unofficial mirror of notmuch@notmuchmail.org
 help / color / mirror / code / Atom feed
blob 7ae55e70016c1f5e26c8b3c47dc1a5a5624e5b2d 4817 bytes (raw)
name: lib/regexp-fields.cc 	 # note: path name is non-authoritative(*)

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
 
/* regexp-fields.cc - field processor glue for regex supporting fields
 *
 * This file is part of notmuch.
 *
 * Copyright © 2015 Austin Clements
 * Copyright © 2016 David Bremner
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see https://www.gnu.org/licenses/ .
 *
 * Author: Austin Clements <aclements@csail.mit.edu>
 *                David Bremner <david@tethera.net>
 */

#include "regexp-fields.h"
#include "notmuch-private.h"
#include "database-private.h"

#if HAVE_XAPIAN_FIELD_PROCESSOR
static void
compile_regex (regex_t &regexp, const char *str)
{
    int err = regcomp (&regexp, str, REG_EXTENDED | REG_NOSUB);

    if (err != 0) {
	size_t len = regerror (err, &regexp, NULL, 0);
	char *buffer = new char[len];
	std::string msg;
	(void) regerror (err, &regexp, buffer, len);
	msg.assign (buffer, len);
	delete[] buffer;

	throw Xapian::QueryParserError (msg);
    }
}

RegexpPostingSource::RegexpPostingSource (Xapian::valueno slot, const std::string &regexp)
    : slot_ (slot)
{
    compile_regex (regexp_, regexp.c_str ());
}

RegexpPostingSource::~RegexpPostingSource ()
{
    regfree (&regexp_);
}

void
RegexpPostingSource::init (const Xapian::Database &db)
{
    db_ = db;
    it_ = db_.valuestream_begin (slot_);
    end_ = db.valuestream_end (slot_);
    started_ = false;
}

Xapian::doccount
RegexpPostingSource::get_termfreq_min () const
{
    return 0;
}

Xapian::doccount
RegexpPostingSource::get_termfreq_est () const
{
    return get_termfreq_max () / 2;
}

Xapian::doccount
RegexpPostingSource::get_termfreq_max () const
{
    return db_.get_value_freq (slot_);
}

Xapian::docid
RegexpPostingSource::get_docid () const
{
    return it_.get_docid ();
}

bool
RegexpPostingSource::at_end () const
{
    return it_ == end_;
}

void
RegexpPostingSource::next (unused (double min_wt))
{
    if (started_ && ! at_end ())
	++it_;
    started_ = true;

    for (; ! at_end (); ++it_) {
	std::string value = *it_;
	if (regexec (&regexp_, value.c_str (), 0, NULL, 0) == 0)
	    break;
    }
}

void
RegexpPostingSource::skip_to (Xapian::docid did, unused (double min_wt))
{
    started_ = true;
    it_.skip_to (did);
    for (; ! at_end (); ++it_) {
	std::string value = *it_;
	if (regexec (&regexp_, value.c_str (), 0, NULL, 0) == 0)
	    break;
    }
}

bool
RegexpPostingSource::check (Xapian::docid did, unused (double min_wt))
{
    started_ = true;
    if (!it_.check (did) || at_end ())
	return false;
    return (regexec (&regexp_, (*it_).c_str (), 0, NULL, 0) == 0);
}

static inline Xapian::valueno _find_slot (std::string prefix)
{
    if (prefix == "from")
	return NOTMUCH_VALUE_FROM;
    else if (prefix == "subject")
	return NOTMUCH_VALUE_SUBJECT;
    else if (prefix == "mid")
	return NOTMUCH_VALUE_MESSAGE_ID;
    else
	throw Xapian::QueryParserError ("unsupported regexp field '" + prefix + "'");
}

RegexpFieldProcessor::RegexpFieldProcessor (std::string prefix,
					    notmuch_field_flag_t options_,
					    Xapian::QueryParser &parser_,
					    notmuch_database_t *notmuch_)
	: slot (_find_slot (prefix)),
	  term_prefix (_find_prefix (prefix.c_str ())),
	  options (options_),
	  parser (parser_),
	  notmuch (notmuch_)
{
};

Xapian::Query
RegexpFieldProcessor::operator() (const std::string & str)
{
    if (str.size () == 0)
	return Xapian::Query(Xapian::Query::OP_AND_NOT,
			     Xapian::Query::MatchAll,
			     Xapian::Query (Xapian::Query::OP_WILDCARD, term_prefix));

    if (str.at (0) == '/') {
	if (str.at (str.size () - 1) == '/'){
	    RegexpPostingSource *postings = new RegexpPostingSource (slot, str.substr(1,str.size () - 2));
	    return Xapian::Query (postings->release ());
	} else {
	    throw Xapian::QueryParserError ("unmatched regex delimiter in '" + str + "'");
	}
    } else {
	if (options & NOTMUCH_FIELD_PROBABILISTIC) {
	    /* TODO replace this with a nicer API level triggering of
	     * phrase parsing, when possible */
	    std::string query_str;

	    if (str.find (' ') != std::string::npos)
		query_str = '"' + str + '"';
	    else
		query_str = str;

	    return parser.parse_query (query_str, NOTMUCH_QUERY_PARSER_FLAGS, term_prefix);
	} else {
	    /* Boolean prefix */
	    std::string term = term_prefix + str;
	    return Xapian::Query (term);
	}
    }
}
#endif

debug log:

solving 7ae55e70 ...
found 7ae55e70 in https://yhetil.org/notmuch.git/

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this public inbox

	https://yhetil.org/notmuch.git/

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).