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

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 Method Details

#singular_query? ⇒ Boolean

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

Returns:

See Also:



25
26
27
28
29
30
31
32
33
34
35
36
37
 
# File 'lib/janeway/ast/root_node.rb', line 25

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

  selector_types = []
  selector = @value
  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 



17
18
19
 
# File 'lib/janeway/ast/root_node.rb', line 17

def to_s
  "$#{@value}"
end

#tree(level = 0) ⇒ Array

Parameters:

  • (defaults to: 0)

Returns:



41
42
43
 
# File 'lib/janeway/ast/root_node.rb', line 41

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