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#![deny(missing_docs)]
use std::collections::{HashMap, HashSet};
use crate::common::Verbosity;
use crate::common::errors::*;
use crate::common::score::Result;
use crate::common::source::Spanned;
use crate::score::{ScoreContext, ScopeRef, Def, ResolvableName};
#[derive(Clone, Debug)]
pub struct Scope {
pub parent: Option<ScopeRef>,
pub defs: HashMap<ResolvableName, Vec<Spanned<Def>>>,
pub imported_defs: HashMap<ResolvableName, Vec<Spanned<Def>>>,
pub imported_scopes: HashSet<ScopeRef>,
}
impl Scope {
pub fn new(parent: Option<ScopeRef>) -> Scope {
Scope {
parent: parent,
defs: HashMap::new(),
imported_defs: HashMap::new(),
imported_scopes: HashSet::new(),
}
}
}
impl<'lazy, 'sb, 'ast, 'ctx> ScoreContext<'lazy, 'sb, 'ast, 'ctx> {
pub fn with_scope<F,R>(&self, scope: ScopeRef, f: F) -> Result<R>
where F: FnOnce(&mut Scope) -> Result<R>
{
let mut tbl = self.sb.scope2_table.borrow_mut();
let scp = match tbl.get_mut(&scope) {
Some(s) => s,
None => {
self.emit(
DiagBuilder2::bug(format!("scope {:?} does not exist`", scope))
);
return Err(());
}
};
f(scp)
}
pub fn subscope(&self, scope: ScopeRef, parent: ScopeRef) {
self.sb.scope2_table.borrow_mut().insert(scope, Scope::new(Some(parent)));
}
pub fn define(&self, scope: ScopeRef, name: Spanned<ResolvableName>, def: Def) -> Result<()> {
if self.sess.opts.verbosity.contains(Verbosity::NAMES) {
debugln!("define `{}` as {:?} in scope {:?}", name.value, def, scope);
}
self.with_scope(scope, |scope| match def {
Def::Enum(_) => {
scope.defs
.entry(name.value)
.or_insert_with(|| Vec::new())
.push(Spanned::new(def, name.span));
Ok(())
},
_ => {
let ins = scope.defs.insert(name.value, vec![Spanned::new(def, name.span)]);
if let Some(existing) = ins {
self.emit(
DiagBuilder2::error(format!("`{}` has already been declared", name.value))
.span(name.span)
.add_note("Previous declaration was here:")
.span(existing.last().unwrap().span)
);
Err(())
} else {
Ok(())
}
}
})
}
pub fn import_def(&self, scope: ScopeRef, name: Spanned<ResolvableName>, def: Def) -> Result<()> {
self.with_scope(scope, |scope|{
scope.imported_defs
.entry(name.value)
.or_insert_with(|| Vec::new())
.push(Spanned::new(def, name.span));
Ok(())
})
}
pub fn import_scope(&self, scope: ScopeRef, into: ScopeRef) -> Result<()> {
self.with_scope(into, |into|{
into.imported_scopes.insert(scope);
Ok(())
})
}
}