Hide noexcept condition

include/cppast/code_generator.hpp

@@ -159,7 +159,8 @@ namespace cppast
             exclude,        //< Exclude the entire entity.
             exclude_return, //< Exclude the return type of a function entity.
             exclude_target, //< Exclude the underlying entity of an alias (e.g. typedef).
-            declaration,    //< Only write declaration.
+            exclude_noexcept_condition, //< Exclude the condition of a noexcept.`
+            declaration,                //< Only write declaration.
             /// For a macro, it won't show the replacement if this flag is set
             _flag_set_size, //< \exclude
         };

src/code_generator.cpp

@@ -500,7 +500,14 @@ namespace
         else
         {
             output << keyword("noexcept") << punctuation("(") << bracket_ws;
-            detail::write_expression(output, cond);
+            // update check when expression gets exposed
+            if (cond.kind() == cpp_expression_kind::unexposed_t
+                && static_cast<const cpp_unexposed_expression&>(cond).expression() == "false")
+                output << keyword("false");
+            else if (output.options().is_set(code_generator::exclude_noexcept_condition))
+                output.excluded(base);
+            else
+                detail::write_expression(output, cond);
             output << bracket_ws << punctuation(")");
         }
     }

test/code_generator.cpp

@@ -162,7 +162,7 @@ struct foo{
                 else if (e.name() == "FOO")
                     // don't show macro replacement
                     return code_generator::declaration;
-                return {};
+                return code_generator::exclude_noexcept_condition;
             }
         };
 
@@ -174,7 +174,7 @@ void func(int a, int e, int c);
 #define FOO hidden
 
 template <typename e1, typename e2>
-void tfunc(int a);
+void tfunc(int a) noexcept(false);
 
 struct base {};
 struct e_t {};
@@ -198,13 +198,15 @@ public:
 private:
     int e3;
 };
+
+void func2() noexcept(0 == 1 && 42);
 )";
 
         auto synopsis = R"(void func(int a,int c);
 
 #define FOO
 
-void tfunc(int a);
+void tfunc(int a)noexcept(false);
 
 struct base{
 };
@@ -221,6 +223,8 @@ class foo{
 public:
   int c;
 };
+
+void func2()noexcept(excluded);
 )";
 
         auto file = parse({}, "code_generator_exclude.cpp", code);