Rewrote project in Rust

src/builder/json_file_builder.rs

@@ -0,0 +1,56 @@
+use std::io::{Result, Write};
+
+use serde_json::{json, Value};
+
+use super::FileBuilder;
+
+#[derive(Default)]
+pub struct JsonFileBuilder {
+    json: Value,
+    namespace: String,
+}
+
+impl FileBuilder for JsonFileBuilder {
+    fn extension(&mut self) -> &str {
+        "json"
+    }
+
+    fn write_top_level(&mut self, _output: &mut dyn Write) -> Result<()> {
+        Ok(())
+    }
+
+    fn write_namespace(&mut self, _output: &mut dyn Write, name: &str) -> Result<()> {
+        self.namespace = name.to_string();
+
+        Ok(())
+    }
+
+    fn write_variable(&mut self, _output: &mut dyn Write, name: &str, value: usize) -> Result<()> {
+        if let Some(json_as_map) = self.json.as_object_mut() {
+            let namespace_entry = json_as_map
+                .entry(self.namespace.clone())
+                .or_insert_with(|| json!({}));
+
+            if let Some(namespace_object) = namespace_entry.as_object_mut() {
+                namespace_object.insert(name.to_string(), json!(value));
+            }
+        }
+
+        Ok(())
+    }
+
+    fn write_closure(&mut self, output: &mut dyn Write, eof: bool) -> Result<()> {
+        if eof {
+            write!(
+                output,
+                "{}",
+                serde_json::to_string_pretty(&self.json).unwrap()
+            )
+            .unwrap();
+
+            self.json = json!({});
+        }
+
+        Ok(())
+    }
+}