WIP memory backend

Author: humanbeeng

src/main.rs

@@ -1,5 +1,6 @@
 mod ast;
 mod lexer;
+mod mem_backend;
 mod parser;
 use parser::parse;
 

src/mem_backend.rs

@@ -0,0 +1,37 @@
+pub enum ColumnType {
+    TextType,
+    IntType,
+}
+
+pub trait Backend {
+    fn create(&self) -> Result<(), ()>;
+    fn insert(&self) -> Result<(), ()>;
+    fn update(&self) -> Result<(), ()>;
+}
+
+trait Cell {
+    fn as_text(&self) -> String;
+    fn as_int(&self) -> u32;
+}
+
+pub struct Column {
+    col_type: ColumnType,
+    col_name: String,
+}
+
+type MemCell = Vec<u8>;
+
+impl Cell for MemCell {
+    fn as_int(&self) -> u32 {
+        return 1;
+    }
+
+    fn as_text(&self) -> String {
+        return String::new();
+    }
+}
+
+pub struct Results {
+    pub columns: Vec<Column>,
+    pub rows: Vec<Vec<MemCell>>,
+}