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Utilities for abstract syntax trees and parsing with PLY.

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Bare essentials for building abstract syntax trees (AST) and Python lex-yacc ([PLY]( parsers. The package includes:

  • two classes for tree nodes: Terminal, Operator

  • a Lexer and Parser class, and a helper function to erase and rewrite the table files.

The examples under examples/ demonstrate how to use these classes to create a richer AST, a parser, and different backends that use the same parser.

These classes provide the boilerplate for parsing with PLY, and are based on code that was developed in [tulip]( and [promela](


[BSD-3](, see file LICENSE.

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