Web scraping: Difference between revisions
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{{task|Networking and Web Interaction}}
[[Category:Input_Output]]
{{omit from|ACL2|Does not have network access.}}
{{omit from|Batch File|Does not have network access.}}
{{omit from|Locomotive Basic|Does not have network access.}}
{{omit from|Lotus 123 Macro Scripting}}
{{omit from|M4}}
{{omit from|Maxima}}
{{omit from|Openscad}}
{{omit from|PARI/GP}}
{{omit from|PostScript|no network access}}
{{omit from|Retro|Does not have network access.}}
{{omit from|ZX Spectrum Basic|Does not have network access.}}
;Task:
Create a program that downloads the time from this URL: [http://tycho.usno.navy.mil/cgi-bin/timer.pl 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.
<!-- As of March 2014, the page is available
{{task|Networking and Web Interaction}}
The page http://tycho.usno.navy.mil/cgi-bin/timer.pl is no longer available since July 2011.
The relevant part of that page source looked like this:
<pre>
...
<TITLE>What time is it?</TITLE>
<H2> US Naval Observatory Master Clock Time</H2> <H3><PRE>
<BR>Jul. 27, 22:57:22 UTC Universal Time
<BR>Jul. 27, 06:57:22 PM EDT Eastern Time
<BR>Jul. 27, 05:57:22 PM CDT Central Time
<BR>Jul. 27, 04:57:22 PM MDT Mountain Time
<BR>Jul. 27, 03:57:22 PM PDT Pacific Time
<BR>Jul. 27, 02:57:22 PM AKDT Alaska Time
<BR>Jul. 27, 12:57:22 PM HAST Hawaii-Aleutian Time
...
</pre>
End of comment -->
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 [http://www.cpan.org/ CPAN] for Perl or [[Boost]] for C++.
<br><br>
=={{header|8th}}==
<syntaxhighlight lang="forth">\ Web-scrape sample: get UTC time from the US Naval Observatory:
: read-url \ -- s
"http://tycho.usno.navy.mil/cgi-bin/timer.pl" net:get
not if "Could not connect" throw then
>s ;
: get-time
read-url
/<BR>.*?(\d{2}:\d{2}:\d{2})\sUTC/
tuck r:match if
1 r:@ . cr
then ;
get-time bye
</syntaxhighlight>
{{output}}
<pre>14:08:20</pre>
=={{header|Ada}}==
{{libheader|AWS}}
<syntaxhighlight lang="ada">with AWS.Client, AWS.Response, AWS.Resources, AWS.Messages;
with Ada.Text_IO, Ada.Strings.Fixed;
use Ada, AWS, AWS.Resources, AWS.Messages;
procedure Get_UTC_Time is
Page : Response.Data;
File : Resources.File_Type;
Buffer : String (1 .. 1024);
Position, Last : Natural := 0;
S : Messages.Status_Code;
begin
Page := Client.Get ("http://tycho.usno.navy.mil/cgi-bin/timer.pl");
S := Response.Status_Code (Page);
if S not in Success then
Text_IO.Put_Line
("Unable to retrieve data => Status Code :" & Image (S) &
" Reason :" & Reason_Phrase (S));
return;
end if;
Response.Message_Body (Page, File);
while not End_Of_File (File) loop
Resources.Get_Line (File, Buffer, Last);
Position :=
Strings.Fixed.Index
(Source => Buffer (Buffer'First .. Last),
Pattern => "UTC");
if Position > 0 then
Text_IO.Put_Line (Buffer (5 .. Position + 2));
return;
end if;
end loop;
end Get_UTC_Time;</syntaxhighlight>
=={{header|ALGOL 68}}==
{{works with|ALGOL 68|Revision 1 - however ''grep in string'', ''http content'' and ''str error'' are from a non-standard library}}
{{works with|ALGOL 68G|Any - tested with release [http://sourceforge.net/projects/algol68/files/algol68g/algol68g-1.18.0/algol68g-1.18.0-9h.tiny.el5.centos.fc11.i386.rpm/download 1.18.0-9h.tiny]}}
{{wont work with|ELLA ALGOL 68|Any (with appropriate job cards) - tested with release [http://sourceforge.net/projects/algol68/files/algol68toc/algol68toc-1.8.8d/algol68toc-1.8-8d.fc9.i386.rpm/download 1.8-8d] - due to extensive use of ''grep in string'' and ''http content''}}
<syntaxhighlight lang="algol68">STRING
domain="tycho.usno.navy.mil",
page="cgi-bin/timer.pl";
STRING # search for the needle in the haystack #
needle = "UTC",
hay stack = "http://"+domain+"/"+page,
re success="^HTTP/[0-9.]* 200",
re result description="^HTTP/[0-9.]* [0-9]+ [a-zA-Z ]*",
re doctype ="\s\s<![Dd][Oo][Cc][Tt][Yy][Pp][Ee] [^>]+>\s+";
PROC raise error = (STRING msg)VOID: ( put(stand error, (msg, new line)); stop);
PROC is html page = (REF STRING page) BOOL: (
BOOL out=grep in string(re success, page, NIL, NIL) = 0;
IF INT start, end;
grep in string(re result description, page, start, end) = 0
THEN
page:=page[end+1:];
IF grep in string(re doctype, page, start, end) = 0
THEN page:=page[start+2:]
ELSE raise error("unknown format retrieving page")
FI
ELSE raise error("unknown error retrieving page")
FI;
out
);
STRING reply;
INT rc = http content (reply, domain, haystack, 0);
IF rc = 0 AND is html page (reply)
THEN
STRING line; FILE freply; associate(freply, reply);
on logical file end(freply, (REF FILE freply)BOOL: (done; SKIP));
DO
get(freply,(line, new line));
IF string in string(needle, NIL, line) THEN print((line, new line)) FI
OD;
done: SKIP
ELSE raise error (strerror (rc))
FI</syntaxhighlight>
{{out}} Sample
<pre>
<BR>Sep. 26, 21:51:17 UTC Universal Time
</pre>
=={{header|App Inventor}}==
App Inventor has a Web component that contains code blocks which simplify Web scraping.<br>
It also has powerful text and list processing language blocks that simplify text scraping.<br>
This is how the code would look if it could be typed:<br>
<syntaxhighlight lang="dos">
when ScrapeButton.Click do
set ScrapeWeb.Url to SourceTextBox.Text
call ScrapeWeb.Get
when ScrapeWeb.GotText url,responseCode,responseType,responseContent do
initialize local Left to split at first text (text: get responseContent, at: PreTextBox.Text)
initialize local Right to "" in
set Right to select list item (list: get Left, index: 2)
set ResultLabel.Text to select list item (list: split at first (text:get Right, at: PostTextBox.Text), index: 1)
</syntaxhighlight>
[https://lh5.googleusercontent.com/-lFRRPzsi5N0/UvBM9E_gZMI/AAAAAAAAKBQ/AuqDPGlwXNg/s1600/composite.png A picture of the graphical program]/
=={{header|AppleScript}}==
''"Alternatively, if the above url is not working, grab the first date/time off this page's talk page."'' At the time of posting, the first date/time on the talk page is in Michael Mol's invitation to RC's Slack. The code here's aimed specifically at the ''first'' date on a page (but can be modified) and doesn't include error handling.
<syntaxhighlight lang="applescript">use AppleScript version "2.4" -- OS X 10.10 (Yosemite) or later
use framework "Foundation"
on firstDateonWebPage(URLText)
set |⌘| to current application
set pageURL to |⌘|'s class "NSURL"'s URLWithString:(URLText)
-- Fetch the page HTML as data.
-- The Xcode documentation advises against using dataWithContentsOfURL: over a network,
-- but I'm guessing this applies to downloading large files rather than a Web page's HTML.
-- If in doubt, the HTML can be fetched as text instead and converted to data in house.
set HTMLData to |⌘|'s class "NSData"'s dataWithContentsOfURL:(pageURL)
-- Or:
(*
set {HTMLText, encoding} to |⌘|'s class "NSString"'s stringWithContentsOfURL:(pageURL) ¬
usedEncoding:(reference) |error|:(missing value)
set HTMLData to HTMLText's dataUsingEncoding:(encoding)
*)
-- Extract the page's visible text from the HTML.
set straightText to (|⌘|'s class "NSAttributedString"'s alloc()'s initWithHTML:(HTMLData) ¬
documentAttributes:(missing value))'s |string|()
-- Use an NSDataDetector to locate the first date in the text. (It's assumed here there'll be one.)
set dateDetector to |⌘|'s class "NSDataDetector"'s dataDetectorWithTypes:(|⌘|'s NSTextCheckingTypeDate) ¬
|error|:(missing value)
set matchRange to dateDetector's rangeOfFirstMatchInString:(straightText) options:(0) ¬
range:({0, straightText's |length|()})
-- Return the date text found.
return (straightText's substringWithRange:(matchRange)) as text
end firstDateonWebPage
firstDateonWebPage("https://www.rosettacode.org/wiki/Talk:Web_scraping")</syntaxhighlight>
{{output}}
<syntaxhighlight lang="applescript">"20:59, 30 May 2020"</syntaxhighlight>
=={{header|AutoHotkey}}==
<
FileRead, timefile, time.html
pos := InStr(timefile, "UTC")
msgbox % time := SubStr(timefile, pos - 9, 8)</
=={{header|AWK}}==
Line 13 ⟶ 217:
This is inspired by [http://www.gnu.org/software/gawk/manual/gawkinet/html_node/GETURL.html#GETURL GETURL] example in the manual for gawk.
<tt><
BEGIN {
Line 33 ⟶ 237:
}
close(purl)
}</
=={{header|BBC BASIC}}==
{{works with|BBC BASIC for Windows}}
Note that the URL cache is cleared so the code works correctly if run more than once.
