Class: Dentaku::AST::Access

Inherits:
Node
  • Object
show all
Defined in:
lib/dentaku/ast/access.rb

Constant Summary

Constants inherited from Node

Node::STATIC_CONTEXT, Node::STATIC_MODE_KEY

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Node

#name, precedence, #pure?, resolve_class

Constructor Details

#initialize(data_structure, index) ⇒ Access

Returns a new instance of Access.



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# File 'lib/dentaku/ast/access.rb', line 21

def initialize(data_structure, index)
  @structure = data_structure
  @index = index
end

Instance Attribute Details

#index ⇒ Object (readonly)

Returns the value of attribute index.



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# File 'lib/dentaku/ast/access.rb', line 7

def index
  @index
end

#structure ⇒ Object (readonly)

Returns the value of attribute structure.



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# File 'lib/dentaku/ast/access.rb', line 7

def structure
  @structure
end

Class Method Details

.arity ⇒ Object 



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# File 'lib/dentaku/ast/access.rb', line 9

def self.arity
  2
end

.max_param_count ⇒ Object 



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# File 'lib/dentaku/ast/access.rb', line 17

def self.max_param_count
  arity
end

.min_param_count ⇒ Object 



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# File 'lib/dentaku/ast/access.rb', line 13

def self.min_param_count
  arity
end

Instance Method Details

#accept(visitor) ⇒ Object 



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# File 'lib/dentaku/ast/access.rb', line 50

def accept(visitor)
  visitor.visit_access(self)
end

#dependencies(context = {}) ⇒ Object 



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# File 'lib/dentaku/ast/access.rb', line 42

def dependencies(context = {})
  @structure.dependencies(context) + @index.dependencies(context)
end

#type ⇒ Object 



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# File 'lib/dentaku/ast/access.rb', line 46

def type
  nil
end

#value(context = {}) ⇒ Object 



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# File 'lib/dentaku/ast/access.rb', line 26

def value(context = {})
  structure = @structure.value(context)
  index = @index.value(context)

  unless structure.respond_to?(:[]) && !structure.is_a?(::Numeric)
    raise Dentaku::ArgumentError.for(:incompatible_type, actual: structure),
          "#{self.class} requires an indexable structure, but got #{structure.class}"
  end

  begin
    structure[index]
  rescue ::TypeError => e
    raise Dentaku::ArgumentError.for(:incompatible_type, actual: index), e.message
  end
end