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package PERLANCAR::Parse::Arithmetic::Pegex; |
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our $DATE = '2016-06-18'; # DATE |
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our $VERSION = '0.004'; # VERSION |
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use 5.010001; |
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use strict; |
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use warnings; |
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use Pegex; |
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8886
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use Exporter qw(import); |
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our @EXPORT_OK = qw(parse_arithmetic); |
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my $grammar = <<'...'; |
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# Precedence Climbing grammar: |
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expr: add-sub |
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add-sub: mul-div+ % /- ( [ '+-' ])/ |
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mul-div: power+ % /- ([ '*/' ])/ |
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power: token+ % /- '**' / |
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token: /- '(' -/ expr /- ')'/ | number |
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number: /- ( '-'? DIGIT+ '.'? DIGIT* )/ |
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... |
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{ |
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package |
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Calculator; |
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use base 'Pegex::Tree'; |
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sub gotrule { |
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65492
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my ($self, $list) = @_; |
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return $list unless ref $list; |
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# Right associative: |
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100
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if ($self->rule eq 'power') { |
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while (@$list > 1) { |
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my ($a, $b) = splice(@$list, -2, 2); |
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push @$list, $a ** $b; |
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} |
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} |
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# Left associative: |
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else { |
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while (@$list > 1) { |
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my ($a, $op, $b) = splice(@$list, 0, 3); |
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0
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unshift @$list, |
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100
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($op eq '+') ? ($a + $b) : |
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($op eq '-') ? ($a - $b) : |
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($op eq '*') ? ($a * $b) : |
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($op eq '/') ? ($a / $b) : |
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die; |
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} |
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} |
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return @$list; |
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} |
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} |
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57
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sub parse_arithmetic { |
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3
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3
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1
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1251
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pegex($grammar, 'Calculator')->parse($_[0]); |
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} |
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1; |
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# ABSTRACT: Parse arithmetic expression (Pegex version) |
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__END__ |