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use crate::prepare::{CallSignature, FunctionCallSignatures, ProgramParser};
use crate::{RigzBuilder, RigzType, UnaryOperation};
use rigz_ast::{Element, Expression, FunctionExpression, Scope, ValidationError};
use std::cmp::Ordering;
use std::collections::HashSet;
impl<'vm, T: RigzBuilder<'vm>> ProgramParser<'vm, T> {
fn scope_type(&mut self, scope: &Scope<'vm>) -> Result<RigzType, ValidationError> {
let e = scope.elements.last().expect("Invalid scope");
match e {
Element::Statement(_) => Ok(RigzType::None),
Element::Expression(e) => self.rigz_type(e),
}
}
pub(crate) fn rigz_type(
&mut self,
expression: &Expression<'vm>,
) -> Result<RigzType, ValidationError> {
// todo arguments should be checked for function calls here for best match
let t = match expression {
Expression::This => self.identifiers["self"].clone().rigz_type,
Expression::Value(v) => v.rigz_type(),
Expression::Error(_) => RigzType::Error,
Expression::Identifier(a) => match self.identifiers.get(a) {
None => {
self.check_module_exists(a)?;
match self.function_scopes.get(a) {
None => {
return Err(ValidationError::MissingExpression(format!(
"identifier {a} does not exist"
)))
}
Some(f) => match Self::function_call_return_type(a, f) {
Ok(v) => v,
Err(_) => {
return Err(ValidationError::MissingExpression(format!(
"{a} does not match existing functions"
)))
}
},
}
}
Some(v) => v.clone().rigz_type,
},
Expression::BinExp(lhs, _, rhs) => {
let rhs = self.rigz_type(rhs)?;
let lhs = self.rigz_type(lhs)?;
match lhs.partial_cmp(&rhs) {
None => RigzType::Any,
Some(ord) => match ord {
Ordering::Less => rhs,
Ordering::Equal => lhs,
Ordering::Greater => lhs,
},
}
}
Expression::UnaryExp(o, e) => match o {
UnaryOperation::Not => match self.rigz_type(e)? {
RigzType::Error => RigzType::Error,
_ => RigzType::Bool,
},
UnaryOperation::Neg | UnaryOperation::Reverse => self.rigz_type(e)?,
UnaryOperation::Print
| UnaryOperation::EPrint
| UnaryOperation::PrintLn
| UnaryOperation::EPrintLn => RigzType::None,
},
Expression::Cast(_, r) => r.clone(),
Expression::Scope(s) => self.scope_type(s)?,
Expression::Function(fe) => self.function_type(fe)?,
Expression::Symbol(_) => RigzType::String,
Expression::If { then, branch, .. } => match branch {
None => self.scope_type(then)?,
Some(branch) => {
let then = self.scope_type(then)?;
let branch = self.scope_type(branch)?;
if then == branch {
then
} else {
RigzType::Composite(vec![then, branch])
}
}
},
Expression::Unless { then, .. } => self.scope_type(then)?,
Expression::Return(e) => match e {
None => RigzType::None,
Some(e) => self.rigz_type(e)?,
},
Expression::Lambda { body, .. } => self.rigz_type(body)?,
Expression::ForList { body, .. } => RigzType::List(self.rigz_type(body)?.into()),
Expression::ForMap { key, value, .. } => match value {
None => {
let key = self.rigz_type(key)?;
let value = match &key {
RigzType::Tuple(t) => t[1].clone(),
_ => {
return Err(ValidationError::MissingExpression(format!(
"Invalid key in for-map expression {key}"
)))
}
};
RigzType::Map(Box::new(key), value.into())
}
Some(value) => {
RigzType::Map(self.rigz_type(key)?.into(), self.rigz_type(value)?.into())
}
},
Expression::Tuple(e) => {
let mut result = Vec::with_capacity(e.len());
for ex in e {
result.push(self.rigz_type(ex)?);
}
RigzType::Tuple(result)
}
// todo more accurate typing
Expression::List(_) => RigzType::List(Box::new(RigzType::Any)),
Expression::Map(_) => RigzType::Map(Box::new(RigzType::Any), Box::new(RigzType::Any)),
Expression::Index(base, _index) => {
let base = self.rigz_type(base)?;
// todo confirm index can be used
match base {
RigzType::None | RigzType::Bool | RigzType::Error => RigzType::Error,
RigzType::Any => RigzType::Any,
RigzType::Int | RigzType::Float | RigzType::Number => RigzType::Bool,
RigzType::String => RigzType::String,
RigzType::List(l) | RigzType::Map(_, l) => *l,
RigzType::Type => RigzType::Error,
_ => todo!(),
// todo need to know whether int range, char range, or dynamic
/*
RigzType::Range => RigzType::Any,
RigzType::Function(_, _) => {}
RigzType::This => {
// todo improve this logic, move most of this to a function
match self.identifiers.get("self") {
None => RigzType::This,
Some(v) => v.rigz_type.clone(),
}
}
RigzType::Tuple(_) => {}
RigzType::Union(_) => {}
RigzType::Composite(_) => {}
RigzType::Custom(_) => {}
*/
}
}
Expression::Into { next, .. } => {
// todo check base arg
self.function_type(next)?
