Class: Dorian::Arguments

Inherits:
Object
  • Object
show all
Defined in:
lib/dorian/arguments.rb

Constant Summary collapse

BOOLEAN = 
"boolean"
STRING = 
"string"
NUMBER = 
"number"
INTEGER = 
"integer"
DECIMAL = 
"decimal"
DEFAULT_MULTIPLE = 
false
DEFAULT_ALIASES = 
[]
DEFAULT_TYPE = 
BOOLEAN
TYPES = 
[BOOLEAN, STRING, NUMBER, INTEGER, DECIMAL]
DEFAULTS = 
{
  BOOLEAN => "false",
  STRING => "",
  NUMBER => "0",
  INTEGER => "0",
  DECIMAL => "0"
}
MATCHES = 
{
  BOOLEAN => /^(true|false)$/i,
  STRING => /^.+$/i,
  NUMBER => /^[0-9.]+$/i,
  INTEGER => /^[0-9]+$/i,
  DECIMAL => /^[0-9.]+$/i
}
BOOLEANS = 
{ "true" => true, "false" => false }

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(**definition) ⇒ Arguments

Returns a new instance of Arguments.



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# File 'lib/dorian/arguments.rb', line 43

def initialize(**definition)
  @definition = definition
end

Instance Attribute Details

#definition ⇒ Object (readonly)

Returns the value of attribute definition.



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# File 'lib/dorian/arguments.rb', line 11

def definition
  @definition
end

Class Method Details

.parse ⇒ Object 



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# File 'lib/dorian/arguments.rb', line 47

def self.parse(...)
  new(...).parse
end

Instance Method Details

#cast(type, value) ⇒ Object 



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# File 'lib/dorian/arguments.rb', line 101

def cast(type, value)
  if type == BOOLEAN
    BOOLEANS.fetch(value.downcase)
  elsif type == INTEGER
    value.to_i
  elsif type == DECIMAL || type == NUMBER
    value.to_d
  else
    value
  end
end

#help ⇒ Object 



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# File 'lib/dorian/arguments.rb', line 113

def help
  message = "USAGE: #{$PROGRAM_NAME}\n"

  message += "\n" if definition.any?

  definition.each do |key, value|
    type, default, aliases = normalize(value)

    keys_message =
      ([key] + aliases)
        .map(&:to_s)
        .map(&:parameterize)
        .map { |key| key.size == 1 ? "-#{key}" : "--#{key}" }
        .join("|")

    message +=
      "  #{keys_message} #{type.upcase}, default: #{cast(type, default).inspect}\n"
  end

  message
end

#normalize(value) ⇒ Object 



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# File 'lib/dorian/arguments.rb', line 135

def normalize(value)
  if value.is_a?(Hash)
    type = value[:type]&.to_s || DEFAULT_TYPE
    default = value[:default]&.to_s || DEFAULTS.fetch(type)
    aliases =
      Array.wrap(
        value[:alias]&.to_s || value[:aliases]&.map(&:to_s) ||
          DEFAULT_ALIASES
      )
  else
    type = value.to_s
    default = DEFAULTS.fetch(type)
    aliases = DEFAULT_ALIASES
  end

  [type, default, aliases]
end

#parse ⇒ Object 



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# File 'lib/dorian/arguments.rb', line 51

def parse
  arguments = ARGV
  options = {}
  files = []

  definition.each do |key, value|
    type, default, aliases = normalize(value)

    keys = ([key] + aliases).map(&:to_s).map(&:parameterize)
    keys = keys.map { |key| ["--#{key}", "-#{key}"] }.flatten

    indexes = []

    values =
      arguments
        .map
        .with_index do |argument, index|
          if keys.include?(argument.split("=").first)
            indexes << index

            if argument.include?("=")
              argument.split("=", 2).last
            elsif arguments[index + 1].to_s =~ MATCHES.fetch(type)
              indexes << index + 1

              arguments[index + 1]
            elsif type == BOOLEAN
              "true"
            else
              default
            end
          end
        end
        .reject(&:nil?)

    indexes.sort.reverse.uniq.each { |index| arguments.delete_at(index) }

    values = [DEFAULTS.fetch(type)] if values.empty?
    values = values.map { |value| cast(type, value) }
    values = values.first unless values.many?
    options[key] = values
  end

  files = arguments.select { |argument| File.exist?(argument) }

  arguments -= files

  { arguments:, options:, files:, help: }.to_deep_struct
end