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meta-language-iterators-csv-iterator.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Diggernaut: Documentation for Meta-Language | Iterators | CSV Iterator</title>
<meta name="description" content="How are the argument sets for iterations are formed from data provided in CSV format.">
<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, iterators, csv">
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<link rel="alternate" hreflang="en" href="https://www.diggernaut.com/dev/meta-language-iterators-csv-iterator.html"/>
<link rel="alternate" hreflang="ru" href="https://www.diggernaut.ru/dev/meta-yazyk-iteratory-csv-iterator.html"/>
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<main>
<div class="lessons-container" id="main">
<div class="container">
<h1>Iterators</h1>
<div>
<h2>CSV Iterator</h2>
<p class="flow-text">
<span class = "hlt2">CSV</span> iterators are used in cases when some argument has multiple values and you need to iterate for each value separately.
The Digger itself will parse the passed CSV values and create a list of argument sets. The following parameters are used to initialize the iterator:
</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 class="centered">type</td>
<td>The constant defining type of iterator, has value <span class="hlt2">csv</span>.</td>
</tr>
<tr>
<td>name</td>
<td>Name of argument.</td>
</tr>
<tr>
<td>value</td>
<td>Values of arguments in CSV format (set of values, comma separated).</td>
</tr>
</tbody>
</table>
<p class="flow-text">
The following is an example of initializing an iterator:
</p>
<div class="row">
<div class="col s12">
<pre class="language-yaml">
<code class="language-yaml">iterator:
- type: csv
# ARGUMENT NAME
name: age
# ARGUMENT VALUES
value: 1,2,3,4
</code></pre>
</div>
</div>
<p class="flow-text">
As a result, the following list of sets of fields with values will be formed for each of which the digger will execute the main logic block:
</p>
<div class="row">
<div class="col s12">
<pre class="language-json">
<code class="language-json">[
{ "age": 1 },
{ "age": 2 },
{ "age": 3 },
{ "age": 4 }
]
</code></pre>
</div>
</div>
<p class="flow-text">
An example of using an iterator in a digger:
</p>
<div class="row">
<div class="col s12">
<ul class="tabs excdark">
<li class="tab col s4"><a class="active" href="#config">Digger configuration</a></li>
<li class="tab col s4"><a href="#log">Execution log</a></li>
</ul>
</div>
<div id="config" class="col s12">
<pre class="language-yaml">
<code class="language-yaml">---
config:
debug: 2
agent: Firefox
iterator:
type: csv
name: age
value: 18,19,25
do:
- walk:
to: https://www.diggernaut.com/sandbox/meta-lang-object-en.html?age=<%age%>
do:
</code></pre>
</div>
<div id="log" class="col s12">
<table id="datatable_logs" class="striped responsive-table debug-log" role="grid" aria-describedby="datatable_logs_info">
<thead>
<tr role="row">
<th class="sorting_desc" tabindex="0" aria-controls="datatable_logs" rowspan="1" colspan="1" aria-label="Time: activate to sort column ascending" aria-sort="descending" width="11%">Time</th>
<th class="sorting" tabindex="0" aria-controls="datatable_logs" rowspan="1" colspan="1" aria-label="Level: activate to sort column ascending" width="4%">Level</th>
<th class="word-wrapper sorting_disabled" rowspan="1" colspan="1" aria-label="Message">Message</th>
</tr>
</thead>
<tbody>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-23 15:09:19:464</td>
<td>info</td>
<td class=" word-wrapper">Scrape is done</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-23 15:09:19:449</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Page content: <!DOCTYPE html><html lang="en"><head>
<meta charset="UTF-8"/>
<title>Diggernaut | Meta-language | Object sample</title>
</head>
<body>
<h1>Title-1</h1>
<p>Lorem ipsum dolor sit amet.</p>
</body></html>
</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-23 15:09:19:422</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Referers: Referer: https://www.diggernaut.com/sandbox/meta-lang-object-en.html?age=19
</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-23 15:09:19:413</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Referer: https://www.diggernaut.com/sandbox/meta-lang-object-en.html?age=19</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-23 15:09:19:405</td>
