Refactor name-analysis SymbolTable, etc.

src/name_analysis/gather.rs

@@ -2,10 +2,43 @@ use crate::ast::ast_node::{AstNode, AstNodeRef};
 use crate::ast::node::{CompilationUnit, Identifier, UseStatement, UseStatementSuffix};
 use crate::diagnostic::DmDiagnostic;
 use crate::name_analysis::symbol::source_definition::SourceDefinition;
-use crate::name_analysis::symbol::use_symbol::StarUseStatementSymbol;
+use crate::name_analysis::symbol::use_symbol::{ConcreteUseSymbol, StarUseSymbol};
-use crate::name_analysis::symbol::UseStatementSymbol;
+use crate::name_analysis::symbol_table::{SymbolInsertError, SymbolTable};
-use crate::name_analysis::symbol_table::SymbolTable;
+use codespan_reporting::diagnostic::{Diagnostic, Label};
 use std::collections::HashMap;
+use std::range::Range;
+
+fn handle_insert_error(
+    err: SymbolInsertError,
+    error_symbol_name: &str,
+    error_file_id: usize,
+    error_range: Range<usize>,
+    symbol_types: &str,
+    diagnostics: &mut Vec<DmDiagnostic>,
+) {
+    match err {
+        SymbolInsertError::SymbolAlreadyDefined(s) => {
+            let mut diagnostic = Diagnostic::error()
+                .with_message(format!(
+                    "{} symbol '{}' already defined in the current scope.",
+                    symbol_types, error_symbol_name,
+                ))
+                .with_label(
+                    Label::primary(error_file_id, error_range)
+                        .with_message("Symbol duplicated here."),
+                );
+
+            if let Some(source_definition) = s.definition() {
+                diagnostic = diagnostic.with_label(
+                    Label::secondary(source_definition.file_id(), source_definition.range())
+                        .with_message("Symbol defined here."),
+                );
+            }
+
+            diagnostics.push(diagnostic);
+        }
+    }
+}
 
 fn gather_identifier(
     identifier: &Identifier,
@@ -15,27 +48,61 @@ fn gather_identifier(
     identifier_scope_ids.insert(identifier.clone(), symbol_table.current_scope_id());
 }
 
+fn gather_concrete_use_symbol(base_fqn: &str, identifier: &Identifier, symbol_table: &mut SymbolTable, diagnostics: &mut Vec<DmDiagnostic>) {
+    let symbol = ConcreteUseSymbol::new(
+        base_fqn,
+        identifier.name(),
+        Some(SourceDefinition::from_identifier(identifier)),
+    );
+    if let Err(insert_error) = symbol_table.insert_concrete_use_symbol(symbol) {
+        handle_insert_error(
+            insert_error,
+            &base_fqn,
+            identifier.file_id(),
+            identifier.range(),
+            "Use Statement",
+            diagnostics,
+        );
+    }
+}
+
 fn gather_use_statement(
     use_statement: &UseStatement,
     symbol_table: &mut SymbolTable,
     diagnostics: &mut Vec<DmDiagnostic>,
 ) {
-    let mut fully_qualified_name = String::new();
+    let base_fqn = use_statement
-    for prefix in use_statement.prefixes() {
+        .prefixes()
-        fully_qualified_name.push_str(&format!("{}::", prefix.identifier().name()));
+        .map(|prefix| prefix.identifier().name())
-    }
+        .collect::<Vec<_>>()
+        .join("::");
+
     match use_statement.suffix() {
-        UseStatementSuffix::Identifier(identifier) => {}
+        UseStatementSuffix::Identifier(identifier) => {
+            gather_concrete_use_symbol(&base_fqn, identifier, symbol_table, diagnostics);
+        }
         UseStatementSuffix::Star => {
-            let symbol_inner = StarUseStatementSymbol::new(
+            let symbol = StarUseSymbol::new(
-                &fully_qualified_name,
+                &base_fqn,
                 Some(SourceDefinition::from_use_statement(use_statement)),
             );
-            let symbol = UseStatementSymbol::Star(symbol_inner);
+            let insert_result = symbol_table.insert_star_use_symbol(symbol);
-            symbol_table.insert_use_statement_symbol(symbol);
+            if let Err(error) = insert_result {
-            todo!()
+                handle_insert_error(
+                    error,
+                    &base_fqn,
+                    use_statement.file_id(),
+                    use_statement.range(),
+                    "Use Statement",
+                    diagnostics,
+                );
+            }
+        }
+        UseStatementSuffix::UseList(use_list) => {
+            for identifier in use_list.identifiers() {
+                gather_concrete_use_symbol(&base_fqn, identifier, symbol_table, diagnostics);
+            }
         }
-        UseStatementSuffix::UseList(use_list) => {}
     }
 }
 

src/name_analysis/symbol/class_member_symbol.rs

@@ -0,0 +1,45 @@
+use crate::name_analysis::symbol::source_definition::SourceDefinition;
+use std::fmt::{Debug, Formatter};
+
+#[derive(Clone)]
+pub struct ClassMemberSymbol {
+    declared_name: String,
+    is_field: bool,
+    source_definition: Option<SourceDefinition>,
+}
+
+impl ClassMemberSymbol {
+    pub fn new(
+        declared_name: &str,
+        is_field: bool,
+        source_definition: Option<SourceDefinition>,
+    ) -> Self {
+        Self {
+            declared_name: declared_name.to_string(),
+            is_field,
+            source_definition,
+        }
+    }
+
+    pub fn declared_name(&self) -> &str {
+        &self.declared_name
+    }
+
+    pub fn is_field(&self) -> bool {
+        self.is_field
+    }
+
+    pub fn source_definition(&self) -> Option<&SourceDefinition> {
+        self.source_definition.as_ref()
+    }
+}
+
+impl Debug for ClassMemberSymbol {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("ClassMemberSymbol")
+            .field("declared_name", &self.declared_name)
+            .field("is_field", &self.is_field)
+            .field("source_definition", &self.source_definition)
+            .finish()
+    }
+}

src/name_analysis/symbol/function_symbol.rs

@@ -0,0 +1,101 @@
+use crate::name_analysis::symbol::parameter_symbol::ParameterSymbol;
+use crate::name_analysis::symbol::source_definition::SourceDefinition;
+use crate::name_analysis::symbol::type_symbol::ConcreteTypeSymbol;
+use std::fmt::{Debug, Formatter};
+
+#[derive(Clone)]
+pub struct FunctionSymbol {
+    fqn: String,
+    declared_name: String,
+    is_public: bool,
+    is_platform: bool,
+    source_definition: Option<SourceDefinition>,
+    parameters: Vec<ParameterSymbol>,
+    return_type: Option<ConcreteTypeSymbol>, // todo: can we use TypeSymbol?
+}
+
+impl FunctionSymbol {
+    pub fn without_parameters_or_return_type(
+        fqn: &str,
+        declared_name: &str,
+        is_public: bool,
+        is_platform: bool,
+        source_definition: Option<SourceDefinition>,
+    ) -> FunctionSymbol {
+        FunctionSymbol {
+            fqn: fqn.to_string(),
+            declared_name: declared_name.to_string(),
+            is_public,
+            is_platform,
+            source_definition,
+            parameters: Vec::new(),
+            return_type: None,
+        }
+    }
+
+    pub fn with_parameters(self, parameters: Vec<ParameterSymbol>) -> Self {
+        Self {
+            fqn: self.fqn,
+            declared_name: self.declared_name,
+            is_public: self.is_public,
+            is_platform: self.is_platform,
+            source_definition: self.source_definition,
+            parameters,
+            return_type: self.return_type,
+        }
+    }
+
+    pub fn with_return_type(self, return_type: ConcreteTypeSymbol) -> Self {
+        Self {
+            fqn: self.fqn,
+            declared_name: self.declared_name,
+            is_public: self.is_public,
+            is_platform: self.is_platform,
+            source_definition: self.source_definition,
+            parameters: self.parameters,
+            return_type: Some(return_type),
+        }
+    }
+
+    pub fn fqn(&self) -> &str {
+        &self.fqn
+    }
+
+    pub fn declared_name(&self) -> &str {
+        &self.declared_name
+    }
+
+    pub fn is_public(&self) -> bool {
+        self.is_public
+    }
+
+    pub fn is_platform(&self) -> bool {
+        self.is_platform
+    }
+
+    pub fn source_definition(&self) -> Option<&SourceDefinition> {
+        self.source_definition.as_ref()
+    }
+
+    pub fn parameters(&self) -> &[ParameterSymbol] {
+        &self.parameters
+    }
+
+    pub fn return_type(&self) -> Option<&ConcreteTypeSymbol> {
+        self.return_type.as_ref()
+    }
+}
+
+impl Debug for FunctionSymbol {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("FunctionSymbol")
+            .field("fqn", &self.fqn)
+            .field("declared_name", &self.declared_name)
+            .field("is_public", &self.is_public)
+            .field("is_platform", &self.is_platform)
+            .field("parameters", &self.parameters)
+            .field("return_type", &self.return_type)
+            .field("source_definition", &self.source_definition)
+            .finish()
+    }
+}

src/name_analysis/symbol/mod.rs

@@ -1,445 +1,46 @@
-pub(super) mod source_definition;
+pub(crate) mod class_member_symbol;
-pub(super) mod use_symbol;
+pub(crate) mod function_symbol;
+pub(crate) mod module_symbol;
+pub(crate) mod parameter_symbol;
+pub(crate) mod source_definition;
+pub(crate) mod type_symbol;
+pub(crate) mod use_symbol;
+pub(crate) mod variable_symbol;
 
