Class: Janeway::AST::FilterSelector

Inherits:
Selector show all
Defined in:
lib/janeway/ast/filter_selector.rb

Overview

Filter selectors may use function extensions, which are covered in Section 2.4. Within the logical expression for a filter selector, function expressions can be used to operate on nodelists and values. The set of available functions is extensible, with a number of functions predefined (see Section 2.4) and the ability to register further functions provided by the “Function Extensions” subregistry (Section 3.2). When a function is defined, it is given a unique name, and its return value and each of its parameters are given a _declared type_. The type system is limited in scope; its purpose is to express restrictions that, without functions, are implicit in the grammar of filter expressions. The type system also guides conversions (Section 2.4.2) that mimic the way different kinds of expressions are handled in the grammar when function expressions are not in use.

@example: $.store[@.price < 10]

Instance Attribute Summary

Attributes inherited from Selector

#next

Attributes inherited from Expression

#next, #value

Instance Method Summary collapse

Methods inherited from Selector

#==

Methods inherited from Expression

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

Constructor Details

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

Instance Method Details

#to_s(brackets: true) ⇒ Object

** ignores keyword arguments that don’t apply to this selector

Parameters:

  • brackets (Boolean) (defaults to: true) —

    include brackets around selector



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# File 'lib/janeway/ast/filter_selector.rb', line 52

def to_s(brackets: true, **)
  brackets ? "[?#{value}]#{@next}" : "?#{value}#{@next}"
end

#tree(level) ⇒ Array

Parameters:

  • level (Integer)

Returns:

  • (Array) 


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# File 'lib/janeway/ast/filter_selector.rb', line 58

def tree(level)
  if @next
    [indented(level, to_s), @next.tree(level + 1)]
  else
    [indented(level, to_s)]
  end
end