<syntaxhighlight lang="bbcbasic"> SYS "LoadLibrary", "URLMON.DLL" TO urlmon%
SYS "GetProcAddress", urlmon%, "URLDownloadToFileA" TO UDTF%
SYS "LoadLibrary", "WININET.DLL" TO wininet%
SYS "GetProcAddress", wininet%, "DeleteUrlCacheEntryA" TO DUCE%
url$ = "http://tycho.usno.navy.mil/cgi-bin/timer.pl"
file$ = @tmp$+"navytime.txt"
SYS DUCE%, url$
SYS UDTF%, 0, url$, file$, 0, 0 TO result%
IF result% ERROR 100, "Download failed"
file% = OPENIN(file$)
REPEAT
text$ = GET$#file%
IF INSTR(text$, "UTC") PRINT MID$(text$, 5)
UNTIL EOF#file%
CLOSE #file%</syntaxhighlight>
=={{header|C}}==
Line 40 ⟶ 266:
{{libheader|libcurl}}
There
<
#include <string.h>
#include <curl/curl.h>
Line 89 ⟶ 315:
regfree(&cregex);
return 0;
}</
=={{header|C sharp|C#}}==
<
{
static void Main(string[] args)
Line 174 ⟶ 342:
}
}
</syntaxhighlight>
=={{header|C++}}==
{{libheader|boost}}
{{works with|Visual Studio| 2010 Express Edition with boost-1.46.1 from boostpro.com}}
{{works with|gcc|4.5.2 with boost-1.46.1, compiled with -lboost_regex -lboost_system -lboost_thread}}
<syntaxhighlight lang="cpp">#include <iostream>
#include <string>
#include <boost/asio.hpp>
#include <boost/regex.hpp>
int main()
{
boost::asio::ip::tcp::iostream s("tycho.usno.navy.mil", "http");
if(!s)
std::cout << "Could not connect to tycho.usno.navy.mil\n";
s << "GET /cgi-bin/timer.pl HTTP/1.0\r\n"
<< "Host: tycho.usno.navy.mil\r\n"
<< "Accept: */*\r\n"
<< "Connection: close\r\n\r\n" ;
for(std::string line; getline(s, line); )
{
boost::smatch matches;
if(regex_search(line, matches, boost::regex("<BR>(.+\\s+UTC)") ) )
{
std::cout << matches[1] << '\n';
break;
}
}
}</syntaxhighlight>
=={{header|Caché ObjectScript}}==
<syntaxhighlight lang="cos">
Class Utils.Net [ Abstract ]
{
ClassMethod ExtractHTMLData(pHost As %String = "", pPath As %String = "", pRegEx As %String = "", Output list As %List) As %Status
{
// implement error handling
Try {
// some initialisation
Set list="", sc=$$$OK
// check input parameters
If $Match(pHost, "^([a-zA-Z0-9]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,6}$")=0 {
Set sc=$$$ERROR($$$GeneralError, "Invalid host name.")
Quit
}
// create http request and get page
Set req=##class(%Net.HttpRequest).%New()
Set req.Server=pHost
Do req.Get(pPath)
// check for success
If $Extract(req.HttpResponse.StatusCode)'=2 {
Set sc=$$$ERROR($$$GeneralError, "Page not loaded.")
Quit
}
// read http response stream
Set html=req.HttpResponse.Data
Set html.LineTerminator=$Char(10)
Set sc=html.Rewind()
// read http response stream
While 'html.AtEnd {
Set line=html.ReadLine(, .sc, .eol)
Set pos=$Locate(line, pRegEx)
If pos {
Set parse=$Piece($Extract(line, pos, *), $Char(9))
Set slot=$ListLength(list)+1
Set $List(list, slot)=parse
}
}
} Catch err {
// an error has occurred
If err.Name="<REGULAR EXPRESSION>" {
Set sc=$$$ERROR($$$GeneralError, "Invalid regular expression.")
} Else {
Set sc=$$$ERROR($$$CacheError, $ZError)
}
}
// return status
Quit sc
}
}
</syntaxhighlight>
{{out|Examples}}
<pre>
USER>Do ##class(Utils.Net).ExtractHTMLData("tycho.usno.navy.mil", "/cgi-bin/timer.pl", "[A-Za-z\.]{3,5} \d{1,2}, \d{1,2}:\d{2}:\d{2} UTC", .list)
USER>Write $List(list)
Mar. 29, 20:45:27 UTC
USER>Do ##class(Utils.Net).ExtractHTMLData("tycho.usno.navy.mil", "/cgi-bin/timer.pl", "[A-Za-z\.]{3,5} \d{1,2}, \d{1,2}:\d{2}:\d{2}", .list)
USER>Write $ListToString(list, $Char(13,10))
Mar. 29, 20:47:42 UTC
Mar. 29, 04:47:42 PM EDT
Mar. 29, 03:47:42 PM CDT
Mar. 29, 02:47:42 PM MDT
Mar. 29, 01:47:42 PM PDT
Mar. 29, 12:47:42 PM AKDT
Mar. 29, 10:47:42 AM HAST
</pre>
=={{header|Ceylon}}==
Don't forget to import ceylon.uri and ceylon.http.client in your module.ceylon file.
<syntaxhighlight lang="ceylon">import ceylon.uri {
parse
}
import ceylon.http.client {
get
}
shared void run() {
// apparently the cgi link is deprecated?
value oldUri = "http://tycho.usno.navy.mil/cgi-bin/timer.pl";
value newUri = "http://tycho.usno.navy.mil/timer.pl";
value contents = downloadContents(newUri);
value time = extractTime(contents);
print(time else "nothing found");
}
String downloadContents(String uriString) {
value uri = parse(uriString);
value request = get(uri);
value response = request.execute();
return response.contents;
}
String? extractTime(String contents) =>
contents
.lines
.filter((String element) => element.contains("UTC"))
.first
?.substring(4, 21);</syntaxhighlight>
=={{header|Clojure}}==
Clojure 1.2:
<syntaxhighlight lang="clojure">
(second (re-find #" (\d{1,2}:\d{1,2}:\d{1,2}) UTC" (slurp "http://tycho.usno.navy.mil/cgi-bin/timer.pl")))
</syntaxhighlight>
=={{header|CoffeeScript}}==
{{works with|node.js}}
<syntaxhighlight lang="coffeescript">
http = require 'http'
CONFIG =
host: 'tycho.usno.navy.mil'
path: '/cgi-bin/timer.pl'
# Web scraping code tends to be brittle, and this is no exception.
# The tycho time page does not use highly structured markup, so
# we do a real dirty scrape.
scrape_tycho_ust_time = (text) ->
for line in text.split '\n'
matches = line.match /(.*:\d\d UTC)/
if matches
console.log matches[0].replace '<BR>', ''
return
throw Error("unscrapable page!")
# This is low-level-ish code to get data from a URL. It's
# pretty general purpose, so you'd normally tuck this away
# in a library (or use somebody else's library).
wget = (host, path, cb) ->
options =
host: host
path: path
headers:
"Cache-Control": "max-age=0"
req = http.request options, (res) ->
s = ''
res.on 'data', (chunk) ->
s += chunk
res.on 'end', ->
cb s
req.end()
# Do our web scrape
do ->
wget CONFIG.host, CONFIG.path, (data) ->
scrape_tycho_ust_time data
</syntaxhighlight>
{{out}}
<pre>
> coffee web_scrape.coffee
Jan. 09, 19:19:07 UTC
</pre>
=={{header|Common Lisp}}==
Line 197 ⟶ 549:
{{libheader|DRAKMA}}
<
(regexp (load-time-value
(cl-ppcre:create-scanner "(?m)^.{4}(.+? UTC)")))
Line 206 ⟶ 558:
(when start
(subseq data (aref start-regs 0) (aref end-regs 0)))))
"Aug. 12, 04:29:51 UTC"</
Another Common Lisp solution
<syntaxhighlight lang="lisp">CL-USER> (cl-ppcre:do-matches-as-strings
(m ".*<BR>(.*)UTC.*"
(drakma:http-request "http://tycho.usno.navy.mil/cgi-bin/timer.pl"))
(print (cl-ppcre:regex-replace "<BR>(.*UTC).*" m "\\1")))
"Jul. 13, 06:32:01 UTC"</syntaxhighlight>
=={{header|D}}==
<syntaxhighlight lang="d">void main() {
import std.
foreach (line; "http://tycho.usno.navy.mil/cgi-bin/timer.pl".byLine)
if (line.canFind(" UTC"))
line[4 .. $].writeln;
}</syntaxhighlight>
=={{header|Delphi}}==
{{works with|Delphi 7}}
There are a number of ways to do this with Delphi using any one of a number of free/open source TCP/IP component suites such as, for example, ICS, Synapse and Indy (which ships with Delphi anyway). However, I thought it would be interesting to do this using the Winsock API direct.
<syntaxhighlight lang="delphi">
program WebScrape;
{$APPTYPE CONSOLE}
{.$DEFINE DEBUG}
uses
Classes,
Winsock;
{ Function to connect to host, send HTTP request and retrieve response }
function DoHTTPGET(const hostName: PAnsiChar; const resource: PAnsiChar; HTTPResponse: TStrings): Boolean;
const
Port: integer = 80;
CRLF = #13#10; // carriage return/line feed
var
WSAData: TWSAData;
Sock: TSocket;
SockAddrIn: TSockAddrIn;
IPAddress: PHostEnt;
bytesIn: integer;
inBuffer: array [0..1023] of char;
Req: string;
begin
Result := False;
HTTPResponse.Clear;
{ Initialise use of the Windows Sockets DLL.
Older Windows versions support Winsock 1.1 whilst newer Windows
include Winsock 2 but support 1.1. Therefore, we'll specify
version 1.1 ($101) as being the highest version of Windows Sockets
that we can use to provide greatest flexibility.
WSAData receives details of the Windows Sockets implementation }
Winsock.WSAStartUp($101, WSAData);
try
{ Create a socket for TCP/IP usage passing in
Address family spec: AF_INET (TCP, UDP, etc.)
Type specification: SOCK_STREAM
Protocol: IPPROTO_TCP (TCP) }
Sock := WinSock.Socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
try
// Check we have a valid socket
if (Sock <> INVALID_SOCKET) then
begin
// Populate socket address structure
with SockAddrIn do
begin
// Address family specification
sin_family := AF_INET;
// Port
sin_port := htons(Port);
// Address
sin_addr.s_addr := inet_addr(hostName);
end;
if (SockAddrIn.sin_addr.s_addr = INADDR_NONE) then
begin
{ As we're using a domain name instead of an
IP Address, we need to resolve the domain name }
IPAddress := Winsock.gethostbyname(hostName);
// Quit if we didn't get an IP Address
if (IPAddress = nil) then
Exit;
// Update the structure with the IP Address
SockAddrIn.sin_addr.s_addr := PLongint(IPAddress^.h_addr_list^)^;
end;
// Try to connect to host
if (Winsock.connect(Sock, SockAddrIn, SizeOf(SockAddrIn)) <> SOCKET_ERROR) then
begin
// OK - Connected
// Compose our request
// Each line of the request must be terminated with a carriage return/line feed
{ The First line specifies method (e.g. GET, POST), path to required resource,
and the HTTP version being used. These three fields are space separated. }
Req := 'GET '+resource+' HTTP/1.1' + CRLF +
// Host: is the only Required header in HTTP 1.1
'Host: '+hostName + CRLF +
{ Persistent connections are the default in HTTP 1.1 but, as we don't want
or need one for this exercise, we must include the "Connection: close"
header in our request }
'Connection: close' + CRLF +
CRLF; // Request must end with an empty line!
