From 5287a2506c19b7f886556f8a73510f57dd234857 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Tue, 2 Apr 2019 12:18:52 +0300
Subject: More future-proof comment kind

---
 crates/ra_syntax/src/ast/tokens.rs | 83 +++++++++++++++++++++++---------------
 crates/ra_syntax/src/ast/traits.rs |  2 +-
 2 files changed, 52 insertions(+), 33 deletions(-)

(limited to 'crates/ra_syntax')

diff --git a/crates/ra_syntax/src/ast/tokens.rs b/crates/ra_syntax/src/ast/tokens.rs
index 76a12cd64..7c30ff15c 100644
--- a/crates/ra_syntax/src/ast/tokens.rs
+++ b/crates/ra_syntax/src/ast/tokens.rs
@@ -21,52 +21,71 @@ impl<'a> AstToken<'a> for Comment<'a> {
 }
 
 impl<'a> Comment<'a> {
-    pub fn flavor(&self) -> CommentFlavor {
-        let text = self.text();
-        if text.starts_with("///") {
-            CommentFlavor::OuterDoc
-        } else if text.starts_with("//!") {
-            CommentFlavor::InnerDoc
-        } else if text.starts_with("//") {
-            CommentFlavor::Line
-        } else {
-            CommentFlavor::Multiline
-        }
-    }
-
-    pub fn is_doc_comment(&self) -> bool {
-        self.flavor().is_doc_comment()
+    pub fn kind(&self) -> CommentKind {
+        kind_by_prefix(self.text())
     }
 
     pub fn prefix(&self) -> &'static str {
-        self.flavor().prefix()
+        prefix_by_kind(self.kind())
     }
 }
 
-#[derive(Debug, PartialEq, Eq)]
-pub enum CommentFlavor {
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub struct CommentKind {
+    pub shape: CommentShape,
+    pub doc: Option<CommentPlacement>,
+}
+
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub enum CommentShape {
     Line,
-    OuterDoc,
-    InnerDoc,
-    Multiline,
+    Block,
 }
 
-impl CommentFlavor {
-    pub fn prefix(&self) -> &'static str {
-        match *self {
-            CommentFlavor::Line => "//",
-            CommentFlavor::OuterDoc => "///",
-            CommentFlavor::InnerDoc => "//!",
-            CommentFlavor::Multiline => "/*",
+impl CommentShape {
+    pub fn is_line(self) -> bool {
+        self == CommentShape::Line
+    }
+
+    pub fn is_block(self) -> bool {
+        self == CommentShape::Block
+    }
+}
+
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub enum CommentPlacement {
+    Inner,
+    Outer,
+}
+
+const COMMENT_PREFIX_TO_KIND: &[(&str, CommentKind)] = {
+    use {CommentShape::*, CommentPlacement::*};
+    &[
+        ("///", CommentKind { shape: Line, doc: Some(Outer) }),
+        ("//!", CommentKind { shape: Line, doc: Some(Inner) }),
+        ("/**", CommentKind { shape: Block, doc: Some(Outer) }),
+        ("/**", CommentKind { shape: Block, doc: Some(Inner) }),
+        ("//", CommentKind { shape: Line, doc: None }),
+        ("/*", CommentKind { shape: Block, doc: None }),
+    ]
+};
+
+fn kind_by_prefix(text: &str) -> CommentKind {
+    for (prefix, kind) in COMMENT_PREFIX_TO_KIND.iter() {
+        if text.starts_with(prefix) {
+            return *kind;
         }
     }
+    panic!("bad comment text: {:?}", text)
+}
 
-    pub fn is_doc_comment(&self) -> bool {
-        match self {
-            CommentFlavor::OuterDoc | CommentFlavor::InnerDoc => true,
-            _ => false,
+fn prefix_by_kind(kind: CommentKind) -> &'static str {
+    for (prefix, k) in COMMENT_PREFIX_TO_KIND.iter() {
+        if *k == kind {
+            return prefix;
         }
     }
+    unreachable!()
 }
 
 pub struct Whitespace<'a>(SyntaxToken<'a>);
diff --git a/crates/ra_syntax/src/ast/traits.rs b/crates/ra_syntax/src/ast/traits.rs
index 43d1509fa..98aa22085 100644
--- a/crates/ra_syntax/src/ast/traits.rs
+++ b/crates/ra_syntax/src/ast/traits.rs
@@ -111,7 +111,7 @@ pub trait DocCommentsOwner: AstNode {
         let mut has_comments = false;
         let docs = self
             .doc_comments()
-            .filter(|comment| comment.is_doc_comment())
+            .filter(|comment| comment.kind().doc.is_some())
             .map(|comment| {
                 has_comments = true;
                 let prefix_len = comment.prefix().len();
-- 
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