1 files changed, 47 insertions, 0 deletions
diff --git a/src/lib/ExtFmt.rs b/src/lib/ExtFmt.rs
new file mode 100644
index 00000000..15f7ff83
--- /dev/null
+++ b/src/lib/ExtFmt.rs
@@ -0,0 +1,47 @@
+tag signedness {
+    signed;
+    unsigned;
+}
+
+tag caseness {
+    case_upper;
+    case_lower;
+}
+
+tag ty {
+    ty_bool;
+    ty_str;
+    ty_char;
+    ty_int(signedness);
+    ty_bits;
+    ty_hex(caseness);
+    // FIXME: More types
+}
+
+tag flag {
+    flag_left_justify;
+    flag_left_zero_pad;
+    flag_left_space_pad;
+    flag_plus_if_positive;
+    flag_alternate;
+}
+
+tag count {
+    count_is(int);
+    count_is_param(int);
+    count_is_next_param;
+    count_implied;
+}
+
+// A formatted conversion from an expression to a string
+type conv = rec(option.t[int] param,
+                vec[flag] flags,
+                count width,
+                count precision,
+                ty ty);
+
+// A fragment of the output sequence
+tag piece {
+    piece_string(str);
+    piece_conv(conv);
+}