Add todos.

TODO.md

@@ -1,6 +1,12 @@
 # TODO/Plans
 
+## May 2025
+
+- Refactor name-analysis to add custom errors for name-analysis only, which can then be tested.
+- Refactor `pub` fields of AST structs into private fields accessed by methods.
+
 ## General Pipeline
+
 - Transform a single file into a `CompilationUnit` AST node.
 - Gather all `CompilationUnit`s and determine which modules need to be built.
   - A module corresponds to one syntactical namespace `ns`, but not its children!
@@ -45,11 +51,13 @@
 ## More Namespace Rules
 
 Top-level namespace declaration:
+
 ```
 decl pub ns std
 ```
 
 Nested namespace declaration and members:
+
 ```
 ns std::core // indicates that all members of this file are in the std::core namespace
 
@@ -64,6 +72,7 @@ pub ns array {
 ## Example of std lib would be coded
 
 std/std.dm
+
 ```
 decl pub ns std {
     decl pub ns core, http, json
@@ -72,6 +81,7 @@ decl pub ns std {
 ```
 
 std/core/core.dm
+
 ```
 ns std
 
@@ -82,6 +92,7 @@ decl pub ns core {
 ```
 
 std/core/array.dm
+
 ```
 ns std::core
 
@@ -119,6 +130,7 @@ pub ns array {
 ```
 
 std/core/hkt/monad.dm
+
 ```
 ns std::core::hkt
 
@@ -132,6 +144,7 @@ pub hkt Monad<T = Self>[a] {
 ```
 
 std/core/string.dm
+
 ```
 ns std::core
 

sketching/may_2025/int.dm

@@ -0,0 +1,13 @@
+int Greeter {
+    fn greet() -> Void
+}
+
+class MyGreeter(fld greeting: String) : Greeter {
+    fn greet() {
+        println(greeting);
+    }
+}
+
+fn main() {
+    let greeter: Greeter = MyGreeter("Hello, World!");
+}

src/ast/build.rs

@@ -494,7 +494,7 @@ fn build_interface_declaration(file_id: usize, interface_pair: Pair<Rule>) -> In
             Rule::Pub => {
                 is_public = true;
             }
-            Rule::Int => {}
+            Rule::IntKw => {}
             Rule::Identifier => {
                 identifier = Some(build_identifier(file_id, inner_pair));
             }
@@ -671,7 +671,46 @@ fn build_interface_function_declaration(
     file_id: usize,
     interface_function_pair: Pair<Rule>,
 ) -> InterfaceFunctionDeclaration {
-    todo!()
+    let mut modifier = None;
+    let mut generics = GenericParameters::default();
+    let mut identifier = None;
+    let mut parameters = Parameters::default();
+    let mut return_type = None;
+    let mut body = None;
+    
+    for inner_pair in interface_function_pair.into_inner() {
+        match inner_pair.as_rule() {
+            Rule::Def | Rule::Fn => {},
+            Rule::FunctionModifier => {
+                modifier = Some(build_function_modifier(file_id, inner_pair));
+            },
+            Rule::GenericParameters => {
+                generics = build_generic_parameters(file_id, inner_pair);
+            }
+            Rule::Identifier => {
+                identifier = Some(build_identifier(file_id, inner_pair));
+            }
+            Rule::Parameters => {
+                parameters = build_parameters(file_id, inner_pair);
+            }
+            Rule::ReturnType => {
+                return_type = Some(build_return_type(file_id, inner_pair));
+            }
+            Rule::FunctionBody => {
+                body = Some(build_function_body(file_id, inner_pair));
+            }
+            _ => unreachable!(),
+        }
+    }
+    
+    InterfaceFunctionDeclaration {
+        modifier,
+        generics,
+        identifier: identifier.unwrap(),
+        parameters,
+        return_type: return_type.unwrap(),
+        body
+    }
 }
 
 fn build_interface_operator_function_declaration(

src/name_analysis/fqn_context.rs

@@ -7,8 +7,8 @@ impl FqnContext {
         FqnContext { stack: Vec::new() }
     }
 
-    pub fn push(&mut self, name: String) {
-        self.stack.push(name);
+    pub fn push(&mut self, name: &str) {
+        self.stack.push(name.to_string());
     }
 
     pub fn pop(&mut self) {

src/name_analysis/gather.rs

@@ -132,12 +132,8 @@ fn gather_function_type_use(
     fqn_context: &mut FqnContext,
     diagnostics: &mut Vec<DmDiagnostic>,
 ) {
-    gather_generic_parameters(
-        &mut function_type_use.generics,
-        symbol_table,
-        fqn_context,
-        diagnostics,
-    );
+    symbol_table.push_scope("FunctionTypeUseScope");
+    gather_generic_parameters(&mut function_type_use.generics, symbol_table, diagnostics);
     gather_parameters(
         &mut function_type_use.parameters,
         symbol_table,
@@ -150,6 +146,7 @@ fn gather_function_type_use(
         fqn_context,
         diagnostics,
     );
+    symbol_table.pop_scope();
 }
 
