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use super::{html, markdown_v2, Nesting};
use std::{
fmt::{self, Formatter, Write},
ops::Deref,
};
#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash)]
#[must_use = "formatters need to be formatted with `markdown_v2` or `html`"]
pub struct CodeBlock<C, L = &'static str> {
code: C,
language: Option<L>,
}
impl<C, L: Deref<Target = str>> CodeBlock<C, L> {
pub fn language(mut self, language: L) -> Self {
if language.deref().contains('\n') {
panic!(
"[tbot] A code block's language may not contain line breaks: {}",
language.deref(),
);
}
if language.deref().contains('"') {
panic!(
"[tbot] A code block's language may not contain quotes: {}",
language.deref(),
);
}
self.language = Some(language);
self
}
}
pub fn code_block<I, T, L>(code: I) -> CodeBlock<I, L>
where
for<'a> &'a I: IntoIterator<Item = &'a T>,
T: Deref<Target = str>,
L: Deref<Target = str>,
{
CodeBlock {
code,
language: None,
}
}
impl<I, T, L> markdown_v2::Formattable for CodeBlock<I, L>
where
for<'a> &'a I: IntoIterator<Item = &'a T>,
T: Deref<Target = str>,
L: Deref<Target = str>,
{
fn format(&self, formatter: &mut Formatter, _: Nesting) -> fmt::Result {
formatter.write_str("```")?;
if let Some(language) = &self.language {
language
.deref()
.chars()
.map(|x| {
if markdown_v2::ESCAPED_CODE_CHARACTERS.contains(&x) {
formatter.write_char('\\')?;
}
formatter.write_char(x)
})
.collect::<Result<(), _>>()?;
}
formatter.write_char('\n')?;
(&self.code)
.into_iter()
.flat_map(|x| x.deref().chars())
.map(|x| {
if markdown_v2::ESCAPED_CODE_CHARACTERS.contains(&x) {
formatter.write_char('\\')?;
}
formatter.write_char(x)
})
.collect::<Result<(), _>>()?;
formatter.write_str("\n```")
}
}
impl<I, T, L> html::Formattable for CodeBlock<I, L>
where
for<'a> &'a I: IntoIterator<Item = &'a T>,
T: Deref<Target = str>,
L: Deref<Target = str>,
{
fn format(
&self,
formatter: &mut Formatter,
nesting: Nesting,
) -> fmt::Result {
formatter.write_str("<pre>")?;
if let Some(language) = &self.language {
write!(
formatter,
"<code class=\"language-{}\">",
language.deref()
)?;
}
(&self.code)
.into_iter()
.map(|x| html::Formattable::format(&&**x, formatter, nesting))
.collect::<Result<(), _>>()?;
if self.language.is_some() {
formatter.write_str("</code>")?;
}
formatter.write_str("</pre>")
}
}