-use crate::ast::node::Identifier;
+use crate::name_analysis::symbol::use_symbol::{ConcreteUseSymbol, StarUseSymbol};
+use class_member_symbol::ClassMemberSymbol;
+use function_symbol::FunctionSymbol;
+use module_symbol::ModuleSymbol;
+use parameter_symbol::ParameterSymbol;
 use source_definition::SourceDefinition;
-use std::cell::RefCell;
+use std::fmt::{Debug, Display};
-use std::fmt::{Debug, Display, Formatter};
 use std::ops::Deref;
-use std::rc::Rc;
+use type_symbol::TypeSymbol;
-
+use variable_symbol::VariableSymbol;
-pub trait SymbolInner {
-    fn declared_name(&self) -> &str;
-    fn definition(&self) -> Option<SourceDefinition>;
-}
-
-/* Symbol */
 
 #[derive(Debug, Clone)]
 pub enum Symbol {
-    UseStatement(Rc<RefCell<UseStatementSymbol>>),
+    ConcreteUse(ConcreteUseSymbol),
-    Module(Rc<ModuleSymbol>),
+    StarUse(StarUseSymbol),
-    Type(Rc<TypeSymbol>),
+    Module(ModuleSymbol),
-    Function(Rc<RefCell<FunctionSymbol>>),
+    Type(TypeSymbol),
-    Parameter(Rc<ParameterSymbol>),
+    Function(FunctionSymbol),
-    Variable(Rc<VariableSymbol>),
+    Parameter(ParameterSymbol),
-    ClassMember(Rc<ClassMemberSymbol>),
+    Variable(VariableSymbol),
+    ClassMember(ClassMemberSymbol),
 }
 
