# ------------------------------------------------------------------
# Petal::Hash::String - Interpolates variables with other strings
# ------------------------------------------------------------------
# Author: Jean-Michel Hiver
# This module is redistributed under the same license as Perl
# itself.
# ------------------------------------------------------------------
package Petal::Hash::String;
use strict;
use warnings;
use Carp;
our $VARIABLE_RE_SIMPLE = qq |\\\$[A-Za-z_][A-Za-z0-9_\\.:\/]+|;
our $VARIABLE_RE_BRACKETS = qq |\\\$(?<!\\\\)\\{.*?(?<!\\\\)\\}|;
our $TOKEN_RE = "(?:$VARIABLE_RE_SIMPLE|$VARIABLE_RE_BRACKETS)";
sub process
{
my $self = shift;
my $hash = shift;
my $argument = shift;
$Petal::TranslationService && do {
$argument = eval { $Petal::TranslationService->maketext ($argument) } || $argument;
$@ and warn $@;
};
my $tokens = $self->_tokenize (\$argument);
my @res = map {
($_ =~ /$TOKEN_RE/gsm) ?
do {
s/^\$//;
s/^\{//;
s/\}$//;
$hash->fetch ($_);
} :
do {
s/\\(.)/$1/gsm;
$_;
};
} @{$tokens};
return join '', map { defined $_ ? $_ : () } @res;
}
# $class->_tokenize ($data_ref);
# ------------------------------
# Returns the data to process as a list of tokens:
# ( 'some text', '<% a_tag %>', 'some more text', '<% end-a_tag %>' etc.
sub _tokenize
{
my $self = shift;
my $data_ref = shift;
my @tokens = $$data_ref =~ /($TOKEN_RE)/gs;
my @split = split /$TOKEN_RE/s, $$data_ref;
my $tokens = [];
while (@split)
{
push @{$tokens}, shift (@split);
push @{$tokens}, shift (@tokens) if (@tokens);
}
push @{$tokens}, (@tokens);
return $tokens;
}
1;
__END__