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Simplify ast::Comment api surface

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This commit is contained in:
Lukas Wirth 2020-12-08 13:57:54 +01:00
parent 2facd9517f
commit 3174e941db
1 changed files with 15 additions and 10 deletions
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25
crates/syntax/src/ast/token_ext.rs
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@ -18,20 +18,21 @@ impl ast::Comment {
}
pub fn prefix(&self) -> &'static str {
let &(prefix, _kind) = CommentKind::with_prefix_from_text(self.text());
let &(prefix, _kind) = CommentKind::BY_PREFIX
.iter()
.find(|&(prefix, kind)| self.kind() == *kind && self.text().starts_with(prefix))
.unwrap();
prefix
}
pub fn kind_and_prefix(&self) -> &(&'static str, CommentKind) {
CommentKind::with_prefix_from_text(self.text())
}
/// Returns the textual content of a doc comment block as a single string.
/// That is, strips leading `///` (+ optional 1 character of whitespace),
/// trailing `*/`, trailing whitespace and then joins the lines.
pub fn doc_comment(&self) -> Option<&str> {
match self.kind_and_prefix() {
(prefix, CommentKind { shape, doc: Some(_) }) => {
let kind = self.kind();
match kind {
CommentKind { shape, doc: Some(_) } => {
let prefix = kind.prefix();
let text = &self.text().as_str()[prefix.len()..];
let ws = text.chars().next().filter(|c| c.is_whitespace());
let text = ws.map_or(text, |ws| &text[ws.len_utf8()..]);
@ -88,12 +89,16 @@ impl CommentKind {
];
pub(crate) fn from_text(text: &str) -> CommentKind {
let &(_prefix, kind) = Self::with_prefix_from_text(text);
let &(_prefix, kind) = CommentKind::BY_PREFIX
.iter()
.find(|&(prefix, _kind)| text.starts_with(prefix))
.unwrap();
kind
}
fn with_prefix_from_text(text: &str) -> &(&'static str, CommentKind) {
CommentKind::BY_PREFIX.iter().find(|&(prefix, _kind)| text.starts_with(prefix)).unwrap()
fn prefix(&self) -> &'static str {
let &(prefix, _) = CommentKind::BY_PREFIX.iter().find(|(_, kind)| kind == self).unwrap();
prefix
}
}