forked from M-Labs/nac3
1
0
Fork 0
nac3/nac3core/src/symbol_resolver.rs

189 lines
7.3 KiB
Rust
Raw Normal View History

2021-08-11 17:28:29 +08:00
use std::collections::HashMap;
2021-08-23 11:13:45 +08:00
use std::{cell::RefCell, sync::Arc};
2021-08-11 17:28:29 +08:00
use crate::top_level::{DefinitionId, TopLevelDef};
2021-08-11 17:28:29 +08:00
use crate::typecheck::{
type_inferencer::PrimitiveStore,
typedef::{Type, Unifier},
};
use crate::{location::Location, typecheck::typedef::TypeEnum};
use itertools::{chain, izip};
use parking_lot::RwLock;
2021-07-20 16:13:43 +08:00
use rustpython_parser::ast::Expr;
2021-06-28 14:48:04 +08:00
2021-08-07 17:25:14 +08:00
#[derive(Clone, PartialEq)]
pub enum SymbolValue {
2021-06-28 14:48:04 +08:00
I32(i32),
I64(i64),
Double(f64),
Bool(bool),
2021-08-07 17:25:14 +08:00
Tuple(Vec<SymbolValue>),
// we should think about how to implement bytes later...
// Bytes(&'a [u8]),
2021-06-28 14:48:04 +08:00
}
pub trait SymbolResolver {
// get type of type variable identifier or top-level function type
2021-08-11 17:28:29 +08:00
fn get_symbol_type(
&self,
unifier: &mut Unifier,
primitives: &PrimitiveStore,
str: &str,
) -> Option<Type>;
// get the top-level definition of identifiers
fn get_identifier_def(&self, str: &str) -> Option<DefinitionId>;
fn get_symbol_value(&self, str: &str) -> Option<SymbolValue>;
fn get_symbol_location(&self, str: &str) -> Option<Location>;
2021-08-11 17:28:29 +08:00
// handle function call etc.
}
// convert type annotation into type
pub fn parse_type_annotation<T>(
resolver: &dyn SymbolResolver,
top_level_defs: &[Arc<RwLock<TopLevelDef>>],
unifier: &mut Unifier,
primitives: &PrimitiveStore,
expr: &Expr<T>,
) -> Result<Type, String> {
use rustpython_parser::ast::ExprKind::*;
match &expr.node {
Name { id, .. } => match id.as_str() {
"int32" => Ok(primitives.int32),
"int64" => Ok(primitives.int64),
"float" => Ok(primitives.float),
"bool" => Ok(primitives.bool),
"None" => Ok(primitives.none),
x => {
let obj_id = resolver.get_identifier_def(x);
if let Some(obj_id) = obj_id {
let def = top_level_defs[obj_id.0].read();
if let TopLevelDef::Class { fields, methods, type_vars, .. } = &*def {
if !type_vars.is_empty() {
return Err(format!(
"Unexpected number of type parameters: expected {} but got 0",
type_vars.len()
));
2021-08-11 17:28:29 +08:00
}
let fields = RefCell::new(
chain(
fields.iter().map(|(k, v)| (k.clone(), *v)),
methods.iter().map(|(k, v, _)| (k.clone(), *v)),
)
.collect(),
);
Ok(unifier.add_ty(TypeEnum::TObj {
obj_id,
fields,
params: Default::default(),
}))
2021-08-11 17:28:29 +08:00
} else {
Err("Cannot use function name as type".into())
}
} else {
// it could be a type variable
let ty = resolver
.get_symbol_type(unifier, primitives, x)
2021-08-23 02:52:54 +08:00
.ok_or_else(|| "unknown type variable name".to_owned())?;
if let TypeEnum::TVar { .. } = &*unifier.get_ty(ty) {
Ok(ty)
} else {
Err(format!("Unknown type annotation {}", x))
2021-08-11 17:28:29 +08:00
}
}
}
},
Subscript { value, slice, .. } => {
if let Name { id, .. } = &value.node {
if id == "virtual" {
2021-08-23 11:13:45 +08:00
let ty = parse_type_annotation(
resolver,
top_level_defs,
unifier,
primitives,
slice,
)?;
Ok(unifier.add_ty(TypeEnum::TVirtual { ty }))
} else {
let types = if let Tuple { elts, .. } = &slice.node {
elts.iter()
2021-08-12 16:36:23 +08:00
.map(|v| {
2021-08-23 11:13:45 +08:00
parse_type_annotation(
resolver,
top_level_defs,
unifier,
primitives,
v,
)
2021-08-12 16:36:23 +08:00
})
.collect::<Result<Vec<_>, _>>()?
2021-08-11 17:28:29 +08:00
} else {
2021-08-12 16:36:23 +08:00
vec![parse_type_annotation(
2021-08-23 11:13:45 +08:00
resolver,
top_level_defs,
unifier,
primitives,
slice,
2021-08-12 16:36:23 +08:00
)?]
};
2021-08-11 17:28:29 +08:00
let obj_id = resolver
.get_identifier_def(id)
.ok_or_else(|| format!("Unknown type annotation {}", id))?;
let def = top_level_defs[obj_id.0].read();
if let TopLevelDef::Class { fields, methods, type_vars, .. } = &*def {
if types.len() != type_vars.len() {
return Err(format!(
"Unexpected number of type parameters: expected {} but got {}",
type_vars.len(),
types.len()
));
}
let mut subst = HashMap::new();
for (var, ty) in izip!(type_vars.iter(), types.iter()) {
let id = if let TypeEnum::TVar { id, .. } = &*unifier.get_ty(var.1) {
*id
} else {
unreachable!()
};
subst.insert(id, *ty);
}
let mut fields = fields
.iter()
.map(|(attr, ty)| {
2021-08-11 17:28:29 +08:00
let ty = unifier.subst(*ty, &subst).unwrap_or(*ty);
(attr.clone(), ty)
})
.collect::<HashMap<_, _>>();
fields.extend(methods.iter().map(|(attr, ty, _)| {
let ty = unifier.subst(*ty, &subst).unwrap_or(*ty);
(attr.clone(), ty)
}));
Ok(unifier.add_ty(TypeEnum::TObj {
obj_id,
fields: fields.into(),
params: subst.into(),
}))
} else {
Err("Cannot use function name as type".into())
2021-08-11 17:28:29 +08:00
}
}
} else {
Err("unsupported type expression".into())
2021-08-11 17:28:29 +08:00
}
}
_ => Err("unsupported type expression".into()),
}
}
2021-08-13 13:33:59 +08:00
impl dyn SymbolResolver + Send + Sync {
pub fn parse_type_annotation<T>(
&self,
top_level_defs: &[Arc<RwLock<TopLevelDef>>],
unifier: &mut Unifier,
primitives: &PrimitiveStore,
expr: &Expr<T>,
) -> Result<Type, String> {
parse_type_annotation(self, top_level_defs, unifier, primitives, expr)
2021-08-11 17:28:29 +08:00
}
2021-06-28 14:48:04 +08:00
}