.NET 5.0 .NET Core 2.2 .NET Standard 2.0 .NET Framework 2.0
dotnet add package YaccLexTools.Gplex --version
NuGet\Install-Package YaccLexTools.Gplex -Version
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="YaccLexTools.Gplex" Version="" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add YaccLexTools.Gplex --version
#r "nuget: YaccLexTools.Gplex,"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install YaccLexTools.Gplex as a Cake Addin
#addin nuget:?package=YaccLexTools.Gplex&version=

// Install YaccLexTools.Gplex as a Cake Tool
#tool nuget:?package=YaccLexTools.Gplex&version=

Project Description

GPLEX is a scanner generator which produces lexical scanners written in C# V2 or higher. The input language is similar to the original LEX specification language, but allows full 21-bit Unicode scanners to be specified.

This repository now includes the full documentation for the scanner-generator.


GPLEX generates scanners based around finite state automata. The generated automata have the number of states minimized by default, and have a large number of options for table compression. The default compression scheme is chosen depending on the input alphabet cardinality, and almost always gives a reasonable result. However a large number of options are available for the user to tune the behavior if necessary.

The tool implements many of the FLEX extensions, including such things as start-state stacks.

The generated scanners are designed to interface cleanly with bottom-up parsers generated by Gardens Point Parser Generator. However, gplex-generated scanners have been successfully used with both handwritten parsers and with parsers generated by COCO/R.

Examples Of Use

There are a small number of examples of use included in the download package, and these are fully discussed in the documentation. For a more complex example GPLEX and the companion GPPG tool each themselves use scanners and parsers generated by GPLEX and GPPG. The examples described in the documentation for GPPG and GPLEX have now been added to the distribution as file GP-Examples.zip.

There is a separate documentation file that deals with the special issues that arise with scanners that use the Unicode character set.

Is GPLEX What You Need?

GPLEX is a scanner generator. It is intended to be used to generate scanners for compilers or other tools that process text. It picks out non-overlapping substrings from within a continuing input stream, and returns an integer token identification. It may also be used for other simple regular expression recognition tasks, but is not a replacement for the System.Text.RegularExpressions classes. It does not have built-in mechanisms for multiple substring capture or anything similar.

GPLEX has historically had an approximately 2-per-year release cycle. If there is some feature that fits within the broad intention of the tool and which you feel is missing ... raise an issue. If what you really want is a C# version of AWK then GPLEX isn't it, and the copyright notice explains the conditions under which you may use code of GPLEX to help you implement AWK.NET yourself.

Product Versions
.NET net5.0 net5.0-windows net6.0 net6.0-android net6.0-ios net6.0-maccatalyst net6.0-macos net6.0-tvos net6.0-windows net7.0 net7.0-android net7.0-ios net7.0-maccatalyst net7.0-macos net7.0-tvos net7.0-windows
.NET Core netcoreapp2.0 netcoreapp2.1 netcoreapp2.2 netcoreapp3.0 netcoreapp3.1
.NET Standard netstandard2.0 netstandard2.1
.NET Framework net20 net35 net40 net403 net45 net451 net452 net46 net461 net462 net463 net47 net471 net472 net48 net481
MonoAndroid monoandroid
MonoMac monomac
MonoTouch monotouch
Tizen tizen40 tizen60
Xamarin.iOS xamarinios
Xamarin.Mac xamarinmac
Xamarin.TVOS xamarintvos
Xamarin.WatchOS xamarinwatchos
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.
  • .NETCoreApp 2.2

    • No dependencies.
  • .NETCoreApp 3.1

    • No dependencies.
  • .NETFramework 2.0

    • No dependencies.
  • .NETStandard 2.0

    • No dependencies.
  • net5.0

    • No dependencies.
  • net6.0

    • No dependencies.

NuGet packages (1)

Showing the top 1 NuGet packages that depend on YaccLexTools.Gplex:

Package Downloads

This package includes GPPG 1.5.2 and GPLEX 1.2.2 tools for compiling YACC and LEX source files in your C# project.

GitHub repositories

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Version Downloads Last updated 8,266 5/3/2022