From 9623e77d9f24b6ff8e718f7321a92081997ea1e9 Mon Sep 17 00:00:00 2001
From: pcpthm <pcpthm@gmail.com>
Date: Fri, 22 Mar 2019 03:27:00 +0900
Subject: Fix reparsing bug when lex result is different

---
 crates/ra_syntax/src/parsing/reparsing.rs                 | 11 +++++++++--
 crates/ra_syntax/tests/data/reparse/fuzz-failures/0001.rs |  4 ++++
 crates/ra_syntax/tests/data/reparse/fuzz-failures/0002.rs |  4 ++++
 3 files changed, 17 insertions(+), 2 deletions(-)
 create mode 100644 crates/ra_syntax/tests/data/reparse/fuzz-failures/0001.rs
 create mode 100644 crates/ra_syntax/tests/data/reparse/fuzz-failures/0002.rs

diff --git a/crates/ra_syntax/src/parsing/reparsing.rs b/crates/ra_syntax/src/parsing/reparsing.rs
index b44cca49d..3b5471bf8 100644
--- a/crates/ra_syntax/src/parsing/reparsing.rs
+++ b/crates/ra_syntax/src/parsing/reparsing.rs
@@ -33,10 +33,10 @@ pub(crate) fn incremental_reparse(
 }
 
 fn reparse_leaf<'node>(
-    node: &'node SyntaxNode,
+    root: &'node SyntaxNode,
     edit: &AtomTextEdit,
 ) -> Option<(&'node SyntaxNode, GreenNode, Vec<SyntaxError>)> {
-    let node = algo::find_covering_node(node, edit.delete);
+    let node = algo::find_covering_node(root, edit.delete);
     match node.kind() {
         WHITESPACE | COMMENT | IDENT | STRING | RAW_STRING => {
             let text = get_text_after_edit(node, &edit);
@@ -50,6 +50,13 @@ fn reparse_leaf<'node>(
                 return None;
             }
 
+            if let Some(next_char) = root.text().char_at(node.range().end()) {
+                let tokens_with_next_char = tokenize(&format!("{}{}", text, next_char));
+                if tokens_with_next_char.len() == 1 {
+                    return None;
+                }
+            }
+
             let green = GreenNode::new_leaf(node.kind(), text.into());
             let new_errors = vec![];
             Some((node, green, new_errors))
diff --git a/crates/ra_syntax/tests/data/reparse/fuzz-failures/0001.rs b/crates/ra_syntax/tests/data/reparse/fuzz-failures/0001.rs
new file mode 100644
index 000000000..d2d42c6f9
--- /dev/null
+++ b/crates/ra_syntax/tests/data/reparse/fuzz-failures/0001.rs
@@ -0,0 +1,4 @@
+0
+1
+
+bb"
\ No newline at end of file
diff --git a/crates/ra_syntax/tests/data/reparse/fuzz-failures/0002.rs b/crates/ra_syntax/tests/data/reparse/fuzz-failures/0002.rs
new file mode 100644
index 000000000..3fbee1548
--- /dev/null
+++ b/crates/ra_syntax/tests/data/reparse/fuzz-failures/0002.rs
@@ -0,0 +1,4 @@
+1
+1
+
+""!
\ No newline at end of file
-- 
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