Developing groupped terms feature.

CMakeLists.txt

@@ -58,6 +58,7 @@ if (CTPG_ENABLE_TESTS)
         tests/buffers.cpp
         tests/contexts.cpp
         tests/custom_lexer.cpp
+        tests/groupped_terms.cpp
     )
 
     target_link_libraries(testbin PRIVATE Catch2::Catch2 ctpg::ctpg)

examples/custom-lexer.cpp

@@ -20,7 +20,7 @@ class int_lexer
         ErrorStream& error_stream)
     {
         if (start == end)
-            return recognized_term{};
+            return unrecognized_term;
         if (*start >= '0' && *start <= '9')     // recognize only single digit numbers
         {
             // idx == 1, recognized 'number' term
@@ -31,7 +31,7 @@ class int_lexer
             // idx == 0, recognized 'comma' term
             return recognized(0, options, start, sp, error_stream);
         }
-        return recognized_term{};
+        return unrecognized_term;
     }
 
 private:
@@ -43,11 +43,13 @@ class int_lexer
         source_point sp,
         ErrorStream& error_stream)
     {
+        // respect the verbose option, print conditionally any debug message, with the source point
         if (options.verbose)
             error_stream << sp << " LEXER MATCH: Recognized " << idx << " \n";
 
-        // all terms have length == 1
+        // update source point to refer the exact character
         sp.update(start, start + 1);
+        // all terms have length == 1
         return recognized_term(idx, 1);
     }
 };

examples/regex-test.cpp

@@ -5,8 +5,8 @@
 
 using namespace ctpg;
 
-constexpr char pattern[] = R"([0-9a-zA-Z_]+)";
-constexpr regex::expr<pattern> r;
+constexpr char p[] = R"([0-9a-zA-Z_]+)";
+constexpr regex::expr<p> r;
 
 int main(int argc, char* argv[])
 {