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package Parse::Constructor::Arguments; |
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our $VERSION = '0.091570'; |
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#ABSTRACT: Parse Moose constructor arguments using PPI |
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use Moose; |
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use PPI; |
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use MooseX::Types::Moose(':all'); |
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BEGIN |
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{ |
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*DEBUG = sub () { 0 } unless defined *DEBUG{CODE}; |
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} |
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has document => |
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( |
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is => 'ro', |
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isa => 'PPI::Document', |
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lazy_build => 1, |
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); |
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has current => |
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( |
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is => 'ro', |
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isa => 'PPI::Element', |
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lazy => 1, |
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builder => '_build_current', |
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writer => '_set_current', |
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); |
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has input => |
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( |
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is => 'ro', |
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isa => Str, |
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required => 1, |
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); |
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sub _build_current |
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{ |
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my $self = shift; |
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# our first token should be significant |
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my $token = $self->document->first_token; |
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if($token->significant) |
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{ |
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return $token; |
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} |
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while(1) |
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{ |
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$token = $token->next_token; |
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die "No more significant tokens in stream: '$token'" if not $token; |
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return $token if $token->significant; |
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} |
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} |
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sub _build_document |
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{ |
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my $self = shift; |
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my $input = $self->input; |
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my $document = PPI::Document->new(\$input); |
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return $document; |
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} |
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# states: |
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# 0 - Looking for a Word or Literal to use as a key |
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# 1 - Looking for a comma operator |
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# 2 - Looking for a value |
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sub parse |
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{ |
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my $class = shift; |
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my $str = shift; |
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my $self = $class->new(input => $str); |
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# grab the current token, which should be the first significant token |
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my $token = $self->current; |
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# what we are building |
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my %data; |
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# state related parsing variables |
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my $key; |
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my $state = 0; |
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while(1) |
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{ |
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if($state == 0) |
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{ |
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if($token->isa('PPI::Token::Word')) |
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{ |
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DEBUG && warn "Word Key: $token"; |
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$key = $token->content; |
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} |
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elsif($token->isa('PPI::Token::Quote::Single') or $token->isa('PPI::Token::Quote::Literal')) |
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{ |
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DEBUG && warn "Quote Key: $token"; |
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$key = $token->literal; |
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} |
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else |
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{ |
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die "Invalid state: Expected a Word or Literal but got '$token'"; |
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} |
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$state++; |
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} |
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elsif($state == 1) |
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{ |
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if($token->isa('PPI::Token::Operator') && $token->content =~ /,|=>/) |
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{ |
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DEBUG && warn "Comma: $token"; |
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} |
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else |
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{ |
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die "Invalid state: Expected a Comma operator, but got '$token'"; |
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} |
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$state++; |
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} |
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elsif($state == 2) |
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{ |
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if($token->isa('PPI::Token::Quote::Single') or $token->isa('PPI::Token::Quote::Literal')) |
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{ |
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DEBUG && warn "Quote Value: $token"; |
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$data{$key} = $token->literal; |
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} |
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elsif($token->isa('PPI::Token::Structure')) |
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{ |
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my $content = $token->content; |
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die "Unsupported structure '$content'" |
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if $content ne '[' and $content ne '{'; |
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DEBUG && warn 'Constructor: ' . $token->parent; |
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$data{$key} = $self->process; |
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} |
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elsif($token->isa('PPI::Token::Number')) |
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{ |
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DEBUG && warn "Number: $token"; |
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$data{$key} = $token->literal; |
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} |
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else |
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{ |
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die "Invalid state: Expected Literal, Number or Structure, but got '$token'"; |
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} |
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$state++; |
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$key = undef; |
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} |
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elsif($state == 3) |
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{ |
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if($token->isa('PPI::Token::Operator') && $token->content =~ /,|=>/) |
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{ |
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DEBUG && warn "Comma: $token"; |
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} |
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else |
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{ |
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die "Invalid state: Expected a Comma operator, but got '$token'"; |
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} |
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160
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$state = 0; |
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} |
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163
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if(my $t = $self->peek_next_token) |
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{ |
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DEBUG && warn "Peeked and took $t"; |
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$token = $t; |
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$self->_set_current($token); |
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} |
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else |
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{ |
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DEBUG && warn "Peeked and there were no more tokens"; |
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last; |
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} |
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} |
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176
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return \%data; |
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} |
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sub process |
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{ |
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my $self = shift; |
