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Implement import aliases

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Allows a module to be imported with an alias:

    import JsonDecode as JD

Import aliases must be unique and they cannot have the same name
as an imported module.
This commit is contained in:
Agus Zubiaga 2024-03-29 17:35:24 -03:00
parent d5a38a26db
commit 842a256907
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6 changed files with 443 additions and 61 deletions
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36
crates/compiler/can/src/env.rs
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@ -72,18 +72,23 @@ impl<'a> Env<'a> {
let module_name = ModuleName::from(module_name_str);
match self.module_ids.get_id(&module_name) {
Some(module_id) => self.qualified_lookup_help(scope, module_id, ident, region),
None => Err(RuntimeError::ModuleNotImported {
module_name,
imported_modules: self
.module_ids
.available_modules()
.map(|string| string.as_ref().into())
.collect(),
region,
module_exists: false,
}),
match scope.get_alias_import_module_id(module_name_str) {
Some(module_id) => self.qualified_lookup_help(scope, *module_id, true, ident, region),
None => match self.module_ids.get_id(&module_name) {
Some(module_id) => {
self.qualified_lookup_help(scope, module_id, false, ident, region)
}
None => Err(RuntimeError::ModuleNotImported {
module_name,
imported_modules: self
.module_ids
.available_modules()
.map(|string| string.as_ref().into())
.collect(),
region,
module_exists: false,
}),
},
}
}
@ -94,7 +99,7 @@ impl<'a> Env<'a> {
ident: &str,
region: Region,
) -> Result<Symbol, RuntimeError> {
self.qualified_lookup_help(scope, module_id, ident, region)
self.qualified_lookup_help(scope, module_id, false, ident, region)
}
/// Returns Err if the symbol resolved, but it was not exposed by the given module
@ -102,6 +107,7 @@ impl<'a> Env<'a> {
&mut self,
scope: &Scope,
module_id: ModuleId,
is_alias_import: bool,
ident: &str,
region: Region,
) -> Result<Symbol, RuntimeError> {
@ -141,7 +147,9 @@ impl<'a> Env<'a> {
}
} else {
match self.dep_idents.get(&module_id) {
Some(exposed_ids) if scope.has_imported_module(&module_id) => {
Some(exposed_ids)
if is_alias_import || scope.has_imported_unaliased_module(&module_id) =>
{
match exposed_ids.get_id(ident) {
Some(ident_id) => {
let symbol = Symbol::new(module_id, ident_id);