 impl Symbol {
-    pub fn definition(&self) -> Option<SourceDefinition> {
+    pub fn definition(&self) -> Option<&SourceDefinition> {
         match self {
-            Symbol::UseStatement(s) => s.borrow().definition(),
+            Symbol::ConcreteUse(concrete) => concrete.source_definition(),
-            Symbol::Module(s) => s.definition(),
+            Symbol::StarUse(star) => star.source_definition(),
-            Symbol::Type(s) => match s.deref() {
+            Symbol::Module(module) => module.source_definition(),
-                TypeSymbol::Concrete(cts) => cts.definition(),
+            Symbol::Type(type_symbol) => type_symbol.source_definition(),
-                TypeSymbol::Generic(gts) => gts.definition(),
+            Symbol::Function(function_symbol) => function_symbol.source_definition(),
-            },
+            Symbol::Parameter(parameter_symbol) => parameter_symbol.source_definition(),
-            Symbol::Function(s) => s.borrow().definition(),
+            Symbol::Variable(variable_symbol) => variable_symbol.source_definition(),
-            Symbol::Parameter(s) => s.definition(),
+            Symbol::ClassMember(class_member_symbol) => class_member_symbol.source_definition(),
-            Symbol::Variable(s) => s.definition(),
-            Symbol::ClassMember(s) => s.definition(),
-        }
-    }
-
-    pub fn unwrap_use_statement_symbol(&self) -> Rc<RefCell<UseStatementSymbol>> {
-        match self {
-            Symbol::UseStatement(s) => s.clone(),
-            _ => panic!("unwrap_use_statement_symbol called on non-use statement symbol"),
         }
     }
 }
-
-/* Use-statement */
-
-pub struct UseStatementSymbol {
-    pub fqn: String,
-    pub declared_name: String,
-    definition: Option<SourceDefinition>,
-    referenced_symbol: Option<Box<Symbol>>,
-}
-
-impl UseStatementSymbol {
-    pub fn new(fqn: &str, declared_name: &str, identifier: Option<&Identifier>) -> Self {
-        UseStatementSymbol {
-            fqn: fqn.to_string(),
-            declared_name: declared_name.to_string(),
-            definition: identifier.map(SourceDefinition::from_identifier),
-            referenced_symbol: None,
-        }
-    }
-
-    pub fn set_referenced_symbol(&mut self, referenced_symbol: Symbol) {
-        self.referenced_symbol = Some(Box::new(referenced_symbol));
-    }
-
-    pub fn referenced_symbol(&self) -> Option<Box<Symbol>> {
-        self.referenced_symbol.clone()
-    }
-}
-
-impl SymbolInner for UseStatementSymbol {
-    fn declared_name(&self) -> &str {
-        &self.declared_name
-    }
-
-    fn definition(&self) -> Option<SourceDefinition> {
-        self.definition.clone()
-    }
-}
-
-impl Debug for UseStatementSymbol {
-    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-        f.debug_struct("UseStatementSymbol")
-            .field("fqn", &self.fqn)
-            .field("declared_name", &self.declared_name)
-            .field("referenced_symbol", &self.referenced_symbol)
-            .finish()
-    }
-}
-
-/* Module */
-
-pub struct ModuleSymbol {
-    fqn: String,
-    declared_name: String,
-    is_public: bool,
-    definition: Option<SourceDefinition>,
-}
-
-impl ModuleSymbol {
-    pub fn new(
-        fqn: &str,
-        declared_name: &str,
-        is_public: bool,
-        identifier: Option<&Identifier>,
-    ) -> ModuleSymbol {
-        ModuleSymbol {
-            fqn: fqn.to_string(),
-            declared_name: declared_name.to_string(),
-            is_public,
-            definition: identifier.map(SourceDefinition::from_identifier),
-        }
-    }
-}
-
-impl SymbolInner for ModuleSymbol {
-    fn declared_name(&self) -> &str {
-        self.declared_name.as_str()
-    }
-
-    fn definition(&self) -> Option<SourceDefinition> {
-        self.definition.clone()
-    }
-}
-
-impl Debug for ModuleSymbol {
-    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-        f.debug_struct("ModuleSymbol")
-            .field("fqn", &self.fqn)
-            .field("declared_name", &self.declared_name)
-            .field("is_public", &self.is_public)
-            .finish()
-    }
-}
-
-/* TypeSymbol */
-
-#[derive(Debug)]
-pub enum TypeSymbol {
-    Concrete(ConcreteTypeSymbol),
-    Generic(GenericTypeSymbol),
-}
-
-impl TypeSymbol {
-    pub fn declared_name(&self) -> &str {
-        match self {
-            TypeSymbol::Concrete(t) => t.declared_name(),
-            TypeSymbol::Generic(t) => t.declared_name(),
-        }
-    }
-}
-
-pub struct ConcreteTypeSymbol {
-    fqn: String,
-    declared_name: String,
-    is_public: bool,
-    definition: Option<SourceDefinition>,
-}
-
-impl ConcreteTypeSymbol {
-    pub fn new(
-        fqn: &str,
-        declared_name: &str,
-        is_public: bool,
-        identifier: Option<&Identifier>,
-    ) -> Self {
-        ConcreteTypeSymbol {
-            fqn: fqn.to_string(),
-            declared_name: declared_name.to_string(),
-            is_public,
-            definition: identifier.map(SourceDefinition::from_identifier),
-        }
-    }
-
-    pub fn fqn(&self) -> &str {
-        &self.fqn
-    }
-
-    pub fn is_public(&self) -> bool {
-        self.is_public
-    }
-}
-
-impl SymbolInner for ConcreteTypeSymbol {
-    fn declared_name(&self) -> &str {
-        &self.declared_name
-    }
-
-    fn definition(&self) -> Option<SourceDefinition> {
-        self.definition.clone()
-    }
-}
-
-impl Debug for ConcreteTypeSymbol {
-    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-        f.debug_struct("TypeSymbol")
-            .field("fqn", &self.fqn)
-            .field("declared_name", &self.declared_name)
-            .field("is_public", &self.is_public)
-            .finish()
-    }
-}
-
-pub struct GenericTypeSymbol {
-    declared_name: String,
-    source_definition: SourceDefinition,
-}
-
-impl GenericTypeSymbol {
-    pub fn new(declared_name: &str, source_definition: SourceDefinition) -> Self {
-        GenericTypeSymbol {
-            declared_name: declared_name.to_string(),
-            source_definition,
-        }
-    }
-}
-
-impl SymbolInner for GenericTypeSymbol {
-    fn declared_name(&self) -> &str {
-        self.declared_name.as_str()
-    }
-
-    fn definition(&self) -> Option<SourceDefinition> {
-        Some(self.source_definition.clone())
-    }
-}
-
-impl Debug for GenericTypeSymbol {
-    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-        f.debug_struct("GenericTypeSymbol")
-            .field("declared_name", &self.declared_name)
-            .finish()
-    }
-}
-
-/* Function */
-
-pub struct FunctionSymbol {
-    fqn: String,
-    declared_name: String,
-    is_public: bool,
-    is_platform: bool,
-    definition: Option<SourceDefinition>,
-    parameters: Vec<Rc<ParameterSymbol>>,
-    return_type: Option<Rc<ConcreteTypeSymbol>>,
-}
-
-impl FunctionSymbol {
-    pub fn new(
-        fqn: &str,
-        declared_name: &str,
-        is_public: bool,
-        is_platform: bool,
-        identifier: Option<&Identifier>,
-    ) -> FunctionSymbol {
-        FunctionSymbol {
-            fqn: fqn.to_string(),
-            declared_name: declared_name.to_string(),
-            is_public,
-            is_platform,
-            definition: identifier.map(SourceDefinition::from_identifier),
-            parameters: Vec::new(),
-            return_type: None,
-        }
-    }
-
-    pub fn with_parameters(self, parameters: Vec<ParameterSymbol>) -> Self {
-        Self {
-            fqn: self.fqn,
-            declared_name: self.declared_name,
-            is_public: self.is_public,
-            is_platform: self.is_platform,
-            definition: self.definition,
-            parameters: parameters
-                .into_iter()
-                .map(|parameter| Rc::new(parameter))
-                .collect(),
-            return_type: self.return_type,
-        }
-    }
-
-    pub fn with_return_type(self, return_type: ConcreteTypeSymbol) -> Self {
-        Self {
-            fqn: self.fqn,
-            declared_name: self.declared_name,
-            is_public: self.is_public,
-            is_platform: self.is_platform,
-            definition: self.definition,
-            parameters: self.parameters,
-            return_type: Some(Rc::new(return_type)),
-        }
-    }
-
-    pub fn fqn(&self) -> &str {
-        &self.fqn
-    }
-
-    pub fn set_parameters(&mut self, parameters: Vec<Rc<ParameterSymbol>>) {
-        self.parameters = parameters;
-    }
-
-    pub fn set_return_type(&mut self, return_type: Rc<ConcreteTypeSymbol>) {
-        self.return_type = Some(return_type);
-    }
-}
-
-impl SymbolInner for FunctionSymbol {
-    fn declared_name(&self) -> &str {
-        self.declared_name.as_str()
-    }
-
-    fn definition(&self) -> Option<SourceDefinition> {
-        self.definition.clone()
-    }
-}
-
-impl Debug for FunctionSymbol {
-    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-        f.debug_struct("FunctionSymbol")
-            .field("fqn", &self.fqn)
-            .field("declared_name", &self.declared_name)
-            .field("is_public", &self.is_public)
-            .field("is_platform", &self.is_platform)
-            .field("parameters", &self.parameters)
-            .field("return_type", &self.return_type)
-            .finish()
-    }
-}
-
-/* Parameter */
-
-pub struct ParameterSymbol {
-    declared_name: String,
-    definition: Option<SourceDefinition>,
-}
-
-impl ParameterSymbol {
-    pub fn new(declared_name: &str, identifier: Option<&Identifier>) -> Self {
-        ParameterSymbol {
-            declared_name: declared_name.to_string(),
-            definition: identifier.map(SourceDefinition::from_identifier),
-        }
-    }
-}
-
-impl SymbolInner for ParameterSymbol {
-    fn declared_name(&self) -> &str {
-        &self.declared_name
-    }
-
-    fn definition(&self) -> Option<SourceDefinition> {
-        self.definition.clone()
-    }
-}
-
-impl Debug for ParameterSymbol {
-    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-        f.debug_struct("ParameterSymbol")
-            .field("declared_name", &self.declared_name)
-            .finish()
-    }
-}
-
-/* Variable */
-
-pub struct VariableSymbol {
-    declared_name: String,
-    is_mutable: bool,
-    definition: Option<SourceDefinition>,
-}
-
-impl VariableSymbol {
-    pub fn new(declared_name: &str, is_mutable: bool, identifier: Option<&Identifier>) -> Self {
-        VariableSymbol {
-            declared_name: declared_name.to_string(),
-            is_mutable,
-            definition: identifier.map(SourceDefinition::from_identifier),
-        }
-    }
-}
-
-impl SymbolInner for VariableSymbol {
-    fn declared_name(&self) -> &str {
-        self.declared_name.as_str()
-    }
-
-    fn definition(&self) -> Option<SourceDefinition> {
-        self.definition.clone()
-    }
-}
-
-impl Debug for VariableSymbol {
-    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-        f.debug_struct("VariableSymbol")
-            .field("declared_name", &self.declared_name)
-            .field("is_mutable", &self.is_mutable)
-            .finish()
-    }
-}
-
-/* Class Member */
-
-pub struct ClassMemberSymbol {
-    declared_name: String,
-    is_field: bool,
-    definition: Option<SourceDefinition>,
-}
-
-impl ClassMemberSymbol {
-    pub fn new(declared_name: &str, is_field: bool, definition: Option<SourceDefinition>) -> Self {
-        ClassMemberSymbol {
-            declared_name: declared_name.to_string(),
-            is_field,
-            definition,
-        }
-    }
-}
-
-impl SymbolInner for ClassMemberSymbol {
-    fn declared_name(&self) -> &str {
-        self.declared_name.as_str()
-    }
-
-    fn definition(&self) -> Option<SourceDefinition> {
-        self.definition.clone()
-    }
-}
-
-impl Debug for ClassMemberSymbol {
-    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-        f.debug_struct("ClassMemberSymbol")
-            .field("declared_name", &self.declared_name)
-            .finish()
-    }
-}

src/name_analysis/symbol/module_symbol.rs

@@ -0,0 +1,53 @@
+use crate::name_analysis::symbol::source_definition::SourceDefinition;
+use std::fmt::{Debug, Formatter};
+
+#[derive(Clone)]
+pub struct ModuleSymbol {
+    fqn: String,
+    declared_name: String,
+    is_public: bool,
+    source_definition: Option<SourceDefinition>,
+}
+
+impl ModuleSymbol {
+    pub fn new(
+        fqn: &str,
+        declared_name: &str,
+        is_public: bool,
+        source_definition: Option<SourceDefinition>,
+    ) -> Self {
+        Self {
+            fqn: fqn.to_string(),
+            declared_name: declared_name.to_string(),
+            is_public,
+            source_definition,
+        }
+    }
+
+    pub fn fqn(&self) -> &str {
+        &self.fqn
+    }
+
+    pub fn declared_name(&self) -> &str {
+        &self.declared_name
+    }
+
+    pub fn is_public(&self) -> bool {
+        self.is_public
+    }
+
+    pub fn source_definition(&self) -> Option<&SourceDefinition> {
+        self.source_definition.as_ref()
+    }
+}
+
+impl Debug for ModuleSymbol {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("ModuleSymbol")
+            .field("fqn", &self.fqn)
+            .field("declared_name", &self.declared_name)
+            .field("is_public", &self.is_public)
+            .field("source_definition", &self.source_definition)
+            .finish()
+    }
+}

src/name_analysis/symbol/parameter_symbol.rs

@@ -0,0 +1,34 @@
+use crate::name_analysis::symbol::source_definition::SourceDefinition;
+use std::fmt::{Debug, Formatter};
+
+#[derive(Clone)]
+pub struct ParameterSymbol {
+    declared_name: String,
+    source_definition: Option<SourceDefinition>,
+}
+
+impl ParameterSymbol {
+    pub fn new(declared_name: &str, source_definition: Option<SourceDefinition>) -> Self {
+        ParameterSymbol {
+            declared_name: declared_name.to_string(),
+            source_definition,
+        }
+    }
+    
+    pub fn declared_name(&self) -> &str {
+        &self.declared_name
+    }
+    
+    pub fn source_definition(&self) -> Option<&SourceDefinition> {
+        self.source_definition.as_ref()
+    }
+}
+
+impl Debug for ParameterSymbol {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("ParameterSymbol")
+            .field("declared_name", &self.declared_name)
+            .field("source_definition", &self.source_definition)
+            .finish()
+    }
+}

