1 /* regexp-fields.cc - field processor glue for regex supporting fields
3 * This file is part of notmuch.
5 * Copyright © 2015 Austin Clements
6 * Copyright © 2016 David Bremner
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 3 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, see https://www.gnu.org/licenses/ .
21 * Author: Austin Clements <aclements@csail.mit.edu>
22 * David Bremner <david@tethera.net>
25 #include "regexp-fields.h"
26 #include "notmuch-private.h"
27 #include "database-private.h"
30 compile_regex (regex_t ®exp, const char *str)
32 int err = regcomp (®exp, str, REG_EXTENDED | REG_NOSUB);
35 size_t len = regerror (err, ®exp, NULL, 0);
36 char *buffer = new char[len];
37 std::string msg = "Regexp error: ";
38 (void) regerror (err, ®exp, buffer, len);
39 msg.append (buffer, len);
42 throw Xapian::QueryParserError (msg);
46 RegexpPostingSource::RegexpPostingSource (Xapian::valueno slot, const std::string ®exp)
49 compile_regex (regexp_, regexp.c_str ());
52 RegexpPostingSource::~RegexpPostingSource ()
58 RegexpPostingSource::init (const Xapian::Database &db)
61 it_ = db_.valuestream_begin (slot_);
62 end_ = db.valuestream_end (slot_);
67 RegexpPostingSource::get_termfreq_min () const
73 RegexpPostingSource::get_termfreq_est () const
75 return get_termfreq_max () / 2;
79 RegexpPostingSource::get_termfreq_max () const
81 return db_.get_value_freq (slot_);
85 RegexpPostingSource::get_docid () const
87 return it_.get_docid ();
91 RegexpPostingSource::at_end () const
97 RegexpPostingSource::next (unused (double min_wt))
99 if (started_ && ! at_end ())
103 for (; ! at_end (); ++it_) {
104 std::string value = *it_;
105 if (regexec (®exp_, value.c_str (), 0, NULL, 0) == 0)
111 RegexpPostingSource::skip_to (Xapian::docid did, unused (double min_wt))
115 for (; ! at_end (); ++it_) {
116 std::string value = *it_;
117 if (regexec (®exp_, value.c_str (), 0, NULL, 0) == 0)
123 RegexpPostingSource::check (Xapian::docid did, unused (double min_wt))
126 if (! it_.check (did) || at_end ())
128 return (regexec (®exp_, (*it_).c_str (), 0, NULL, 0) == 0);
131 static inline Xapian::valueno
132 _find_slot (std::string prefix)
134 if (prefix == "from")
135 return NOTMUCH_VALUE_FROM;
136 else if (prefix == "subject")
137 return NOTMUCH_VALUE_SUBJECT;
138 else if (prefix == "mid")
139 return NOTMUCH_VALUE_MESSAGE_ID;
141 return Xapian::BAD_VALUENO;
144 RegexpFieldProcessor::RegexpFieldProcessor (std::string prefix,
145 notmuch_field_flag_t options_,
146 Xapian::QueryParser &parser_,
147 notmuch_database_t *notmuch_)
148 : slot (_find_slot (prefix)),
149 term_prefix (_find_prefix (prefix.c_str ())),
157 RegexpFieldProcessor::operator() (const std::string & str)
160 if (options & NOTMUCH_FIELD_PROBABILISTIC) {
161 return Xapian::Query (Xapian::Query::OP_AND_NOT,
162 Xapian::Query::MatchAll,
163 Xapian::Query (Xapian::Query::OP_WILDCARD, term_prefix));
165 return Xapian::Query (term_prefix);
169 if (str.at (0) == '/') {
170 if (str.length () > 1 && str.at (str.size () - 1) == '/') {
171 std::string regexp_str = str.substr (1, str.size () - 2);
172 if (slot != Xapian::BAD_VALUENO) {
173 RegexpPostingSource *postings = new RegexpPostingSource (slot, regexp_str);
174 return Xapian::Query (postings->release ());
176 std::vector<std::string> terms;
179 compile_regex (regexp, regexp_str.c_str ());
180 for (Xapian::TermIterator it = notmuch->xapian_db->allterms_begin (term_prefix);
181 it != notmuch->xapian_db->allterms_end (); ++it) {
182 if (regexec (®exp, (*it).c_str () + term_prefix.size (),
184 terms.push_back (*it);
186 return Xapian::Query (Xapian::Query::OP_OR, terms.begin (), terms.end ());
189 throw Xapian::QueryParserError ("unmatched regex delimiter in '" + str + "'");
192 if (options & NOTMUCH_FIELD_PROBABILISTIC) {
193 /* TODO replace this with a nicer API level triggering of
194 * phrase parsing, when possible */
195 std::string query_str;
197 if (*str.rbegin () != '*' || str.find (' ') != std::string::npos)
198 query_str = '"' + str + '"';
202 return parser.parse_query (query_str, NOTMUCH_QUERY_PARSER_FLAGS, term_prefix);
205 std::string term = term_prefix + str;
206 return Xapian::Query (term);