structs

generator.v

@@ -9,7 +9,21 @@ mut:
 }
 
 fn mangle_var(name string) string {
-	return 'v${name}'
+	return 'one_v${name}'
+}
+
+fn mangle_func(name string) string {
+	if name == 'main' {return 'main'}
+	return 'one_f${name}'
+}
+
+fn mangle_struct(name string) string {
+	return 'one_s${name}_'
+}
+
+fn mangle_if_struct_type(name string) string {
+	if name[0..6] != 'struct' {return name}
+	return 'struct ${mangle_struct(name[7..])}'
 }
 
 fn (mut g Generator) get_c_type(typ string) string {
@@ -23,7 +37,7 @@ fn (mut g Generator) get_c_type(typ string) string {
 fn (mut g Generator) gen_stmt(stmt Stmt) {
 	match stmt {
 		VarDecl {
-			c_type := g.get_c_type(stmt.type)
+			c_type := mangle_if_struct_type(g.get_c_type(stmt.type))
 			if stmt.const {
 				g.out.write_string('const ')
 			}
@@ -49,7 +63,7 @@ fn (mut g Generator) gen_stmt(stmt Stmt) {
 		}
 		FuncDecl {
 			c_type := g.get_c_type(stmt.ret_type)
-			g.out.write_string('${c_type} ${stmt.name}(')
+			g.out.write_string('${c_type} ${mangle_func(stmt.name)}(')
 			for param in stmt.params {
 				g.gen_stmt(param)
 				if param != stmt.params[stmt.params.len-1]{
@@ -63,6 +77,14 @@ fn (mut g Generator) gen_stmt(stmt Stmt) {
 			c_type := g.get_c_type(stmt.type)
 			g.out.write_string('${c_type} ${mangle_var(stmt.name)}')
 		}
+		StructDecl {
+			g.out.writeln('struct ${mangle_struct(stmt.name)} {')
+			for member in stmt.members {
+				g.gen_expr(member)
+				g.out.writeln(';')
+			}
+			g.out.writeln('};')
+		}
 	}
 }
 
@@ -113,7 +135,7 @@ fn (mut g Generator) gen_expr(expr Expr) {
 			g.out.write_string(')')
 		}
 		FnCall {
-			g.out.write_string('${expr.name}(')
+			g.out.write_string('${mangle_func(expr.name)}(')
 			for arg in expr.args {
 				g.gen_expr(arg)
 				if arg != expr.args[expr.args.len-1]{
@@ -122,6 +144,20 @@ fn (mut g Generator) gen_expr(expr Expr) {
 			}
 			g.out.write_string(')')
 		}
+		StructMember {
+			c_type := g.get_c_type(expr.type)
+			g.out.write_string('${c_type} ${expr.name}')
+		}
+		StructInstantiation {
+			g.out.write_string('(struct ${mangle_struct(expr.name)}){')
+			for m_expr in expr.member_values {
+				g.gen_expr(m_expr)
+				if m_expr != expr.member_values[expr.member_values.len - 1] {
+					g.out.write_string(', ')
+				}
+			}
+			g.out.write_string('}')
+		}
 		else {panic("Unimplemented expression")}
 	}
 }
@@ -138,21 +174,25 @@ fn (mut g Generator) gen_c(program []Stmt) string {
 
 }
 
-fn compile_with_clang(c_code string, output_name string, keep_c bool) {
+fn compile(c_code string, output_name string, keep_c bool, compiler string) {
     c_file := 'middle_c.c'
     os.write_file(c_file, c_code) or {
         eprintln('Failed to write C file: $err')
         return
     }
 
-    clang_cmd := 'clang ${c_file} -o ${output_name} -O2'
+    cmd := match compiler {
+			'clang' {'clang ${c_file} -o ${output_name} -O2'}
+			'gcc'   {'gcc ${c_file} -o ${output_name} -O2'}
+			else    {panic("Invalid compiler")}
+		}
 
-    println('Executing: ${clang_cmd}')
+    println('Executing: ${cmd}')
 
-    result := os.execute(clang_cmd)
+    result := os.execute(cmd)
 
     if result.exit_code != 0 {
-        eprintln('Clang Compilation Failed:')
+        eprintln('${compiler} Compilation Failed:')
         eprintln(result.output)
     } else {
         println('Compilation successful! Binary created: $output_name')

lexer.v

@@ -13,6 +13,7 @@ enum TokenType as u8 {
 	kw_fn
 	kw_return
 	kw_print
+	kw_struct
 	integer
 	real
 	boolean
@@ -103,6 +104,7 @@ fn toktype_from_kw(kw string) TokenType {
 		'return' {.kw_return}
 		'true', 'false' {.boolean}
 		'print' {.kw_print}
+		'struct' {.kw_struct}
 		else {.unknown}
 	}
 }
@@ -118,7 +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"
+		"void", "int", "real", "bool", "if", "else", "for", "break", "fn", "return", "let", "const", "true", "false", "print", "struct"
 	].contains(str)
 }
 

main.v

@@ -31,6 +31,6 @@ fn main() {
 
 	out_c := generator.gen_c(statements)
 
-	compile_with_clang(out_c, 'exec', true)
+	compile(out_c, 'exec', true, 'gcc')
 
 }

parser.v

@@ -26,7 +26,7 @@ fn (p Parser) get_precedence(tok_type TokenType) Precedence {
 
 // ------------------------------------------- Symbol Table
 
-type SymbolInfo = VarSymbolInfo | FuncSymbolInfo
+type SymbolInfo = VarSymbolInfo | FuncSymbolInfo | StructTypeSymbolInfo
 
 struct VarSymbolInfo {
 	type string
@@ -37,10 +37,15 @@ struct FuncSymbolInfo {
 	block Block
 }
 
