328 lines
6.7 KiB
Go
328 lines
6.7 KiB
Go
package types
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import (
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"fmt"
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"strings"
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)
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//super is a map recording which class is the parent of each other class
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var super map[string]string
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//wrapped is a map recording whether a given GoType is to be "wrapped" in a
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//go struct.
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var wrapped map[string]bool
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func shouldWrap(gt string) bool {
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return gt != "" && gt[0] == '*' && wrapped[gt[1:]]
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}
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//goInterfaces records the names of top level Go interfaces. Pointers to these
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//are dereferenced to bare interface names.
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var goInterfaces map[string]bool
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func isGoInterface(gt string) bool {
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return goInterfaces[gt]
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}
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//TypeParameters maps, for each class, a TypedefName to a type, representing
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//the Objective-C type parameters for that class
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var TypeParameters map[string]map[string]string
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//Typedefs maps from C types to the Type of a typedef with that name.
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var typedefs map[string]*Type
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func (t *Type) Typedef() *Type {
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return typedefs[t.BaseType().CType()]
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}
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func init() {
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super = make(map[string]string)
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wrapped = make(map[string]bool)
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goInterfaces = make(map[string]bool)
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TypeParameters = make(map[string]map[string]string)
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typedefs = make(map[string]*Type)
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}
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func Super(c string) string {
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return super[c]
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}
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func SetSuper(c, p string) {
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super[c] = p
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}
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func SetTypeParam(c, n, t string) {
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if TypeParameters[c] == nil {
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TypeParameters[c] = make(map[string]string)
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}
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TypeParameters[c][n] = t
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}
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func AddTypedef(n,t string) {
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typedefs[n] = NewTypeFromString(t,"")
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}
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type Type struct {
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Node *Node
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Class string
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ctype string
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Variadic bool
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}
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func NewType(n *Node, c string) *Type {
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return &Type{
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Node: n,
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Class: c,
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ctype: "",
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}
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}
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func NewTypeFromString(t,c string) *Type {
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n,err := Parse(t)
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if n.IsId() {
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//if n.CtypeSimplified() == "id" {
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n,err = Parse("NSObject*")
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}
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if err != nil {
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return &Type{}
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}
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if TypeParameters[c] != nil {
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recur := false
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for k,v := range TypeParameters[c] {
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recur = n.renameTypedefs(k,v)
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}
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if recur {
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return NewTypeFromString(n.Ctype(),c)
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}
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}
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return &Type{
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Node: n,
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Class: c,
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ctype: "",
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}
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}
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func (t *Type) String() string {
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return t.Node.String()
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}
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func (t *Type) PointsTo() *Type {
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return NewType(t.Node.PointsTo(), t.Class)
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}
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func Wrap(s string) {
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// it is the pointers to this type that get wrapped
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wrapped[s] = true
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}
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func (t *Type) BaseType() *Type {
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ret := NewType(
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t.Node.BaseType(),
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t.Class,
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)
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return ret
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}
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func swapstars(s string) string {
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for i := len(s) - 1; i > 0 && s[i] == '*'; {
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s = "*" + s[:i]
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}
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return strings.TrimSpace(s)
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}
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func (t *Type) CGoType() string {
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ct := swapstars("C." + t.CType())
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ct = strings.ReplaceAll(ct,"unsigned ","u")
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ct = strings.ReplaceAll(ct,"signed ","u")
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ct = strings.ReplaceAll(ct,"long ","long")
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ct = strings.ReplaceAll(ct,"complex ","complex")
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ct = strings.ReplaceAll(ct," ","_")
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return ct
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}
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func (t *Type) GoType() string {
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return _goType(t.CType())
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}
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func _goType(ct string) string {
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ct = swapstars(ct)
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ct = strings.Title(ct)
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ct = strings.ReplaceAll(ct," ","")
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ct = strings.ReplaceAll(ct,"Struct","")
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if len(ct) > 0 && ct[0] == '*' && isGoInterface(ct[1:]) {
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return ct[1:]
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}
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return ct
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}
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func (t *Type) CType() string {
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return t._CType(false)
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}
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func (t *Type) CTypeAttrib() string {
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return t._CType(true)
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}
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func (t *Type) _CType(attrib bool) string {
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//if !attrib && c.ctype != "" ... FIXME?
