PLY (software): Difference between revisions

PLY (Python Lex-Yacc)
Original author(s)	David M. Beazley
Stable release	3.11
Repository	github.com/dabeaz/ply ;
Written in	Python
Website	dabeaz.com/ply/

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Latest revision as of 00:58, 18 October 2024

PLY is a parsing tool written purely in Python. It is, in essence, a re-implementation of Lex and Yacc originally in C-language. It was written by David M. Beazley. PLY uses the same LALR parsing technique as Lex and Yacc. It also has extensive debugging and error reporting facilities.^[1]

Features

Implemented in Python, it has almost all the features provided by Lex and Yacc. It includes support for empty productions, precedence rules, error recovery, and ambiguous grammars. It supports Python 3.

Structure the PLY module

PLY has the following two Python modules which are part of the ply package.^[2]

ply.lex - A re-implementation of Lex for lexical analysis
ply.yacc - A re-implementation of Yacc for parser creation

References

[off-1] "PLY Homepage".

[2] "Official Documentation".

[1]

[2]

@@ Line 1: / Line 1: @@
+{{Short description|Re-implementation of Lex and Yacc in Python}}
-{{otheruses|Ply (disambiguation)GKVKWMV;LMA}}
+{{Other uses|Ply (disambiguation)}}
-{{refimprove|date=April 2014}}
+{{More citations needed|date=April 2014}}
 {{Infobox software
 | name                   = PLY (Python Lex-Yacc)
@@ Line 23: / Line 23: @@
 }}
-'''PLY''' is a parsing tool written purely in [[Python (programming language)|Python]]. It is basically a re-implementation of [[Lex (software)|Lex]] and [[Yacc]] originally in [[C (programming language)|C-language]]. It was written by [[David M. Beazley]].<ref>{{cite web |url=/proxy/http://www.dabeaz.com/ply/|title=PLY Homepage}}</ref> Unlike Lex and Yacc in C which uses [[LALR parser|LALR]] parsing technique, PLY uses [[LR parser|LR]] parsing which can incorporate large [[Context-free grammar|grammars]] easily. PLY also has extensive debugging and error reporting facilities.
+'''PLY''' is a [[parsing]] tool written purely in [[Python (programming language)|Python]]. It is, in essence, a re-implementation of [[Lex (software)|Lex]] and [[Yacc]] originally in [[C (programming language)|C-language]]. It was written by [[David M. Beazley]]. PLY uses the same [[LALR]] parsing technique as Lex and Yacc. It also has extensive [[debugging]] and error reporting facilities.<ref name=off>{{cite web |url=/proxy/http://www.dabeaz.com/ply/|title=PLY Homepage}}</ref>
 ==Features==
-Implemented in Python, it has almost all the features provided by Lex and Yacc. It includes support for empty productions, precedence rules,error recovery, and [[ambiguous grammar]]s.
+Implemented in Python, it has almost all the features provided by Lex and Yacc. It includes support for empty productions, precedence rules, error recovery, and [[ambiguous grammar]]s. It supports Python 3.
-includes support for Python 3.0 and some other features.
-==Structure of a PLY file==
+==Structure the PLY module==
 PLY has the following two Python modules which are part of the ply package.<ref>{{cite web |url=/proxy/http://www.dabeaz.com/ply/ply.html#ply_nn2 |title=Official Documentation}}</ref>
-*'''ply.lex''' - This deals with the lexical analysis part.
+*'''ply.lex''' - A re-implementation of [[Lex (software)|Lex]] for lexical analysis
-*'''ply.yacc''' - This module is for creating a parser.
+*'''ply.yacc''' - A re-implementation of [[Yacc]] for parser creation
-These files contain the necessary modules.
 ==References==
 {{Reflist}}
+{{Authority control}}
 [[Category:Parser generators]]
-[[Category:Python software]]
+[[Category:Python (programming language) software]]
 [[Category:Lexical analysis]]