[0ff8d110] | 1 | ############################################################################## |
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| 2 | # |
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| 3 | # This library is free software; you can redistribute it and/or |
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| 4 | # modify it under the terms of the GNU Library General Public |
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| 5 | # License as published by the Free Software Foundation; either |
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| 6 | # version 2 of the License, or (at your option) any later version. |
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| 7 | # |
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| 8 | # This library is distributed in the hope that it will be useful, |
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| 9 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 10 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 11 | # Library General Public License for more details. |
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| 12 | # |
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| 13 | # You should have received a copy of the GNU Library General Public |
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| 14 | # License along with this library; if not, write to the |
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| 15 | # Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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| 16 | # Boston, MA 02111-1307, USA. |
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| 17 | # |
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| 18 | # Jabber |
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| 19 | # Copyright (C) 1998-2004 Jabber Software Foundation http://jabber.org/ |
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| 20 | # |
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| 21 | ############################################################################## |
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| 22 | |
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| 23 | package XML::Stream::XPath::Query; |
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| 24 | |
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| 25 | use 5.006_001; |
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| 26 | use strict; |
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| 27 | use Carp; |
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| 28 | use vars qw( $VERSION ); |
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| 29 | |
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| 30 | $VERSION = "1.22"; |
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| 31 | |
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| 32 | sub new |
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| 33 | { |
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| 34 | my $proto = shift; |
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| 35 | my $self = { }; |
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| 36 | |
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| 37 | bless($self,$proto); |
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| 38 | |
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| 39 | $self->{TOKENS} = [ '/','[',']','@','"',"'",'=','!','(',')',':',' ',',']; |
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| 40 | $self->{QUERY} = shift; |
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| 41 | |
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| 42 | if (!defined($self->{QUERY}) || ($self->{QUERY} eq "")) |
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| 43 | { |
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| 44 | confess("No query string specified"); |
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| 45 | } |
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| 46 | |
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| 47 | $self->parseQuery(); |
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| 48 | |
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| 49 | return $self; |
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| 50 | } |
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| 51 | |
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| 52 | |
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| 53 | sub getNextToken |
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| 54 | { |
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| 55 | my $self = shift; |
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| 56 | my $pos = shift; |
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| 57 | |
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| 58 | my @toks = grep{ $_ eq substr($self->{QUERY},$$pos,1)} @{$self->{TOKENS}}; |
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| 59 | while( $#toks == -1 ) |
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| 60 | { |
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| 61 | $$pos++; |
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| 62 | if ($$pos > length($self->{QUERY})) |
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| 63 | { |
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| 64 | $$pos = length($self->{QUERY}); |
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| 65 | return 0; |
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| 66 | } |
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| 67 | @toks = grep{ $_ eq substr($self->{QUERY},$$pos,1)} @{$self->{TOKENS}}; |
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| 68 | } |
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| 69 | |
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| 70 | return $toks[0]; |
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| 71 | } |
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| 72 | |
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| 73 | |
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| 74 | sub getNextIdentifier |
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| 75 | { |
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| 76 | my $self = shift; |
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| 77 | my $pos = shift; |
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| 78 | my $sp = $$pos; |
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| 79 | $self->getNextToken($pos); |
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| 80 | return substr($self->{QUERY},$sp,$$pos-$sp); |
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| 81 | } |
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| 82 | |
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| 83 | |
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| 84 | sub getOp |
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| 85 | { |
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| 86 | my $self = shift; |
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| 87 | my $pos = shift; |
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| 88 | my $in_context = shift; |
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| 89 | $in_context = 0 unless defined($in_context); |
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| 90 | |
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| 91 | my $ret_op; |
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| 92 | |
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| 93 | my $loop = 1; |
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| 94 | while( $loop ) |
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| 95 | { |
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| 96 | my $pos_start = $$pos; |
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| 97 | |
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| 98 | my $token = $self->getNextToken($pos); |
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| 99 | if (($token eq "0") && $in_context) |
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| 100 | { |
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| 101 | return; |
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| 102 | } |
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| 103 | |
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| 104 | my $token_start = ++$$pos; |
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| 105 | my $ident; |
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| 106 | |
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| 107 | if (defined($token)) |
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| 108 | { |
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| 109 | |
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| 110 | if ($pos_start != ($token_start-1)) |
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| 111 | { |
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| 112 | $$pos = $pos_start; |
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| 113 | my $temp_ident = $self->getNextIdentifier($pos); |
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| 114 | $ret_op = new XML::Stream::XPath::NodeOp($temp_ident,"0"); |
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| 115 | } |
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| 116 | elsif ($token eq "/") |
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| 117 | { |
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| 118 | if (substr($self->{QUERY},$token_start,1) eq "/") |
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| 119 | { |
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| 120 | $$pos++; |
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| 121 | my $temp_ident = $self->getNextIdentifier($pos); |
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| 122 | $ret_op = new XML::Stream::XPath::AllOp($temp_ident); |
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| 123 | } |
