[clang-format] [JS] Don't break between template string and tag
Before:
const x = veryLongIdentifier
`hello`;
After:
const x =
veryLongIdentifier`hello`;
While it's allowed to have the template string and tag identifier
separated by a line break, currently the clang-format output is not
stable when a break is forced. Additionally, disallowing a line break
makes it clear that the identifier is actually a tag for a template
string.
Patch originally by mitchellwills (thanks!).
llvm-svn: 356447
diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
index 246ac78..ef449e4 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -3171,6 +3171,11 @@
return false; // must not break in "module foo { ...}"
if (Right.is(TT_TemplateString) && Right.closesScope())
return false;
+ // Don't split tagged template literal so there is a break between the tag
+ // identifier and template string.
+ if (Left.is(tok::identifier) && Right.is(TT_TemplateString)) {
+ return false;
+ }
if (Left.is(TT_TemplateString) && Left.opensScope())
return true;
}
diff --git a/clang/unittests/Format/FormatTestJS.cpp b/clang/unittests/Format/FormatTestJS.cpp
index ed8faab..528e4cf 100644
--- a/clang/unittests/Format/FormatTestJS.cpp
+++ b/clang/unittests/Format/FormatTestJS.cpp
@@ -1962,6 +1962,12 @@
TEST_F(FormatTestJS, TaggedTemplateStrings) {
verifyFormat("var x = html`<ul>`;");
verifyFormat("yield `hello`;");
+ verifyFormat("var f = {\n"
+ " param: longTagName`This is a ${\n"
+ " 'really'} long line`\n"
+ "};",
+ "var f = {param: longTagName`This is a ${'really'} long line`};",
+ getGoogleJSStyleWithColumns(40));
}
TEST_F(FormatTestJS, CastSyntax) {