Class: Code::Object::Regex

Inherits:
Object show all
Defined in:
lib/code/object/regex.rb

Constant Summary collapse

CLASS_DOCUMENTATION = 
{
  name: "Regex",
  description:
    "represents a regular expression pattern with explicit matching options.",
  examples: [
    "Regex",
    "Regex.new(\"a|b|c\")",
    "Regex.new(\"^hello\", ignore_case: true)"
  ]
}.freeze
INSTANCE_FUNCTIONS = 
{
  "match?" => {
    name: "match?",
    description: "returns whether the regex matches a string.",
    examples: [
      "Regex.new(\"a|b|c\").match?(\"b\")",
      "Regex.new(\"^hello\").match?(\"hello world\")",
      "Regex.new(\"^hello\").match?(\"say hello\")"
    ]
  },
  "source" => {
    name: "source",
    description: "returns the regex pattern source.",
    examples: [
      "Regex.new(\"a|b|c\").source",
      "Regex.new(\"^hello\").source",
      "Regex.new(\"hello\", ignore_case: true).source"
    ]
  },
  "options" => {
    name: "options",
    description: "returns the enabled regex options.",
    examples: [
      "Regex.new(\"hello\").options",
      "Regex.new(\"hello\", ignore_case: true).options.ignore_case",
      "Regex.new(\"hello\", multiple_lines: true).options.multiple_lines"
    ]
  },
  "ignore_case?" => {
    name: "ignore_case?",
    description: "returns whether the regex ignores case.",
    examples: [
      "Regex.new(\"hello\").ignore_case?",
      "Regex.new(\"hello\", ignore_case: true).ignore_case?",
      "Regex.new(\"hello\", ignore_case: false).ignore_case?"
    ]
  },
  "extended?" => {
    name: "extended?",
    description: "returns whether the regex ignores whitespace and comments.",
    examples: [
      "Regex.new(\"hello\").extended?",
      "Regex.new(\"hello\", extended: true).extended?",
      "Regex.new(\"hello\", extended: false).extended?"
    ]
  },
  "multiple_lines?" => {
    name: "multiple_lines?",
    description: "returns whether the regex matches across multiple lines.",
    examples: [
      "Regex.new(\"hello\").multiple_lines?",
      "Regex.new(\"hello\", multiple_lines: true).multiple_lines?",
      "Regex.new(\"hello\", multiple_lines: false).multiple_lines?"
    ]
  },
  "fixed_encoding?" => {
    name: "fixed_encoding?",
    description: "returns whether the regex has fixed encoding.",
    examples: [
      "Regex.new(\"hello\").fixed_encoding?",
      "Regex.new(\"hello\", fixed_encoding: true).fixed_encoding?",
      "Regex.new(\"hello\", fixed_encoding: false).fixed_encoding?"
    ]
  },
  "no_encoding?" => {
    name: "no_encoding?",
    description: "returns whether the regex has no encoding.",
    examples: [
      "Regex.new(\"hello\").no_encoding?",
      "Regex.new(\"hello\", no_encoding: true).no_encoding?",
      "Regex.new(\"hello\", no_encoding: false).no_encoding?"
    ]
  }
}.freeze
OPTION_FLAGS = 
{
  "ignore_case" => ::Regexp::IGNORECASE,
  "extended" => ::Regexp::EXTENDED,
  "multiple_lines" => ::Regexp::MULTILINE,
  "fixed_encoding" => ::Regexp::FIXEDENCODING,
  "no_encoding" => ::Regexp::NOENCODING
}.freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args, **kargs, &_block) ⇒ Regex

Returns a new instance of Regex.



