Class: Dhall::TypeChecker::RecordProjectionByExpression

Inherits:
Object
  • Object
show all
Defined in:
lib/dhall/typecheck.rb

Instance Method Summary collapse

Constructor Details

#initialize(projection) ⇒ RecordProjectionByExpression

Returns a new instance of RecordProjectionByExpression.



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# File 'lib/dhall/typecheck.rb', line 661

def initialize(projection)
  @selector = projection.selector.normalize
  @project_by_expression = projection
  @project_by_keys = Dhall::RecordProjection.for(
    @project_by_expression.record,
    @selector.keys
  )
end

Instance Method Details

#annotate(context) ⇒ Object 



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# File 'lib/dhall/typecheck.rb', line 670

def annotate(context)
  TypeChecker.assert @selector, Dhall::RecordType,
                     "RecordProjectionByExpression on #{@selector.class}"

  TypeChecker.assert_type @project_by_keys, @selector,
                          "Type doesn't match #{@selector}",
                          context: context

  Dhall::TypeAnnotation.new(
    value: @project_by_expression,
    type:  @selector
  )
end