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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.Extensibility
{
using System.Xml.Linq;
using WixToolset.Data;
/// <summary>
/// Base class for creating a preprocessor extension.
/// </summary>
public abstract class PreprocessorExtension : IPreprocessorExtension
{
/// <summary>
/// Gets or sets the preprocessor core for the extension.
/// </summary>
/// <value>Preprocessor core for the extension.</value>
public IPreprocessorCore Core { get; set; }
/// <summary>
/// Gets or sets the variable prefixes for the extension.
/// </summary>
/// <value>The variable prefixes for the extension.</value>
public virtual string[] Prefixes
{
get { return null; }
}
/// <summary>
/// Called at the beginning of the preprocessing of a source file.
/// </summary>
public virtual void Initialize()
{
}
/// <summary>
/// Gets the value of a variable whose prefix matches the extension.
/// </summary>
/// <param name="prefix">The prefix of the variable to be processed by the extension.</param>
/// <param name="name">The name of the variable.</param>
/// <returns>The value of the variable or null if the variable is undefined.</returns>
public virtual string GetVariableValue(string prefix, string name)
{
return null;
}
/// <summary>
/// Evaluates a function defined in the extension.
/// </summary>
/// <param name="prefix">The prefix of the function to be processed by the extension.</param>
/// <param name="function">The name of the function.</param>
/// <param name="args">The list of arguments.</param>
/// <returns>The value of the function or null if the function is not defined.</returns>
public virtual string EvaluateFunction(string prefix, string function, string[] args)
{
return null;
}
/// <summary>
/// Processes a pragma defined in the extension.
/// </summary>
/// <param name="sourceLineNumbers">The location of this pragma's PI.</param>
/// <param name="prefix">The prefix of the pragma to be processed by the extension.</param>
/// <param name="pragma">The name of the pragma.</param>
/// <param name="args">The pragma's arguments.</param>
/// <param name="parent">The parent node of the pragma.</param>
/// <returns>false if the pragma is not defined.</returns>
/// <comments>Don't return false for any condition except for unrecognized pragmas. Throw errors that are fatal to the compile. use core.OnMessage for warnings and messages.</comments>
public virtual bool ProcessPragma(SourceLineNumber sourceLineNumbers, string prefix, string pragma, string args, XContainer parent)
{
return false;
}
/// <summary>
/// Preprocess a document after normal preprocessing has completed.
/// </summary>
/// <param name="document">The document to preprocess.</param>
public virtual void PreprocessDocument(XDocument document)
{
}
/// <summary>
/// Preprocesses a parameter.
/// </summary>
/// <param name="name">Name of parameter that matches extension.</param>
/// <returns>The value of the parameter after processing.</returns>
/// <remarks>By default this method will cause an error if its called.</remarks>
public virtual string PreprocessParameter(string name)
{
return null;
}
/// <summary>
/// Called at the end of the preprocessing of a source file.
/// </summary>
public virtual void Finish()
{
}
}
}
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