85 lines
2.8 KiB
Rust
85 lines
2.8 KiB
Rust
// Copyright 2018 Trent Clarke.
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
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// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
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// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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// Generates an implementation of the Debug trait for a type that defers to the
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// Debug implementation for a given field.
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macro_rules! derive_debug_via_id {
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($typename:ident) => {
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impl ::core::fmt::Debug for $typename {
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fn fmt(&self, f: &mut ::core::fmt::Formatter) -> Result<(), ::core::fmt::Error> {
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::core::fmt::Debug::fmt(&self.id, f)
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}
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}
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};
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}
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macro_rules! derive_debug_via_field {
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($type:ty, $field:ident) => {
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derive_debug_via_field!($type, stringify!($type), $field);
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};
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($type:ty, $typename:expr, $field:ident) => {
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impl ::core::fmt::Debug for $type {
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fn fmt(&self, f: &mut ::core::fmt::Formatter) -> Result<(), ::core::fmt::Error> {
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f.debug_struct($typename)
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.field(stringify!($field), &self.$field)
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.finish()
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}
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}
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};
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}
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// Generates an implementation of the Debug trait for a type that outputs the
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// hex encoding of the byte slice representation of the value.
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macro_rules! derive_debug_self_as_ref_hex_bytes {
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($typename:ident) => {
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impl ::core::fmt::Debug for $typename {
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fn fmt(&self, f: &mut ::core::fmt::Formatter) -> Result<(), ::core::fmt::Error> {
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crate::debug::write_hex_tuple(f, stringify!($typename), self)
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}
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}
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};
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}
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pub(crate) fn write_hex_tuple(
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fmt: &mut core::fmt::Formatter,
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type_name: &str,
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value: &dyn AsRef<[u8]>,
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) -> Result<(), ::core::fmt::Error> {
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fmt.debug_tuple(type_name)
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.field(&HexStr(value.as_ref()))
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.finish()
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}
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struct HexStr<'a>(pub &'a [u8]);
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impl core::fmt::Debug for HexStr<'_> {
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fn fmt(&self, fmt: &mut core::fmt::Formatter) -> Result<(), core::fmt::Error> {
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fmt.write_str("\"")?;
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write_hex_bytes(fmt, self.0)?;
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fmt.write_str("\"")?;
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Ok(())
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}
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}
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pub(crate) fn write_hex_bytes(
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fmt: &mut core::fmt::Formatter,
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bytes: &[u8],
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) -> Result<(), ::core::fmt::Error> {
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for byte in bytes {
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write!(fmt, "{:02x}", byte)?;
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}
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Ok(())
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}
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