1 files changed, 9 insertions, 0 deletions
diff --git a/src/parse.zig b/src/parse.zig
index 2149cd7..e0c1fd0 100644
--- a/src/parse.zig
+++ b/src/parse.zig
@@ -26,6 +26,15 @@ pub const Expr = struct {
             };
         };
     };
+
+    pub fn getInt(self: *const @This(), file_source: []const u8) u64 {
+        var value: u64 = 0;
+        for (file_source[self.loc.start..self.loc.end]) |c| {
+            std.debug.assert('0' <= c and c <= '9');
+            value = value * 10 + c - '0';
+        }
+        return value;
+    }
 };
 
 pub fn expression(allocator: Allocator, lexer: *Peekable(Lexer)) error{OutOfMemory}!*Expr {