 /* Generic Arguments */
@@ -170,10 +167,28 @@ fn gather_generic_arguments(
 fn gather_generic_parameters(
     generic_parameters: &mut GenericParameters,
     symbol_table: &mut SymbolTable,
-    fqn_context: &mut FqnContext,
     diagnostics: &mut Vec<DmDiagnostic>,
 ) {
-    todo!("Add each Identifier as a type to the current scope; make sure caller's push/pop before/after")
+    for identifier in &mut generic_parameters.0 {
+        let insert_result =
+            symbol_table.insert_type_symbol(TypeSymbol::Generic(GenericTypeSymbol::new(
+                &identifier.name(),
+                SourceDefinition::from_identifier(identifier),
+            )));
+        match insert_result {
+            Ok(_) => {}
+            Err(insert_error) => {
+                handle_insert_error(
+                    insert_error,
+                    &identifier.name(),
+                    identifier.file_id(),
+                    identifier.range(),
+                    "Type",
+                    diagnostics,
+                );
+            }
+        }
+    }
 }
 
 /* Implements List */
@@ -259,22 +274,12 @@ fn gather_return_type(
         fqn_context,
         diagnostics,
     );
-    gather_references(
-        &mut return_type.references,
-        symbol_table,
-        fqn_context,
-        diagnostics,
-    );
+    gather_references(&mut return_type.references, symbol_table);
 }
 
 /* References */
 
-fn gather_references(
-    references: &mut References,
-    symbol_table: &mut SymbolTable,
-    fqn_context: &mut FqnContext,
-    diagnostics: &mut Vec<DmDiagnostic>,
-) {
+fn gather_references(references: &mut References, symbol_table: &mut SymbolTable) {
     for identifier in &mut references.0 {
         gather_identifier(identifier, symbol_table);
     }
@@ -289,7 +294,7 @@ pub(super) fn gather_compilation_unit(
 ) {
     let mut fqn_context = FqnContext::new();
     if let Some(namespace) = &compilation_unit.namespace {
-        fqn_context.push(namespace.name().to_string());
+        fqn_context.push(&namespace.name());
     }
 
     symbol_table.push_scope(&format!("FileScope({})", compilation_unit.file_name));
@@ -384,6 +389,14 @@ fn gather_module_level_declaration(
         Module(module_declaration) => {
             gather_module_declaration(module_declaration, symbol_table, fqn_context, diagnostics);
         }
+        Interface(interface_declaration) => {
+            gather_interface_declaration(
+                interface_declaration,
+                symbol_table,
+                fqn_context,
+                diagnostics,
+            );
+        }
         Class(class_declaration) => {
             gather_class_declaration(class_declaration, symbol_table, fqn_context, diagnostics)
         }
@@ -398,7 +411,6 @@ fn gather_module_level_declaration(
                 diagnostics,
             );
         }
-        _ => todo!(),
     }
 }
 
@@ -408,7 +420,39 @@ fn gather_interface_level_declaration(
     fqn_context: &mut FqnContext,
     diagnostics: &mut Vec<DmDiagnostic>,
 ) {
-    todo!()
+    use InterfaceLevelDeclaration::*;
+    match declaration {
+        Module(module_declaration) => {
+            gather_module_declaration(module_declaration, symbol_table, fqn_context, diagnostics);
+        }
+        Interface(interface_declaration) => {
+            gather_interface_declaration(
+                interface_declaration,
+                symbol_table,
+                fqn_context,
+                diagnostics,
+            );
+        }
+        Class(class_declaration) => {
+            gather_class_declaration(class_declaration, symbol_table, fqn_context, diagnostics)
+        }
+        Function(interface_function_declaration) => {
+            gather_interface_function_declaration(
+                interface_function_declaration,
+                symbol_table,
+                fqn_context,
+                diagnostics,
+            );
+        }
+        OperatorFunction(interface_operator_function_declaration) => {
+            gather_interface_operator_function_declaration(
+                interface_operator_function_declaration,
+                symbol_table,
+                fqn_context,
+                diagnostics,
+            );
+        }
+    }
 }
 
