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|
//! Itemized list.
use crate::paragraph::{
Error as ParagraphError,
Paragraph,
PartError as ParagraphPartError,
};
use crate::xml::element::{Element, FromElements};
/// Itemized list.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct ItemizedList
{
items: Vec<Item>,
}
impl ItemizedList
{
/// Returns a new `ItemizedList`.
pub fn new(entries: impl IntoIterator<Item = Item>) -> Self
{
Self {
items: entries.into_iter().collect(),
}
}
/// Returns the itemized list's items.
#[must_use]
pub fn items(&self) -> &[Item]
{
&self.items
}
}
impl FromElements for ItemizedList
{
type Error = Error;
fn from_elements(
elements: &crate::xml::element::Elements,
) -> Result<Self, Self::Error>
{
let items = elements
.get_all_tagged_elements_with_name("listitem")
.into_iter()
.map(|entry_elem| Item::from_elements(entry_elem.child_elements()))
.collect::<Result<Vec<_>, _>>()?;
Ok(Self { items })
}
}
/// [`ItemizedList`] error.
#[derive(Debug, thiserror::Error)]
pub enum Error
{
/// Invalid item.
#[error("Invalid item")]
InvalidItem(#[from] ItemError),
}
/// Itemized list item.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Item
{
paragraphs: Vec<Paragraph>,
}
impl Item
{
/// Returns a new `Item`.
pub fn new(paragraphs: impl IntoIterator<Item = Paragraph>) -> Self
{
Self {
paragraphs: paragraphs.into_iter().collect(),
}
}
/// Returns the itemized list item paragraphs.
#[must_use]
pub fn paragraphs(&self) -> &[Paragraph]
{
&self.paragraphs
}
}
impl FromElements for Item
{
type Error = ItemError;
fn from_elements(
elements: &crate::xml::element::Elements,
) -> Result<Self, Self::Error>
{
let item = elements
.into_iter()
.filter_map(|elem| match elem {
Element::Tagged(tagged_elem) if tagged_elem.name() == "para" => {
Some(tagged_elem)
}
_ => None,
})
.map(|para_elem| Paragraph::from_elements(para_elem.child_elements()))
.collect::<Result<Vec<_>, _>>()
.map_err(|err| Self::Error::InvalidItemParagraph(Box::new(err)))?;
Ok(Self { paragraphs: item })
}
}
/// [`Item`] error.
#[derive(Debug, thiserror::Error)]
pub enum ItemError
{
/// Missing tagged element with name 'term'.
#[error("Missing tagged element with name 'term'")]
MissingTerm,
/// Missing tagged element with name 'listitem'.
#[error("Missing tagged element with name 'listitem'")]
MissingListItem,
/// Invalid term.
#[error("Invalid term")]
InvalidTerm(#[source] Box<ParagraphPartError>),
/// Invalid item paragraph.
#[error("Invalid item paragraph")]
InvalidItemParagraph(#[source] Box<ParagraphError>),
}
#[cfg(test)]
mod tests
{
use super::*;
use crate::paragraph::Part as ParagraphPart;
use crate::xml::element::{Element, Elements, Tagged};
#[test]
fn itemized_list_from_elements_works()
{
let itemized_list = ItemizedList::from_elements(&Elements::from([
Element::Tagged(Tagged::new(
&"listitem",
[Element::Tagged(Tagged::new(
&"para",
[Element::Text("Hello hello.".to_string())],
[],
))],
[],
)),
Element::Tagged(Tagged::new(
&"listitem",
[Element::Tagged(Tagged::new(
&"para",
[
Element::Text("Tosche station".to_string()),
Element::Text("Power converters".to_string()),
],
[],
))],
[],
)),
Element::Tagged(Tagged::new(
&"listitem",
[Element::Tagged(Tagged::new(
&"para",
[Element::Text("It's a trap".to_string())],
[],
))],
[],
)),
]))
.expect("Expected Ok");
assert_eq!(itemized_list.items.len(), 3);
}
#[test]
fn item_from_elements_works()
{
let item = Item::from_elements(&Elements::from([
Element::Tagged(Tagged::new(&"para", [Element::Text("bar".to_string())], [])),
Element::Tagged(Tagged::new(
&"para",
[Element::Text("Hello there.".to_string())],
[],
)),
]))
.expect("Expected Ok");
assert_eq!(
item.paragraphs,
vec![
Paragraph::new([ParagraphPart::Text("bar".to_string())]),
Paragraph::new([ParagraphPart::Text("Hello there.".to_string())]),
]
);
}
}
|
