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use super::{segment_str, Block, Color, LinkTag, Links, MetaTag, Modifier, Style, Word};
use pulldown_cmark::{Event, Tag};
use std::ops::Range;
use term_rustdoc::util::{ToCompactString, XString};
macro_rules! ele {
($iter:ident, $tag:ident, $range:ident) => {
$iter
.by_ref()
.take_while(|(e, r)| {
!(*e == ::pulldown_cmark::Event::End(::pulldown_cmark::TagEnd::$tag)
&& *r == $range)
})
.collect::<Vec<_>>()
.into_iter()
};
(#heading $iter:ident, $level:ident, $range:ident) => {
$iter
.by_ref()
.take_while(|(e, r)| {
!(*e == ::pulldown_cmark::Event::End(::pulldown_cmark::TagEnd::Heading($level))
&& *r == $range)
})
.collect::<Vec<_>>()
.into_iter()
};
(#list $iter:ident, $ordered:expr, $range:ident) => {
$iter
.by_ref()
.take_while(|(e, r)| {
!(*e == ::pulldown_cmark::Event::End(::pulldown_cmark::TagEnd::List($ordered))
&& *r == $range)
})
.collect::<Vec<_>>()
.into_iter()
};
}
pub type EventRange<'doc> = (Event<'doc>, Range<usize>);
pub struct Element<'doc, 'block, 'links, I> {
doc: &'doc str,
iter: I,
block: &'block mut Block,
links: &'links mut Links,
}
impl<'doc, 'block, 'links, I> Element<'doc, 'block, 'links, I>
where
I: Iterator<Item = EventRange<'doc>>,
{
pub fn new(
doc: &'doc str,
block: &'block mut Block,
links: &'links mut Links,
iter: I,
) -> Self {
Element {
doc,
iter,
block,
links,
}
}
pub fn parse_paragraph(self) {
let Element {
doc,
iter,
block,
links,
} = self;
// FIXME: We can remove some branches on List/Item. But for now, let's keep it simple.
super::list::parse(&mut 0, None, iter, block, doc, links);
// while let Some((event, range)) = para.next() {
// match event {
// Event::Text(text) => block.push_normal_words(&text),
// Event::Start(Tag::Link { dest_url, .. }) => {
// Element::new(doc, block, links, ele!(para, Link, range)).parse_link(&dest_url);
// }
// Event::Start(Tag::Emphasis) => {
// Element::new(doc, block, links, ele!(para, Emphasis, range)).parse_emphasis();
// }
// Event::Start(Tag::Strong) => {
// Element::new(doc, block, links, ele!(para, Strong, range)).parse_strong();
// }
// Event::Start(Tag::Strikethrough) => {
// Element::new(doc, block, links, ele!(para, Strikethrough, range))
// .parse_strike_through();
// }
// Event::Code(intra_code) => parse_intra_code(&intra_code, block),
// Event::SoftBreak | Event::HardBreak => block.push_a_word(Word {
// // To indicate there is a whitespace in case the last word in this line
// // and word in next line are on the same line with whitespace separator after wrapping.
// trailling_whitespace: true,
// ..Default::default()
// }),
// Event::FootnoteReference(key) => block.push_a_word(Word {
// word: "[^_]".into(),
// style: Style {
// fg: Some(Color::LightMagenta),
// ..Default::default()
// },
// tag: MetaTag::Link(LinkTag::Footnote((&*key).into())),
// trailling_whitespace: false,
// }),
// Event::Start(Tag::Image { dest_url, .. }) => {
// Element::new(doc, block, links, ele!(para, Image, range))
// .parse_image(&dest_url);
// }
// Event::TaskListMarker(done) => task_maker(done, block),
// _ => (),
// }
// }
}
/// TODO: support local/external crate item links
pub fn parse_link(self, link: &str) {
let Element {
mut iter,
block,
links,
..
