120 lines
4.1 KiB
Rust
120 lines
4.1 KiB
Rust
use std::rc::Rc;
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use crate::schala::SymbolTableHandle;
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use crate::symbol_table::{ScopeSegment, FullyQualifiedSymbolName};
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use crate::ast::*;
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use crate::util::ScopeStack;
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type FQSNPrefix = Vec<ScopeSegment>;
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pub struct ScopeResolver<'a> {
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symbol_table_handle: SymbolTableHandle,
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name_scope_stack: ScopeStack<'a, Rc<String>, FQSNPrefix>,
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}
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impl<'a> ASTVisitor for ScopeResolver<'a> {
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//TODO need to un-insert these - maybe need to rethink visitor
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fn import(&mut self, import_spec: &ImportSpecifier) {
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let ref symbol_table = self.symbol_table_handle.borrow();
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let ImportSpecifier { ref path_components, ref imported_names, .. } = &import_spec;
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match imported_names {
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ImportedNames::All => {
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let prefix = FullyQualifiedSymbolName(path_components.iter().map(|c| ScopeSegment {
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name: c.clone(),
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}).collect());
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let members = symbol_table.lookup_children_of_fqsn(&prefix);
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for member in members.into_iter() {
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let local_name = member.0.last().unwrap().name.clone();
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self.name_scope_stack.insert(local_name.clone(), member.0);
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}
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},
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ImportedNames::LastOfPath => {
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let name = path_components.last().unwrap(); //TODO handle better
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let fqsn_prefix = path_components.iter().map(|c| ScopeSegment {
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name: c.clone(),
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}).collect();
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self.name_scope_stack.insert(name.clone(), fqsn_prefix);
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}
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ImportedNames::List(ref names) => {
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let fqsn_prefix: FQSNPrefix = path_components.iter().map(|c| ScopeSegment {
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name: c.clone(),
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}).collect();
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for name in names.iter() {
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self.name_scope_stack.insert(name.clone(), fqsn_prefix.clone());
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}
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}
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};
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}
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fn qualified_name(&mut self, qualified_name: &QualifiedName) {
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let ref mut symbol_table = self.symbol_table_handle.borrow_mut();
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let fqsn = self.lookup_name_in_scope(&qualified_name);
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let ref id = qualified_name.id;
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symbol_table.map_id_to_fqsn(id, fqsn);
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}
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fn named_struct(&mut self, name: &QualifiedName, _fields: &Vec<(Rc<String>, Expression)>) {
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let ref mut symbol_table = self.symbol_table_handle.borrow_mut();
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let ref id = name.id;
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let fqsn = self.lookup_name_in_scope(&name);
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symbol_table.map_id_to_fqsn(id, fqsn);
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}
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fn pattern(&mut self, pat: &Pattern) {
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use Pattern::*;
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match pat {
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Ignored => (),
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TuplePattern(_) => (),
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Literal(_) => (),
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TupleStruct(name, _) => self.qualified_name_in_pattern(name),
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Record(name, _) => self.qualified_name_in_pattern(name),
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VarOrName(name) => self.qualified_name_in_pattern(name),
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};
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}
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}
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impl<'a> ScopeResolver<'a> {
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pub fn new(symbol_table_handle: SymbolTableHandle) -> ScopeResolver<'static> {
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let name_scope_stack = ScopeStack::new(None);
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ScopeResolver { symbol_table_handle, name_scope_stack }
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}
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pub fn resolve(&mut self, ast: &mut AST) -> Result<(), String> {
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walk_ast(self, ast);
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Ok(())
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}
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fn lookup_name_in_scope(&self, sym_name: &QualifiedName) -> FullyQualifiedSymbolName {
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let QualifiedName { components, .. } = sym_name;
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let first_component = &components[0];
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match self.name_scope_stack.lookup(first_component) {
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None => {
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FullyQualifiedSymbolName(components.iter().map(|name| ScopeSegment { name: name.clone() }).collect())
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},
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Some(fqsn_prefix) => {
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let mut full_name = fqsn_prefix.clone();
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let rest_of_name: FQSNPrefix = components[1..].iter().map(|name| ScopeSegment { name: name.clone() }).collect();
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full_name.extend_from_slice(&rest_of_name);
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FullyQualifiedSymbolName(full_name)
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}
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}
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}
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/// this might be a variable or a pattern. if a variable, set to none
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fn qualified_name_in_pattern(&mut self, qualified_name: &QualifiedName) {
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let ref mut symbol_table = self.symbol_table_handle.borrow_mut();
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let ref id = qualified_name.id;
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let fqsn = self.lookup_name_in_scope(qualified_name);
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if symbol_table.lookup_by_fqsn(&fqsn).is_some() {
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symbol_table.map_id_to_fqsn(&id, fqsn);
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}
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}
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}
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#[cfg(test)]
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mod tests {
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#[test]
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fn basic_scope() {
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}
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}
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