/*
Portions Copyright 2019-2021 ZomboDB, LLC.
Portions Copyright 2021-2022 Technology Concepts & Design, Inc. <support@tcdi.com>
All rights reserved.
Use of this source code is governed by the MIT license that can be found in the LICENSE file.
*/
//! Helper functions and such for Postgres' various query tree `Node`s
use crate::pg_sys;
/// #define IsA(nodeptr,_type_) (nodeTag(nodeptr) == T_##_type_)
#[inline]
pub unsafe fn is_a(nodeptr: *mut pg_sys::Node, tag: pg_sys::NodeTag) -> bool {
!nodeptr.is_null() && nodeptr.as_ref().unwrap().type_ == tag
}
/// Convert a [pg_sys::Node] into its textual representation
///
/// ### Safety
///
/// We cannot guarantee the provided `nodeptr` is a valid pointer
pub unsafe fn node_to_string<'a>(nodeptr: *mut pg_sys::Node) -> Option<&'a str> {
if nodeptr.is_null() {
None
} else {
let string = pg_sys::nodeToString(nodeptr as crate::void_ptr);
if string.is_null() {
None
} else {
Some(
std::ffi::CStr::from_ptr(string)
.to_str()
.expect("unable to convert Node into a &str"),
)
}
}
}