// SassMakeImport attaches a Go pointer to a Sass function. Go will
// eventually kill this behavior and we should find a new way to do this.
func SassMakeImporter(fn SassImporterFN, priority int, v interface{}) (SassImporter, error) {
vv := reflect.ValueOf(v).Elem()
if !vv.CanAddr() {
return nil, errors.New("can not take address of")
}
// TODO: this will leak memory, the interface must be freed manually
lst := C.sass_make_importer(fn, C.double(priority), unsafe.Pointer(vv.Addr().Pointer()))
return (SassImporter)(lst), nil
}
// SetImporter enables custom importer in libsass
func (ctx *Context) SetImporter(opts *C.struct_Sass_Options) {
imps := C.sass_make_importer_list(1)
hdr := reflect.SliceHeader{
Data: uintptr(unsafe.Pointer(imps)),
Len: 1, Cap: 1,
}
goimps := *(*[]C.Sass_Importer_Entry)(unsafe.Pointer(&hdr))
p := C.SassImporter
imp := C.sass_make_importer(
C.Sass_Importer_Fn(p),
C.double(0),
unsafe.Pointer(ctx))
goimps[0] = imp
C.sass_option_set_c_importers(opts, imps)
}
// BindHeader attaches the header to a libsass context ensuring
// gc does not delete the pointers necessary to make this happen.
func BindHeader(opts SassOptions, entries []ImportEntry) *string {
idx := globalHeaders.set(entries)
ptr := unsafe.Pointer(idx)
imper := C.sass_make_importer(
C.Sass_Importer_Fn(C.SassHeaders),
C.double(0),
ptr,
)
impers := C.sass_make_importer_list(1)
C.sass_importer_set_list_entry(impers, 0, imper)
C.sass_option_set_c_headers(
(*C.struct_Sass_Options)(unsafe.Pointer(opts)),
impers)
return idx
}
// BindImporter attaches a custom importer Go function to an import in Sass
func BindImporter(opts SassOptions, entries []ImportEntry) int {
idx := globalImports.Set(entries)
ptr := unsafe.Pointer(idx)
imper := C.sass_make_importer(
C.Sass_Importer_Fn(C.SassImporterHandler),
C.double(0),
ptr,
)
impers := C.sass_make_importer_list(1)
C.sass_importer_set_list_entry(impers, 0, imper)
C.sass_option_set_c_importers(
(*C.struct_Sass_Options)(unsafe.Pointer(opts)),
impers,
)
return *idx
}
func (ctx *Context) SetHeaders(opts *C.struct_Sass_Options) {
// Push the headers into the local array
for _, gh := range globalHeaders {
ctx.Headers.Add(gh)
}
cheads := C.sass_make_importer_list(1)
hdr := reflect.SliceHeader{
Data: uintptr(unsafe.Pointer(cheads)),
Len: 1, Cap: 1,
}
goheads := *(*[]C.Sass_Importer_Entry)(unsafe.Pointer(&hdr))
imper := C.sass_make_importer(
C.Sass_Importer_Fn(C.SassHeaders),
C.double(0),
unsafe.Pointer(ctx))
goheads[0] = imper
C.sass_option_set_c_headers(opts, cheads)
}