} = self;
let idx = links.push_link(link.into());
block.push_link(idx);
let tag = MetaTag::Link(LinkTag::ReferenceLink(idx));
let style = LINK;
let alink = |word| Word {
word,
style,
tag: tag.clone(),
trailling_whitespace: false,
};
block.push_a_word(alink(XString::new_inline("[")));
while let Some((event, range)) = iter.next() {
match event {
Event::Text(words) => {
block.push_words(&words, style, tag.clone());
}
Event::Code(code) => {
parse_intra_code_in_link(&code, block);
}
Event::Start(Tag::Emphasis) => {
let style = style.add_modifier(Modifier::ITALIC);
// we use for-loop here to discard further nested styles
for (event, _) in ele!(iter, Emphasis, range) {
if let Event::Text(words) = event {
block.push_words(&words, style, tag.clone());
}
}
}
Event::Start(Tag::Strong) => {
let style = style.add_modifier(Modifier::BOLD);
for (event, _) in ele!(iter, Strong, range) {
if let Event::Text(words) = event {
block.push_words(&words, style, tag.clone());
}
}
}
Event::Start(Tag::Strikethrough) => {
let style = style.add_modifier(Modifier::CROSSED_OUT);
for (event, _) in ele!(iter, Strikethrough, range) {
if let Event::Text(words) = event {
block.push_words(&words, style, tag.clone());
}
}
}
_ => (),
}
}
block.push_a_word(alink(XString::new_inline("]")));
block.push_a_word(alink(XString::new_inline("[")));
block.push_a_word(alink(idx.to_compact_string()));
block.push_a_word(alink(XString::new_inline("]")));
}
/// Images are like links, e.g. `![ref]` are valid syntax, or ``.
/// But when parsing them, don't show further styles and just truncate the img line if too long.
pub fn parse_image(self, link: &str) {
let Element { iter, block, .. } = self;
let tag = MetaTag::Image;
let style = Style {
fg: Some(Color::Rgb(192, 192, 192)), // #C0C0C0
..Default::default()
};
let mut img = String::with_capacity(32);
img.push_str("![");
for (event, _) in iter {
if let Event::Text(words) = event {
img.push_str(&words)
}
}
img.push_str("](");
img.push_str(link);
img.push(')');
img.shrink_to_fit();
block.push_a_word(Word {
word: img.into(),
style,
tag,
trailling_whitespace: false,
});
}
// Used in `parse_{emphasis,strong,strike_through}`.
//
// FIXME: the nested styles are simplified as follows:
// * only one kind style is applied to Text
// * intra_code and links are not applied
// but we could support real nested styles because add_modifier is additive
fn parse_nested_styles(self, style: Style) {
let Element {
doc,
mut iter,
block,
links,
} = self;
while let Some((event, range)) = iter.next() {
match event {
Event::Text(text) => {
block.push_words(&text, style, MetaTag::Normal);
}
Event::Code(code) => parse_intra_code(&code, block),
Event::Start(Tag::Link { dest_url, .. }) => {
let iter = ele!(iter, Link, range);
Element::new(doc, block, links, iter).parse_link(&dest_url);
}
Event::SoftBreak | Event::HardBreak => block.push_a_word(Word {
word: "".into(),
style,
tag: MetaTag::Normal,
trailling_whitespace: true,
}),
_ => (),
}
}
}
pub fn parse_emphasis(self) {
let style = Style {
add_modifier: Modifier::ITALIC,
..Default::default()
};
self.parse_nested_styles(style);
}
pub fn parse_strong(self) {
let style = Style {
add_modifier: Modifier::BOLD,
..Default::default()
};
self.parse_nested_styles(style);
}
pub fn parse_strike_through(self) {
let style = Style {
add_modifier: Modifier::CROSSED_OUT,
..Default::default()
};
self.parse_nested_styles(style);
}
}
pub const LINK: Style = Style {
fg: Some(Color::Rgb(30, 144, 255)), // #1E90FF
add_modifier: Modifier::empty(),
bg: None,
underline_color: None,
sub_modifier: Modifier::empty(),
};
const INTRA_CODE: Style = Style {
fg: Some(Color::Rgb(255, 184, 162)), // #FFB8A2
bg: None,
underline_color: None,
add_modifier: Modifier::empty(),
sub_modifier: Modifier::empty(),
};
pub const FOOTNOTE: Style = Style {
fg: Some(Color::LightMagenta),
bg: None,
underline_color: None,
add_modifier: Modifier::empty(),
sub_modifier: Modifier::empty(),
};
pub fn parse_intra_code(code: &str, block: &mut Block) {
fn word(s: &str) -> Word {
Word {
word: s.into(),
style: INTRA_CODE,
tag: MetaTag::InlineCode,
trailling_whitespace: false,
}
}
block.push_a_word(word("`"));
segment_str(code, |s| {
block.push_a_word(word(s));
});
let end = word("`");
block.push_a_word(end);
}
pub fn parse_intra_code_in_link(code: &str, block: &mut Block) {
fn word(s: &str, style: Style) -> Word {
Word {
word: s.into(),
style,
tag: MetaTag::InlineCode,
trailling_whitespace: false,
}
}
let tick = word("`", INTRA_CODE);
block.push_a_word(tick.clone());
segment_str(code, |s| {
let word = word(s, LINK);
block.push_a_word(word);
});
block.push_a_word(tick);
}