From 5af769acc293e561929337ae3715b8f9f9b31e4e Mon Sep 17 00:00:00 2001
From: uan <fspinardi08@gmail.com>
Date: Thu, 5 Feb 2026 19:40:59 +0100
Subject: [PATCH] struct -> class

---
 generator.v |  23 +++++------
 lexer.v     |   6 +--
 main.v      |   2 +-
 parser.v    | 111 +++++++++++++++++++++++++++++++++-------------------
 4 files changed, 86 insertions(+), 56 deletions(-)

diff --git a/generator.v b/generator.v
index 4ef2b7f..92d9872 100644
--- a/generator.v
+++ b/generator.v
@@ -9,20 +9,20 @@ mut:
 }
 
 fn mangle_var(name string) string {
-	return 'one_v${name}'
+	return 'one_var_${name}'
 }
 
 fn mangle_func(name string) string {
 	if name == 'main' {return 'main'}
-	return 'one_f${name}'
+	return 'one_func_${name}'
 }
 
 fn mangle_struct(name string) string {
-	return 'one_s${name}_'
+	return 'one_class_${name}_'
 }
 
 fn mangle_if_struct_type(name string) string {
-	if name[0..6] != 'struct' {return name}
+	if name.len < 7 || name[0..6] != 'struct' {return name}
 	return 'struct ${mangle_struct(name[7..])}'
 }
 
@@ -62,7 +62,8 @@ fn (mut g Generator) gen_stmt(stmt Stmt) {
 			g.out.writeln('}')
 		}
 		FuncDecl {
-			c_type := g.get_c_type(stmt.ret_type)
+			dump(stmt.ret_type)
+			c_type := mangle_if_struct_type(g.get_c_type(stmt.ret_type))
 			g.out.write_string('${c_type} ${mangle_func(stmt.name)}(')
 			for param in stmt.params {
 				g.gen_stmt(param)
@@ -74,10 +75,10 @@ fn (mut g Generator) gen_stmt(stmt Stmt) {
 			g.gen_stmt(stmt.block)
 		}
 		Param {
-			c_type := g.get_c_type(stmt.type)
+			c_type := mangle_if_struct_type(g.get_c_type(stmt.type))
 			g.out.write_string('${c_type} ${mangle_var(stmt.name)}')
 		}
-		StructDecl {
+		ClassDecl {
 			g.out.writeln('struct ${mangle_struct(stmt.name)} {')
 			for member in stmt.members {
 				g.gen_expr(member)
@@ -124,7 +125,7 @@ fn (mut g Generator) gen_expr(expr Expr) {
 			g.out.write_string(')')
 		}
 		TypeCast {
-			c_type := g.get_c_type(expr.type)
+			c_type := mangle_if_struct_type(g.get_c_type(expr.type))
 			g.out.write_string('((${c_type})')
 			g.gen_expr(expr.expr)
 			g.out.write_string(')')
@@ -144,11 +145,11 @@ fn (mut g Generator) gen_expr(expr Expr) {
 			}
 			g.out.write_string(')')
 		}
-		StructMember {
-			c_type := g.get_c_type(expr.type)
+		ClassMember {
+			c_type := mangle_if_struct_type(g.get_c_type(expr.type))
 			g.out.write_string('${c_type} ${expr.name}')
 		}
-		StructInstantiation {
+		ClassInstantiation {
 			g.out.write_string('(struct ${mangle_struct(expr.name)}){')
 			for m_expr in expr.member_values {
 				g.gen_expr(m_expr)
diff --git a/lexer.v b/lexer.v
index a6edacc..01a9ede 100644
--- a/lexer.v
+++ b/lexer.v
@@ -13,7 +13,7 @@ enum TokenType as u8 {
 	kw_fn
 	kw_return
 	kw_print
-	kw_struct
+	kw_class
 	integer
 	real
 	boolean
@@ -104,7 +104,7 @@ fn toktype_from_kw(kw string) TokenType {
 		'return' {.kw_return}
 		'true', 'false' {.boolean}
 		'print' {.kw_print}
-		'struct' {.kw_struct}
+		'class' {.kw_class}
 		else {.unknown}
 	}
 }
@@ -120,7 +120,7 @@ fn is_real(str string) bool {
 