src/name_analysis/symbol/type_symbol.rs

@@ -0,0 +1,107 @@
+use crate::name_analysis::symbol::source_definition::SourceDefinition;
+use std::fmt::{Debug, Formatter};
+
+#[derive(Clone, Debug)]
+pub enum TypeSymbol {
+    Concrete(ConcreteTypeSymbol),
+    Generic(GenericTypeSymbol),
+}
+
+impl TypeSymbol {
+    pub fn declared_name(&self) -> &str {
+        match self {
+            TypeSymbol::Concrete(t) => t.declared_name(),
+            TypeSymbol::Generic(t) => t.declared_name(),
+        }
+    }
+    
+    pub fn source_definition(&self) -> Option<&SourceDefinition> {
+        match self {
+            TypeSymbol::Concrete(t) => t.source_definition(),
+            TypeSymbol::Generic(t) => t.source_definition(),
+        }
+    }
+}
+
+#[derive(Clone)]
+pub struct ConcreteTypeSymbol {
+    fqn: String,
+    declared_name: String,
+    is_public: bool,
+    source_definition: Option<SourceDefinition>,
+}
+
+impl ConcreteTypeSymbol {
+    pub fn new(
+        fqn: &str,
+        declared_name: &str,
+        is_public: bool,
+        source_definition: Option<SourceDefinition>,
+    ) -> Self {
+        Self {
+            fqn: fqn.to_string(),
+            declared_name: declared_name.to_string(),
+            is_public,
+            source_definition
+        }
+    }
+
+    pub fn fqn(&self) -> &str {
+        &self.fqn
+    }
+
+    pub fn is_public(&self) -> bool {
+        self.is_public
+    }
+    
+    pub fn declared_name(&self) -> &str {
+        &self.declared_name
+    }
+    
+    pub fn source_definition(&self) -> Option<&SourceDefinition> {
+        self.source_definition.as_ref()
+    }
+}
+
+impl Debug for ConcreteTypeSymbol {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("TypeSymbol")
+            .field("fqn", &self.fqn)
+            .field("declared_name", &self.declared_name)
+            .field("is_public", &self.is_public)
+            .field("source_definition", &self.source_definition)
+            .finish()
+    }
+}
+
+#[derive(Clone)]
+pub struct GenericTypeSymbol {
+    declared_name: String,
+    source_definition: Option<SourceDefinition>,
+}
+
+impl GenericTypeSymbol {
+    pub fn new(declared_name: &str, source_definition: Option<SourceDefinition>) -> Self {
+        GenericTypeSymbol {
+            declared_name: declared_name.to_string(),
+            source_definition,
+        }
+    }
+    
+    pub fn declared_name(&self) -> &str {
+        &self.declared_name
+    }
+    
+    pub fn source_definition(&self) -> Option<&SourceDefinition> {
+        self.source_definition.as_ref()
+    }
+}
+
+impl Debug for GenericTypeSymbol {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("GenericTypeSymbol")
+            .field("declared_name", &self.declared_name)
+            .field("source_definition", &self.source_definition)
+            .finish()
+    }
+}

src/name_analysis/symbol/use_symbol.rs

@@ -1,16 +1,56 @@
 use crate::name_analysis::symbol::source_definition::SourceDefinition;
+use std::fmt::{Debug, Formatter};
 
-pub enum UseStatementSymbol {
+#[derive(Clone)]
-    Concrete,
+pub struct ConcreteUseSymbol {
-    Star(StarUseStatementSymbol),
+    base_fqn: String,
+    declared_name: String,
+    source_definition: Option<SourceDefinition>,
 }
 
-pub struct StarUseStatementSymbol {
+impl ConcreteUseSymbol {
+    pub fn new(
+        base_fqn: &str,
+        declared_name: &str,
+        source_definition: Option<SourceDefinition>,
+    ) -> Self {
+        Self {
+            base_fqn: base_fqn.to_string(),
+            declared_name: declared_name.to_string(),
+            source_definition,
+        }
+    }
+
+    pub fn base_fqn(&self) -> &str {
+        &self.base_fqn
+    }
+
+    pub fn declared_name(&self) -> &str {
+        &self.declared_name
+    }
+
+    pub fn source_definition(&self) -> Option<&SourceDefinition> {
+        self.source_definition.as_ref()
+    }
+}
+
+impl Debug for ConcreteUseSymbol {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("ConcreteUseStatementSymbol")
+            .field("base_fqn", &self.base_fqn)
+            .field("declared_name", &self.declared_name)
+            .field("source_definition", &self.source_definition)
+            .finish()
+    }
+}
+
+#[derive(Clone)]
+pub struct StarUseSymbol {
     base_fqn: String,
     source_definition: Option<SourceDefinition>,
 }
 
-impl StarUseStatementSymbol {
+impl StarUseSymbol {
     pub fn new(base_fqn: &str, source_definition: Option<SourceDefinition>) -> Self {
         Self {
             base_fqn: base_fqn.to_string(),
@@ -26,3 +66,12 @@ impl StarUseStatementSymbol {
         self.source_definition.as_ref()
     }
 }
+
+impl Debug for StarUseSymbol {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("StarUseStatementSymbol")
+            .field("base_fqn", &self.base_fqn)
+            .field("source_definition", &self.source_definition)
+            .finish()
+    }
+}

src/name_analysis/symbol/variable_symbol.rs

@@ -0,0 +1,41 @@
+use crate::name_analysis::symbol::source_definition::SourceDefinition;
+use std::fmt::{Debug, Formatter};
+
+#[derive(Clone)]
+pub struct VariableSymbol {
+    declared_name: String,
+    is_mutable: bool,
+    source_definition: Option<SourceDefinition>,
+}
+
+impl VariableSymbol {
+    pub fn new(declared_name: &str, is_mutable: bool, source_definition: Option<SourceDefinition>) -> Self {
+        VariableSymbol {
+            declared_name: declared_name.to_string(),
+            is_mutable,
+            source_definition,
+        }
+    }
+
+    pub fn declared_name(&self) -> &str {
+        &self.declared_name
+    }
+    
+    pub fn is_mutable(&self) -> bool {
+        self.is_mutable
+    }
+    
+    pub fn source_definition(&self) -> Option<&SourceDefinition> {
+        self.source_definition.as_ref()
+    }
+}
+
+impl Debug for VariableSymbol {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("VariableSymbol")
+            .field("declared_name", &self.declared_name)
+            .field("is_mutable", &self.is_mutable)
+            .field("source_definition", &self.source_definition)
+            .finish()
+    }
+}

