Class: Janeway::Interpreters::FilterSelectorDeleter

Inherits:
FilterSelectorInterpreter show all
Defined in:
lib/janeway/interpreters/filter_selector_deleter.rb

Overview

Interprets a filter selector, and deletes matching values

Constant Summary

Constants inherited from Base

Base::NOTHING

Instance Attribute Summary

Attributes inherited from Base

#next, #node

Instance Method Summary collapse

Methods inherited from FilterSelectorInterpreter

#as_json, #initialize, #interpret, setup_interpreter_tree

Methods inherited from Base

#as_json, #initialize, #interpret, #selector, #to_s, #type

Constructor Details

This class inherits a constructor from Janeway::Interpreters::FilterSelectorInterpreter

Instance Method Details

#interpret_array(input, root, _path) ⇒ Object

Interpret selector on the input.

Parameters:

  • input (Array) —

    the results of processing so far

  • root (Array, Hash) —

    the entire input

  • _path (Array<String>) —

    elements of normalized path to the current input



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# File 'lib/janeway/interpreters/filter_selector_deleter.rb', line 38

def interpret_array(input, root, _path)
  # Apply filter expressions to the input data
  results = []

  # Iterate in reverse order so that deletion does not alter the remaining indexes
  i = input.size
  input.reverse_each do |value|
    i -= 1 # calculate array index

    # Run filter and interpret result
    result = @expr.interpret(value, nil, root, [])
    case result
    when TrueClass then results << value # comparison test - pass
    when FalseClass then next # comparison test - fail
    when Array
      next if result.empty?

      results << value # existence test - node list
    else
      results << value # existence test. Null values here == success.
    end
    input.delete_at(i)
  end
  results.reverse
end

#interpret_hash(input, root, _path) ⇒ Object

Interpret selector on the input.

Parameters:

  • input (Hash) —

    the results of processing so far

  • root (Array, Hash) —

    the entire input

  • _path (Array<String>) —

    elements of normalized path to the current input



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# File 'lib/janeway/interpreters/filter_selector_deleter.rb', line 13

def interpret_hash(input, root, _path)
  # Apply filter expressions to the input data
  results = []
  input.each do |key, value|
    # Run filter and interpret result
    result = @expr.interpret(value, nil, root, [])
    case result
    when TrueClass then results << value # comparison test - pass
    when FalseClass then next # comparison test - fail
    when Array
      next if result.empty?

      results << value # existence test - node list
    else
      results << value # existence test. Null values here == success.
    end
    input.delete(key)
  end
  results
end