143 lines
2.6 KiB
Go
143 lines
2.6 KiB
Go
package hcl
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/*
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#include <hcl.h>
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#include <hcl-utl.h>
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*/
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import "C"
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import (
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"fmt"
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"runtime"
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"unsafe"
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)
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type IOImpl interface {
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Open(g *HCL, name string, includer_name string) (int, error)
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Close(fd int)
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Read(fd int, buf []rune) (int, error)
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Write(data []rune) error
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WriteBytes(data []byte) error
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Flush() error
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}
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type HCL struct {
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c *C.hcl_t
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inst_no int
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io struct {
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r IOImpl
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s IOImpl
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p IOImpl
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}
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}
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type Ext struct {
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inst_no int
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}
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var inst_table InstanceTable
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func deregister_instance(g *HCL) {
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if g.inst_no >= 0 {
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inst_table.delete_instance(g.inst_no)
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g.inst_no = -1
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}
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}
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func New() (*HCL, error) {
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var c *C.hcl_t
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var g *HCL
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var ext *Ext
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var errnum C.hcl_errnum_t
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c = C.hcl_openstd(C.hcl_oow_t(unsafe.Sizeof(*ext)), &errnum)
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if c == nil {
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var buf [64]C.hcl_uch_t
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var ptr *C.hcl_uch_t
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var err error
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ptr = C.hcl_errnum_to_errucstr(errnum, &buf[0], C.hcl_oow_t(cap(buf)))
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err = fmt.Errorf("%s", string(ucstr_to_rune_slice(ptr)))
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return nil, err
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}
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ext = (*Ext)(unsafe.Pointer(C.hcl_getxtn(c)))
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g = &HCL{c: c, inst_no: -1}
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runtime.SetFinalizer(g, deregister_instance)
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g.inst_no = inst_table.add_instance(c, g)
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ext.inst_no = g.inst_no
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return g, nil
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}
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func (hcl *HCL) Close() {
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C.hcl_close(hcl.c)
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deregister_instance(hcl)
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}
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func (hcl *HCL) Ignite(memsize uintptr) error {
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if C.hcl_ignite(hcl.c, C.hcl_oow_t(memsize)) <= -1 {
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return fmt.Errorf("unable to ignite: %s", string(ucstr_to_rune_slice(C.hcl_geterrstr(hcl.c))))
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}
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return nil
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}
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func (hcl *HCL) AddBuiltinPrims() error {
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if C.hcl_addbuiltinprims(hcl.c) <= -1 {
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}
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return nil
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}
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func (hcl *HCL) AttachIO(r IOImpl, w IOImpl, p IOImpl) error {
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hcl.io.r = r
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hcl.io.s = s
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hcl.io.p = p
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if C.hcl_attachio(hcl.c, go_read_handler, go_scan_handler, go_print_handler) <= -1 {
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// TODO: restore to the old value..
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return fmt.Errorf("unable to attach I/O handlers: %s", string(ucstr_to_rune_slice(C.hcl_geterrstr(hcl.c))))
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}
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return nil
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}
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func (hcl *HCL) FeedString(str []rune) error {
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return nil
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}
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func (hcl *HCL) BeginFeed() {
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}
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func (hcl *HCL) EndFeed() {
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}
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func (hcl *HCL) Execute() {
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}
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func ucstr_to_rune_slice(str *C.hcl_uch_t) []rune {
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return uchars_to_rune_slice(str, uintptr(C.hcl_count_ucstr(str)))
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}
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func uchars_to_rune_slice(str *C.hcl_uch_t, len uintptr) []rune {
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var res []rune
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var i uintptr
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// TODO: proper encoding...
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res = make([]rune, len)
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for i = 0; i < len; i++ {
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res[i] = *(*rune)(unsafe.Pointer(uintptr(unsafe.Pointer(str)) + unsafe.Sizeof(*str)*i))
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}
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return res
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}
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func c_to_go(c *C.hcl_t) *HCL {
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var ext *Ext
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var inst Instance
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ext = (*Ext)(unsafe.Pointer(C.hcl_getxtn(c)))
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inst = inst_table.slot_to_instance(ext.inst_no)
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return inst.g
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}
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