+struct StructTypeSymbolInfo {
+	name string
+}
+
 struct SymbolTable {
 mut:
 	variable_scopes []map[string]VarSymbolInfo
 	functions map[string]FuncSymbolInfo
+	structs map[string]StructTypeSymbolInfo
 }
 
 fn (mut s SymbolTable) define_var(name string, typ string) {
@@ -85,13 +90,25 @@ 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) lookup_struct_type(name string) ?StructTypeSymbolInfo {
+	if name in s.structs {
+		return s.structs[name]
+	}
+	return none
+}
+
 fn (mut s SymbolTable) is_in_global_scope() bool {
 	return s.variable_scopes.len == 1
 }
 
+
 // ------------------------------------------- Expressions
 
-type Expr = VoidExpr | UnaryExpr | BinaryExpr | IntegerLiteral | RealLiteral | BoolLiteral | Variable | TypeExpr | Function | TypeCast | ParenExpr | PrintExpr | FnCall
+type Expr = VoidExpr | UnaryExpr | BinaryExpr | IntegerLiteral | RealLiteral | BoolLiteral | Variable | TypeExpr | Function | TypeCast | ParenExpr | PrintExpr | FnCall | StructMember | StructInstantiation
 
 struct VoidExpr {}
 
@@ -126,6 +143,16 @@ struct TypeExpr {
 	name string
 }
 
+struct StructMember {
+	name string
+	type string
+}
+
+struct StructInstantiation {
+	name string
+	member_values []Expr
+}
+
 struct Function {
 	name string
 }
@@ -151,7 +178,7 @@ struct FnCall {
 
 // ------------------------------------------- Statements
 
-type Stmt = VarDecl | ExprStmt | ReturnStmt | Block | FuncDecl | Param
+type Stmt = VarDecl | ExprStmt | ReturnStmt | Block | FuncDecl | Param | StructDecl
 
 struct VarDecl {
 	name string
@@ -167,6 +194,11 @@ struct FuncDecl {
 	block Block
 }
 
+struct StructDecl {
+	name string
+	members []StructMember
+}
+
 struct ExprStmt {
 	expr Expr
 }
@@ -193,6 +225,7 @@ mut:
 	pos int
 	line int
 	statements []Stmt
+	inside_struct bool
 }
 
 fn (mut p Parser) peek() Token {
@@ -266,6 +299,17 @@ 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 {
+		return match p.peek().type {
+			.lbracket {p.parse_struct_inst(ident)}
+			else {p.parse_type('struct ${ident}')}
+		}
+	}
+
+	if p.inside_struct {
+		return p.parse_struct_member(ident)
+	}
+
 	return match p.peek().type {
 		.increment, .decrement {UnaryExpr {ident: ident, op: p.next().text}}
 		.lparen {p.parse_call(ident)}
@@ -273,6 +317,36 @@ fn (mut p Parser) parse_ident(ident string) Expr {
 	}
 }
 
+fn (mut p Parser) parse_struct_member(name string) StructMember {
+	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 := p.peek().text
+	p.expect(.type)
+	p.expect(.semicolon)
+	return StructMember{name: name, type: type}
+}
+
+fn (mut p Parser) parse_struct_inst(name string) StructInstantiation {
+	p.expect(.lbracket)
+	mut member_values := []Expr{}
+
+	if p.peek().type != .rbracket {
+		for {
+			member_values << p.parse_expr(.lowest)
+			if p.peek().type == .comma {
+				p.next()
+			} else {
+				break
+			}
+		}
+	}
+	p.expect(.rbracket)
+	return StructInstantiation{name: name, member_values: member_values}
+}
+
 fn (mut p Parser) parse_call(name string) FnCall {
 	p.expect(.lparen)
 		mut args := []Expr{}
@@ -369,10 +443,9 @@ 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}
 		else {"Tried getting type of unexpected Expr"}
 	}
-
-
 }
 
 fn (mut p Parser) is_op_valid_for_type(type string, op string) bool {
@@ -408,12 +481,11 @@ fn (mut p Parser) parse_statement() Stmt {
 			.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()}
 			else       {return p.parse_expr_stmt()}
 		}
 }
 
-
-
 fn (mut p Parser) parse_var_decl(is_const bool) VarDecl {
 	p.next()
 
@@ -423,9 +495,16 @@ fn (mut p Parser) parse_var_decl(is_const bool) VarDecl {
 	}
 
 	type_tok := p.next()
-	if type_tok.type != .type {
+	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}")
 				}
+				'struct ${type_tok.text}'
+			}
+		else{parse_error("Expected variable type after name when declaring ${name_tok.text}")}
+	}
 
 	p.expect(.equals)
 	val := p.parse_expr(.lowest)
@@ -443,7 +522,7 @@ fn (mut p Parser) parse_var_decl(is_const bool) VarDecl {
 	return VarDecl {
 		name: name_tok.text
 		value: val
-		type: type_tok.text
+		type: type_name
 		const: is_const
 	}
 }
@@ -514,6 +593,20 @@ fn (mut p Parser) parse_func_decl() FuncDecl {
 	}
 }
 
+fn (mut p Parser) parse_struct() StructDecl {
+	p.expect(.kw_struct)
+	name := p.peek().text
+	p.expect(.identifier)
+	p.expect(.lbracket)
+	mut members := []StructMember{}
+	for p.peek().type == .identifier {
+		members << p.parse_struct_member(p.peek().text)
+	}
+	p.expect(.rbracket)
+	p.symbols.define_struct_type(name)
+	return StructDecl{name: name, members: members}
+}
+
 fn (mut p Parser) parse_return_stmt() ReturnStmt {
 	p.expect(.kw_return)