rust-analyzer - Unnamed repository; edit this file 'description' to name the repository.


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135

//! Various traits that are implemented by ast nodes.
//!
//! The implementations are usually trivial, and live in generated.rs
use either::Either;

use crate::{
    ast::{self, support, AstChildren, AstNode, AstToken},
    syntax_node::SyntaxElementChildren,
    SyntaxElement, SyntaxToken, T,
};

pub trait HasName: AstNode {
    fn name(&self) -> Option<ast::Name> {
        support::child(self.syntax())
    }
}

pub trait HasVisibility: AstNode {
    fn visibility(&self) -> Option<ast::Visibility> {
        support::child(self.syntax())
    }
}

pub trait HasLoopBody: AstNode {
    fn loop_body(&self) -> Option<ast::BlockExpr> {
        support::child(self.syntax())
    }

    fn label(&self) -> Option<ast::Label> {
        support::child(self.syntax())
    }
}

pub trait HasArgList: AstNode {
    fn arg_list(&self) -> Option<ast::ArgList> {
        support::child(self.syntax())
    }
}

pub trait HasModuleItem: AstNode {
    fn items(&self) -> AstChildren<ast::Item> {
        support::children(self.syntax())
    }
}

pub trait HasGenericParams: AstNode {
    fn generic_param_list(&self) -> Option<ast::GenericParamList> {
        support::child(self.syntax())
    }

    fn where_clause(&self) -> Option<ast::WhereClause> {
        support::child(self.syntax())
    }
}

pub trait HasTypeBounds: 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 HasAttrs: 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 HasDocComments: HasAttrs {
    fn doc_comments(&self) -> DocCommentIter {
        DocCommentIter { iter: self.syntax().children_with_tokens() }
    }
}

impl DocCommentIter {
    pub fn from_syntax_node(syntax_node: &ast::SyntaxNode) -> DocCommentIter {
        DocCommentIter { iter: syntax_node.children_with_tokens() }
    }

    #[cfg(test)]
    pub fn doc_comment_text(self) -> Option<String> {
        let docs = itertools::Itertools::join(
            &mut self.filter_map(|comment| comment.doc_comment().map(ToOwned::to_owned)),
            "\n",
        );
        if docs.is_empty() {
            None
        } else {
            Some(docs)
        }
    }
}

pub struct DocCommentIter {
    iter: SyntaxElementChildren,
}

impl Iterator for DocCommentIter {
    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).filter(ast::Comment::is_doc)
        })
    }
}

pub struct AttrDocCommentIter {
    iter: SyntaxElementChildren,
}

impl AttrDocCommentIter {
    pub fn from_syntax_node(syntax_node: &ast::SyntaxNode) -> AttrDocCommentIter {
        AttrDocCommentIter { iter: syntax_node.children_with_tokens() }
    }
}

impl Iterator for AttrDocCommentIter {
    type Item = Either<ast::Attr, ast::Comment>;
    fn next(&mut self) -> Option<Self::Item> {
        self.iter.by_ref().find_map(|el| match el {
            SyntaxElement::Node(node) => ast::Attr::cast(node).map(Either::Left),
            SyntaxElement::Token(tok) => {
                ast::Comment::cast(tok).filter(ast::Comment::is_doc).map(Either::Right)
            }
        })
    }
}

impl<A: HasName, B: HasName> HasName for Either<A, B> {}