 fn gather_class_level_declaration(
@@ -417,7 +461,53 @@ fn gather_class_level_declaration(
     fqn_context: &mut FqnContext,
     diagnostics: &mut Vec<DmDiagnostic>,
 ) {
-    todo!()
+    use ClassLevelDeclaration::*;
+    match declaration {
+        Module(module_declaration) => {
+            gather_module_declaration(module_declaration, symbol_table, fqn_context, diagnostics);
+        }
+        Interface(interface_declaration) => {
+            gather_interface_declaration(
+                interface_declaration,
+                symbol_table,
+                fqn_context,
+                diagnostics,
+            );
+        }
+        Class(class_declaration) => {
+            gather_class_declaration(class_declaration, symbol_table, fqn_context, diagnostics);
+        }
+        Function(function_definition) => {
+            gather_function_definition(function_definition, symbol_table, fqn_context, diagnostics);
+        }
+        OperatorFunction(operator_function_definition) => {
+            gather_operator_function_definition(
+                operator_function_definition,
+                symbol_table,
+                fqn_context,
+                diagnostics,
+            );
+        }
+        PlatformFunction(platform_function_declaration) => {
+            gather_platform_function_definition(
+                platform_function_declaration,
+                symbol_table,
+                fqn_context,
+                diagnostics,
+            );
+        }
+        Property(property_declaration) => {
+            gather_property_declaration(
+                property_declaration,
+                symbol_table,
+                fqn_context,
+                diagnostics,
+            );
+        }
+        Field(field_declaration) => {
+            gather_field_declaration(field_declaration, symbol_table, fqn_context, diagnostics);
+        }
+    }
 }
 
 /* Main Declarations */
@@ -429,10 +519,11 @@ fn gather_module_declaration(
     diagnostics: &mut Vec<DmDiagnostic>,
 ) {
     // 1. Add mod identifier symbol
-    // 2. Update fqn context
+    // 2. Push identifier on fqn_context
     // 3. Push scope
     // 4. Process declarations
     // 5. Pop scope
+    // 6. Pop fqn_context
 
     let module_name = declaration.identifier.name();
 
@@ -443,24 +534,78 @@ fn gather_module_declaration(
         Some(&declaration.identifier),
     ));
 
-    if let Err(err) = insert_result {
-        handle_insert_error(
-            err,
+    match insert_result {
+        Ok(_) => {
+            fqn_context.push(&module_name);
+            symbol_table.push_scope(&format!("ModuleScope({})", module_name));
+
+            for inner_declaration in &mut declaration.declarations {
+                gather_module_level_declaration(
+                    inner_declaration,
+                    symbol_table,
+                    fqn_context,
+                    diagnostics,
+                );
+            }
+
+            symbol_table.pop_scope();
+            fqn_context.pop();
+        }
+        Err(insert_error) => handle_insert_error(
+            insert_error,
             &module_name,
             declaration.identifier.file_id(),
             declaration.identifier.range(),
-            "module/type",
+            "Module",
             diagnostics,
-        )
+        ),
     }
+}
 
-    fqn_context.push(module_name.to_string());
+fn gather_interface_declaration(
+    declaration: &mut InterfaceDeclaration,
+    symbol_table: &mut SymbolTable,
+    fqn_context: &mut FqnContext,
+    diagnostics: &mut Vec<DmDiagnostic>,
+) {
+    let interface_name = declaration.identifier.name();
+
+    let insert_result =
+        symbol_table.insert_type_symbol(TypeSymbol::Concrete(ConcreteTypeSymbol::new(
+            &fqn_context.resolve(&interface_name),
+            &interface_name,
+            declaration.is_public,
+            Some(&declaration.identifier),
+        )));
+
+    match insert_result {
+        Ok(_) => {
+            fqn_context.push(&interface_name);
+            symbol_table.push_scope(&format!("InterfaceScope({})", interface_name));
 
-    symbol_table.push_scope(&format!("ModuleScope({})", module_name));
             for inner_declaration in &mut declaration.declarations {
-        gather_module_level_declaration(inner_declaration, symbol_table, fqn_context, diagnostics);
+                gather_interface_level_declaration(
+                    inner_declaration,
+                    symbol_table,
+                    fqn_context,
+                    diagnostics,
+                );
+            }
+
+            symbol_table.pop_scope();
+            fqn_context.pop();
+        }
+        Err(insert_error) => {
+            handle_insert_error(
+                insert_error,
+                &interface_name,
+                declaration.identifier.file_id(),
+                declaration.identifier.range(),
+                "Interface",
+                diagnostics,
+            );
+        }
     }
-    symbol_table.pop_scope()
 }
 
 fn gather_class_declaration(
@@ -469,27 +614,58 @@ fn gather_class_declaration(
     fqn_context: &mut FqnContext,
     diagnostics: &mut Vec<DmDiagnostic>,
 ) {
-    let declared_name = class_declaration.identifier.name();
-    let resolved_name = fqn_context.resolve(&declared_name);
+    let class_name = class_declaration.identifier.name();
 
