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use failure::{Error,bail};
use pest::iterators::Pair;
use crate::document_tree::{
Element,HasChildren,ExtraAttributes,
elements as e,
element_categories as c,
extra_attributes as a,
attribute_types as at
};
use crate::parser::{
pest_rst::Rule,
pair_ext_parse::PairExt,
};
use super::{whitespace_normalize_name, inline::convert_inlines};
#[derive(PartialEq)]
pub(super) enum TitleKind { Double(char), Single(char) }
pub(super) enum TitleOrSsubel {
Title(e::Title, TitleKind),
Ssubel(c::StructuralSubElement),
}
pub(super) fn convert_ssubel(pair: Pair<Rule>) -> Result<Option<TitleOrSsubel>, Error> {
use self::TitleOrSsubel::*;
Ok(Some(match pair.as_rule() {
Rule::title => { let (t, k) = convert_title(pair)?; Title(t, k) },
//TODO: subtitle, decoration, docinfo
Rule::EOI => return Ok(None),
_ => Ssubel(convert_substructure(pair)?.into()),
}))
}
fn convert_substructure(pair: Pair<Rule>) -> Result<c::SubStructure, Error> {
Ok(match pair.as_rule() {
// todo: Topic, Sidebar, Transition
// no section here, as it’s constructed from titles
_ => convert_body_elem(pair)?.into(),
})
}
fn convert_body_elem(pair: Pair<Rule>) -> Result<c::BodyElement, Error> {
Ok(match pair.as_rule() {
Rule::paragraph => convert_paragraph(pair)?.into(),
Rule::target => convert_target(pair)?.into(),
Rule::substitution_def => convert_substitution_def(pair)?.into(),
Rule::admonition_gen => convert_admonition_gen(pair)?.into(),
Rule::image => convert_image::<e::Image>(pair)?.into(),
Rule::bullet_list => convert_bullet_list(pair)?.into(),
rule => unimplemented!("unhandled rule {:?}", rule),
})
}
fn convert_title(pair: Pair<Rule>) -> Result<(e::Title, TitleKind), Error> {
let mut title: Option<String> = None;
let mut title_inlines: Option<Vec<c::TextOrInlineElement>> = None;
let mut adornment_char: Option<char> = None;
// title_double or title_single. Extract kind before consuming
let inner_pair = pair.into_inner().next().unwrap();
let kind = inner_pair.as_rule();
for p in inner_pair.into_inner() {
match p.as_rule() {
Rule::line => {
title = Some(p.as_str().to_owned());
title_inlines = Some(convert_inlines(p)?);
},
Rule::adornments => adornment_char = Some(p.as_str().chars().next().expect("Empty adornment?")),
rule => unimplemented!("Unexpected rule in title: {:?}", rule),
};
}
// now we encountered one line of text and one of adornments
// TODO: emit error if the adornment line is too short (has to match title length)
let mut elem = e::Title::with_children(title_inlines.expect("No text in title"));
if let Some(title) = title {
//TODO: slugify properly
let slug = title.to_lowercase().replace("\n", "").replace(" ", "-");
elem.names_mut().push(at::NameToken(slug));
}
let title_kind = match kind {
Rule::title_double => TitleKind::Double(adornment_char.unwrap()),
Rule::title_single => TitleKind::Single(adornment_char.unwrap()),
_ => unreachable!(),
};
Ok((elem, title_kind))
}
fn convert_paragraph(pair: Pair<Rule>) -> Result<e::Paragraph, Error> {
Ok(e::Paragraph::with_children(convert_inlines(pair)?))
