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