<td>info</td>
<td class=" word-wrapper">Retrieving page (GET): https://www.diggernaut.com/sandbox/meta-lang-object-en.html?age=<span class="hlt2">25</span></td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-23 15:09:19:390</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Page content: <!DOCTYPE html><html lang="en"><head>
<meta charset="UTF-8"/>
<title>Diggernaut | Meta-language | Object sample</title>
</head>
<body>
<h1>Title-1</h1>
<p>Lorem ipsum dolor sit amet.</p>
</body></html>
</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-23 15:09:19:364</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Referers: Referer: https://www.diggernaut.com/sandbox/meta-lang-object-en.html?age=18
</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-23 15:09:19:353</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Referer: https://www.diggernaut.com/sandbox/meta-lang-object-en.html?age=18</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-23 15:09:19:345</td>
<td>info</td>
<td class=" word-wrapper">Retrieving page (GET): https://www.diggernaut.com/sandbox/meta-lang-object-en.html?age=<span class="hlt2">19</span></td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-23 15:09:19:332</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Page content: <!DOCTYPE html><html lang="en"><head>
<meta charset="UTF-8"/>
<title>Diggernaut | Meta-language | Object sample</title>
</head>
<body>
<h1>Title-1</h1>
<p>Lorem ipsum dolor sit amet.</p>
</body></html>
</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-23 15:09:18:944</td>
<td>info</td>
<td class=" word-wrapper">Retrieving page (GET): https://www.diggernaut.com/sandbox/meta-lang-object-en.html?age=<span class="hlt2">18</span></td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-23 15:09:18:935</td>
<td>info</td>
<td class=" word-wrapper">Starting scrape</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-23 15:09:18:914</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Setting up default proxy</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-23 15:09:18:900</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Setting up surf</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-23 15:09:18:867</td>
<td>info</td>
<td class=" word-wrapper">Starting digger: meta-lang-iterator-csv [1860]</td>
</tr>
</tbody>
</table>
</div>
</div>
<p class="flow-text">
You can use a combination of iterators to create a list with all possible combinations of arguments from different iterators.
</p>
<p class="flow-text">
An example of using a combination of iterators in a digger:
</p>
<div class="row">
<div class="col s12">
<ul class="tabs excdark">
<li class="tab col s4"><a class="active" href="#config2">Digger configuration</a></li>
<li class="tab col s4"><a href="#log2">Execution log</a></li>
</ul>
</div>
<div id="config2" class="col s12">
<pre class="language-yaml">
<code class="language-yaml">---
config:
debug: 2
agent: Firefox
iterator:
# by dates
- type: date
start: '2017-10-01'
period: 2
interval: 1
template: '%Y-%m-%d'
# and ages
- type: csv
name: age
value: 30,40
do:
- walk:
to: https://www.diggernaut.com/sandbox/meta-lang-object-en.html?age=<%age%>&from=<%start_date%>
do:
</code></pre>
</div>
<div id="log2" class="col s12">
<table class="striped responsive-table debug-log" role="grid" aria-describedby="datatable_logs_info">
<thead>
<tr role="row">
<th class="sorting_desc" tabindex="0" aria-controls="datatable_logs" rowspan="1" colspan="1" aria-label="Time: activate to sort column ascending" aria-sort="descending" width="11%">Time</th>
<th class="sorting" tabindex="0" aria-controls="datatable_logs" rowspan="1" colspan="1" aria-label="Level: activate to sort column ascending" width="4%">Level</th>
<th class="word-wrapper sorting_disabled" rowspan="1" colspan="1" aria-label="Message">Message</th>
</tr>
</thead>
<tbody>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-23 15:36:56:946</td>
<td>info</td>
<td class=" word-wrapper">Scrape is done</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-23 15:36:56:932</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Page content: <!DOCTYPE html><html lang="en"><head>
<meta charset="UTF-8"/>
<title>Diggernaut | Meta-language | Object sample</title>
</head>
