v3: panic (invalid memory address or nil pointer dereference)

[leonklingele]

Describe the bug

I'm getting a panic on the latest v3 commit due o definition.Spec being nil here:

swag/parserv3.go

Line 666 in c7b796d

if definition.Spec.Description == "" {

To Reproduce

go install github.com/swaggo/swag/v2/cmd/swag@c7b796dcb851ffca7e16b18bc91aa3696f6dadf5

swag init --output spec --outputTypes go,yaml --parseDependency --parseDepth 1 --v3.1

Your swag version

c7b796d

Your go version

1.19.9

Desktop (please complete the following information):

NixOS 22.11

Additional context

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x230 pc=0x8d4755]

goroutine 1 [running]:
github.com/swaggo/swag/v2.(*Parser).ParseDefinitionV3(0xc000230000, 0xc001c6cf50)
/path/to/project/.gopath/pkg/mod/github.com/swaggo/swag/[email protected]/parserv3.go:666 +0x475
github.com/swaggo/swag/v2.(*Parser).getTypeSchemaV3(0xc000230000, {0xc000035d76, 0x19}, 0x0?, 0x0)
/path/to/project/.gopath/pkg/mod/github.com/swaggo/swag/[email protected]/parserv3.go:611 +0xaf9
github.com/swaggo/swag/v2.(*OperationV3).ParseParamComment(0xc00852a200, {0xc000035d6b, 0x38}, 0x2?)
/path/to/project/.gopath/pkg/mod/github.com/swaggo/swag/[email protected]/operationv3.go:338 +0xcc7
github.com/swaggo/swag/v2.(*OperationV3).ParseComment(0xc00852a200, {0xc000035d60?, 0x1?}, 0x9c2060?)
/path/to/project/.gopath/pkg/mod/github.com/swaggo/swag/[email protected]/operationv3.go:86 +0x1b1
github.com/swaggo/swag/v2.(*Parser).ParseRouterAPIInfoV3(0xc000230000, 0xc0002b4680)
/path/to/project/.gopath/pkg/mod/github.com/swaggo/swag/[email protected]/parserv3.go:456 +0x213
github.com/swaggo/swag/v2.(*PackagesDefinitions).RangeFiles(0xc0001c88d0, 0xc008fbf568)
/path/to/project/.gopath/pkg/mod/github.com/swaggo/swag/[email protected]/packages.go:107 +0x2ac
github.com/swaggo/swag/v2.(*Parser).ParseAPIMultiSearchDir(0xc000230000, {0xc0002288e0?, 0x1?, 0x0?}, {0xa9b050?, 0x7?}, 0xc00022c700?)
/path/to/project/.gopath/pkg/mod/github.com/swaggo/swag/[email protected]/parser.go:422 +0x1ae
github.com/swaggo/swag/v2/gen.(*Gen).Build(0xc0001c8600, 0xc0001c0c80)
/path/to/project/.gopath/pkg/mod/github.com/swaggo/swag/[email protected]/gen/gen.go:219 +0x7bd
main.initAction(0xc00017cb00?)
/path/to/project/.gopath/pkg/mod/github.com/swaggo/swag/[email protected]/cmd/swag/main.go:207 +0xb25
github.com/urfave/cli/v2.(*Command).Run(0xc00017cb00, 0xc0001c4700, {0xc00015c2d0, 0x9, 0x9})
/path/to/project/.gopath/pkg/mod/github.com/urfave/cli/[email protected]/command.go:274 +0xa42
github.com/urfave/cli/v2.(*Command).Run(0xc00017cf20, 0xc0001c45c0, {0xc000130000, 0xa, 0xa})
/path/to/project/.gopath/pkg/mod/github.com/urfave/cli/[email protected]/command.go:267 +0xc97
github.com/urfave/cli/v2.(*App).RunContext(0xc0001aa1e0, {0xb867f0?, 0xc00012a030}, {0xc000130000, 0xa, 0xa})
/path/to/project/.gopath/pkg/mod/github.com/urfave/cli/[email protected]/app.go:332 +0x616
github.com/urfave/cli/v2.(*App).Run(...)
/path/to/project/.gopath/pkg/mod/github.com/urfave/cli/[email protected]/app.go:309
main.main()
/path/to/project/.gopath/pkg/mod/github.com/swaggo/swag/[email protected]/cmd/swag/main.go:285 +0x636
make: *** [Makefile:61: autogen] Error 2

[leonklingele]

Tracked this down to being an issue with referencing objects as type-aliases in the Success or Param directive:

// @Param data body io.UserUpdateRequest true "The updated user model"

This throws the panic:

type UserUpdateRequest = UserCreateRequest

while this doesn't:

type UserUpdateRequest UserCreateRequest

[artem328]

Hi there, I have created a pull request with the fix