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package Catmandu::Fix::substring;
use Catmandu::Sane;
use Moo;
use Catmandu::Fix::Has;
with 'Catmandu::Fix::Base';
has path => (fix_arg => 1);
has args => (fix_arg => 'collect');
sub emit {
my ($self, $fixer) = @_;
my $path = $fixer->split_path($self->path);
my $key = pop @$path;
my $args = $self->args;
my $str_args = @$args > 1 ? join(", ", @$args[0, 1]) : $args->[0];
$fixer->emit_walk_path($fixer->var, $path, sub {
my $var = shift;
$fixer->emit_get_key($var, $key, sub {
my $var = shift;
if (@$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} };"
."}";
});
});
}
=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
substring(initials, 0, 1)
=head1 SEE ALSO
L<Catmandu::Fix>, substr
=cut
1;
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