ParseRequest Class

Article
07/12/2014

Provides information to execute a parsing operation in a language service.

This API is not CLS-compliant.

Inheritance Hierarchy

System.Object
Microsoft.VisualStudio.Package.ParseRequest

Namespace: Microsoft.VisualStudio.Package
Assemblies:   Microsoft.VisualStudio.Package.LanguageService (in Microsoft.VisualStudio.Package.LanguageService.dll)
  Microsoft.VisualStudio.Package.LanguageService.11.0 (in Microsoft.VisualStudio.Package.LanguageService.11.0.dll)
  Microsoft.VisualStudio.Package.LanguageService.9.0 (in Microsoft.VisualStudio.Package.LanguageService.9.0.dll)
  Microsoft.VisualStudio.Package.LanguageService.10.0 (in Microsoft.VisualStudio.Package.LanguageService.10.0.dll)

Syntax

'Declaration
<CLSCompliantAttribute(False)> _
Public Class ParseRequest

[CLSCompliantAttribute(false)]
public class ParseRequest

[CLSCompliantAttribute(false)]
public ref class ParseRequest

[<CLSCompliantAttribute(false)>]
type ParseRequest =  class end

public class ParseRequest

The ParseRequest type exposes the following members.

Constructors

	Name	Description
	ParseRequest(Boolean)	Initializes a new instance of the ParseRequest class in order to terminate the thread used for background parsing operations.
	ParseRequest(Int32, Int32, TokenInfo, String, String, ParseReason, IVsTextView, AuthoringSink, Boolean)	Initializes a new instance of the ParseRequest class.

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Properties

	Name	Description
	Callback	Specifies the callback delegate to be called when the parsing operation has completed.
	Col	Specifies the character offset on the first line to begin the parsing operation.
	DirtySpan	Specifies a span of source that has changed.
	FileName	Specifies the name of the source file being parsed.
	IsSynchronous	Gets or sets whether or not the request is synchronous.
	Line	Specifies the line on which to start the parsing operation.
	Reason	Specifies the reason the parsing operation was started.
	Scope	Specifies the AuthoringScope object that is used to return extended information from the parsing operation.
	Sink	Specifies an AuthoringSink object used to contain information from the parsing operation.
	Terminate	Specifies whether the worker thread handling background parsing operations should exit.
	Text	Specifies the source text to be parsed.
	Timestamp	Specifies a time stamp for the parse request.
	TokenInfo	Specifies a TokenInfo structure that is filled in with the results of the parsing operation.
	View	Specifies the IVsTextView object representing the view that contains the source that is being parsed.

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Methods

	Name	Description
	Equals	Determines whether the specified object is equal to the current object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Remarks

This class is used to communicate information to a parser about a particular parsing operation and to return information about the parsing operation. The source used by the parser is accessed as a single block of text through the Text property. This text is passed to the ParseRequest constructor.

Notes to Implementers

Everything a typical parsing operation needs can be found in this class so there should be no reason to derive from this class. However, if you do need to derive a class from the ParseRequest class, you must derive a class from the LanguageService class and override the CreateParseRequest method to instantiate your own version of the ParseRequest class.

Note that if your language service is going to support parsing variables for display in the Autos debugging window and/or support validation of breakpoints, you must derive a class from the AuthoringSink class and set the Sink property in an instance of the ParseRequest class to your version of the AuthoringSink class. This can be done in the CreateParseRequest method after the ParseRequest object is created.

Notes to Callers

This class is instantiated by a call to the CreateParseRequest method in the LanguageService class.

Do not attempt to use the View property in a background thread: the IVsTextView object is meant only for foreground use by the base Source class.

Examples

This example shows how to create a new ParseRequest object with a custom AuthoringSink object (the class for which is not shown).

using Microsoft.VisualStudio.Package;
using Microsoft.VisualStudio.TextManager.Interop;

namespace MyLanguagePackage
{
    class MyLanguageService : LanguageService
    {
        public ParseRequest CreateParseRequest(Source s, 
                                               int line, 
                                               int idx, 
                                               TokenInfo info, 
                                               string sourceText, 
                                               string fname, 
                                               ParseReason reason, 
                                               IVsTextView view)
        {
             ParseRequest req = new ParseRequest(line,
                                                 idx,
                                                 info,
                                                 sourceText,
                                                 fname,
                                                 reason,
                                                 view);
             if (req != null)
             {
                  req.Sink = new MyAuthoringSink(reason, line, idx);
             }
             return req;
         }
    }
}

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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