Class: Janeway::AST::RootNode

Inherits:
Expression show all
Defined in:
lib/janeway/ast/root_node.rb

Overview

Every JSONPath query (except those inside filter expressions; see Section 2.3.5) MUST begin with the root identifier $.

The root identifier $ represents the root node of the query argument and produces a nodelist consisting of that root node.

The root identifier may also be used in the filter selectors.

@example:

$(? $.key1 == $.key2 )

Instance Attribute Summary collapse

Attributes inherited from Expression

#value

Instance Method Summary collapse

Methods inherited from Expression

#indented, #initialize, #literal?, #type

Constructor Details

This class inherits a constructor from Janeway::AST::Expression

Instance Attribute Details

#next ⇒ Object

Subsequent expression that modifies the output of this expression



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# File 'lib/janeway/ast/root_node.rb', line 18

def next
  @next
end

Instance Method Details

#singular_query? ⇒ Boolean

True if this is the root of a singular-query.

Returns:

See Also:



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# File 'lib/janeway/ast/root_node.rb', line 28

def singular_query?
  return true unless @next # there are no following selectors

  selector_types = []
  selector = @next
  loop do
    selector_types << selector.class
    selector = selector&.next
    break unless selector
  end
  allowed = [AST::IndexSelector, AST::NameSelector]
  selector_types.uniq.all? { allowed.include?(_1) }
end

#to_s ⇒ Object 



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# File 'lib/janeway/ast/root_node.rb', line 20

def to_s
  "$#{@next}"
end

#tree(level = 0) ⇒ Array

Parameters:

  • level (Integer) (defaults to: 0)

Returns:

  • (Array) 


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# File 'lib/janeway/ast/root_node.rb', line 44

def tree(level = 0)
  [indented(level, '$'), @next.tree(level + 1)]
end