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From PEG to a practical parser

Transcribe Parsing Expression Grammar into a parser written in Java.

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This is a tool to transcribe Parsing Expression Grammar into a parser written in Java.

Parsing Expression Grammar (PEG) is a new way to specify recursive-descent parsers with limited backtracking. The use of backtracking lifts the LL(1) restriction usually imposed by top-down parsers. In addition, PEG can define parsers with integrated lexing.

Unlike some existing parser generators for PEG, the tool does not produce a complex and storage-hungry "packrat parser", but a collection of transparent recursive procedures. It is named "Mouse" to set it apart from pack rats.

An integral feature of "Mouse" is the mechanism for specifying semantics (also in Java). This makes "Mouse" a convenient tool if one needs an ad-hoc language processor. Being written in Java, the processor is operating-system independent.

Included in the package are PEGs for Java and C.

From PEG to a practical parser Web Site




Apache License V2.0


  • New in Version 1.8: an experimental tool, PEG Analyzer, to investigate effects of limited backtracking in PEG. Its use is explained in the project's web site, .


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