checker: AsCast, CharLiteral, fix integer index check

README.md

@@ -38,7 +38,7 @@ Installing V: [github.com/vlang/v#installing-v-from-source](https://github.com/v
 - Built-in ORM
 - C and JavaScript backends
 
-A stable 0.2 release is planned for February 2020. Right now V is in an alpha stage.
+A stable 0.2 release is planned for March 2020. Right now V is in an alpha stage.
 
 ## Installing V from source
 

vlib/v/ast/ast.v

@@ -12,7 +12,7 @@ pub type Expr = InfixExpr | IfExpr | StringLiteral | IntegerLiteral | CharLitera
 FloatLiteral | Ident | CallExpr | BoolLiteral | StructInit | ArrayInit | SelectorExpr | PostfixExpr | 	
 AssignExpr | PrefixExpr | MethodCallExpr | IndexExpr | RangeExpr | MatchExpr | 	
 CastExpr | EnumVal | Assoc | SizeOf | None | MapInit | IfGuardExpr | ParExpr | OrExpr | 	
-ConcatExpr | TypeName
+ConcatExpr | TypeName | AsCast
 
 pub type Stmt = VarDecl | GlobalDecl | FnDecl | Return | Module | Import | ExprStmt | 	
 ForStmt | StructDecl | ForCStmt | ForInStmt | CompIf | ConstDecl | Attr | BranchStmt | 	
@@ -408,6 +408,11 @@ pub:
 	pos   token.Position
 }
 
+pub struct AsCast {
+pub:
+	typ table.Type
+}
+
 // e.g. `[unsafe_fn]`
 pub struct Attr {
 pub:

vlib/v/checker/checker.v

@@ -480,6 +480,9 @@ pub fn (c mut Checker) expr(node ast.Expr) table.Type {
 		ast.ArrayInit {
 			return c.array_init(mut it)
 		}
+		ast.AsCast {
+			return it.typ
+		}
 		ast.AssignExpr {
 			c.check_assign_expr(it)
 		}
@@ -769,7 +772,7 @@ pub fn (c mut Checker) index_expr(node ast.IndexExpr) table.Type {
 		index_type_sym := c.table.get_type_symbol(index_type)
 		// println('index expr left=$typ_sym.name $node.pos.line_nr')
 		if typ_sym.kind == .array && (!(table.type_idx(index_type) in table.number_idxs) && index_type_sym.kind != .enum_) {
-			c.error('non-integer index (type `$typ_sym.name`)', node.pos)
+			c.error('non-integer index `$index_type_sym.name` (array type `$typ_sym.name`)', node.pos)
 		}
 		else if typ_sym.kind == .map && table.type_idx(index_type) != table.string_type_idx {
 			c.error('non-string map index (type `$typ_sym.name`)', node.pos)

vlib/v/gen/cgen.v

@@ -262,6 +262,9 @@ fn (g mut Gen) expr(node ast.Expr) {
 		ast.BoolLiteral {
 			g.write(it.val.str())
 		}
+		ast.CharLiteral {
+			g.write("'$it.val'")
+		}
 		ast.EnumVal {
 			g.write('${it.enum_name}_$it.val')
 		}
@@ -404,7 +407,7 @@ fn (g mut Gen) expr(node ast.Expr) {
 			}
 		}
 		else {
-			println(term.red('cgen.expr(): bad node'))
+			verror(term.red('cgen.expr(): bad node ' + typeof(node)))
 		}
 	}
 }

vlib/v/parser/parser.v

@@ -825,6 +825,9 @@ pub fn (p mut Parser) expr(precedence int) (ast.Expr,table.Type) {
 		else if p.tok.kind == .key_as {
 			p.next()
 			typ = p.parse_type()
+			node = ast.AsCast {
+				typ: typ
+			}
 		}
 		else if p.tok.kind.is_infix() {
 			node,typ = p.infix_expr(node)

vlib/v/table/types.v

@@ -118,9 +118,8 @@ pub fn new_type_ptr(idx int, nr_muls int) Type {
 }
 
 pub const (
-	number_idxs = [int_type_idx, byte_type_idx, u32_type_idx, u64_type_idx]
+	number_idxs = [int_type_idx, byte_type_idx, u16_type_idx, i16_type_idx, i64_type_idx, u32_type_idx, u64_type_idx]
 )
-
 /*
 pub fn is_number(typ Type) bool {
 	typ_sym := c.table.get_type_symbol(typ)