schala/schala-lang/src/builtin.rs
2018-07-26 00:52:46 -07:00

101 lines
3.0 KiB
Rust

use std::rc::Rc;
use std::collections::HashMap;
use std::fmt;
use self::Type::*; use self::TConstOld::*;
//TODO get rid of these types and replace them with the right MonoType or whatever ones later
#[derive(Debug, PartialEq, Clone)]
pub enum Type {
Const(TConstOld),
Func(Box<Type>, Box<Type>),
}
#[derive(Debug, PartialEq, Clone)]
pub enum TConstOld {
Nat,
Int,
Float,
StringT,
Bool,
}
impl fmt::Display for Type {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{:?}", self)
}
}
#[derive(Debug, PartialEq, Clone)]
pub struct BinOp {
sigil: Rc<String>
}
impl BinOp {
pub fn from_sigil(sigil: &str) -> BinOp {
BinOp { sigil: Rc::new(sigil.to_string()) }
}
pub fn sigil(&self) -> &Rc<String> {
&self.sigil
}
pub fn get_type(&self) -> Result<Type, String> {
let s = self.sigil.as_str();
BINOPS.get(s).map(|x| x.0.clone()).ok_or(format!("Binop {} not found", s))
}
pub fn min_precedence() -> i32 {
i32::min_value()
}
pub fn get_precedence(op: &str) -> i32 {
let default = 10_000_000;
BINOPS.get(op).map(|x| x.2.clone()).unwrap_or(default)
}
}
#[derive(Debug, PartialEq, Clone)]
pub struct PrefixOp {
sigil: Rc<String>
}
impl PrefixOp {
pub fn from_sigil(sigil: &str) -> PrefixOp {
PrefixOp { sigil: Rc::new(sigil.to_string()) }
}
pub fn sigil(&self) -> &Rc<String> {
&self.sigil
}
pub fn is_prefix(op: &str) -> bool {
PREFIX_OPS.get(op).is_some()
}
pub fn get_type(&self) -> Result<Type, String> {
let s = self.sigil.as_str();
PREFIX_OPS.get(s).map(|x| x.0.clone()).ok_or(format!("Prefix op {} not found", s))
}
}
lazy_static! {
static ref PREFIX_OPS: HashMap<&'static str, (Type, ())> =
hashmap! {
"+" => (Func(bx!(Const(Int)), bx!(Const(Int))), ()),
"-" => (Func(bx!(Const(Int)), bx!(Const(Int))), ()),
"!" => (Func(bx!(Const(Bool)), bx!(Const(Bool))), ()),
};
}
/* the second tuple member is a placeholder for when I want to make evaluation rules tied to the
* binop definition */
lazy_static! {
static ref BINOPS: HashMap<&'static str, (Type, (), i32)> =
hashmap! {
"+" => (Func(bx!(Const(Nat)), bx!(Func(bx!(Const(Nat)), bx!(Const(Nat))))), (), 10),
"-" => (Func(bx!(Const(Nat)), bx!(Func(bx!(Const(Nat)), bx!(Const(Nat))))), (), 10),
"*" => (Func(bx!(Const(Nat)), bx!(Func(bx!(Const(Nat)), bx!(Const(Nat))))), (), 20),
"/" => (Func(bx!(Const(Nat)), bx!(Func(bx!(Const(Nat)), bx!(Const(Float))))), (), 20),
"//" => (Func(bx!(Const(Nat)), bx!(Func(bx!(Const(Nat)), bx!(Const(Nat))))), (), 20), //TODO change this to `quot`
"%" => (Func(bx!(Const(Nat)), bx!(Func(bx!(Const(Nat)), bx!(Const(Nat))))), (), 20),
"++" => (Func(bx!(Const(StringT)), bx!(Func(bx!(Const(StringT)), bx!(Const(StringT))))), (), 30),
"^" => (Func(bx!(Const(Nat)), bx!(Func(bx!(Const(Nat)), bx!(Const(Nat))))), (), 20),
"&" => (Func(bx!(Const(Nat)), bx!(Func(bx!(Const(Nat)), bx!(Const(Nat))))), (), 20),
"|" => (Func(bx!(Const(Nat)), bx!(Func(bx!(Const(Nat)), bx!(Const(Nat))))), (), 20),
};
}