// Try to send the request to the host
if (Winsock.send(Sock,Req[1],Length(Req),0) <> SOCKET_ERROR) then
begin
// Initialise incoming data buffer (i.e. fill array with nulls)
FillChar(inBuffer,SizeOf(inBuffer),#0);
// Loop until nothing left to read
repeat
// Read incoming data from socket
bytesIn := Winsock.recv(Sock, inBuffer, SizeOf(inBuffer), 0);
// Assign buffer to Stringlist
HTTPResponse.Text := HTTPResponse.Text + Copy(string(inBuffer),1,bytesIn);
until
(bytesIn <= 0) or (bytesIn = SOCKET_ERROR);
{ Our list of response strings should
contain at least 1 line }
Result := HTTPResponse.Count > 0;
end;
end;
end;
finally
// Close our socket
Winsock.closesocket(Sock);
end;
finally
{ This causes our application to deregister itself from this
Windows Sockets implementation and allows the implementation
to free any resources allocated on our behalf. }
Winsock.WSACleanup;
end;
end;
{ Simple function to locate and return the UTC time from the
request sent to http://tycho.usno.navy.mil/cgi-bin/timer.pl
The HTTPResponse parameter contains both the HTTP Headers and
the HTML served up by the requested resource. }
function ParseResponse(HTTPResponse: TStrings): string;
var
i: Integer;
begin
Result := '';
{ Check first line for server response code
We want something like this: HTTP/1.1 200 OK }
if Pos('200',HTTPResponse[0]) > 0 then
begin
for i := 0 to Pred(HTTPResponse.Count) do
begin
{ The line we're looking for is something like this:
<BR>May. 04. 21:55:19 UTC Universal Time }
// Check each line
if Pos('UTC',HTTPResponse[i]) > 0 then
begin
Result := Copy(HTTPResponse[i],5,Pos('UTC',HTTPResponse[i])-1);
Break;
end;
end;
end
else
Result := 'HTTP Error: '+HTTPResponse[0];
end;
const
host: PAnsiChar = 'tycho.usno.navy.mil';
res : PAnsiChar = '/cgi-bin/timer.pl';
var
Response: TStrings;
begin
{ A TStringList is a TStrings descendant class
that is used to store and manipulate a list
of strings.
Instantiate a stringlist class to
hold the results of our HTTP GET }
Response := TStringList.Create;
try
// Try an HTTP GET request
if DoHTTPGET(host,res,Response) then
begin
{$IFDEF DEBUG}
{ Write the entire response to
the console window }
Writeln(Response.text);
{$ELSE}
{ Parse the response and write the
result to the console window }
Writeln(ParseResponse(Response));
{$ENDIF DEBUG}
end
else
Writeln('Error retrieving data');
finally
Response.Free;
end;
// Keep console window open
Readln;
end.
</syntaxhighlight>
Example using Indy's IdHTTP component.
<syntaxhighlight lang="delphi">program ReadUTCTime;
{$APPTYPE CONSOLE}
uses SysUtils, Classes, IdHTTP;
var
s: string;
lHTTP: TIdHTTP;
lReader: TStringReader;
begin
lHTTP := TIdHTTP.Create(nil);
try
lReader := TStringReader.Create(lHTTP.Get('http://tycho.usno.navy.mil/cgi-bin/timer.pl'));
while lReader.Peek > 0 do
begin
s := lReader.ReadLine;
if Pos('UTC', s) > 0 then
begin
Writeln(s);
Break;
end;
end;
finally
lHTTP.Free;
lReader.Free;
end;
end.</syntaxhighlight>
=={{header|E}}==
<
def rx`(?s).*>(@time.*? UTC).*` := html
println(time)
})</
=={{header|Erlang}}==
Using regular expressions:
<
-export([main/0]).
-define(Url, "http://tycho.usno.navy.mil/cgi-bin/timer.pl").
Line 258 ⟶ 841:
main() ->
=={{header|F_Sharp|F#}}==
This code is asynchronous - it will not block any threads while it waits on a response from the remote server.
<
open System
open System.Net
Line 277 ⟶ 860:
|> Async.RunSynchronously
|> printfn "%s"
</syntaxhighlight>
=={{header|Factor}}==
<
"http://tycho.usno.navy.mil/cgi-bin/timer.pl" http-get nip
[ "UTC" swap start [ 9 - ] [ 1 - ] bi ] keep subseq print</
=={{header|Forth}}==
{{works with|GNU Forth|0.7.0}}
<
: extract-time ( addr len type len -- time len )
Line 301 ⟶ 884:
s\" \r\n\r\n" search 0= abort" can't find headers!" \ skip headers
s" UTC" extract-time type cr
close-socket</
=={{header|FunL}}==
<syntaxhighlight lang="funl">import io.Source
case Source.fromURL( 'http://tycho.usno.navy.mil/cgi-bin/timer.pl', 'UTF-8' ).getLines().find( ('Eastern' in) ) of
Some( time ) -> println( time.substring(4) )
None -> error( 'Easter time not found' )</syntaxhighlight>
{{out}}
<pre>
Jul. 24, 01:38:23 AM EDT Eastern Time
</pre>
=={{header|Gambas}}==
<syntaxhighlight lang="gambas">Public Sub Main()
Dim sWeb, sTemp, sOutput As String 'Variables
Shell "wget -O /tmp/web http://tycho.usno.navy.mil/cgi-bin/timer.pl" Wait 'Use 'wget' to save the web file in /tmp/
sWeb = File.Load("/tmp/web") 'Open file and store in sWeb
For Each sTemp In Split(sWeb, gb.NewLine) 'Split the file by NewLines..
If InStr(sTemp, "UTC") Then 'If the line contains "UTC" then..
sOutPut = sTemp 'Extract the line into sOutput
Break 'Get out of here
End If
Next
Print Mid(sOutput, 5) 'Print the result without the '<BR>' tag
End</syntaxhighlight>
Output:
<pre>
Jun. 10, 15:22:25 UTC Universal Time
</pre>
=={{header|Go}}==
<syntaxhighlight lang="go">package main
import (
"bytes"
"encoding/xml"
"fmt"
"io"
"net/http"
"regexp"
"time"
)
func main() {
resp, err := http.Get("http://tycho.usno.navy.mil/cgi-bin/timer.pl")
if err != nil {
fmt.Println(err) // connection or request fail
return
}
defer resp.Body.Close()
var us string
var ux int
utc := []byte("UTC")
for p := xml.NewDecoder(resp.Body); ; {
t, err := p.RawToken()
switch err {
case nil:
case io.EOF:
fmt.Println("UTC not found")
return
default:
fmt.Println(err) // read or parse fail
return
}
if ub, ok := t.(xml.CharData); ok {
if ux = bytes.Index(ub, utc); ux != -1 {
// success: found a line with the string "UTC"
us = string([]byte(ub))
break
}
}
}
// first thing to try: parsing the expected date format
if t, err := time.Parse("Jan. 2, 15:04:05 UTC", us[:ux+3]); err == nil {
fmt.Println("parsed UTC:", t.Format("January 2, 15:04:05"))
return
}
// fallback: search for anything looking like a time and print that
tx := regexp.MustCompile("[0-2]?[0-9]:[0-5][0-9]:[0-6][0-9]")
if justTime := tx.FindString(us); justTime > "" {
fmt.Println("found UTC:", justTime)
return
}
// last resort: just print the whole element containing "UTC" and hope
// there is a human readable time in there somewhere.
fmt.Println(us)
}</syntaxhighlight>
{{out}}
<pre>
parsed UTC: May 23, 00:44:13
</pre>
=={{header|Groovy}}==
<syntaxhighlight lang="groovy">def time = "unknown"
def text = new URL('http://tycho.usno.navy.mil/cgi-bin/timer.pl').eachLine { line ->
def matcher = (line =~ "<BR>(.+) UTC")
if (matcher.find()) {
time = matcher[0][1]
}
}
println "UTC Time was '$time'"</syntaxhighlight>
{{out}}
<pre>UTC Time was 'Feb. 26, 11:02:30'</pre>
=={{header|Haskell}}==
Using package HTTP-4000.0.8 from [http://hackage.haskell.org/packages/hackage.html HackgageDB]
<
import Network.HTTP (simpleHTTP, getResponseBody, getRequest)
Line 311 ⟶ 1,004:
readUTC = simpleHTTP (getRequest tyd)>>=
fmap ((!!2).head.dropWhile ("UTC"`notElem`).map words.lines). getResponseBody>>=putStrLn</
Usage in GHCi:
<
08:30:23</
== Icon and Unicon ==
==={{header|Icon}}===
Icon has capability to read web pages using the external function cfunc. The Unicon messaging extensions are more succinct.
==={{header|Unicon}}===
<syntaxhighlight lang="unicon">procedure main()
m := open(url := "http://tycho.usno.navy.mil/cgi-bin/timer.pl","m") | stop("Unable to open ",url)
every (p := "") ||:= |read(m) # read the page into a single string
close(m)
map(p) ? ( tab(find("<br>")), ="<br>", write("UTC time=",p[&pos:find(" utc")])) # scrape and show
end</syntaxhighlight>
=={{header|J}}==
<
_8{. ' UTC' taketo gethttp 'http://tycho.usno.navy.mil/cgi-bin/timer.pl'
04:32:44</
The <code>[[J:Addons/web/gethttp|web/gethttp]]</code> addon uses Wget on Linux or Windows (J ships with Wget on Windows) and cURL on the Mac
(A sockets solution is also possible. But, while basic HTTP support is trivial to implement, a full standards compliant implementation and can involve a lot of code to deal with rare corner cases, and the time required to complete a web request is often significantly longer than the time to invoke an external program. This would imply a fair bit of maintenance and testing overhead to deal with issues which rarely matter, if a direct sockets implementation were used.)
=={{header|Java}}==
The http://tycho.usno.navy.mil/cgi-bin/timer.pl address is no longer available, although the parsing of the text is incredibly simple.
<syntaxhighlight lang="java">
String scrapeUTC() throws URISyntaxException, IOException {
String address = "http://tycho.usno.navy.mil/cgi-bin/timer.pl";
URL url = new URI(address).toURL();
try (BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream()))) {
Pattern pattern = Pattern.compile("^.+? UTC");
Matcher matcher;
String line;
while ((line = reader.readLine()) != null) {
matcher = pattern.matcher(line);
if (matcher.find())
return matcher.group().replaceAll("<.+?>", "");
}
}
return null;
}
</syntaxhighlight>
I'm using a cached page and get the following output.
