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#!/usr/bin/perl |
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use strict; |
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use warnings; |
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# Used in our AST to keep things simple; represents the concatenation of text and other stuff. |
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# Making this a many-dimensional operator, so that we avoid going too far down the callstack rabbithole. |
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package WWW::Shopify::Liquid::Operator::Concatenate; |
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use base 'WWW::Shopify::Liquid::Operator'; |
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use Scalar::Util qw(blessed); |
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sub symbol { return ('~'); } |
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sub arity { return "nary"; } |
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sub priority { return 9; } |
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sub operate { |
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my ($self, $hash, $action, @ops) = @_; |
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$ops[$_] = '' for (grep { !defined $ops[$_] } 0..$#ops); |
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return join("", grep { defined $_ } @ops); |
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} |
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sub process { |
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my ($self, $hash, $action, $pipeline) = @_; |
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my @ops = @{$self->{operands}}; |
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for my $idx (0..$#ops) { |
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eval { |
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$ops[$idx] = $ops[$idx]->$action($pipeline, $hash) unless $self->is_processed($ops[$idx]); |
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$self->{operands}->[$idx] = $ops[$idx] if $action eq "optimize"; |
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}; |
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if (my $exp = $@) { |
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$exp->initial_render(@ops[0..($idx-1)]) if $idx > 0 && defined $exp && blessed($exp) && $exp->isa('WWW::Shopify::Liquid::Exception::Control'); |
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die $exp; |
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} |
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} |
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if (int(grep { !$self->is_processed($_) } @ops) > 0 && $action eq "optimize") { |
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my $result; |
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my @new_ops; |
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for (map { blessed($_) && $_->isa('WWW::Shopify::Liquid::Operator::Concatenate') ? (@{$_->{operands}}) : ($_) } @ops) { |
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if ($self->is_processed($_)) { |
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$result .= $_ if defined $_; |
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} else { |
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push(@new_ops, $result); |
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$result = ''; |
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push(@new_ops, $_); |
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} |
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} |
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push(@new_ops, $result) if $result ne ''; |
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$self->{operands} = \@new_ops; |
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return $self; |
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} |
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return $self->operate($hash, $action, @ops); |
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} |
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sub optimize { |
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my ($self, $optimizer, $hash) = @_; |
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my $result = $self->SUPER::optimize($optimizer, $hash); |
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$self->{operands} = [grep { !$self->is_processed($_) || (defined $_ && $_ ne '') } @{$self->{operands}}]; |
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return $self->{operands}->[0] if int(@{$self->{operands}}) == 1; |
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return $result; |
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} |
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sub new { |
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my $package = shift; |
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my $line = shift; |
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my $core = shift; |
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my $self = bless { line => $line, core => $core, operands => undef }, $package; |
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$self->{operands} = [@_] if int(@_) >= 1; |
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return $self; |
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} |
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1; |