 fn is_keyword(str string) bool {
 	return [
-		"void", "int", "real", "bool", "if", "else", "for", "break", "fn", "return", "let", "const", "true", "false", "print", "struct"
+		"void", "int", "real", "bool", "if", "else", "for", "break", "fn", "return", "let", "const", "true", "false", "print", "class"
 	].contains(str)
 }
 
diff --git a/main.v b/main.v
index cd1e5c4..12bd216 100644
--- a/main.v
+++ b/main.v
@@ -31,6 +31,6 @@ fn main() {
 
 	out_c := generator.gen_c(statements)
 
-	compile(out_c, 'exec', true, 'gcc')
+	compile(out_c, 'exec', true, 'clang')
 
 }
diff --git a/parser.v b/parser.v
index 8ad03df..90bf666 100644
--- a/parser.v
+++ b/parser.v
@@ -26,7 +26,7 @@ fn (p Parser) get_precedence(tok_type TokenType) Precedence {
 
 // ------------------------------------------- Symbol Table
 
-type SymbolInfo = VarSymbolInfo | FuncSymbolInfo | StructTypeSymbolInfo
+type SymbolInfo = VarSymbolInfo | FuncSymbolInfo | ClassSymbolInfo
 
 struct VarSymbolInfo {
 	type string
@@ -37,7 +37,7 @@ struct FuncSymbolInfo {
 	block Block
 }
 
-struct StructTypeSymbolInfo {
+struct ClassSymbolInfo {
 	name string
 }
 
@@ -45,7 +45,7 @@ struct SymbolTable {
 mut:
 	variable_scopes []map[string]VarSymbolInfo
 	functions map[string]FuncSymbolInfo
-	structs map[string]StructTypeSymbolInfo
+	structs map[string]ClassSymbolInfo
 }
 
 fn (mut s SymbolTable) define_var(name string, typ string) {
@@ -90,11 +90,11 @@ fn (mut s SymbolTable) lookup_func(name string) ?FuncSymbolInfo {
 	return none
 }
 
-fn (mut s SymbolTable) define_struct_type(name string) {
-	s.structs[name] = StructTypeSymbolInfo{name: name}
+fn (mut s SymbolTable) define_class(name string) {
+	s.structs[name] = ClassSymbolInfo{name: name}
 }
 
-fn (mut s SymbolTable) lookup_struct_type(name string) ?StructTypeSymbolInfo {
+fn (mut s SymbolTable) lookup_class(name string) ?ClassSymbolInfo {
 	if name in s.structs {
 		return s.structs[name]
 	}
@@ -108,7 +108,7 @@ fn (mut s SymbolTable) is_in_global_scope() bool {
 
 // ------------------------------------------- Expressions
 
-type Expr = VoidExpr | UnaryExpr | BinaryExpr | IntegerLiteral | RealLiteral | BoolLiteral | Variable | TypeExpr | Function | TypeCast | ParenExpr | PrintExpr | FnCall | StructMember | StructInstantiation
+type Expr = VoidExpr | UnaryExpr | BinaryExpr | IntegerLiteral | RealLiteral | BoolLiteral | Variable | TypeExpr | Function | TypeCast | ParenExpr | PrintExpr | FnCall | ClassMember | ClassInstantiation
 
 struct VoidExpr {}
 
@@ -143,12 +143,12 @@ struct TypeExpr {
 	name string
 }
 
-struct StructMember {
+struct ClassMember {
 	name string
 	type string
 }
 
-struct StructInstantiation {
+struct ClassInstantiation {
 	name string
 	member_values []Expr
 }
@@ -178,7 +178,7 @@ struct FnCall {
 
 // ------------------------------------------- Statements
 
-type Stmt = VarDecl | ExprStmt | ReturnStmt | Block | FuncDecl | Param | StructDecl
+type Stmt = VarDecl | ExprStmt | ReturnStmt | Block | FuncDecl | Param | ClassDecl
 
 struct VarDecl {
 	name string
@@ -194,9 +194,9 @@ struct FuncDecl {
 	block Block
 }
 
