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Operator Precedence Parser

by bart (Canon)
on Jun 09, 2006 at 15:39 UTC ( #554516=perlmeditation: print w/replies, xml ) Need Help??

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  1. or download this
    expr := value ( op value )*
    
  2. or download this
    sub parse_expr {
        my($value, @stack);
    ...
        $value = process(\@stack, $value);  # final processing
        return $value;
    }
    
  3. or download this
    value := '(' expr ')'
    
  4. or download this
    #!perl -w
    use strict;
    ...
    $_ = "20+3*a+10*-b-5*(3 +2)*5";
    $\ = "\n";
    print evaluate($_);
    
  5. or download this
    #!perl -w
    use strict;
    ...
    $_ = "20+3*a+10*-b-5*(3 +2)*5";
    $\ = "\n";
    print evaluate($_);
    
  6. or download this
    value := name '(' ( expr ( ',' expr ) * )? ')'
    

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Node Type: perlmeditation [id://554516]
Approved by Limbic~Region
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[stevieb]: shmem It's something I desired to have years ago, which is why I took over berrybrew. Cross-platform build/test automation locally, or over the network Test::BrewBuild
[shmem]: sounds good.
[shmem]: but I'm crumbling smaller stones. remember...
[stevieb]: I'm working on it to fatten it up and make it more reliant so I can finalize my Raspberry Pi automated build system for that software :) It's all well and fun, until I try to make it work with Windows lol
[shmem]: "debugging a program is more difficult than to write it in the first place. If you code your program as smart as you are, you are, by definition, too dumb to debug it."
[stevieb]: I literally laughed. That's good :) Perhaps I just need to go climb another mountain and forget about it

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