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package Sub::Lambda::Grammar; |
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use warnings; |
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use strict; |
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use Parse::RecDescent; |
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use base qw(Exporter); |
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our @EXPORT_OK = qw(parse); |
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my $grammar = q{ |
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Parse : /^/ Expression /$/ { $item[2] } |
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Expression : Unit(s) |
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{ (join "->", map {qq(($_))} @{$item[1]}) } |
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Unit : Code | Lambda | Parens | Symbol |
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Parens : '(' Expression ')' { $item[2] } |
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Lambda : /[\\\\]/ Pattern /\-\>/ Expression |
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{ qq( sub { my $item[2] = \@_; $item[4] } ) } |
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Pattern : (PWords | Words) { qq(($item[1])) } |
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Symbol : DWord | Word |
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Code : '{' Block(s?) '}' |
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{ my $x = join ' ', @{$item[2]}; "do {$x}" } |
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NoBlock : /[^{}]+/ |
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Block : NoBlock | '{' Block(s?) '}' |
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{ my $x = join ' ', @{$item[2]}; "{$x}" } |
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PWords : '(' Words ')' { $item[2] } |
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Words : DWord | MWords |
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MWords : Word(s) DWord(?) { join ',', @{$item[1]}, @{$item[2]} } |
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Word : /[a-zA-Z]\w*/ { '$' . $item[1] } |
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DWord : '-' Word { '@' . substr($item[2],1) } |
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}; |
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our $parser = new Parse::RecDescent($grammar); |
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=head1 NAME |
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Sub::Lambda::Grammar |
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=head1 DESCRIPTION |
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Defines the lambda grammar for L. |
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=head2 METHODS |
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=over |
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=item parse($string) |
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Runs a L parser on its in put with a grammar defined in this |
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module. In effect, translates embedded lambda expressions to Perl code. |
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=cut |
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sub parse ($) { $parser->Parse($_[0]) } |
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1; |
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__END__ |