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Add GetOpts module to std
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Marijn Haverbeke
parent
d0ed2e384a
commit
74c7457131
249
src/lib/GetOpts.rs
Normal file
249
src/lib/GetOpts.rs
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/* Simple getopt alternative. Construct a vector of options, either by using
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* reqopt, optopt, and optflag or by building them from components yourself,
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* and pass them to getopts, along with a vector of actual arguments (not
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* including argv[0]). You'll either get a failure code back, or a match.
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* You'll have to verify whether the amount of 'free' arguments in the match
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* is what you expect. Use opt_* accessors (bottom of the file) to get
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* argument values out of the match object.
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*/
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import option.some;
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import option.none;
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tag name { long(str); short(char); }
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tag hasarg { yes; no; maybe; }
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tag occur { req; optional; multi; }
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type opt = rec(name name, hasarg hasarg, occur occur);
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fn mkname(str nm) -> name {
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if (_str.char_len(nm) == 1u) { ret short(_str.char_at(nm, 0u)); }
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else { ret long(nm); }
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}
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fn reqopt(str name) -> opt {
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ret rec(name=mkname(name), hasarg=yes, occur=req);
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}
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fn optopt(str name) -> opt {
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ret rec(name=mkname(name), hasarg=yes, occur=optional);
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}
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fn optflag(str name) -> opt {
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ret rec(name=mkname(name), hasarg=no, occur=optional);
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}
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fn optmulti(str name) -> opt {
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ret rec(name=mkname(name), hasarg=yes, occur=multi);
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}
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tag optval {
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val(str);
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given;
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}
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type match = rec(vec[opt] opts, vec[mutable vec[optval]] vals, vec[str] free);
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fn is_arg(str arg) -> bool {
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ret _str.byte_len(arg) > 1u && arg.(0) == '-' as u8;
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}
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fn name_str(name nm) -> str {
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alt (nm) {
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case (short(?ch)) {ret _str.from_char(ch);}
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case (long(?s)) {ret s;}
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}
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}
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// FIXME rustboot workaround
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fn name_eq(name a, name b) -> bool {
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alt (a) {
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case (long(?a)) {
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alt (b) {
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case (long(?b)) { ret _str.eq(a, b); }
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case (_) { ret false; }
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}
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}
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case (_) { if (a == b) { ret true; } else {ret false; } }
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}
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}
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fn find_opt(vec[opt] opts, name nm) -> option.t[uint] {
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auto i = 0u;
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auto l = _vec.len[opt](opts);
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while (i < l) {
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if (name_eq(opts.(i).name, nm)) { ret some[uint](i); }
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i += 1u;
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}
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ret none[uint];
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}
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tag fail_ {
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argument_missing(str);
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unrecognized_option(str);
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option_missing(str);
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option_duplicated(str);
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}
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fn fail_str(fail_ f) -> str {
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alt (f) {
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case (argument_missing(?nm)) {
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ret "Argument to option '" + nm + "' missing.";
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}
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case (unrecognized_option(?nm)) {
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ret "Unrecognized option: '" + nm + "'.";
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}
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case (option_missing(?nm)) {
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ret "Required option '" + nm + "' missing.";
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}
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case (option_duplicated(?nm)) {
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ret "Option '" + nm + "' given more than once.";
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}
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}
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}
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tag result {
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success(match);
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failure(fail_);
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}
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fn getopts(vec[str] args, vec[opt] opts) -> result {
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auto n_opts = _vec.len[opt](opts);
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fn empty_(uint x) -> vec[optval]{ret _vec.empty[optval]();}
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auto f = empty_;
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auto vals = _vec.init_fn_mut[vec[optval]](f, n_opts);
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let vec[str] free = vec();
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auto l = _vec.len[str](args);
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auto i = 0u;
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while (i < l) {
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auto cur = args.(i);
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auto curlen = _str.byte_len(cur);
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if (!is_arg(cur)) {
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_vec.push[str](free, cur);
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} else if (_str.eq(cur, "--")) {
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free += _vec.slice[str](args, i + 1u, l);
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break;
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} else {
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auto names;
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auto i_arg = option.none[str];