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| 124 | else |
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| 125 | { |
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| 126 | my $temp_ident = $self->getNextIdentifier($pos); |
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| 127 | if ($temp_ident ne "") |
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| 128 | { |
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| 129 | $ret_op = new XML::Stream::XPath::NodeOp($temp_ident,($pos_start == 0 ? "1" : "0")); |
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| 130 | } |
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| 131 | } |
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| 132 | } |
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| 133 | elsif ($token eq "\@") |
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| 134 | { |
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| 135 | $ret_op = new XML::Stream::XPath::AttributeOp($self->getNextIdentifier($pos)); |
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| 136 | } |
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| 137 | elsif ($token eq "]") |
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| 138 | { |
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| 139 | if ($in_context eq "[") |
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| 140 | { |
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| 141 | $ret_op = pop(@{$self->{OPS}}); |
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| 142 | $in_context = 0; |
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| 143 | } |
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| 144 | else |
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| 145 | { |
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| 146 | confess("Found ']' but not in context"); |
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| 147 | return; |
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| 148 | } |
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| 149 | } |
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| 150 | elsif (($token eq "\"") || ($token eq "\'")) |
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| 151 | { |
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| 152 | $$pos = index($self->{QUERY},$token,$token_start); |
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| 153 | $ret_op = new XML::Stream::XPath::Op("LITERAL",substr($self->{QUERY},$token_start,$$pos-$token_start)); |
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| 154 | $$pos++; |
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| 155 | } |
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| 156 | elsif ($token eq " ") |
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| 157 | { |
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| 158 | $ident = $self->getNextIdentifier($pos); |
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| 159 | if ($ident eq "and") |
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| 160 | { |
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| 161 | $$pos++; |
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| 162 | my $tmp_op = $self->getOp($pos,$in_context); |
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| 163 | if (!defined($tmp_op)) |
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| 164 | { |
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| 165 | confess("Invalid 'and' operation"); |
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| 166 | return; |
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| 167 | } |
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| 168 | $ret_op = new XML::Stream::XPath::AndOp($self->{OPS}->[$#{$self->{OPS}}],$tmp_op); |
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| 169 | $in_context = 0; |
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| 170 | pop(@{$self->{OPS}}); |
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| 171 | } |
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| 172 | elsif ($ident eq "or") |
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| 173 | { |
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| 174 | $$pos++; |
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| 175 | my $tmp_op = $self->getOp($pos,$in_context); |
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| 176 | if (!defined($tmp_op)) |
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| 177 | { |
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| 178 | confess("Invalid 'or' operation"); |
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| 179 | return; |
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| 180 | } |
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| 181 | $ret_op = new XML::Stream::XPath::OrOp($self->{OPS}->[$#{$self->{OPS}}],$tmp_op); |
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| 182 | $in_context = 0; |
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| 183 | pop(@{$self->{OPS}}); |
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| 184 | } |
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| 185 | } |
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| 186 | elsif ($token eq "[") |
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| 187 | { |
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| 188 | if ($self->getNextToken($pos) eq "]") |
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| 189 | { |
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| 190 | if ($$pos == $token_start) |
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| 191 | { |
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| 192 | confess("Nothing in the []"); |
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| 193 | return; |
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| 194 | } |
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| 195 | |
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| 196 | $$pos = $token_start; |
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| 197 | my $val = $self->getNextIdentifier($pos); |
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| 198 | if ($val =~ /^\d+$/) |
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| 199 | { |
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| 200 | $ret_op = new XML::Stream::XPath::PositionOp($val); |
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| 201 | $$pos++; |
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| 202 | } |
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| 203 | else |
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| 204 | { |
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| 205 | $$pos = $pos_start + 1; |
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| 206 | $ret_op = new XML::Stream::XPath::ContextOp($self->getOp($pos,$token)); |
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| 207 | } |
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| 208 | } |
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| 209 | else |
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| 210 | { |
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| 211 | $$pos = $pos_start + 1; |
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| 212 | $ret_op = new XML::Stream::XPath::ContextOp($self->getOp($pos,$token)); |
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| 213 | } |
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| 214 | } |
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| 215 | elsif ($token eq "(") |
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| 216 | { |
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| 217 | #------------------------------------------------------------- |
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| 218 | # The function name would have been mistaken for a NodeOp. |
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| 219 | # Pop it off the back and get the function name. |
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| 220 | #------------------------------------------------------------- |
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| 221 | my $op = pop(@{$self->{OPS}}); |
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| 222 | if ($op->getType() ne "NODE") |
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| 223 | { |
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| 224 | confess("No function name specified."); |
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| 225 | } |
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| 226 | my $function = $op->getValue(); |
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| 227 | if (!exists($XML::Stream::XPath::FUNCTIONS{$function})) |
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| 228 | { |
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| 229 | confess("Undefined function \"$function\""); |
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| 230 | } |
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| 231 | $ret_op = new XML::Stream::XPath::FunctionOp($function); |
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| 232 | |
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| 233 | my $op_pos = $#{$self->{OPS}} + 1; |
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| 234 | |
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| 235 | $self->getOp($pos,$token); |
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| 236 | |
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| 237 | foreach my $arg ($op_pos..$#{$self->{OPS}}) |
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| 238 | { |
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| 239 | $ret_op->addArg($self->{OPS}->[$arg]); |
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| 240 | } |
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| 241 | |
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| 242 | splice(@{$self->{OPS}},$op_pos); |
