Undefine

This operator allows to undefine a nonterminal, i.e., remove all its production rules. The nonterminal must have using occurrences elsewhere than just in its own definition. If there are no such using occurrences, then the less disruptive eliminate operator is to be used.

Syntax

undefine:
        nonterminal+

Relevant files

• shared/prolog/xbgf1.pro
• shared/prolog/xbgf2.pro
• shared/rascal/src/transform/library/Productions.rsc
• shared/xsd/xbgf.xsd

See also

• Undefine is a part of XBGF

Contributors

• Ralf Lämmel (@rlaemmel)
• Vadim Zaytsev (@grammarware)