-struct StructDecl {
+struct ClassDecl {
 	name string
-	members []StructMember
+	members []ClassMember
 }
 
 struct ExprStmt {
@@ -245,6 +245,11 @@ fn (mut p Parser) expect(type TokenType) {
 	p.next()
 }
 
+
+fn (mut p Parser) expect_ident_is_class(ident string) {
+	if !p.is_ident_class(ident) {panic("Expected type or class type but got identifier")}
+}
+
 // ------------------------------------------- Debug
 
 fn (mut p Parser) dump_token() {
@@ -299,15 +304,15 @@ fn (mut p Parser) parse_expr(prec Precedence) Expr {
 }
 
 fn (mut p Parser) parse_ident(ident string) Expr {
-	if p.symbols.lookup_struct_type(ident) != none {
+	if p.symbols.lookup_class(ident) != none {
 		return match p.peek().type {
-			.lbracket {p.parse_struct_inst(ident)}
+			.lbracket {p.parse_class_inst(ident)}
 			else {p.parse_type('struct ${ident}')}
 		}
 	}
 
 	if p.inside_struct {
-		return p.parse_struct_member(ident)
+		return p.parse_class_member(ident)
 	}
 
 	return match p.peek().type {
@@ -317,19 +322,25 @@ fn (mut p Parser) parse_ident(ident string) Expr {
 	}
 }
 
-fn (mut p Parser) parse_struct_member(name string) StructMember {
+fn (mut p Parser) parse_class_member(name string) ClassMember {
 	p.expect(.identifier)
-	if p.peek().type != .type {
-		dump(p.peek())
-		parse_error("Expected type after struct member ${name} in declaration, got ${p.peek().type}")
+
+	type_tok := p.peek()
+	type_name := match type_tok.type {
+		.type {type_tok.text}
+		.identifier {
+				p.expect_ident_is_class(type_tok.text)
+				'struct ${type_tok.text}'
+			}
+		else{parse_error("Expected type after class member ${name} in declaration, got ${p.peek().type}")}
 	}
-	type := p.peek().text
-	p.expect(.type)
+
+	p.next()
 	p.expect(.semicolon)
-	return StructMember{name: name, type: type}
+	return ClassMember{name: name, type: type_name}
 }
 
-fn (mut p Parser) parse_struct_inst(name string) StructInstantiation {
+fn (mut p Parser) parse_class_inst(name string) ClassInstantiation {
 	p.expect(.lbracket)
 	mut member_values := []Expr{}
 
@@ -344,7 +355,7 @@ fn (mut p Parser) parse_struct_inst(name string) StructInstantiation {
 		}
 	}
 	p.expect(.rbracket)
-	return StructInstantiation{name: name, member_values: member_values}
+	return ClassInstantiation{name: name, member_values: member_values}
 }
 
 fn (mut p Parser) parse_call(name string) FnCall {
@@ -415,6 +426,10 @@ fn (mut p Parser) check_binary_expr_types(expr BinaryExpr) {
 	}
 }
 
