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[rust.git] / crates / rust-analyzer / src / semantic_tokens.rs
1 //! Semantic Tokens helpers
2
3 use std::ops;
4
5 use lsp_types::{Range, SemanticToken, SemanticTokenModifier, SemanticTokenType, SemanticTokens};
6
7 macro_rules! define_semantic_token_types {
8     ($(($ident:ident, $string:literal)),*$(,)?) => {
9         $(pub(crate) const $ident: SemanticTokenType = SemanticTokenType::new($string);)*
10
11         pub(crate) const SUPPORTED_TYPES: &[SemanticTokenType] = &[
12             SemanticTokenType::COMMENT,
13             SemanticTokenType::KEYWORD,
14             SemanticTokenType::STRING,
15             SemanticTokenType::NUMBER,
16             SemanticTokenType::REGEXP,
17             SemanticTokenType::OPERATOR,
18             SemanticTokenType::NAMESPACE,
19             SemanticTokenType::TYPE,
20             SemanticTokenType::STRUCT,
21             SemanticTokenType::CLASS,
22             SemanticTokenType::INTERFACE,
23             SemanticTokenType::ENUM,
24             SemanticTokenType::TYPE_PARAMETER,
25             SemanticTokenType::FUNCTION,
26             SemanticTokenType::MEMBER,
27             SemanticTokenType::PROPERTY,
28             SemanticTokenType::MACRO,
29             SemanticTokenType::VARIABLE,
30             SemanticTokenType::PARAMETER,
31             SemanticTokenType::LABEL,
32             $($ident),*
33         ];
34     };
35 }
36
37 define_semantic_token_types![
38     (ATTRIBUTE, "attribute"),
39     (BOOLEAN, "boolean"),
40     (BUILTIN_TYPE, "builtinType"),
41     (ENUM_MEMBER, "enumMember"),
42     (ESCAPE_SEQUENCE, "escapeSequence"),
43     (FORMAT_SPECIFIER, "formatSpecifier"),
44     (GENERIC, "generic"),
45     (LIFETIME, "lifetime"),
46     (SELF_KEYWORD, "selfKeyword"),
47     (TYPE_ALIAS, "typeAlias"),
48     (UNION, "union"),
49     (UNRESOLVED_REFERENCE, "unresolvedReference"),
50 ];
51
52 macro_rules! define_semantic_token_modifiers {
53     ($(($ident:ident, $string:literal)),*$(,)?) => {
54         $(pub(crate) const $ident: SemanticTokenModifier = SemanticTokenModifier::new($string);)*
55
56         pub(crate) const SUPPORTED_MODIFIERS: &[SemanticTokenModifier] = &[
57             SemanticTokenModifier::DOCUMENTATION,
58             SemanticTokenModifier::DECLARATION,
59             SemanticTokenModifier::DEFINITION,
60             SemanticTokenModifier::STATIC,
61             SemanticTokenModifier::ABSTRACT,
62             SemanticTokenModifier::DEPRECATED,
63             SemanticTokenModifier::READONLY,
64             $($ident),*
65         ];
66     };
67 }
68
69 define_semantic_token_modifiers![
70     (CONSTANT, "constant"),
71     (CONTROL_FLOW, "controlFlow"),
72     (INJECTED, "injected"),
73     (MUTABLE, "mutable"),
74     (UNSAFE, "unsafe"),
75     (ATTRIBUTE_MODIFIER, "attribute"),
76 ];
77
78 #[derive(Default)]
79 pub(crate) struct ModifierSet(pub(crate) u32);
80
81 impl ops::BitOrAssign<SemanticTokenModifier> for ModifierSet {
82     fn bitor_assign(&mut self, rhs: SemanticTokenModifier) {
83         let idx = SUPPORTED_MODIFIERS.iter().position(|it| it == &rhs).unwrap();
84         self.0 |= 1 << idx;
85     }
86 }
87
88 /// Tokens are encoded relative to each other.
89 ///
90 /// This is a direct port of https://github.com/microsoft/vscode-languageserver-node/blob/f425af9de46a0187adb78ec8a46b9b2ce80c5412/server/src/sematicTokens.proposed.ts#L45
91 #[derive(Default)]
92 pub(crate) struct SemanticTokensBuilder {
93     prev_line: u32,
94     prev_char: u32,
95     data: Vec<SemanticToken>,
96 }
97
98 impl SemanticTokensBuilder {
99     /// Push a new token onto the builder
100     pub fn push(&mut self, range: Range, token_index: u32, modifier_bitset: u32) {
101         let mut push_line = range.start.line as u32;
102         let mut push_char = range.start.character as u32;
103
104         if !self.data.is_empty() {
105             push_line -= self.prev_line;
106             if push_line == 0 {
107                 push_char -= self.prev_char;
108             }
109         }
110
111         // A token cannot be multiline
112         let token_len = range.end.character - range.start.character;
113
114         let token = SemanticToken {
115             delta_line: push_line,
116             delta_start: push_char,
117             length: token_len as u32,
118             token_type: token_index,
119             token_modifiers_bitset: modifier_bitset,
120         };
121
122         self.data.push(token);
123
124         self.prev_line = range.start.line as u32;
125         self.prev_char = range.start.character as u32;
126     }
127
128     pub fn build(self) -> SemanticTokens {
129         SemanticTokens { result_id: None, data: self.data }
130     }
131 }
132
133 pub fn type_index(type_: SemanticTokenType) -> u32 {
134     SUPPORTED_TYPES.iter().position(|it| *it == type_).unwrap() as u32
135 }