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# Switcher Module
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#
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# Look for elements given in input has in a string
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# If found then call a routine name with the same name
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# Implemented as an object to maintain state info between each line
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# processed.
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package Switcher;
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require 5.001;
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require Exporter;
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use Carp;
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@ISA = qw(Exporter);
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sub new {
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my $class=shift;
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my $hash=shift;
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my $file=shift;
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my $self = {};
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bless $self, $class;
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$self->_initialise($hash,$file);
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return $self;
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}
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sub _initialise (hash1) {
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my $self=shift;
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my $inlabelhash=shift;
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my $newkey;
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my $key;
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$self->{filename}=shift;
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$self->{labelhash}={};
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$self->{Strict_no_cr}='yes'; # set to 'no' to retain \n's
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# setup SGML type tag definitions
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# Others may be added without problems but ensure to provide
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# a closure with a hash value of the correct type
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# No capitals thanks.
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%{$self->{opencontext}}=(
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'<' => 'starttag',
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'</' => 'endtag'
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);
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%{$self->{closecontext}}= (
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">" => 'tag'
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);
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# Fill in the blanks in the user supplied hash
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if ( ! ( defined $$inlabelhash{'none'} )) { # check for none target
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$$inlabelhash{'none'}='none';
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}
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block1: foreach $key ( keys %$inlabelhash ) {
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($newkey=$key)=~tr[A-Z][a-z];
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${$self->{labelhash}}{$newkey}=$$inlabelhash{$key};
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foreach $context ( values %{$self->{opencontext}} ) {
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next block1 if $newkey=~/$context/i;
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}
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foreach $context ( values %{$self->{opencontext}} ) {
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if ( defined ${$self->{labelhash}}{$newkey."_".$context} ) {
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next block1;
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}
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# print "Setting ".$newkey."_".$context." = 'none'\n";
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${$self->{labelhash}}{$newkey."_".$context}='none';
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}
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}
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foreach $key ( %$self->{labelhash} ) {
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${$self->{ContextHash}}{$key} = 0;
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}
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$self->{InTag}="none";
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$taglabel="";
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$self->{tagblock}=[];
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@{$self->{lastcon}}= qw(none);
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}
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sub parse {
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my $self=shift;
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my $mykey="";
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my $key;
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my $word;
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my $filein="";
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$self->{linecount}=0;
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use FileHandle;
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my $filehandle=FileHandle->new();
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open( $filehandle , "$self->{filename}" )
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or carp "Switcher: Cannot open $self->{filename} $! \n";
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while ( <$filehandle> ) {
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if ( $self->{Strict_no_cr} eq 'yes' ) {
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chomp;
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}
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@{$self->{words}}=split /\b/;
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$self->{linecount}++;
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WHILELOOP: while ( ($word=shift @{$self->{words}}) ne "" ) {
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# print $word." --- Word\n";
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if ( $word=~/(>)(<.*)/ ) {
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unshift @{$self->{words}}, $2;
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$word=$1;
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}
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#test against opencontext
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foreach $mykey ( keys ( %{$self->{opencontext}}) ) {
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if ( $word=~/$mykey/i ) {
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# Send current tagblock (if its not empty)
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# to the Lastest Context Routine
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$self->_closeprevious();
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# Now carry on the parse
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$self->{InTag}=${$self->{opencontext}}{$mykey};
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$#{$self->{tagblock}}=-1;
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next WHILELOOP;
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}
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}
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#test against closed context
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foreach $key ( keys %{$self->{closecontext}} ) {
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if ( $word=~/$key/i ) {
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if ( $self->{InTag}=~/${$self->{closecontext}}{$key}/ ) {
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$temp=(shift @{$self->{tagblock}});
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$temp=~tr[A-Z][a-z];
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$rtname=($temp)."_".$self->{InTag};
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$self->{InTag}="none";
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# Do we call the tag init routine?
