binary, hex, octal literal types

src/parser.rs

@@ -391,6 +391,57 @@ impl<'a> TokenIterator<'a> {
                                     }
                                 }
                             }
+                            'x' | 'X' => {
+                                result.push(nxt);
+                                self.char_stream.next();
+                                while let Some(&nxt_hex) = self.char_stream.peek() {
+                                    match nxt_hex {
+                                        '0'...'9' | 'a'...'f' | 'A'...'F' => {
+                                            result.push(nxt_hex);
+                                            self.char_stream.next();
+                                        }
+                                        _ => break,
+                                    }
+                                }
+                                let out: String = result.iter().cloned().skip(2).collect();
+                                if let Ok(val) = i64::from_str_radix(&out, 16) {
+                                    return Some(Token::IntConst(val));
+                                }
+                            }
+                            'o' | 'O' => {
+                                result.push(nxt);
+                                self.char_stream.next();
+                                while let Some(&nxt_oct) = self.char_stream.peek() {
+                                    match nxt_oct {
+                                        '0'...'8' => {
+                                            result.push(nxt_oct);
+                                            self.char_stream.next();
+                                        }
+                                        _ => break,
+                                    }
+                                }
+                                let out: String = result.iter().cloned().skip(2).collect();
+                                if let Ok(val) = i64::from_str_radix(&out, 8) {
+                                    return Some(Token::IntConst(val));
+                                }
+                            }
+                            'b' | 'B' => {
+                                result.push(nxt);
+                                self.char_stream.next();
+                                while let Some(&nxt_bin) = self.char_stream.peek() {
+                                    match nxt_bin {
+                                        '0' | '1' | '_' => {
+                                            result.push(nxt_bin);
+                                            self.char_stream.next();
+                                        }
+                                        _ => break,
+                                    }
+                                }
+                                let out: String = result.iter().cloned().skip(2).filter(|c| c != &'_').collect();
+                                if let Ok(val) = i64::from_str_radix(&out, 2) {
+                                    return Some(Token::IntConst(val));
+                                }
+                            }
                             _ => break,
                         }
                     }

src/tests.rs

@@ -688,4 +688,55 @@ fn test_right_shift_equals() {
     } else {
         assert!(false);
     }
+}
+
+#[test]
+fn test_hex_literal() {
+    let mut engine = Engine::new();
+
+    if let Ok(result) = engine.eval::<i64>("let x = 0xf; x") {
+        assert_eq!(result, 15);
+    } else {
+        assert!(false);
+    }
+
+    if let Ok(result) = engine.eval::<i64>("let x = 0xff; x") {
+        assert_eq!(result, 255);
+    } else {
+        assert!(false);
+    }
+}
+
+#[test]
+fn test_octal_literal() {
+    let mut engine = Engine::new();
+
+    if let Ok(result) = engine.eval::<i64>("let x = 0o77; x") {
+        assert_eq!(result, 63);
+    } else {
+        assert!(false);
+    }
+
+    if let Ok(result) = engine.eval::<i64>("let x = 0o1234; x") {
+        assert_eq!(result, 668);
+    } else {
+        assert!(false);
+    }
+}
+
+#[test]
+fn test_binary_literal() {
+    let mut engine = Engine::new();
+
+    if let Ok(result) = engine.eval::<i64>("let x = 0b1111; x") {
+        assert_eq!(result, 15);
+    } else {
+        assert!(false);
+    }
+
+    if let Ok(result) = engine.eval::<i64>("let x = 0b0011_1100_1010_0101; x") {
+        assert_eq!(result, 15525);
+    } else {
+        assert!(false);
+    }
 }