src/name_analysis/symbol_table.rs

@@ -1,468 +0,0 @@
-use crate::name_analysis::symbol::*;
-use crate::name_analysis::symbol_table::SymbolInsertError::SymbolAlreadyDefined;
-use crate::name_analysis::symbol_table::SymbolLookupError::NoDefinition;
-use std::cell::RefCell;
-use std::collections::HashMap;
-use std::fmt::Display;
-use std::ops::Deref;
-use std::rc::Rc;
-
-/* Scope */
-
-#[derive(Debug)]
-struct Scope {
-    parent: Option<usize>,
-    use_statement_symbols: HashMap<String, Rc<RefCell<UseStatementSymbol>>>,
-    module_symbols: HashMap<String, Rc<ModuleSymbol>>,
-    type_symbols: HashMap<String, Rc<TypeSymbol>>,
-    function_symbols: HashMap<String, Rc<RefCell<FunctionSymbol>>>,
-    parameter_symbols: HashMap<String, Rc<ParameterSymbol>>,
-    variable_symbols: HashMap<String, Rc<VariableSymbol>>,
-    class_member_symbols: HashMap<String, Rc<ClassMemberSymbol>>,
-    debug_name: String,
-}
-
-impl Scope {
-    pub fn new(parent: Option<usize>, debug_name: String) -> Scope {
-        Scope {
-            parent,
-            use_statement_symbols: HashMap::new(),
-            module_symbols: HashMap::new(),
-            type_symbols: HashMap::new(),
-            function_symbols: HashMap::new(),
-            parameter_symbols: HashMap::new(),
-            variable_symbols: HashMap::new(),
-            class_member_symbols: HashMap::new(),
-            debug_name,
-        }
-    }
-
-    fn get_module_symbol_by_declared_name(&self, name: &str) -> Option<Rc<ModuleSymbol>> {
-        for module_symbol in self.module_symbols.values() {
-            if module_symbol.declared_name() == name {
-                return Some(module_symbol.clone());
-            }
-        }
-        None
-    }
-
-    fn get_type_symbol_by_declared_name(&self, declared_name: &str) -> Option<Rc<TypeSymbol>> {
-        if let Some(type_symbol) = self.type_symbols.get(declared_name) {
-            Some(type_symbol.clone())
-        } else {
-            for use_statement_symbol in self.use_statement_symbols.values() {
-                let borrowed = use_statement_symbol.borrow();
-                if borrowed.declared_name() == declared_name {
-                    if let Some(referenced_symbol) = borrowed.referenced_symbol() {
-                        match *referenced_symbol {
-                            Symbol::Type(type_symbol) => return Some(type_symbol.clone()),
-                            _ => continue,
-                        }
-                    }
-                }
-            }
-            None
-        }
-    }
-
-    fn get_type_symbol_by_fqn(&self, fqn: &str) -> Option<Rc<TypeSymbol>> {
-        self.type_symbols
-            .values()
-            .find(|s| match s.deref().deref() {
-                TypeSymbol::Concrete(cts) => cts.fqn() == fqn,
-                _ => false,
-            })
-            .cloned()
-    }
-
-    fn get_usable_symbol_by_fqn(&self, fqn: &str) -> Option<Symbol> {
-        for function_symbol in self.function_symbols.values() {
-            if function_symbol.borrow().fqn() == fqn {
-                return Some(Symbol::Function(function_symbol.clone()));
-            }
-        }
-        for type_symbol in self.type_symbols.values() {
-            match type_symbol.deref() {
-                TypeSymbol::Concrete(concrete_type_symbol) => {
-                    if concrete_type_symbol.fqn() == fqn {
-                        return Some(Symbol::Type(type_symbol.clone()));
-                    }
-                }
-                _ => continue,
-            }
-        }
-        None
-    }
-
-    fn get_usable_symbol_by_declared_name(&self, declared_name: &str) -> Option<Symbol> {
-        for function_symbol in self.function_symbols.values() {
-            if function_symbol.borrow().declared_name() == declared_name {
-                return Some(Symbol::Function(function_symbol.clone()));
-            }
-        }
-        for type_symbol in self.type_symbols.values() {
-            if type_symbol.declared_name() == declared_name {
-                return Some(Symbol::Type(type_symbol.clone()));
-            }
-        }
-        None
-    }
-
-    fn get_value_symbol_by_declared_name(&self, declared_name: &str) -> Option<Symbol> {
-        for variable_symbol in self.variable_symbols.values() {
-            if variable_symbol.declared_name() == declared_name {
-                return Some(Symbol::Variable(variable_symbol.clone()));
-            }
-        }
-        for parameter_symbol in self.parameter_symbols.values() {
-            if parameter_symbol.declared_name() == declared_name {
-                return Some(Symbol::Parameter(parameter_symbol.clone()));
-            }
-        }
-        None
-    }
-
-    fn get_expressible_by_declared_name(&self, declared_name: &str) -> Option<Symbol> {
-        self.variable_symbols
-            .get(declared_name)
-            .map(|s| Symbol::Variable(s.clone()))
-            .or_else(|| {
-                self.parameter_symbols
-                    .get(declared_name)
-                    .map(|p| Symbol::Parameter(p.clone()))
-            })
-            .or_else(|| {
-                self.class_member_symbols
-                    .get(declared_name)
-                    .map(|cms| Symbol::ClassMember(cms.clone()))
-            })
-            .or_else(|| {
-                self.function_symbols
-                    .get(declared_name)
-                    .map(|f| Symbol::Function(f.clone()))
-            })
-            .or_else(|| {
-                self.type_symbols
-                    .get(declared_name)
-                    .map(|t| Symbol::Type(t.clone()))
-            })
-            .or_else(|| {
-                self.use_statement_symbols
-                    .get(declared_name)
-                    .map(|us| Symbol::UseStatement(us.clone()))
-            })
-    }
-
-    fn get_expressible_by_fqn(&self, fqn: &str) -> Option<Symbol> {
-        self.function_symbols
-            .values()
-            .find(|fs| fs.borrow().fqn() == fqn)
-            .map(|f| Symbol::Function(f.clone()))
-            .or_else(|| {
-                self.get_type_symbol_by_fqn(fqn)
-                    .map(|ts| Symbol::Type(ts.clone()))
-            })
-    }
-}
-
-/* Symbol table */
-
-#[derive(Debug)]
-pub enum SymbolInsertError {
-    SymbolAlreadyDefined(Symbol),
-}
-
-#[derive(Debug)]
-pub enum SymbolLookupError {
-    NoDefinition,
-}
-
-#[derive(Debug)]
-pub struct SymbolTable {
-    scopes: Vec<Scope>,
-    current_scope_id: usize,
-}
-
-/// Contains a vec of scopes, like a flattened tree
-impl SymbolTable {
-    pub fn new() -> Self {
-        let mut t = SymbolTable {
-            scopes: vec![Scope::new(None, String::from("GlobalScope"))],
-            current_scope_id: 0,
-        };
-        t
-    }
-
-    pub fn current_scope_id(&self) -> usize {
-        self.current_scope_id
-    }
-
-    pub fn scopes(&self) -> &Vec<Scope> {
-        &self.scopes
-    }
-
-    pub fn push_scope(&mut self, debug_name: &str) {
-        let id = self.scopes.len();
-        self.scopes.push(Scope::new(
-            Some(self.current_scope_id),
-            debug_name.to_string(),
-        ));
-        self.current_scope_id = id;
-    }
-
-    pub fn pop_scope(&mut self) {
-        if let Some(parent_id) = self.scopes[self.current_scope_id].parent {
-            self.current_scope_id = parent_id;
-        }
-    }
-
-    pub fn insert_use_statement_symbol(
-        &mut self,
-        use_statement_symbol: UseStatementSymbol,
-    ) -> Result<Rc<RefCell<UseStatementSymbol>>, SymbolInsertError> {
-        let current_scope = self.scopes.get_mut(self.current_scope_id).unwrap();
-        if let Some(defined_symbol) =
-            current_scope.get_usable_symbol_by_declared_name(use_statement_symbol.declared_name())
-        {
-            Err(SymbolAlreadyDefined(defined_symbol))
-        } else {
-            let declared_name = use_statement_symbol.declared_name().to_string();
-            let to_insert = Rc::new(RefCell::new(use_statement_symbol));
-            let to_return = to_insert.clone();
-            current_scope
-                .use_statement_symbols
-                .insert(declared_name, to_insert);
-            Ok(to_return)
-        }
-    }
-
-    pub fn insert_module_symbol(