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if ( ( defined ( ${$self->{labelhash}}{$rtname} )) &&
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( ! ( ${$self->{labelhash}}{$rtname}=~/none/i )) ) {
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&{${$self->{labelhash}}{$rtname}}( $temp,
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@{$self->{tagblock}});
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}
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$self->_flipcontext($temp);
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$#{$self->{tagblock}}= -1;
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next WHILELOOP;
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}
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else {
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die "Unmatched \"$key\" on line $self->{linecount}"
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if $self->{InTag} eq "none";
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die "Error: Wrong closure \"$key\" on line $self->{linecount}";
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}
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}
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}
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push @{$self->{tagblock}}, $word;
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} #end word while
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} #end fileglob while
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$self->_closeprevious();
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close $filehandle;
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}
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sub context ($key) {
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my $self=shift;
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my $key=shift;
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$key=~tr[A-Z][a-z];
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return ( ${$self->{ContextHash}}{$key} );
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}
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# convert array of value=constants to a hash
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# returns reference to the array
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sub SetupValueHash(reftoarray) {
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my $self=shift;
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my $arrayref=shift;
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my $side="r";
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my $key='';
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my $thiskey;
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my $wordto="";
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my $word;
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my $quotes=0;
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local $varhash;
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$varhash = {};
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foreach $word ( @$arrayref ) {
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chomp;
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if ( $word=~/=/) {
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$side="l";
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if ( $word=~s/^=// ) {
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unshift @$arrayref, $word;
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}
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if ( $word=~s/^.*=// ) {
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($thiskey=$word)=~tr[A-Z][a-z]; #keys all lower case
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$key=$key.$thiskey;
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}
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next;
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}
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if ( $word=~/\"/ ) {
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$quotes= ( ! $quotes);
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if ( $word=~s/^"// ) {
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unshift @$arrayref, $word;
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}
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next;
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}
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if ( ( $word=~/\s/ ) && ( ! $quotes) ) {
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$side="r";
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if ( $key=~/./) {
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$$varhash{$key}=$wordto;
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}
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$key='';
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$wordto="";
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next;
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}
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if ( $side=~/r/) {
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($thiskey=$word)=~tr[A-Z][a-z]; #keys all lower case
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$key=$key.$thiskey;
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}
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else {
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$wordto=$wordto.$word;
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}
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}
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if ( $side=~/l/ ) { $$varhash{$key}=$wordto; }
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return $varhash;
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}
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sub _flipcontext(Hashkey) {
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my $self=shift;
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my $key = shift;
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${$self->{ContextHash}}{$key}=(! ${$self->{ContextHash}}{$key});
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# sort out the context stack
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if ( ! ${$self->{ContextHash}}{$key} ) {
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pop @{$self->{lastcon}};
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# print "** poping ".$key."\n";
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}
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else {
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# print "** pushing ".$key."\n";
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push @{$self->{lastcon}}, $key;
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}
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}
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sub _closeprevious {
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my $self=shift;
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if ( $#{$self->{tagblock}} != -1 ) {
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if (( defined
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${$self->{labelhash}}{${$self->{lastcon}}[$#{$self->{lastcon}}]} ) &&
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( ! ( ${$self->{labelhash}}{${$self->{lastcon}}[$#{$self->{lastcon}}]}
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=~/none/i )) ) {
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&{ ${$self->{labelhash}}{${$self->{lastcon}}[$#{$self->{lastcon}}]}}(
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${$self->{lastcon}}[$#{$self->{lastcon}}], @{$self->{tagblock}});
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}
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}
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}
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sub checkparam($hash, $name, $key) {
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my $self=shift;
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my $hashref=shift;
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my $name=shift;
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my $key=shift;
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if ( ! defined $$hashref{$key} ) {
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print "Switcher: Badly formed $name tag -".
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" undefined $key parameter\n";
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exit 1;
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}
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$$hashref{$key}=~s/["']//;
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}
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