package templates
import (
"fmt"
"go/types"
"strconv"
"github.com/99designs/gqlgen/internal/code"
)
type Import struct {
Name string
Path string
Alias string
}
type Imports struct {
imports []*Import
destDir string
}
func (i *Import) String() string {
if i.Alias == i.Name {
return strconv.Quote(i.Path)
}
return i.Alias + " " + strconv.Quote(i.Path)
}
func (s *Imports) String() string {
res := ""
for i, imp := range s.imports {
if i != 0 {
res += "\n"
}
res += imp.String()
}
return res
}
func (s *Imports) Reserve(path string, aliases ...string) (string, error) {
if path == "" {
panic("empty ambient import")
}
// if we are referencing our own package we dont need an import
if code.ImportPathForDir(s.destDir) == path {
return "", nil
}
name := code.NameForPackage(path)
var alias string
if len(aliases) != 1 {
alias = name
} else {
alias = aliases[0]
}
if existing := s.findByPath(path); existing != nil {
if existing.Alias == alias {
return "", nil
}
return "", fmt.Errorf("ambient import already exists")
}
if alias := s.findByAlias(alias); alias != nil {
return "", fmt.Errorf("ambient import collides on an alias")
}
s.imports = append(s.imports, &Import{
Name: name,
Path: path,
Alias: alias,
})
return "", nil
}
func (s *Imports) Lookup(path string) string {
if path == "" {
return ""
}
path = code.NormalizeVendor(path)
// if we are referencing our own package we dont need an import
if code.ImportPathForDir(s.destDir) == path {
return ""
}
if existing := s.findByPath(path); existing != nil {
return existing.Alias
}
imp := &Import{
Name: code.NameForPackage(path),
Path: path,
}
s.imports = append(s.imports, imp)
alias := imp.Name
i := 1
for s.findByAlias(alias) != nil {
alias = imp.Name + strconv.Itoa(i)
i++
if i > 10 {
panic(fmt.Errorf("too many collisions, last attempt was %s", alias))
}
}
imp.Alias = alias
return imp.Alias
}
func (s *Imports) LookupType(t types.Type) string {
return types.TypeString(t, func(i *types.Package) string {
return s.Lookup(i.Path())
})
}
func (s Imports) findByPath(importPath string) *Import {
for _, imp := range s.imports {
if imp.Path == importPath {
return imp
}
}
return nil
}
func (s Imports) findByAlias(alias string) *Import {
for _, imp := range s.imports {
if imp.Alias == alias {
return imp
}
}
return nil
}
