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gjq.go
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gjq.go
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package gjq
/*
#cgo LDFLAGS: -ljq
#cgo linux LDFLAGS: -lm
#include <stdlib.h>
#include <jq.h>
#include <jv.h>
typedef struct {
jv msg;
} gjq_error_data;
static void gjq_error_cb(void *data, jv msg) {
((gjq_error_data *)data)->msg = jq_format_error(msg);
}
static void gjq_set_error_cb(jq_state *jq, void *data) {
jq_set_error_cb(jq, gjq_error_cb, data);
}
*/
import "C"
import (
"fmt"
"unsafe"
"io"
"bytes"
)
// GJQ .
type GJQ struct {
jqState *C.jq_state
script string
errorData C.gjq_error_data
defferFuncs []func(g *GJQ) error
}
// NewGJQ .
func NewGJQ(script string) (*GJQ, error) {
ret := &GJQ{
jqState: C.jq_init(),
defferFuncs: []func(g *GJQ) error{
freeErrorData,
treadown,
},
}
C.gjq_set_error_cb(ret.jqState, unsafe.Pointer(&ret.errorData))
err := ret.compile(script)
if err != nil {
ret.Close()
return nil, err
}
return ret, nil
}
func (g *GJQ) Error() error {
return fmt.Errorf("in jq error: %v", C.GoString(C.jv_string_value(g.errorData.msg)))
}
func (g *GJQ) cString(str string) *C.char {
ret := C.CString(str)
g.defferFuncs = append(g.defferFuncs, func(*GJQ) error {
C.free(unsafe.Pointer(ret))
return nil
})
return ret
}
func (g *GJQ) compile(script string) error {
if result := C.jq_compile(g.jqState, g.cString(script)); result == 0 {
return g.Error()
}
return nil
}
func freeErrorData(g *GJQ) error {
C.jv_free(g.errorData.msg)
return nil
}
func treadown(g *GJQ) error {
C.jq_teardown(&g.jqState)
return nil
}
// Close with free
func (g *GJQ) Close() {
for _, f := range g.defferFuncs {
f(g)
}
}
// Run .
// TODO: input to any and use buffer
func (g *GJQ) Run(json string) (io.Reader, error) {
inputJv := C.jv_parse(g.cString(json))
if C.jv_is_valid(inputJv) == 0 {
// TODO:
return nil, fmt.Errorf("can'input: parse error")
}
C.jq_start(g.jqState, inputJv, C.int(0))
ret := bytes.NewBuffer(nil)
for tmp, first := C.jq_next(g.jqState), true; C.jv_is_valid(tmp) == 1; tmp = C.jq_next(g.jqState) {
if !first {
ret.Write([]byte{'\n'})
}
ret.WriteString(jvDumpString(tmp))
first = false
}
C.jq_start(g.jqState, C.jv_null(), C.int(0))
return ret, nil
}
func jvDumpString(str C.jv) string {
// When jv_dump_string is executed, jv_free is executed for the argument jv.
// > https://github.com/stedolan/jq/blob/80052e5275ae8c45b20411eecdd49c945a64a412/src/jv_print.c#L368
dumpedjv := C.jv_dump_string(str, C.int(0))
defer C.jv_free(dumpedjv)
return C.GoString(C.jv_string_value(dumpedjv))
}