<pre>
Jun. 25, 17:59:15 UTC
</pre>
<br />
Alternately, using Java 8, with the new web address given in the task description.
<syntaxhighlight lang="java">
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
public final class WebScraping {
public static void main(String[] aArgs) {
try {
URI uri = new URI("https://www.rosettacode.org/wiki/Talk:Web_scraping").parseServerAuthority();
URL address = uri.toURL();
HttpURLConnection connection = (HttpURLConnection) address.openConnection();
BufferedReader reader = new BufferedReader( new InputStreamReader(connection.getInputStream()) );
final int responseCode = connection.getResponseCode();
System.out.println("Response code: " + responseCode);
String line;
while ( ! ( line = reader.readLine() ).contains("UTC") ) {
/* Empty block */
}
final int index = line.indexOf("UTC");
System.out.println(line.substring(index - 16, index + 4));
reader.close();
connection.disconnect();
} catch (IOException ioe) {
System.err.println("Error connecting to server: " + ioe.getCause());
} catch (URISyntaxException use) {
System.err.println("Unable to connect to URI: " + use.getCause());
}
}
}
</syntaxhighlight>
{{ out }}
<pre>
Response code: 200
25 August 2022 (UTC)
</pre>
=={{header|JavaScript}}==
Due to browser cross-origin restrictions, this script will probably not work in other domains.
<syntaxhighlight lang="javascript">var req = new XMLHttpRequest();
req.onload = function () {
var re = /[JFMASOND].+ UTC/; //beginning of month name to 'UTC'
console.log(this.responseText.match(re)[0]);
};
req.open('GET', 'http://tycho.usno.navy.mil/cgi-bin/timer.pl', true);
req.send();</syntaxhighlight>
=={{header|jq}}==
{{works with|jq|1.4}}
Currently jq does not have built-in curl support, but jq is intended to work seamlessly with other command-line utilities, so we present a simple solution to the problem in the form of a three-line script:
<syntaxhighlight lang="sh">#!/bin/bash
curl -Ss 'http://tycho.usno.navy.mil/cgi-bin/timer.pl' |\
jq -R -r 'if index(" UTC") then .[4:] else empty end'</syntaxhighlight>
{{out}}
<syntaxhighlight lang="sh">$ ./Web_scraping.jq
Apr. 21, 05:19:32 UTC Universal Time</syntaxhighlight>
=={{header|Julia}}==
I'm using the <code>Requests.jl</code> package for this solution. Note, I used a slightly different URL after finding that the one specified in the task description is deprecated (though it still works).
<syntaxhighlight lang="julia">using Requests, Printf
function getusnotime()
const url = "http://tycho.usno.navy.mil/timer.pl"
s = try
get(url)
catch err
@sprintf "get(%s)\n => %s" url err
end
isa(s, Requests.Response) || return (s, false)
t = match(r"(?<=<BR>)(.*?UTC)", readstring(s))
isa(t, RegexMatch) || return (@sprintf("raw html:\n %s", readstring(s)), false)
return (t.match, true)
end
(t, issuccess) = getusnotime();
if issuccess
println("The USNO time is ", t)
else
println("Failed to fetch UNSO time:\n", t)
end
</syntaxhighlight>
{{out}}
<pre>
The USNO time is Apr. 20, 17:54:54 UTC
</pre>
'''Checks of Failure Detection'''
By breaking the USNO URL
<pre>
Failed to fetch UNSO time:
get(http://sycho.usno.navy.mil/timer.pl)
=> getaddrinfo callback: unknown node or service (EAI_NONAME)
</pre>
By breaking the regular expression (using <code><BR>(.*UTd)</code>)
<syntaxhighlight lang="html">
Failed to fetch UNSO time:
raw html:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final"//EN>
<html>
<body>
<TITLE>What time is it?</TITLE>
<H2> US Naval Observatory Master Clock Time</H2> <H3><PRE>
<BR>Apr. 20, 17:55:31 UTC Universal Time
<BR>Apr. 20, 01:55:31 PM EDT Eastern Time
<BR>Apr. 20, 12:55:31 PM CDT Central Time
<BR>Apr. 20, 11:55:31 AM MDT Mountain Time
<BR>Apr. 20, 10:55:31 AM PDT Pacific Time
<BR>Apr. 20, 09:55:31 AM AKDT Alaska Time
<BR>Apr. 20, 07:55:31 AM HAST Hawaii-Aleutian Time
</PRE></H3><P><A HREF="http://www.usno.navy.mil"> US Naval Observatory</A>
</body></html>
</syntaxhighlight>
=={{header|Kotlin}}==
<syntaxhighlight lang="scala">// version 1.1.3
import java.net.URL
import java.io.InputStreamReader
import java.util.Scanner
fun main(args: Array<String>) {
val url = URL("http://tycho.usno.navy.mil/cgi-bin/timer.pl")
val isr = InputStreamReader(url.openStream())
val sc = Scanner(isr)
while (sc.hasNextLine()) {
val line = sc.nextLine()
if ("UTC" in line) {
println(line.drop(4).take(17))
break
}
}
sc.close()
}</syntaxhighlight>
Sample output:
<pre>
Aug. 20, 22:38:26
</pre>
=={{header|Lasso}}==
<syntaxhighlight lang="lasso">/* have to be used
local(raw_htmlstring = '<TITLE>What time is it?</TITLE>
<H2> US Naval Observatory Master Clock Time</H2> <H3><PRE>
<BR>Jul. 27, 22:57:22 UTC Universal Time
<BR>Jul. 27, 06:57:22 PM EDT Eastern Time
<BR>Jul. 27, 05:57:22 PM CDT Central Time
<BR>Jul. 27, 04:57:22 PM MDT Mountain Time
<BR>Jul. 27, 03:57:22 PM PDT Pacific Time
<BR>Jul. 27, 02:57:22 PM AKDT Alaska Time
<BR>Jul. 27, 12:57:22 PM HAST Hawaii-Aleutian Time
</PRE></H3>
')
*/
// should be used
local(raw_htmlstring = string(include_url('http://tycho.usno.navy.mil/cgi-bin/timer.pl')))
local(
reg_exp = regexp(-find = `<br>(.*?) UTC`, -input = #raw_htmlstring, -ignorecase),
datepart_txt = #reg_exp -> find ? #reg_exp -> matchstring(1) | string
)
#datepart_txt
'<br />'
// 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`)</syntaxhighlight>
Result:
Jul. 27, 22:57:22
2013-07-27 22:57:22
=={{header|Liberty BASIC}}==
<syntaxhighlight lang="lb">if DownloadToFile("http://tycho.usno.navy.mil/cgi-bin/timer.pl", DefaultDir$ + "\timer.htm") = 0 then
open DefaultDir$ + "\timer.htm" for input as #f
html$ = lower$(input$(#f, LOF(#f)))
close #f
a= instr( html$, "utc" )-1
print "UTC";mid$( html$, a-9,9)
end if
end
function DownloadToFile(urlfile$, localfile$)
open "URLmon" for dll as #url
calldll #url, "URLDownloadToFileA",_
0 as long,_ 'null
urlfile$ as ptr,_ 'url to download
localfile$ as ptr,_ 'save file name
0 as long,_ 'reserved, must be 0
0 as long,_ 'callback address, can be 0
DownloadToFile as ulong '0=success
close #url
end function</syntaxhighlight>
Because Liberty has to do web operations in ways like this, calling Windows DLLs, there is the [[#Run BASIC|Run BASIC]] variant of LB, in which the task becomes a one-liner.
=={{header|Lua}}==
{{libheader|LuaSocket}}
The web page is split on the HTML line break tags. Each line is checked for the required time zone code. Once it is found, we return the instance within that line of three numbers separated by colons - I.E. the time.
<syntaxhighlight lang="lua">
local http = require("socket.http") -- Debian package is 'lua-socket'
function scrapeTime (pageAddress, timeZone)
local page = http.request(pageAddress)
if not page then return "Cannot connect" end
for line in page:gmatch("[^<BR>]*") do
if line:match(timeZone) then
return line:match("%d+:%d+:%d+")
end
end
end
local url = "http://tycho.usno.navy.mil/cgi-bin/timer.pl"
print(scrapeTime(url, "UTC"))
</syntaxhighlight>
The task description states "just the UTC time" but of course we could return the whole line including the zone name and date if required.
=={{header|M2000 Interpreter}}==
<syntaxhighlight lang="m2000 interpreter">
Module Web_scraping {
Print "Web scraping"
function GetTime$(a$, what$="UTC") {
document a$ ' change string to document
find a$, what$ ' place data to stack
Read find_pos
if find_pos>0 then
read par_order, par_pos
b$=paragraph$(a$, par_order)
k=instr(b$,">")
if k>0 then if k<par_pos then b$=mid$(b$,k+1) :par_pos-=k
k=rinstr(b$,"<")
if k>0 then if k>par_pos then b$=Left(b$,k-1)
=b$
end if
}
declare msxml2 "MSXML2.XMLHTTP.6.0"
rem print type$(msxml2)="IXMLHTTPRequest"
Url$ = "http://tycho.usno.navy.mil/cgi-bin/timer.pl"
try ok {
method msxml2, "Open", "GET", url$, false
method msxml2,"Send"
with msxml2,"responseText" as txt$
Print GetTime$(txt$)
}
If error or not ok then Print Error$
declare msxml2 nothing
}
Web_scraping
</syntaxhighlight>
=={{header|Maple}}==
<syntaxhighlight lang="maple">text := URL:-Get("http://tycho.usno.navy.mil/cgi-bin/timer.pl"):
printf(StringTools:-StringSplit(text,"<BR>")[2]);</syntaxhighlight>
{{Out|Output}}
<pre>May. 16, 20:17:28 UTC Universal Time</pre>
=={{header|Mathematica}}/{{header|Wolfram Language}}==
<syntaxhighlight lang="mathematica">test = StringSplit[Import["http://tycho.usno.navy.mil/cgi-bin/timer.pl"], "\n"];
Extract[test, Flatten@Position[StringFreeQ[test, "UTC"], False]]</syntaxhighlight>
=={{header|MATLAB}} / {{header|Octave}}==
<syntaxhighlight lang="matlab">s = urlread('http://tycho.usno.navy.mil/cgi-bin/timer.pl');
ix = [findstr(s,'<BR>'), length(s)+1];
for k = 2:length(ix)
tok = s(ix(k-1)+4:ix(k)-1);
if findstr(tok,'UTC')
disp(tok);
end;
end;</syntaxhighlight>
=={{header|Microsoft Small Basic}}==
<syntaxhighlight lang="vb">
'Entered by AykayayCiti -- Earl L. Montgomery
url_name = "http://tycho.usno.navy.mil/cgi-bin/timer.pl"
url_data = Network.GetWebPageContents(url_name)
find = "UTC"
' the length from the UTC to the time is -18 so we need
' to subtract from the UTC position
pos = Text.GetIndexOf(url_data,find)-18
result = Text.GetSubText(url_data,pos,(18+3)) 'plus 3 to add the UTC
TextWindow.WriteLine(result)
'you can eleminate a line of code by putting the
' GetIndexOf insde the GetSubText
'result2 = Text.GetSubText(url_data,Text.GetIndexOf(url_data,find)-18,(18+3))
'TextWindow.WriteLine(result2)</syntaxhighlight>
{{out}}
<pre>
Mar. 19, 04:19:34 UTC
Press any key to continue...
