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<!DOCTYPE html>
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<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Diggernaut: Documentation for Meta-Language | Methods for Entity Manipulations | Counters</title>
<meta name="description" content="In this chapter, you will learn how to work with counters and use them in different situations.">
<meta name="keywords" content="Diggernaut, scraping, web scraping, scraper, web scraper, meta-language, make scraper, scraper for websites, learning to scrape, data acquisition, create scraper, online scraper, content scraper, scraper for shop, scraper for classifieds, coding scraper, entity manipulation, counters">
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<h1>Entity Manipulations</h1>
<div>
<h2>Counters</h2>
<p class="flow-text">
Counters can be useful in situations when you need to count certain events.
For example, to count the number of iterations of the <span class = "hlt2">walk</span> command in <span class = "hlt">repeat</span> mode.
Counters can be used for values substitution, so you can use them to solve pagination tasks,
and not only to use it as page number, but also as record number, because you can increase (or decrease) value of counter by any integer number.
</p>
<p class="flow-text">
Before using the counter, you can initialize it with any integer value
using <span class = "hlt2">counter_set</span> command. If the counter has not been initialized explicitly, it will be set to <strong>0</strong> when
digger execute one of the following commands: <span class = "hlt2">counter_get</span>, <span class = "hlt2">counter_increment</span> or <span class = "hlt2">counter_decrement</span>.
</p>
<p class="flow-text">
All methods supposed to work with counters, with the exception of <span class = "hlt2">counter_get</span>
(only works in a block context), can be used in all contexts.
</p>
<p class="flow-text">
Let's overview the usage of counters in more details on examples:
</p>
<div class="row">
<div class="col s12">
<ul class="tabs excdark">
<li class="tab col s2"><a class="active" href="#counter_set">set</a></li>
<li class="tab col s2"><a href="#counter_get">get</a></li>
<li class="tab col s2"><a href="#counter_increment">increment</a></li>
<li class="tab col s2"><a href="#counter_decrement">decrement</a></li>
<li class="tab col s2"><a href="#counter_reset">reset</a></li>
</ul>
</div>
<div id="counter_set" class="col s12">
<pre class="language-yaml">
<code class="language-yaml"># CREATE BLOCK FROM HTML STRING
- register_set: '<div>123</div>'
- to_block
- find:
path: div
do:
# PARSE TO THE REGISTER
- parse
# INITIALIZE COUNTER `somecounter` WITH VALUE OF THE REGISTER (123)
- counter_set: somecounter
# COUNTER VALUE: 123
# ------------------------------------------------------
# SET REGISTER TO SOME INTEGER VALUE
- register_set: 456
# INITIALIZE COUNTER `somecounter` WITH VALUE OF THE REGISTER (456)
- counter_set: somecounter
# COUNTER VALUE: 456
# ------------------------------------------------------
# INITIALIZE COUNTER `somecounter` DIRECTLY
- counter_set:
name: somecounter
value: 100
# COUNTER VALUE: 100
</code></pre>
</div>
<div id="counter_get" class="col s12">
<pre class="language-yaml">
<code class="language-yaml"># CREATE BLOCK FROM HTML STRING
- register_set: '<div>232</div><p>block</p>'
- to_block
- find:
path: div
do:
# PARSE TO THE REGISTER
- parse
# SET COUNTER WITH NAME `somecounter` WITH VALUE OF THE REGISTER
- counter_set: somecounter
# COUNTER VALUE: 232
- find:
path: p
do:
# READ COUNTER `somecounter` VALUE TO THE REGISTER
- counter_get: somecounter
# REGISTER VALUE: 232
# YOU CAN ALSO USE COUNTERS FOR VALUES SUBSTITUTION, EG WHEN YOU USE register_set COMMAND:
- register_set: <%somecounter%> persons
# REGISTER VALUE: 232 persons
</code></pre>
</div>
<div id="counter_increment" class="col s12">
<pre class="language-yaml">
<code class="language-yaml"># CREATE BLOCK FROM HTML STRING
- register_set: '<div>232</div><p>block</p>'
- to_block
- find:
path: div
do:
# PARSE TO THE REGISTER
- parse
# REGISTER VALUE: 232
- counter_set: somecounter
# COUNTER VALUE: 232
- find:
path: p
do:
# INCREMENT COUNTER BY 1
- counter_increment:
name: somecounter
# COUNTER VALUE: 233
# INCREMENT COUNTER BY 24
- counter_increment:
name: somecounter
by: 24
# COUNTER VALUE: 257
</code></pre>
</div>
<div id="counter_decrement" class="col s12">
<pre class="language-yaml">
<code class="language-yaml"># CREATE BLOCK FROM HTML STRING
- register_set: '<div>232</div><p>block</p>'
- to_block
- find:
path: div
do:
# PARSE TO THE REGISTER
- parse
# INITIALIZE COUNTER `somecounter` WITH THE VALUE OF THE REGISTER
- counter_set: somecounter
# COUNTER VALUE: 232
- find:
path: p
do:
# DECREMENT COUNTER BY 1
- counter_decrement:
name: somecounter
# COUNTER VALUE: 231
# DECREMENT COUNTER BY 24
- counter_decrement:
name: somecounter
by: 24
# COUNTER VALUE: 207
</code></pre>
</div>
<div id="counter_reset" class="col s12">
<pre class="language-yaml">
<code class="language-yaml"># CREATE BLOCK FROM HTML STRING
- register_set: '<div>232</div><p>block</p>'
- to_block
- find:
path: div
do:
# PARSE TO THE REGISTER
- parse
# INITIALIZE COUNTER `somecounter` WITH THE VALUE OF THE REGISTER
- counter_set: somecounter
# COUNTER VALUE: 232
- find:
path: p
do:
# RESET COUNTER
- counter_reset: somecounter
# COUNTER VALUE: 0
</code></pre>
</div>
</div>
<p class="flow-text">
In the next chapter, we'll see what methods can be used to work with the link pools.
</p>
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