clang-format: [JS] Fix character counting in template strings.

Some counts were off, we don't need to take the leading newlines of the
first ` into account and some tests were just wrong.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@241257 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Format/Format.cpp

@@ -837,7 +837,7 @@ private:
         EndBacktick->OriginalColumn + EndBacktick->ColumnWidth;
     for (auto I = Tokens.rbegin() + 1, E = Tokens.rend(); I != E; I++) {
       ++TokenCount;
-      if (I[0]->NewlinesBefore > 0 || I[0]->IsMultiline)
+      if (I[0]->IsMultiline)
         IsMultiline = true;
 
       // If there was a preceding template string, this must be the start of a
@@ -853,9 +853,10 @@ private:
           EndColumnInFirstLine = I[0]->OriginalColumn + I[0]->ColumnWidth;
         // If the token has newlines, the token before it (if it exists) is the
         // rhs end of the previous line.
-        if (I[0]->NewlinesBefore > 0 && (I + 1 != E))
+        if (I[0]->NewlinesBefore > 0 && (I + 1 != E)) {
           EndColumnInFirstLine = I[1]->OriginalColumn + I[1]->ColumnWidth;
-
+          IsMultiline = true;
+        }
         continue;
       }
 
@@ -888,7 +889,8 @@ private:
         //     until here`;
         Tokens.back()->ColumnWidth =
             EndColumnInFirstLine - Tokens.back()->OriginalColumn;
-        Tokens.back()->LastLineColumnWidth = EndOriginalColumn;
+        // +1 for the ` itself.
+        Tokens.back()->LastLineColumnWidth = EndOriginalColumn + 1;
         Tokens.back()->IsMultiline = true;
       } else {
         // Token simply spans from start to end, +1 for the ` itself.
@@ -1080,7 +1082,6 @@ private:
           break;
         default:
           FormatTok->Type = TT_ImplicitStringLiteral;
-          ++Column;
           break;
         }
       }

unittests/Format/FormatTestJS.cpp

@@ -795,15 +795,11 @@ TEST_F(FormatTestJS, TemplateStrings) {
                    "     ${  name    }\n"
                    "  !`;"));
 
-  // FIXME: +1 / -1 offsets are to work around clang-format miscalculating
-  // widths for unknown tokens that are not whitespace (e.g. '`'). Remove when
-  // the code is corrected.
-
   verifyFormat("var x =\n"
                "    `hello ${world}` >= some();",
                getGoogleJSStyleWithColumns(34)); // Barely doesn't fit.
   verifyFormat("var x = `hello ${world}` >= some();",
-               getGoogleJSStyleWithColumns(35 + 1)); // Barely fits.
+               getGoogleJSStyleWithColumns(35)); // Barely fits.
   EXPECT_EQ("var x = `hello\n"
             "  ${world}` >=\n"
             "        some();",
@@ -818,10 +814,14 @@ TEST_F(FormatTestJS, TemplateStrings) {
                    "  ${world}` >= some();",
                    getGoogleJSStyleWithColumns(22))); // Barely fits.
 
-  verifyFormat("var x =\n    `h`;", getGoogleJSStyleWithColumns(13 - 1));
+  verifyFormat("var x =\n"
+               "    `h`;",
+               getGoogleJSStyleWithColumns(11));
   EXPECT_EQ(
       "var x =\n    `multi\n  line`;",
-      format("var x = `multi\n  line`;", getGoogleJSStyleWithColumns(14 - 1)));
+      format("var x = `multi\n  line`;", getGoogleJSStyleWithColumns(13)));
+  verifyFormat("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(\n"
+               "    `aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa`);");
 
   // Make sure template strings get a proper ColumnWidth assigned, even if they
   // are first token in line.