// compileJq compiles a program into the jq interpreter
func compileJq(jq *C.jq_state, src string) error {
var msg *C.char
C.set_err_cb(jq, &msg)
defer C.set_err_cb(jq, nil)
csrc := C.CString(src)
defer C.free(unsafe.Pointer(csrc))
// TODO: use a SyntaxError type to split up Error from Expr
if C.jq_compile(jq, csrc) == 0 {
return errors.New(C.GoString(msg))
}
return nil
}
// NewJq returns an initialized state with a compiled program
// program should be a valid jq program/filter
// see http://stedolan.github.io/jq/manual/#Basicfilters for more info
func newJqExecutor(program string) (*jqExecutor, error) {
jq := &jqExecutor{
state: C.jq_init(),
}
if jq.state == nil {
return nil, errJqStateNil
}
pgm := C.CString(program)
defer C.free(unsafe.Pointer(pgm))
// Compiles a program into jq_state.
if ok := C.jq_compile(jq.state, pgm); ok != 1 {
jq.free()
return nil, errInvalidProgram
}
return jq, nil
}
func (jq *JQ) compile(program string) error {
_ = C.jq_compile(jq.state, C.CString(program))
return nil
}