![]() Since PLY was primarily developed as an instructional tool, you willįind it to be fairly picky about token and grammar ruleĪdded formality is meant to catch common programming mistakes made by PLY-3.0 represents a major refactoring of the original implementation Since 2001, PLY hasĬontinued to be improved as feedback has been received from users. ![]() Usability problems encountered by students. Most of PLY's interface and operation has been influenced by common Nested scoping, and code generation for the SPARC processor.Īpproximately 30 different compiler implementations were completed in Include lexical analysis, parsing, type checking, type inference, Their compiler, implemented entirely in Python, had to Students built a fully functional compiler for a simple Pascal-like If you've used yacc in another programming language, it should beĮarly versions of PLY were developed to support an Introduction toĬompilers Course I taught in 2001 at the University of Chicago. This includes supporting LALR(1) parsing as well as providingĮxtensive input validation, error reporting, and diagnostics. The main goal of PLY is to stayįairly faithful to the way in which traditional lex/yacc tools work. PLY is a pure-Python implementation of the popular compilerĬonstruction tools lex and yacc. Works with versions as far back as Python 2.2, some of its optional features Using Python 2, you should try to use Python 2.4 or newer. Python 3 support is new and has not been extensively tested (althoughĪll of the examples and unit tests pass under Python 3.0). PLY-3.0 is compatible with both Python 2 and Python 3. That you read (or at least skim) this entire document before jumping Given the intrinsic complexity of parsing, I would strongly advise This document provides an overview of lexing and parsing with PLY. ![]() Debugging the lex() and yacc() commands.Recovery and resynchronization with error rules.Conditional lexing and start conditions.Line numbers and positional information.
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