Rosetta Code/Rank languages by popularity: Difference between revisions
Rosetta Code/Rank languages by popularity (view source)
Revision as of 18:13, 11 September 2023
, 8 months agoAdded Visual Basic .NET
(→{{header|C sharp|C#}}: Handle more that 500 languages and more than 999 tasks) |
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0 Examples - WML
0 Examples - VAX Assembly</pre>
=={{header|Visual Basic .NET}}==
Uses Web scrapping to get the information from the Languages category page - as this now shows the number of pages in each category with the non-task pages separated, there is no need to access other pages.<br>
It may be necessary to set the Security Protocol to Tls12 at the start of the Main method in order to run this - see the "Problem running the C# entry" section on the [[Talk:Rosetta Code/Count examples]] page.
<syntaxhighlight lang="vbnet">
Imports System.Collections
Imports System.Collections.Generic
Imports System.Net
Imports System.Text.RegularExpressions
Module RankLanguagesByPopularity
Private Class LanguageStat
Public name As String
Public count As Integer
Public Sub New(name As String, count As Integer)
Me.name = name
Me.count = count
End Sub
End Class
Private Function CompareLanguages(x As LanguageStat, y As languageStat) As Integer
Dim result As Integer = 0
If x IsNot Nothing Or y IsNot Nothing Then
If x Is Nothing Then
result = -1
ElseIf y Is Nothing
result = 1
Else
result = - x.count.CompareTo(y.count) ' Sort descending count
If result = 0 Then
result = x.name.CompareTo(y.name) ' Sort ascending name
End If
End If
End If
Return result
End Function
Public Sub Main(ByVal args As String())
Dim languages As New List(Of LanguageStat)
Dim basePage As String = "https://rosettacode.org/wiki/Category:Programming_Languages"
Dim nextPage As String = basePage
Dim nextPageEx = New RegEx("<a href=""/wiki/Category:Programming_Languages([?]subcatfrom=[^""]*)""")
Dim languageStatEx = _
New Regex(">([^<]+?)</a>[^<]*<span title=""Contains *[0-9,.]* *[a-z]*, *([0-9,.]*) *page")
Do While nextPage <> ""
Dim wc As New WebClient()
Dim page As String = wc.DownloadString(nextPage)
nextPage = ""
For Each link In nextPageEx.Matches(page)
nextPage = basePage & link.Groups(1).Value
Next link
For Each language In languageStatEx.Matches(page)
Dim lCount As Integer = 0
Dim lName As String = language.Groups(1).Value
Dim countText As String = language.Groups(2).Value.Replace(",", "").Replace(".", "")
If Not Integer.TryParse(countText, lCount)
Console.Out.WriteLine(lName & "Invalid page count: <<" & countText & ">>")
Else
languages.Add(New LanguageStat(lName, lCount))
End If
Next language
Loop
languages.Sort(AddressOf CompareLanguages)
Dim prevCount As Integer = -1
Dim prevPosition As Integer = -1
Dim position As Integer = 0
For Each stat As LanguageStat In languages
position += 1
If stat.count <> prevCount Then
prevPosition = position
prevCount = stat.Count
End If
Console.Out.WriteLine(prevPosition.ToString.PadLeft(4) & ": " &
stat.count.ToString.PadLeft(4) & " " & stat.name)
Next stat
End Sub
End Module
</syntaxhighlight>
{{out}}
Sample output as at 11th September 2023
<pre>
1: 1652 Phix
1: 1652 Wren
3: 1614 Julia
4: 1595 Raku
5: 1576 Nim
6: 1546 Go
7: 1531 Perl
8: 1470 Python
9: 1375 J
10: 1285 C
. . .
</pre>
=={{header|Wren}}==
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