Add YAML file builder and automatically resolve offsets in tests

src/builder/yaml_file_builder.rs

@@ -0,0 +1,48 @@
+use super::FileBuilder;
+
+use std::io::{Result, Write};
+
+/// A structure representing a builder for Yaml files.
+/// The builder implements the `FileBuilder` trait.
+#[derive(Clone, Debug, Default, PartialEq)]
+pub struct YamlFileBuilder;
+
+impl FileBuilder for YamlFileBuilder {
+    fn extension(&mut self) -> &str {
+        "yaml"
+    }
+
+    fn write_top_level(&mut self, output: &mut dyn Write) -> Result<()> {
+        write!(output, "---\n")
+    }
+
+    fn write_namespace(
+        &mut self,
+        output: &mut dyn Write,
+        name: &str,
+        comment: Option<&str>,
+    ) -> Result<()> {
+        let comment = comment.map_or(String::new(), |c| format!(" # {}", c));
+
+        write!(output, "{}:{}\n", name, comment)
+    }
+
+    fn write_variable(
+        &mut self,
+        output: &mut dyn Write,
+        name: &str,
+        value: usize,
+        comment: Option<&str>,
+        indentation: Option<usize>,
+    ) -> Result<()> {
+        let indentation = " ".repeat(indentation.unwrap_or(4));
+
+        let comment = comment.map_or(String::new(), |c| format!(" # {}", c));
+
+        write!(output, "{}{}: {}{}\n", indentation, name, value, comment)
+    }
+
+    fn write_closure(&mut self, _output: &mut dyn Write, _eof: bool) -> Result<()> {
+        Ok(())
+    }
+}