80 lines
1.9 KiB
Rust
80 lines
1.9 KiB
Rust
use std::fmt;
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use super::DnsLabelRef;
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/// Customize formatting of DNS labels
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///
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/// The default uses "." as separator and adds a trailing separator.
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///
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/// The `Debug` formatters just format as `Display` to a String and then
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/// format that string as `Debug`.
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#[derive(Clone,Copy,PartialEq,Eq,PartialOrd,Ord,Hash,Debug)]
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pub struct DisplayLabelsOptions {
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/// separator to insert between (escaped) labels
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pub separator: &'static str,
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/// whether a trailing separator is added.
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///
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/// without a trailing separator the root zone is represented as
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/// empty string!
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pub trailing: bool,
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}
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impl Default for DisplayLabelsOptions {
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fn default() -> Self {
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DisplayLabelsOptions{
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separator: ".",
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trailing: true,
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}
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}
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}
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/// Wrap anything representing a collection of labels (`DnsLabelRef`) to
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/// format using the given `options`.
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///
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/// As name you can pass any cloneable `(Into)Iterator` with
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/// `DnsLabelRef` items, e.g:
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///
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/// * `&DnsName`
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/// * `DnsNameIterator`
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#[derive(Clone)]
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pub struct DisplayLabels<'a, I>
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where
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I: IntoIterator<Item=DnsLabelRef<'a>>+Clone
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{
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/// Label collection to iterate over
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pub labels: I,
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/// Options
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pub options: DisplayLabelsOptions,
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}
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impl<'a, I> fmt::Debug for DisplayLabels<'a, I>
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where
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I: IntoIterator<Item=DnsLabelRef<'a>>+Clone
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{
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fn fmt(&self, w: &mut fmt::Formatter) -> fmt::Result {
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// just escape the display version1
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format!("{}", self).fmt(w)
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}
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}
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impl<'a, I> fmt::Display for DisplayLabels<'a, I>
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where
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I: IntoIterator<Item=DnsLabelRef<'a>>+Clone
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{
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fn fmt(&self, w: &mut fmt::Formatter) -> fmt::Result {
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let mut i = self.labels.clone().into_iter();
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if let Some(first_label) = i.next() {
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// first label
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fmt::Display::fmt(&first_label, w)?;
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// remaining labels
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while let Some(label) = i.next() {
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w.write_str(self.options.separator)?;
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fmt::Display::fmt(&label, w)?;
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}
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}
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if self.options.trailing {
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w.write_str(self.options.separator)?;
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}
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Ok(())
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}
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}
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