</pre>
=={{header|mIRC Scripting Language}}==
<syntaxhighlight lang="mirc">alias utc {
sockclose UTC
sockopen UTC tycho.usno.navy.mil 80
}
on *:SOCKOPEN:UTC: {
sockwrite -n UTC GET /cgi-bin/timer.pl HTTP/1.1
sockwrite -n UTC Host: tycho.usno.navy.mil
sockwrite UTC $crlf
}
on *:SOCKREAD:UTC: {
sockread %UTC
while ($sockbr) {
if (<BR>*Universal Time iswm %UTC) {
echo -ag $remove(%UTC,<BR>,$chr(9),Universal Time)
unset %UTC
sockclose UTC
return
}
sockread %UTC
}
}</syntaxhighlight>
=={{header|NetRexx}}==
<syntaxhighlight lang="netrexx">/* NetRexx */
options replace format comments java crossref symbols binary
parse arg full_short .
if 'FULL'.abbrev(full_short.upper(), 1) then
dateFull = isTrue()
else
dateFull = isFalse()
do
timeURL = java.net.URL('http://tycho.usno.navy.mil/cgi-bin/timer.pl')
conn = timeURL.openConnection()
ibr = BufferedReader(InputStreamReader(conn.getInputStream()))
line = Rexx
loop label readLoop while ibr.ready()
line = ibr.readLine()
if line = null then leave readLoop
line = line.translate(' ', '\t')
if line.wordpos('UTC') > 0 then do
parse line . '>' udatetime 'UTC' . -
0 . '>' . ',' utime 'UTC' .
if dateFull then
say udatetime.strip() 'UTC'
else
say utime.strip()
leave readLoop
end
end readLoop
ibr.close()
catch ex = IOException
ex.printStackTrace()
end
method isTrue() public constant returns boolean
return 1 == 1
method isFalse() public constant returns boolean
return \isTrue()
</syntaxhighlight>
{{out}}
<pre>
04:29:09
</pre>
or with an argument that matches 'FULL':
<pre>
Jul. 18, 04:29:09 UTC
</pre>
=={{header|Nim}}==
Using Rosetta Talk page URL.
<syntaxhighlight lang="nim">import httpclient, strutils
var client = newHttpClient()
var res: string
for line in client.getContent("https://rosettacode.org/wiki/Talk:Web_scraping").splitLines:
let k = line.find("UTC")
if k >= 0:
res = line[0..(k - 3)]
let k = res.rfind("</a>")
res = res[(k + 6)..^1]
break
echo if res.len > 0: res else: "No date/time found."</syntaxhighlight>
{{out}}
<pre>20:59, 30 May 2020</pre>
=={{header|Objeck}}==
<syntaxhighlight lang="objeck">
use Net;
use IO;
use Structure;
bundle Default {
class Scrape {
function : Main(args : String[]) ~ Nil {
client := HttpClient->New();
lines := client->Get("http://tycho.usno.navy.mil/cgi-bin/timer.pl", 80);
i := 0;
found := false;
while(found <> true & i < lines->Size()) {
line := lines->Get(i)->As(String);
index := line->Find("UTC");
if(index > -1) {
time := line->SubString(index - 9, 9)->Trim();
time->PrintLine();
found := true;
};
i += 1;
};
}
}
}
</syntaxhighlight>
=={{header|OCaml}}==
<
let _,_, page_content = make_request ~url:Sys.argv.(1) ~kind:GET () in
Line 365 ⟶ 1,505:
let str = Str.global_replace (Str.regexp "<BR>") "" str in
print_endline str;
;;</
There are libraries for this, but it's rather interesting to see how to use a socket to achieve this, so see the implementation of the above function <tt>make_request</tt> on [[Web_Scraping/OCaml|this page]].
=={{header|ooRexx}}==
This uses the RexxcURL wrapper for libcURL
As an alternative the supplied rxSock socket library could be used
<syntaxhighlight lang="oorexx">
/* load the RexxcURL library */
Call RxFuncAdd 'CurlLoadFuncs', 'rexxcurl', 'CurlLoadFuncs'
Call CurlLoadFuncs
url = "http://tycho.usno.navy.mil/cgi-bin/timer.pl"
/* get a curl session */
curl = CurlInit()
if curl \= ''
then do
call CurlSetopt curl, 'URL', Url
if curlerror.intcode \= 0 then exit
call curlSetopt curl, 'OUTSTEM', 'stem.'
if curlerror.intcode \= 0 then exit
call CurlPerform curl
/* content is in a stem - lets get it all in a string */
content = stem.~allItems~makestring('l')
/* now parse out utc time */
parse var content content 'Universal Time' .
utcTime = content~substr(content~lastpos('<BR>') + 4)
say utcTime
end</syntaxhighlight>
=={{header|Oz}}==
<
[Regex] = {Module.link ['x-oz://contrib/regex']}
Line 389 ⟶ 1,559:
Url = "http://tycho.usno.navy.mil/cgi-bin/timer.pl"
in
{System.showInfo {GetDateString {GetPage Url}}}</
=={{header|Peloton}}==
English dialect, short form, using integrated Rexx pattern matcher:
<syntaxhighlight lang="html"><@ DEFAREPRS>Rexx Parse</@>
<@ DEFPRSLIT>Rexx Parse|'<BR>' UTCtime 'UTC'</@>
<@ LETVARURL>timer|http://tycho.usno.navy.mil/cgi-bin/timer.pl</@>
<@ ACTRPNPRSVAR>Rexx Parse|timer</@>
<@ SAYVAR>UTCtime</@></syntaxhighlight>
English dialect, padded variable-length form:
<syntaxhighlight lang="html"><# DEFINE WORKAREA PARSEVALUES>Rexx Parse</#>
<# DEFINE PARSEVALUES LITERAL>Rexx Parse|'<BR>' UTCtime 'UTC'</#>
<# LET VARIABLE URLSOURCE>timer|http://tycho.usno.navy.mil/cgi-bin/timer.pl</#>
<# ACT REPLACEBYPATTERN PARSEVALUES VARIABLE>Rexx Parse|timer</#>
<# SAY VARIABLE>UTCtime</#></syntaxhighlight>
English dialect, padded short form, using string functions AFT and BEF:
<syntaxhighlight lang="html"><@ SAY AFT BEF URL LIT LIT LIT >http://tycho.usno.navy.mil/cgi-bin/timer.pl| UTC|<BR></@></syntaxhighlight>
=={{header|Perl}}==
{{libheader|LWP}}
<syntaxhighlight lang="perl">use LWP::Simple;
my $url = 'http://tycho.usno.navy.mil/cgi-bin/timer.pl';
get($url) =~ /<BR>(.+? UTC)/
and print "$1\n";</
=={{header|Phix}}==
{{libheader|Phix/libcurl}}
<!--<syntaxhighlight lang="phix">(notonline)-->
<span style="color: #000080;font-style:italic;">--
-- demo\rosetta\web_scrape.exw
-- ===========================
--</span>
<span style="color: #008080;">without</span> <span style="color: #008080;">js</span> <span style="color: #000080;font-style:italic;">-- (libcurl)</span>
<span style="color: #008080;">include</span> <span style="color: #000000;">builtins</span><span style="color: #0000FF;">\</span><span style="color: #000000;">libcurl</span><span style="color: #0000FF;">.</span><span style="color: #000000;">e</span>
<span style="color: #008080;">include</span> <span style="color: #000000;">builtins</span><span style="color: #0000FF;">\</span><span style="color: #004080;">timedate</span><span style="color: #0000FF;">.</span><span style="color: #000000;">e</span>
<span style="color: #004080;">object</span> <span style="color: #000000;">res</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">curl_easy_perform_ex</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"https://rosettacode.org/wiki/Talk:Web_scraping"</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">if</span> <span style="color: #004080;">string</span><span style="color: #0000FF;">(</span><span style="color: #000000;">res</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">then</span>
<span style="color: #000000;">res</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">split</span><span style="color: #0000FF;">(</span><span style="color: #000000;">res</span><span style="color: #0000FF;">,</span><span style="color: #008000;">'\n'</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">res</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
<span style="color: #008080;">if</span> <span style="color: #008080;">not</span> <span style="color: #7060A8;">match</span><span style="color: #0000FF;">(</span><span style="color: #008000;">`<div id="siteNotice">`</span><span style="color: #0000FF;">,</span><span style="color: #000000;">res</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">])</span> <span style="color: #008080;">then</span> <span style="color: #000080;font-style:italic;">-- (24/11/22, exclude notice)</span>
<span style="color: #004080;">integer</span> <span style="color: #000000;">k</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">match</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"UTC"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">res</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">])</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">k</span> <span style="color: #008080;">then</span>
<span style="color: #004080;">string</span> <span style="color: #000000;">line</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">res</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span> <span style="color: #000080;font-style:italic;">-- (debug aid)</span>
<span style="color: #000000;">res</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">line</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">..</span><span style="color: #000000;">k</span><span style="color: #0000FF;">-</span><span style="color: #000000;">3</span><span style="color: #0000FF;">]</span>
<span style="color: #000000;">k</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">rmatch</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"</a>"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">res</span><span style="color: #0000FF;">)</span>
<span style="color: #000000;">res</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">trim</span><span style="color: #0000FF;">(</span><span style="color: #000000;">res</span><span style="color: #0000FF;">[</span><span style="color: #000000;">k</span><span style="color: #0000FF;">+</span><span style="color: #000000;">5</span><span style="color: #0000FF;">..$])</span>
<span style="color: #008080;">exit</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
<span style="color: #0000FF;">?</span><span style="color: #000000;">res</span>
<span style="color: #008080;">if</span> <span style="color: #004080;">string</span><span style="color: #0000FF;">(</span><span style="color: #000000;">res</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">then</span>
<span style="color: #004080;">timedate</span> <span style="color: #000000;">td</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">parse_date_string</span><span style="color: #0000FF;">(</span><span style="color: #000000;">res</span><span style="color: #0000FF;">,</span> <span style="color: #0000FF;">{</span><span style="color: #008000;">"hh:mm, d Mmmm yyyy"</span><span style="color: #0000FF;">})</span>
<span style="color: #0000FF;">?</span><span style="color: #7060A8;">format_timedate</span><span style="color: #0000FF;">(</span><span style="color: #000000;">td</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"Dddd Mmmm ddth yyyy h:mpm"</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">else</span>
<span style="color: #0000FF;">?{</span><span style="color: #008000;">"some error"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">res</span><span style="color: #0000FF;">,</span><span style="color: #7060A8;">curl_easy_strerror</span><span style="color: #0000FF;">(</span><span style="color: #000000;">res</span><span style="color: #0000FF;">)}</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<!--</syntaxhighlight>-->
{{out}}
(From/as per talk page)
<pre>
"20:53, 20 August 2008"
"Wednesday August 20th 2008 8:53pm"
</pre>
=={{header|PHP}}==
By iterating over each line:
<syntaxhighlight lang="php"><?
