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use super::{scope::*, SemanticError};
use crate::ast::{self, SyntaxTree};
use std::collections::HashMap;
/// Named AST portion of corresponding [Path]
#[derive(Debug, Clone, Copy)] // Copy since this is actually immutable reference
pub enum Named<'st> {
Type(&'st ast::TypeDecl),
Entity(&'st ast::Entity),
}
/// Namespace of loaded EXPRESS schema
///
/// This struct will be constructed at the first time of IR creation,
/// and is responsible for
///
/// - Resolving name in each [Scope] into [Path]
/// - Get a reference to AST portion corresponding to [Path]
///
#[derive(Debug, Clone)]
pub struct Namespace<'st> {
pub names: HashMap<Scope, Vec<(ScopeType, String, usize)>>,
/// Indexed AST portion
pub ast: Vec<(Path, Named<'st>)>,
}
impl<'st> std::ops::Index<usize> for Namespace<'st> {
type Output = (Path, Named<'st>);
fn index(&self, id: usize) -> &Self::Output {
&self.ast[id]
}
}
impl<'st> std::ops::Index<&Scope> for Namespace<'st> {
type Output = [(ScopeType, String, usize)];
fn index(&self, id: &Scope) -> &Self::Output {
&self.names[id]
}
}
impl<'st> Namespace<'st> {
pub fn new(st: &'st SyntaxTree) -> Self {
let mut names = HashMap::new();
let mut ast = Vec::new();
let root = Scope::root();
for schema in &st.schemas {
let here = root.pushed(ScopeType::Schema, &schema.name);
let mut current_names = Vec::new();
for ty in &schema.types {
let name = &ty.type_id;
let path = Path::new(&here, ScopeType::Type, name);
let index = ast.len();
ast.push((path, Named::Type(ty)));
current_names.push((ScopeType::Type, name.to_string(), index));
}
for entity in &schema.entities {
let name = &entity.name;
let path = Path::new(&here, ScopeType::Entity, name);
let index = ast.len();
ast.push((path, Named::Entity(entity)));
current_names.push((ScopeType::Entity, name.to_string(), index));
}
names.insert(here, current_names);
}
Namespace { names, ast }
}
pub fn is_empty(&self) -> bool {
self.ast.is_empty()
}
/// Size of indexed AST
pub fn len(&self) -> usize {
self.ast.len()
}
/// Resolve a `name` referred in a `scope` into the full path.
///
/// Error
/// ------
/// - If no corresponding definition found.
///
pub fn resolve(&self, scope: &Scope, name: &str) -> Result<(Path, usize), SemanticError> {
let mut scope = scope.clone();
loop {
if let Some(names) = self.names.get(&scope) {
for (ty, n, index) in names {
if name == n {
return Ok((Path::new(&scope, *ty, n), *index));
}
}
}
scope = scope.popped().ok_or_else(|| SemanticError::TypeNotFound {
scope: scope.clone(),
name: name.to_string(),
})?;
}
}
/// Get an AST portion and its index corresponding the [Path]
///
/// Error
/// ------
/// - Input path is invalid, i.e. No item is specified by the path.
///
pub fn get(&self, path: &Path) -> Result<(Named, usize), SemanticError> {
for (index, (p, ast)) in self.ast.iter().enumerate() {
if p == path {
return Ok((*ast, index));
}
}
Err(SemanticError::InvalidPath(path.clone()))
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn ns_init() {
let st = SyntaxTree::parse(
r#"
SCHEMA one;
ENTITY first;
m_ref : second;
fattr : STRING;
END_ENTITY;
ENTITY second;
sattr : STRING;
END_ENTITY;
END_SCHEMA;
SCHEMA geometry0;
ENTITY point;
x, y, z: REAL;
END_ENTITY;
END_SCHEMA;
"#
.trim(),
)
.unwrap();
let ns = Namespace::new(&st);
assert_eq!(ns.names.len(), 2);
let root = Scope::root();
for (scope, names) in &ns.names {
if scope == &root.pushed(ScopeType::Schema, "one") {
assert_eq!(names.len(), 2);
}
if scope == &root.pushed(ScopeType::Schema, "geometry0") {
assert_eq!(names.len(), 1);
}
}
}
#[test]
fn namespace_debug() {
let st = ast::SyntaxTree::parse(
r#"
SCHEMA test_schema;
ENTITY base SUPERTYPE OF (ONEOF (sub1, sub2));
x: REAL;
END_ENTITY;
ENTITY sub1 SUBTYPE OF (base);
y1: REAL;
END_ENTITY;
ENTITY sub2 SUBTYPE OF (base);
y2: REAL;
END_ENTITY;
END_SCHEMA;
"#,
)
.unwrap();
let ns = Namespace::new(&st);
insta::assert_snapshot!(format!("{:#?}", ns), @r###"
Namespace {
names: {
Scope(test_schema[Schema]): [
(
Entity,
"base",
0,
),
(
Entity,
"sub1",
1,
),
(
Entity,
"sub2",
2,
),
],
},
ast: [
(
Scope(test_schema[Schema]).base[Entity],
Entity(
Entity {
name: "base",
attributes: [
EntityAttribute {
name: Reference(
"x",
),
ty: Simple(
Real,
),
optional: false,
},
],
constraint: Some(
SuperTypeRule(
OneOf {
exprs: [
Reference(
"sub1",
),
Reference(
"sub2",
),
],
},
),
),
subtype_of: None,
derive_clause: None,
inverse_clause: None,
unique_clause: None,
where_clause: None,
},
),
),
(
Scope(test_schema[Schema]).sub1[Entity],
Entity(
Entity {
name: "sub1",
attributes: [
EntityAttribute {
name: Reference(
"y1",
),
ty: Simple(
Real,
),
optional: false,
},
],
constraint: None,
subtype_of: Some(
SubTypeDecl {
entity_references: [
"base",
],
},
),
derive_clause: None,
inverse_clause: None,
unique_clause: None,
where_clause: None,
},
),
),
(
Scope(test_schema[Schema]).sub2[Entity],
Entity(
Entity {
name: "sub2",
attributes: [
EntityAttribute {
name: Reference(
"y2",
),
ty: Simple(
Real,
),
optional: false,
},
],
constraint: None,
subtype_of: Some(
SubTypeDecl {
entity_references: [
"base",
],
},
),
derive_clause: None,
inverse_clause: None,
unique_clause: None,
where_clause: None,
},
),
),
],
}
"###);
}
}