cgen: fix auto_str for option values (#17910)

vlib/v/checker/tests/comptime_dump_fields_var_test.out

@@ -3,6 +3,6 @@
 [vlib/v/checker/tests/comptime_dump_fields_var_test.vv:13] val.$(field.name): 1
 [vlib/v/checker/tests/comptime_dump_fields_var_test.vv:13] val.$(field.name): Option(0)
 [vlib/v/checker/tests/comptime_dump_fields_var_test.vv:13] val.$(field.name): struct {
-    i: 100
+    i: Option(100)
 }
 ok

vlib/v/gen/c/auto_str_methods.v

@@ -192,13 +192,9 @@ fn (mut g Gen) gen_str_for_option(typ ast.Type, styp string, str_fn_name string)
 	} else {
 		g.auto_str_funcs.writeln('\t\tres = ${parent_str_fn_name}(*(${sym.cname}*)it.data);')
 	}
-	g.auto_str_funcs.writeln('\t} else {')
-
-	tmp_str := str_intp_sub('error: %%', 'IError_str(it.err)')
-	g.auto_str_funcs.writeln('\t\tres = ${tmp_str};')
+	g.auto_str_funcs.writeln('\t\treturn ${str_intp_sub('Option(%%)', 'res')};')
 	g.auto_str_funcs.writeln('\t}')
-
-	g.auto_str_funcs.writeln('\treturn ${str_intp_sub('Option(%%)', 'res')};')
+	g.auto_str_funcs.writeln('\treturn _SLIT("Option(none)");')
 	g.auto_str_funcs.writeln('}')
 }
 
@@ -231,7 +227,7 @@ fn (mut g Gen) gen_str_for_result(typ ast.Type, styp string, str_fn_name string)
 	g.auto_str_funcs.writeln('\t\tres = ${tmp_str};')
 	g.auto_str_funcs.writeln('\t}')
 
-	g.auto_str_funcs.writeln('\treturn ${str_intp_sub('result(%%)', 'res')};')
+	g.auto_str_funcs.writeln('\treturn ${str_intp_sub('Result(%%)', 'res')};')
 	g.auto_str_funcs.writeln('}')
 }
 
@@ -897,16 +893,19 @@ fn (mut g Gen) gen_str_for_struct(info ast.Struct, styp string, typ_str string,
 			''
 		}
 		base_fmt := g.type_to_fmt(g.unwrap_generic(field.typ))
+		is_opt_field := field.typ.has_flag(.option)
 
 		// manage prefix and quote symbol for the filed
 		mut quote_str := ''
 		mut prefix := ''
 		sym := g.table.sym(g.unwrap_generic(field.typ))
-		if sym.kind == .string {
-			quote_str = "'"
-		} else if field.typ in ast.charptr_types {
-			quote_str = '\\"'
-			prefix = 'C'
+		if !is_opt_field {
+			if sym.kind == .string {
+				quote_str = "'"
+			} else if field.typ in ast.charptr_types {
+				quote_str = '\\"'
+				prefix = 'C'
+			}
 		}
 
 		if is_first {
@@ -937,7 +936,9 @@ fn (mut g Gen) gen_str_for_struct(info ast.Struct, styp string, typ_str string,
 			g.get_str_fn(ftyp_noshared)
 		}
 		// with floats we use always the g representation:
-		if sym.kind !in [.f32, .f64] {
+		if is_opt_field {
+			fn_body.write_string('{_SLIT("${quote_str}"), ${c.si_s_code}, {.d_s=')
+		} else if sym.kind !in [.f32, .f64] {
 			fn_body.write_string('{_SLIT("${quote_str}"), ${int(base_fmt)}, {.${data_str(base_fmt)}=')
 		} else {
 			g_fmt := '0x' + (u32(base_fmt) | u32(0x7F) << 9).hex()
@@ -949,8 +950,11 @@ fn (mut g Gen) gen_str_for_struct(info ast.Struct, styp string, typ_str string,
 			field.name, sym_has_str_method, str_method_expects_ptr)
 		ftyp_nr_muls := field.typ.nr_muls()
 		if ftyp_nr_muls > 1 || field.typ in ast.cptr_types {
-			func = '(voidptr) it.${field.name}'
-			caller_should_free = false
+			if is_opt_field {
+			} else {
+				func = '(voidptr) it.${field.name}'
+				caller_should_free = false
+			}
 		} else if ftyp_noshared.is_ptr() {
 			// reference types can be "nil"
 			if ftyp_noshared.has_flag(.option) {
@@ -1004,7 +1008,7 @@ fn struct_auto_str_func(sym &ast.TypeSymbol, _field_type ast.Type, fn_name strin
 	deref, _ := deref_kind(expects_ptr, field_type.is_ptr(), field_type)
 	if sym.kind == .enum_ {
 		return '${fn_name}(${deref}(it.${c_name(field_name)}))', true
-	} else if should_use_indent_func(sym.kind) {
+	} else if _field_type.has_flag(.option) || should_use_indent_func(sym.kind) {
 		obj := '${deref}it.${c_name(field_name)}${sufix}'
 		if has_custom_str {
 			return '${fn_name}(${obj})', true

