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<!DOCTYPE html>
<html lang="en">
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<title>Diggernaut: Documentation for Meta-Language | Methods for Entity Manipulations | Link Pools</title>
<meta name="description" content="Study the methods of working with a link pools.">
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<h1>Entity Manipulations</h1>
<div>
<h2>Link Pools</h2>
<p class="flow-text">
There are two commands for working with link pools, one used to add
link to a specific pool, another to clear a given pool.
</p>
<p class="flow-text">
The <span class = "hlt2">pool_clear</span> command clears the link pool with the given name.
If the name is not provided, the pool with the name "<strong>default</strong>" is cleared, which is the default pool.
</p>
<p class="flow-text">
The <span class = "hlt2">link_add</span> command adds a link to the pool. Depending on the context and used
parameters, you can add a link from the register or in an explicit form. For example, in a block context
you can add a link from the register, and in other contexts only explicitly, since the register
is not available in other contexts. The full list of parameters is given below:
</p>
<table class="responsive-table highlight">
<thead>
<tr>
<th data-field="parameter">Parameter</th>
<th data-field="description">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>pool</td>
<td>Pool name. If not sent, digger uses "<strong>default</strong>" as pool name.</td>
</tr>
<tr>
<td>url</td>
<td>One or list of links (see examples), given explicitly to add to the pool. If parameter is missing, register value is used as source to get link.</td>
</tr>
</tbody>
</table>
<p class="flow-text">
Usage examples:
</p>
<div class="row">
<div class="col s12">
<pre class="language-yaml">
<code class="language-yaml"># CREATE BLOCK FROM HTML STRING
- register_set: '<body>
<a href="http://www.somesite.com/1">link1</a>
<a href="http://www.somesite.com/2">link2</a>
<a href="http://www.somesite.com/3">link3</a>
<a href="http://www.somesite.com/4">link4</a>
</body>'
- to_block
# -------------------------------------------------------------
# FIND ALL `a` TAGS
- find:
path: a
do:
# READ `href` ATTRIBUTE TO THE REGISTER
- parse:
attr: href
# ADD LINK FROM REGISTER TO THE POOL (DEFAULT)
- link_add
# ITERATE OVER LINKS IN THE POOL, LOAD PAGE AND EXECUTE `do` BLOCK
- walk:
to: links
do:
...
...
# CLEAR POOL WITH NAME `default`
- pool_clear
# -------------------------------------------------------------
# FIND ALL `a` TAGS
- find:
path: a
do:
# READ `href` ATTRIBUTE TO THE REGISTER
- parse:
attr: href
# ADD LINK FROM REGISTER TO THE POOL WITH NAME `main`
- link_add:
pool: main
# ITERATE OVER LINKS IN THE POOL `main`, LOAD PAGE AND EXECUTE `do` BLOCK
- walk:
to: links
pool: main
do:
...
...
# CLEAR POOL WITH NAME main
- pool_clear: main
# -------------------------------------------------------------
# EXPLICITLY ADD URL http://www.somesite.com/somecoolurl TO THE POOL WITH NAME `somepool`
- link_add:
pool: somepool
url: http://www.somesite.com/somecoolurl
# -------------------------------------------------------------
# EXPLICITLY ADD LIST OF URLS TO THE POOL WITH NAME `somepool`
- link_add:
pool: somepool
url:
- http://www.somesite.com/somecoolurl1
- http://www.somesite.com/somecoolurl2
- http://www.somesite.com/somecoolurl3
- http://www.somesite.com/somecoolurl4
</code></pre>
</div>
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<p class="flow-text">
In the next chapter, we show you how to work with data objects.
</p>
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