Can someone help me understand this grammar?

StackOverflow https://stackoverflow.com/questions/23300129

  •  09-07-2023
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Question

I can't understand these grammar rules, and what the "returns" and "current" keywords means ?

WhereEntry returns WhereEntry:
AndWhereEntry ({OrWhereEntry.entries+=current} 
    ("OR" entries+=AndWhereEntry)+)?
;
Was it helpful?

Solution

  1. returns means: the result of the rule will be of type WhereEntry.
  2. current means: the object parsed so far.

In sum this will mean

  • AndWhereEntry is a Subclass of WhereEntry.
  • if there is an OR then the AndWhereEntry parsed before will be added to the OrWhereEntry entries list.
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