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infer infra

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This commit is contained in:
greg 2018-05-18 01:43:51 -07:00
parent 734c53ce0d
commit 843d895f2b
1 changed files with 22 additions and 3 deletions
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25
schala-lang/src/typechecking.rs
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@ -283,6 +283,8 @@ enum InferError {
UnknownIdentifier(Rc<String>)
}
type InferResult<T> = Result<T, InferError>;
impl Infer {
fn fresh(&mut self) -> MonoType {
let i = self._idents;
@ -291,7 +293,7 @@ impl Infer {
MonoType::Var(name)
}
fn unify(&mut self, a: MonoType, b: MonoType) -> Result<Substitution, InferError> {
fn unify(&mut self, a: MonoType, b: MonoType) -> InferResult<Substitution> {
use self::InferError::*; use self::MonoType::*;
Ok(match (a, b) {
(Const(ref a), Const(ref b)) if a == b => Substitution::new(),
@ -306,7 +308,7 @@ impl Infer {
})
}
fn infer_block(&mut self, block: &Vec<parsing::Statement>, env: &TypeEnvironment) -> Result<MonoType, InferError> {
fn infer_block(&mut self, block: &Vec<parsing::Statement>, env: &TypeEnvironment) -> InferResult<MonoType> {
use self::parsing::Statement;
let mut ret = MonoType::Const(TypeConst::Unit);
for statement in block.iter() {
@ -323,7 +325,24 @@ impl Infer {
Ok(ret)
}
fn infer_expr(&mut self, expr: &parsing::Expression, env: &TypeEnvironment) -> Result<(Substitution, MonoType), InferError> {
fn infer_expr(&mut self, expr: &parsing::Expression, env: &TypeEnvironment) -> InferResult<(Substitution, MonoType)> {
use self::parsing::Expression;
match expr {
Expression(e, Some(anno)) => self.infer_annotated_expr(e, anno, env),
/*
let anno_ty = anno.to_type()?;
let ty = self.infer_exprtype(&e)?;
self.unify(ty, anno_ty)
},
*/
Expression(e, None) => self.infer_exprtype(e, env)
}
}
fn infer_exprtype(&mut self, expr: &parsing::ExpressionType, env: &TypeEnvironment) -> InferResult<(Substitution, MonoType)> {
unimplemented!()
}
fn infer_annotated_expr(&mut self, expr: &parsing::ExpressionType, anno: &parsing::TypeName, env: &TypeEnvironment) -> InferResult<(Substitution, MonoType)> {
unimplemented!()
}
}