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// Copyright © 2020 Bjørn Erik Pedersen <bjorn.erik.pedersen@gmail.com>.
//
// Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.
package libsass
// #include <stdint.h>
// #include "sass/context.h"
//
// extern struct Sass_Import** BridgeImport(const char* currPath, const char* prevPath, int i);
//
// Sass_Import_List SassImport(const char* currPath, Sass_Importer_Entry imp, struct Sass_Compiler* comp)
// {
// void* c = sass_importer_get_cookie(imp);
// uintptr_t ci = (uintptr_t)c;
// struct Sass_Import* prevPath = sass_compiler_get_last_import(comp);
// const char* prev_path = sass_import_get_imp_path(prevPath);
// return BridgeImport(currPath, prev_path, ci);
// }
import "C"
import (
"sync"
"unsafe"
)
const uintptrOffset = 4096 // the smallest legal pointer
var importsStore = &idMap{
m: make(map[int]interface{}),
i: uintptrOffset,
}
// AddImportResolver adds a function to resolve imports in LibSASS.
// Make sure to run call DeleteImportResolver when done.
//
//go:nocheckptr
func AddImportResolver(opts SassOptions, resolver ImportResolver) int {
i := importsStore.Set(resolver)
// This looks unsafe, but LibSass is using void* to store an int.
// TODO(bep) this prevents us from "fail on go vet errors" in GitHub action.
id := unsafe.Pointer(uintptr(i))
importers := C.sass_make_importer_list(1)
C.sass_importer_set_list_entry(
importers,
0,
C.sass_make_importer(
C.Sass_Importer_Fn(C.SassImport),
C.double(0),
id,
),
)
C.sass_option_set_c_importers(
(*C.struct_Sass_Options)(unsafe.Pointer(opts)),
importers,
)
return i
}
func DeleteImportResolver(i int) error {
importsStore.Delete(i)
return nil
}
// ImportResolver can be used as a custom import resolver.
// Return an empty body to load the import body from the path.
// See AddImportResolver.
type ImportResolver func(currPath string, prevPath string) (newPath string, body string, resolved bool)
type idMap struct {
sync.RWMutex
m map[int]interface{}
i int
idStack []int
}
func (m *idMap) Delete(i int) {
m.Lock()
defer m.Unlock()
m.idStack = append(m.idStack, i)
delete(m.m, i)
}
func (m *idMap) Get(i int) interface{} {
m.RLock()
defer m.RUnlock()
return m.m[i]
}
func (m *idMap) nextID() (id int) {
if len(m.idStack) == 0 {
for i := 1; i <= 50; i++ {
m.idStack = append(m.idStack, m.i+i)
}
m.i += 50
}
id, m.idStack = m.idStack[len(m.idStack)-1], m.idStack[:len(m.idStack)-1]
return
}
func (m *idMap) Set(v interface{}) int {
m.Lock()
defer m.Unlock()
id := m.nextID()
m.m[id] = v
return id
}
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