Class: Protein::Pointer

Inherits:
Object
  • Object
show all
Defined in:
lib/protein/pointer.rb

Instance Method Summary collapse

Constructor Details

#initialize(base, base_name = "context", input = nil) ⇒ Pointer

Returns a new instance of Pointer.



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# File 'lib/protein/pointer.rb', line 3

def initialize(base, base_name = "context", input = nil)
  @base = base
  @base_name = base_name

  if input.is_a?(String)
    parse(input)
  end
end

Instance Method Details

#dump ⇒ Object 



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# File 'lib/protein/pointer.rb', line 12

def dump
  @access_path || raise(ProcessingError, "pointer can't be empty")
end

#inspect_path ⇒ Object 



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# File 'lib/protein/pointer.rb', line 53

def inspect_path
  @access_values.each_with_index do |access_value, index|
    if index > 0
      accessor_type, accessor_key = @access_path[index - 1]
      puts "Accessing #{accessor_type} with key #{accessor_key.inspect}"
    end
    puts "At #{access_value.inspect}"
  end
end

#load(input) ⇒ Object 



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# File 'lib/protein/pointer.rb', line 16

def load(input)
  @access_path = input.map do |type, key|
    [type.to_sym, key]
  end

  traverse_access_path(traverse_values: false)

  self
end

#parse(input) ⇒ Object 



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# File 'lib/protein/pointer.rb', line 26

def parse(input)
  unless input =~ Regexp.new("^#{@base_name}")
    raise PointerError, "access path should start with `#{@base_name}`"
  end

  access_path = input.scan(/(\.(\w+))|(\[(\d+)\])|(\[['"](\w+)['"]\])/).map do |match|
    if (key = match[1])
      [:struct, key]
    elsif (key = match[3])
      [:repeated, key.to_i]
    elsif (key = match[5])
      [:map, key]
    end
  end

  if access_path.empty?
    raise PointerError, "access path should not be empty"
  end

  @access_path = access_path
  traverse_access_path
end

#to_s ⇒ Object 



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# File 'lib/protein/pointer.rb', line 49

def to_s
  @access_strings.join
end