-    let insert_result = symbol_table.insert_type_symbol(TypeSymbol::new(
-        &resolved_name,
-        &declared_name,
+    let insert_result =
+        symbol_table.insert_type_symbol(TypeSymbol::Concrete(ConcreteTypeSymbol::new(
+            &fqn_context.resolve(&class_name),
+            &class_name,
             class_declaration.is_public,
             Some(&class_declaration.identifier),
-    ));
-    if let Err(err) = insert_result {
+        )));
+
+    match insert_result {
+        Ok(_) => {
+            // Do this first so we can't implement generic parameters!
+            gather_implements_list(
+                &mut class_declaration.implements,
+                symbol_table,
+                fqn_context,
+                diagnostics,
+            );
+
+            fqn_context.push(&class_name);
+            symbol_table.push_scope(&format!("ClassScope({})", class_name));
+
+            gather_generic_parameters(&mut class_declaration.generics, symbol_table, diagnostics);
+
+            if let Some(class_constructor) = &mut class_declaration.class_constructor {
+                gather_class_constructor(class_constructor, symbol_table, fqn_context, diagnostics);
+            }
+
+            for inner_declaration in &mut class_declaration.declarations {
+                gather_class_level_declaration(
+                    inner_declaration,
+                    symbol_table,
+                    fqn_context,
+                    diagnostics,
+                );
+            }
+
+            symbol_table.pop_scope();
+            fqn_context.pop();
+        }
+        Err(insert_error) => {
             handle_insert_error(
-            err,
-            &declared_name,
+                insert_error,
+                &class_name,
                 class_declaration.identifier.file_id(),
                 class_declaration.identifier.range(),
                 "interface/class",
                 diagnostics,
             );
         }
-
-    // todo: scopes, generics, etc.
+    }
 }
 
 /* Function declarations and components */
@@ -646,7 +822,57 @@ fn gather_interface_function_declaration(
     fqn_context: &mut FqnContext,
     diagnostics: &mut Vec<DmDiagnostic>,
 ) {
-    todo!()
+    let name = declaration.identifier.name();
+    let insert_result = symbol_table.insert_function_symbol(FunctionSymbol::new(
+        &fqn_context.resolve(&name),
+        &name,
+        true,
+        false,
+        Some(&declaration.identifier),
+    ));
+
+    match insert_result {
+        Ok(function_symbol) => {
+            symbol_table.push_scope(&format!("FunctionParameterScope({})", &name));
+
+            gather_generic_parameters(&mut declaration.generics, symbol_table, diagnostics);
+
+            let parameters = gather_parameters(
+                &mut declaration.parameters,
+                symbol_table,
+                fqn_context,
+                diagnostics,
+            );
+            if let Some(parameter_symbols) = parameters {
+                function_symbol
+                    .borrow_mut()
+                    .set_parameters(parameter_symbols);
+            }
+
+            gather_return_type(
+                &mut declaration.return_type,
+                symbol_table,
+                fqn_context,
+                diagnostics,
+            );
+
+            if let Some(body) = &mut declaration.body {
+                gather_function_body(body, symbol_table, fqn_context, diagnostics);
+            }
+
+            symbol_table.pop_scope();
+        }
+        Err(insert_error) => {
+            handle_insert_error(
+                insert_error,
+                &name,
+                declaration.identifier.file_id(),
+                declaration.identifier.range(),
+                "Interface Function",
+                diagnostics,
+            );
+        }
+    }
 }
 
 fn gather_interface_operator_function_declaration(
@@ -666,6 +892,7 @@ fn gather_function_body(
 ) {
     use crate::ast::FunctionBody::*;
     match function_body {
+        Equals(expression) => gather_expression(expression, symbol_table, diagnostics),
         Block(block) => gather_block_statement_inner(block, symbol_table, fqn_context, diagnostics),
         _ => todo!(),
     }
@@ -679,7 +906,16 @@ fn gather_class_constructor(
     fqn_context: &mut FqnContext,
     diagnostics: &mut Vec<DmDiagnostic>,
 ) {
-    todo!()
+    for parameter in &mut class_constructor.0 {
+        match parameter {
+            ClassConstructorParameter::Property(property) => {
+                gather_property_declaration(property, symbol_table, fqn_context, diagnostics);
+            }
+            ClassConstructorParameter::Field(field) => {
+                gather_field_declaration(field, symbol_table, fqn_context, diagnostics);
+            }
+        }
+    }
 }
 
