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StringScanner.pm
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100 lines (88 loc) · 1.55 KB
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package Utils::StringScanner;
use strict;
use warnings;
sub new {
my ($class, $string) = @_;
my %self = (str => $string);
return bless \%self, $class;
}
sub scan {
my ($self, $regex) = @_;
if (ref($regex) ne 'Regexp') {
$regex = quotemeta $regex;
}
if ($self->{str} =~ /^$regex/sx) {
return substr($self->{str}, 0, $+[0], '');
} else {
return;
}
}
sub scanUntil {
my ($self, $regex) = @_;
if (ref($regex) ne 'Regexp') {
$regex = quotemeta $regex;
}
if ($self->{str} =~ /$regex/sx) {
return substr($self->{str}, 0, $-[0], '');
} else {
return;
}
}
sub peek {
my ($self, $regex) = @_;
if (ref($regex) ne 'Regexp') {
$regex = quotemeta $regex;
}
if ($self->{str} =~ /^$regex/sx) {
return substr($self->{str}, 0, $+[0]);
} else {
return;
}
}
sub peekUntil {
my ($self, $regex) = @_;
if (ref($regex) ne 'Regexp') {
$regex = quotemeta $regex;
}
if ($self->{str} =~ /$regex/sx) {
return substr($self->{str}, 0, $-[0]);
} else {
return;
}
}
sub skip {
my ($self, $regex) = @_;
if (ref($regex) ne 'Regexp') {
$regex = quotemeta $regex;
}
if ($self->{str} =~ /^$regex/sx) {
substr($self->{str}, 0, $+[0], '');
return $+[0];
} else {
return;
}
}
sub skipUntil {
my ($self, $regex) = @_;
if (ref($regex) ne 'Regexp') {
$regex = quotemeta $regex;
}
if ($self->{str} =~ /$regex/sx) {
substr($self->{str}, 0, $-[0], '');
return $+[0];
} else {
return;
}
}
sub rest {
my ($self) = @_;
return $self->{str};
}
sub terminate {
$_[0]->{str} = '';
}
sub eos {
my ($self) = @_;
return length($self->{str}) == 0;
}
1;