83 lines
2.9 KiB
VB.net
83 lines
2.9 KiB
VB.net
Imports System.Collections
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Imports System.Collections.Generic
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Imports System.Net
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Imports System.Text.RegularExpressions
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Module RankLanguagesByPopularity
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Private Class LanguageStat
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Public name As String
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Public count As Integer
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Public Sub New(name As String, count As Integer)
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Me.name = name
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Me.count = count
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End Sub
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End Class
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Private Function CompareLanguages(x As LanguageStat, y As languageStat) As Integer
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Dim result As Integer = 0
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If x IsNot Nothing Or y IsNot Nothing Then
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If x Is Nothing Then
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result = -1
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ElseIf y Is Nothing
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result = 1
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Else
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result = - x.count.CompareTo(y.count) ' Sort descending count
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If result = 0 Then
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result = x.name.CompareTo(y.name) ' Sort ascending name
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End If
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End If
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End If
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Return result
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End Function
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Public Sub Main(ByVal args As String())
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Dim languages As New List(Of LanguageStat)
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Dim basePage As String = "https://rosettacode.org/wiki/Category:Programming_Languages"
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Dim nextPage As String = basePage
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Dim nextPageEx = New RegEx("<a href=""/wiki/Category:Programming_Languages([?]subcatfrom=[^""]*)""")
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Dim languageStatEx = _
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New Regex(">([^<]+?)</a>[^<]*<span title=""Contains *[0-9,.]* *[a-z]*, *([0-9,.]*) *page")
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Do While nextPage <> ""
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Dim wc As New WebClient()
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Dim page As String = wc.DownloadString(nextPage)
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nextPage = ""
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For Each link In nextPageEx.Matches(page)
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nextPage = basePage & link.Groups(1).Value
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Next link
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For Each language In languageStatEx.Matches(page)
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Dim lCount As Integer = 0
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Dim lName As String = language.Groups(1).Value
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Dim countText As String = language.Groups(2).Value.Replace(",", "").Replace(".", "")
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If Not Integer.TryParse(countText, lCount)
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Console.Out.WriteLine(lName & "Invalid page count: <<" & countText & ">>")
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Else
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languages.Add(New LanguageStat(lName, lCount))
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End If
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Next language
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Loop
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languages.Sort(AddressOf CompareLanguages)
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Dim prevCount As Integer = -1
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Dim prevPosition As Integer = -1
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Dim position As Integer = 0
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For Each stat As LanguageStat In languages
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position += 1
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If stat.count <> prevCount Then
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prevPosition = position
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prevCount = stat.Count
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End If
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Console.Out.WriteLine(prevPosition.ToString.PadLeft(4) & ": " &
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stat.count.ToString.PadLeft(4) & " " & stat.name)
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Next stat
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End Sub
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End Module
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