-# Template.pm
+package Template;
-# ====================================================
-# Autor: n.d.p. / 2001-01-06
-# lm : n.d.p. / 2001-01-25
-# ====================================================
-# Funktion:
-# Ausfuellen von Templates
-# ====================================================
+################################################################################
+# #
+# File: shared/Template.pm #
+# #
+# Authors: André Malo <nd@o3media.de> #
+# Frank Schönmann <fs@tower.de> #
+# #
+# Description: Handle XML based HTML-Templates #
+# #
+################################################################################
use strict;
+use vars qw(
+ $xml_dom_used
+);
+
+use Carp qw(croak);
+
+BEGIN {
+ $xml_dom_used = eval q[
+ local $SIG{__DIE__};
+ use XML::DOM;
+ 1;
+ ];
+}
-package Template;
-
-use autouse 'Carp' => qw(croak confess);
-use XML::DOM;
+################################################################################
+#
+# Version check
+#
+# last modified:
+# $Date$ (GMT)
+# by $Author$
+#
+sub VERSION {(q$Revision$ =~ /([\d.]+)\s*$/)[0] or '0.0'}
-# ====================================================
-# Methoden
-# ====================================================
-################################
-# sub new
+### sub new ####################################################################
+#
+# constructor
+#
+# Params: ~none~
+#
+# Return: Template object
#
-# Konstruktor
-################################
-
sub new {
- my $instance=shift;
- my $class=(ref($instance) or $instance);
+ my $instance = shift;
- my $self = {};
- $self = bless $self,$class;
+ my $self = bless {} => ref($instance) || $instance;
$self -> file (+shift);
- # Rueckgabe
+ # return
$self;
}
-################################
-# sub file
+### sub file ###################################################################
+#
+# assign new template file to object
+# parse the template file
+#
+# Params: $new - (optional) new template file
+#
+# Return: scalar - old filename or if there's no old filename given
#
-# Datei zuweisen und parsen
-################################
-
sub file {
my $self = shift;
- my $old = $self -> {file};
- my $new = shift;
+ my $new = shift;
+ my $old = $self -> {file};
$self -> {file} = $new if (defined $new);
$self -> parse_file;
+ # return
$old;
}
-################################
-# sub insert
+### sub insert #################################################################
+#
+# return the placeholder surrounded by meta delimiters
+#
+# Params: $name - name of placeholder
+#
+# Return: scalar - placeholder surrounded by meta delimiters
#
-# Bezeichner in Metazeichen
-# eingeschlossen zurueckgeben
-################################
-
sub insert {
- my $self=shift;
- croak "no template file specified" unless (defined $self -> {file});
+ my $self = shift;
+ my $name = shift;
- my $name=shift;
+ croak "no template file specified"
+ unless (defined $self -> {file});
- # Rueckgabe
+ # return
$self -> {metaon} . $name . $self -> {metaoff};
}
-################################
-# sub list
+### sub list ###################################################################
+#
+# fill in a complete list
+#
+# Params: $name - name of the atomic scrap
+# $array - list of hashes (same strcuture like the hash used by 'scrap')
+#
+# Return: scalar reference - filled in list
#
-# komplette Liste einsetzen
-################################
-
sub list {
- my $self=shift;
- my $name=shift;
+ my $self = shift;
+ my $name = shift;
- croak "no template file specified" unless (defined $self->{file});
+ croak "no template file specified"
+ unless (defined $self -> {file});
- my $list = join '', map { ${ $self -> scrap ($name, $_) } } @{ +shift };
+# no warnings 'uninitialized';
+ my $list = join '' => map { ${ $self -> scrap ($name, $_) } } @{ +shift };
- # Rueckgabe
+ # return
\$list;
}
-################################
-# sub scrap
+### sub scrap ##################################################################
+#
+# fill in a template scrap
+#
+# Params: $name name of the scrap
+# ...
