Class: ShEx::Algebra::Start

Inherits:
Operator::Unary show all
Includes:
ShapeExpression
Defined in:
lib/shex/algebra/start.rb

Constant Summary collapse

NAME = 
:start

Constants inherited from Operator::Unary

Operator::Unary::ARITY

Constants inherited from Operator

Operator::ARITY

Instance Attribute Summary

Attributes inherited from Operator

#id, #logger, #operands, #options, #schema

Instance Method Summary collapse

Methods inherited from Operator::Unary

#initialize

Methods inherited from Operator

#base_uri, #closed?, #each_descendant, #eql?, #expression, #expressions, #focus, #focus=, from_shexj, #initialize, #inspect, #iri, iri, #json_type, #matched, #matched=, #message, #message=, #not_matched, #not_satisfied, #operand, #parent, #parent=, #satisfied, #satisfied=, #satisfy, #semact?, #semantic_actions, #serialize_value, #status, #structure_error, #to_h, #to_json, #to_sxp, #to_sxp_bin, #triple_expression?, #unmatched, #unmatched=, #unsatisfied, #unsatisfied=, value, #value

Constructor Details

This class inherits a constructor from ShEx::Algebra::Operator::Unary

Instance Method Details

#satisfies?(focus, depth: 0) ⇒ Boolean, ShapeExpression

Parameters:

  • focus (RDF::Resource)
  • depth (Integer) (defaults to: 0) —

    for logging

  • options (Hash{Symbol => Object}) —

    Other, operand-specific options

Returns:

  • (Boolean)
  • (ShapeExpression) —

    with ‘matched` and `satisfied` accessors for matched triples and sub-expressions

Raises:

  • (ShEx::NotMatched) —

    with ‘expression` accessor to access `matched` and `unmatched` statements along with `satisfied` and `unsatisfied` operations.



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# File 'lib/shex/algebra/start.rb', line 11

def satisfies?(focus, depth: 0)
  status "", depth: depth
  matched_op = case expression
  when RDF::Resource
    schema.enter_shape(expression, focus) do |shape|
      if shape
        shape.satisfies?(focus, depth: depth + 1)
      else
        status "Satisfy as #{expression} was re-entered for #{focus}", depth: depth
        nil
      end
    end
  when ShapeExpression
    expression.satisfies?(focus, depth: depth + 1)
  end
  satisfy focus: focus, satisfied: matched_op, depth: depth
rescue ShEx::NotSatisfied => e
  not_satisfied e.message, focus: focus, unsatisfied: e.expression, depth: depth
  raise
end

#validate! ⇒ Operator

expression must be a ShapeExpression

Returns:

Raises:



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# File 'lib/shex/algebra/start.rb', line 37

def validate!
  case expression
  when ShapeExpression
  when RDF::Resource
    ref = schema.find(expression)
    ref.is_a?(ShapeExpression) ||
    structure_error("#{json_type} must reference a ShapeExpression: #{ref}")
  else
    structure_error("#{json_type} must reference a ShapeExpression: #{ref}")
  end
  super
end