70 lines
2.3 KiB
Rust
70 lines
2.3 KiB
Rust
//! Copied from
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//! https://github.com/rust-lang/rust/blob/6b3ae3f6e45a33c2d95fa0362c9b2593e567fd34/library/core/src/fmt/builders.rs#L102
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// Copyright (c) The Rust Project Contributors
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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use std::fmt;
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pub struct PadAdapter<'buf, 'state> {
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buf: &'buf mut (dyn fmt::Write + 'buf),
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state: &'state mut PadAdapterState,
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}
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pub struct PadAdapterState {
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on_newline: bool,
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}
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impl Default for PadAdapterState {
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fn default() -> Self {
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PadAdapterState { on_newline: true }
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}
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}
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impl<'buf, 'state> PadAdapter<'buf, 'state> {
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pub fn wrap<'slot, 'fmt: 'buf + 'slot>(
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fmt: &'fmt mut fmt::Formatter<'_>,
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state: &'state mut PadAdapterState,
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) -> Self {
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PadAdapter { buf: fmt, state }
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}
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}
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impl fmt::Write for PadAdapter<'_, '_> {
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fn write_str(&mut self, s: &str) -> fmt::Result {
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for s in s.split_inclusive('\n') {
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if self.state.on_newline {
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self.buf.write_str(" ")?;
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}
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self.state.on_newline = s.ends_with('\n');
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self.buf.write_str(s)?;
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}
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Ok(())
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}
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fn write_char(&mut self, c: char) -> fmt::Result {
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if self.state.on_newline {
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self.buf.write_str(" ")?;
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}
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self.state.on_newline = c == '\n';
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self.buf.write_char(c)
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}
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}
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