}
fn convert_target(pair: Pair<Rule>) -> Result<e::Target, Error> {
let mut elem: e::Target = Default::default();
elem.extra_mut().anonymous = false;
for p in pair.into_inner() {
match p.as_rule() {
Rule::target_name_uq | Rule::target_name_qu => {
elem.ids_mut().push(p.as_str().into());
elem.names_mut().push(p.as_str().into());
},
// TODO: also handle non-urls
Rule::link_target => elem.extra_mut().refuri = Some(p.parse()?),
rule => panic!("Unexpected rule in target: {:?}", rule),
}
}
Ok(elem)
}
fn convert_substitution_def(pair: Pair<Rule>) -> Result<e::SubstitutionDefinition, Error> {
let mut pairs = pair.into_inner();
let name = whitespace_normalize_name(pairs.next().unwrap().as_str()); // Rule::substitution_name
let inner_pair = pairs.next().unwrap();
let inner: Vec<c::TextOrInlineElement> = match inner_pair.as_rule() {
Rule::replace => convert_replace(inner_pair)?,
Rule::image => vec![convert_image::<e::ImageInline>(inner_pair)?.into()],
rule => panic!("Unknown substitution rule {:?}", rule),
};
let mut subst_def = e::SubstitutionDefinition::with_children(inner);
subst_def.names_mut().push(at::NameToken(name));
Ok(subst_def)
}
fn convert_replace(pair: Pair<Rule>) -> Result<Vec<c::TextOrInlineElement>, Error> {
let mut pairs = pair.into_inner();
let paragraph = pairs.next().unwrap();
convert_inlines(paragraph)
}
fn convert_image<I>(pair: Pair<Rule>) -> Result<I, Error> where I: Element + ExtraAttributes<a::Image> {
let mut pairs = pair.into_inner();
let mut image = I::with_extra(a::Image::new(
pairs.next().unwrap().as_str().trim().parse()?, // line
));
for opt in pairs {
let mut opt_iter = opt.into_inner();
let opt_name = opt_iter.next().unwrap();
let opt_val = opt_iter.next().unwrap();
match opt_name.as_str() {
"class" => image.classes_mut().push(opt_val.as_str().to_owned()),
"name" => image.names_mut().push(opt_val.as_str().into()),
"alt" => image.extra_mut().alt = Some(opt_val.as_str().to_owned()),
"height" => image.extra_mut().height = Some(opt_val.parse()?),
"width" => image.extra_mut().width = Some(opt_val.parse()?),
"scale" => image.extra_mut().scale = Some(parse_scale(&opt_val)?),
"align" => image.extra_mut().align = Some(opt_val.parse()?),
"target" => image.extra_mut().target = Some(opt_val.parse()?),
name => bail!("Unknown Image option {}", name),
}
}
Ok(image)
}
fn parse_scale(pair: &Pair<Rule>) -> Result<u8, Error> {
let input = if pair.as_str().chars().rev().next() == Some('%') { &pair.as_str()[..pair.as_str().len()-1] } else { pair.as_str() };
use pest::error::{Error,ErrorVariant};
Ok(input.parse().map_err(|e: std::num::ParseIntError| {
let var: ErrorVariant<Rule> = ErrorVariant::CustomError { message: e.to_string() };
Error::new_from_span(var, pair.as_span())
})?)
}
fn convert_admonition_gen(pair: Pair<Rule>) -> Result<c::BodyElement, Error> {
let mut iter = pair.into_inner();
let typ = iter.next().unwrap().as_str();
// TODO: in reality it contains body elements.
let children: Vec<c::BodyElement> = iter.map(|p| e::Paragraph::with_children(vec![p.as_str().into()]).into()).collect();
Ok(match typ {
"attention" => e::Attention::with_children(children).into(),
"hint" => e::Hint::with_children(children).into(),
"note" => e::Note::with_children(children).into(),
"caution" => e::Caution::with_children(children).into(),
"danger" => e::Danger::with_children(children).into(),
"error" => e::Error::with_children(children).into(),
"important" => e::Important::with_children(children).into(),
"tip" => e::Tip::with_children(children).into(),
"warning" => e::Warning::with_children(children).into(),
typ => panic!("Unknown admontion type {}!", typ),
})
}
fn convert_bullet_list(pair: Pair<Rule>) -> Result<e::BulletList, Error> {
Ok(e::BulletList::with_children(pair.into_inner().map(convert_bullet_item).collect::<Result<_, _>>()?))
}
fn convert_bullet_item(pair: Pair<Rule>) -> Result<e::ListItem, Error> {
let mut iter = pair.into_inner();
let mut children: Vec<c::BodyElement> = vec![
convert_paragraph(iter.next().unwrap())?.into()
];
for p in iter {
children.push(convert_body_elem(p)?);
}
Ok(e::ListItem::with_children(children))
}
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