public-inbox.git  about / heads / tags
an "archives first" approach to mailing lists
blob 0c37220c9dcf3884d1ddd2b096cb03e1b784fc3e 8437 bytes (raw)
$ git show HEAD:lib/PublicInbox/IMAPsearchqp.pm	# shows this blob on the CLI

  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
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
 
# Copyright (C) all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
# IMAP search query parser.  cf RFC 3501

# We currently compile Xapian queries to a string which is fed
# to Xapian's query parser.  However, we may use Xapian-provided
# Query object API to build an optree, instead.
package PublicInbox::IMAPsearchqp;
use strict;
use Parse::RecDescent;
use Time::Local qw(timegm);
use POSIX qw(strftime);
our $q = bless {}, __PACKAGE__; # singleton, reachable in generated P::RD
my @MoY = qw(JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC);
my %MM = map {; $MoY[$_-1] => sprintf('%02u', $_) } (1..12);

# IMAP to Xapian header search key mapping
my %IH2X = (
	SUBJECT => 's:',
	BODY => 'b:',
	# TEXT => undef, # => everything
	FROM => 'f:',
	TO => 't:',
	CC => 'c:',
	# BCC => 'bcc:', # TODO

	# IMAP allows searching arbitrary headers via
	# "HEADER $field_name $string" which gets silly expensive.
	# We only allow the headers we already index.
	'MESSAGE-ID' => 'm:',
	'LIST-ID' => 'l:',
	# KEYWORD # TODO ? dfpre,dfpost,...
);

sub uid_set_xap ($$) {
	my ($self, $seq_set) = @_;
	my @u;
	do {
		my $u = $self->{imap}->range_step(\$seq_set);
		die $u unless ref($u); # break out of the parser on error
		push @u, "uid:$u->[0]..$u->[1]";
	} while ($seq_set);
	push(@{$q->{xap}}, @u > 1 ? '('.join(' OR ', @u).')' : $u[0]);
}

sub xap_only ($;$) {
	my ($self, $query) = @_;
	delete $self->{sql}; # query too complex for over.sqlite3
	push @{$self->{xap}}, $query if defined($query);

	# looks like we can't use SQLite-only, convert SQLite UID
	# ranges to Xapian:
	if (my $uid = delete $self->{uid}) {
		uid_set_xap($self, $_) for @$uid;
	}
	1;
}

sub ih2x {
	my ($self, $field_name, $s) = @_; # $self == $q
	$s =~ /\A"(.*?)"\z/s and $s = $1;

	# AFAIK Xapian can't handle [*"] in probabilistic terms,
	# and it relies on lowercase
	my $xk = defined($field_name) ? ($IH2X{$field_name} // '') : '';
	xap_only($self,
		lc(join(' ', map { qq[$xk"$_"] } split(/[\*"\s]+/, $s))));
	1;
}

sub subq_enter {
	xap_only($q);
	my $old = delete($q->{xap}) // [];
	my $nr = push @{$q->{stack}}, $old;
	die 'BAD deep recursion' if $nr > 10;
	$q->{xap} = [];
}

sub subq_leave {
	my $child = delete $q->{xap};
	my $parent = $q->{xap} = pop @{$q->{stack}};
	push(@$parent, @$child > 1 ? '('.join(' ', @$child).')' : $child->[0]);
	1;
}

sub yyyymmdd ($) {
	my ($item) = @_;
	my ($dd, $mon, $yyyy) = split(/-/, $item->{date}, 3);
	my $mm = $MM{$mon} // die "BAD month: $mon";
	wantarray ? ($yyyy, $mm, sprintf('%02u', $dd))
		: timegm(0, 0, 0, $dd, $mm - 1, $yyyy);
}

sub SENTSINCE {
	my ($self, $item) = @_;
	my ($yyyy, $mm, $dd) = yyyymmdd($item);
	push @{$self->{xap}}, "d:$yyyy$mm$dd..";
	my $sql = $self->{sql} or return 1;
	my $ds = timegm(0, 0, 0, $dd, $mm - 1, $yyyy);
	$$sql .= " AND ds >= $ds";
}

