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debug.rs
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debug.rs
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// Copyright 2020 John Millikin and the rust-fuse contributors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// SPDX-License-Identifier: Apache-2.0
use core::ascii;
use core::fmt;
#[inline]
#[must_use]
pub(crate) fn hex_u32(value: u32) -> impl fmt::Debug {
DebugHexU32(value)
}
struct DebugHexU32(u32);
impl fmt::Debug for DebugHexU32 {
#[inline]
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
// 8 hex digits + 2 for leading "0x".
write!(fmt, "{:#010X}", self.0)
}
}
#[inline]
#[must_use]
pub(crate) fn hex_u64(value: u64) -> impl fmt::Debug {
DebugHexU64(value)
}
struct DebugHexU64(u64);
impl fmt::Debug for DebugHexU64 {
#[inline]
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
// 16 hex digits + 2 for leading "0x".
write!(fmt, "{:#018X}", self.0)
}
}
#[inline]
#[must_use]
pub(crate) fn bytes<'a>(value: &'a [u8]) -> impl fmt::Debug + 'a {
DebugBytesAsString(value)
}
struct DebugBytesAsString<'a>(&'a [u8]);
impl fmt::Debug for DebugBytesAsString<'_> {
#[inline]
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
write!(fmt, "\"")?;
for byte in self.0.iter().flat_map(|&b| ascii::escape_default(b)) {
fmt::Write::write_char(fmt, byte as char)?;
}
write!(fmt, "\"")
}
}