Clang-format: parse for and while loops

Summary: Adds support for formatting for and while loops.

Reviewers: djasper, klimek

Reviewed By: klimek

CC: cfe-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D174

llvm-svn: 169387

clang/lib/Format/UnwrappedLineParser.cpp

@@ -121,6 +121,10 @@ void UnwrappedLineParser::parseStatement() {
   case tok::kw_if:
     parseIfThenElse();
     return;
+  case tok::kw_for:
+  case tok::kw_while:
+    parseForOrWhileLoop();
+    return;
   case tok::kw_do:
     parseDoWhile();
     return;
@@ -219,6 +223,22 @@ void UnwrappedLineParser::parseIfThenElse() {
   }
 }
 
+void UnwrappedLineParser::parseForOrWhileLoop() {
+  assert((FormatTok.Tok.is(tok::kw_for) || FormatTok.Tok.is(tok::kw_while)) &&
+         "'for' or 'while' expected");
+  nextToken();
+  parseParens();
+  if (FormatTok.Tok.is(tok::l_brace)) {
+    parseBlock();
+    addUnwrappedLine();
+  } else {
+    addUnwrappedLine();
+    ++Line.Level;
+    parseStatement();
+    --Line.Level;
+  }
+}
+
 void UnwrappedLineParser::parseDoWhile() {
   assert(FormatTok.Tok.is(tok::kw_do) && "'do' expected");
   nextToken();

clang/lib/Format/UnwrappedLineParser.h

@@ -92,6 +92,7 @@ private:
   void parseStatement();
   void parseParens();
   void parseIfThenElse();
+  void parseForOrWhileLoop();
   void parseDoWhile();
   void parseLabel();
   void parseCaseLabel();

clang/unittests/Format/FormatTest.cpp

@@ -81,11 +81,26 @@ TEST_F(FormatTest, FormatsNestedBlockStatements) {
 TEST_F(FormatTest, FormatsForLoop) {
   verifyFormat(
       "for (int VeryVeryLongLoopVariable = 0; VeryVeryLongLoopVariable < 10;\n"
-      "     ++VeryVeryLongLoopVariable);");
+      "     ++VeryVeryLongLoopVariable)\n"
+      "  ;");
+  verifyFormat("for (;;)\n"
+               "  f();");
+  verifyFormat("for (;;) {\n"
+               "}");
+  verifyFormat("for (;;) {\n"
+               "  f();\n"
+               "}");
 }
 
 TEST_F(FormatTest, FormatsWhileLoop) {
   verifyFormat("while (true) {\n}");
+  verifyFormat("while (true)\n"
+               "  f();");
+  verifyFormat("while () {\n"
+               "}");
+  verifyFormat("while () {\n"
+               "  f();\n"
+               "}");
 }
 
 TEST_F(FormatTest, FormatsNestedCall) {