 fn gather_property_declaration(
@@ -688,7 +924,23 @@ fn gather_property_declaration(
     fqn_context: &mut FqnContext,
     diagnostics: &mut Vec<DmDiagnostic>,
 ) {
-    todo!()
+    let insert_result = symbol_table.insert_class_member_symbol(
+        ClassMemberSymbol::new(
+            &property_declaration.identifier.name(),
+            false,
+            Some(SourceDefinition::from_identifier(&property_declaration.identifier))
+        )
+    );
+    if let Err(insert_error) = insert_result {
+        handle_insert_error(
+            insert_error,
+            &property_declaration.identifier.name(),
+            property_declaration.identifier.file_id(),
+            property_declaration.identifier.range(),
+            "Data Member",
+            diagnostics,
+        );
+    }
 }
 
 fn gather_field_declaration(
@@ -697,7 +949,23 @@ fn gather_field_declaration(
     fqn_context: &mut FqnContext,
     diagnostics: &mut Vec<DmDiagnostic>,
 ) {
-    todo!()
+    let insert_result = symbol_table.insert_class_member_symbol(
+        ClassMemberSymbol::new(
+            &field_declaration.identifier.name(),
+            true,
+            Some(SourceDefinition::from_identifier(&field_declaration.identifier))
+        )
+    );
+    if let Err(insert_error) = insert_result {
+        handle_insert_error(
+            insert_error,
+            &field_declaration.identifier.name(),
+            field_declaration.identifier.file_id(),
+            field_declaration.identifier.range(),
+            "Data Member",
+            diagnostics,
+        );
+    }
 }
 
 /* Statements */
@@ -819,7 +1087,13 @@ fn gather_if_statement(
     fqn_context: &mut FqnContext,
     diagnostics: &mut Vec<DmDiagnostic>,
 ) {
-    todo!()
+    gather_expression(&mut if_statement.condition, symbol_table, diagnostics);
+    gather_block_statement(
+        &mut if_statement.then_block,
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
 }
 
 fn gather_if_else_statement(
@@ -828,7 +1102,18 @@ fn gather_if_else_statement(
     fqn_context: &mut FqnContext,
     diagnostics: &mut Vec<DmDiagnostic>,
 ) {
-    todo!()
+    gather_if_statement(
+        &mut if_else_statement.if_statement,
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
+    for if_statement in &mut if_else_statement.else_ifs.0 {
+        gather_if_statement(if_statement, symbol_table, fqn_context, diagnostics);
+    }
+    if let Some(else_block) = &mut if_else_statement.else_block {
+        gather_block_statement(&mut else_block.0, symbol_table, fqn_context, diagnostics);
+    }
 }
 
 fn gather_while_statement(
@@ -837,7 +1122,13 @@ fn gather_while_statement(
     fqn_context: &mut FqnContext,
     diagnostics: &mut Vec<DmDiagnostic>,
 ) {
-    todo!()
+    gather_expression(&mut while_statement.condition, symbol_table, diagnostics);
+    gather_block_statement(
+        &mut while_statement.body,
+        symbol_table,
+        fqn_context,
+        diagnostics,
+    );
 }
 
 fn gather_for_statement(
@@ -846,7 +1137,37 @@ fn gather_for_statement(
     fqn_context: &mut FqnContext,
     diagnostics: &mut Vec<DmDiagnostic>,
 ) {
-    todo!()
+    gather_expression(&mut for_statement.iterator, symbol_table, diagnostics);
+    symbol_table.push_scope("ForStatementScope");
+    let variable_identifier = &mut for_statement.variable;
+    let insert_result = symbol_table.insert_variable_symbol(VariableSymbol::new(
+        &variable_identifier.name(),
+        false,
+        Some(variable_identifier),
+    ));
+
+    match insert_result {
+        Ok(_) => {
+            gather_block_statement_inner(
+                &mut for_statement.body,
+                symbol_table,
+                fqn_context,
+                diagnostics,
+            );
+        }
+        Err(insert_error) => {
+            handle_insert_error(
+                insert_error,
+                &variable_identifier.name(),
+                variable_identifier.file_id(),
+                variable_identifier.range(),
+                "variable",
+                diagnostics,
+            );
+        }
+    }
+
+    symbol_table.pop_scope();
 }
 
 /* Expressions */

src/name_analysis/resolve.rs

@@ -146,7 +146,9 @@ fn resolve_implements_list(
     symbol_table: &mut SymbolTable,
     diagnostics: &mut Vec<DmDiagnostic>,
 ) {
-    todo!()
+    for type_use in &mut implements_list.0 {
+        resolve_type_use(type_use, symbol_table, diagnostics);
+    }
 }
 