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| 243 | |
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| 244 | } |
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| 245 | elsif ($token eq ")") |
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| 246 | { |
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| 247 | if ($in_context eq "(") |
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| 248 | { |
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| 249 | $ret_op = undef; |
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| 250 | $in_context = 0; |
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| 251 | } |
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| 252 | else |
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| 253 | { |
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| 254 | confess("Found ')' but not in context"); |
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| 255 | } |
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| 256 | } |
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| 257 | elsif ($token eq ",") |
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| 258 | { |
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| 259 | if ($in_context ne "(") |
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| 260 | { |
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| 261 | confess("Found ',' but not in a function"); |
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| 262 | } |
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| 263 | |
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| 264 | } |
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| 265 | elsif ($token eq "=") |
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| 266 | { |
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| 267 | my $tmp_op; |
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| 268 | while(!defined($tmp_op)) |
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| 269 | { |
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| 270 | $tmp_op = $self->getOp($pos); |
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| 271 | } |
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| 272 | $ret_op = new XML::Stream::XPath::EqualOp($self->{OPS}->[$#{$self->{OPS}}],$tmp_op); |
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| 273 | pop(@{$self->{OPS}}); |
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| 274 | } |
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| 275 | elsif ($token eq "!") |
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| 276 | { |
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| 277 | if (substr($self->{QUERY},$token_start,1) ne "=") |
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| 278 | { |
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| 279 | confess("Badly formed !="); |
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| 280 | } |
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| 281 | $$pos++; |
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| 282 | |
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| 283 | my $tmp_op; |
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| 284 | while(!defined($tmp_op)) |
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| 285 | { |
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| 286 | $tmp_op = $self->getOp($pos); |
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| 287 | } |
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| 288 | $ret_op = new XML::Stream::XPath::NotEqualOp($self->{OPS}->[$#{$self->{OPS}}],$tmp_op); |
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| 289 | pop(@{$self->{OPS}}); |
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| 290 | } |
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| 291 | else |
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| 292 | { |
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| 293 | confess("Unhandled \"$token\""); |
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| 294 | } |
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| 295 | |
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| 296 | if ($in_context) |
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| 297 | { |
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| 298 | if (defined($ret_op)) |
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| 299 | { |
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| 300 | push(@{$self->{OPS}},$ret_op); |
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| 301 | } |
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| 302 | $ret_op = undef; |
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| 303 | } |
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| 304 | } |
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| 305 | else |
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| 306 | { |
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| 307 | confess("Token undefined"); |
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| 308 | } |
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| 309 | |
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| 310 | $loop = 0 unless $in_context; |
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| 311 | } |
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| 312 | |
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| 313 | return $ret_op; |
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| 314 | } |
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| 315 | |
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| 316 | |
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| 317 | sub parseQuery |
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| 318 | { |
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| 319 | my $self = shift; |
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| 320 | my $query = shift; |
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| 321 | |
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| 322 | my $op; |
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| 323 | my $pos = 0; |
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| 324 | while($pos < length($self->{QUERY})) |
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| 325 | { |
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| 326 | $op = $self->getOp(\$pos); |
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| 327 | if (defined($op)) |
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| 328 | { |
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| 329 | push(@{$self->{OPS}},$op); |
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| 330 | } |
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| 331 | } |
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| 332 | |
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| 333 | #foreach my $op (@{$self->{OPS}}) |
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| 334 | #{ |
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| 335 | # $op->display(); |
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| 336 | #} |
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| 337 | |
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| 338 | return 1; |
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| 339 | } |
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| 340 | |
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| 341 | |
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| 342 | sub execute |
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| 343 | { |
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| 344 | my $self = shift; |
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| 345 | my $root = shift; |
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| 346 | |
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| 347 | my $ctxt = new XML::Stream::XPath::Value($root); |
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| 348 | |
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| 349 | foreach my $op (@{$self->{OPS}}) |
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| 350 | { |
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| 351 | if (!$op->isValid(\$ctxt)) |
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| 352 | { |
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| 353 | $ctxt->setValid(0); |
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| 354 | return $ctxt; |
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| 355 | } |
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| 356 | } |
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| 357 | |
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| 358 | $ctxt->setValid(1); |
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| 359 | return $ctxt; |
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| 360 | } |
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| 361 | |
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| 362 | |
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| 363 | sub check |
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| 364 | { |
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| 365 | my $self = shift; |
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| 366 | my $root = shift; |
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| 367 | |
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| 368 | my $ctxt = $self->execute($root); |
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| 369 | return $ctxt->check(); |
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| 370 | } |
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| 371 | |
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| 372 | |
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| 373 | 1; |
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| 374 | |
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