checker: check enums

vlib/v/ast/ast.v

@@ -397,7 +397,10 @@ pub:
 
 pub struct EnumVal {
 pub:
-	name string
+	enum_name string
+	val       string
+	pos       token.Position
+	// name string
 }
 
 pub struct EnumDecl {

vlib/v/checker/checker.v

@@ -57,7 +57,7 @@ pub fn (c mut Checker) check_files(ast_files []ast.File) {
 					c.stmt(*it)
 				}
 				else {}
-			}
+	}
 		}
 	}
 	for file in ast_files {
@@ -316,7 +316,6 @@ fn (c mut Checker) stmt(node ast.Stmt) {
 				mut field := it.fields[i]
 				typ := c.expr(expr)
 				mut xconst := c.table.consts[field.name]
-
 				// if xconst.typ == 0 {
 				xconst.typ = typ
 				c.table.consts[field.name] = xconst
@@ -366,6 +365,17 @@ pub fn (c mut Checker) expr(node ast.Expr) table.Type {
 		ast.AssignExpr {
 			c.check_assign_expr(it)
 		}
+		ast.EnumVal {
+			typ_idx := c.table.find_type_idx(it.enum_name) // or {
+			typ := c.table.find_type(it.enum_name) or {
+				panic(err)
+			}
+			info := typ.info as table.Enum
+			if !(it.val in info.vals) {
+				c.error('enum `$it.enum_name` does not have a value `$it.val`', it.pos)
+			}
+			return typ_idx
+		}
 		ast.FloatLiteral {
 			return table.f64_type
 		}

vlib/v/gen/cgen.v

@@ -226,6 +226,9 @@ fn (g mut Gen) expr(node ast.Expr) {
 		ast.BoolLiteral {
 			g.write(it.val.str())
 		}
+		ast.EnumVal {
+			g.write('${it.enum_name}_$it.val')
+		}
 		ast.IntegerLiteral {
 			g.write(it.val.str())
 		}

vlib/v/gen/tests/1.c

@@ -31,6 +31,7 @@ int main() {
 	foo(3);
 	int ak = 10;
 	int mypi = pi;
+	Color color = Color_red;
 	return 0;
 }
 

vlib/v/gen/tests/1.vv

@@ -37,8 +37,7 @@ fn main() {
 	foo(3)
 	ak := 10
 	mypi := pi
-	//color := Color.red
-	//Color color = Color_red;
+	color := Color.red
 }
 	/*
 	user := User{}

vlib/v/parser/parser.v

@@ -577,12 +577,16 @@ pub fn (p mut Parser) name_expr() ast.Expr {
 		// || p.table.known_type(p.tok.lit)) {
 		return p.struct_init()
 	}
-	/*
-	else if p.peek_tok.kind == .dot {
-		p.warn('enum val $name')
+	else if p.peek_tok.kind == .dot && p.tok.lit[0].is_capital() {
+		enum_name := p.check_name()
+		p.check(.dot)
+		val := p.check_name()
+		// println('enum val $enum_name . $val')
+		return ast.EnumVal{
+			enum_name: enum_name
+			val: val
+		}
 	}
-	*/
-
 	else {
 		mut ident := ast.Ident{}
 		ident = p.parse_ident(is_c)
@@ -907,10 +911,10 @@ fn (p &Parser) is_addative() bool {
 // `pref.BuildMode.default_mode`
 fn (p mut Parser) enum_val() (ast.Expr,table.Type) {
 	p.check(.dot)
-	name := p.check_name()
+	val := p.check_name()
 	mut node := ast.Expr{}
 	node = ast.EnumVal{
-		name: name
+		val: val
 	}
 	return node,table.int_type
 }

vlib/v/table/atype_symbols.v

@@ -367,7 +367,7 @@ pub mut:
 
 pub struct Enum {
 pub mut:
-	vals []Field
+	vals []string
 }
 
 pub struct Alias {