Function arguments

generator.v

@@ -8,6 +8,10 @@ mut:
 	out strings.Builder
 }
 
+fn mangle_var(name string, scope_depth int) string {
+	return 'v${name}${scope_depth.str()}'
+}
+
 fn (mut g Generator) get_c_type(typ string) string {
 	c_type := if typ == 'real' { 'double' } else { typ }
 	return c_type
@@ -17,7 +21,7 @@ fn (mut g Generator) gen_stmt(stmt Stmt) {
 	match stmt {
 		VarDecl {
 			c_type := g.get_c_type(stmt.type)
-			g.out.write_string('${c_type} v${stmt.name}${stmt.scope_depth.str()} = ')
+			g.out.write_string('${c_type} ${mangle_var(stmt.name, stmt.scope_depth)} = ')
 			g.gen_expr(stmt.value)
 			g.out.writeln(';')
 		}
@@ -39,9 +43,20 @@ fn (mut g Generator) gen_stmt(stmt Stmt) {
 		}
 		FuncDecl {
 			c_type := g.get_c_type(stmt.ret_type)
-			g.out.write_string('${c_type} ${stmt.name}() ')
+			g.out.write_string('${c_type} ${stmt.name}(')
+			for param in stmt.params {
+				g.gen_stmt(param)
+				if param != stmt.params[stmt.params.len-1]{
+					g.out.write_string(', ')
+				}
+			}
+			g.out.write_string(')')
 			g.gen_stmt(stmt.block)
 		}
+		Param {
+			c_type := g.get_c_type(stmt.type)
+			g.out.write_string('${c_type} ${mangle_var(stmt.name, 2)}')
+		}
 	}
 }
 
@@ -57,7 +72,7 @@ fn (mut g Generator) gen_expr(expr Expr) {
 			g.out.write_string(expr.val.str())
 		}
 		Variable {
-			g.out.write_string('v${expr.name}${expr.scope_depth.str()}')
+			g.out.write_string(mangle_var(expr.name, expr.scope_depth))
 		}
 		UnaryExpr {
 			g.out.write_string('${expr.ident}${expr.op}')
@@ -91,7 +106,14 @@ fn (mut g Generator) gen_expr(expr Expr) {
 			g.out.write_string(')')
 		}
 		FnCall {
-			g.out.write_string('${expr.name}()')
+			g.out.write_string('${expr.name}(')
+			for arg in expr.args {
+				g.gen_expr(arg)
+				if arg != expr.args[expr.args.len-1]{
+					g.out.write_string(', ')
+				}
+			}
+			g.out.write_string(')')
 		}
 		else {panic("Unimplemented expression")}
 	}

parser.v

@@ -147,11 +147,12 @@ struct PrintExpr {
 
 struct FnCall {
 	name string
+	args []Expr
 }
 
 // ------------------------------------------- Statements
 
-type Stmt = VarDecl | ExprStmt | ReturnStmt | Block | FuncDecl
+type Stmt = VarDecl | ExprStmt | ReturnStmt | Block | FuncDecl | Param
 
 struct VarDecl {
 	name string
@@ -162,6 +163,7 @@ struct VarDecl {
 
 struct FuncDecl {
 	name string
+	params []Param
 	ret_type string
 	block Block
 }
@@ -178,6 +180,11 @@ struct Block {
 	stmts []Stmt
 }
 
+struct Param {
+	name string
+	type string
+}
+
 // ------------------------------------------- Parser
 
 struct Parser {
@@ -185,6 +192,7 @@ struct Parser {
 mut:
 	symbols SymbolTable
 	pos int
+	line int
 	statements []Stmt
 }
 
@@ -223,7 +231,7 @@ fn (mut p Parser) dump_stmt() {
 
 @[noreturn]
 fn parse_error(str string) {
-	eprintln(term.red("Parse Error: " + str))
+	eprintln(term.red("Parse Error: ${str}"))
 	panic("")
 }
 
@@ -259,16 +267,29 @@ fn (mut p Parser) parse_expr(prec Precedence) Expr {
 }
 
 fn (mut p Parser) parse_ident(ident string) Expr {
-	expr := match p.peek().type {
-		.increment, .decrement {Expr(UnaryExpr {ident: ident, op: p.next().text})}
-		.lparen {
-			p.expect(.lparen)
-			p.expect(.rparen)
-			FnCall{name: ident}
-			}
+	return match p.peek().type {
+		.increment, .decrement {UnaryExpr {ident: ident, op: p.next().text}}
+		.lparen {p.parse_call(ident)}
 		else {Variable{ident, p.symbols.variable_scopes.len}}
 	}
-	return expr
+}
+
+fn (mut p Parser) parse_call(name string) FnCall {
+	p.expect(.lparen)
+		mut args := []Expr{}
+
+	if p.peek().type != .rparen {
+		for {
+			args << p.parse_expr(.lowest)
+				if p.peek().type == .comma {
+					p.next()
+				} else {
+					break
+				}
+		}
+	}
+	p.expect(.rparen)
+	return FnCall{name: name, args: args}
 }
 
 fn (mut p Parser) parse_print() PrintExpr {
@@ -317,7 +338,7 @@ fn (mut p Parser) check_binary_expr_types(expr BinaryExpr) {
 	left_t := p.get_expr_type(expr.left)
 	right_t := p.get_expr_type(expr.right)
 	if left_t != right_t {
-		parse_error ('Type mismatch in expression: ${left_t} and ${right_t}')
+		parse_error('Type mismatch in expression: ${left_t} and ${right_t}')
 	}
 }
 
@@ -439,6 +460,28 @@ fn (mut p Parser) parse_func_decl() FuncDecl {
 	}
 
 	p.expect(.lparen)
+
+	mut params := []Param{}
+
+	p.symbols.variable_scopes << map[string]VarSymbolInfo{}
+
+	if p.peek().type != .rparen {
+		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
+			params << Param{p_name, p_type}
+			p.symbols.define_var(p_name, p_type)
+
+			if p.peek().type == .comma {
+				p.next()
+			} else {
+				break
+			}
+		}
+	}
+
 	p.expect(.rparen)
 
 	p.dump_token()
@@ -448,7 +491,6 @@ fn (mut p Parser) parse_func_decl() FuncDecl {
 		parse_error("Expected function return type after name when declaring ${name_tok.text}")
 	}
 
-	p.symbols.variable_scopes << map[string]VarSymbolInfo{}
 	block := p.parse_block(true)
 
 	return_stmts := p.get_return_stmts_recursive(block)
@@ -468,26 +510,17 @@ fn (mut p Parser) parse_func_decl() FuncDecl {
 		name: name_tok.text
 		ret_type: type_tok.text
 		block: block
+		params: params
 	}
 }
 
 fn (mut p Parser) parse_return_stmt() ReturnStmt {
 	p.expect(.kw_return)
 
-	token := p.peek()
-	mut expr := Expr{}
-	expr = match token.type {
-		.integer    {IntegerLiteral{token.text.int()}}
-		.real       {RealLiteral{token.text.f32()}}
-		.boolean    {BoolLiteral{token.text == 'true'}}
-		.identifier {Variable{token.text, p.symbols.variable_scopes.len}}
-		.semicolon  {VoidExpr{}}
-		else {parse_error("Unexpected Token")}
-	}
+	expr := p.parse_expr(.lowest)
+
 	p.next()
-	if !(expr is VoidExpr) {
-		p.expect(.semicolon)
-	}
+
 	return ReturnStmt {
 		expr: expr
 	}