Match regular expressions to string_view

Author: rollbear

ChangeLog

@@ -1,3 +1,5 @@
+	* Support matching regular expressions to std::string view
+
 	* Added adapter for QA Systems Cantata. Thank you Andreas Schätti
 
 v44 2023-04-10

include/trompeloeil.hpp

@@ -2555,28 +2555,50 @@ template <typename T>
       class string_helper // a vastly simplified string_view type of class
       {
       public:
+        template <
+          typename S,
+          typename = decltype(std::declval<const char*&>() = std::declval<S>().data()),
+          typename = decltype(std::declval<S>().length())
+            >
         string_helper(
-          std::string const& s)
+          const S& s)
         noexcept
-          : str(s.c_str())
+          : begin_(s.data())
+          , end_(begin_ + s.length())
         {}
 
         constexpr
         string_helper(
           char const* s)
         noexcept
-          : str(s)
-        {}
+          : begin_(s)
+          , end_(s ? begin_ + strlen(s) : nullptr)
+        {
+        }
 
-        char const*
-        c_str()
+        constexpr
+        explicit
+        operator bool() const
+        {
+          return begin_;
+        }
+        constexpr
+        char const *
+        begin()
+          const
+        {
+          return begin_;
+        }
+        constexpr
+        char const *
+        end()
           const
-          noexcept
         {
-          return str;
+          return end_;
         }
       private:
-        char const* str;
+        char const* begin_;
+        char const* end_;
       };
 
       regex_check(
@@ -2593,8 +2615,7 @@ template <typename T>
         T const&)
       const
       {
-          return str.c_str()
-                 && std::regex_search(str.c_str(), re, match_type);
+        return str && std::regex_search(str.begin(), str.end(), re, match_type);
       }
 
     private:

test/compiling_tests.hpp

@@ -401,6 +401,9 @@ class mock_str
   MAKE_MOCK1(str, void(std::string));
   MAKE_MOCK1(overload, void(char const*));
   MAKE_MOCK1(overload, void(std::string const&));
+#if defined(__cpp_lib_string_view)
+  MAKE_MOCK1(string_view, void(std::string_view));
+#endif
 };
 
 class C_ptr

test/compiling_tests_11.cpp

@@ -2918,6 +2918,50 @@ TEST_CASE_METHOD(
 
 // tests of parameter matching using typed matcher re
 
+#if TROMPELOEIL_TEST_REGEX_FAILURES &&  defined(__cpp_lib_string_view)
+TEST_CASE_METHOD(
+  Fixture,
+  "C++11: call to string_view function matching regex is not reported",
+  "[C++11][C++14][matching][matchers][re]")
+{
+  {
+    mock_str obj;
+    REQUIRE_CALL_V(obj, string_view(trompeloeil::re("mid")));
+    char str[] = "pre mid post";
+    obj.string_view(str);
+  }
+  REQUIRE(reports.empty());
+}
+#endif
+#if TROMPELOEIL_TEST_REGEX_FAILURES &&  defined(__cpp_lib_string_view)
+TEST_CASE_METHOD(
+    Fixture,
+    "C++11: call to string_view function with non-matching string to regex is reported",
+    "[C++11][C++14][matching][matchers][re]")
+{
+  mock_str obj;
+  REQUIRE_CALL_V(obj, string_view(trompeloeil::re("mid")));
+  try
+  {
+    char str[] = "abcde";
+    obj.string_view(str);
+    FAIL("did not throw");
+  }
+  catch (reported)
+  {
+    REQUIRE(reports.size() == 1U);
+    auto& msg = reports.front().msg;
+    INFO("msg=" << msg);
+    auto re = R":(No match for call of string_view with signature void\(std::string_view\) with.
+  param  _1 == abcde
+
+Tried obj.string_view\(trompeloeil::re\("mid"\)\) at [A-Za-z0-9_ ./:\]*:[0-9]*.*
+  Expected  _1 matching regular expression /mid/):";
+    REQUIRE(is_match(msg, re));
+  }
+}
+#endif
+
 #if TROMPELOEIL_TEST_REGEX_FAILURES
 
 TEST_CASE_METHOD(