 /* Function parameters */
@@ -278,18 +280,23 @@ fn resolve_module_level_declaration(
 ) {
     use crate::ast::ModuleLevelDeclaration::*;
     match declaration {
+        Module(module_declaration) => {
+            resolve_module_declaration(module_declaration, symbol_table, diagnostics);
+        }
+        Interface(interface_declaration) => {
+            resolve_interface_declaration(interface_declaration, symbol_table, diagnostics);
+        }
         Function(function_definition) => {
             resolve_function_definition(function_definition, symbol_table, diagnostics)
         }
+        Class(class_declaration) => {
+            resolve_class_declaration(class_declaration, symbol_table, diagnostics);
+        }
         PlatformFunction(platform_function_declaration) => resolve_platform_function_declaration(
             platform_function_declaration,
             symbol_table,
             diagnostics,
         ),
-        Class(class_declaration) => {
-            // todo
-        }
-        _ => todo!(),
     }
 }
 
@@ -298,7 +305,32 @@ fn resolve_interface_level_declaration(
     symbol_table: &mut SymbolTable,
     diagnostics: &mut Vec<DmDiagnostic>,
 ) {
-    todo!()
+    use crate::ast::InterfaceLevelDeclaration::*;
+    match declaration {
+        Module(module_declaration) => {
+            resolve_module_declaration(module_declaration, symbol_table, diagnostics);
+        }
+        Interface(interface_declaration) => {
+            resolve_interface_declaration(interface_declaration, symbol_table, diagnostics);
+        }
+        Class(class_declaration) => {
+            resolve_class_declaration(class_declaration, symbol_table, diagnostics);
+        }
+        Function(interface_function_declaration) => {
+            resolve_interface_function_declaration(
+                interface_function_declaration,
+                symbol_table,
+                diagnostics,
+            );
+        }
+        OperatorFunction(interface_operator_function_declaration) => {
+            resolve_interface_operator_function_declaration(
+                interface_operator_function_declaration,
+                symbol_table,
+                diagnostics,
+            );
+        }
+    }
 }
 
 fn resolve_class_level_declaration(
@@ -306,7 +338,41 @@ fn resolve_class_level_declaration(
     symbol_table: &mut SymbolTable,
     diagnostics: &mut Vec<DmDiagnostic>,
 ) {
-    todo!()
+    use crate::ast::ClassLevelDeclaration::*;
+    match declaration {
+        Module(module_declaration) => {
+            resolve_module_declaration(module_declaration, symbol_table, diagnostics);
+        }
+        Interface(interface_declaration) => {
+            resolve_interface_declaration(interface_declaration, symbol_table, diagnostics);
+        }
+        Class(class_declaration) => {
+            resolve_class_declaration(class_declaration, symbol_table, diagnostics);
+        }
+        Function(function_definition) => {
+            resolve_function_definition(function_definition, symbol_table, diagnostics);
+        }
+        OperatorFunction(operator_function_definition) => {
+            resolve_operator_function_definition(
+                operator_function_definition,
+                symbol_table,
+                diagnostics,
+            );
+        }
+        PlatformFunction(platform_function_declaration) => {
+            resolve_platform_function_declaration(
+                platform_function_declaration,
+                symbol_table,
+                diagnostics,
+            );
+        }
+        Property(property_declaration) => {
+            resolve_property_declaration(property_declaration, symbol_table, diagnostics);
+        }
+        Field(field_declaration) => {
+            resolve_field_declaration(field_declaration, symbol_table, diagnostics);
+        }
+    }
 }
 
 /* Main Declarations */
@@ -400,7 +466,19 @@ fn resolve_interface_function_declaration(
     symbol_table: &mut SymbolTable,
     diagnostics: &mut Vec<DmDiagnostic>,
 ) {
-    todo!()
+    resolve_parameters(
+        &mut interface_function_declaration.parameters,
+        symbol_table,
+        diagnostics,
+    );
+    resolve_return_type(
+        &mut interface_function_declaration.return_type,
+        symbol_table,
+        diagnostics,
+    );
+    if let Some(body) = &mut interface_function_declaration.body {
+        resolve_function_body(body, symbol_table, diagnostics);
+    }
 }
 
 fn resolve_interface_operator_function_declaration(
@@ -439,7 +517,13 @@ fn resolve_class_constructor(
     symbol_table: &mut SymbolTable,
     diagnostics: &mut Vec<DmDiagnostic>,
 ) {
-    todo!()
+    use crate::ast::ClassConstructorParameter::*;
+    for parameter in &mut class_constructor.0 {
+        match parameter {
+            Property(property) => resolve_property_declaration(property, symbol_table, diagnostics),
+            Field(field) => resolve_field_declaration(field, symbol_table, diagnostics),
+        }
+    }
 }
 