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# File 'lib/code/object/regex.rb', line 104

def initialize(*args, **kargs, &_block)
  raise Error, "Regex.new: pattern is required" if args.empty?
  raise Error, "Regex.new: expected 1-2 arguments" if args.size > 2

  pattern = args.first
  option_values = {}

  if args[1]
    case args[1]
    when Dictionary
      args[1].raw.each do |key, value|
        option_values[key.to_s] =
          value.is_an?(Object) ? value.truthy? : !!value
      end
    when ::Hash
      args[1].each do |key, value|
        option_values[key.to_s] =
          value.is_an?(Object) ? value.truthy? : !!value
      end
    else
      raise Error, "Regex.new: options must be a dictionary"
    end
  end

  kargs.each do |key, value|
    option_values[key.to_s] =
      value.is_an?(Object) ? value.truthy? : !!value
  end

  options =
    option_values.reduce(0) do |flags, (name, enabled)|
      flag = OPTION_FLAGS[name]
      raise Error, "unknown regex option: #{name}" unless flag

      enabled ? flags | flag : flags
    end

  self.raw =
    if pattern.is_a?(Regex)
      ::Regexp.new(pattern.raw.source, pattern.raw.options | options)
    elsif pattern.is_a?(::Regexp)
      ::Regexp.new(pattern.source, pattern.options | options)
    else
      ::Regexp.new(pattern.to_s, options)
    end
rescue ::RegexpError => e
  raise Error, "invalid regex: #{e.message}"
end

Class Method Details

.function_documentation(scope) ⇒ Object 



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# File 'lib/code/object/regex.rb', line 98

def self.function_documentation(scope)
  return INSTANCE_FUNCTIONS if scope == :instance

  {}
end

Instance Method Details

#call(**args) ⇒ Object 



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# File 'lib/code/object/regex.rb', line 153

def call(**args)
  code_operator = args.fetch(:operator, nil).to_code
  code_arguments = args.fetch(:arguments, List.new).to_code
  code_value = code_arguments.code_first

  case code_operator.to_s
  when "match?"
    sig(args) { String }
    code_match?(code_value)
  when "source"
    sig(args)
    code_source
  when "options"
    sig(args)
    code_options
  when "ignore_case?"
    sig(args)
    code_ignore_case?
  when "extended?"
    sig(args)
    code_extended?
  when "multiple_lines?"
    sig(args)
    code_multiple_lines?
  when "fixed_encoding?"
    sig(args)
    code_fixed_encoding?
  when "no_encoding?"
    sig(args)
    code_no_encoding?
  else
    super
  end
end

#code_extended? ⇒ Boolean

Returns:



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# File 'lib/code/object/regex.rb', line 206

def code_extended?
  Boolean.new((raw.options & ::Regexp::EXTENDED) == ::Regexp::EXTENDED)
end

#code_fixed_encoding? ⇒ Boolean

Returns:



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# File 'lib/code/object/regex.rb', line 214

def code_fixed_encoding?
  Boolean.new(
    (raw.options & ::Regexp::FIXEDENCODING) == ::Regexp::FIXEDENCODING
  )
end

#code_ignore_case? ⇒ Boolean

Returns:



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# File 'lib/code/object/regex.rb', line 202

def code_ignore_case?
  Boolean.new((raw.options & ::Regexp::IGNORECASE) == ::Regexp::IGNORECASE)
end

#code_inspect ⇒ Object 



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# File 'lib/code/object/regex.rb', line 228

def code_inspect
  String.new(raw.inspect)
end

#code_match?(string) ⇒ Boolean

Returns:



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# File 'lib/code/object/regex.rb', line 188

def code_match?(string)
  Boolean.new(raw.match?(string.to_s))
end

#code_multiple_lines? ⇒ Boolean

Returns:



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# File 'lib/code/object/regex.rb', line 210

def code_multiple_lines?
  Boolean.new((raw.options & ::Regexp::MULTILINE) == ::Regexp::MULTILINE)
end

#code_no_encoding? ⇒ Boolean

Returns:



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# File 'lib/code/object/regex.rb', line 220

def code_no_encoding?
  Boolean.new((raw.options & ::Regexp::NOENCODING) == ::Regexp::NOENCODING)
end

#code_options ⇒ Object 



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# File 'lib/code/object/regex.rb', line 196

def code_options
  Dictionary.new(
    OPTION_FLAGS.transform_values { |flag| (raw.options & flag) == flag }
  )
end

#code_source ⇒ Object 



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# File 'lib/code/object/regex.rb', line 192

def code_source
  String.new(raw.source)
end

#code_to_string ⇒ Object 



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# File 'lib/code/object/regex.rb', line 224

def code_to_string
  code_source
end