sub SENTON {
	my ($self, $item) = @_;
	my ($yyyy, $mm, $dd) = yyyymmdd($item);
	my $ds = timegm(0, 0, 0, $dd, $mm - 1, $yyyy);
	my $end = $ds + 86399; # no leap day
	my $dt_end = strftime('%Y%m%d%H%M%S', gmtime($end));
	push @{$self->{xap}}, "dt:$yyyy$mm$dd"."000000..$dt_end";
	my $sql = $self->{sql} or return 1;
	$$sql .= " AND ds >= $ds AND ds <= $end";
}

sub SENTBEFORE {
	my ($self, $item) = @_;
	my ($yyyy, $mm, $dd) = yyyymmdd($item);
	push @{$self->{xap}}, "d:..$yyyy$mm$dd";
	my $sql = $self->{sql} or return 1;
	my $ds = timegm(0, 0, 0, $dd, $mm - 1, $yyyy);
	$$sql .= " AND ds <= $ds";
}

sub ON {
	my ($self, $item) = @_;
	my $ts = yyyymmdd($item);
	my $end = $ts + 86399; # no leap day
	push @{$self->{xap}}, "rt:$ts..$end";
	my $sql = $self->{sql} or return 1;
	$$sql .= " AND ts >= $ts AND ts <= $end";
}

sub BEFORE {
	my ($self, $item) = @_;
	my $ts = yyyymmdd($item);
	push @{$self->{xap}}, "rt:..$ts";
	my $sql = $self->{sql} or return 1;
	$$sql .= " AND ts <= $ts";
}

sub SINCE {
	my ($self, $item) = @_;
	my $ts = yyyymmdd($item);
	push @{$self->{xap}}, "rt:$ts..";
	my $sql = $self->{sql} or return 1;
	$$sql .= " AND ts >= $ts";
}

sub uid_set ($$) {
	my ($self, $seq_set) = @_;
	if ($self->{sql}) {
		push @{$q->{uid}}, $seq_set;
	} else { # we've gone Xapian-only
		uid_set_xap($self, $seq_set);
	}
	1;
}

sub msn_set {
	my ($self, $seq_set) = @_;
	PublicInbox::IMAP::msn_to_uid_range(
		$self->{msn2uid} //= $self->{imap}->msn2uid, $seq_set);
	uid_set($self, $seq_set);
}

# things that should not match
sub impossible {
	my ($self) = @_;
	push @{$self->{xap}}, 'z:..0';
	my $sql = $self->{sql} or return 1;
	$$sql .= ' AND num < 0';
}

my $prd = Parse::RecDescent->new(<<'EOG');
<nocheck>
{ my $q = $PublicInbox::IMAPsearchqp::q; }
search_key : CHARSET(?) search_key1(s) { $return = $q }

# n.b. we silently ignore most per-message flags right now;
# they're here for now to not dump parser errors.
search_key1 : "ALL" | "ANSWERED" | "RECENT" | "UNSEEN" | "SEEN" | "NEW"
	| "UNANSWERED" | "UNDELETED" | "UNDRAFT" | "UNFLAGGED"
	| DELETED | DRAFT | FLAGGED | OLD
	| OR_search_keys
	| NOT_search_key
	| LARGER_number
	| SMALLER_number
	| SENTSINCE_date
	| SENTON_date
	| SENTBEFORE_date
	| SINCE_date
	| ON_date
	| BEFORE_date
	| FROM_string
	| HEADER_field_name_string
	| TO_string
	| CC_string
	| BCC_string
	| SUBJECT_string
	| BODY_string
	| TEXT_string
	| UID_set
	| MSN_set
	| sub_query
	| <error>

charset : /\S+/
CHARSET : 'CHARSET' charset
{ $item{charset} =~ /\A(?:UTF-8|US-ASCII)\z/ ? 1 : die('NO [BADCHARSET]'); }

SENTSINCE_date : 'SENTSINCE' date { $q->SENTSINCE(\%item) }
SENTON_date : 'SENTON' date { $q->SENTON(\%item) }
SENTBEFORE_date : 'SENTBEFORE' date { $q->SENTBEFORE(\%item) }

SINCE_date : 'SINCE' date { $q->SINCE(\%item) }
ON_date : 'ON' date { $q->ON(\%item) }
BEFORE_date : 'BEFORE' date { $q->BEFORE(\%item) }

