schala/schala-lang/language/src/builtin.rs

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use std::rc::Rc;
use std::collections::HashMap;
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use crate::tokenizing::TokenKind;
use crate::typechecking::{TypeConst, Type};
use crate::typechecking::TypeConst::*;
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#[derive(Debug, PartialEq, Clone)]
pub struct BinOp {
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sigil: Rc<String>
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}
impl BinOp {
pub fn from_sigil(sigil: &str) -> BinOp {
BinOp { sigil: Rc::new(sigil.to_string()) }
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}
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pub fn sigil(&self) -> &Rc<String> {
&self.sigil
}
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pub fn from_sigil_token(tok: &TokenKind) -> Option<BinOp> {
use self::TokenKind::*;
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let s = match tok {
Operator(op) => op,
Period => ".",
Pipe => "|",
Slash => "/",
LAngleBracket => "<",
RAngleBracket => ">",
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_ => return None
};
Some(BinOp::from_sigil(s))
}
/*
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))
}
*/
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pub fn min_precedence() -> i32 {
i32::min_value()
}
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pub fn get_precedence_from_token(op: &TokenKind) -> Option<i32> {
use self::TokenKind::*;
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let s = match op {
Operator(op) => op,
Period => ".",
Pipe => "|",
Slash => "/",
LAngleBracket => "<",
RAngleBracket => ">",
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_ => return None
};
let default = 10_000_000;
Some(BINOPS.get(s).map(|x| x.2.clone()).unwrap_or_else(|| {
default
}))
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}
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pub fn get_precedence(&self) -> i32 {
let s: &str = &self.sigil;
let default = 10_000_000;
BINOPS.get(s).map(|x| x.2.clone()).unwrap_or_else(|| {
default
})
}
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}
#[derive(Debug, PartialEq, Clone)]
pub struct PrefixOp {
sigil: Rc<String>
}
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impl PrefixOp {
pub fn from_sigil(sigil: &str) -> PrefixOp {
PrefixOp { sigil: Rc::new(sigil.to_string()) }
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}
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pub fn sigil(&self) -> &Rc<String> {
&self.sigil
}
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pub fn is_prefix(op: &str) -> bool {
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PREFIX_OPS.get(op).is_some()
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}
/*
pub fn get_type(&self) -> Result<Type, String> {
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let s = self.sigil.as_str();
PREFIX_OPS.get(s).map(|x| x.0.clone()).ok_or(format!("Prefix op {} not found", s))
}
*/
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}
//TODO make this macro exportable?
macro_rules! mk_type {
($type_name:ident) => { Type::Const(TypeConst::$type_name) };
($t1:ident -> $t2:ident) => { Type::Arrow(Box::new(mk_type!($t1)), Box::new(mk_type!($t2))) };
($t1:ident -> $t2:ident -> $t3:ident) => { Type::Arrow(Box::new(mk_type!($t1)), Box::new(mk_type!($t2 -> $t3))) };
}
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lazy_static! {
static ref PREFIX_OPS: HashMap<&'static str, (Type, ())> =
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hashmap! {
"+" => (mk_type!(Int -> Int), ()),
"-" => (mk_type!(Int -> Int), ()),
"!" => (mk_type!(Bool -> Bool), ()),
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};
}
/* the second tuple member is a placeholder for when I want to make evaluation rules tied to the
* binop definition */
//TODO some of these types are going to have to be adjusted
lazy_static! {
static ref BINOPS: HashMap<&'static str, (Type, (), i32)> =
hashmap! {
"+" => (mk_type!(Nat -> Nat -> Nat), (), 10),
"-" => (mk_type!(Nat -> Nat -> Nat), (), 10),
"*" => (mk_type!(Nat -> Nat -> Nat), (), 20),
"/" => (mk_type!(Nat -> Nat -> Float), (), 20),
"quot" => (mk_type!(Nat -> Nat -> Nat), (), 20),
"%" => (mk_type!(Nat -> Nat -> Nat), (), 20),
"++" => (mk_type!(StringT -> StringT -> StringT), (), 30),
"^" => (mk_type!(Nat -> Nat -> Nat), (), 20),
"&" => (mk_type!(Nat -> Nat -> Nat), (), 20),
"|" => (mk_type!(Nat -> Nat -> Nat), (), 20),
">" => (mk_type!(Nat -> Nat -> Bool), (), 20),
">=" => (mk_type!(Nat -> Nat -> Bool), (), 20),
"<" => (mk_type!(Nat -> Nat -> Bool), (), 20),
"<=" => (mk_type!(Nat -> Nat -> Bool), (), 20),
"==" => (mk_type!(Nat -> Nat -> Bool), (), 20),
"=" => (mk_type!(Unit), (), 20), //TODO not sure what the type of this should be b/c special fmr
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"<=>" => (mk_type!(Nat -> Nat -> Ordering), (), 20), //TODO figure out how to treat Order
};
}