3 * Implementation of GiNaC's wildcard objects. */
6 * GiNaC Copyright (C) 1999-2003 Johannes Gutenberg University Mainz, Germany
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
32 GINAC_IMPLEMENT_REGISTERED_CLASS(wildcard, basic)
35 // default constructor
38 wildcard::wildcard() : inherited(TINFO_wildcard), label(0)
40 setflag(status_flags::evaluated | status_flags::expanded);
47 wildcard::wildcard(unsigned l) : inherited(TINFO_wildcard), label(l)
49 setflag(status_flags::evaluated | status_flags::expanded);
56 wildcard::wildcard(const archive_node &n, lst &sym_lst) : inherited(n, sym_lst)
58 n.find_unsigned("label", label);
59 setflag(status_flags::evaluated | status_flags::expanded);
62 void wildcard::archive(archive_node &n) const
64 inherited::archive(n);
65 n.add_unsigned("label", label);
68 DEFAULT_UNARCHIVE(wildcard)
71 // functions overriding virtual functions from base classes
74 int wildcard::compare_same_type(const basic & other) const
76 GINAC_ASSERT(is_a<wildcard>(other));
77 const wildcard &o = static_cast<const wildcard &>(other);
82 return label < o.label ? -1 : 1;
85 void wildcard::print(const print_context & c, unsigned level) const
87 if (is_a<print_tree>(c)) {
88 c.s << std::string(level, ' ') << class_name() << " (" << label << ")"
89 << std::hex << ", hash=0x" << hashvalue << ", flags=0x" << flags << std::dec
91 } else if (is_a<print_python_repr>(c)) {
92 c.s << class_name() << '(' << label << ')';
97 unsigned wildcard::calchash() const
99 // this is where the schoolbook method
100 // (golden_ratio_hash(tinfo()) ^ label)
101 // is not good enough yet...
102 hashvalue = golden_ratio_hash(golden_ratio_hash(tinfo()) ^ label);
103 setflag(status_flags::hash_calculated);
107 bool wildcard::match(const ex & pattern, lst & repl_lst) const
109 // Wildcards must match each other exactly (this is required for
110 // subs() to work properly because in the final step it substitutes
111 // all wildcards by their matching expressions)
112 return is_equal(ex_to<basic>(pattern));