go generics cannot parse

[medivh-jay]

Describe the bug
An error occurred while parsing a data structure that contains generics.

ParseComment error in file news.go :unknown field type &ast.IndexListExpr{X:(*ast.SelectorExpr)(0xc00047a750), Lbrack:267, Indices:[]ast.Expr{(*ast.StarExpr)(0xc00047a780), (*ast.SelectorExpr)(0xc00047a798)}, Rbrack:301}

This is my code:

type Filter interface {
	~func(selector *sql.Selector)
}

type query[T any, F Filter] interface {
	Where(ps ...F) T
}

type Pager[T query[T, F], F Filter] struct {
	Rows   uint8                `json:"rows" form:"rows"`
	Page   int                  `json:"page" form:"page"`
	NextID *valuer.StringValuer `json:"next_id" form:"next_id"`
	PrevID *valuer.StringValuer `json:"prev_id" form:"prev_id"`
	query  T
}

type NewsPager struct {
	request.Pager[*entity.NewsQuery, predicate.News]
	Search string `json:"search" form:"search"`
}

and this is my comment:

// @Summary xxx
// @Tags xxx
// @Description xxx
// @Param   data query  request.NewsPager true ""
// @Success 200 {object} response.Response{data=newsResponse} "ok"
// @Router  /api/v1/news [get]

Your swag version
e.g. 1.8.2

Your go version
1.18

Desktop (please complete the following information):

• OS: Windows 11

[medivh-jay]

create a project directly using the following code:

package main

type NewsSelector func(selector func())

type Filter interface {
	~func(selector func())
}

type query[T any, F Filter] interface {
	Where(ps ...F) T
}

type Pager[T query[T, F], F Filter] struct {
	Rows   uint8   `json:"rows" form:"rows"`
	Page   int     `json:"page" form:"page"`
	NextID *string `json:"next_id" form:"next_id"`
	PrevID *string `json:"prev_id" form:"prev_id"`
	query  T
}

type String string

func (String) Where(ps ...NewsSelector) String {
	return ""
}

type NewsPager struct {
	Pager[String, NewsSelector]
	Search string `json:"search" form:"search"`
}

// @Summary xxx
// @Tags xxx
// @Description xxx
// @Param   data query  NewsPager true "1"
// @Success 200 {object} string "ok"
// @Router  /api/v1/news [get]
func route() {

}

Then use swag init

[ubogdan]

Unfortunately, we don't have support for Generics now.

[medivh-jay]

when will generics be supported
Thank you very much for your reply

[ubogdan]

As you may know, swag is an Open Source project. Most of its code comes from community contributions. It's hard to say when I hope we will bring that functionality asap.

[dlaweb]

I also have Parsing issue on golang 1.18 based on the dep "golang.org/x/exp/constraints" yet I don't use generics in my project.

ParseFile error:vendor/golang.org/x/exp/constraints/constraints.go:13:2: illegal character U+007E '~' (and 10 more errors)

This appends on a command: swag init --parseInternal --parseVendor I will remove the vendor parsing to see if its working.