Class: DataFiles::Autocompletion

Inherits:
Object
  • Object
show all
Defined in:
lib/data_files/autocompletion.rb

Overview

Provides attribute value autocompletion for the ActiveData methods where and find_by.

Defined Under Namespace

Classes: ParsedInput

Constant Summary collapse

ALLOWED_METHODS = 
%w[where find_by'].freeze
REGEX_OPENING_PARENTHESIS_OR_WHITESPACE = 
/\(|\s/.freeze

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Autocompletion

Returns a new instance of Autocompletion.



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# File 'lib/data_files/autocompletion.rb', line 15

def initialize
  Readline.completion_append_character = ''
  Readline.completion_proc = proc do
    parsed = parse_input(Readline.line_buffer)

    if parsed.valid?
      suggestions(
        parsed.klass_name,
        parsed.method_name,
        parsed.attribute_name,
        parsed.attribute_value
      )
    else
      []
    end
  end
end

Instance Method Details

#parse_input(input) ⇒ Object 



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# File 'lib/data_files/autocompletion.rb', line 33

def parse_input(input)
  klass_name, remainder = input.split('.')
  method_name, attribute_name, attribute_value = remainder&.split(REGEX_OPENING_PARENTHESIS_OR_WHITESPACE)
  attribute_name = attribute_name&.sub(':', '')&.strip
  attribute_value = attribute_value&.sub('"', '')&.sub('\'', '')

  ParsedInput.new(klass_name, method_name, attribute_name, attribute_value)
end

#suggestions(klass_name, method_name, attribute_name, attribute_value) ⇒ Object 



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# File 'lib/data_files/autocompletion.rb', line 42

def suggestions(klass_name, method_name, attribute_name, attribute_value)
  return [] unless Object.const_defined?(klass_name)
  return [] unless ALLOWED_METHODS.include?(method_name)

  values = Object.const_get(klass_name).data.collect do |item|
    item[attribute_name]
  end

  if attribute_value
    values.select { |value| value.to_s.start_with?(attribute_value) }
  else
    values
  end
end