1 files changed, 268 insertions, 0 deletions
diff --git a/mingling_core/src/renderer/structural.rs b/mingling_core/src/renderer/structural.rs
new file mode 100644
index 0000000..16ce471
--- /dev/null
+++ b/mingling_core/src/renderer/structural.rs
@@ -0,0 +1,268 @@
+use crate::{
+    StructuralRendererSetting, RenderResult, renderer::structural::error::StructuralRendererSerializeError,
+};
+use serde::Serialize;
+
+pub mod error;
+pub mod structural_data;
+
+use structural_data::StructuralData;
+
+/// A structural renderer that supports multiple serialization formats.
+///
+/// The `StructuralRenderer` provides methods to serialize data into various formats
+/// including JSON, YAML, TOML, and RON, with support for both regular and
+/// pretty-printed variants. It is designed to work with types that implement
+/// the [`StructuralData`] trait (which implies `Serialize`).
+pub struct StructuralRenderer;
+
+impl StructuralRenderer {
+    /// Renders data in the specified format to the given `RenderResult`.
+    ///
+    /// # Errors
+    ///
+    /// Returns `Err(StructuralRendererSerializeError)` if serialization fails.
+    #[allow(unused_variables)]
+    pub fn render<T: StructuralData + Send>(
+        data: &T,
+        setting: &StructuralRendererSetting,
+        r: &mut RenderResult,
+    ) -> Result<(), StructuralRendererSerializeError> {
+        match setting {
+            StructuralRendererSetting::Disable => Ok(()),
+            #[cfg(feature = "json_serde_fmt")]
+            StructuralRendererSetting::Json => Self::render_to_json(data, r),
+            #[cfg(feature = "json_serde_fmt")]
+            StructuralRendererSetting::JsonPretty => Self::render_to_json_pretty(data, r),
+            #[cfg(feature = "yaml_serde_fmt")]
+            StructuralRendererSetting::Yaml => Self::render_to_yaml(data, r),
+            #[cfg(feature = "toml_serde_fmt")]
+            StructuralRendererSetting::Toml => Self::render_to_toml(data, r),
+            #[cfg(feature = "ron_serde_fmt")]
+            StructuralRendererSetting::Ron => Self::render_to_ron(data, r),
+            #[cfg(feature = "ron_serde_fmt")]
+            StructuralRendererSetting::RonPretty => Self::render_to_ron_pretty(data, r),
+        }
+    }
+
+    /// Serializes data to JSON format and writes it to the render result.
+    ///
+    /// # Errors
+    ///
+    /// Returns `Err(StructuralRendererSerializeError)` if serialization fails.
+    #[cfg(feature = "json_serde_fmt")]
+    fn render_to_json<T: Serialize + Send>(
+        data: &T,
+        r: &mut RenderResult,
+    ) -> Result<(), StructuralRendererSerializeError> {
+        let json_string = serde_json::to_string(data)
+            .map_err(|e| StructuralRendererSerializeError::new(e.to_string()))?;
+        r.print(&json_string);
+        Ok(())
+    }
+
+    /// Serializes data to pretty-printed JSON format and writes it to the render result.
+    ///
+    /// # Errors
+    ///
+    /// Returns `Err(StructuralRendererSerializeError)` if serialization fails.
+    #[cfg(feature = "json_serde_fmt")]
+    fn render_to_json_pretty<T: Serialize + Send>(
+        data: &T,
+        r: &mut RenderResult,
+    ) -> Result<(), StructuralRendererSerializeError> {
+        let json_string = serde_json::to_string_pretty(data)
+            .map_err(|e| StructuralRendererSerializeError::new(e.to_string()))?;
+        r.print(&json_string);
+        Ok(())
+    }
+
+    /// Serializes data to RON format and writes it to the render result.
+    ///
+    /// # Errors
+    ///
+    /// Returns `Err(StructuralRendererSerializeError)` if serialization fails.
+    #[cfg(feature = "ron_serde_fmt")]
+    fn render_to_ron<T: Serialize + Send>(
+        data: &T,
+        r: &mut RenderResult,
+    ) -> Result<(), StructuralRendererSerializeError> {
+        let ron_string = ron::ser::to_string(data)
+            .map_err(|e| StructuralRendererSerializeError::new(e.to_string()))?;
+        r.print(&ron_string);
+        Ok(())
+    }
+
+    /// Serializes data to pretty-printed RON format and writes it to the render result.
+    ///
+    /// # Errors
+    ///
+    /// Returns `Err(StructuralRendererSerializeError)` if serialization fails.
+    #[cfg(feature = "ron_serde_fmt")]
+    fn render_to_ron_pretty<T: Serialize + Send>(
+        data: &T,
+        r: &mut RenderResult,
+    ) -> Result<(), StructuralRendererSerializeError> {
+        let pretty_config = ron::ser::PrettyConfig::new()
+            .new_line("\n")
+            .indentor("  ");
+
+        let ron_string = ron::ser::to_string_pretty(data, pretty_config)
+            .map_err(|e| StructuralRendererSerializeError::new(e.to_string()))?;
+        r.print(&ron_string);
+        Ok(())
+    }
+
+    /// Serializes data to TOML format and writes it to the render result.
