actually codegen the provided code

... well, since all we can do is to add integer literals, we produce
code for the calculations and then perform the exit syscall with the
result

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 {