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Re: Parsing a file with parentheses to build a hash

by choroba (Archbishop)
on Nov 14, 2014 at 09:57 UTC ( #1107188=note: print w/replies, xml ) Need Help??

in reply to Parsing a file with parentheses to build a hash

You can use the Marpa parser:
#!/usr/bin/perl use strict; use warnings; use Data::Dumper; use Marpa::R2; my $g = << '__G__'; lexeme default = latm => 1 :start ::= Hash :default ::= action => itself Hash ::= '(' Pairs ')' action => hash Pairs ::= Pair+ action => pairs Pair ::= '(' Key Value ')' action => pair Key ::= String Value ::= String | Pairs String ~ [^\s()]+ whitespace ~ [\s]+ :discard ~ whitespace __G__ my $grammar = 'Marpa::R2::Scanless::G'->new({ source => \$g }); my $input = '( (SECTION (Section_KEY Value1) (Another_KEY1 Value2) (KEY2 value3) (KEY3 Value4)) (NEW_SECTION (SUB_SECTION (KEY4 Value5)) (NEW_SUB_SECTION (KEY5 Value6) ) ) )'; my $recce = 'Marpa::R2::Scanless::R'->new({ grammar => $gram +mar, semantics_package => 'main +', }); $recce->read(\$input); print Dumper $recce->value; sub hash { $_[2] } sub pairs { shift; +{ map @$_, @_ } } sub pair { [ @_[2, 3] ] } sub itself { $_[1] }


$VAR1 = \{ 'SECTION' => { 'Section_KEY' => 'Value1', 'KEY2' => 'value3', 'Another_KEY1' => 'Value2', 'KEY3' => 'Value4' }, 'NEW_SECTION' => { 'NEW_SUB_SECTION' => { 'KEY5' => 'Value +6' }, 'SUB_SECTION' => { 'KEY4' => 'Value5' } } };
لսႽ ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

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Re^2: Parsing a file with parentheses to build a hash
by xcellsior (Novice) on Nov 14, 2014 at 16:40 UTC
    I can see you have used this module more than once. It looks like it uses the Parse::RecDescent module. I'm going to read up on this one now. I've started to poke into the file structure now and see that it's not as cut and dry as I expected... I started to remember this as I reviewed my old code... ugggly. Anyway, I realized that I need to set up some matches for different keys because they actually have implied vars based on the key name. I'm guessing the module can handel this. I really want to learn this methodology since it seems much quicker to setup once I get my head wrapped around it. I'm going to drop a bit more of a real example.
      It looks like it uses the Parse::RecDescent module.
      No, it doesn't. It's an alternative to it.

      Also, you should consider using the <readmore> tag for the large data sample.

      لսႽ ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

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