Add utilities for applying a handler to a schema

Author: langmm

include/rapidjson/document.h

@@ -5698,6 +5698,8 @@ class GenericValue {
       return GetIntSubTypeString();
     } else if (IsUint() || IsUint64()) {
       return GetUintSubTypeString();
+    } else if (IsString() && !IsYggdrasil()) {
+      return GetStringSubTypeString();
     } else {
       RAPIDJSON_ASSERT(IsYggdrasil());
       RAPIDJSON_ASSERT(schema_->HasMember(GetSubTypeString()));
@@ -7064,6 +7066,15 @@ class GenericDocument : public GenericValue<Encoding, Allocator> {
     @returns true if successful, false otherwise.
    */
   bool Normalize(const ValueType& schema, StringBuffer* error=NULL);
+  /*!
+    @brief Encode a Value as a schema.
+    @param[in] doc Value to encode the schema for.
+    @param[in] minimal If True, the schema will not fully describe the
+      document and only contain enough properties to validate the
+      general properties.
+    @returns true if successful, false otherwise.
+   */
+  bool EncodeSchema(const ValueType& doc, const bool minimal=false);
   // TODO: Version where schema not provided when setting from existing
   //   populated document.
   size_t CountVarArgs(ValueType& schema, bool set) const {

include/rapidjson/error/en.h

@@ -135,6 +135,8 @@ inline const RAPIDJSON_ERROR_CHARTYPE* GetValidateError_En(ValidateErrorCode val
 	// Generic error for debugging
         case kValidateErrorGeneric:                     return RAPIDJSON_ERROR_STRING("Generic error occurred: %message");
         case kIncompatibleSchemas:                      return RAPIDJSON_ERROR_STRING("Incompatible schema property '%property': %expected vs %actual.");
+        case kValidateErrorMissingSubschema:            return RAPIDJSON_ERROR_STRING("Subschema is missing from one of the two schemas.");
+        case kValidateErrorSubschemas:                  return RAPIDJSON_ERROR_STRING("Object has one or more invalid subschemas.");
 #endif // RAPIDJSON_YGGDRASIL
 
         case kValidateErrorReadOnly:                    return RAPIDJSON_ERROR_STRING("Property is read-only but has been provided when validation is for writing.");

include/rapidjson/error/error.h

@@ -214,6 +214,8 @@ enum ValidateErrorCode {
     kDeprecatedWarning,                        //!< Property is being deprecated.
     kValidateErrorGeneric,                     //!< Generic error occurred: %message.
     kIncompatibleSchemas,                      //!< Incompatible schema property `%property`: %expected vs %actual.
+    kValidateErrorMissingSubschema,            //!< Subschema is missing from one of the two schemas.
+    kValidateErrorSubschemas,                  //!< Object has one or more invalid subschemas.
 #endif // RAPIDJSON_YGGDRASIL
 
     kValidateErrorReadOnly,                    //!< Property is read-only but has been provided when validation is for writing