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Calculations provide means of retrieving or calculating data from parsed text in a way that is suitable for parse result:

  • when implemented in injected language do not require AST building and thus can be much more efficient in many cases.
  • can handle error states (missing or errorneous nodes) in a natural way
  • are integrated with grammar extensibility and syntax structure
  • provide means for effective memoization (caching) and other optimizations
  • provide means for validation of completeness (static per syntax module, dynamic per parser)

External calculations by Vlad
External calculations by Ilya

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