+    ///
+    /// # Errors
+    ///
+    /// Returns `Err(StructuralRendererSerializeError)` if serialization fails.
+    #[cfg(feature = "toml_serde_fmt")]
+    fn render_to_toml<T: Serialize + Send>(
+        data: &T,
+        r: &mut RenderResult,
+    ) -> Result<(), StructuralRendererSerializeError> {
+        let toml_string =
+            toml::to_string(data).map_err(|e| StructuralRendererSerializeError::new(e.to_string()))?;
+        r.print(&toml_string);
+        Ok(())
+    }
+
+    /// Serializes data to YAML format and writes it to the render result.
+    ///
+    /// # Errors
+    ///
+    /// Returns `Err(StructuralRendererSerializeError)` if serialization fails.
+    #[cfg(feature = "yaml_serde_fmt")]
+    fn render_to_yaml<T: Serialize + Send>(
+        data: &T,
+        r: &mut RenderResult,
+    ) -> Result<(), StructuralRendererSerializeError> {
+        let yaml_string = serde_yaml::to_string(data)
+            .map_err(|e| StructuralRendererSerializeError::new(e.to_string()))?;
+        r.print(&yaml_string);
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::RenderResult;
+    use serde::Serialize;
+
+    #[derive(Debug, Clone, PartialEq, Serialize)]
+    struct TestData {
+        name: String,
+        value: i32,
+    }
+
+    impl crate::__private::StructuralDataSealed for TestData {}
+    impl StructuralData for TestData {}
+
+    fn test_data() -> TestData {
+        TestData {
+            name: "hello".into(),
+            value: 42,
+        }
+    }
+
+    #[test]
+    fn test_render_disable_does_nothing() {
+        let mut r = RenderResult::default();
+        let result =
+            StructuralRenderer::render(&test_data(), &StructuralRendererSetting::Disable, &mut r);
+        assert!(result.is_ok());
+        assert!(r.is_empty());
+    }
+
+    #[cfg(feature = "json_serde_fmt")]
+    #[test]
+    fn test_render_to_json() {
+        let mut r = RenderResult::default();
+        let result =
+            StructuralRenderer::render(&test_data(), &StructuralRendererSetting::Json, &mut r);
+        assert!(result.is_ok());
+        assert!(!r.is_empty());
+        let output: String = r.into();
+        assert!(output.contains("\"name\""));
+        assert!(output.contains("\"hello\""));
+        assert!(output.contains("\"value\""));
+        assert!(output.contains("42"));
+    }
+
+    #[cfg(feature = "json_serde_fmt")]
+    #[test]
+    fn test_render_to_json_pretty() {
+        let mut r = RenderResult::default();
+        let result =
+            StructuralRenderer::render(&test_data(), &StructuralRendererSetting::JsonPretty, &mut r);
+        assert!(result.is_ok());
+        let output: String = r.into();
+        // Pretty JSON has newlines
+        assert!(output.contains('\n'));
+    }
+
+    #[cfg(feature = "yaml_serde_fmt")]
+    #[test]
+    fn test_render_to_yaml() {
+        let mut r = RenderResult::default();
+        let result =
+            StructuralRenderer::render(&test_data(), &StructuralRendererSetting::Yaml, &mut r);
+        assert!(result.is_ok());
+        assert!(!r.is_empty());
+    }
+
+    #[cfg(feature = "toml_serde_fmt")]
+    #[test]
+    fn test_render_to_toml() {
+        let mut r = RenderResult::default();
+        let result =
+            StructuralRenderer::render(&test_data(), &StructuralRendererSetting::Toml, &mut r);
+        assert!(result.is_ok());
+        assert!(!r.is_empty());
+    }
+
+    #[cfg(feature = "ron_serde_fmt")]
+    #[test]
+    fn test_render_to_ron() {
+        let mut r = RenderResult::default();
+        let result =
+            StructuralRenderer::render(&test_data(), &StructuralRendererSetting::Ron, &mut r);
+        assert!(result.is_ok());
+        assert!(!r.is_empty());
+    }
+
+    #[cfg(feature = "ron_serde_fmt")]
+    #[test]
+    fn test_render_to_ron_pretty() {
+        let mut r = RenderResult::default();
+        let result =
+            StructuralRenderer::render(&test_data(), &StructuralRendererSetting::RonPretty, &mut r);
+        assert!(result.is_ok());
+        let output: String = r.into();
+        assert!(output.contains('\n'));
+    }
+
+    #[test]
+    fn test_render_dispatches_correct_format() {
+        // Test that render dispatches to the right format handler
+        let mut r = RenderResult::default();
+
+        // Disable
+        let result =
+            StructuralRenderer::render(&test_data(), &StructuralRendererSetting::Disable, &mut r);
+        assert!(result.is_ok());
+        assert!(r.is_empty());
+    }
+
+    #[cfg(feature = "json_serde_fmt")]
+    #[test]
+    fn test_render_dispatches_json() {
+        let mut r = RenderResult::default();
+        let result = StructuralRenderer::render(&test_data(), &StructuralRendererSetting::Json, &mut r);
+        assert!(result.is_ok());
+        assert!(!r.is_empty());
+    }
+}