func (w *Writer) genTypeDef(d *cc.Decl) {
w.writeDocString(d.Name, "")
goName := cNameToGoUpper(d.Name)
switch d.Type.Kind {
case cc.Struct:
if d.Type.Decls == nil || goName == "Path" {
// Opaque typedef.
w.Print(`type %s struct {
Ptr *C.%s
}`, goName, d.Name)
cFinalizer := d.Name
if strings.HasSuffix(cFinalizer, "_t") {
cFinalizer = cFinalizer[:len(cFinalizer)-2]
}
cFinalizer += "_destroy"
w.Print("func free%s(obj *%s) {", goName, goName)
w.Print("C.%s(obj.Ptr)", cFinalizer)
w.Print("}")
w.Print("func wrap%s(p *C.%s) *%s {", goName, d.Name, goName)
w.Print("ret := &%s{p}", goName)
w.Print("runtime.SetFinalizer(ret, free%s)", goName)
w.Print("return ret")
w.Print("}")
} else {
sharedTypes[d.Name] = goName
w.Print("type %s struct {", goName)
for _, d := range d.Type.Decls {
typ := cTypeToMap(d.Type)
w.Print("%s %s", cNameToGoUpper(d.Name), typ.goType)
}
w.Print("}")
}
case cc.Enum:
type constEntry struct {
goName, cName string
}
consts := make([]constEntry, 0, len(d.Type.Decls))
for _, d := range d.Type.Decls {
constName := d.Name
if strings.HasPrefix(constName, "CAIRO_") {
constName = constName[len("CAIRO_"):]
}
constName = cNameToGoUpper(strings.ToLower(d.Name))
consts = append(consts, constEntry{constName, d.Name})
}
w.Print("type %s int", goName)
w.Print("const (")
for _, c := range consts {
w.Print("%s %s = C.%s", c.goName, goName, c.cName)
}
w.Print(")")
if goName != "Status" {
w.Print("func (i %s) String() string {", goName)
w.Print("switch i {")
for _, c := range consts {
w.Print("case %s: return \"%s\"", c.goName, c.goName)
}
w.Print("default: return fmt.Sprintf(\"%s(%%d)\", i)", goName)
w.Print("}")
w.Print("}")
}
default:
panic("unhandled decl " + d.String())
}
}
func (w *Writer) genTypeDef(d *cc.Decl) {
w.writeDocString(d.Name, "")
goName := cNameToGoUpper(d.Name)
switch d.Type.Kind {
case cc.Struct:
if d.Type.Decls == nil || goName == "Path" {
// Opaque typedef.
w.Print(`type %s struct {
Ptr *C.%s
}`, goName, d.Name)
cFinalizer := d.Name
if strings.HasSuffix(cFinalizer, "_t") {
cFinalizer = cFinalizer[:len(cFinalizer)-2]
}
cFinalizer += "_destroy"
w.Print("func free%s(obj *%s) {", goName, goName)
w.Print("C.%s(obj.Ptr)", cFinalizer)
w.Print("}")
w.Print("func wrap%s(p *C.%s) *%s {", goName, d.Name, goName)
w.Print("ret := &%s{p}", goName)
w.Print("runtime.SetFinalizer(ret, free%s)", goName)
w.Print("return ret")
w.Print("}")
w.Print("// Wrap a C %s* found from some external source as a *%s. The Go side will destroy the reference when it's no longer used.", d.Name, goName)
w.Print("func Wrap%s(p unsafe.Pointer) *%s {", goName, goName)
w.Print("return wrap%s((*C.%s)(p))", goName, d.Name)
w.Print("}")
w.Print("// Construct a %s from a C %s* found from some exernal source. It is the caller's responsibility to ensure the pointer lives.", goName, d.Name)
w.Print("func Borrow%s(p unsafe.Pointer) *%s {", goName, goName)
w.Print("return &%s{(*C.%s)(p)}", goName, d.Name)
w.Print("}")
} else {
sharedTypes[d.Name] = goName
w.Print("type %s struct {", goName)
for _, d := range d.Type.Decls {
typ := cTypeToMap(d.Type)
w.Print("%s %s", cNameToGoUpper(d.Name), typ.goType)
}
w.Print("}")
}
case cc.Enum:
type constEntry struct {
goName, cName string
}
consts := make([]constEntry, 0, len(d.Type.Decls))
for _, d := range d.Type.Decls {
constName := d.Name
if strings.HasPrefix(constName, "CAIRO_") {
constName = constName[len("CAIRO_"):]
}
constName = cNameToGoUpper(strings.ToLower(d.Name))
consts = append(consts, constEntry{constName, d.Name})
}
w.Print("type %s int", goName)
w.Print("const (")
for _, c := range consts {
w.Print("%s %s = C.%s", c.goName, goName, c.cName)
}
w.Print(")")
if goName != "Status" {
w.Print("// String implements the Stringer interface, which is used in places like fmt's %%q. For all enums like this it returns the Go name of the constant.")
w.Print("func (i %s) String() string {", goName)
w.Print("switch i {")
for _, c := range consts {
w.Print("case %s: return \"%s\"", c.goName, c.goName)
}
w.Print("default: return fmt.Sprintf(\"%s(%%d)\", i)", goName)
w.Print("}")
w.Print("}")
}
default:
panic("unhandled decl " + d.String())
}
}