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use crate::ast::{Ast, Block, CodeAttributes, Inline};
use anyhow::{anyhow, Context};
use pulldown_cmark::{Event, Tag};
pub(crate) enum InnerContent {
Blocks(Vec<Block>),
Inlines(Vec<Inline>),
}
impl InnerContent {
pub(crate) fn into_blocks(self) -> Vec<Block> {
if let InnerContent::Blocks(b) = self {
b
} else {
panic!("Expected blocks")
}
}
pub(crate) fn into_inlines(self) -> Vec<Inline> {
if let InnerContent::Inlines(i) = self {
i
} else {
panic!("Expected inlines")
}
}
pub(crate) fn blocks_mut(&mut self) -> anyhow::Result<&mut Vec<Block>> {
if let InnerContent::Blocks(b) = self {
Ok(b)
} else {
Err(anyhow!("Expected block element"))
}
}
#[allow(unused)]
fn inlines_mut(&mut self) -> anyhow::Result<&mut Vec<Inline>> {
if let InnerContent::Inlines(i) = self {
Ok(i)
} else {
Err(anyhow!("Expected inline element"))
}
}
pub(crate) fn push_inline(&mut self, item: Inline) {
match self {
InnerContent::Blocks(b) => b.push(Block::Plain(vec![item])),
InnerContent::Inlines(i) => i.push(item),
}
}
}
impl Ast {
pub(crate) fn make_from_iter<'a, T: IntoIterator<Item = Event<'a>>>(
iter: T,
) -> anyhow::Result<Self> {
let iter = iter.into_iter();
let mut inners = vec![InnerContent::Blocks(Vec::new())];
for event in iter {
match event {
Event::Start(t) => match t {
Tag::Paragraph
| Tag::Heading(_, _, _)
| Tag::BlockQuote
| Tag::CodeBlock(_)
| Tag::TableHead
| Tag::TableRow
| Tag::TableCell
| Tag::Emphasis
| Tag::Strong
| Tag::Strikethrough
| Tag::Image(_, _, _) => inners.push(InnerContent::Inlines(Vec::new())),
Tag::Link(_, _, _) => inners.push(InnerContent::Inlines(Vec::new())),
Tag::List(_) | Tag::Item | Tag::Table(_) | Tag::FootnoteDefinition(_) => {
inners.push(InnerContent::Blocks(Vec::new()))
}
},
Event::End(t) => {
let inner = inners.pop().expect("No inner content");
match t {
Tag::Paragraph => inners
.last_mut()
.unwrap()
.blocks_mut()
.context("for paragraph")?
.push(Block::Paragraph(inner.into_inlines())),
Tag::Heading(lvl, id, classes) => inners
.last_mut()
.unwrap()
.blocks_mut()
.context("for heading")?
.push(Block::Heading {
lvl,
id: id.map(|s| s.to_string()),
classes: classes.into_iter().map(|s| s.to_string()).collect(),
inner: inner.into_inlines(),
}),
Tag::BlockQuote => inners
.last_mut()
.unwrap()
.blocks_mut()
.context("for blockquote")?
.push(Block::BlockQuote(inner.into_inlines())),
Tag::CodeBlock(_) => {
inners
.last_mut()
.unwrap()
.blocks_mut()
.context("for code block")?
.push(Block::CodeBlock {
source: inner
.into_inlines()
.iter()
.map(|item| item.to_string())
.collect(),
reference: None,
attr: CodeAttributes::default(),
tags: None,
outputs: vec![],
});
}
Tag::List(idx) => inners
.last_mut()
.unwrap()
.blocks_mut()
.context("for list")?
.push(Block::List(idx, inner.into_blocks())),
Tag::Item => inners
.last_mut()
.unwrap()
.blocks_mut()
.context("for item")?
.push(Block::ListItem(inner.into_blocks())),
Tag::Emphasis => inners
.last_mut()
.unwrap()
.push_inline(Inline::Emphasis(inner.into_inlines())),
Tag::Strong => inners
.last_mut()
.unwrap()
.push_inline(Inline::Strong(inner.into_inlines())),
Tag::Strikethrough => inners
.last_mut()
.unwrap()
.push_inline(Inline::Strikethrough(inner.into_inlines())),
Tag::Link(tp, url, alt) => {
inners.last_mut().unwrap().push_inline(Inline::Link(
tp,
url.to_string(),
alt.to_string(),
inner.into_inlines(),
))
}
Tag::Image(tp, url, alt) => {
inners.last_mut().unwrap().push_inline(Inline::Image(
tp,
url.to_string(),
alt.to_string(),
inner.into_inlines(),
))
}
_ => {} // TODO: Unreachable
}
}
Event::Html(s) => {
inners
.last_mut()
.unwrap()
.push_inline(Inline::Html(s.into_string()));
}
other => {
let inner = match other {
Event::Text(s) => Inline::Text(s.into_string()),
Event::Code(s) => Inline::Code(s.into_string()),
Event::SoftBreak => Inline::SoftBreak,
Event::HardBreak => Inline::HardBreak,
Event::Rule => Inline::Rule,
_ => unreachable!(),
};
let c = inners.last_mut().unwrap();
c.push_inline(inner);
}
}
}
let blocks = inners.remove(0).into_blocks();
Ok(Ast(blocks))
}
}