From d19f3ac83441420365bff5e4ce21d1d2175bd8c2 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Mon, 13 Aug 2018 15:35:53 +0300
Subject: workspace symbols

---
 crates/libanalysis/src/lib.rs          | 29 +++++++++++++++++------------
 crates/libanalysis/src/symbol_index.rs | 28 ++++++++++++----------------
 2 files changed, 29 insertions(+), 28 deletions(-)

(limited to 'crates/libanalysis')

diff --git a/crates/libanalysis/src/lib.rs b/crates/libanalysis/src/lib.rs
index f0d0cf0a4..acaadb8a2 100644
--- a/crates/libanalysis/src/lib.rs
+++ b/crates/libanalysis/src/lib.rs
@@ -89,14 +89,15 @@ impl World {
         Ok(index.clone())
     }
 
-    pub fn world_symbols(&self, query: &str, f: &mut FnMut(&Path, &FileSymbol) -> Search) {
+    pub fn world_symbols<'a>(&'a self, query: &str) -> impl Iterator<Item=(&'a Path, &'a FileSymbol)> + 'a
+    {
         let q = Query::new(query);
-        for (path, data) in self.data.file_map.iter() {
-            let symbols = data.symbols(path.as_path());
-            if q.process(symbols, &mut |symbol| f(path, symbol)) == Search::Break {
-                break;
-            }
-        }
+        self.data.file_map.iter()
+            .flat_map(move |(path, data)| {
+                let path: &'a Path = path.as_path();
+                let symbols = data.symbols(path);
+                q.process(symbols).map(move |s| (path, s))
+            })
     }
 
     fn file_data(&self, path: &Path) -> Result<Arc<FileData>> {
@@ -107,11 +108,15 @@ impl World {
     }
 }
 
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub enum Search {
-    Continue,
-    Break,
-}
+
+pub type SearchResult = ::std::result::Result<Continue, Break>;
+
+pub struct Continue;
+
+pub struct Break;
+
+pub const CONTINUE: SearchResult = Ok(Continue);
+pub const BREAK: SearchResult = Err(Break);
 
 
 #[derive(Default, Debug)]
diff --git a/crates/libanalysis/src/symbol_index.rs b/crates/libanalysis/src/symbol_index.rs
index 1878fae99..4d90aac0c 100644
--- a/crates/libanalysis/src/symbol_index.rs
+++ b/crates/libanalysis/src/symbol_index.rs
@@ -5,8 +5,6 @@ use libsyntax2::{
 };
 use fst::{self, IntoStreamer};
 
-use Search;
-
 #[derive(Debug)]
 pub(crate) struct FileSymbols {
     symbols: Vec<FileSymbol>,
@@ -47,11 +45,10 @@ impl Query {
         Query { query, all_symbols }
     }
 
-    pub(crate) fn process(
+    pub(crate) fn process<'a>(
         &self,
-        file: &FileSymbols,
-        acc: &mut FnMut(&FileSymbol) -> Search,
-    ) -> Search {
+        file: &'a FileSymbols,
+    ) -> impl Iterator<Item=&'a FileSymbol> + 'a {
         fn is_type(kind: SyntaxKind) -> bool {
             match kind {
                 STRUCT | ENUM | TRAIT | TYPE_ITEM => true,
@@ -59,16 +56,15 @@ impl Query {
             }
         }
         let automaton = fst::automaton::Subsequence::new(&self.query);
-        for idx in file.map.search(automaton).into_stream().into_values() {
-            let idx = idx as usize;
-            let symbol = &file.symbols[idx];
-            if self.all_symbols || is_type(symbol.kind) {
-                if acc(&symbol) == Search::Break {
-                    return Search::Break;
-                }
-            }
-        }
-        Search::Continue
+        let all_symbols = self.all_symbols;
+        file.map.search(automaton).into_stream()
+            .into_values()
+            .into_iter()
+            .map(move |idx| {
+                let idx = idx as usize;
+                &file.symbols[idx]
+            })
+            .filter(move |s| all_symbols || is_type(s.kind))
     }
 }
 
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