-        &mut self,
-        module_symbol: ModuleSymbol,
-    ) -> Result<(), SymbolInsertError> {
-        let current_scope = self.scopes.get_mut(self.current_scope_id).unwrap();
-        if let Some(defined_symbol) =
-            current_scope.get_module_symbol_by_declared_name(module_symbol.declared_name())
-        {
-            Err(SymbolAlreadyDefined(Symbol::Module(defined_symbol.clone())))
-        } else {
-            current_scope.module_symbols.insert(
-                module_symbol.declared_name().to_string(),
-                Rc::new(module_symbol),
-            );
-            Ok(())
-        }
-    }
-
-    pub fn insert_type_symbol(&mut self, type_symbol: TypeSymbol) -> Result<(), SymbolInsertError> {
-        let current_scope = self.scopes.get_mut(self.current_scope_id).unwrap();
-        if let Some(defined_symbol) =
-            current_scope.get_usable_symbol_by_declared_name(type_symbol.declared_name())
-        {
-            Err(SymbolAlreadyDefined(defined_symbol))
-        } else {
-            current_scope.type_symbols.insert(
-                type_symbol.declared_name().to_string(),
-                Rc::new(type_symbol),
-            );
-            Ok(())
-        }
-    }
-
-    pub fn insert_function_symbol(
-        &mut self,
-        function_symbol: FunctionSymbol,
-    ) -> Result<Rc<RefCell<FunctionSymbol>>, SymbolInsertError> {
-        let current_scope = self.scopes.get_mut(self.current_scope_id).unwrap();
-        if let Some(defined_symbol) =
-            current_scope.get_usable_symbol_by_declared_name(function_symbol.declared_name())
-        {
-            Err(SymbolAlreadyDefined(defined_symbol))
-        } else {
-            let declared_name = function_symbol.declared_name().to_string();
-            let to_insert = Rc::new(RefCell::new(function_symbol));
-            let to_return = to_insert.clone();
-            current_scope
-                .function_symbols
-                .insert(declared_name, to_insert);
-            Ok(to_return)
-        }
-    }
-
-    pub fn insert_parameter_symbol(
-        &mut self,
-        parameter_symbol: ParameterSymbol,
-    ) -> Result<Rc<ParameterSymbol>, SymbolInsertError> {
-        let current_scope = self.scopes.get_mut(self.current_scope_id).unwrap();
-        if let Some(defined_symbol) =
-            current_scope.get_value_symbol_by_declared_name(parameter_symbol.declared_name())
-        {
-            Err(SymbolAlreadyDefined(defined_symbol))
-        } else {
-            let to_insert = Rc::new(parameter_symbol);
-            let to_return = to_insert.clone();
-            current_scope
-                .parameter_symbols
-                .insert(to_insert.declared_name().to_string(), to_insert);
-            Ok(to_return)
-        }
-    }
-
-    pub fn insert_variable_symbol(
-        &mut self,
-        variable_symbol: VariableSymbol,
-    ) -> Result<Rc<VariableSymbol>, SymbolInsertError> {
-        let current_scope = self.scopes.get_mut(self.current_scope_id).unwrap();
-        if let Some(defined_symbol) =
-            current_scope.get_value_symbol_by_declared_name(variable_symbol.declared_name())
-        {
-            Err(SymbolAlreadyDefined(defined_symbol))
-        } else {
-            let declared_name = variable_symbol.declared_name().to_string();
-            let to_insert = Rc::new(variable_symbol);
-            let to_return = to_insert.clone();
-            current_scope
-                .variable_symbols
-                .insert(declared_name, to_insert);
-            Ok(to_return)
-        }
-    }
-
-    pub fn insert_class_member_symbol(
-        &mut self,
-        class_member_symbol: ClassMemberSymbol,
-    ) -> Result<(), SymbolInsertError> {
-        let current_scope = self.scopes.get_mut(self.current_scope_id).unwrap();
-        if let Some(defined_symbol) =
-            current_scope.get_expressible_by_declared_name(class_member_symbol.declared_name())
-        {
-            Err(SymbolAlreadyDefined(defined_symbol))
-        } else {
-            current_scope.class_member_symbols.insert(
-                class_member_symbol.declared_name().to_string(),
-                Rc::new(class_member_symbol),
-            );
-            Ok(())
-        }
-    }
-
-    pub fn lookup_type_by_declared_name(
-        &self,
-        declared_name: &str,
-        scope_id: usize,
-    ) -> Result<Rc<TypeSymbol>, SymbolLookupError> {
-        let mut scope_opt = Some(&self.scopes[scope_id]);
-        while let Some(scope) = scope_opt {
-            if let Some(symbol) = scope.get_type_symbol_by_declared_name(declared_name) {
-                return Ok(symbol);
-            }
-            scope_opt = if let Some(parent_id) = scope.parent {
-                Some(&self.scopes[parent_id])
-            } else {
-                None
-            }
-        }
-        Err(NoDefinition)
-    }
-
-    pub fn lookup_type_by_fqn(
-        &self,
-        fqn: &str,
-        scope_id: usize,
-    ) -> Result<Rc<TypeSymbol>, SymbolLookupError> {
-        let mut scope_opt = Some(&self.scopes[scope_id]);
-        while let Some(scope) = scope_opt {
-            if let Some(symbol) = scope.get_type_symbol_by_fqn(fqn) {
-                return Ok(symbol);
-            }
-            scope_opt = if let Some(parent_id) = scope.parent {
-                Some(&self.scopes[parent_id])
-            } else {
-                None
-            }
-        }
-        Err(NoDefinition)
-    }
-
-    pub fn lookup_usable_by_fqn(
-        &self,
-        fully_qualified_name: &str,
-        scope_id: usize,
-    ) -> Result<Symbol, SymbolLookupError> {
-        for scope in &self.scopes {
-            if let Some(symbol) = scope.get_usable_symbol_by_fqn(fully_qualified_name) {
-                return Ok(symbol);
-            }
-        }
-        Err(NoDefinition)
-    }
-
-    pub fn lookup_expressible_by_declared_name(
-        &self,
-        declared_name: &str,
-        scope_id: usize,
-    ) -> Result<Symbol, SymbolLookupError> {
-        let mut scope_opt = Some(&self.scopes[scope_id]);
-        while let Some(scope) = scope_opt {
-            if let Some(symbol) = scope.get_expressible_by_declared_name(declared_name) {
-                return Ok(symbol);
-            }
-            scope_opt = if let Some(parent_id) = scope.parent {
-                Some(&self.scopes[parent_id])
-            } else {
-                None
-            }
-        }
-        Err(NoDefinition)
-    }
-
-    pub fn lookup_expressible_by_fqn(
-        &self,
-        fqn: &str,
-        scope_id: usize,
-    ) -> Result<Symbol, SymbolLookupError> {
-        let mut scope_opt = Some(&self.scopes[scope_id]);
-        while let Some(scope) = scope_opt {
-            if let Some(symbol) = scope.get_expressible_by_fqn(fqn) {
-                return Ok(symbol);
-            }
-            scope_opt = if let Some(parent_id) = scope.parent {
-                Some(&self.scopes[parent_id])
-            } else {
-                None
-            }
-        }
-        Err(NoDefinition)
-    }
-}
-
-impl Display for SymbolTable {
-    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
-        writeln!(f, "SymbolTable(current_scope = {})", self.current_scope_id)?;
-        for (i, scope) in self.scopes.iter().enumerate() {
-            writeln!(f, "----Scope {} {}----", i, scope.debug_name)?;
-            for symbol in scope.use_statement_symbols.values() {
-                writeln!(f, "{:#?}", symbol.borrow())?;
-            }
-            for symbol in scope.module_symbols.values() {
-                writeln!(f, "{:#?}", symbol)?;
-            }
-            for symbol in scope.type_symbols.values() {
-                writeln!(f, "{:#?}", symbol)?;
-            }
-            for symbol in scope.function_symbols.values() {
-                writeln!(f, "{:#?}", symbol.borrow())?;
-            }
-            for symbol in scope.parameter_symbols.values() {
-                writeln!(f, "{:#?}", symbol)?;
-            }
-            for symbol in scope.variable_symbols.values() {
-                writeln!(f, "{:#?}", symbol)?;
-            }
-            for symbol in scope.class_member_symbols.values() {
-                writeln!(f, "{:#?}", symbol)?;
-            }
-        }
-        Ok(())
-    }
-}