vlib/v/gen/c/testdata/comptime_option_call.out

@@ -1,10 +1,10 @@
 0
 0
-Option(error: none)
-Option(error: none)
-Option(error: none)
-Option(error: none)
+Option(none)
+Option(none)
+Option(none)
+Option(none)
 1
 1
 println(NIL)
-Option(error: none)
+Option(none)

vlib/v/slow_tests/inout/struct_dump_option_fields.out

@@ -0,0 +1,18 @@
+Test{
+    a: Option(none)
+    b: Option(none)
+    c: Option(none)
+    d: &Option(none)
+    e: Option(none)
+    f: Option(none)
+    g: Option(none)
+    h: &Option(none)
+    i: Option(none)
+    j: Option(none)
+    k: []
+    l: []
+    m: []
+    n: Option(Other{
+        a: Option(none)
+    })
+}

vlib/v/slow_tests/inout/struct_dump_option_fields.vv

@@ -0,0 +1,35 @@
+type Alias = int
+
+type SumType = int | string
+
+enum Abc {
+    a
+    b
+    c
+}
+
+struct Other {
+    a ?int
+}
+
+struct Test {
+    a ?int
+    b ?string
+    c ?[]int
+    d ?&int
+    e ?Alias
+    f ?SumType
+    g ?Other
+    h ?&&int
+    i ?Abc
+    j ?fn (int) 
+    k []?int
+    l []?string
+    m []?Other
+    n ?Other = Other{}
+}
+
+fn main() {
+    t := Test{}
+    println(t)
+}

vlib/v/slow_tests/inout/struct_field_option.out

@@ -16,11 +16,11 @@
 none
 3
 Foo{
-    bar: 3
-    baz: 0
+    bar: Option(3)
+    baz: Option(none)
 }
 [vlib/v/slow_tests/inout/struct_field_option.vv:61] f: Foo{
-    bar: 3
-    baz: 0
+    bar: Option(3)
+    baz: Option(none)
 }
-1
+1

vlib/v/tests/option_fixed_array_test.v

@@ -24,7 +24,7 @@ fn f_arr2(args ?[3]f64) ?[]f64 {
 
 fn test_simple() {
 	mut arr := ?[3]int(none)
-	println(arr) // Option(error: none)
+	println(arr) // Option(none)
 }
 
 fn test_simple_assign() {

vlib/v/tests/option_struct_init_test.v

@@ -15,6 +15,6 @@ fn test_main() {
 	}
 	assert a.str() == 'MyStruct2{
     valuea: 1
-    valueb: Option(error: none)
+    valueb: Option(none)
 }'
 }

vlib/v/tests/results_test.v

@@ -21,7 +21,7 @@ fn test_return_err_var() {
 }
 
 fn test_str() {
-	assert '${foo()}' == 'result(1)'
+	assert '${foo()}' == 'Result(1)'
 }
 
 fn result_void(err bool) ! {

vlib/v/tests/str_gen_test.v

@@ -328,12 +328,12 @@ fn test_multi_generic_struct() {
 	assert x.str() == 'MultiGenericStruct[TestStruct, TestStruct]{\n    t: TestStruct{\n        x: 0\n    }\n    x: TestStruct{\n        x: 0\n    }\n}'
 }
 
-fn create_option_err() ?string {
+fn create_option_err() !string {
 	return error('this is an error')
 }
 
-fn test_option_err() {
-	assert '${create_option_err()}' == 'Option(error: this is an error)'
+fn test_result_err() {
+	assert '${create_option_err()}' == 'Result(error: this is an error)'
 }
 
 fn create_option_none() ?string {
@@ -341,7 +341,7 @@ fn create_option_none() ?string {
 }
 
 fn test_option_none() {
-	assert '${create_option_none()}' == 'Option(error: none)'
+	assert '${create_option_none()}' == 'Option(none)'
 }
 
 fn create_option_string() ?string {

vlib/x/json2/encoder.v

@@ -155,7 +155,7 @@ fn (e &Encoder) encode_struct[U](val U, level int, mut wr io.Writer) ! {
 	mut i := 0
 	mut fields_len := 0
 	$for field in U.fields {
-		if val.$(field.name).str() != 'Option(error: none)' {
+		if val.$(field.name).str() != 'Option(none)' {
 			fields_len++
 		}
 	}
@@ -171,7 +171,7 @@ fn (e &Encoder) encode_struct[U](val U, level int, mut wr io.Writer) ! {
 		}
 
 		$if field.is_option {
-			is_none := value.str() == 'Option(error: none)'
+			is_none := value.str() == 'Option(none)'
 
 			if !is_none {
 				e.encode_newline(level, mut wr)!