+fn (mut p Parser) is_ident_class(ident string) bool {
+	return p.symbols.lookup_class(ident) != none
+}
+
 fn (mut p Parser) get_expr_type(expr Expr) string {
 	return match expr {
 		ParenExpr      {p.get_expr_type(expr.expr)}
@@ -422,6 +437,7 @@ fn (mut p Parser) get_expr_type(expr Expr) string {
 		RealLiteral    {'real'}
 		BoolLiteral    {'bool'}
 		VoidExpr       {'void'}
+		TypeExpr       {expr.name}
 		BinaryExpr     {
 			p.check_binary_expr_types(expr)
 			left_t := p.get_expr_type(expr.left)
@@ -443,7 +459,7 @@ fn (mut p Parser) get_expr_type(expr Expr) string {
 			fninfo := p.symbols.lookup_func(expr.name) or {parse_error("Tried to call undefined function ${expr.name}")}
 			fninfo.type
 		}
-		StructInstantiation {expr.name}
+		ClassInstantiation {expr.name}
 		else {"Tried getting type of unexpected Expr"}
 	}
 }
@@ -477,11 +493,11 @@ fn (mut p Parser) get_return_stmts_recursive(block Block) []ReturnStmt {
 fn (mut p Parser) parse_statement() Stmt {
 		match p.peek().type {
 			.kw_let    {return p.parse_var_decl(false)}
-			.kw_const    {return p.parse_var_decl(true)}
+			.kw_const  {return p.parse_var_decl(true)}
 			.kw_return {return p.parse_return_stmt()}
 			.kw_fn     {return p.parse_func_decl()}
 			.lbracket  {return p.parse_block(false)}
-			.kw_struct {return p.parse_struct()}
+			.kw_class  {return p.parse_class()}
 			else       {return p.parse_expr_stmt()}
 		}
 }
@@ -498,9 +514,7 @@ fn (mut p Parser) parse_var_decl(is_const bool) VarDecl {
 	type_name := match type_tok.type {
 		.type {type_tok.text}
 		.identifier {
-				if p.symbols.lookup_struct_type(type_tok.text) == none {
-					parse_error("Expected variable type after name when declaring ${name_tok.text}")
-				}
+				p.expect_ident_is_class(type_tok.text)
 				'struct ${type_tok.text}'
 			}
 		else{parse_error("Expected variable type after name when declaring ${name_tok.text}")}
@@ -548,8 +562,18 @@ fn (mut p Parser) parse_func_decl() FuncDecl {
 		for {
 			if p.peek().type != .identifier {parse_error("Invalid syntax to declare function arguments! use f(myint int, myreal real)")}
 			p_name := p.next().text
-			if p.peek().type != .type {parse_error("Invalid syntax to declare function arguments! use f(myint int, myreal real)")}
-			p_type := p.next().text
+			//if p.peek().type != .type {parse_error("Invalid syntax to declare function arguments! use f(myint int, myreal real)")}
+
+			type_tok := p.peek()
+			p_type := match type_tok.type {
+				.type {type_tok.text}
+				.identifier {
+						p.expect_ident_is_class(type_tok.text)
+						'struct ${type_tok.text}'
+					}
+				else{parse_error("Expected argument type after name when declaring ${p_name}")}
+			}
+			p.next()
 			params << Param{p_name, p_type}
 			p.symbols.define_var(p_name, p_type)
 
@@ -566,8 +590,13 @@ fn (mut p Parser) parse_func_decl() FuncDecl {
 	p.dump_token()
 
 	type_tok := p.next()
-	if type_tok.type != .type {
-		parse_error("Expected function return type after name when declaring ${name_tok.text}")
+	ret_type := match type_tok.type {
+		.type {type_tok.text}
+		.identifier {
+			p.expect_ident_is_class(type_tok.text)
+				'struct ${type_tok.text}'
+			}
+			else{parse_error("Expected function return type after name when declaring ${name_tok.text}")}
 	}
 
 	block := p.parse_block(true)
@@ -587,24 +616,24 @@ fn (mut p Parser) parse_func_decl() FuncDecl {
 
 	return FuncDecl {
 		name: name_tok.text
-		ret_type: type_tok.text
+		ret_type: ret_type
 		block: block
 		params: params
 	}
 }
 
-fn (mut p Parser) parse_struct() StructDecl {
-	p.expect(.kw_struct)
+fn (mut p Parser) parse_class() ClassDecl {
+	p.expect(.kw_class)
 	name := p.peek().text
 	p.expect(.identifier)
 	p.expect(.lbracket)
-	mut members := []StructMember{}
+	mut members := []ClassMember{}
 	for p.peek().type == .identifier {
-		members << p.parse_struct_member(p.peek().text)
+		members << p.parse_class_member(p.peek().text)
 	}
 	p.expect(.rbracket)
-	p.symbols.define_struct_type(name)
-	return StructDecl{name: name, members: members}
+	p.symbols.define_class(name)
+	return ClassDecl{name: name, members: members}
 }
 
 fn (mut p Parser) parse_return_stmt() ReturnStmt {