From 7285207486d19a02ebbec9f75268f30479c55801 Mon Sep 17 00:00:00 2001
From: Alexander Kornienko <alexfh@google.com>
Date: Wed, 19 Jun 2013 14:22:47 +0000
Subject: [PATCH] Split long strings on word boundaries.

Summary: Split strings at word boundaries, when there are no spaces and slashes.

Reviewers: klimek

CC: cfe-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D1003

llvm-svn: 184304
---
 clang/lib/Format/BreakableToken.cpp   |  5 +++++
 clang/unittests/Format/FormatTest.cpp | 20 ++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/clang/lib/Format/BreakableToken.cpp b/clang/lib/Format/BreakableToken.cpp
index 48c1dee5bd7f..2b559cf8c3a2 100644
--- a/clang/lib/Format/BreakableToken.cpp
+++ b/clang/lib/Format/BreakableToken.cpp
@@ -77,6 +77,7 @@ BreakableToken::Split getStringSplit(StringRef Text,
                          encoding::getCodePointCount(Text, Encoding) - 1);
   StringRef::size_type SpaceOffset = 0;
   StringRef::size_type SlashOffset = 0;
+  StringRef::size_type WordStartOffset = 0;
   StringRef::size_type SplitPoint = 0;
   for (unsigned Chars = 0;;) {
     unsigned Advance;
@@ -95,6 +96,8 @@ BreakableToken::Split getStringSplit(StringRef Text,
       SpaceOffset = SplitPoint;
     if (Text[0] == '/')
       SlashOffset = SplitPoint;
+    if (Text[0] != '\\' && !isAlphanumeric(Text[0]))
+      WordStartOffset = SplitPoint;
 
     SplitPoint += Advance;
     Text = Text.substr(Advance);
@@ -104,6 +107,8 @@ BreakableToken::Split getStringSplit(StringRef Text,
     return BreakableToken::Split(SpaceOffset + 1, 0);
   if (SlashOffset != 0)
     return BreakableToken::Split(SlashOffset + 1, 0);
+  if (WordStartOffset != 0)
+    return BreakableToken::Split(WordStartOffset + 1, 0);
   if (SplitPoint != 0)
     return BreakableToken::Split(SplitPoint, 0);
   return BreakableToken::Split(StringRef::npos, 0);
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index 8454af32ed52..15a5d6b5746b 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -4636,6 +4636,26 @@ TEST_F(FormatTest, BreakStringLiterals) {
       "\"slashes\"",
       format("\"split/pathat/slashes\"", getLLVMStyleWithColumns(10)));
 
+  EXPECT_EQ(
+      "\"split/\"\n"
+      "\"pathat/\"\n"
+      "\"slashes\"",
+      format("\"split/pathat/slashes\"", getLLVMStyleWithColumns(10)));
+  EXPECT_EQ("\"split at \"\n"
+            "\"spaces/at/\"\n"
+            "\"slashes.at.any$\"\n"
+            "\"non-alphanumeric%\"\n"
+            "\"1111111111characte\"\n"
+            "\"rs\"",
+            format("\"split at "
+                   "spaces/at/"
+                   "slashes.at."
+                   "any$non-"
+                   "alphanumeric%"
+                   "1111111111characte"
+                   "rs\"",
+                   getLLVMStyleWithColumns(20)));
+
   FormatStyle AlignLeft = getLLVMStyleWithColumns(12);
   AlignLeft.AlignEscapedNewlinesLeft = true;
   EXPECT_EQ(