checker: refactoring util fn inside utils utils.v file

Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>

vlib/v/checker/check_types.v

@@ -687,3 +687,33 @@ pub fn (mut c Checker) infer_fn_generic_types(func ast.Fn, mut node ast.CallExpr
 		c.need_recheck_generic_fns = true
 	}
 }
+
+// generic_type_has_concrete_type make sure that the generics is declared with a type
+// `Type<int>` and not `Type<T>`.
+fn (mut c Checker) generic_type_has_declared_with_concrete_type(typ ast.Type) bool {
+	return c.concrete_type_in_generic_type(typ).len > 0
+}
+
+fn (mut c Checker) concrete_type_in_generic_type(typ ast.Type) []ast.Type {
+	if typ.has_flag(.generic) /*true*/ {
+		//println('Chekcing generics ${c.table.type_to_str(typ)}')
+		unwrap_typ := c.unwrap_generic(typ)
+		//println('---> Generic inside ${c.table.type_to_str(unwrap_typ)}')
+		unwrap_sym := c.table.sym(unwrap_typ)
+		match unwrap_sym.info {
+			ast.Struct, ast.SumType, ast.Interface {
+				//println('Concrete types ${unwrap_sym.info.concrete_types}')
+				return unwrap_sym.info.concrete_types
+			}
+			ast.Alias {
+				return c.concrete_type_in_generic_type(unwrap_sym.info.parent_type)
+			}
+			else {
+				//println(unwrap_sym.info)
+				//println('****** no match found')
+			}
+		}
+	}
+	return []ast.Type{}
+}
+

vlib/v/checker/checker.v

@@ -2464,17 +2464,6 @@ fn (mut c Checker) stmts_ending_with_expression(stmts []ast.Stmt) {
 	c.scope_returns = false
 }
 
-pub fn (mut c Checker) unwrap_generic(typ ast.Type) ast.Type {
-	if typ.has_flag(.generic) {
-		if t_typ := c.table.resolve_generic_to_concrete(typ, c.table.cur_fn.generic_names,
-			c.table.cur_concrete_types)
-		{
-			return t_typ
-		}
-	}
-	return typ
-}
-
 // TODO node must be mut
 pub fn (mut c Checker) expr(node_ ast.Expr) ast.Type {
 	c.expr_level++
@@ -4159,48 +4148,6 @@ fn (mut c Checker) trace(fbase string, message string) {
 	}
 }
 
-fn (mut c Checker) ensure_type_exists(typ ast.Type, pos token.Pos) ? {
-	if typ == 0 {
-		c.error('unknown type', pos)
-		return
-	}
-	sym := c.table.sym(typ)
-	match sym.kind {
-		.placeholder {
-			if sym.language == .v && !sym.name.starts_with('C.') {
-				c.error(util.new_suggestion(sym.name, c.table.known_type_names()).say('unknown type `$sym.name`'),
-					pos)
-				return
-			}
-		}
-		.int_literal, .float_literal {
-			// Separate error condition for `int_literal` and `float_literal` because `util.suggestion` may give different
-			// suggestions due to f32 comparision issue.
-			if !c.is_builtin_mod {
-				msg := if sym.kind == .int_literal {
-					'unknown type `$sym.name`.\nDid you mean `int`?'
-				} else {
-					'unknown type `$sym.name`.\nDid you mean `f64`?'
-				}
-				c.error(msg, pos)
-				return
-			}
-		}
-		.array {
-			c.ensure_type_exists((sym.info as ast.Array).elem_type, pos) ?
-		}
-		.array_fixed {
-			c.ensure_type_exists((sym.info as ast.ArrayFixed).elem_type, pos) ?
-		}
-		.map {
-			info := sym.info as ast.Map
-			c.ensure_type_exists(info.key_type, pos) ?
-			c.ensure_type_exists(info.value_type, pos) ?
-		}
-		else {}
-	}
-}
-
 pub fn (mut c Checker) fail_if_unreadable(expr ast.Expr, typ ast.Type, what string) {
 	mut pos := token.Pos{}
 	match expr {

vlib/v/checker/utils.v

@@ -0,0 +1,83 @@
+module checker
+
+import v.ast
+import v.token
+import v.util
+
+// unwrap_generic unwrap the concrete type.
+fn (mut c Checker) unwrap_generic(typ ast.Type) ast.Type {
+	if typ.has_flag(.generic) {
+		if t_typ := c.table.resolve_generic_to_concrete(typ, c.table.cur_fn.generic_names,
+			c.table.cur_concrete_types)
+		{
+			return t_typ
+		}
+	}
+	return typ
+}
+
+// ensure_type_exists check if the type was found somewhere before.
+fn (mut c Checker) ensure_type_exists(typ ast.Type, pos token.Pos) ? {
+	if typ == 0 {
+		c.error('unknown type', pos)
+		return
+	}
+	sym := c.table.sym(typ)
+	match sym.kind {
+		.placeholder {
+			if sym.language == .v && !sym.name.starts_with('C.') {
+				c.error(util.new_suggestion(sym.name, c.table.known_type_names()).say('unknown type `$sym.name`'),
+					pos)
+				return
+			}
+		}
+		.int_literal, .float_literal {
+			// Separate error condition for `int_literal` and `float_literal` because `util.suggestion` may give different
+			// suggestions due to f32 comparision issue.
+			if !c.is_builtin_mod {
+				msg := if sym.kind == .int_literal {
+					'unknown type `$sym.name`.\nDid you mean `int`?'
+				} else {
+					'unknown type `$sym.name`.\nDid you mean `f64`?'
+				}
+				c.error(msg, pos)
+				return
+			}
+		}
+		.array {
+			c.ensure_type_exists((sym.info as ast.Array).elem_type, pos) ?
+		}
+		.array_fixed {
+			c.ensure_type_exists((sym.info as ast.ArrayFixed).elem_type, pos) ?
+		}
+		.map {
+			info := sym.info as ast.Map
+			c.ensure_type_exists(info.key_type, pos) ?
+			c.ensure_type_exists(info.value_type, pos) ?
+		}
+		.struct_ {
+			concrete_typs := c.concrete_type_in_generic_type(typ)
+			if concrete_typs.len > 0 {
+				for concrete_typ in concrete_typs {
+					//println('From Generics type ${c.table.type_to_str(concrete_typ)}')
+					c.ensure_type_exists(concrete_typ, pos) ?
+				}
+			}
+		}
+		.alias {
+			info := sym.info as ast.Alias
+			//println('Base type ${c.table.type_to_str(typ)}')
+			//println('Parent type ${c.table.type_to_str(info.parent_type)}')
+			c.ensure_type_exists(info.parent_type, pos) ?
+		}
+		.sum_type {
+			info := sym.info as ast.SumType
+			//println('Sum type ${c.table.type_to_str(typ)}')
+			for variant_typ in info.variants {
+				//println('Variant type -> ${c.table.type_to_str(variant_typ)}')
+				c.ensure_type_exists(variant_typ, pos) ?
+			}
+		}
+		else {}
+	}
+}