Finds Change in URL Content¶ ↑
Scrapes, Remembers, Outputs Change in URL Content."
# where: Gemfile
gem 'html_radar'
# where: terminal
gem install html_radar
Given the following:
http://test.html = "
<html><body>
<p><a href='http://test.html'>Static</a></p>
</body></html>
"
url = "test.html"
css_selector = "a"
item_tag = "ul"
top_id = "_123_"
memory = ""
Then html_radar takes a memory...
memory = HtmlRadar.refresh(memory, url, css_selector, item_tag, top_id)
memory == "
<ul><a href='http://test.html'>Static</a></ul>
<center><a href='#_123_'>###</a></center>
<hr />
<!-- split_tag -->
"
Then html_radar shows change as current, because the past does not yet exist...
change = HtmlRadar.show(memory).to_s
change.scan("Static").present? #=> TRUE
memory.scan("Static").present? #=> TRUE
change == "
<ul><a href='http://test.html'>Static</a></ul>
<center><a href='#_123_'>###</a></center>
<hr />
"
Then html_radar shows no change, because the past is the same as he present...
memory = HtmlRadar.refresh(memory, url, css_selector, item_tag, top_id)
change = HtmlRadar.show(memory).to_s
change.scan("Static").present? #=> FALSE
memory.scan("Static").present? #=> TRUE
change == ""
memory == "
<!-- split_tag -->
<ul><a href='http://test.html'>Static</a></ul>
<center><a href='#_123_'>###</a></center>
<hr />
"
Then html_radar shows "Change", because it is added to the new_memory...
new_memory = "<a href="...">Change</a>"+memory
memory = HtmlRadar.refresh(new_memory, url, css_selector, item_tag, top_id)
memory_change = HtmlRadar.show(memory).to_s
memory_change.scan("Change").present? #=> TRUE
memory_change.scan("Static").present? #=> FALSE
momory.scan("Static").present? #=> TRUE
change == "
<ul><a href="...">Change</a></ul>
<center><a href='#_123_'>###</a></center>
<hr />
"
memory == "
<ul><a href="...">Change</a></ul>
<center><a href='#_123_'>###</a></center>
<hr />
<!-- split_tag -->
<ul><a href='http://test.html'>Static</a></ul>
<center><a href='#_123_'>###</a></center>
<hr />
"
MIT-LICENSE.
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