src/name_analysis/symbol_table/mod.rs

@@ -0,0 +1,333 @@
+use crate::name_analysis::symbol::class_member_symbol::ClassMemberSymbol;
+use crate::name_analysis::symbol::function_symbol::FunctionSymbol;
+use crate::name_analysis::symbol::module_symbol::ModuleSymbol;
+use crate::name_analysis::symbol::parameter_symbol::ParameterSymbol;
+use crate::name_analysis::symbol::type_symbol::TypeSymbol;
+use crate::name_analysis::symbol::use_symbol::{ConcreteUseSymbol, StarUseSymbol};
+use crate::name_analysis::symbol::variable_symbol::VariableSymbol;
+use crate::name_analysis::symbol::*;
+use crate::name_analysis::symbol_table::SymbolInsertError::SymbolAlreadyDefined;
+use crate::name_analysis::symbol_table::SymbolLookupError::NoDefinition;
+use scope::Scope;
+use std::fmt::Display;
+use std::ops::Deref;
+
+mod scope;
+
+#[derive(Debug)]
+pub enum SymbolInsertError {
+    SymbolAlreadyDefined(Symbol),
+}
+
+#[derive(Debug)]
+pub enum SymbolLookupError {
+    NoDefinition,
+}
+
+#[derive(Debug)]
+pub struct SymbolTable {
+    scopes: Vec<Scope>,
+    current_scope_id: usize,
+}
+
+/// Contains a vec of scopes, like a flattened tree
+impl SymbolTable {
+    pub fn new() -> Self {
+        Self {
+            scopes: vec![Scope::new(None, 0, String::from("GlobalScope"))],
+            current_scope_id: 0,
+        }
+    }
+
+    pub fn current_scope_id(&self) -> usize {
+        self.current_scope_id
+    }
+
+    pub fn push_scope(&mut self, debug_name: &str) {
+        let id = self.scopes.len();
+        self.scopes
+            .push(Scope::new(Some(self.current_scope_id), id, debug_name.to_string()));
+        self.current_scope_id = id;
+    }
+
+    pub fn pop_scope(&mut self) {
+        if let Some(parent_id) = self.scopes[self.current_scope_id].parent() {
+            self.current_scope_id = parent_id;
+        }
+    }
+
+    fn current_scope(&self) -> &Scope {
+        self.scopes.last().unwrap()
+    }
+
+    fn current_scope_mut(&mut self) -> &mut Scope {
+        self.scopes.last_mut().unwrap()
+    }
+
+    fn find_current_scope_concrete_use_symbol(
+        &self,
+        declared_name: &str,
+    ) -> Option<&ConcreteUseSymbol> {
+        self.current_scope()
+            .concrete_use_symbols()
+            .get(declared_name)
+    }
+
+    fn find_current_scope_star_use_symbol(&self, base_fqn: &str) -> Option<&StarUseSymbol> {
+        self.current_scope().star_use_symbols().get(base_fqn)
+    }
+
+    fn find_current_scope_type_symbol(&self, declared_name: &str) -> Option<&TypeSymbol> {
+        self.current_scope().type_symbols().get(declared_name)
+    }
+
+    fn find_current_scope_module_symbol(&self, declared_name: &str) -> Option<&ModuleSymbol> {
+        self.current_scope().module_symbols().get(declared_name)
+    }
+
+    fn find_current_scope_parameter_symbol(&self, declared_name: &str) -> Option<&ParameterSymbol> {
+        self.current_scope().parameter_symbols().get(declared_name)
+    }
+
+    fn find_current_scope_variable_symbol(&self, declared_name: &str) -> Option<&VariableSymbol> {
+        self.current_scope().variable_symbols().get(declared_name)
+    }
+
+    fn find_current_scope_class_member_symbol(
+        &self,
+        declared_name: &str,
+    ) -> Option<&ClassMemberSymbol> {
+        self.current_scope()
+            .class_member_symbols()
+            .get(declared_name)
+    }
+
+    fn find_current_scope_variable_or_parameter_symbol(
+        &self,
+        declared_name: &str,
+    ) -> Option<Symbol> {
+        self.find_current_scope_variable_symbol(declared_name)
+            .map(|variable_symbol| Symbol::Variable(variable_symbol.clone()))
+            .or_else(|| {
+                self.find_current_scope_parameter_symbol(declared_name)
+                    .map(|parameter_symbol| Symbol::Parameter(parameter_symbol.clone()))
+            })
+    }
+
+    fn find_current_scope_usable_symbol(&self, declared_name: &str) -> Option<Symbol> {
+        self.find_current_scope_concrete_use_symbol(declared_name)
+            .map(|concrete_use_symbol| Symbol::ConcreteUse(concrete_use_symbol.clone()))
+            .or_else(|| {
+                self.find_current_scope_type_symbol(declared_name)
+                    .map(|type_symbol| Symbol::Type(type_symbol.clone()))
+            })
+            .or_else(|| {
+                self.find_current_scope_module_symbol(declared_name)
+                    .map(|module_symbol| Symbol::Module(module_symbol.clone()))
+            })
+    }
+
+    pub fn insert_concrete_use_symbol(
+        &mut self,
+        concrete_use_symbol: ConcreteUseSymbol,
+    ) -> Result<(), SymbolInsertError> {
+        if let Some(defined_symbol) =
+            self.find_current_scope_usable_symbol(concrete_use_symbol.declared_name())
+        {
+            Err(SymbolAlreadyDefined(defined_symbol))
+        } else {
+            self.current_scope_mut().concrete_use_symbols_mut().insert(
+                concrete_use_symbol.declared_name().to_string(),
+                concrete_use_symbol,
+            );
+            Ok(())
+        }
+    }
+
+    pub fn insert_star_use_symbol(
+        &mut self,
+        star_use_symbol: StarUseSymbol,
+    ) -> Result<(), SymbolInsertError> {
+        if let Some(defined_symbol) =
+            self.find_current_scope_star_use_symbol(star_use_symbol.base_fqn())
+        {
+            Err(SymbolAlreadyDefined(Symbol::StarUse(
+                defined_symbol.clone(),
+            )))
+        } else {
+            self.current_scope_mut()
+                .star_use_symbols_mut()
+                .insert(star_use_symbol.base_fqn().to_string(), star_use_symbol);
+            Ok(())
+        }
+    }
+
+    pub fn insert_module_symbol(
+        &mut self,
+        module_symbol: ModuleSymbol,
+    ) -> Result<(), SymbolInsertError> {
+        if let Some(defined_symbol) =
+            self.find_current_scope_usable_symbol(module_symbol.declared_name())
+        {
+            Err(SymbolAlreadyDefined(defined_symbol))
+        } else {
+            self.current_scope_mut()
+                .module_symbols_mut()
+                .insert(module_symbol.declared_name().to_string(), module_symbol);
+            Ok(())
+        }
+    }
+
+    pub fn insert_type_symbol(&mut self, type_symbol: TypeSymbol) -> Result<(), SymbolInsertError> {
+        if let Some(defined_symbol) =
+            self.find_current_scope_usable_symbol(type_symbol.declared_name())
+        {
+            Err(SymbolAlreadyDefined(defined_symbol))
+        } else {
+            self.current_scope_mut()
+                .type_symbols_mut()
+                .insert(type_symbol.declared_name().to_string(), type_symbol);
+            Ok(())
+        }
+    }
+
+    pub fn insert_function_symbol(
+        &mut self,
+        function_symbol: FunctionSymbol,
+    ) -> Result<(), SymbolInsertError> {
+        if let Some(defined_symbol) =
+            self.find_current_scope_usable_symbol(function_symbol.declared_name())
+        {
+            Err(SymbolAlreadyDefined(defined_symbol))
+        } else {
+            self.current_scope_mut()
+                .function_symbols_mut()
+                .insert(function_symbol.declared_name().to_string(), function_symbol);
+            Ok(())
+        }
+    }
+
+    pub fn insert_parameter_symbol(
+        &mut self,
+        parameter_symbol: ParameterSymbol,
+    ) -> Result<(), SymbolInsertError> {
+        if let Some(defined_symbol) =
+            self.find_current_scope_parameter_symbol(parameter_symbol.declared_name())
+        {
+            Err(SymbolAlreadyDefined(Symbol::Parameter(
+                defined_symbol.clone(),
+            )))
+        } else {
+            self.current_scope_mut().parameter_symbols_mut().insert(
+                parameter_symbol.declared_name().to_string(),
+                parameter_symbol,
+            );
+            Ok(())
+        }
+    }
+
+    pub fn insert_variable_symbol(
+        &mut self,
+        variable_symbol: VariableSymbol,
+    ) -> Result<(), SymbolInsertError> {
+        if let Some(defined_symbol) =
+            self.find_current_scope_variable_or_parameter_symbol(variable_symbol.declared_name())
+        {
+            Err(SymbolAlreadyDefined(defined_symbol))
+        } else {
+            self.current_scope_mut()
+                .variable_symbols_mut()
+                .insert(variable_symbol.declared_name().to_string(), variable_symbol);
+            Ok(())
+        }
+    }
+
+    pub fn insert_class_member_symbol(
+        &mut self,
+        class_member_symbol: ClassMemberSymbol,
+    ) -> Result<(), SymbolInsertError> {
+        if let Some(defined_symbol) =
+            self.find_current_scope_class_member_symbol(class_member_symbol.declared_name())
+        {
+            Err(SymbolAlreadyDefined(Symbol::ClassMember(
+                defined_symbol.clone(),
+            )))
+        } else {
+            self.current_scope_mut().class_member_symbols_mut().insert(
+                class_member_symbol.declared_name().to_string(),
+                class_member_symbol,
+            );
+            Ok(())
+        }
+    }
+
+    fn lookup_type_in_scope_by_declared_name<'a>(
+        scope: &'a Scope,
+        declared_name: &str,
+    ) -> Option<&'a TypeSymbol> {
+        scope.type_symbols().get(declared_name)
+    }
+
+    pub fn lookup_type_by_declared_name(
+        &self,
+        declared_name: &str,
+        scope_id: usize,
+    ) -> Result<&TypeSymbol, SymbolLookupError> {
+        let mut scope_opt = Some(&self.scopes[scope_id]);
+        while let Some(scope) = scope_opt {
+            if let Some(symbol) = Self::lookup_type_in_scope_by_declared_name(scope, declared_name)
+            {
+                return Ok(symbol);
+            }
+            scope_opt = if let Some(parent_id) = scope.parent() {
+                Some(&self.scopes[parent_id])
+            } else {
+                None
+            }
+        }
+        Err(NoDefinition)
+    }
+
+    fn lookup_type_in_scope_by_fqn<'a>(scope: &'a Scope, fqn: &str) -> Option<&'a TypeSymbol> {
+        for type_symbol in scope.type_symbols().values() {
+            match type_symbol {
+                TypeSymbol::Concrete(concrete_type_symbol) => {
+                    if concrete_type_symbol.fqn() == fqn {
+                        return Some(type_symbol);
+                    }
+                }
+                TypeSymbol::Generic(_) => {}
+            }
+        }
+        None
+    }
+
+    pub fn lookup_type_by_fqn(
+        &self,
+        fqn: &str,
+        scope_id: usize,
+    ) -> Result<&TypeSymbol, SymbolLookupError> {
+        let mut scope_opt = Some(&self.scopes[scope_id]);
+        while let Some(scope) = scope_opt {
+            if let Some(type_symbol) = Self::lookup_type_in_scope_by_fqn(scope, fqn) {
+                return Ok(type_symbol);
+            }
+            scope_opt = if let Some(parent_id) = scope.parent() {
+                Some(&self.scopes[parent_id])
+            } else {
+                None
+            }
+        }
+        Err(NoDefinition)
+    }
+}
+
+impl Display for SymbolTable {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        writeln!(f, "SymbolTable(current_scope = {})", self.current_scope_id)?;
+        for scope in &self.scopes {
+            writeln!(f, "{}", scope)?;
+        }
+        Ok(())
+    }
+}

