' Gambas class file

''' Assertions which print TAP.

Export
Create Static

Public Struct Subtest
    Printer As TapPrinter
    Description As String
    Indent As Integer
    Success As Boolean
    ' Directive to apply to the next "ok" line
    Directive As Integer
    Comment As String
End Struct

Private $aActiveTests As New Subtest[]
Private $hCurrent As New Subtest

Public Sub _new()

    With $hCurrent = New Subtest
        .Printer = New TapPrinter As "Printer"
        .Indent = 0
        .Success = True
        .Directive = Tap.NONE
    End With

End

Public Sub Setup(Optional Tests As Integer, Optional Comment As String, Optional {Output} As Stream)

    If IsMissing({Output}) Then
        {Output} = $hCurrent.Printer.Output
        If Not {Output} Then {Output} = File.Out
    Endif
    $hCurrent.Printer.Output = {Output}
    Plan(Tests, Comment)

End

Public Sub Subtest(Description As String, Optional Tests As Integer)

    Dim iIndent As Integer = $hCurrent.Indent

    $aActiveTests.Push($hCurrent)
    With $hCurrent = New Subtest
        .Printer = New TapPrinter As "Printer"
        .Description = Description
        .Indent = iIndent + 1
        .Success = True
        .Directive = Tap.NONE
    End With
    If Tests Then Plan(Tests)

End

Public Sub Finish()

    Dim hFinished As Subtest

    $hCurrent.Printer.Finish()
    hFinished = $hCurrent
    Try $hCurrent = $aActiveTests.Pop()
    If Not Error Then
        $hCurrent.Printer.Test(hFinished.Success,, hFinished.Description)
    Endif

End

Public Sub Printer_Filter()

    Last.Line = String$($hCurrent.Indent, "\t") & Last.Line

End

Public Sub Plan(Tests As Integer, Optional Comment As String)

    $hCurrent.Printer.Plan(Tests, Comment)

End

Public Sub Ok(Result As Boolean, Optional Description As String) As Boolean

    With $hCurrent
        If .Directive <> Tap.NONE Then
            .Printer.Test(Result,, Description, .Directive, .Comment)
        Else
            .Printer.Test(Result,, Description)
            .Success = .Success And Result
        Endif
        .Directive = Tap.NONE
        .Comment = Null
    End With
    Return Result

End

Public Sub Todo(Optional Comment As String)

    $hCurrent.Directive = Tap.TODO
    $hCurrent.Comment = Comment

End

Public Sub Skip(Optional Comment As String)

    $hCurrent.Directive = Tap.SKIP
    $hCurrent.Comment = Comment
    Ok(True)

End

Public Sub Diagnostic(Comment As String)

    $hCurrent.Printer.Diagnostic(Comment)

End

Public Sub Note(Comment As String)

    Diagnostic(Comment)

End

Public Sub Print({Line} As String)

    $hCurrent.Printer.Print({Line})

End

' -------------------- High-level test functions --------------------

Public Sub Pass(Optional Description As String) As Boolean

    Return Ok(True, Description)

End

Public Sub Fail(Optional Description As String) As Boolean

    Return Ok(False, Description)

End

Public Sub NotOk(Result As Boolean, Optional Description As String) As Boolean

    Return Ok(Not Result, Description)

End

Public Sub Equals(Got As Variant, Expected As Variant, Optional Description As String) As Boolean

    Return Ok(Got = Expected, Description)

End

Public Sub NotEquals(Got As Variant, UnExpected As Variant, Optional Description As String) As Boolean

    Return Ok(Got <> UnExpected, Description)

End

Public Sub LessEqual(Got As Variant, Bound As Variant, Optional Description As String) As Boolean

    Return Ok(Got <= Bound, Description)

End

Public Sub Less(Got As Variant, Bound As Variant, Optional Description As String) As Boolean

    Return Ok(Got < Bound, Description)

End

Public Sub GreaterEqual(Got As Variant, Bound As Variant, Optional Description As String) As Boolean

    Return Ok(Got >= Bound, Description)

End

Public Sub Greater(Got As Variant, Bound As Variant, Optional Description As String) As Boolean

    Return Ok(Got > Bound, Description)

End

Public Sub Approximate(Got As Float, Expected As Float, Precision As Float, Optional Description As String) As Boolean

    Return Ok(Abs(Got - Expected) <= Precision, Description)

End

Public Sub RelativeApproximate(Got As Float, Expected As Float, RelPrecision As Float, Optional Description As String) As Boolean

    Return Ok(Abs((Got - Expected) / Expected) <= RelPrecision, Description)

End

Public Sub IsType(Got As Variant, Type As Integer, Optional Description As String) As Boolean

    Return Ok(TypeOf(Got) = Type, Description)

End

Public Sub Null(Got As Variant, Optional Description As String) As Boolean

    Return Equals(Got, Null, Description)

End

Public Sub NotNull(Got As Variant, Optional Description As String) As Boolean

    Return NotEquals(Got, Null, Description)

End

Public Sub Like(Got As String, Pattern As String, Optional Description As String) As Boolean

    Return Ok(Got Like Pattern, Description)

End

Public Sub Match(Got As String, Pattern As String, Optional Description As String) As Boolean

    Return Ok(Got Match Pattern, Description)

End

Public Sub StringEquals(Got As String, Expected As String, Optional Description As String) As Boolean

    Dim bRes As Boolean
    Dim iPos As Integer

    bRes = Equals(Got, Expected, Description)
    If Not bRes Then
        If Len(Got) <> Len(Expected) Then
            Note(("Strings are of different length."))
            Note(Subst$(("  Got:      &1"), Len(Got)))
            Note(Subst$(("  Expected: &1"), Len(Expected)))
        Endif
        For iPos = 1 To Min(Len(Got), Len(Expected))
            If Mid$(Got, iPos, 1) <> Mid$(Expected, iPos, 1) Then Break
        Next
        Note(Subst$(("Strings differ at position &1"), iPos))
        Note(Subst$(("  Got:      &1"), Quote$(Mid$(Got, iPos, 20)) & IIf(Len(Got) > iPos + 20, "...", "")))
        Note(Subst$(("  Expected: &1"), Quote$(Mid$(Expected, iPos, 20)) & IIf(Len(Expected) > iPos + 20, "...", "")))
    Endif
    Return bRes

End

Public Sub Error(Optional Description As String) As Boolean

    Return Ok( Error , Description)

End

Public Sub ErrorCode(Code As Integer, Optional Description As String) As Boolean

    Dim bRes As Boolean

    If Not Error Then
        bRes = Fail(Description)
        Note(("No error happened"))
    Else
        bRes = Equals(Error.Code, Code)
        If Not bRes Then
            Note(Subst$(("Error was: &1 (code: &2) at &3"), Error.Text, Error.Code, Error.Where))
        Endif
    Endif

    Error.Clear()
    Return bRes

End

Public Sub NotError(Optional Description As String) As Boolean

    Dim bRes As Boolean

    bRes = Ok(Not Error , Description)
    If Not bRes Then
        Note(Subst$(("Error was: &1 (code: &2) at &3"), Error.Text, Error.Code, Error.Where))
    Endif

    Error.Clear()
    Return bRes

End