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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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# Interface
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# ---------
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# new(file,objectref) : A new object - filename of file to parse
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# objectref->of the methods
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# usetags(tagobjref) : Specify a tagcontainer set to direct to
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# to the desired routines
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# usegroupchecker(groupchecker) : Set a groupchecker
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# parse() : Parse the file
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# checkparam($name,$par) : Exit with an error message if parameter
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# is undefined in tag $name
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# line() : return the current line number of the parse
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package Switcher;
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require 5.001;
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use Carp;
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sub new {
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my $class=shift;
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my $file=shift;
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my $objectname=shift;
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my $groupchecker=shift;
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my $self = {};
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$self->{allw}=$objectname;
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bless $self, $class;
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$self->_initialise($file);
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return $self;
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}
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sub _initialise (hash1) {
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my $self=shift;
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$self->{filename}=shift;
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# add a default groupchecker
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use ActiveDoc::GroupChecker;
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$self->{groupchecker}=GroupChecker->new();
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$self->{groupchecker}->include("all");
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# Add a default TagContainer
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use ActiveDoc::TagContainer;
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$self->{tagcontainer}=TagContainer->new();
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}
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sub usetags {
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my $self=shift;
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my $tagcontainer=shift;
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$self->{tagcontainer}=$tagcontainer;
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}
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sub usegroupchecker {
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my $self=shift;
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my $ref=shift;
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$self->{groupchecker}=$ref;
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}
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sub parse {
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my $self=shift;
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my $char;
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$self->{linecount}=0;
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$self->_resetvars();
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# Open the file
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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} $! \n";
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# Start file processing
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while ( <$filehandle> ) {
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$self->{linecount}++;
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$self->{currentline}=$_;
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$self->{stringpos}=0;
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while ( ($char=$self->_nextchar()) ne "" ) {
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$self->_checkchar($char);
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} # end char while
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} # End String while loop
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close $filehandle;
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}
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sub checkparam($name, $key) {
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my $self=shift;
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my $name=shift;
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my $key=shift;
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if ( ! defined $self->{tagvar}{$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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}
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#
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# return the current line number
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#
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sub line {
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my $self=shift;
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return $self->{linecount};
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}
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# --------------- Utility routines ----------------------------
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#
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# Some initialisation of test suites
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#
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sub _resetvars {
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my $self=shift;
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$self->{quotes}=0;
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$self->{lastlabel}="";
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$self->{textcontext}='none';
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$self->{tagcontext}="text";
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$self->_resetstore();
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}
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#
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# Check for control characters
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#
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sub _checkchar {
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my $self=shift;
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my $char=shift;
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my $string;
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# ---- In a tag
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if ( $self->{tagcontext}=~/tag/ ) {
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if ( ! $self->_quotetest($char) ) {
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if ( ! $self->_labeltest($char) ) {
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if ( $char eq ">") { $self->_closetag(); }
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else { $self->_putstore($char); }
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}
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}
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}
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# ------ Outside a tag
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else {
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if ( $char eq "<") { $self->_opentag() }
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else { $self->_putstore($char) }
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}
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}
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#
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# Return the next character from the current string buffer
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#
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sub _nextchar() {
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my $self=shift;
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my $char;
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$char=substr($self->{currentline},$self->{stringpos}++,1);
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# print "Debug : Fetching character $char\n";
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return $char;
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}
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sub _opentag {
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my $self=shift;
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my $char;
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# Close the last text segment
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$self->_calltag($self->{textcontext}, $self->{textcontext},
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$self->_getstore());
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$self->_resetstore();
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$self->_resetlabels();
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# Do we have an opening or closing tag?
