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For_More_Tools:
package Pegex::Input;
use Pegex::Base;
has string => ();
has stringref => ();
has file => ();
has handle => ();
has _buffer => ();
has _is_eof => 0;
has _is_open => 0;
has _is_close => 0;
# NOTE: Current implementation reads entire input into _buffer on open().
sub read {
my ($self) = @_;
die "Attempted Pegex::Input::read before open" if not $self->{_is_open};
die "Attempted Pegex::Input::read after EOF" if $self->{_is_eof};
my $buffer = $self->{_buffer};
$self->{_buffer} = undef;
$self->{_is_eof} = 1;
return $buffer;
}
sub open {
my ($self) = @_;
die "Attempted to reopen Pegex::Input object"
if $self->{_is_open} or $self->{_is_close};
if (my $ref = $self->{stringref}) {
$self->{_buffer} = $ref;
}
elsif (my $handle = $self->{handle}) {
$self->{_buffer} = \ do { local $/; <$handle> };
}
elsif (my $path = $self->{file}) {
open my $handle, $path
or die "Pegex::Input can't open $path for input:\n$!";
$self->{_buffer} = \ do { local $/; <$handle> };
}
elsif (exists $self->{string}) {
$self->{_buffer} = \$self->{string};
}
else {
die "Pegex::Input::open failed. No source to open";
}
$self->{_is_open} = 1;
return $self;
}
sub close {
my ($self) = @_;
die "Attempted to close an unopen Pegex::Input object"
if $self->{_is_close};
close $self->{handle} if $self->{handle};
$self->{_is_open} = 0;
$self->{_is_close} = 1;
$self->{_buffer} = undef;
return $self;
}
1;