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-rw-r--r--crates/syntax/src/ast/token_ext.rs51
1 files changed, 23 insertions, 28 deletions
diff --git a/crates/syntax/src/ast/token_ext.rs b/crates/syntax/src/ast/token_ext.rs
index e4e512f2e..2661c753e 100644
--- a/crates/syntax/src/ast/token_ext.rs
+++ b/crates/syntax/src/ast/token_ext.rs
@@ -14,16 +14,15 @@ use crate::{
14 14
15impl ast::Comment { 15impl ast::Comment {
16 pub fn kind(&self) -> CommentKind { 16 pub fn kind(&self) -> CommentKind {
17 kind_by_prefix(self.text()) 17 CommentKind::from_text(self.text())
18 } 18 }
19 19
20 pub fn prefix(&self) -> &'static str { 20 pub fn prefix(&self) -> &'static str {
21 for (prefix, k) in COMMENT_PREFIX_TO_KIND.iter() { 21 let &(prefix, _kind) = CommentKind::BY_PREFIX
22 if *k == self.kind() && self.text().starts_with(prefix) { 22 .iter()
23 return prefix; 23 .find(|&(prefix, kind)| self.kind() == *kind && self.text().starts_with(prefix))
24 } 24 .unwrap();
25 } 25 prefix
26 unreachable!()
27 } 26 }
28} 27}
29 28
@@ -55,29 +54,25 @@ pub enum CommentPlacement {
55 Outer, 54 Outer,
56} 55}
57 56
58const COMMENT_PREFIX_TO_KIND: &[(&str, CommentKind)] = { 57impl CommentKind {
59 use {CommentPlacement::*, CommentShape::*}; 58 const BY_PREFIX: [(&'static str, CommentKind); 8] = [
60 &[ 59 ("/**/", CommentKind { shape: CommentShape::Block, doc: None }),
61 ("////", CommentKind { shape: Line, doc: None }), 60 ("////", CommentKind { shape: CommentShape::Line, doc: None }),
62 ("///", CommentKind { shape: Line, doc: Some(Outer) }), 61 ("///", CommentKind { shape: CommentShape::Line, doc: Some(CommentPlacement::Outer) }),
63 ("//!", CommentKind { shape: Line, doc: Some(Inner) }), 62 ("//!", CommentKind { shape: CommentShape::Line, doc: Some(CommentPlacement::Inner) }),
64 ("/**", CommentKind { shape: Block, doc: Some(Outer) }), 63 ("/**", CommentKind { shape: CommentShape::Block, doc: Some(CommentPlacement::Outer) }),
65 ("/*!", CommentKind { shape: Block, doc: Some(Inner) }), 64 ("/*!", CommentKind { shape: CommentShape::Block, doc: Some(CommentPlacement::Inner) }),
66 ("//", CommentKind { shape: Line, doc: None }), 65 ("//", CommentKind { shape: CommentShape::Line, doc: None }),
67 ("/*", CommentKind { shape: Block, doc: None }), 66 ("/*", CommentKind { shape: CommentShape::Block, doc: None }),
68 ] 67 ];
69};
70 68
71fn kind_by_prefix(text: &str) -> CommentKind { 69 pub(crate) fn from_text(text: &str) -> CommentKind {
72 if text == "/**/" { 70 let &(_prefix, kind) = CommentKind::BY_PREFIX
73 return CommentKind { shape: CommentShape::Block, doc: None }; 71 .iter()
74 } 72 .find(|&(prefix, _kind)| text.starts_with(prefix))
75 for (prefix, kind) in COMMENT_PREFIX_TO_KIND.iter() { 73 .unwrap();
76 if text.starts_with(prefix) { 74 kind
77 return *kind;
78 }
79 } 75 }
80 panic!("bad comment text: {:?}", text)
81} 76}
82 77
83impl ast::Whitespace { 78impl ast::Whitespace {