package Catmandu::Fix::substring;
use Catmandu::Sane;
our $VERSION = '1.0304';
use Moo;
use namespace::clean;
use Catmandu::Fix::Has;
has path => (fix_arg => 1);
has args => (fix_arg => 'collect');
with 'Catmandu::Fix::SimpleGetValue';
sub emit_value {
my ($self, $var, $fixer) = @_;
my $args = $self->args;
my $str_args = @$args > 1 ? join(", ", @$args[0, 1]) : $args->[0];
if (@$args < 3) {
return
"eval { ${var} = substr(as_utf8(${var}), ${str_args}) } if is_value(${var});";
}
my $replace = $fixer->emit_string($args->[2]);
"if (is_value(${var})) {"
. "utf8::upgrade(${var});"
. "eval { substr(${var}, ${str_args}) = ${replace} };" . "}";
}
1;
__END__
=pod
=head1 NAME
Catmandu::Fix::substring - extract a substring out of the value of a field
=head1 SYNOPSIS
# Extract a substring out of the value of a field
# - Extact from 'initials' the characters at offset 0 (first character) with a length 3
substring(initials, 0, 3)
=head1 SEE ALSO
L<Catmandu::Fix>, substr
=cut