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|
//! Various traits that are implemented by ast nodes.
//!
//! The implementations are usually trivial, and live in generated.rs
use stdx::SepBy;
use crate::{
ast::{self, support, AstChildren, AstNode, AstToken},
syntax_node::SyntaxElementChildren,
SyntaxToken, T,
};
pub trait TypeAscriptionOwner: AstNode {
fn ascribed_type(&self) -> Option<ast::TypeRef> {
support::child(self.syntax())
}
}
pub trait NameOwner: AstNode {
fn name(&self) -> Option<ast::Name> {
support::child(self.syntax())
}
}
pub trait VisibilityOwner: AstNode {
fn visibility(&self) -> Option<ast::Visibility> {
support::child(self.syntax())
}
}
pub trait LoopBodyOwner: AstNode {
fn loop_body(&self) -> Option<ast::BlockExpr> {
support::child(self.syntax())
}
fn label(&self) -> Option<ast::Label> {
support::child(self.syntax())
}
}
pub trait ArgListOwner: AstNode {
fn arg_list(&self) -> Option<ast::ArgList> {
support::child(self.syntax())
}
}
pub trait ModuleItemOwner: AstNode {
fn items(&self) -> AstChildren<ast::Item> {
support::children(self.syntax())
}
}
pub trait TypeParamsOwner: AstNode {
fn type_param_list(&self) -> Option<ast::TypeParamList> {
support::child(self.syntax())
}
fn where_clause(&self) -> Option<ast::WhereClause> {
support::child(self.syntax())
}
}
pub trait TypeBoundsOwner: AstNode {
fn type_bound_list(&self) -> Option<ast::TypeBoundList> {
support::child(self.syntax())
}
fn colon_token(&self) -> Option<SyntaxToken> {
support::token(self.syntax(), T![:])
}
}
pub trait AttrsOwner: AstNode {
fn attrs(&self) -> AstChildren<ast::Attr> {
support::children(self.syntax())
}
fn has_atom_attr(&self, atom: &str) -> bool {
self.attrs().filter_map(|x| x.as_simple_atom()).any(|x| x == atom)
}
}
pub trait DocCommentsOwner: AstNode {
fn doc_comments(&self) -> CommentIter {
CommentIter { iter: self.syntax().children_with_tokens() }
}
fn doc_comment_text(&self) -> Option<String> {
self.doc_comments().doc_comment_text()
}
}
impl CommentIter {
pub fn from_syntax_node(syntax_node: &ast::SyntaxNode) -> CommentIter {
CommentIter { iter: syntax_node.children_with_tokens() }
}
/// 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_text(self) -> Option<String> {
let mut has_comments = false;
let docs = self
.filter(|comment| comment.kind().doc.is_some())
.map(|comment| {
has_comments = true;
let prefix_len = comment.prefix().len();
let line: &str = comment.text().as_str();
// Determine if the prefix or prefix + 1 char is stripped
let pos =
if let Some(ws) = line.chars().nth(prefix_len).filter(|c| c.is_whitespace()) {
prefix_len + ws.len_utf8()
} else {
prefix_len
};
let end = if comment.kind().shape.is_block() && line.ends_with("*/") {
line.len() - 2
} else {
line.len()
};
// Note that we do not trim the end of the line here
// since whitespace can have special meaning at the end
// of a line in markdown.
line[pos..end].to_owned()
})
.sep_by("\n")
.to_string();
if has_comments {
Some(docs)
} else {
None
}
}
}
pub struct CommentIter {
iter: SyntaxElementChildren,
}
impl Iterator for CommentIter {
type Item = ast::Comment;
fn next(&mut self) -> Option<ast::Comment> {
self.iter.by_ref().find_map(|el| el.into_token().and_then(ast::Comment::cast))
}
}
|