+# $no_nl 1 - remove newlines (\n)
+# 0 - do no such thing
+#
+# Return: scalar reference - filled in scrap
#
-# Schnipsel ausfuellen
-################################
-
sub scrap {
- my $self=shift;
- my $name=shift;
+ my $self = shift;
+ my $name = shift;
- croak "no template file specified" unless (defined $self->{file});
+ my $no_nl;
+ if (!ref $_[$#_]) {
+ $no_nl = pop @_;
+ }
- my %params;
+ croak "no template file specified"
+ unless (defined $self -> {file});
- # Parameter holen
- # Als Values werden nur die Referenzen gespeichert
- %params = map { my $ref = $_; map { ($_ => ( (ref ($ref -> {$_} ) )?$ref -> {$_}: \($ref -> {$_} ) ) ) } keys %$ref } splice @_;
+ return \'' unless (defined $name and defined ($self -> {parsed} -> {$name}));
- # und einsetzen
- my $scrap=$self->{parsed}->{$name};
- my $qmon=quotemeta $self->{metaon};
- my $qmoff=quotemeta $self->{metaoff};
+ # fetch parameters
+ # (and normalize - save only the references in %params)
+ #
+ my %params;
+ %params = map {
+ my $ref = $_;
+ map {
+ ($_ => (
+ ref ($ref -> {$_})
+ ? (defined ${$ref -> {$_}} ? $ref -> {$_} : \'')
+ : \(defined $ref -> {$_} ? $ref -> {$_} : ''))
+ )
+ } keys %$ref
+ } splice @_;
+
+ # fill in...
+ #
+ my $scrap = $self -> {parsed} -> {$name};
+ my $qmon = quotemeta $self -> {metaon};
+ my $qmoff = quotemeta $self -> {metaoff};
- # und zwar solange, bis nichts mehr da ist
- while ($scrap =~ s<$qmon\s*([_a-zA-Z]\S*)\s*$qmoff>[
- my $x='';
- if ( exists ( $params{$1} ) ) { $x = ${$params{$1}} }
- elsif (exists ( $self -> {parsed} -> {$1} ) ) { $x = $self -> {parsed} -> {$1}}
- $x;]geo ){};
+ # ...until we've replaced all placeholders
+ #
+ 1 while (
+ $scrap =~ s
+ <
+ $qmon \s*
+ ([_a-zA-Z] \S*)
+ \s* $qmoff
+ >
+ [ (exists ( $params{$1} ) )
+ ? ${$params{$1}}
+ : ( exists ( $self -> {parsed} -> {$1} )
+ ? $self -> {parsed} -> {$1}
+ : ''
+ );
+ ]gex
+ );
+
+ # parse conditional blocks
+ #
+ $self -> parse_if (
+ \$scrap,
+ \%params
+ );
- $self -> parse_if (\$scrap,\%params);
+ # remove newlines
+ #
+ $scrap =~ s/\015\012|\015|\012//g if ($no_nl);
- # Rueckgabe
+ # return
\$scrap;
}
-# ====================================================
-# Private Funktionen/Methoden
-# ====================================================
-
-################################
-# sub parse_file
+### sub parse_file #############################################################
+#
+# read in and parse template file
+#
+# Params: ~none~
+#
+# Return: Status Code (Boolean)
#
-# Template einlesen & parsen
-################################
-
sub parse_file {
my $self = shift;
+ my $filename = $self -> {file};
- if (-f $self -> {file}) {
- my $filename = $self -> {file};
+ if ($xml_dom_used) {
+
+ # parse template using XML::DOM
+ #
my $xml = eval {
local $SIG{__DIE__};
new XML::DOM::Parser -> parsefile ($filename);
};
- croak "error in template file '$filename': $@" if ($@);
+ croak "error while parsing template file '$filename': $@" if ($@);
my $template = $xml -> getElementsByTagName ('Template', 0) -> item (0);
- # Metas bestimmen
+ # extract meta delimiters
+ #
$self -> {metaon} = $template -> getAttribute ('metaon');
$self -> {metaoff} = $template -> getAttribute ('metaoff');
$self -> {parsed} -> {$name} = $_ -> getFirstChild -> getData;
$self -> {parsed} -> {$name} =~ s/^\s+|\s+$//g;}
- return 1; # alles klar
+ return 1; # looks fine
}
+ else {
+ # XML::DOM not available...
