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/// `CompletionItem` describes a single completion variant in the editor pop-up.
/// It is basically a POD with various properties. To construct a
/// `CompletionItem`, use `new` method and the `Builder` struct.
#[derive(Debug)]
pub struct CompletionItem {
label: String,
lookup: Option<String>,
snippet: Option<String>,
}
pub enum InsertText {
PlainText { text: String },
Snippet { text: String },
}
impl CompletionItem {
pub(crate) fn new(label: impl Into<String>) -> Builder {
let label = label.into();
Builder {
label,
lookup: None,
snippet: None,
}
}
/// What user sees in pop-up in the UI.
pub fn label(&self) -> &str {
&self.label
}
/// What string is used for filtering.
pub fn lookup(&self) -> &str {
self.lookup
.as_ref()
.map(|it| it.as_str())
.unwrap_or(self.label())
}
/// What is inserted.
pub fn insert_text(&self) -> InsertText {
match &self.snippet {
None => InsertText::PlainText {
text: self.label.clone(),
},
Some(it) => InsertText::Snippet { text: it.clone() },
}
}
}
/// A helper to make `CompletionItem`s.
#[must_use]
pub(crate) struct Builder {
label: String,
lookup: Option<String>,
snippet: Option<String>,
}
impl Builder {
pub fn add_to(self, acc: &mut Completions) {
acc.add(self.build())
}
pub fn build(self) -> CompletionItem {
CompletionItem {
label: self.label,
lookup: self.lookup,
snippet: self.snippet,
}
}
pub fn lookup_by(mut self, lookup: impl Into<String>) -> Builder {
self.lookup = Some(lookup.into());
self
}
pub fn snippet(mut self, snippet: impl Into<String>) -> Builder {
self.snippet = Some(snippet.into());
self
}
}
impl Into<CompletionItem> for Builder {
fn into(self) -> CompletionItem {
self.build()
}
}
/// Represents an in-progress set of completions being built.
#[derive(Debug, Default)]
pub(crate) struct Completions {
buf: Vec<CompletionItem>,
}
impl Completions {
pub(crate) fn add(&mut self, item: impl Into<CompletionItem>) {
self.buf.push(item.into())
}
pub(crate) fn add_all<I>(&mut self, items: I)
where
I: IntoIterator,
I::Item: Into<CompletionItem>,
{
items.into_iter().for_each(|item| self.add(item.into()))
}
}
impl Into<Vec<CompletionItem>> for Completions {
fn into(self) -> Vec<CompletionItem> {
self.buf
}
}
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