MSN_set : sequence_set { $q->msn_set($item{sequence_set}) }
UID_set : "UID" sequence_set { $q->uid_set($item{sequence_set}) }
LARGER_number : "LARGER" number { $q->xap_only("z:$item{number}..") }
SMALLER_number : "SMALLER" number { $q->xap_only("z:..$item{number}") }

DELETED : "DELETED" { $q->impossible }
OLD : "OLD" { $q->impossible }
FLAGGED : "FLAGGED" { $q->impossible }
DRAFT : "DRAFT" { $q->impossible }

# pass "NOT" through XXX is this right?
OP_NOT : "NOT" { $q->xap_only('NOT') }
NOT_search_key : OP_NOT search_key1
OP_OR : "OR" {
	$q->xap_only('OP_OR');
	my $cur = delete $q->{xap};
	push @{$q->{stack}}, $cur;
	$q->{xap} = [];
}
search_key_a : search_key1
{
	my $ka = delete $q->{xap};
	$q->{xap} = [];
	push @{$q->{stack}}, $ka;
}
OR_search_keys : OP_OR search_key_a search_key1
{
	my $kb = delete $q->{xap};
	my $ka = pop @{$q->{stack}};
	my $xap = $q->{xap} = pop @{$q->{stack}};
	my $op = pop @$xap;
	$op eq 'OP_OR' or die "BAD expected OR: $op";
	$ka = @$ka > 1 ? '('.join(' ', @$ka).')' : $ka->[0];
	$kb = @$kb > 1 ? '('.join(' ', @$kb).')' : $kb->[0];
	push @$xap, "($ka OR $kb)";
}
HEADER_field_name_string : "HEADER" field_name string
{
	$q->ih2x($item{field_name}, $item{string});
}
FROM_string : "FROM" string { $q->ih2x('FROM', $item{string}) }
TO_string : "TO" string { $q->ih2x('TO', $item{string}) }
CC_string : "CC" string { $q->ih2x('CC', $item{string}) }
BCC_string : "BCC" string { $q->ih2x('BCC', $item{string}) }
SUBJECT_string : "SUBJECT" string { $q->ih2x('SUBJECT', $item{string}) }
BODY_string : "BODY" string { $q->ih2x('BODY', $item{string}) }
TEXT_string : "TEXT" string { $q->ih2x(undef, $item{string}) }
op_subq_enter : '(' { $q->subq_enter }
sub_query : op_subq_enter search_key1(s) ')' { $q->subq_leave }

field_name : /[\x21-\x39\x3b-\x7e]+/
string : quoted | literal
literal : /[^"\(\) \t]+/ # bogus, I know
quoted : /"[^"]*"/
number : /[0-9]+/
date : /[0123]?[0-9]-[A-Z]{3}-[0-9]{4,}/
sequence_set : /\A[0-9][0-9,:]*[0-9\*]?\z/
EOG

sub parse {
	my ($imap, $query) = @_;
	my $sql = '';
	%$q = (sql => \$sql, imap => $imap); # imap = PublicInbox::IMAP obj
	# $::RD_TRACE = 1;
	local $::RD_ERRORS = undef;
	local $::RD_WARN = undef;
	my $res = eval { $prd->search_key(uc($query)) };
	return $@ if $@ && $@ =~ /\A(?:BAD|NO) /;
	return 'BAD unexpected result' if !$res || $res != $q;
	if (exists $q->{sql}) {
		delete $q->{xap};
		if (my $uid = delete $q->{uid}) {
			my @u;
			for my $uid_set (@$uid) {
				my $u = $q->{imap}->range_step(\$uid_set);
				return $u if !ref($u);
				push @u, "num >= $u->[0] AND num <= $u->[1]";
			}
			$sql .= ' AND ('.join(' OR ', @u).')';
		}
	} else {
		$q->{xap} = join(' ', @{$q->{xap}});
	}
	delete @$q{qw(imap msn2uid)};
	$q;
}

1

git clone https://public-inbox.org/public-inbox.git
git clone http://7fh6tueqddpjyxjmgtdiueylzoqt6pt7hec3pukyptlmohoowvhde4yd.onion/public-inbox.git