Add builtins to ast and parse them

src/builtin.rs

@@ -1,21 +1,31 @@
-// Possible future built-ins
-//
-// #get - Get table's value at a key/path
-// #set - Set table's value at a key/path
-// #raw - Interpret values literally (either recursively or only one layer)
-// #path - Construct a path from a table
-// #scope - Execute a command in a new sub-scope
-// #loop - Repeat a command infinitely
-// #break - Break out of an infinite loop (with a value?)
-// #if - Conditionally execute one of two commands
-// #print - Print a string to stdout
-// #input - Read a line from stdin
-// #read - Load the contents of a file as string
-// #write - Store a string into a file
-// Arithmetic: #add #sub #neg #shiftr #shiftl
-// Booleans: #and #or #not #xor #andb #orb #notb #xorb
-// Comparisons: #eq #neq #lt #le #gt #ge
+use std::fmt;
 
 /// Built-in operations
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub enum Builtin {}
+#[derive(Clone, Copy, PartialEq, Eq, Hash)]
+pub enum Builtin {
+    Get,
+    Set,
+    GetRaw,
+    SetRaw,
+    GetMeta,
+    SetMeta,
+    Scope,
+    Arg,
+    Destructure,
+}
+
+impl fmt::Debug for Builtin {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::Get => write!(f, "'get"),
+            Self::Set => write!(f, "'set"),
+            Self::GetRaw => write!(f, "'getraw"),
+            Self::SetRaw => write!(f, "'setraw"),
+            Self::GetMeta => write!(f, "'getmeta"),
+            Self::SetMeta => write!(f, "'setmeta"),
+            Self::Scope => write!(f, "'scope"),
+            Self::Arg => write!(f, "'arg"),
+            Self::Destructure => write!(f, "'destructure"),
+        }
+    }
+}