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use super::{namespace::*, scope::*, *};
use crate::ast;
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct SimpleType(pub ast::SimpleType);
impl Legalize for SimpleType {
type Input = ast::SimpleType;
fn legalize(
_ns: &Namespace,
_ss: &Constraints,
_scope: &Scope,
input: &Self::Input,
) -> Result<Self, SemanticError> {
Ok(SimpleType(*input))
}
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct Bound {}
impl Legalize for Bound {
type Input = ast::Bound;
fn legalize(
_ns: &Namespace,
_ss: &Constraints,
_scope: &Scope,
_input: &Self::Input,
) -> Result<Self, SemanticError> {
// FIXME
Ok(Bound {})
}
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum TypeRef {
SimpleType(SimpleType),
Named {
name: String,
/// Scope where the named type is declared
scope: Scope,
/// True if the underlying type of named type is a simple type:
///
/// ```text
/// TYPE a = INTEGER; ENDTYPE;
/// TYPE b = a; ENDTYPE;
/// ```
///
/// Then both `a` and `b` are simple.
///
is_simple: bool,
/// Enumeration, declared by `TYPE a = ENUMERATION OF (..); END_TYPE;`.
is_enumerate: bool,
},
/* Declared as `ENTITY` */
Entity {
name: String,
scope: Scope,
is_supertype: bool,
},
/* Aggregated */
Set {
base: Box<TypeRef>,
bound: Option<Bound>,
},
List {
base: Box<TypeRef>,
bound: Option<Bound>,
unique: bool,
},
}
impl TypeRef {
/// Returns `true` iff `self` is:
/// - a simple type,
/// - a named type whose underlying type is simple, or,
/// - a set or list of a type `x` such that `x.is_simple() == true`.
pub fn is_simple(&self) -> bool {
match self {
TypeRef::SimpleType(..) => true,
TypeRef::Named { is_simple, .. } => *is_simple,
TypeRef::Set { base, .. } | TypeRef::List { base, .. } => base.is_simple(),
_ => false,
}
}
pub fn from_path(ns: &Namespace, ss: &Constraints, path: &Path) -> Result<Self, SemanticError> {
match path.ty {
ScopeType::Entity => {
let is_supertype = ss.is_supertype(path);
Ok(TypeRef::Entity {
name: path.name.clone(),
scope: path.scope.clone(),
is_supertype,
})
}
ScopeType::Type => {
let mut p = path.clone();
let is_simple = loop {
match ns.get(&p)?.0 {
Named::Type(ast::TypeDecl {
underlying_type, ..
}) => match underlying_type {
// Enumeration e.g.
//
// ```
// TYPE null_style = ENUMERATION OF (null); END_TYPE;
// ```
//
// should be simple because it will be expressed as single integer.
ast::Type::Simple(_) | ast::Type::Enumeration { .. } => break true,
ast::Type::Named(name) => {
p = ns.resolve(&p.scope, name)?.0;
continue;
}
_ => break false,
},
Named::Entity(_) => break false,
}
};
let is_enumerate = match ns.get(path)?.0 {
Named::Type(ast::TypeDecl {
underlying_type, ..
}) => match underlying_type {
// Enumeration e.g.
//
// ```
// TYPE null_style = ENUMERATION OF (null); END_TYPE;
// ```
//
// should be simple because it will be expressed as single integer.
ast::Type::Simple(_) => false,
ast::Type::Enumeration { .. } => true,
_ => false,
},
Named::Entity(_) => false,
};
Ok(TypeRef::Named {
scope: path.scope.clone(),
name: path.name.clone(),
is_simple,
is_enumerate,
})
}
_ => unimplemented!("Path to TypeRef conversion only supports Entity and Types yet."),
}
}
}
impl Legalize for TypeRef {
type Input = ast::Type;
fn legalize(
ns: &Namespace,
ss: &Constraints,
scope: &Scope,
ty: &ast::Type,
) -> Result<Self, SemanticError> {
use ast::Type::*;
Ok(match ty {
Simple(ty) => Self::SimpleType(SimpleType(*ty)),
Named(name) => {
let (path, _index) = ns.resolve(scope, name)?;
Self::from_path(ns, ss, &path)?
}
Set { base, bound } => {
let base = TypeRef::legalize(ns, ss, scope, base.as_ref())?;
let bound = if let Some(bound) = bound {
Some(Legalize::legalize(ns, ss, scope, bound)?)
} else {
None
};
Self::Set {
base: Box::new(base),
bound,
}
}
List {
base,
bound,
unique,
} => {
let base = TypeRef::legalize(ns, ss, scope, base.as_ref())?;
let bound = if let Some(bound) = bound {
Some(Legalize::legalize(ns, ss, scope, bound)?)
} else {
None
};
Self::List {
base: Box::new(base),
bound,
unique: *unique,
}
}
_ => todo!(),
})
}
}