[PATCH] clang-format: Add basic support for try and catch statements

[Stefanus Du Toit]

Hi djasper,

This patch adds parsing of try and catch statements to LibFormat, respecting the break before brace style as appropriate.


http://llvm-reviews.chandlerc.com/D2731

Files:
  lib/Format/UnwrappedLineParser.cpp
  lib/Format/UnwrappedLineParser.h
  test/Format/try-catch.cpp

Index: lib/Format/UnwrappedLineParser.cpp
===================================================================
--- lib/Format/UnwrappedLineParser.cpp
+++ lib/Format/UnwrappedLineParser.cpp
@@ -643,6 +643,12 @@
   case tok::kw_case:
     parseCaseLabel();
     return;
+  case tok::kw_try:
+    parseTry();
+    return;
+  case tok::kw_catch:
+    parseCatch();
+    return;
   case tok::kw_extern:
     nextToken();
     if (FormatTok->Tok.is(tok::string_literal)) {
@@ -1073,6 +1079,48 @@
   parseStructuralElement();
 }
 
+void UnwrappedLineParser::parseTry() {
+  assert(FormatTok->Tok.is(tok::kw_try) && "'try' expected");
+  nextToken();
+
+  if (FormatTok->Tok.is(tok::l_brace)) {
+    CompoundStatementIndenter Indenter(this, Style, Line->Level);
+    parseBlock(/*MustBeDeclaration=*/false);
+
+    if (Style.BreakBeforeBraces == FormatStyle::BS_GNU)
+      addUnwrappedLine();
+  } else {
+    // FIXME: Add error handling.
+    addUnwrappedLine();
+    return;
+  }
+}
+
+void UnwrappedLineParser::parseCatch() {
+  assert(FormatTok->Tok.is(tok::kw_catch) && "'catch' expected");
+  nextToken();
+
+  if (FormatTok->Tok.is(tok::l_paren)) {
+    parseParens();
+  }
+
+  if (FormatTok->Tok.is(tok::l_brace)) {
+    CompoundStatementIndenter Indenter(this, Style, Line->Level);
+    parseBlock(/*MustBeDeclaration=*/false);
+
+    if (FormatTok->Tok.is(tok::kw_catch)) {
+      if (Style.BreakBeforeBraces == FormatStyle::BS_GNU)
+        addUnwrappedLine();
+    } else {
+      addUnwrappedLine();
+    }
+  } else {
+    // FIXME: Add error handling.
+    addUnwrappedLine();
+    return;
+  }
+}
+
 void UnwrappedLineParser::parseLabel() {
   nextToken();
   unsigned OldLineLevel = Line->Level;
Index: lib/Format/UnwrappedLineParser.h
===================================================================
--- lib/Format/UnwrappedLineParser.h
+++ lib/Format/UnwrappedLineParser.h
@@ -87,6 +87,8 @@
   void parseIfThenElse();
   void parseForOrWhileLoop();
   void parseDoWhile();
+  void parseTry();
+  void parseCatch();
   void parseLabel();
   void parseCaseLabel();
   void parseSwitch();
Index: test/Format/try-catch.cpp
===================================================================
--- test/Format/try-catch.cpp
+++ test/Format/try-catch.cpp
@@ -0,0 +1,26 @@
+// RUN: grep -Ev "// *[A-Z0-9-]+:" %s > %t.cpp
+// RUN: clang-format -style="{BasedOnStyle: Google, BreakBeforeBraces: Stroustrup}" %t.cpp | FileCheck %s -strict-whitespace -check-prefix=CHECK1
+// RUN: clang-format -style="{BasedOnStyle: Google, BreakBeforeBraces: GNU}" %t.cpp | FileCheck %s -strict-whitespace -check-prefix=CHECK2
+// CHECK1:      {{^\ \ try\ \{}}
+// CHECK1-NEXT: {{^\ \ \ \ g\(\);}}
+// CHECK1-NEXT: {{^\ \ \} catch \(int\) \{}}
+// CHECK1-NEXT: {{^\ \ \ \ g\(\);}}
+// CHECK1-NEXT: {{^\ \ \} catch \(\.\.\.\) \{}}
+// CHECK1-NEXT: {{^\ \ \ \ g\(\);}}
+// CHECK1-NEXT: {{^\ \ [}]}}
+// CHECK2:      {{^\ \ try}}
+// CHECK2-NEXT: {{^\ \ \ \ {}}
+// CHECK2-NEXT: {{^\ \ \ \ \ \ g\(\);}}
+// CHECK2-NEXT: {{^\ \ \ \ [}]}}
+// CHECK2-NEXT: {{^\ \ catch \(int\)}}
+// CHECK2-NEXT: {{^\ \ \ \ {}}
+// CHECK2-NEXT: {{^\ \ \ \ \ \ g\(\);}}
+// CHECK2-NEXT: {{^\ \ \ \ [}]}}
+// CHECK2-NEXT: {{^\ \ catch \(\.\.\.\)}}
+// CHECK2-NEXT: {{^\ \ \ \ {}}
+// CHECK2-NEXT: {{^\ \ \ \ \ \ g\(\);}}
+// CHECK2-NEXT: {{^\ \ \ \ [}]}}
+
+void g();
+
+void f() { try { g(); } catch (int) { g(); } catch (...) { g(); } }
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