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my ($data, $applicator, $terminator, $word, $token); |
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184
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if($self->current->content eq '[') |
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{ |
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DEBUG && warn "Processing Array..."; |
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$data = []; |
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$terminator = ']'; |
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$applicator = sub { push(@{$_[0]}, $_[2]) }; |
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} |
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else |
192
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{ |
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DEBUG && warn "Processing Hash..."; |
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$data = {}; |
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$terminator = '}'; |
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$applicator = sub { $_[0]->{$_[1]} = $_[2] }; |
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} |
198
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199
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$token = $self->get_next_significant; |
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201
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while($token->content ne $terminator) |
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{ |
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# words are stored until we know if they are a key or a value |
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if($token->isa('PPI::Token::Word')) |
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{ |
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DEBUG && warn "Process Word: $token"; |
207
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$word = $token->content; |
208
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$token = $self->get_next_significant; |
209
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} |
210
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211
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if($token->isa('PPI::Token::Number')) |
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{ |
213
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DEBUG && warn "Process Number: $token"; |
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$applicator->($data, $word, $token->content); |
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$word = undef; |
216
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} |
217
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elsif($token->isa('PPI::Token::Structure')) |
218
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{ |
219
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DEBUG && warn "Process Structure: $token"; |
220
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$applicator->($data, $word, $self->process); |
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$word = undef; |
222
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} |
223
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elsif($token->isa('PPI::Token::Quote::Single') || $token->isa('PPI::Token::Quote::Literal')) |
224
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{ |
225
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DEBUG && warn "Process Quote: $token"; |
226
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if(!$word && $terminator eq '}') |
227
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{ |
228
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DEBUG && warn "Process Hash Key Quote: $token"; |
229
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$word = $token->literal; |
230
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$token = $self->get_next_significant; |
231
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next; |
232
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} |
233
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234
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$applicator->($data, $word, $token->literal); |
235
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$word = undef; |
236
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} |
237
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elsif($token->isa('PPI::Token::QuoteLike::Words') and $terminator ne '}') |
238
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{ |
239
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# This seems to be the only way to get the fuckin data from this token |
240
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# which is completely retarded. Need to file a bug with PPI on this |
241
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DEBUG && warn "Process QuoteLike Words: $token"; |
242
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243
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my $operator = $token->{operator}; |
244
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my $separator = $token->{separator}; |
245
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my $content = $token->content; |
246
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$content =~ s/$operator|$separator//g; |
247
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$applicator->($data, undef, $_) for split(' ', $content); |
249
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} |
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elsif($token->isa('PPI::Token::Operator')) |
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{ |
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DEBUG && warn "Process Comma: $token"; |
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if($token->content =~ /,|=>/) |
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{ |
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$token = $self->get_next_significant; |
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next; |
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} |
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} |
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# now we process our words if they haven't been consumed |
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DEBUG && warn "Process Add Word: $word" if $word; |
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$applicator->($data, undef, $word) if $word; |
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$word = undef; |
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$token = $self->get_next_significant; |
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} |
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DEBUG && warn "Returning From Processing"; |
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return $data; |
270
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} |
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sub get_next_significant |
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{ |
274
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my $self = shift; |
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my $token = $self->current; |
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DEBUG && warn "Current: $token"; |
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while(1) |
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{ |
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$token = $token->next_token; |
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die 'No more significant tokens in stream: '. $self->document if not $token; |
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283
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if(!$token->significant) |
284
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{ |
285
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next; |
286
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} |
287
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288
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DEBUG && warn "Significant: $token"; |
289
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$self->_set_current($token); |
290
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return $token; |
291
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} |
292
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} |
293
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294
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|
sub peek_next_token |
295
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|
{ |
296
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|
my $self = shift; |
297
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|
my $token = $self->current; |
298
|
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299
|
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|
|
while(1) |
300
|
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|
{ |
301
|
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|
|
$token = $token->next_token; |
302
|
|
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|
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|
|
return 0 if not $token; |
303
|
|
|
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|
|
return $token if $token->significant; |
304
|
|
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|
|
} |
305
|
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|
|
} |
306
|
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307
|
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|
|
|
|
__PACKAGE__->meta->make_immutable; |
308
|
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309
|
|
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|
|
1; |
310
|
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311
|
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312
|
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313
|
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|
|
=pod |
314
|
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|
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|
|
315
|
|
|
|
|
|
|
=head1 NAME |
316
|
|
|
|
|
|
|
|
317
|
|
|
|
|
|
|
Parse::Constructor::Arguments - Parse Moose constructor arguments using PPI |
318
|
|
|
|
|
|
|
|
319
|
|
|
|
|
|
|
=head1 VERSION |
320
|
|
|
|
|
|
|
|
321
|
|
|
|
|
|
|
version 0.091570 |
322
|
|
|
|
|
|
|
|
323
|
|
|
|
|
|
|
=head1 DESCRIPTION |
324
|
|
|
|
|
|
|
Parse::Constructor::Arguments parses Moose-style constructor arguments into a |
325
|
|
|
|
|
|
|
usable data structure using PPI to accomplish the task. It exports nothing |
326
|
|
|
|
|
|
|
and the only public method is a class method: parse. |
327
|
|
|
|
|
|
|
|
328
|
|
|
|
|
|
|
=head1 METHODS |
329
|
|
|
|
|
|
|
|
330
|
|
|
|
|
|
|
=head2 parse(ClassName $class: Str $str) |
331
|
|
|
|
|
|
|
|
332
|
|
|
|
|
|
|
This is a class method used for parsing constructor arguments. It takes a |
333
|
|
|
|
|
|
|
string that will be used as the basis of the PPI::Document. Returns a hashref |
334
|
|
|
|
|
|
|
where the keys are the named arguments and the values are the actual values to |
335
|
|
|
|
|
|
|
those named arguments. (eg. q|foo => ['bar']| returns { foo => ['bar'] }) |
336
|
|
|
|
|
|
|
|
337
|
|
|
|
|
|
|
=head1 AUTHOR |
338
|
|
|
|
|
|
|
|
339
|
|
|
|
|
|
|
Nicholas Perez <nperez@cpan.org> |
340
|
|
|
|
|
|
|
|
341
|
|
|
|
|
|
|
=head1 COPYRIGHT AND LICENSE |
342
|
|
|
|
|
|
|
|
343
|
|
|
|
|
|
|
This software is copyright (c) 2009 by Nicholas Perez. |
344
|
|
|
|
|
|
|
|
345
|
|
|
|
|
|
|
This is free software; you can redistribute it and/or modify it under |
346
|
|
|
|
|
|
|
the same terms as perl itself. |
347
|
|
|
|
|
|
|
|
348
|
|
|
|
|
|
|
=cut |
349
|
|
|
|
|
|
|
|
350
|
|
|
|
|
|
|
|
351
|
|
|
|
|
|
|
|
352
|
|
|
|
|
|
|
__END__ |