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if ( ($char=$self->_nextchar()) eq "/" ) { #we have a closing tag
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$self->{tagcontext}="endtag";
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}
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else { # an opening tag
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$self->{tagcontext}="starttag";
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$self->_checkchar($char);
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}
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#print "\nDebug : Opening $self->{tagcontext}\n";
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}
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#
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# Close a tag
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#
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sub _closetag {
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my $self=shift;
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my $tagroutine;
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# -- Finish off any labels/get tagname
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$self->_closelabel();
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# -- Call the associated tag function if appropriate
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$tagroutine=$self->{tagname}."_".$self->{tagcontext};
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$self->_calltag($tagroutine, $self->{tagname},
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$self->{tagvar});
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#print "\nDebug : Closing Tag $tagroutine\n";
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# -- Now make sure the text context is set for calling routines to
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# -- deal with text portions outside of tags
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if ( $self->{tagcontext} eq "starttag" ) {
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push @{$self->{textstack}} , $self->{textcontext};
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$self->{textcontext}=$self->{tagname};
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}
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else {
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if ( $#{$self->{textstack}} > -1 ) {
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if ( $self->{textcontext} eq $self->{tagname} ) {
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$self->{textcontext}=pop @{$self->{textstack}};
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}
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else { #The tag we are closing is not the last one so
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# we keep our current context.
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$self->_removefromstack($self->{tagname},$self->{textstack});
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}
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}
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else { # more close tags than open ones
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print "Warning : Unmatched </...> tag on line ".
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$self->line()."\n";
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}
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}
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# Reset context back to text
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$self->{tagcontext}="text";
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}
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sub _calltag {
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my $self=shift;
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my $tagroutine=shift;
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my @args=@_;
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my $rt;
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if ( $self->{groupchecker}->status() ||
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( $self->{tagcontainer}->inquiregroup($tagroutine)) ) {
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$rt=$self->{tagcontainer}->getroutine($tagroutine);
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if ( $rt ne "" ) {
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&{$rt}( $self->{allw},@_);
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}
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}
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}
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sub _removefromstack {
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my $self=shift;
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my $name=shift;
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my $stack=shift;
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my $this;
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undef @tempstack;
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#print "In ----".$#{$stack};
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# Keep popping until we find our string
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while ( ($this=(pop @{$stack})) ne "$name") {
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push @tempstack, $this;
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if ( $#{$stack} < 0 ) { last; }
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}
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# Now put them back
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while ( $#tempstack>-1) {
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$this=pop @tempstack;
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push @{$stack}, $this;
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}
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#print " Out ----".$#{$stack};
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}
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#
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# Quote handling
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#
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sub _quotetest {
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my $self=shift;
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my $char=shift;
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# --- Are we already in a quote context?
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if ( $self->{quotes} ) {
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if ( $char eq $self->{openquote} ) {
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$self->{quotes}=0;
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}
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else {
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$self->_putstore($char);
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}
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}
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# --- Unquoted Context
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elsif ( (($char eq "\"") || ($char eq "\'") || ($char eq "\`")) ) {
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$self->{quotes}=1;
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$self->{openquote}=$char;
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}
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else { return 0; } # Return zero if not quoted
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return 1; # 1 otherwise
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}
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#
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# Label handling
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#
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sub _labeltest {
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my $self=shift;
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my $char=shift;
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# Spaces are markers between tags
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if ( ($char eq " ") || ($char eq "\n") || ($char eq "\t")) {
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$self->_closelabel();
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}
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# Check for a change in label status
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elsif ( $char eq "=" ) {
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$self->{lastlabel}=$self->_getstore();
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$self->_resetstore();
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}
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else {
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return 0;
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}
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return 1;
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}
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sub _resetlabels {
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my $self=shift;
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undef $self->{tagvar};
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}
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sub _closelabel {
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my $self=shift;
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# Do we have a label name?
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if ( $self->{lastlabel} ne "" ) {
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$self->{tagvar}{$self->{lastlabel}}=$self->_getstore();
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$self->{lastlabel}="";
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}
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elsif ( $self->_getstore() ne "") {
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#Then it must be the tag name
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($self->{tagname}=$self->_getstore())=~tr/A-Z/a-z/;
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}
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$self->_resetstore();
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}
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#
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# Character Store management interface
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#
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sub _putstore() {
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my $self=shift;
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my $char=shift;
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$self->{stringbuff}=$self->{stringbuff}.$char;
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}
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sub _getstore() {
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my $self=shift;
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return $self->{stringbuff};
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}
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sub _resetstore {
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my $self=shift;
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$self->{stringbuff}="";
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}
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