 fn resolve_property_declaration(
@@ -447,7 +531,11 @@ fn resolve_property_declaration(
     symbol_table: &mut SymbolTable,
     diagnostics: &mut Vec<DmDiagnostic>,
 ) {
-    todo!()
+    resolve_type_use(
+        &mut property_declaration.declared_type,
+        symbol_table,
+        diagnostics,
+    );
 }
 
 fn resolve_field_declaration(
@@ -455,7 +543,11 @@ fn resolve_field_declaration(
     symbol_table: &mut SymbolTable,
     diagnostics: &mut Vec<DmDiagnostic>,
 ) {
-    todo!()
+    resolve_type_use(
+        &mut field_declaration.declared_type,
+        symbol_table,
+        diagnostics,
+    );
 }
 
 /* Statements */

src/name_analysis/symbol.rs

@@ -1,9 +1,10 @@
+use crate::ast::named::Named;
 use crate::ast::{Identifier, UseStatement};
 use std::cell::RefCell;
 use std::fmt::{Debug, Display, Formatter};
+use std::ops::Deref;
 use std::range::Range;
 use std::rc::Rc;
-use crate::ast::named::Named;
 
 #[derive(Clone, Debug)]
 pub struct SourceDefinition {
@@ -59,6 +60,7 @@ pub enum Symbol {
     Function(Rc<RefCell<FunctionSymbol>>),
     Parameter(Rc<ParameterSymbol>),
     Variable(Rc<VariableSymbol>),
+    ClassMember(Rc<ClassMemberSymbol>),
 }
 
 impl Symbol {
@@ -66,10 +68,14 @@ impl Symbol {
         match self {
             Symbol::UseStatement(s) => s.borrow().definition(),
             Symbol::Module(s) => s.definition(),
-            Symbol::Type(s) => s.definition(),
+            Symbol::Type(s) => match s.deref() {
+                TypeSymbol::Concrete(cts) => cts.definition(),
+                TypeSymbol::Generic(gts) => gts.definition(),
+            },
             Symbol::Function(s) => s.borrow().definition(),
             Symbol::Parameter(s) => s.definition(),
             Symbol::Variable(s) => s.definition(),
+            Symbol::ClassMember(s) => s.definition(),
         }
     }
 
@@ -180,21 +186,36 @@ impl Debug for ModuleSymbol {
 
 /* TypeSymbol */
 
-pub struct 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 TypeSymbol {
+impl ConcreteTypeSymbol {
     pub fn new(
         fqn: &str,
         declared_name: &str,
         is_public: bool,
         identifier: Option<&Identifier>,
     ) -> Self {
-        TypeSymbol {
+        ConcreteTypeSymbol {
             fqn: fqn.to_string(),
             declared_name: declared_name.to_string(),
             is_public,
@@ -211,7 +232,7 @@ impl TypeSymbol {
     }
 }
 
-impl SymbolInner for TypeSymbol {
+impl SymbolInner for ConcreteTypeSymbol {
     fn declared_name(&self) -> &str {
         &self.declared_name
     }
@@ -221,7 +242,7 @@ impl SymbolInner for TypeSymbol {
     }
 }
 
-impl Debug for TypeSymbol {
+impl Debug for ConcreteTypeSymbol {
     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
         f.debug_struct("TypeSymbol")
             .field("fqn", &self.fqn)
@@ -231,6 +252,38 @@ impl Debug for TypeSymbol {
     }
 }
 
+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 {
@@ -240,7 +293,7 @@ pub struct FunctionSymbol {
     is_platform: bool,
     definition: Option<SourceDefinition>,
     parameters: Vec<Rc<ParameterSymbol>>,
-    return_type: Option<Rc<TypeSymbol>>,
+    return_type: Option<Rc<ConcreteTypeSymbol>>,
 }
 
 impl FunctionSymbol {
@@ -277,7 +330,7 @@ impl FunctionSymbol {
         }
     }
 
-    pub fn with_return_type(self, return_type: TypeSymbol) -> Self {
+    pub fn with_return_type(self, return_type: ConcreteTypeSymbol) -> Self {
         Self {
             fqn: self.fqn,
             declared_name: self.declared_name,
@@ -297,7 +350,7 @@ impl FunctionSymbol {
         self.parameters = parameters;
     }
 
