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package String::Tokeniser; |
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use strict; |
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use vars qw($VERSION @ISA @EXPORT @EXPORT_OK); |
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use Carp; |
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require Exporter; |
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@ISA = qw(Exporter); |
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@EXPORT_OK = qw(); |
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$VERSION = '0.05'; |
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1; |
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=pod |
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=head1 NAME |
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String::Tokeniser - Perl extension for, uhm, tokenising strings. |
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=head1 SYNOPSIS |
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use String::Tokeniser; |
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=head1 DESCRIPTION |
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C provides an interface to a tokeniser class, allowing |
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one to manipulate strings on a token-by-token basis without having to |
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keep track of list element numbers and so on. |
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=head1 CONSTRUCTOR |
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=over 4 |
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=item new ( $sentence, [0|-1|$regexp], [$exception...] ) |
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Create a C, tokenises $sentence and resets the token |
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counter. |
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The next argument determines how a ``token'' is defined: a value of 0 or |
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C determines that underscores B included in a token; -1 states |
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that they are not. Alternatively, you can supply your own regular |
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expression which will be fed to a C to determine the tokens. |
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Then may optionally follow a list of exceptions: tokens that would be |
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split in two, but should be treated as one. |
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=back |
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=cut |
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sub new { |
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my $classname = shift; |
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my $self = {}; |
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bless($self, $classname); |
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my $sentence = shift; |
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carp "! Nothing to tokenise" unless defined $sentence; |
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my $style = shift || 0; |
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my @list; |
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if ($style==-1) { |
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$style= "(?<=[^a-zA-Z0-9])|(?=[^a-zA-Z0-9])"; |
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} elsif ($style) { |
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} else { |
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$style="(?<=[^a-zA-Z0-9_])|(?=[^a-zA-Z0-9_])"; |
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} |
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$self->{STYLE} = $style; |
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105
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@list = split /$style/, $sentence; |
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$self->{LIST} = \@list; |
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$self->{COUNT} = 0; |
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$self->{STACK} = []; |
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$self->_except(@_); # Exception handler. Is not fun. |
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return($self); |
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} |
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=pod |
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=head1 METHODS |
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=over 4 |
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=item moretokens |
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Tells you if you have any more tokens left to deal with. |
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=cut |
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sub moretokens { my $self = shift; |
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return ($self->{COUNT} <= $#{$self->{LIST}}) |
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} |
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=pod |
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=item skiptoken([n]) |
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Move the `pointer' forward one (or C) tokens. |
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=cut |
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sub skiptoken { my $self=shift; my $howmany=shift; |
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$howmany=1 unless defined $howmany; |
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$self->{COUNT}+=$howmany; |
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} |
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=pod |
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=item thistoken |
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Return the current token; that is, the token under the `pointer'. |
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=cut |
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sub thistoken { my $self=shift; |
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return $self->{LIST}->[$self->{COUNT}]; |
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} |
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=pod |
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=item lasttoken |
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Return the previous token; that is, the one just past the `pointer'. |
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=cut |
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sub lasttoken { my $self=shift; |
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return $self->{LIST}->[$self->{COUNT}-1]; |
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} |
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=pod |
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131
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=item gettoken |
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Equivalent to C - the usual way of grabbing the |
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next token in the list in turn. |
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=cut |
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sub gettoken { my $self=shift; |
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$self->skiptoken(); return $self->lasttoken();} |
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141
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=pod |
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143
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=item nexttoken |
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145
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Looks ahead one token, but does not change the `pointer' position. |
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147
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=cut |
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149
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0
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1
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sub nexttoken { my $self=shift; |
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return $self->{LIST}->[$self->{COUNT}+1]; |
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} |
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153
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=pod |
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155
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=item lookahead([n]) |
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157
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Returns a string composed of the next C tokens, but does not change |
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the `pointer' position. |
159
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160
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=cut |
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162
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1
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sub lookahead { my $self=shift; |
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my $howmany=shift; |
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croak "Silly value in lookahead" if $howmany <=1; |
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0
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my $ret=""; |
166
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0
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for (my $i=$self->{COUNT}; $i<$self->{COUNT}+$howmany; $i++) |
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{ $ret.= $self->{LIST}->[$i] } |
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return $ret; |
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} |
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171
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=pod |
172
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173
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=item gimme($string) |
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175
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Assuming a string of tokens will end in C<$string>, returns everything |
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from the current `pointer' position until the string is found. Returns |
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a two-element list: firsly, why the search terminated, (either C |
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meaning we hit the end of the token list without success, or C |
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meaning C<$string> was found.) and the rest of the tokens upto and |
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including C<$string> (or the end of the list, whichever was soonest). |
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182
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=cut |
183
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184
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1
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sub gimme { my ($self,$expectation)=(shift,shift); |
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my $why="EOF"; my $retval=""; |
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186
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while ($self->moretokens()) { |
187
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$retval.=$self->gettoken(); |
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if (substr($retval,-length($expectation)) eq $expectation) { |
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$why="FOUND"; |
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last |
191
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} |
192
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} |
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return ($why, $retval); |
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} |
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196
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=pod |
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198
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=item save |
199
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200
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Saves one's pointer position. Can be used multiply as a save stack. |
201
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202
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=cut |
203
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204
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0
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1
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sub save { my $self=shift; |
205
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0
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push @{$self->{STACK}}, $self->{COUNT}; |
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0
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206
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} |
207
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208
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=pod |
209
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210
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=item restore |
211
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212
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Restores a previously saved position. |
213
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214
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=cut |
215
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216
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0
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0
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1
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sub restore { my $self=shift; my $temp; |
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0
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217
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0
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$self->{COUNT}=$temp if $temp = pop @{$self->{STACK}}; |
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0
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218
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} |
219
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220
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=pod |
221
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222
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=back |
223
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224
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=head1 FEATURES |
225
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226
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At present, there is no support for exceptions which spread over three |
227
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or more tokens, although this is planned. |
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=head1 AUTHOR |
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Originaly written by Simon Cozens; |
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Maintained by Alberto Simoes C<> |
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=head1 SEE ALSO |
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L |
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=cut |
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# I have no idea how this works any more. And I've *only just* written |
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# it. |
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# -- Simon Cozens |
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# |
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# But it is correct, and simple! You just need to indent it correctly. |
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# |
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# -- Alberto Simoes |
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sub _except { |
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my $self = shift; |
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my $style = $self->{STYLE}; |
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my %decide; |
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my $listref=$self->{LIST}; |
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my @res; |
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while($_ = shift) { # was foreach(shift) { |
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my($left, $right) = split /$style/; |
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push @{$decide{$left}}, $right; |
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} |
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@_ = @$listref; |
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while (@_) { |
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my($first,$second) = (shift, shift || ""); |
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if (grep { $first eq $_ and scalar(grep { $second eq $_ } @{$decide{$_}}) } keys %decide ) { |
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264
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# I think |
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push(@res, $first.$second); |
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} else { |
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25
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push @res,$first; |
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22
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if (grep { $second eq $_ } keys %decide) { |
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269
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0
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unshift(@_, $second); |
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} else { |
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30
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push @res, $second; |
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} |
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} |
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} |
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2
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7
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$self->{LIST}=\@res; |
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2
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8
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return $self; |
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} |
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279
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# sub ishere { return 1 } |