$contents = file('http://tycho.usno.navy.mil/cgi-bin/timer.pl');
Line 408 ⟶ 1,639:
echo subStr($line, 4, $pos - 4); //Prints something like "Dec. 06, 16:18:03"
break;
}</
By [[regular expressions]] ({{works with|PHP|4.3.0}}):
<syntaxhighlight lang="php"><?
echo preg_replace(
);
</syntaxhighlight>
=={{header|PicoLisp}}==
<
(client "tycho.usno.navy.mil" 80 "cgi-bin/timer.pl"
(when (from "<BR>")
(pack (trim (till "U"))) ) )</
{{out}}
<pre>-> "Feb. 19, 18:11:37"</pre>
=={{header|PowerShell}}==
<
$html = $wc.DownloadString('http://tycho.usno.navy.mil/cgi-bin/timer.pl')
$html -match ', (.*) UTC' | Out-Null
Write-Host $Matches[1]</
===fyi===
.NET provides a property named '''UtcNow''':
<syntaxhighlight lang="powershell">
[System.DateTime]::UtcNow
</syntaxhighlight>
{{Out}}
<pre>
Wednesday, December 14, 2016 2:06:25 AM
</pre>
I am currently in the Pacific timezone:
<syntaxhighlight lang="powershell">
[System.DateTime]::Now
</syntaxhighlight>
{{Out}}
<pre>
Tuesday, December 13, 2016 6:06:25 PM
</pre>
=={{header|PureBasic}}==
<
ReadFile(0, "timer.htm")
While Not Eof(0) : Text$ + ReadString(0) : Wend
MessageRequester("Time", Mid(Text$, FindString(Text$, "UTC", 1) - 9 , 8))</
=={{header|Python}}==
<
page = urllib.urlopen('http://tycho.usno.navy.mil/cgi-bin/timer.pl')
for line in page:
Line 449 ⟶ 1,698:
print line.strip()[4:]
break
page.close()</
{{out}}
<pre>Aug. 12, 15:22:08 UTC Universal Time</pre>
=={{header|R}}==
There are two ways of scraping data from webpages. You can either convert the page into an array of strings containing each line of HTML and use regular expressions to locate the useful data, or you can parse the HTML and use xPath to locate them. The first method is quicker for simpler pages, but may become more difficult for more complicated ones.
=== Regex method ===
Read the page as lines, find the line containing the string "UTC", then extract the portion of that string that is the date.
<syntaxhighlight lang="r">
all_lines <- readLines("http://tycho.usno.navy.mil/cgi-bin/timer.pl")
utc_line <- grep("UTC", all_lines, value = TRUE)
matched <- regexpr("(\\w{3}.*UTC)", utc_line)
utc_time_str <- substring(line, matched, matched + attr(matched, "match.length") - 1L)
</syntaxhighlight>
The last three lines can be made simpler by using {{libheader|stringr}}
<syntaxhighlight lang="r">
library(stringr)
utc_line <- all_lines[str_detect(all_lines, "UTC")]
utc_time_str <- str_extract(utc_line, "\\w{3}.*UTC")
</syntaxhighlight>
Finally, the date and time must be parsed and printed in the desired format.
<syntaxhighlight lang="r">
utc_time <- strptime(utc_time_str, "%b. %d, %H:%M:%S UTC")
strftime(utc_time, "%A, %d %B %Y, %H:%M:%S")
</syntaxhighlight>
Friday, 13 May 2011, 15:12:20
=== Parsing method ===
{{libheader|RCurl}}
{{libheader|XML}}
First, retrieve the web page. See [[HTTP_Request]] for more options with this.
<syntaxhighlight lang="r">
library(RCurl)
web_page <- getURL("http://tycho.usno.navy.mil/cgi-bin/timer.pl")
</syntaxhighlight>
Now parse the html code into a tree and retrieve the pre node that contains interesting bit. Without xPath, the syntax is quite clunky.
<syntaxhighlight lang="r">
library(XML)
page_tree <- htmlTreeParse(webpage)
times_node <- page_tree$children$html$children$body$children$h3$children$pre$children
times_node <- times_node[names(times_node) == "text"]
time_lines <- sapply(times_node, function(x) x$value)
</syntaxhighlight>
Here, xPath simplifies things a little bit.
<syntaxhighlight lang="r">
page_tree <- htmlTreeParse(web_page, useInternalNodes = TRUE)
times_node <- xpathSApply(page_tree, "//pre")[[1]]
times_node <- times_node[names(times_node) == "text"]
time_lines <- sapply(times_node, function(x) as(x, "character"))
</syntaxhighlight>
Either way, the solution proceeds from here as in the regex method.
<syntaxhighlight lang="r">
utc_line <- time_lines[str_detect(time_lines, "UTC")]
#etc.
</syntaxhighlight>
=={{header|Racket}}==
<syntaxhighlight lang="racket">
#lang racket
(require net/url)
((compose1 car (curry regexp-match #rx"[^ <>][^<>]+ UTC")
port->string get-pure-port string->url)
"https://tycho.usno.navy.mil/cgi-bin/timer.pl")
</syntaxhighlight>
=={{header|Raku}}==
(formerly Perl 6)
<syntaxhighlight lang="raku" line># 20210301 Updated Raku programming solution
use HTTP::Client; # https://github.com/supernovus/perl6-http-client/
#`[ Site inaccessible since 2019 ?
my $site = "http://tycho.usno.navy.mil/cgi-bin/timer.pl";
HTTP::Client.new.get($site).content.match(/'<BR>'( .+? <ws> UTC )/)[0].say
# ]
my $site = "https://www.utctime.net/";
my $matched = HTTP::Client.new.get($site).content.match(
/'<td>UTC</td><td>'( .*Z )'</td>'/
)[0];
say $matched;
#$matched = '12321321:412312312 123';
with DateTime.new($matched.Str) {
say 'The fetch result seems to be of a valid time format.'
} else {
CATCH { put .^name, ': ', .Str }
}</syntaxhighlight>
Note that the string between '<' and '>' refers to regex tokens, so to match a literal '<BR>' you need to quote it, while <ws> refers to the built-in token whitespace.
Also, whitespace is ignored by default in Raku regexes.
{{out}}
<pre>
｢2021-03-01T17:02:37Z｣
The fetch result seems to be of a valid time format.
</pre>
=={{header|REBOL}}==
<
URL: http://rosettacode.org/wiki/Web_Scraping
]
Line 503 ⟶ 1,838:
parse html [thru <br> copy current thru "UTC" to end]
print ["Current UTC time:" current]</
=={{header|Ruby}}==
Line 509 ⟶ 1,844:
A verbose example for comparison
<syntaxhighlight lang="ruby">require "open-uri"
open('http://tycho.usno.navy.mil/cgi-bin/timer.pl') do |p|
Line 520 ⟶ 1,854:
end
end
</syntaxhighlight>
A more concise example
<syntaxhighlight lang="ruby">require 'open-uri'
puts URI.parse('http://tycho.usno.navy.mil/cgi-bin/timer.pl').read.match(/ (\d{1,2}:\d{1,2}:\d{1,2}) UTC/)[1]
</syntaxhighlight>
=={{header|Run BASIC}}==
<syntaxhighlight lang="runbasic">print word$(word$(httpget$("http://tycho.usno.navy.mil/cgi-bin/timer.pl"),1,"UTC"),2,"<BR>")</syntaxhighlight>
{{out}}
<pre>May. 09, 16:13:44</pre>
=={{header|Rust}}==
{{trans|Raku}}
<syntaxhighlight lang="rust">// 202100302 Rust programming solution
use std::io::Read;
use regex::Regex;
fn main() {
let client = reqwest::blocking::Client::new();
let site = "https://www.utctime.net/";
let mut res = client.get(site).send().unwrap();
let mut body = String::new();
res.read_to_string(&mut body).unwrap();
let re = Regex::new(r#"<td>UTC</td><td>(.*Z)</td>"#).unwrap();
let caps = re.captures(&body).unwrap();
println!("Result : {:?}", caps.get(1).unwrap().as_str());
}</syntaxhighlight>
{{out}}
<pre>
Result : "2021-03-02T16:27:02Z"
</pre>
=={{header|Scala}}==
<syntaxhighlight lang="scala">
import scala.io.Source
object WebTime extends Application {
val text = Source.fromURL("http://tycho.usno.navy.mil/cgi-bin/timer.pl")
val utc = text.getLines.find(_.contains("UTC"))
utc match {
case Some(s) => println(s.substring(4))
case _ => println("error")
}
}
</syntaxhighlight>
=={{header|Scheme}}==
{{works with|Guile}}
<syntaxhighlight lang="scheme">; Use the regular expression module to parse the url
(use-modules (ice-9 regex) (ice-9 rdelim))
; Variable to store result
(define time "")
; Set the url and parse the hostname, port, and path into variables
(define url "http://tycho.usno.navy.mil/cgi-bin/timer.pl")
(define r (make-regexp "^(http://)?([^:/]+)(:)?(([0-9])+)?(/.*)?" regexp/icase))
(define host (match:substring (regexp-exec r url) 2))
(define port (match:substring (regexp-exec r url) 4))
(define path (match:substring (regexp-exec r url) 6))
; Set port to 80 if it wasn't set above and convert from a string to a number
(if (eq? port #f) (define port "80"))
(define port (string->number port))
; Connect to remote host on specified port
(let ((s (socket PF_INET SOCK_STREAM 0)))
(connect s AF_INET (car (hostent:addr-list (gethostbyname host))) port)
; Send a HTTP request for the specified path
(display "GET " s)
(display path s)
(display " HTTP/1.0\r\n\r\n" s)
(set! r (make-regexp "<BR>(.+? UTC)"))
(do ((line (read-line s) (read-line s))) ((eof-object? line))
(if (regexp-match? (regexp-exec r line))
(set! time (match:substring (regexp-exec r line) 1)))))
; Display result
(display time)
(newline)</syntaxhighlight>
=={{header|Seed7}}==
<syntaxhighlight lang="seed7">$ include "seed7_05.s7i";
include "gethttp.s7i";
const proc: main is func
local
var string: pageWithTime is "";
var integer: posOfUTC is 0;
var integer: posOfBR is 0;
var string: timeStri is "";
begin
pageWithTime := getHttp("tycho.usno.navy.mil/cgi-bin/timer.pl");
posOfUTC := pos(pageWithTime, "UTC");
if posOfUTC <> 0 then
posOfBR := rpos(pageWithTime, "<BR>", posOfUTC);
if posOfBR <> 0 then
timeStri := pageWithTime[posOfBR + 4 .. pred(posOfUTC)];
writeln(timeStri);
end if;
end if;
end func;</syntaxhighlight>
=={{header|Sidef}}==
<syntaxhighlight lang="ruby">var ua = frequire('LWP::Simple');
var url = 'http://tycho.usno.navy.mil/cgi-bin/timer.pl';
var match = /<BR>(.+? UTC)/.match(ua.get(url));
say match[0] if match;</syntaxhighlight>
{{out}}
<pre>
Oct. 27, 00:20:50 UTC
</pre>
=={{header|Standard ML}}==
Done in PolyML, needs fetch and sed. Basically the same as the function in [[PPM_conversion_through_a_pipe#Standard_ML]].