-    pub fn set_return_type(&mut self, return_type: Rc<TypeSymbol>) {
+    pub fn set_return_type(&mut self, return_type: Rc<ConcreteTypeSymbol>) {
         self.return_type = Some(return_type);
     }
 }
@@ -395,3 +448,39 @@ impl Debug for VariableSymbol {
             .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_table.rs

@@ -1,13 +1,12 @@
-use crate::name_analysis::symbol::{
-    FunctionSymbol, ModuleSymbol, ParameterSymbol, Symbol, SymbolInner, TypeSymbol,
-    UseStatementSymbol, VariableSymbol,
-};
+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)]
@@ -19,6 +18,7 @@ struct Scope {
     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,
 }
 
@@ -32,41 +32,11 @@ impl Scope {
             function_symbols: HashMap::new(),
             parameter_symbols: HashMap::new(),
             variable_symbols: HashMap::new(),
+            class_member_symbols: HashMap::new(),
             debug_name,
         }
     }
 
-    fn get_any_symbol(&self, name: &str) -> Option<Symbol> {
-        self.variable_symbols
-            .get(name)
-            .map(|s| Symbol::Variable(s.clone()))
-            .or_else(|| {
-                self.parameter_symbols
-                    .get(name)
-                    .map(|s| Symbol::Parameter(s.clone()))
-            })
-            .or_else(|| {
-                self.function_symbols
-                    .get(name)
-                    .map(|s| Symbol::Function(s.clone()))
-            })
-            .or_else(|| {
-                self.type_symbols
-                    .get(name)
-                    .map(|ts| Symbol::Type(ts.clone()))
-            })
-            .or_else(|| {
-                self.module_symbols
-                    .get(name)
-                    .map(|ms| Symbol::Module(ms.clone()))
-            })
-            .or_else(|| {
-                self.use_statement_symbols
-                    .get(name)
-                    .map(|us| Symbol::UseStatement(us.clone()))
-            })
-    }
-
     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 {
@@ -96,7 +66,13 @@ impl Scope {
     }
 
     fn get_type_symbol_by_fqn(&self, fqn: &str) -> Option<Rc<TypeSymbol>> {
-        self.type_symbols.values().find(|s| s.fqn() == fqn).cloned()
+        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> {
@@ -106,10 +82,15 @@ impl Scope {
             }
         }
         for type_symbol in self.type_symbols.values() {
-            if type_symbol.fqn() == fqn {
+            match type_symbol.deref() {
+                TypeSymbol::Concrete(concrete_type_symbol) => {
+                    if concrete_type_symbol.fqn() == fqn {
                         return Some(Symbol::Type(type_symbol.clone()));
                     }
                 }
+                _ => continue,
+            }
+        }
         None
     }
 
@@ -150,6 +131,11 @@ impl Scope {
                     .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)
@@ -173,9 +159,7 @@ impl Scope {
             .find(|fs| fs.borrow().fqn() == fqn)
             .map(|f| Symbol::Function(f.clone()))
             .or_else(|| {
-                self.type_symbols
-                    .values()
-                    .find(|ts| ts.fqn() == fqn)
+                self.get_type_symbol_by_fqn(fqn)
                     .map(|ts| Symbol::Type(ts.clone()))
             })
     }
@@ -342,20 +326,20 @@ impl SymbolTable {
         }
     }
     
-    #[deprecated(note = "Use more specific lookup methods.")]
-    pub fn lookup(&self, 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_any_symbol(name) {
-                return Ok(symbol);
-            }
-            scope_opt = if let Some(parent_id) = scope.parent {
-                Some(&self.scopes[parent_id])
+    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 {
-                None
-            };
+            current_scope.class_member_symbols.insert(
+                class_member_symbol.declared_name().to_string(),
+                Rc::new(class_member_symbol),
+            );
+            Ok(())
         }
-        Err(NoDefinition)
     }
 
     pub fn lookup_type_by_declared_name(
@@ -471,6 +455,9 @@ impl Display for SymbolTable {
             for symbol in scope.variable_symbols.values() {
                 writeln!(f, "{:#?}", symbol)?;
             }
+            for symbol in scope.class_member_symbols.values() {
+                writeln!(f, "{:#?}", symbol)?;
+            }
         }
         Ok(())
     }

src/std_core/mod.rs

@@ -1,4 +1,4 @@
-use crate::name_analysis::symbol::{FunctionSymbol, ParameterSymbol, TypeSymbol};
+use crate::name_analysis::symbol::{FunctionSymbol, ParameterSymbol};
 use crate::name_analysis::symbol_table::{SymbolInsertError, SymbolTable};
 
 pub fn add_std_core_symbols(symbol_table: &mut SymbolTable) -> Result<(), SymbolInsertError> {