Copy the value of latex fragments through the pipeline.

src/intermediate/latex_fragment.rs

@@ -1,5 +1,19 @@
-use super::macros::inoop;
+use super::macros::intermediate;
 
 use crate::error::CustomError;
 
-inoop!(ILatexFragment, LatexFragment);
+#[derive(Debug, Clone)]
+pub(crate) struct ILatexFragment {
+    pub(crate) value: String,
+}
+
+intermediate!(ILatexFragment, LatexFragment, original, _registry, {
+    let value: String = if original.value.starts_with("$$") && original.value.ends_with("$$") {
+        format!("\\[{}\\]", &original.value[2..(original.value.len() - 2)])
+    } else if original.value.starts_with("$") && original.value.ends_with("$") {
+        format!("\\({}\\)", &original.value[1..(original.value.len() - 1)])
+    } else {
+        original.value.to_owned()
+    };
+    Ok(ILatexFragment { value })
+});