#line 1
##
# name: Pegex::Grammar
# abstract: Pegex Grammar Base Class
# author: Ingy döt Net <ingy@cpan.org>
# license: perl
# copyright: 2010, 2011, 2012
package Pegex::Grammar;
use Pegex::Mo;
# Grammar can be in text or tree form. Tree will be compiled from text.
# Grammar can also be stored in a file.
has file => ();
has text => (builder => 'make_text');
has tree => (builder => 'make_tree');
sub make_text {
my ($self) = @_;
my $filename = $self->file
or return '';
open TEXT, $filename
or die "Can't open '$filename' for input\n:$!";
return do {local $/; <TEXT>}
}
sub make_tree {
my ($self) = @_;
my $text = $self->text
or die "Can't create a '" . ref($self) .
"' grammar. No tree or text or file.";
require Pegex::Compiler;
return Pegex::Compiler->new->compile($text)->tree;
}
# This import is to support: perl -MPegex::Grammar::Module=compile
sub import {
goto &Pegex::Mo::import
unless ((caller))[1] =~ /^-e?$/ and @_ == 2 and $_[1] eq 'compile';
my $package = shift;
$package->compile_into_module();
exit;
}
sub compile_into_module {
my ($package) = @_;
my $grammar_file = $package->file;
open GRAMMAR, $grammar_file
or die "Can't open $grammar_file for input";
my $grammar_text = do {local $/; <GRAMMAR>};
close GRAMMAR;
my $module = $package;
$module =~ s!::!/!g;
$module = "$module.pm";
my $file = $INC{$module} or return;
require Pegex::Compiler;
my $perl = Pegex::Compiler->new->compile($grammar_text)->to_perl;
open IN, $file or die $!;
my $module_text = do {local $/; <IN>};
close IN;
$perl =~ s/^/ /gm;
$module_text =~ s/^(sub\s+make_tree\s*\{).*?(^\})/$1\n$perl$2/ms;
open OUT, '>', $file or die $!;
print OUT $module_text;
close OUT;
}
1;