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use ::ast::{self, WithLocation};
use super::environment;
use super::types::Ty;
#[derive(Debug)]
pub enum TypeError {
Unimplemented,
}
type TypeEnvironment<'a> = environment::Environment<'a, String, Ty>;
pub type Result = ::std::result::Result<Ty, WithLocation<TypeError>>;
pub fn translate(program: &ast::Program) -> Result {
trans_exp(TypeEnvironment::new(None), &*program.0)
}
fn trans_exp<'a>(venv: TypeEnvironment<'a>, exp: &WithLocation<ast::Expression>) -> Result {
use ast::Expression::*;
match &exp.value {
&Let(ref decls, ref body) => {
Err(WithLocation::new(TypeError::Unimplemented, exp.start, exp.end))
},
&UnaryOp(ref op, ref operand) => {
Err(WithLocation::new(TypeError::Unimplemented, exp.start, exp.end))
},
&BinOp(ref op, ref left, ref right) => {
Err(WithLocation::new(TypeError::Unimplemented, exp.start, exp.end))
},
&Number(_) => Ok(Ty::Int),
&String(_) => Ok(Ty::String),
&Name(ref name) => {
Err(WithLocation::new(TypeError::Unimplemented, exp.start, exp.end))
},
&Nil => {
Err(WithLocation::new(TypeError::Unimplemented, exp.start, exp.end))
},
}
}
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