<body>
<h1>Title-1</h1>
<p>Lorem ipsum dolor sit amet.</p>
</body></html>
</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-23 15:36:56:903</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Referers: Referer: https://www.diggernaut.com/sandbox/meta-lang-object-en.html?age=30&from=2017-10-02
</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-23 15:36:56:894</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Referer: https://www.diggernaut.com/sandbox/meta-lang-object-en.html?age=30&from=2017-10-02</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-23 15:36:56:885</td>
<td>info</td>
<td class=" word-wrapper">Retrieving page (GET): https://www.diggernaut.com/sandbox/meta-lang-object-en.html?age=<span class="hlt2">40</span>&from=<span class="hlt2">2017-10-02</span></td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-23 15:36:56:871</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Page content: <!DOCTYPE html><html lang="en"><head>
<meta charset="UTF-8"/>
<title>Diggernaut | Meta-language | Object sample</title>
</head>
<body>
<h1>Title-1</h1>
<p>Lorem ipsum dolor sit amet.</p>
</body></html>
</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-23 15:36:56:844</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Referers: Referer: https://www.diggernaut.com/sandbox/meta-lang-object-en.html?age=40&from=2017-10-01
</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-23 15:36:56:836</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Referer: https://www.diggernaut.com/sandbox/meta-lang-object-en.html?age=40&from=2017-10-01</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-23 15:36:56:829</td>
<td>info</td>
<td class=" word-wrapper">Retrieving page (GET): https://www.diggernaut.com/sandbox/meta-lang-object-en.html?age=<span class="hlt2">30</span>&from=<span class="hlt2">2017-10-02</span></td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-23 15:36:56:817</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Page content: <!DOCTYPE html><html lang="en"><head>
<meta charset="UTF-8"/>
<title>Diggernaut | Meta-language | Object sample</title>
</head>
<body>
<h1>Title-1</h1>
<p>Lorem ipsum dolor sit amet.</p>
</body></html>
</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-23 15:36:56:792</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Referers: Referer: https://www.diggernaut.com/sandbox/meta-lang-object-en.html?age=30&from=2017-10-01
</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-23 15:36:56:784</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Referer: https://www.diggernaut.com/sandbox/meta-lang-object-en.html?age=30&from=2017-10-01</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-23 15:36:56:778</td>
<td>info</td>
<td class=" word-wrapper">Retrieving page (GET): https://www.diggernaut.com/sandbox/meta-lang-object-en.html?age=<span class="hlt2">40</span>&from=<span class="hlt2">2017-10-01</span></td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-23 15:36:56:766</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Page content: <!DOCTYPE html><html lang="en"><head>
<meta charset="UTF-8"/>
<title>Diggernaut | Meta-language | Object sample</title>
</head>
<body>
<h1>Title-1</h1>
<p>Lorem ipsum dolor sit amet.</p>
</body></html>
</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-23 15:36:56:311</td>
<td>info</td>
<td class=" word-wrapper">Retrieving page (GET): https://www.diggernaut.com/sandbox/meta-lang-object-en.html?age=<span class="hlt2">30</span>&from=<span class="hlt2">2017-10-01</span></td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-23 15:36:56:302</td>
<td>info</td>
<td class=" word-wrapper">Starting scrape</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-23 15:36:56:286</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Setting up default proxy</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-23 15:36:56:277</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Setting up surf</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-23 15:36:56:247</td>
<td>info</td>
<td class=" word-wrapper">Starting digger: meta-lang-iterator-combo [1861]</td>
</tr>
</tbody>
</table>
</div>
</div>
<p class="flow-text">
Next, we learn more about <span class="hlt2">fieldset</span> iterators.
</p>
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