<syntaxhighlight lang="standard ml">
val getTime = fn url =>
let
val fname = "/tmp/fConv" ^ (String.extract (Time.toString (Posix.ProcEnv.time()),7,NONE) );
val shellCommand = " fetch -o - \""^ url ^"\" | sed -ne 's/^.*alt=.Los Angeles:\\(.* (Daylight Saving)\\).*$/\\1/p' " ;
val me = ( Posix.FileSys.mkfifo
(fname,
Posix.FileSys.S.flags [ Posix.FileSys.S.irusr,Posix.FileSys.S.iwusr ]
) ;
Posix.Process.fork ()
)
in
if (Option.isSome me) then
let
val fin =TextIO.openIn fname
in
( Posix.Process.sleep (Time.fromReal 0.5) ;
TextIO.inputLine fin before
(TextIO.closeIn fin ; OS.FileSys.remove fname )
)
end
else
( OS.Process.system ( shellCommand ^ " > " ^ fname ^ " 2>&1 " ) ;
SOME "" before OS.Process.exit OS.Process.success
)
end;
print ( valOf (getTime "http://www.time.org"));
</syntaxhighlight>
output
<syntaxhighlight lang="sml">11:12 AM (PDT) (Daylight Saving)</syntaxhighlight>
=={{header|Tcl}}==
===<tt>http</tt> and regular expressions===
<syntaxhighlight lang="tcl">package require http
set request [http::geturl "http://tycho.usno.navy.mil/cgi-bin/timer.pl"]
if {[regexp -line {<BR>(.* UTC)} [http::data $request] --> utc]} {
puts $utc
}</
===curl(1) and list operations===
Considering the web resource returns tabular data wrapped in a <tt><PRE></tt> tag, you can use Tcl's list processing commands to process its contents.
<syntaxhighlight lang="tcl">set data [exec curl -s http://tycho.usno.navy.mil/cgi-bin/timer.pl]
puts [lrange [lsearch -glob -inline [split $data <BR>] *UTC*] 0 3]</syntaxhighlight>
=={{header|ToffeeScript}}==
<syntaxhighlight lang="coffeescript">e, page = require('request').get! 'http://tycho.usno.navy.mil/cgi-bin/timer.pl'
l = line for line in page.body.split('\n') when line.indexOf('UTC')>0
console.log l.substr(4,l.length-20)</syntaxhighlight>
=={{header|TUSCRIPT}}==
<syntaxhighlight lang="tuscript">
$$ MODE TUSCRIPT
SET time = REQUEST ("http://tycho.usno.navy.mil/cgi-bin/timer.pl")
SET utc = FILTER (time,":*UTC*:",-)
</syntaxhighlight>
=={{header|TXR}}==
==== Robust ====
Large amounts of the document are matched (in fact the entire thing!), rather than blindly looking for some small amount of context.
If the web page changes too much, the query will fail to match. TXR will print the word "false" and terminate with a failed exit status. This is preferrable to finding a false positive match and printing a wrong result. (E.g. any random garbage that happened to be in a line of HTML accidentally containing the string UTC).
<syntaxhighlight lang="txr">@(next @(open-command "wget -c http://tycho.usno.navy.mil/cgi-bin/timer.pl -O - 2> /dev/null"))
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final"//EN>
<html>
<body>
<TITLE>What time is it?</TITLE>
<H2> US Naval Observatory Master Clock Time</H2> <H3><PRE>
@(collect :vars (MO DD HH MM SS (PM " ") TZ TZNAME))
<BR>@MO. @DD, @HH:@MM:@SS @(maybe)@{PM /PM/} @(end)@TZ@/\t+/@TZNAME
@ (until)
</PRE>@/.*/
@(end)
</PRE></H3><P><A HREF="http://www.usno.navy.mil"> US Naval Observatory</A>
</body></html>
@(output)
@ (repeat)
@MO-@DD @HH:@MM:@SS @PM @TZ
@ (end)
@(end)</syntaxhighlight>
Sample run:<pre>$ txr navytime.txr
Nov-22 22:49:41 UTC
Nov-22 05:49:41 PM EST
Nov-22 04:49:41 PM CST
Nov-22 03:49:41 PM MST
Nov-22 02:49:41 PM PST
Nov-22 01:49:41 PM AKST
Nov-22 12:49:41 PM HAST</pre>
Get just the UTC time:
<pre>$ txr -DTZ=UTC navytime.txr
Nov-22 22:50:16 UTC</pre>
==== Naive ====
Skip stuff until a line beginning with <code><BR></code> has some stuff before "UTC", and capture that stuff:
<syntaxhighlight lang="txr">@(next @(open-command "wget -c http://tycho.usno.navy.mil/cgi-bin/timer.pl -O - 2> /dev/null"))
@(skip)
<BR>@time@\ UTC@(skip)
@(output)
@time
@(end)</syntaxhighlight>
=={{header|UNIX Shell}}==
This solution uses 'curl
<
curl -s http://tycho.usno.navy.mil/cgi-bin/timer.pl |
sed -ne 's/^<BR>\(.* UTC\).*$/\1/p'</syntaxhighlight>
This solution uses tcsh, wget and awk
<syntaxhighlight lang="tcsh">#!/usr/bin/tcsh -f
set page = `wget -q -O- "http://tycho.usno.navy.mil/cgi-bin/timer.pl"`
echo `awk -v s="${page[22]}" 'BEGIN{print substr(s,5,length(s))}'` ${page[23]} ${page[24]}</syntaxhighlight>
=={{header|Ursala}}==
This works by launching the wget command in a separate process and capturing its output.
<
#import cli
Line 557 ⟶ 2,117:
<.file$[contents: --<''>]>+ -+
@hm skip/*4+ ~=(9%cOi&)-~l*+ *~ ~&K3/'UTC',
(ask bash)/0+ -[wget -O - http://tycho.usno.navy.mil/cgi-bin/timer.pl]-!+-</
Here is a bash session.
<pre>$ whatime
Line 563 ⟶ 2,123:
{{omit from|TI-83 BASIC}} {{omit from|TI-89 BASIC}} <!-- Does not have network access. -->
=={{header|VBA}}==
Note For this example I altered the VBScript
<syntaxhighlight lang="vb">Rem add Microsoft VBScript Regular Expression X.X to your Tools References
Function GetUTC() As String
Url = "http://tycho.usno.navy.mil/cgi-bin/timer.pl"
With CreateObject("MSXML2.XMLHTTP.6.0")
.Open "GET", Url, False
.send
arrt = Split(.responseText, vbLf)
End With
For Each t In arrt
If InStr(t, "UTC") Then
GetUTC = StripHttpTags(t)
Exit For
End If
Next
End Function
Function StripHttpTags(s)
With New RegExp
.Global = True
.Pattern = "\<.+?\>"
If .Test(s) Then
StripHttpTags = .Replace(s, "")
Else
StripHttpTags = s
End If
End With
End Function
Sub getTime()
Rem starting point
Dim ReturnValue As String
ReturnValue = GetUTC
Rem debug.print can be removed
Debug.Print ReturnValue
MsgBox (ReturnValue)
End Sub</syntaxhighlight>
{{Out}}
<pre>
Run getTime Subroutine
Mar. 05, 00:57:37 UTC Universal Time
</pre>
=={{header|VBScript}}==
<syntaxhighlight lang="vb">Function GetUTC() As String
Url = "http://tycho.usno.navy.mil/cgi-bin/timer.pl"
With CreateObject("MSXML2.XMLHTTP.6.0")
.Open "GET", Url, False
.send
arrt = Split(.responseText, vbLf)
End With
For Each t In arrt
If InStr(t, "UTC") Then
GetUTC = StripHttpTags(t)
Exit For
End If
Next
End Function
Function StripHttpTags(s)
With New RegExp
.Global = True
.Pattern = "\<.+?\>"
If .Test(s) Then
StripHttpTags = .Replace(s, "")
Else
StripHttpTags = s
End If
End With
End Function
WScript.StdOut.Write GetUTC
WScript.StdOut.WriteLine</syntaxhighlight>
{{Out}}
<pre>
Run getTime Subroutine
Apr. 21, 21:02:03 UTC Universal Time
</pre>
=={{header|Visual Basic .NET}}==
New, .NET way with StringReader:
<
Imports System.IO
Dim client As WebClient = New WebClient()
Line 577 ⟶ 2,225:
Console.WriteLine(time(0))
End If
End While</
Alternative, old fashioned way using VB "Split" function:
<
Dim client As WebClient = New WebClient()
Dim content As String = client.DownloadString("http://tycho.usno.navy.mil/cgi-bin/timer.pl")
Line 589 ⟶ 2,237:
Console.WriteLine(time(0))
End If
Next</
=={{header|V (Vlang)}}==
<syntaxhighlight lang="Zig">
import net.http
import net.html
fn main() {
resp := http.get("https://www.utctime.net") or {println(err) exit(-1)}
html_doc := html.parse(resp.body)
utc := html_doc.get_tag("table").str().split("UTC</td><td>")[1].split("</td>")[0]
rfc_850 := html_doc.get_tag("table").str().split("RFC 850</td><td>")[1].split("</td>")[0]
println(utc)
println(rfc_850)
}
</syntaxhighlight>
{{out}}
<pre>
2023-06-06T12:08:01Z
Tuesday, 06-Jun-23 12:08:01 UTC
</pre>
=={{header|Wren}}==
{{libheader|libcurl}}
{{libheader|Wren-pattern}}
An embedded program so we can ask the C host to download the page for us. This task's talk page is being used for this purpose as the original URL no longer works.
