Merge pull request #1441 from vsg-dev/json

Initial JSON parser and ReaderWriter.

Author: robertosfield

include/vsg/all.h

@@ -45,6 +45,7 @@ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLI
 #include <vsg/maths/clamp.h>
 #include <vsg/maths/color.h>
 #include <vsg/maths/common.h>
+#include <vsg/maths/mat2.h>
 #include <vsg/maths/mat3.h>
 #include <vsg/maths/mat4.h>
 #include <vsg/maths/plane.h>
@@ -250,6 +251,7 @@ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLI
 #include <vsg/vk/RenderPass.h>
 #include <vsg/vk/ResourceRequirements.h>
 #include <vsg/vk/Semaphore.h>
+#include <vsg/vk/Slots.h>
 #include <vsg/vk/State.h>
 #include <vsg/vk/SubmitCommands.h>
 #include <vsg/vk/Surface.h>
@@ -274,6 +276,7 @@ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLI
 #include <vsg/io/VSG.h>
 #include <vsg/io/convert_utf.h>
 #include <vsg/io/glsl.h>
+#include <vsg/io/json.h>
 #include <vsg/io/mem_stream.h>
 #include <vsg/io/read.h>
 #include <vsg/io/read_line.h>

include/vsg/io/json.h

@@ -0,0 +1,72 @@
+#pragma once
+
+/* <editor-fold desc="MIT License">
+
+Copyright(c) 2025 Robert Osfield
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shimages be included in images
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+</editor-fold> */
+
+#include <vsg/io/ReaderWriter.h>
+#include <vsg/io/mem_stream.h>
+
+namespace vsg
+{
+
+    /// JSON parser based on spec: https://www.json.org/json-en.html
+    struct JSONParser
+    {
+        std::string buffer;
+        std::size_t pos = 0;
+        vsg::mem_stream mstr;
+        vsg::indentation indent;
+
+        JSONParser();
+
+        inline bool white_space(char c) const
+        {
+            return (c == ' ' || c == '\t' || c == '\r' || c == '\n');
+        }
+
+        bool read_string(std::string& value);
+
+        vsg::ref_ptr<vsg::Object> read_array();
+        vsg::ref_ptr<vsg::Object> read_object();
+    };
+    VSG_type_name(vsg::JSONParser);
+
+    /// json ReaderWriter
+    class json : public vsg::Inherit<vsg::ReaderWriter, json>
+    {
+    public:
+        json();
+
+        vsg::ref_ptr<vsg::Object> read(const vsg::Path&, vsg::ref_ptr<const vsg::Options>) const override;
+        vsg::ref_ptr<vsg::Object> read(std::istream&, vsg::ref_ptr<const vsg::Options>) const override;
+        vsg::ref_ptr<vsg::Object> read(const uint8_t* ptr, size_t size, vsg::ref_ptr<const vsg::Options> options = {}) const override;
+
+        vsg::ref_ptr<vsg::Object> _read(std::istream&, vsg::ref_ptr<const vsg::Options>) const;
+
+        bool supportedExtension(const vsg::Path& ext) const;
+
+        bool getFeatures(Features& features) const override;
+    };
+    VSG_type_name(vsg::json);
+
+} // namespace vsg

src/vsg/CMakeLists.txt

@@ -141,9 +141,10 @@ set(SOURCES
     io/Path.cpp
     io/ReaderWriter.cpp
     io/VSG.cpp
+    io/glsl.cpp
+    io/json.cpp
     io/spirv.cpp
     io/tile.cpp
-    io/glsl.cpp
     io/txt.cpp
     io/read.cpp
     io/write.cpp