src/name_analysis/symbol_table/scope.rs

@@ -0,0 +1,141 @@
+use crate::name_analysis::symbol::class_member_symbol::ClassMemberSymbol;
+use crate::name_analysis::symbol::function_symbol::FunctionSymbol;
+use crate::name_analysis::symbol::module_symbol::ModuleSymbol;
+use crate::name_analysis::symbol::parameter_symbol::ParameterSymbol;
+use crate::name_analysis::symbol::type_symbol::TypeSymbol;
+use crate::name_analysis::symbol::use_symbol::{ConcreteUseSymbol, StarUseSymbol};
+use crate::name_analysis::symbol::variable_symbol::VariableSymbol;
+use std::collections::HashMap;
+use std::fmt::{Display, Formatter};
+
+#[derive(Debug)]
+pub struct Scope {
+    parent: Option<usize>,
+    id: usize,
+    concrete_use_symbols: HashMap<String, ConcreteUseSymbol>,
+    star_use_symbols: HashMap<String, StarUseSymbol>,
+    module_symbols: HashMap<String, ModuleSymbol>,
+    type_symbols: HashMap<String, TypeSymbol>,
+    function_symbols: HashMap<String, FunctionSymbol>,
+    parameter_symbols: HashMap<String, ParameterSymbol>,
+    variable_symbols: HashMap<String, VariableSymbol>,
+    class_member_symbols: HashMap<String, ClassMemberSymbol>,
+    debug_name: String,
+}
+
+impl Scope {
+    pub fn new(parent: Option<usize>, id: usize, debug_name: String) -> Self {
+        Self {
+            parent,
+            id,
+            concrete_use_symbols: HashMap::new(),
+            star_use_symbols: HashMap::new(),
+            module_symbols: HashMap::new(),
+            type_symbols: HashMap::new(),
+            function_symbols: HashMap::new(),
+            parameter_symbols: HashMap::new(),
+            variable_symbols: HashMap::new(),
+            class_member_symbols: HashMap::new(),
+            debug_name,
+        }
+    }
+
+    pub fn parent(&self) -> Option<usize> {
+        self.parent
+    }
+
+    pub fn id(&self) -> usize {
+        self.id
+    }
+
+    pub fn concrete_use_symbols(&self) -> &HashMap<String, ConcreteUseSymbol> {
+        &self.concrete_use_symbols
+    }
+
+    pub fn concrete_use_symbols_mut(&mut self) -> &mut HashMap<String, ConcreteUseSymbol> {
+        &mut self.concrete_use_symbols
+    }
+
+    pub fn star_use_symbols(&self) -> &HashMap<String, StarUseSymbol> {
+        &self.star_use_symbols
+    }
+
+    pub fn star_use_symbols_mut(&mut self) -> &mut HashMap<String, StarUseSymbol> {
+        &mut self.star_use_symbols
+    }
+
+    pub fn module_symbols(&self) -> &HashMap<String, ModuleSymbol> {
+        &self.module_symbols
+    }
+
+    pub fn module_symbols_mut(&mut self) -> &mut HashMap<String, ModuleSymbol> {
+        &mut self.module_symbols
+    }
+
+    pub fn type_symbols(&self) -> &HashMap<String, TypeSymbol> {
+        &self.type_symbols
+    }
+
+    pub fn type_symbols_mut(&mut self) -> &mut HashMap<String, TypeSymbol> {
+        &mut self.type_symbols
+    }
+
+    pub fn function_symbols(&self) -> &HashMap<String, FunctionSymbol> {
+        &self.function_symbols
+    }
+
+    pub fn function_symbols_mut(&mut self) -> &mut HashMap<String, FunctionSymbol> {
+        &mut self.function_symbols
+    }
+
+    pub fn parameter_symbols(&self) -> &HashMap<String, ParameterSymbol> {
+        &self.parameter_symbols
+    }
+
+    pub fn parameter_symbols_mut(&mut self) -> &mut HashMap<String, ParameterSymbol> {
+        &mut self.parameter_symbols
+    }
+
+    pub fn variable_symbols(&self) -> &HashMap<String, VariableSymbol> {
+        &self.variable_symbols
+    }
+
+    pub fn variable_symbols_mut(&mut self) -> &mut HashMap<String, VariableSymbol> {
+        &mut self.variable_symbols
+    }
+
+    pub fn class_member_symbols(&self) -> &HashMap<String, ClassMemberSymbol> {
+        &self.class_member_symbols
+    }
+
+    pub fn class_member_symbols_mut(&mut self) -> &mut HashMap<String, ClassMemberSymbol> {
+        &mut self.class_member_symbols
+    }
+
+    pub fn debug_name(&self) -> &str {
+        &self.debug_name
+    }
+}
+
+macro_rules! write_symbols {
+    ( $f:expr, $symbols:expr ) => {
+        for symbol in $symbols.values() {
+            writeln!($f, "{:#?}", symbol)?;
+        }
+    };
+}
+
+impl Display for Scope {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        writeln!(f, "----Scope {} {}----", self.id(), self.debug_name())?;
+        write_symbols!(f, self.concrete_use_symbols());
+        write_symbols!(f, self.star_use_symbols());
+        write_symbols!(f, self.module_symbols());
+        write_symbols!(f, self.type_symbols());
+        write_symbols!(f, self.function_symbols());
+        write_symbols!(f, self.parameter_symbols());
+        write_symbols!(f, self.variable_symbols());
+        write_symbols!(f, self.class_member_symbols());
+        Ok(())
+    }
+}

src/std_core/mod.rs

@@ -1,14 +1,27 @@
-use crate::name_analysis::symbol::{FunctionSymbol, ParameterSymbol};
+use crate::name_analysis::symbol::function_symbol::FunctionSymbol;
+use crate::name_analysis::symbol::parameter_symbol::ParameterSymbol;
 use crate::name_analysis::symbol_table::{SymbolInsertError, SymbolTable};
 
 pub fn add_std_core_symbols(symbol_table: &mut SymbolTable) -> Result<(), SymbolInsertError> {
     symbol_table.insert_function_symbol(
-        FunctionSymbol::new("std::core::println", "println", true, true, None)
+        FunctionSymbol::without_parameters_or_return_type(
-            .with_parameters(vec![ParameterSymbol::new("msg", None)]),
+            "std::core::println",
+            "println",
+            true,
+            true,
+            None,
+        )
+        .with_parameters(vec![ParameterSymbol::new("msg", None)]),
     )?;
     symbol_table.insert_function_symbol(
-        FunctionSymbol::new("std::core::print", "print", true, true, None)
+        FunctionSymbol::without_parameters_or_return_type(
-            .with_parameters(vec![ParameterSymbol::new("msg", None)]),
+            "std::core::print",
+            "print",
+            true,
+            true,
+            None,
+        )
+        .with_parameters(vec![ParameterSymbol::new("msg", None)]),
     )?;
     Ok(())
 }