fix issue#199; update README

CMakeLists.txt

@@ -104,10 +104,8 @@ endif()
 add_test(NAME test_some COMMAND test_some)
 add_test(NAME test_ut COMMAND test_ut)
 add_test(NAME test_json_files COMMAND test_json_files)
-if(CMAKE_CXX_STANDARD GREATER_EQUAL 20)
-    add_test(NAME test_xml COMMAND test_xml)
-    add_test(NAME test_yaml COMMAND test_yaml)
-    add_test(NAME test_nothrow COMMAND test_nothrow)
-    add_test(NAME test_util COMMAND test_util)
-    add_test(NAME test_xml_nothrow COMMAND test_xml_nothrow)
-endif()
+add_test(NAME test_xml COMMAND test_xml)
+add_test(NAME test_yaml COMMAND test_yaml)
+add_test(NAME test_nothrow COMMAND test_nothrow)
+add_test(NAME test_util COMMAND test_util)
+add_test(NAME test_xml_nothrow COMMAND test_xml_nothrow)

README.md

@@ -269,6 +269,57 @@ We can slove the problem1 easily with c++17:
   //now you can operate the file
 ```
 
+### how to handle the enum type as strings?
+
+By default, Iguana handle enum type as  number type during serialization and deserialization.
+To handle the enum type as strings during serialization and deserialization with Iguana, we need to define a  full specialization template in the "iguana" namespace. This template is a struct that contains an array with the underlying numbers corresponding to the enum type.
+For example, if we have the following enum type:
+
+```c++
+enum class Status { STOP = 10, START };
+```
+
+And we want to handle the enum type as strings when parsing JSON:
+
+```c++
+    std::string str = R"(
+{
+  "a": "START",
+  "b": "STOP",
+}
+  )";
+```
+
+To do this, we define the full specialization template in the "iguana" namespace:
+
+```c++
+namespace iguana {
+template <> struct enum_value<Status> {
+  constexpr static std::array<int, 2> value = {10, 11};
+};
+} // namespace iguana
+```
+
+Once this is done, we can continue writing the rest of the code as usual.
+
+```c++
+struct enum_t {
+    Status a;
+    Status b;
+};
+REFLECTION(enum_t, a, b);
+
+// deserialization
+enum_t e;
+iguana::from_json(e, str);
+// serialization
+enum_t e;
+e.a = Status::START;
+e.b = Status::STOP;
+std::string ss;
+iguana::to_json(e ss);
+```
+
 ### Full sources:
 
 

example/yaml_example.cpp

@@ -229,7 +229,7 @@ void library_example() {
 libraries:
   - name: 
       Central Library
-    location: "Main\tStreet"
+    location: "Main\tStreet" #this is a comment
     books:
       - title:
         categories: 

iguana/yaml_reader.hpp

@@ -123,7 +123,16 @@ IGUANA_INLINE void parse_value(U &value, It &&value_begin, It &&value_end) {
     ++start;
     --end;
     if (*end != '"')
-      IGUANA_UNLIKELY { throw std::runtime_error(R"(Expected ")"); }
+      IGUANA_UNLIKELY {
+        // TODO: improve
+        auto it = start;
+        while (*it != '"' && it != end) {
+          ++it;
+        }
+        if (it == end || (*(it + 1) != '#'))
+          IGUANA_UNLIKELY { throw std::runtime_error(R"(Expected ")"); }
+        end = it;
+      }
     if constexpr (string_v<T>) {
       parse_escape_str(value, start, end);
       return;

iguana/yaml_util.hpp

@@ -6,7 +6,7 @@ namespace iguana {
 // return true when it==end
 template <typename It>
 IGUANA_INLINE bool skip_space_till_end(It &&it, It &&end) {
-  while (it != end && *it == ' ')
+  while (it != end && *it < 33)
     ++it;
   return it == end;
 }
@@ -25,14 +25,15 @@ template <typename It> IGUANA_INLINE auto skip_till_newline(It &&it, It &&end) {
       }
     else if (*it == '#')
       IGUANA_UNLIKELY {
-        if (*(it - 1) == ' ')
-          IGUANA_UNLIKELY {
-            // it - 1 should be legal because this func is for parse value
-            while ((it != end) && *it != '\n') {
-              ++it;
-            }
-            return res;
+        if (*(it - 1) == ' ') {
+          // it - 1 should be legal because this func is for parse value
+          while ((it != end) && *it != '\n') {
+            ++it;
           }
+          return res;
+        } else {
+          ++it;
+        }
       }
     else
       IGUANA_LIKELY { ++it; }
@@ -100,7 +101,7 @@ IGUANA_INLINE size_t skip_space_and_lines(It &&it, It &&end, size_t minspaces) {
             it = start;
           }
         }
-    } else if (*it == ' ') {
+    } else if (*it == ' ' || *it == '\t') {
       ++it;
       ++res;
     } else if (*it == '#') {

test/test_yaml.cpp

@@ -667,7 +667,7 @@ TEST_CASE("test example libraries") {
 libraries:
   - name: 
       Central Library
-    location: "Main\tStreet"
+    location: "Main\tStreet"#this is a comment
     books:
       - title:
         categories: