diff --git a/lexer/src/states/mod.rs b/lexer/src/states/mod.rs
index f661fd0..a9c45a0 100644
--- a/lexer/src/states/mod.rs
+++ b/lexer/src/states/mod.rs
@@ -7,9 +7,11 @@ use token::Token;
 
 mod begin;
 mod hash;
+mod number;
 mod id;
 
 pub use self::begin::Begin;
+pub use self::number::BeginNumber;
 
 #[derive(Debug)]
 pub enum StateResult {
diff --git a/lexer/src/states/number.rs b/lexer/src/states/number.rs
new file mode 100644
index 0000000..2bf4c35
--- /dev/null
+++ b/lexer/src/states/number.rs
@@ -0,0 +1,45 @@
+/* lexer/src/states/number.rs
+ * Eryn Wells <eryn@erynwells.me>
+ */
+
+use super::{State, StateResult, Token};
+
+#[derive(Debug, Eq, PartialEq)]
+pub enum Base {
+    Bin = 2,
+    Oct = 8,
+    Dec = 10,
+    Hex = 16
+}
+
+#[derive(Debug)]
+pub struct Builder {
+    base: Base
+}
+
+#[derive(Debug)]
+pub struct BeginNumber(Builder);
+
+impl Builder {
+    pub fn new() -> Builder {
+        Builder { base: Base::Dec }
+    }
+}
+
+impl BeginNumber {
+    pub fn new() -> BeginNumber {
+        BeginNumber(Builder::new())
+    }
+}
+
+impl State for BeginNumber {
+    fn lex(&mut self, c: char) -> StateResult {
+        // TODO: Implement.
+        StateResult::fail("blah")
+    }
+
+    fn none(&mut self) -> Result<Option<Token>, String> {
+        // TODO: Implement.
+        Err("blah".to_string())
+    }
+}
\ No newline at end of file