3 * Implementation of GiNaC's wildcard objects. */
6 * GiNaC Copyright (C) 1999-2001 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 ctor, dtor, copy ctor, assignment operator and helpers
38 wildcard::wildcard() : label(0)
40 tinfo_key = TINFO_wildcard;
43 void wildcard::copy(const wildcard & other)
45 inherited::copy(other);
49 DEFAULT_DESTROY(wildcard)
55 wildcard::wildcard(unsigned l) : label(l)
57 tinfo_key = TINFO_wildcard;
64 wildcard::wildcard(const archive_node &n, const lst &sym_lst) : inherited(n, sym_lst)
66 n.find_unsigned("label", label);
69 void wildcard::archive(archive_node &n) const
71 inherited::archive(n);
72 n.add_unsigned("label", label);
75 DEFAULT_UNARCHIVE(wildcard)
78 // functions overriding virtual functions from base classes
81 int wildcard::compare_same_type(const basic & other) const
83 GINAC_ASSERT(is_a<wildcard>(other));
84 const wildcard &o = static_cast<const wildcard &>(other);
89 return label < o.label ? -1 : 1;
92 void wildcard::print(const print_context & c, unsigned level) const
94 if (is_a<print_tree>(c)) {
95 c.s << std::string(level, ' ') << class_name() << " (" << label << ")"
96 << std::hex << ", hash=0x" << hashvalue << ", flags=0x" << flags << std::dec
102 unsigned wildcard::calchash(void) const
104 // this is where the schoolbook method
105 // (golden_ratio_hash(tinfo()) ^ label)
106 // is not good enough yet...
107 hashvalue = golden_ratio_hash(golden_ratio_hash(tinfo()) ^ label);
108 setflag(status_flags::hash_calculated);
112 bool wildcard::match(const ex & pattern, lst & repl_lst) const
114 // Wildcards must match each other exactly (this is required for
115 // subs() to work properly because in the final step it substitutes
116 // all wildcards by their matching expressions)
117 return is_equal(ex_to<basic>(pattern));