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if (cur.(1) == '-' as u8) {
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auto tail = _str.slice(cur, 2u, curlen);
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auto eq = _str.index(tail, '=' as u8);
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if (eq == -1) {
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names = vec(long(tail));
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} else {
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names = vec(long(_str.slice(tail, 0u, eq as uint)));
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i_arg = option.some[str]
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(_str.slice(tail, (eq as uint) + 1u, curlen - 2u));
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}
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} else {
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auto j = 1u;
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names = vec();
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while (j < curlen) {
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auto range = _str.char_range_at(cur, j);
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_vec.push[name](names, short(range._0));
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j = range._1;
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}
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}
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auto name_pos = 0u;
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for (name nm in names) {
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name_pos += 1u;
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auto optid;
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alt (find_opt(opts, nm)) {
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case (some[uint](?id)) {optid = id;}
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case (none[uint]) {
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ret failure(unrecognized_option(name_str(nm)));
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}
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}
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alt (opts.(optid).hasarg) {
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case (no) {
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_vec.push[optval](vals.(optid), given);
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}
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case (maybe) {
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if (!option.is_none[str](i_arg)) {
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_vec.push[optval](vals.(optid),
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val(option.get[str](i_arg)));
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} else if (name_pos < _vec.len[name](names) ||
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i + 1u == l || is_arg(args.(i + 1u))) {
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_vec.push[optval](vals.(optid), given);
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} else {
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i += 1u;
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_vec.push[optval](vals.(optid), val(args.(i)));
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}
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}
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case (yes) {
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if (!option.is_none[str](i_arg)) {
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_vec.push[optval](vals.(optid),
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val(option.get[str](i_arg)));
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} else if (i + 1u == l) {
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ret failure(argument_missing(name_str(nm)));
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} else {
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i += 1u;
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_vec.push[optval](vals.(optid), val(args.(i)));
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}
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}
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}
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}
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}
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i += 1u;
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}
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i = 0u;
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while (i < n_opts) {
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auto n = _vec.len[optval](vals.(i));
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auto occ = opts.(i).occur;
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if (occ == req) {if (n == 0u) {
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ret failure(option_missing(name_str(opts.(i).name)));
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}}
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if (occ != multi) {if (n > 1u) {
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ret failure(option_duplicated(name_str(opts.(i).name)));
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}}
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i += 1u;
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}
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ret success(rec(opts=opts, vals=vals, free=free));
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}
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fn opt_vals(match m, str nm) -> vec[optval] {
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alt (find_opt(m.opts, mkname(nm))) {
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case (some[uint](?id)) { ret m.vals.(id); }
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case (none[uint]) {
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log_err "No option '" + nm + "' defined.";
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fail;
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}
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}
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}
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fn opt_val(match m, str nm) -> optval {
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ret opt_vals(m, nm).(0);
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}
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fn opt_present(match m, str nm) -> bool {
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ret _vec.len[optval](opt_vals(m, nm)) > 0u;
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}
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fn opt_str(match m, str nm) -> str {
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alt (opt_val(m, nm)) {
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case (val(?s)) { ret s; }
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case (_) { fail; }
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}
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}
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fn opt_strs(match m, str nm) -> vec[str] {
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let vec[str] acc = vec();
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for (optval v in opt_vals(m, nm)) {
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alt (v) {
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case (val(?s)) { _vec.push[str](acc, s); }
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case (_) {}
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}
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}
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ret acc;
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}
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fn opt_maybe_str(match m, str nm) -> option.t[str] {
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auto vals = opt_vals(m, nm);
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if (_vec.len[optval](vals) == 0u) { ret none[str]; }
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alt (vals.(0)) {
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case (val(?s)) { ret some[str](s); }
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case (_) { ret none[str]; }
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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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@ -70,6 +70,7 @@ mod ebml;
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mod UFind;
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mod ExtFmt;
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mod Box;
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mod GetOpts;
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// Local Variables:
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// mode: rust;
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