From f51457a643b768794092f73add6dda4aecd400a1 Mon Sep 17 00:00:00 2001
From: Lukas Wirth <lukastw97@gmail.com>
Date: Thu, 14 Jan 2021 18:35:22 +0100
Subject: Group file source edits by FileId

---
 crates/ide_db/src/source_change.rs | 54 +++++++++++++++++++++++++++++---------
 1 file changed, 42 insertions(+), 12 deletions(-)

(limited to 'crates/ide_db')

diff --git a/crates/ide_db/src/source_change.rs b/crates/ide_db/src/source_change.rs
index 10c0abdac..516d7859a 100644
--- a/crates/ide_db/src/source_change.rs
+++ b/crates/ide_db/src/source_change.rs
@@ -3,12 +3,18 @@
 //!
 //! It can be viewed as a dual for `AnalysisChange`.
 
+use std::{
+    collections::hash_map::Entry,
+    iter::{self, FromIterator},
+};
+
 use base_db::{AnchoredPathBuf, FileId};
+use rustc_hash::FxHashMap;
 use text_edit::TextEdit;
 
 #[derive(Default, Debug, Clone)]
 pub struct SourceChange {
-    pub source_file_edits: Vec<SourceFileEdit>,
+    pub source_file_edits: SourceFileEdits,
     pub file_system_edits: Vec<FileSystemEdit>,
     pub is_snippet: bool,
 }
@@ -17,27 +23,51 @@ impl SourceChange {
     /// Creates a new SourceChange with the given label
     /// from the edits.
     pub fn from_edits(
-        source_file_edits: Vec<SourceFileEdit>,
+        source_file_edits: SourceFileEdits,
         file_system_edits: Vec<FileSystemEdit>,
     ) -> Self {
         SourceChange { source_file_edits, file_system_edits, is_snippet: false }
     }
 }
 
-#[derive(Debug, Clone)]
-pub struct SourceFileEdit {
-    pub file_id: FileId,
-    pub edit: TextEdit,
+#[derive(Default, Debug, Clone)]
+pub struct SourceFileEdits {
+    pub edits: FxHashMap<FileId, TextEdit>,
+}
+
+impl SourceFileEdits {
+    pub fn from_text_edit(file_id: FileId, edit: TextEdit) -> Self {
+        SourceFileEdits { edits: FxHashMap::from_iter(iter::once((file_id, edit))) }
+    }
+
+    pub fn len(&self) -> usize {
+        self.edits.len()
+    }
+
+    pub fn is_empty(&self) -> bool {
+        self.edits.is_empty()
+    }
+
+    pub fn insert(&mut self, file_id: FileId, edit: TextEdit) {
+        match self.edits.entry(file_id) {
+            Entry::Occupied(mut entry) => {
+                entry.get_mut().union(edit).expect("overlapping edits for same file");
+            }
+            Entry::Vacant(entry) => {
+                entry.insert(edit);
+            }
+        }
+    }
 }
 
-impl From<SourceFileEdit> for SourceChange {
-    fn from(edit: SourceFileEdit) -> SourceChange {
-        vec![edit].into()
+impl Extend<(FileId, TextEdit)> for SourceFileEdits {
+    fn extend<T: IntoIterator<Item = (FileId, TextEdit)>>(&mut self, iter: T) {
+        iter.into_iter().for_each(|(file_id, edit)| self.insert(file_id, edit));
     }
 }
 
-impl From<Vec<SourceFileEdit>> for SourceChange {
-    fn from(source_file_edits: Vec<SourceFileEdit>) -> SourceChange {
+impl From<SourceFileEdits> for SourceChange {
+    fn from(source_file_edits: SourceFileEdits) -> SourceChange {
         SourceChange { source_file_edits, file_system_edits: Vec::new(), is_snippet: false }
     }
 }
@@ -51,7 +81,7 @@ pub enum FileSystemEdit {
 impl From<FileSystemEdit> for SourceChange {
     fn from(edit: FileSystemEdit) -> SourceChange {
         SourceChange {
-            source_file_edits: Vec::new(),
+            source_file_edits: Default::default(),
             file_system_edits: vec![edit],
             is_snippet: false,
         }
-- 
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