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A lexical analyzer generator that makes the class source code.

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ULS is a class library for creating lexical analyzer from language specification file. It's provided as C/C++/C# and Java (class) libraries with a few of tools on Linux/Windows platform.

ULS Web Site


  • Can instantiate multiple objects for one language or other languages in one application
  • Can tokenize the input file which encoded by UTF-8, UTF-16, UTF-32 as well as ASCII.
  • Can store the tokens from many input files to a uls-file(*.uls), which can be replayed and
  • Can be used as a replacement of 'lex/flex' for token-provider to yacc/bison parser.
  • As ULS manipulates real or integer numbers having arbitrary number of digits.
  • Can map the tokens that you define to any number of all range of 32-integer,


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Intended Audience

Non-Profit Organizations, Developers

User Interface


Programming Language

C#, C++, C, Java



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