Class: Janeway::Interpreters::FilterSelectorDeleteIf

Inherits:
FilterSelectorInterpreter show all
Includes:
IterationHelper
Defined in:
lib/janeway/interpreters/filter_selector_delete_if.rb

Overview

Interprets a filter selector by deleting matching values for which the block returns a truthy value

Constant Summary

Constants inherited from Base

Base::NOTHING

Instance Attribute Summary

Attributes inherited from Base

#next, #node

Instance Method Summary collapse

Methods included from IterationHelper

#make_yield_proc, #normalized_path

Methods inherited from FilterSelectorInterpreter

#as_json, #interpret, setup_interpreter_tree

Methods inherited from Base

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

Constructor Details

#initialize(selector, &block) ⇒ FilterSelectorDeleteIf 



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

def initialize(selector, &block)
  super(selector)
  @block = block

  # Make a proc that yields the correct number of values to a block
  @yield_proc = make_yield_proc(&block)
end

Instance Method Details

#interpret_array(input, root, path) ⇒ Object

Interpret selector on the input.



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# File 'lib/janeway/interpreters/filter_selector_delete_if.rb', line 48

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 FalseClass then next # comparison test - fail
    when Array then next if result.empty?
    end

    # filter test passed, next yield value to block
    next unless @yield_proc.call(value, input, path + [i])

    results << input.delete_at(i)
  end
  results.reverse
end

#interpret_hash(input, root, path) ⇒ Object

Interpret selector on the input.



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# File 'lib/janeway/interpreters/filter_selector_delete_if.rb', line 25

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 FalseClass then next # comparison test - fail
    when Array then next if result.empty?
    end

    # filter test passed, next yield value to block
    next unless @yield_proc.call(value, input, path + [key])

    results << input.delete(key)
  end
  results
end