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SimpleRule is a named rule that sorts out context-free grammar. It supports  direct and indirect right recursion. Left recursion is not supported.  The (*and+) loops are supported as well.  

Each SimpleRule declaration also describes an AST node (class). An AST class may contain one or more fields which are calculated according to the grammar (defined by RuleExpression).   A field is created for each sub-rule in RuleExpression. Field names are created automatically or by an author of the grammar. See the “AST fields” section for details.


This rule describes JSON property. Key and Value refer to the other rules that should be either declared in the same syntax module or imported from other modules.

SimpleRuleBody may contain:

  • declarations of other nested rules
  • rule aliases
  • methods

See “SimpleRuleBodyMember “ for details.

See also


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