Copy the value of latex fragments through the pipeline.

src/context/comment.rs

@@ -6,18 +6,11 @@ use crate::config::Config;
 use crate::error::CustomError;
 use crate::intermediate::IComment;
 
+use super::macros::rnoop;
+
 #[derive(Debug, Serialize)]
 #[serde(tag = "type")]
 #[serde(rename = "comment")]
 pub(crate) struct RenderComment {}
 
-impl RenderComment {
-    pub(crate) fn new(
-        _config: &Config,
-        _output_directory: &Path,
-        _output_file: &Path,
-        _comment: &IComment,
-    ) -> Result<RenderComment, CustomError> {
-        Ok(RenderComment {})
-    }
-}
+rnoop!(RenderComment, IComment);

src/context/latex_fragment.rs

@@ -6,18 +6,25 @@ use crate::config::Config;
 use crate::error::CustomError;
 use crate::intermediate::ILatexFragment;
 
+use super::macros::render;
+
 #[derive(Debug, Serialize)]
 #[serde(tag = "type")]
 #[serde(rename = "latex_fragment")]
-pub(crate) struct RenderLatexFragment {}
-
-impl RenderLatexFragment {
-    pub(crate) fn new(
-        _config: &Config,
-        _output_directory: &Path,
-        _output_file: &Path,
-        _comment: &ILatexFragment,
-    ) -> Result<RenderLatexFragment, CustomError> {
-        Ok(RenderLatexFragment {})
-    }
+pub(crate) struct RenderLatexFragment {
+    value: String,
 }
+
+render!(
+    RenderLatexFragment,
+    ILatexFragment,
+    original,
+    _config,
+    _output_directory,
+    _output_file,
+    {
+        Ok(RenderLatexFragment {
+            value: original.value.clone(),
+        })
+    }
+);

src/context/macros.rs

@@ -0,0 +1,43 @@
+/// Write the implementation for the render ast node.
+///
+/// This exists to make changing the type signature easier.
+macro_rules! render {
+    ($rstruct:ident, $istruct:ident, $original:ident, $config:ident, $output_directory:ident, $output_file:ident, $fnbody:tt) => {
+        impl $rstruct {
+            pub(crate) fn new(
+                config: &Config,
+                output_directory: &Path,
+                output_file: &Path,
+                original: &$istruct,
+            ) -> Result<$rstruct, CustomError> {
+                let $original = original;
+                let $config = config;
+                let $output_directory = output_directory;
+                let $output_file = output_file;
+                $fnbody
+            }
+        }
+    };
+}
+
+pub(crate) use render;
+
+/// Write the implementation for a render ast node that has no fields.
+///
+/// This exists to make changing the type signature easier.
+macro_rules! rnoop {
+    ($rstruct:ident, $istruct:ident) => {
+        impl $rstruct {
+            pub(crate) fn new(
+                _config: &Config,
+                _output_directory: &Path,
+                _output_file: &Path,
+                _original: &$istruct,
+            ) -> Result<$rstruct, CustomError> {
+                Ok($rstruct {})
+            }
+        }
+    };
+}
+
+pub(crate) use rnoop;

src/context/mod.rs

@@ -32,6 +32,7 @@ mod keyword;
 mod latex_environment;
 mod latex_fragment;
 mod line_break;
+mod macros;
 mod object;
 mod org_macro;
 mod paragraph;