Web scraping: Difference between revisions
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→{{header|Wren}}: Changed to Wren S/H
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=={{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>
<syntaxhighlight lang="java">
import java.io.BufferedReader;
import java.io.IOException;
Line 1,043 ⟶ 1,066:
import java.net.URL;
public final class
public static void main(String[] aArgs) {
Line 2,215 ⟶ 2,238:
End If
Next</syntaxhighlight>
=={{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}}==
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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="
import "./pattern" for Pattern
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var CURLOPT_WRITEDATA = 10001
var BUFSIZE = 16384 * 4
foreign class Buffer {
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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.")
Line 2,271 ⟶ 2,316:
<br>
We now embed this in the following C program, compile and run it.
<syntaxhighlight lang="c">/* gcc
#include <stdio.h>
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WrenVM* vm = wrenNewVM(&config);
const char* module = "main";
const char* fileName = "
char *script = readFile(fileName);
WrenInterpretResult result = wrenInterpret(vm, module, script);
Line 2,447 ⟶ 2,492:
{{out}}
<pre>
20:
</pre>
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