How to resolve the algorithm Web scraping step by step in the Lasso programming language

Published on 12 May 2024 09:40 PM
#Lasso

How to resolve the algorithm Web scraping step by step in the Lasso programming language

Table of Contents

Problem Statement

Create a program that downloads the time from this URL:   http://tycho.usno.navy.mil/cgi-bin/timer.pl   and then prints the current UTC time by extracting just the UTC time from the web page's HTML. Alternatively, if the above url is not working, grab the first date/time off this page's talk page.

If possible, only use libraries that come at no extra monetary cost with the programming language and that are widely available and popular such as CPAN for Perl or Boost for C++.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Web scraping step by step in the Lasso programming language

Source code in the lasso programming language

/* have to be used
local(raw_htmlstring = 'What time is it?

 US Naval Observatory Master Clock Time
 


Jul. 27, 22:57:22 UTC   Universal Time

Jul. 27, 06:57:22 PM EDT  Eastern Time

Jul. 27, 05:57:22 PM CDT  Central Time

Jul. 27, 04:57:22 PM MDT  Mountain Time

Jul. 27, 03:57:22 PM PDT  Pacific Time

Jul. 27, 02:57:22 PM AKDT Alaska Time

Jul. 27, 12:57:22 PM HAST Hawaii-Aleutian Time


')
*/

// should be used
local(raw_htmlstring = string(include_url('http://tycho.usno.navy.mil/cgi-bin/timer.pl')))

local(
  reg_exp = regexp(-find = `
(.*?) UTC`, -input = #raw_htmlstring, -ignorecase),
  datepart_txt =  #reg_exp -> find ? #reg_exp -> matchstring(1) | string
)

#datepart_txt
'
'
// added bonus showing how parsed string can be converted to date object
local(mydate = date(#datepart_txt, -format = `MMM'.' dd',' HH:mm:ss`))
#mydate -> format(`YYYY-MM-dd HH:mm:ss`)

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