[clang-format] Handle CRLF correctly when formatting escaped newlines

Subscribers: klimek

Differential Revision: https://reviews.llvm.org/D39420

Contributed by @peterbudai!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@316910 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Format/FormatTokenLexer.cpp

@@ -554,13 +554,21 @@ FormatToken *FormatTokenLexer::getNextToken() {
   // take them into account as whitespace - this pattern is quite frequent
   // in macro definitions.
   // FIXME: Add a more explicit test.
-  while (FormatTok->TokenText.size() > 1 && FormatTok->TokenText[0] == '\\' &&
-         FormatTok->TokenText[1] == '\n') {
+  while (FormatTok->TokenText.size() > 1 && FormatTok->TokenText[0] == '\\') {
+    unsigned SkippedWhitespace = 0;
+    if (FormatTok->TokenText.size() > 2 &&
+        (FormatTok->TokenText[1] == '\r' && FormatTok->TokenText[2] == '\n'))
+      SkippedWhitespace = 3;
+    else if (FormatTok->TokenText[1] == '\n')
+      SkippedWhitespace = 2;
+    else
+      break;
+
     ++FormatTok->NewlinesBefore;
-    WhitespaceLength += 2;
-    FormatTok->LastNewlineOffset = 2;
+    WhitespaceLength += SkippedWhitespace;
+    FormatTok->LastNewlineOffset = SkippedWhitespace;
     Column = 0;
-    FormatTok->TokenText = FormatTok->TokenText.substr(2);
+    FormatTok->TokenText = FormatTok->TokenText.substr(SkippedWhitespace);
   }
 
   FormatTok->WhitespaceRange = SourceRange(

unittests/Format/FormatTest.cpp

@@ -2629,14 +2629,39 @@ TEST_F(FormatTest, FormatUnbalancedStructuralElements) {
 }
 
 TEST_F(FormatTest, EscapedNewlines) {
-  EXPECT_EQ(
-      "#define A \\\n  int i;  \\\n  int j;",
-      format("#define A \\\nint i;\\\n  int j;", getLLVMStyleWithColumns(11)));
+  FormatStyle Narrow = getLLVMStyleWithColumns(11);
+  EXPECT_EQ("#define A \\\n  int i;  \\\n  int j;",
+            format("#define A \\\nint i;\\\n  int j;", Narrow));
   EXPECT_EQ("#define A\n\nint i;", format("#define A \\\n\n int i;"));
   EXPECT_EQ("template <class T> f();", format("\\\ntemplate <class T> f();"));
   EXPECT_EQ("/* \\  \\  \\\n */", format("\\\n/* \\  \\  \\\n */"));
   EXPECT_EQ("<a\n\\\\\n>", format("<a\n\\\\\n>"));
 
+  FormatStyle AlignLeft = getLLVMStyle();
+  AlignLeft.AlignEscapedNewlines = FormatStyle::ENAS_Left;
+  EXPECT_EQ("#define MACRO(x) \\\n"
+            "private:         \\\n"
+            "  int x(int a);\n",
+            format("#define MACRO(x) \\\n"
+                   "private:         \\\n"
+                   "  int x(int a);\n",
+                   AlignLeft));
+
+  // CRLF line endings
+  EXPECT_EQ("#define A \\\r\n  int i;  \\\r\n  int j;",
+            format("#define A \\\r\nint i;\\\r\n  int j;", Narrow));
+  EXPECT_EQ("#define A\r\n\r\nint i;", format("#define A \\\r\n\r\n int i;"));
+  EXPECT_EQ("template <class T> f();", format("\\\ntemplate <class T> f();"));
+  EXPECT_EQ("/* \\  \\  \\\r\n */", format("\\\r\n/* \\  \\  \\\r\n */"));
+  EXPECT_EQ("<a\r\n\\\\\r\n>", format("<a\r\n\\\\\r\n>"));
+  EXPECT_EQ("#define MACRO(x) \\\r\n"
+            "private:         \\\r\n"
+            "  int x(int a);\r\n",
+            format("#define MACRO(x) \\\r\n"
+                   "private:         \\\r\n"
+                   "  int x(int a);\r\n",
+                   AlignLeft));
+
   FormatStyle DontAlign = getLLVMStyle();
   DontAlign.AlignEscapedNewlines = FormatStyle::ENAS_DontAlign;
   DontAlign.MaxEmptyLinesToKeep = 3;
@@ -2659,7 +2684,8 @@ TEST_F(FormatTest, EscapedNewlines) {
                    "\\\n"
                    "  public: \\\n"
                    "    void baz(); \\\n"
-                   "  };", DontAlign));
+                   "  };",
+                   DontAlign));
 }
 
 TEST_F(FormatTest, CalculateSpaceOnConsecutiveLinesInMacro) {