Xtext

Xtext is a grammar language created in 2006.

Source code:

git clone https://github.com/eclipse/xtext

#459on PLDB

18Years Old

Xtext is an open-source software framework for developing programming languages and domain-specific languages (DSLs). Unlike standard parser generators, Xtext generates not only a parser, but also a class model for the abstract syntax tree, as well as providing a fully featured, customizable Eclipse-based IDE.Xtext is being developed in the Eclipse Project as part of the Eclipse Modeling Framework Project and is licensed under the Eclipse Public License.. Read more on Wikipedia...

Xtext website
Xtext Wikipedia page
Xtext is developed on GitHub and has 645 stars
file extensions for Xtext include xtext
Xtext on Twitter
Read more about Xtext on the web: 1.

Example from the web:

grammar org.eclipse.xtext.common.Terminals 
    hidden(WS, ML_COMMENT, SL_COMMENT)
 
import "http://www.eclipse.org/emf/2002/Ecore" as ecore
 
terminal ID: 
    '^'?('a'..'z'|'A'..'Z'|'_')('a'..'z'|'A'..'Z'|'_'|'0'..'9')*;
 
terminal INT returns ecore::EInt: 
    ('0'..'9')+;
 
terminal STRING: 
    '"' ( '\\'('b'|'t'|'n'|'f'|'r'|'u'|'"'|"'"|'\\') | !('\\'|'"') )* '"' |
    "'" ( '\\'('b'|'t'|'n'|'f'|'r'|'u'|'"'|"'"|'\\') | !('\\'|"'") )* "'";
 
terminal ML_COMMENT: 
    '/*' -> '*/';
 
terminal SL_COMMENT: 
    '//' !('\n'|'\r')* ('\r'? '\n')?;
 
terminal WS: 
    (' '|'\t'|'\r'|'\n')+;
 
terminal ANY_OTHER: 
    .;

Feature	Supported	Token	Example
Mixins	✓		grammar org.example.domainmodel.Domainmodel with org.eclipse.xtext.common.Terminals
File Imports	✓		import "http://www.xtext.org/example/Domainmodel" import "http://www.xtext.org/example/Domainmodel" as dmodel

Xtext - Grammar language

Language features