85 lines
1.6 KiB
Rust
85 lines
1.6 KiB
Rust
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/* The 'fmt' extension is modeled on the posix printf system.
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*
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* A posix conversion ostensibly looks like this:
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*
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* %[parameter][flags][width][.precision][length]type
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*
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* Given the different numeric type bestiary we have, we omit the 'length'
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* parameter and support slightly different conversions for 'type':
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*
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* %[parameter][flags][width][.precision]type
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*
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* we also only support translating-to-rust a tiny subset of the possible
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* combinations at the moment.
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*/
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use std;
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import std.option;
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tag signedness {
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signed;
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unsigned;
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}
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tag caseness {
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case_upper;
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case_lower;
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}
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tag ty {
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ty_bool;
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ty_str;
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ty_char;
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ty_int(signedness);
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ty_bits;
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ty_hex(caseness);
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// FIXME: More types
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}
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tag flag {
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flag_left_justify;
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flag_left_zero_pad;
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flag_left_space_pad;
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flag_plus_if_positive;
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flag_alternate;
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}
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tag count {
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count_is(int);
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count_is_param(int);
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count_is_next_param;
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count_implied;
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}
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// A formatted conversion from an expression to a string
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tag conv {
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conv_param(option.t[int]);
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conv_flags(vec[flag]);
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conv_width(count);
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conv_precision(count);
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conv_ty(ty);
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}
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// A fragment of the output sequence
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tag piece {
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piece_string(str);
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piece_conv(str);
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}
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fn expand_syntax_ext(vec[@ast.expr] args,
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option.t[@ast.expr] body) -> @ast.expr {
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fail;
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}
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//
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// Local Variables:
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// mode: rust
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// fill-column: 78;
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// indent-tabs-mode: nil
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// c-basic-offset: 4
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// buffer-file-coding-system: utf-8-unix
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// compile-command: "make -k -C ../.. 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
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// End:
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//
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