}
};
Ok(t)
}
fn function_type(&mut self, fe: &FunctionExpression<'vm>) -> Result<RigzType, ValidationError> {
let e = match fe {
FunctionExpression::FunctionCall(name, _) => {
if matches!(*name, "puts" | "log" | "sleep") {
return Ok(RigzType::None);
}
if matches!(*name, "send" | "spawn") {
return Ok(RigzType::Int);
}
if name == &"broadcast" {
return Ok(RigzType::List(RigzType::Int.into()));
}
if name == &"receive" {
return Ok(RigzType::Any);
}
self.check_module_exists(name)?;
match self.function_scopes.get(name) {
None => {
return Err(ValidationError::InvalidFunction(format!(
"function {name} does not exist"
)))
}
Some(f) => Self::function_call_return_type(name, f)?,
}
}
FunctionExpression::TypeFunctionCall(r, name, _) => {
self.check_module_exists(name)?;
match self.function_scopes.get(name) {
None => {
return Err(ValidationError::InvalidFunction(format!(
"typed extension function {r}.{name} does not exist"
)))
}
Some(f) => {
// todo ignore extension functions here
if f.len() > 1 {
// todo support union types
let matched: HashSet<_> = f
.iter()
.filter_map(|cs| match cs {
CallSignature::Function(f, _) => match &f.self_type {
None => None,
Some(ft) => {
if &ft.rigz_type == r {
Some(f.return_type.rigz_type.clone())
} else {
None
}
}
},
CallSignature::Lambda(_, _, ret) => Some(ret.clone()),
})
.collect();
match matched.len() {
0 => {
return Err(ValidationError::InvalidFunction(format!(
"typed extension function {r}.{name} does not exist"
)))
}
1 => matched.iter().next().cloned().unwrap(),
_ => r.clone(),
}
} else {
f[0].rigz_type()
}
}
}
}
FunctionExpression::InstanceFunctionCall(ex, calls, _) => {
let this = self.rigz_type(ex)?;
let this = match this {
RigzType::This => match self.identifiers.get("self") {
None => RigzType::This,
Some(v) => v.rigz_type.clone(),
},
_ => this,
};
let name = calls.last().expect("Invalid instance function call");
// todo need to handle call chaining
self.check_module_exists(name)?;
match self.function_scopes.get(name) {
None => {
return Err(ValidationError::InvalidFunction(format!(
"extension function {this}.{name} does not exist",
)))
}
Some(f) => {
// todo ignore extension functions here
if f.len() > 1 {
// todo support union types
let matched: HashSet<_> = f
.iter()
.filter_map(|cs| match cs {
CallSignature::Function(f, _) => f
.self_type
.as_ref()
.filter(|t| t.rigz_type == this)
.map(|_| f.return_type.rigz_type.clone()),
CallSignature::Lambda(_, _, ret) => Some(ret.clone()),
})
.collect();
match matched.len() {
0 => {
return Err(ValidationError::InvalidFunction(format!(
"extension {name} does not exist"
)))
}
1 => matched.iter().next().cloned().unwrap(),
_ => {
dbg!(f);
this
}
}
} else {
f[0].rigz_type()
}
}
}
}
};
Ok(e)
}
fn function_call_return_type(
name: &&str,
f: &FunctionCallSignatures,
) -> Result<RigzType, ValidationError> {
let matched: HashSet<_> = f
.iter()
.filter_map(|cs| match cs {
CallSignature::Function(f, _) => match &f.self_type {
None => Some(f.return_type.rigz_type.clone()),
Some(_) => None,
},
CallSignature::Lambda(_, _, ret) => Some(ret.clone()),
})
.collect();
Ok(match matched.len() {
0 => {
return Err(ValidationError::InvalidFunction(format!(
"function {name} does not exist"
)))
}
1 => matched.iter().next().cloned().unwrap(),
_ => RigzType::Any,
})
}
}