From 6a07b6af6b294f87f2cc06a41f88738d6b7961dc Mon Sep 17 00:00:00 2001
From: Naman Kumar <naman@outlook.in>
Date: Mon, 18 May 2020 11:05:54 +0530
Subject: [PATCH] block-string: print multi line for trailing backslash

---
 src/language/__tests__/.blockString-test.js.swp | Bin 0 -> 16384 bytes
 src/language/__tests__/blockString-test.js      |   7 +++++++
 src/language/blockString.js                     |   6 +++++-
 3 files changed, 12 insertions(+), 1 deletion(-)
 create mode 100644 src/language/__tests__/.blockString-test.js.swp

diff --git a/src/language/__tests__/.blockString-test.js.swp b/src/language/__tests__/.blockString-test.js.swp
new file mode 100644
index 0000000000000000000000000000000000000000..bbad20578d107cd2b79f23d25a1e880c8a4afead
GIT binary patch
literal 16384
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literal 0
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diff --git a/src/language/__tests__/blockString-test.js b/src/language/__tests__/blockString-test.js
index dced428f3a..efd7abbd45 100644
--- a/src/language/__tests__/blockString-test.js
+++ b/src/language/__tests__/blockString-test.js
@@ -155,6 +155,13 @@ describe('printBlockString', () => {
     );
   });
 
+  it('correctly prints single-line with trailing backslash', () => {
+    const str = 'backslash \\';
+
+    expect(printBlockString(str)).to.equal('"""\nbackslash \\\n"""');
+    expect(printBlockString(str, '', true)).to.equal('"""\nbackslash \\\n"""');
+  });
+
   it('correctly prints string with a first line indentation', () => {
     const str = joinLines(
       '    first  ',
diff --git a/src/language/blockString.js b/src/language/blockString.js
index dba151a125..d8ec8fb49d 100644
--- a/src/language/blockString.js
+++ b/src/language/blockString.js
@@ -85,8 +85,12 @@ export function printBlockString(
   const isSingleLine = value.indexOf('\n') === -1;
   const hasLeadingSpace = value[0] === ' ' || value[0] === '\t';
   const hasTrailingQuote = value[value.length - 1] === '"';
+  const hasTrailingSlash = value[value.length - 1] === '\\';
   const printAsMultipleLines =
-    !isSingleLine || hasTrailingQuote || preferMultipleLines;
+    !isSingleLine ||
+    hasTrailingQuote ||
+    hasTrailingSlash ||
+    preferMultipleLines;
 
   let result = '';
   // Format a multi-line block quote to account for leading space.