+ # parse the template using both hands ;)
+ #
+
+ my ($xml, $root, $template);
+ local (*FILE, $/);
+
+ open FILE, "< $filename" or croak "error while reading template file '$filename': $!";
+ $xml = <FILE>;
+ close FILE or croak "error while closing template file '$filename' after reading: $!";
+
+ ($root, $template) = ($1, $2) if ($xml =~ m|(<Template\s+[^>"]*(?:"[^"]*"[^>"]*)*>)(.*)</Template\s*>|s);
+ croak "error while parsing template file '$filename': missing root element 'Template'"
+ unless (defined $root and defined $template);
+
+ # extract meta delimiters
+ #
+ $self -> {metaon} = $1 if ($root =~ /\smetaon\s*=\s*"([^"]+)"/);
+ $self -> {metaoff} = $1 if ($root =~ /\smetaoff\s*=\s*"([^"]+)"/);
+
+ croak "missing meta defintion(s) in template file '$filename'." unless ($self -> {metaon} and $self -> {metaoff});
+
+ # don't use any other entities than " ' < > and &
+ # (while using non XML::DOM - version)
+ #
+ for ('metaon', 'metaoff') {
+ $self -> {$_} =~ s/"/"/g; $self -> {$_} =~ s/'/'/g;
+ $self -> {$_} =~ s/</</g; $self -> {$_} =~ s/>/>/g;
+ $self -> {$_} =~ s/&/&/g;
+ }
- 0;
+ $self -> {parsed} = {};
+ while ($template =~ m|<Scrap\s+(?:id\s*=\s*"([^"]+)")?\s*>\s*<!\[CDATA\[([^\]]*(?:\](?!\]>)[^\]]*)*)\]\]>\s*</Scrap\s*>|g) {
+
+ my ($name, $content) = ($1, $2);
+
+ croak "Element 'Scrap' requires attribute 'id' in template file '$filename'"
+ unless (defined $name and length $name);
+
+ croak "double defined id '$name' in template file '$filename'"
+ if (exists ($self -> {parsed} -> {$name}));
+
+ croak "use '/^[_a-zA-Z]\\S*\$/' for 'Scrap'-ids in template file '$filename' (wrong: '$name')"
+ unless ($name =~ /^[_a-zA-Z]\S*$/);
+
+ $content =~ s/^\s+//; $content =~ s/\s+$//;
+ $self -> {parsed} -> {$name} = $content;
+ }
+
+ return 1; # looks fine
+ }
+
+ return; # anything failed (??)
}
-################################
-# sub parse_if
+### sub parse_if ###############################################################
+#
+# parse conditional blocks
+#
+# Params: $scrap - scalar reference of the template scrap
+# $params - hash reference: values from the application
+#
+# Return: ~none~, ($$scrap will be modified)
#
-# %IF - Anweisungen parsen
-################################
-
sub parse_if {
my $self = shift;
my ($scrap, $params) = @_;
my $qmon = quotemeta $self -> {metaon};
my $qmoff = quotemeta $self -> {metaoff};
- # der folgende Regex ist ein bisschen fies ...
- # ... aber er funktioniert :-)
- #
- # pfff - rekursive Strukturen iterativ parsen ist nicht wirklich witzig
- #
+ # the following regex is just not optimized,
+ # but it works ;)
1 while ($$scrap =~ s {
- ($qmon\s*%(?:IF|ELSE)\s+.+?\s*$qmoff.*?) # Wenn IF oder ELSE von
- (?=$qmon\s*%IF\s+.+?\s*$qmoff) # IF gefolgt werden, soll
- # dieses Stueck uebersprungen
- # werden und erstmal mit der
- # naechsten Ebene weitergemacht
- # werden.
-
- |( # hier beginnt $2
- $qmon\s*%IF\s+(.+?)\s*$qmoff # IF
+ ($qmon\s*%(?:IF|ELSE)\s+.+?\s*$qmoff.*?) # skip this part
+ (?=$qmon\s*%IF\s+.+?\s*$qmoff) # if %IF or %ELSE are followed by %IF
+
+ |( # $2 starts here
+ $qmon\s*%IF\s+(.+?)\s*$qmoff # %IF
(.*?) # $4
(?:
- $qmon\s*%ENDIF\s*$qmoff # gefolgt von ENDIF
- | # oder
- $qmon\s*%ELSE\s*$qmoff # von ELSE... ($4 ELSE $5)
- (.*?)
- $qmon\s*%ENDIF\s*$qmoff # und ENDIF
+ $qmon\s*%ENDIF\s*$qmoff # followed by %ENDIF
+ | # or
+ $qmon\s*%ELSE\s*$qmoff # %ELSE...
+ (.*?) # $5
+ $qmon\s*%ENDIF\s*$qmoff # ...and ENDIF
)
)
}
for (split /\s+/,$t3) {
next unless (
exists($params->{$_})
+ and defined ${$params->{$_}}
and length ${$params->{$_}}
);
}
$ret;
- }gosex);
+ }gsex);
return;
}
-# keep require happy
+# keep 'require' happy
1;
#
#
-### end of Template ############################################################
+### end of Template ############################################################
\ No newline at end of file
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