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| author |  Adam Chlipala <adam@chlipala.net> | 2012-04-21 15:09:02 -0400 |
|---|---|---|
| committer | Adam Chlipala <adam@chlipala.net> | 2012-04-21 15:09:02 -0400 |
| commit | 3b4612facbbf08e12ff983f315d654eb647f7afe (patch) | |
| tree | 284e45d1278dd22ad46b658933da8e24019a8ffc /src/elab_print.sml | |
| parent | d1898695cba6c924456d7de4d1b700072310f752 (diff) | |
Pretty-print tuple types using tuple syntax
Diffstat (limited to 'src/elab_print.sml')
| -rw-r--r-- | src/elab_print.sml | 36 |
1 files changed, 28 insertions, 8 deletions
diff --git a/src/elab_print.sml b/src/elab_print.sml index 46ad9285..69607056 100644 --- a/src/elab_print.sml +++ b/src/elab_print.sml @@ -112,14 +112,34 @@ fun p_con' par env (c, _) = string "=>", space, p_con env c3]) - | TRecord (CRecord (_, xcs), _) => box [string "{", - p_list (fn (x, c) => - box [p_name env x, - space, - string ":", - space, - p_con env c]) xcs, - string "}"] + | TRecord (CRecord (_, xcs), _) => + let + fun isTuple (n, xcs) = + case xcs of + [] => n > 2 + | ((CName s, _), _) :: xcs' => + s = Int.toString n andalso isTuple (n+1, xcs') + | _ => false + in + if isTuple (1, xcs) then + case xcs of + (_, c) :: xcs => + parenIf par (box [p_con' true env c, + p_list_sep (box []) (fn (_, c) => box [space, + string "*", + space, + p_con' true env c]) xcs]) + | _ => raise Fail "ElabPrint: surprise empty tuple" + else + box [string "{", + p_list (fn (x, c) => + box [p_name env x, + space, + string ":", + space, + p_con env c]) xcs, + string "}"] + end | TRecord c => box [string "$", p_con' true env c] |