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use crate::{AsgConvertError, ConstValue, Expression, ExpressionNode, FromAst, Node, PartialType, Scope, Span, Type};
pub use leo_ast::UnaryOperation;
use std::{
cell::RefCell,
sync::{Arc, Weak},
};
pub struct UnaryExpression {
pub parent: RefCell<Option<Weak<Expression>>>,
pub span: Option<Span>,
pub operation: UnaryOperation,
pub inner: Arc<Expression>,
}
impl Node for UnaryExpression {
fn span(&self) -> Option<&Span> {
self.span.as_ref()
}
}
impl ExpressionNode for UnaryExpression {
fn set_parent(&self, parent: Weak<Expression>) {
self.parent.replace(Some(parent));
}
fn get_parent(&self) -> Option<Arc<Expression>> {
self.parent.borrow().as_ref().map(Weak::upgrade).flatten()
}
fn enforce_parents(&self, expr: &Arc<Expression>) {
self.inner.set_parent(Arc::downgrade(expr));
}
fn get_type(&self) -> Option<Type> {
self.inner.get_type()
}
fn is_mut_ref(&self) -> bool {
false
}
fn const_value(&self) -> Option<ConstValue> {
if let Some(inner) = self.inner.const_value() {
match self.operation {
UnaryOperation::Not => match inner {
ConstValue::Boolean(value) => Some(ConstValue::Boolean(!value)),
_ => None,
},
UnaryOperation::Negate => {
match inner {
ConstValue::Int(value) => Some(ConstValue::Int(value.value_negate()?)),
_ => None,
}
}
}
} else {
None
}
}
fn is_consty(&self) -> bool {
self.inner.is_consty()
}
}
impl FromAst<leo_ast::UnaryExpression> for UnaryExpression {
fn from_ast(
scope: &Scope,
value: &leo_ast::UnaryExpression,
expected_type: Option<PartialType>,
) -> Result<UnaryExpression, AsgConvertError> {
let expected_type = match value.op {
UnaryOperation::Not => match expected_type.map(|x| x.full()).flatten() {
Some(Type::Boolean) | None => Some(Type::Boolean),
Some(type_) => {
return Err(AsgConvertError::unexpected_type(
&type_.to_string(),
Some(&*Type::Boolean.to_string()),
&value.span,
));
}
},
UnaryOperation::Negate => match expected_type.map(|x| x.full()).flatten() {
Some(type_ @ Type::Integer(_)) => Some(type_),
Some(Type::Group) => Some(Type::Group),
Some(Type::Field) => Some(Type::Field),
None => None,
Some(type_) => {
return Err(AsgConvertError::unexpected_type(
&type_.to_string(),
Some("integer, group, field"),
&value.span,
));
}
},
};
Ok(UnaryExpression {
parent: RefCell::new(None),
span: Some(value.span.clone()),
operation: value.op.clone(),
inner: Arc::<Expression>::from_ast(scope, &*value.inner, expected_type.map(Into::into))?,
})
}
}
impl Into<leo_ast::UnaryExpression> for &UnaryExpression {
fn into(self) -> leo_ast::UnaryExpression {
leo_ast::UnaryExpression {
op: self.operation.clone(),
inner: Box::new(self.inner.as_ref().into()),
span: self.span.clone().unwrap_or_default(),
}
}
}