The code is based in part on the C example though, as we don't have regex, we use our Pattern module to identify the first occurrence of a UTC date/time after the site notice.
<syntaxhighlight lang="wren">/* Web_scraping.wren */
import "./pattern" for Pattern
var CURLOPT_URL = 10002
var CURLOPT_FOLLOWLOCATION = 52
var CURLOPT_WRITEFUNCTION = 20011
var CURLOPT_WRITEDATA = 10001
var BUFSIZE = 16384 * 4
foreign class Buffer {
construct new(size) {}
// returns buffer contents as a string
foreign value
}
foreign class Curl {
construct easyInit() {}
foreign easySetOpt(opt, param)
foreign easyPerform()
foreign easyCleanup()
}
var buffer = Buffer.new(BUFSIZE)
var curl = Curl.easyInit()
curl.easySetOpt(CURLOPT_URL, "https://rosettacode.org/wiki/Talk:Web_scraping")
curl.easySetOpt(CURLOPT_FOLLOWLOCATION, 1)
curl.easySetOpt(CURLOPT_WRITEFUNCTION, 0) // write function to be supplied by C
curl.easySetOpt(CURLOPT_WRITEDATA, buffer)
curl.easyPerform()
curl.easyCleanup()
var html = buffer.value
var ix = html.indexOf("(UTC)")
ix = html.indexOf("(UTC)", ix + 1) // skip the site notice
if (ix == -1) {
System.print("UTC time not found.")
return
}
var p = Pattern.new("/d/d:/d/d, #12/d +1/a =4/d")
var m = p.find(html[(ix - 30).max(0)...ix])
System.print(m.text)</syntaxhighlight>
<br>
We now embed this in the following C program, compile and run it.
<syntaxhighlight lang="c">/* gcc Web_scraping.c -o Web_scraping -lcurl -lwren -lm */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>
#include "wren.h"
/* C <=> Wren interface functions */
char *url, *read_file, *write_file;
size_t bufsize;
size_t lr = 0;
size_t filterit(void *ptr, size_t size, size_t nmemb, void *stream) {
if ((lr + size*nmemb) > bufsize) return bufsize;
memcpy(stream+lr, ptr, size * nmemb);
lr += size * nmemb;
return size * nmemb;
}
void C_bufferAllocate(WrenVM* vm) {
bufsize = (int)wrenGetSlotDouble(vm, 1);
wrenSetSlotNewForeign(vm, 0, 0, bufsize);
}
void C_curlAllocate(WrenVM* vm) {
CURL** pcurl = (CURL**)wrenSetSlotNewForeign(vm, 0, 0, sizeof(CURL*));
*pcurl = curl_easy_init();
}
void C_value(WrenVM* vm) {
const char *s = (const char *)wrenGetSlotForeign(vm, 0);
wrenSetSlotString(vm, 0, s);
}
void C_easyPerform(WrenVM* vm) {
CURL* curl = *(CURL**)wrenGetSlotForeign(vm, 0);
curl_easy_perform(curl);
}
void C_easyCleanup(WrenVM* vm) {
CURL* curl = *(CURL**)wrenGetSlotForeign(vm, 0);
curl_easy_cleanup(curl);
}
void C_easySetOpt(WrenVM* vm) {
CURL* curl = *(CURL**)wrenGetSlotForeign(vm, 0);
CURLoption opt = (CURLoption)wrenGetSlotDouble(vm, 1);
if (opt < 10000) {
long lparam = (long)wrenGetSlotDouble(vm, 2);
curl_easy_setopt(curl, opt, lparam);
} else if (opt < 20000) {
if (opt == CURLOPT_WRITEDATA) {
char *buffer = (char *)wrenGetSlotForeign(vm, 2);
curl_easy_setopt(curl, opt, buffer);
} else if (opt == CURLOPT_URL) {
const char *url = wrenGetSlotString(vm, 2);
curl_easy_setopt(curl, opt, url);
}
} else if (opt < 30000) {
if (opt == CURLOPT_WRITEFUNCTION) {
curl_easy_setopt(curl, opt, &filterit);
}
}
}
WrenForeignClassMethods bindForeignClass(WrenVM* vm, const char* module, const char* className) {
WrenForeignClassMethods methods;
methods.allocate = NULL;
methods.finalize = NULL;
if (strcmp(module, "main") == 0) {
if (strcmp(className, "Buffer") == 0) {
methods.allocate = C_bufferAllocate;
} else if (strcmp(className, "Curl") == 0) {
methods.allocate = C_curlAllocate;
}
}
return methods;
}
WrenForeignMethodFn bindForeignMethod(
WrenVM* vm,
const char* module,
const char* className,
bool isStatic,
const char* signature) {
if (strcmp(module, "main") == 0) {
if (strcmp(className, "Buffer") == 0) {
if (!isStatic && strcmp(signature, "value") == 0) return C_value;
} else if (strcmp(className, "Curl") == 0) {
if (!isStatic && strcmp(signature, "easySetOpt(_,_)") == 0) return C_easySetOpt;
if (!isStatic && strcmp(signature, "easyPerform()") == 0) return C_easyPerform;
if (!isStatic && strcmp(signature, "easyCleanup()") == 0) return C_easyCleanup;
}
}
return NULL;
}
static void writeFn(WrenVM* vm, const char* text) {
printf("%s", text);
}
void errorFn(WrenVM* vm, WrenErrorType errorType, const char* module, const int line, const char* msg) {
switch (errorType) {
case WREN_ERROR_COMPILE:
printf("[%s line %d] [Error] %s\n", module, line, msg);
break;
case WREN_ERROR_STACK_TRACE:
printf("[%s line %d] in %s\n", module, line, msg);
break;
case WREN_ERROR_RUNTIME:
printf("[Runtime Error] %s\n", msg);
break;
}
}
char *readFile(const char *fileName) {
FILE *f = fopen(fileName, "r");
fseek(f, 0, SEEK_END);
long fsize = ftell(f);
rewind(f);
char *script = malloc(fsize + 1);
fread(script, 1, fsize, f);
fclose(f);
script[fsize] = 0;
return script;
}
static void loadModuleComplete(WrenVM* vm, const char* module, WrenLoadModuleResult result) {
if( result.source) free((void*)result.source);
}
WrenLoadModuleResult loadModule(WrenVM* vm, const char* name) {
WrenLoadModuleResult result = {0};
if (strcmp(name, "random") != 0 && strcmp(name, "meta") != 0) {
result.onComplete = loadModuleComplete;
char fullName[strlen(name) + 6];
strcpy(fullName, name);
strcat(fullName, ".wren");
result.source = readFile(fullName);
}
return result;
}
int main(int argc, char **argv) {
WrenConfiguration config;
wrenInitConfiguration(&config);
config.writeFn = &writeFn;
config.errorFn = &errorFn;
config.bindForeignClassFn = &bindForeignClass;
config.bindForeignMethodFn = &bindForeignMethod;
config.loadModuleFn = &loadModule;
WrenVM* vm = wrenNewVM(&config);
const char* module = "main";
const char* fileName = "Web_scraping.wren";
char *script = readFile(fileName);
WrenInterpretResult result = wrenInterpret(vm, module, script);
switch (result) {
case WREN_RESULT_COMPILE_ERROR:
printf("Compile Error!\n");
break;
case WREN_RESULT_RUNTIME_ERROR:
printf("Runtime Error!\n");
break;
case WREN_RESULT_SUCCESS:
break;
}
wrenFreeVM(vm);
free(script);
return 0;
}</syntaxhighlight>
{{out}}
<pre>
20:53, 20 August 2008
</pre>
=={{header|Xidel}}==
http://videlibri.sourceforge.net/xidel.html
<syntaxhighlight lang="sh">$ xidel -s "https://www.rosettacode.org/wiki/Talk:Web_scraping" -e '
//p[1]/text()[last()]
'
20:53, 20 August 2008 (UTC)
$ xidel -s "https://www.rosettacode.org/wiki/Talk:Web_scraping" -e '
x:parse-dateTime(//p[1]/text()[last()],'hh:nn, dd mmmm yyyy')
'
2008-08-20T20:53:00
$ xidel -s "https://www.rosettacode.org/wiki/Talk:Web_scraping" -e '
adjust-dateTime-to-timezone(
x:parse-dateTime(//p[1]/text()[last()],'hh:nn, dd mmmm yyyy'),
dayTimeDuration('PT0H')
)
'
$ xidel -s "https://www.rosettacode.org/wiki/Talk:Web_scraping" -e '
x:parse-dateTime(//p[1]/text()[last()],'hh:nn, dd mmmm yyyy')
! adjust-dateTime-to-timezone(.,dayTimeDuration('PT0H'))
'
$ xidel -s "https://www.rosettacode.org/wiki/Talk:Web_scraping" -e '
x:parse-dateTime(//p[1]/text()[last()],'hh:nn, dd mmmm yyyy')
=> adjust-dateTime-to-timezone(dayTimeDuration('PT0H'))
'
2008-08-20T20:53:00Z</syntaxhighlight>
=={{header|zkl}}==
<syntaxhighlight lang="zkl">const HOST="tycho.usno.navy.mil", PORT=80, dir="/cgi-bin/timer.pl";
get:="GET %s HTTP/1.0\r\nHost: %s:%s\r\n\r\n".fmt(dir,HOST,PORT);
server:=Network.TCPClientSocket.connectTo(HOST,PORT);
server.write(get); // send request to web serer
data:=server.read(True); // read data from web server
data.seek(data.find("UTC")); // middle of line
c:=data.seek(Void,0); // start of line
line:=data[c,data.seek(Void,1)-c].text;
line.print(); // the HTML UTC line
re:=RegExp(0'|.*(\d\d:\d\d:\d\d)|); // get time
re.search(line);
re.matched[1].println();</syntaxhighlight>
{{out}}
<pre>
<BR>Mar. 18, 06:18:31 UTC Universal Time
06:18:31
</pre>
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