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use failure::Error;
use pest::iterators::Pair;
use crate::document_tree::{
HasChildren,
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 crate::url::Url;
use super::whitespace_normalize_name;
pub fn convert_inline(pair: Pair<Rule>) -> Result<c::TextOrInlineElement, Error> {
Ok(match pair.as_rule() {
Rule::str | Rule::str_nested => pair.as_str().into(),
Rule::ws_newline => " ".to_owned().into(),
Rule::reference => convert_reference(pair)?,
Rule::substitution_ref => convert_substitution_ref(pair)?.into(),
Rule::emph => e::Emphasis::with_children(convert_inlines(pair)?).into(),
Rule::strong => e::Strong::with_children(convert_inlines(pair)?).into(),
Rule::literal => e::Literal::with_children(convert_inlines(pair)?).into(),
rule => unimplemented!("unknown rule {:?}", rule),
})
}
pub fn convert_inlines(pair: Pair<Rule>) -> Result<Vec<c::TextOrInlineElement>, Error> {
pair.into_inner().map(convert_inline).collect()
}
fn convert_reference(pair: Pair<Rule>) -> Result<c::TextOrInlineElement, Error> {
let name;
let refuri;
let refid;
let mut refname = vec![];
let mut children: Vec<c::TextOrInlineElement> = vec![];
let concrete = pair.into_inner().next().unwrap();
match concrete.as_rule() {
Rule::reference_target => {
let rt_inner = concrete.into_inner().next().unwrap(); // reference_target_uq or target_name_qu
match rt_inner.as_rule() {
Rule::reference_target_uq => {
refid = None;
name = Some(rt_inner.as_str().into());
refuri = None;
refname.push(rt_inner.as_str().into());
children.push(rt_inner.as_str().into());
},
Rule::reference_target_qu => {
let (text, reference) = {
let mut text = None;
let mut reference = None;
for inner in rt_inner.clone().into_inner() {
match inner.as_rule() {
Rule::reference_text => text = Some(inner),
Rule::reference_bracketed => reference = Some(inner),
_ => unreachable!()
}
}
(text, reference)
};
let trimmed_text = match (&text, &reference) {
(Some(text), None) => text.as_str(),
(_, Some(reference)) => {
text
.map(|text| text.as_str().trim_end_matches(|ch| " \n\r".contains(ch)))
.filter(|text| !text.is_empty())
.unwrap_or_else(|| reference.clone().into_inner().next().unwrap().as_str())
}
(None, None) => unreachable!()
};
refid = None;
name = Some(trimmed_text.into());
refuri = if let Some(reference) = reference {
let inner = reference.into_inner().next().unwrap();
match inner.as_rule() {
// The URL rules in our parser accept a narrow superset of
// valid URLs, so we need to handle false positives.
Rule::url => if let Ok(target) = Url::parse_absolute(inner.as_str()) {
Some(target)
} else if inner.as_str().ends_with('_') {
// like target_name_qu (minus the final underscore)
let full_str = inner.as_str();
refname.push(full_str[0..full_str.len() - 1].into());
None
} else {
// like relative_reference
Some(Url::parse_relative(inner.as_str())?)
},
Rule::target_name_qu => {
refname.push(inner.as_str().into());
None
},
Rule::relative_reference => {
Some(Url::parse_relative(inner.as_str())?)
},
_ => unreachable!()
}
} else {
refname.push(trimmed_text.into());
None
};
children.push(trimmed_text.into());
},
_ => unreachable!()
}
},
Rule::reference_explicit => unimplemented!("explicit reference"),
Rule::reference_auto => {
let rt_inner = concrete.into_inner().next().unwrap();
match rt_inner.as_rule() {
Rule::url_auto => match Url::parse_absolute(rt_inner.as_str()) {
Ok(target) => {
refuri = Some(target);
name = None;
refid = None;
children.push(rt_inner.as_str().into());
},
// if our parser got a URL wrong, return it as a string
Err(_) => return Ok(rt_inner.as_str().into())
},
Rule::email => {
let mailto_url = String::from("mailto:") + rt_inner.as_str();
match Url::parse_absolute(&mailto_url) {
Ok(target) => {
refuri = Some(target);
name = None;
refid = None;
children.push(rt_inner.as_str().into());
},
// if our parser got a URL wrong, return it as a string
Err(_) => return Ok(rt_inner.as_str().into())
}
},
_ => unreachable!()
}
},
_ => unreachable!(),
};
Ok(e::Reference::new(
Default::default(),
a::Reference { name, refuri, refid, refname },
children
).into())
}
fn convert_substitution_ref(pair: Pair<Rule>) -> Result<e::SubstitutionReference, Error> {
let name = whitespace_normalize_name(pair.as_str());
Ok(a::ExtraAttributes::with_extra(
a::SubstitutionReference {
refname: vec![at::NameToken(name)]
}
))
}
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