---
name: "Pandoc::Filter::Lazy"
section: "3pm"
platform: "linux"
package: "libpandoc-elements-perl"
version: "0.24-1"
release: "Debian 9 (Stretch)"
platforms: ["linux"]
url: "https://new.carta.tech/Pandoc::Filter::Lazy"
---

# Pandoc::Filter::Lazy(3pm)

facilitate creation of filters

## NAME

Pandoc::Filter::Lazy - facilitate creation of filters

## SYNOPSIS

```
  my $filter = Pandoc::Filter::Lazy->new(
      'Header => sub { Header $_->level, [ Str $_->string ] }'
  );
  if ( $filter->error ) {
      say STDERR $lazy->error;
      say STDERR $lazy->code;
  } else {
      $filter->apply(...)
  }
```

## DESCRIPTION

This module helps creation of Pandoc::Filter with arguments given as string. The following should result in equivalent filters:

```
  Pandoc::Walker::action( ... );     #  ...  as code
  Pandoc::Filter::Lazy->new( '...' ) # '...' as string
```

The script passed as only argument is tried to convert to valid Perl by escaping selectors and adding a missing `"sub { ... }""`, for instance

```
  Code|CodeBlock => say $_->class
```

Is converted to

```
  'Code|CodeBlock' => sub { say $_->class }
```

## METHODS

In addition to the methods inherited from Pandoc::Filter:

### error

Return an error message if compilation of the filter failed.

### script

Return the (possibly cleaned) script arguments to create the filter.

### code( \[ indent =\> $indent, \] \[ function =\> $function \] )

Return a string of Perl code that can be used to create the same filter.

## SEE ALSO

This module is used in command line scripts pandocwalk and pod2pandoc.