98 lines
2.5 KiB
Rust
use crate::{
|
|
context::Context,
|
|
error::{RuntimeError, ValidationError},
|
|
};
|
|
|
|
use super::{AbstractNode, Action, Statement, Type};
|
|
|
|
#[derive(Clone, Debug, Eq, PartialEq, PartialOrd, Ord)]
|
|
pub struct Block {
|
|
statements: Vec<Statement>,
|
|
}
|
|
|
|
impl Block {
|
|
pub fn new(statements: Vec<Statement>) -> Self {
|
|
Self { statements }
|
|
}
|
|
|
|
pub fn last_statement(&self) -> &Statement {
|
|
self.statements.last().unwrap()
|
|
}
|
|
}
|
|
|
|
impl AbstractNode for Block {
|
|
fn expected_type(&self, _context: &mut Context) -> Result<Type, ValidationError> {
|
|
if let Some(statement) = self.statements.last() {
|
|
statement.expected_type(_context)
|
|
} else {
|
|
Ok(Type::None)
|
|
}
|
|
}
|
|
|
|
fn validate(
|
|
&self,
|
|
_context: &mut Context,
|
|
_manage_memory: bool,
|
|
) -> Result<(), ValidationError> {
|
|
for statement in &self.statements {
|
|
statement.validate(_context, _manage_memory)?;
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
fn run(self, _context: &mut Context, _manage_memory: bool) -> Result<Action, RuntimeError> {
|
|
let mut previous = Action::None;
|
|
|
|
for statement in self.statements {
|
|
previous = statement.run(_context, _manage_memory)?;
|
|
}
|
|
|
|
Ok(previous)
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use crate::{
|
|
abstract_tree::{Expression, ValueNode, WithPos},
|
|
Value,
|
|
};
|
|
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn run_returns_value_of_final_statement() {
|
|
let block = Block::new(vec![
|
|
Statement::Expression(Expression::Value(
|
|
ValueNode::Integer(1).with_position((0, 0)),
|
|
)),
|
|
Statement::Expression(Expression::Value(
|
|
ValueNode::Integer(2).with_position((0, 0)),
|
|
)),
|
|
Statement::Expression(Expression::Value(
|
|
ValueNode::Integer(42).with_position((0, 0)),
|
|
)),
|
|
]);
|
|
|
|
assert_eq!(
|
|
block.run(&mut Context::new(), true).unwrap(),
|
|
Action::Return(Value::integer(42))
|
|
)
|
|
}
|
|
|
|
#[test]
|
|
fn expected_type_returns_type_of_final_statement() {
|
|
let block = Block::new(vec![
|
|
Statement::Expression(Expression::Value(
|
|
ValueNode::String("42".to_string()).with_position((0, 0)),
|
|
)),
|
|
Statement::Expression(Expression::Value(
|
|
ValueNode::Integer(42).with_position((0, 0)),
|
|
)),
|
|
]);
|
|
|
|
assert_eq!(block.expected_type(&mut Context::new()), Ok(Type::Integer))
|
|
}
|
|
}
|