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use super::*;
#[derive(Clone)]
pub enum AssignType {
StaticLocal,
StaticGlobal,
Dynamic,
Update,
}
#[derive(Clone)]
pub struct Assign {
expr: Expr,
access: Access,
ty: AssignType,
}
impl Assign {
pub fn local<U, T>(var: &U, expr: T) -> Self
where
U: Into<Variable> + Clone,
T: Into<Expr>,
{
let var: Variable = var.clone().into();
Self {
expr: expr.into(),
access: var.into(),
ty: AssignType::StaticLocal,
}
}
pub fn global<U, T>(var: &U, expr: T) -> Self
where
U: Into<Variable> + Clone,
T: Into<Expr>,
{
let var: Variable = var.clone().into();
Self {
expr: expr.into(),
access: var.into(),
ty: AssignType::StaticGlobal,
}
}
pub fn set<U, T>(access: &U, expr: T) -> Self
where
U: Into<Access> + Clone,
T: Into<Expr>,
{
Self {
expr: expr.into(),
access: access.clone().into(),
ty: AssignType::Dynamic,
}
}
pub fn increment<T>(var: &T) -> Self
where
T: Into<Variable> + Clone,
{
let var: Variable = var.clone().into();
Self {
expr: Expr::add(var.clone(), 1),
access: var.into(),
ty: AssignType::Update,
}
}
pub fn decrement<T>(var: &T) -> Self
where
T: Into<Variable> + Clone,
{
let var: Variable = var.clone().into();
Self {
expr: Expr::sub(var.clone(), 1),
access: var.into(),
ty: AssignType::Update,
}
}
}
#[derive(Clone, Debug)]
pub struct Access {
pub keys: Vec<Expr>,
pub target: Variable,
}
impl Access {
pub fn new(target: Variable, keys: Vec<Expr>) -> Self {
Self { keys, target }
}
pub fn target(target: Variable) -> Self {
Self {
keys: vec![],
target,
}
}
pub fn at<T>(mut self, key: T) -> Self
where
T: Into<Expr>,
{
self.keys.push(key.into());
self
}
}
impl<T> From<T> for Access
where
T: std::borrow::Borrow<Variable>,
{
fn from(target: T) -> Self {
Self {
keys: vec![],
target: target.borrow().clone(),
}
}
}
impl From<Expr> for Access {
fn from(expr: Expr) -> Self {
match expr {
Expr::Access(access) => access,
Expr::Variable(var) => var.into(),
_ => unimplemented!(),
}
}
}
impl Assign {
fn lower_dynamic<'hir, 'lir>(&'hir self, runtime: &mut HirLoweringRuntime<'lir>)
where
'hir: 'lir,
{
let target = &self.access.target;
if runtime.has_local(target) {
runtime.emit(LirElement::push_dynamic(Scope::Local, target));
} else {
runtime.emit(LirElement::push_dynamic(Scope::Global, target));
}
let mut key_it = self.access.keys.iter().peekable();
if let Some(key) = key_it.next() {
key.lower(runtime);
runtime.emit(LirElement::RGet);
while key_it.peek().is_some() {
let key = key_it.next().unwrap();
key.lower(runtime);
runtime.emit(LirElement::RGet);
}
}
self.expr.lower(runtime);
runtime.emit(LirElement::Set);
}
fn lower_static<'hir, 'lir>(&'hir self, runtime: &mut HirLoweringRuntime<'lir>)
where
'hir: 'lir,
{
self.expr.lower(runtime);
let target = &self.access.target;
match self.ty {
AssignType::StaticLocal => {
runtime.emit(LirElement::store(Scope::Local, target));
}
AssignType::StaticGlobal => {
runtime.emit(LirElement::store(Scope::Global, target));
}
_ => unreachable!(),
}
}
fn lower_update<'hir, 'lir>(&'hir self, runtime: &mut HirLoweringRuntime<'lir>)
where
'hir: 'lir,
{
self.expr.lower(runtime);
let target = &self.access.target;
if runtime.has_local(&target) {
runtime.emit(LirElement::store(Scope::Local, target));
} else {
runtime.emit(LirElement::store(Scope::Global, target));
}
}
}
impl HirLowering for Assign {
fn lower<'hir, 'lir>(&'hir self, runtime: &mut HirLoweringRuntime<'lir>)
where
'hir: 'lir,
{
match &self.ty {
AssignType::StaticLocal | AssignType::StaticGlobal => self.lower_static(runtime),
AssignType::Dynamic => self.lower_dynamic(runtime),
AssignType::Update => self.lower_update(runtime),
}
}
}