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// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
namespace WixToolset.Preprocess
{
using System;
/// <summary>
/// Current state of the if context.
/// </summary>
internal enum IfState
{
/// <summary>Context currently in unknown state.</summary>
Unknown,
/// <summary>Context currently inside if statement.</summary>
If,
/// <summary>Context currently inside elseif statement..</summary>
ElseIf,
/// <summary>Conext currently inside else statement.</summary>
Else,
}
/// <summary>
/// Context for an if statement in the preprocessor.
/// </summary>
internal sealed class IfContext
{
private bool active;
private bool keep;
private bool everKept;
private IfState state;
/// <summary>
/// Creates a default if context object, which are used for if's within an inactive preprocessor block
/// </summary>
public IfContext()
{
this.active = false;
this.keep = false;
this.everKept = true;
this.state = IfState.If;
}
/// <summary>
/// Creates an if context object.
/// </summary>
/// <param name="active">Flag if context is currently active.</param>
/// <param name="keep">Flag if context is currently true.</param>
/// <param name="state">State of context to start in.</param>
public IfContext(bool active, bool keep, IfState state)
{
this.active = active;
this.keep = keep;
this.everKept = keep;
this.state = state;
}
/// <summary>
/// Gets and sets if this if context is currently active.
/// </summary>
/// <value>true if context is active.</value>
public bool Active
{
get { return this.active; }
set { this.active = value; }
}
/// <summary>
/// Gets and sets if context is current true.
/// </summary>
/// <value>true if context is currently true.</value>
public bool IsTrue
{
get
{
return this.keep;
}
set
{
this.keep = value;
if (this.keep)
{
this.everKept = true;
}
}
}
/// <summary>
/// Gets if the context was ever true.
/// </summary>
/// <value>True if context was ever true.</value>
public bool WasEverTrue
{
get { return this.everKept; }
}
/// <summary>
/// Gets the current state of the if context.
/// </summary>
/// <value>Current state of context.</value>
public IfState IfState
{
get { return this.state; }
set { this.state = value; }
}
}
}
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