feat(xatu): add lint architecture

src/xatu/ast.rs

@@ -0,0 +1,36 @@
+use crate::FileId;
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct Inherit {
+    pub attr_count: usize,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum NodeData {
+    Inherit(Inherit),
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct SourceRange {
+    pub start: usize,
+    pub end: usize,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct Node {
+    pub range: SourceRange,
+    pub data: NodeData,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct ParseError {
+    pub range: SourceRange,
+    pub message: String,
+}
+
+#[derive(Debug)]
+pub struct ParsedFile {
+    pub file_id: FileId,
+    pub nodes: Vec<Node>,
+    pub errors: Vec<ParseError>,
+}