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if t.ctype != "" { // cache
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return t.ctype
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}
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var ct string
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if attrib {
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ignore := map[string]bool { "GenericList": true }
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ct = t.Node._Ctype(ignore)
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} else {
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ct = t.Node.CtypeSimplified()
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}
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ct = strings.ReplaceAll(ct,"instancename",t.Class)
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ct = strings.ReplaceAll(ct,"instancetype",t.Class + " *")
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if len(ct) > 1 && ct[:2] == "id" {
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ct = "NSObject*" + ct[2:]
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}
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if len(ct) > 11 {
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if ct[:12] == "instancename" { ct = t.Class + ct[12:] }
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if ct[:12] == "instancetype" { ct = t.Class + ct[12:] + " *" }
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}
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if attrib {
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t._CType(false)
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} else {
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t.ctype = ct
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}
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return ct
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}
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func (t *Type) GoTypeDecl() string {
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if wrapped[t.GoType()] {
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return t.GoInterfaceDecl()
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}
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tp := t.BaseType()
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if tp.Node.IsId() {
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return ""
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}
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gt := tp.GoType()
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switch gt {
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case "", "Void":
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return ""
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default:
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extra := t.Node.CtypeSimplified()
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var cgt string
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if td := tp.Typedef(); td != nil {
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cgt = td.CGoType()
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extra = "typedef " + td.Node.Ctype()
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} else {
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cgt = tp.CGoType()
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}
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return fmt.Sprintf(`
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//%s (%s)
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type %s %s
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`,t.Node.Ctype(),extra,gt,cgt)
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}
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}
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func (t *Type) GoInterfaceDecl() string {
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gt := t.GoType()
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if gt[0] == '*' {
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gt = gt[1:] // dereference wrapped types
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}
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super := Super(gt)
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if super == "" {
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goInterfaces[gt] = true
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return fmt.Sprintf(`
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//%s (%s)
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type %s interface {
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Ptr() unsafe.Pointer
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}
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`,t.Node.Ctype(),t.BaseType().GoType(),gt)
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}
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if isGoInterface(super) {
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super = "Id"
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}
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return fmt.Sprintf(`
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//%s (%s)
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type %s struct { %s }
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func (o *%s) Ptr() unsafe.Pointer { return o.ptr }
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`,t.Node.Ctype(),t.BaseType().GoType(),gt,super,gt)
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}
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func (t *Type) IsFunction() bool {
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if td := t.Typedef(); td != nil {
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return td.IsFunction()
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}
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return t.Node.IsFunction()
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}
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func (t *Type) IsPointer() bool {
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if td := t.Typedef(); td != nil {
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return td.IsPointer()
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}
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return t.Node.IsPointer()
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}
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func (t *Type) CToGo(cval string) string { // cast C value to CGo
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if t.IsPointer() {
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cval = "unsafe.Pointer(" + cval + ")"
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}
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return fmt.Sprintf("(%s)(%s)",t.GoType(),cval)
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}
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// Call a C function from Go with a given return type and parameter types
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func GoToC(name string, pnames []string, rtype *Type, ptypes []*Type) string {
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var ret strings.Builder
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rt := rtype.CType()
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if rt != "void" {
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rtgt := rtype.GoType()
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if shouldWrap(rtgt) || isGoInterface(rtgt) {
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if isGoInterface(rtgt) {
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rtgt = "Id"
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} else {
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rtgt = rtgt[1:]
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}
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ret.WriteString(" ret := &" + rtgt + "{}\n")
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ret.WriteString(" ret.ptr = unsafe.Pointer(")
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} else {
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ret.WriteString(" return (" + rtype.GoType() + ")(")
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if rtype.Node.IsPointer() {
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ret.WriteString("unsafe.Pointer(")
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}
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}
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}
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ret.WriteString("C." + name + "(")
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parms := []string{}
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for i := 0; i < len(pnames); i++ {
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pn,pt := pnames[i],ptypes[i]
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p := pn
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if (shouldWrap(pt.GoType()) || isGoInterface(pt.GoType())) && !pt.Variadic {
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p = pn + ".Ptr()"
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} else {
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switch {
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case pt.Variadic:
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p = "unsafe.Pointer(&" + p + ")"
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case pt.Node.IsPointer():
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p = "unsafe.Pointer(" + pn + ")"
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default:
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p = "(" + pt.CGoType() + ")(" + pn + ")"
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}
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}
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parms = append(parms,p)
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}
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ret.WriteString(strings.Join(parms,", "))
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ret.WriteString(")")
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if rt != "void" {
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if shouldWrap(rtype.GoType()) || isGoInterface(rtype.GoType()) {
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ret.WriteString(`)
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return ret
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`)
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} else {
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ret.WriteString(")")
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if rtype.Node.IsPointer() {
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ret.WriteString(")")
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}
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ret.WriteString("\n")
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}
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}
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return ret.String()
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}
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