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We're going to have a hard time if we want to pretty-print token trees.

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This commit is contained in:
Paul Stansifer 2012-07-11 10:42:25 -07:00
parent f3e874635f
commit c0abd6a2eb
1 changed files with 25 additions and 2 deletions
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27
src/libsyntax/print/pprust.rs
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@ -601,13 +601,29 @@ fn print_item(s: ps, &&item: @ast::item) {
for methods.each |meth| { print_ty_method(s, meth); }
bclose(s, item.span);
}
ast::item_mac(_m) {
fail "item macros unimplemented"
ast::item_mac({node: ast::mac_invoc_tt(pth, tts), _}) {
word(s.s, *item.ident);
bopen(s);
for tts.each |tt| { print_tt(s, tt); }
bclose(s, item.span);
}
ast::item_mac(_) {
fail "invalid item-position syntax bit"
}
}
s.ann.post(ann_node);
}
/// Unimplemented because ident tokens lose their meaning without the interner
/// present. Fixing that would make invoking the pretty printer painful.
/// If this did work, the naive way of implementing it would be really ugly.
/// A prettier option would involve scraping the macro grammar for formatting
/// advice. But that would be hard.
fn print_tt(_s: ps, _tt: ast::token_tree) {
fail "token trees cannot be pretty-printed"
}
fn print_variant(s: ps, v: ast::variant) {
word(s.s, *v.node.name);
if vec::len(v.node.args) > 0u {
@ -822,6 +838,13 @@ fn print_mac(s: ps, m: ast::mac) {
option::iter(arg, |a| print_expr(s, a));
// FIXME: extension 'body' (#2339)
}
ast::mac_invoc_tt(path, tts) {
print_path(s, path, false);
word(s.s, "!");
bopen(s);
for tts.each() |tt| { print_tt(s, tt); }
bclose(s, m.span);
}
ast::mac_embed_type(ty) {
word(s.s, "#<");
print_type(s, ty);