PEG scannerless parser generator for Java 8
- A Java parser generator like JavaCC based on Parsing Expression Grammar.
- Outputs pure Java scannerless parser with cache functionality.
- Enables hybrid grammar description by parser class inheritance.
- Eclipse plugin to coloring grammar is available.
- Grammar reference is available here.
- Parser generator requires Java 8 to execute.
- Output parser class may run on Java 7 unless it includes Java 8 features in action code.
- JavaPEGPlugin.zip --- Eclipse plugin
To install: put jar file in 'plugins' folder. - package parser
- Generator.java --- Parser generator
- GeneratorHelper.java --- Helper class for parser generator
- Parser.java --- Runtime helper class inherited by output parser
- Generator.peg --- Grammar file to create Generator.java
- package parser.bootstrap
- LL1Generator.jj --- JavaCC grammar to create Generator.java
- package sample
- Base.peg --- Simple calculator sample grammar
- Base.java --- Generated parser
- Derived.peg --- Variable assignment extension grammar
- Derived.java --- Generated parser extends Base.java
- Just invoke main function of Generator.java, then file chooser dialog will appear.
- Choosing grammar file starts the generation.
- In Eclipse environment, do refresh (F5) and then you can see the created Java file.
- When generating derived parser (e.g. Derived.java), base parser (e.g. Base.java) must be created beforehand.
- The generator does not fine check for input grammar.
- Left recursion is not checked and may result in stack overflow.
- Inappropriate grammar like
( symbol? )*is not checked and may result in infinite loop at runtime.