Class: Code::Object::Function

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

Direct Known Subclasses

Super

Constant Summary collapse

CLASS_DOCUMENTATION = 
{
  name: "Function",
  description:
    "stores a callable block with parameters, captured context, and documentation.",
  examples: [
    "Function.new",
    "((value) => { value + 1 }).call(1)",
    "((value) => { value }).parameters.length"
  ]
}.freeze
INSTANCE_FUNCTIONS = 
{
  "call" => {
    name: "call",
    description:
      "evaluates the function body with the provided arguments.",
    examples: [
      "((value) => { value + 1 }).call(1)",
      "((name:) => { name }).call(name: :ada)",
      "((a, b = 2) => { a + b }).call(3)"
    ]
  },
  "new" => {
    name: "new",
    description:
      "evaluates the function body as a constructor with the provided arguments.",
    examples: [
      "Widget = () => { self.name = :widget return(self) } Widget.new.name",
      "User = (name:) => { self.name = name return(self) } User.new(name: :ada).name",
      "Counter = () => { self.count = 0 return(self) } Counter.new.count"
    ]
  },
  "extend" => {
    name: "extend",
    description:
      "creates a child function that can call the receiver through super.",
    examples: [
      "Base = () => { self.name = :base } Child = Base.extend(() => { super() }) Child().name",
      "Base = () => { 1 } Child = Base.extend(() => { super() }) Child()",
      "Base = (name) => { self.name = name } Child = Base.extend((...) => { super(...) }) Child(:a).name"
    ]
  },
  "documentation" => {
    name: "documentation",
    description:
      "returns or replaces the function documentation dictionary.",
    examples: [
      "f = () => { 1 } f.documentation",
      "f = () => { 1 } f.documentation(description: \"returns one\", examples: [\"f()\"])",
      "f = () => { 1 } f.documentation(description: \"returns one\", examples: [\"f()\"]).description"
    ]
  },
  "documentation=" => {
    name: "documentation=",
    description: "replaces the function documentation dictionary.",
    examples: [
      "f = () => { 1 } f.documentation = { description: \"returns one\", examples: [\"f()\"] }",
      "f = () => { 1 } f.documentation = { name: \"one\", description: \"returns one\", examples: [\"one()\"] } f.documentation.name",
      "f = () => { 1 } f.documentation = { description: \"returns one\", examples: [\"f()\"] } f.documentation.examples.first"
    ]
  },
  "parameters" => {
    name: "parameters",
    description:
      "returns a list of parameter descriptors for the function.",
    examples: [
      "((name) => { name }).parameters.first.name",
      "((name = :a) => { name }).parameters.first.default",
      "((...values) => { values }).parameters.first.spread?"
    ]
  },
  "to_string" => {
    name: "to_string",
    description: "formats the function as source code.",
    examples: [
      "(() => { 1 }).to_string",
      "((value) => { value + 1 }).to_string",
      "((name:) => { name }).to_string"
    ]
  }
}.freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args, parent: nil, functions: nil, **_kargs, &_block) ⇒ Function

Returns a new instance of Function.



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# File 'lib/code/object/function.rb', line 101

def initialize(*args, parent: nil, functions: nil, **_kargs, &_block)
  @code_parameters =
    List
      .new(args.first)
      .raw
      .map { |parameter| Parameter.new(parameter) }
      .to_code

  @code_body = Code.new(args.second.presence)
  @definition_context = args.third if args.third.is_a?(Context)
  @definition_object = args.fourth if args.fourth.is_a?(Object)
  @parent = parent.to_code
  self.functions = functions.to_code
  self.functions = Dictionary.new if self.functions.nothing?
  @instance_functions = Dictionary.new
  self.documentation =
    Dictionary.new(
      "name" => String.new(""),
      "description" => String.new(""),
      "examples" => List.new
    )

  self.raw = List.new([code_parameters, code_body])
end

Instance Attribute Details

#code_body ⇒ Object (readonly)

Returns the value of attribute code_body.



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# File 'lib/code/object/function.rb', line 94

def code_body
  @code_body
end

#code_parameters ⇒ Object (readonly)

Returns the value of attribute code_parameters.



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# File 'lib/code/object/function.rb', line 94

def code_parameters
  @code_parameters
end

#definition_context ⇒ Object (readonly)

Returns the value of attribute definition_context.



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# File 'lib/code/object/function.rb', line 94

def definition_context
  @definition_context
end

#definition_object ⇒ Object (readonly)

Returns the value of attribute definition_object.



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# File 'lib/code/object/function.rb', line 94

def definition_object
  @definition_object
end

#documentation ⇒ Object

Returns the value of attribute documentation.



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# File 'lib/code/object/function.rb', line 93

def documentation
  @documentation
end

#instance_functions ⇒ Object (readonly)

Returns the value of attribute instance_functions.



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# File 'lib/code/object/function.rb', line 94

def instance_functions
  @instance_functions
end

#parent ⇒ Object (readonly)

Returns the value of attribute parent.



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# File 'lib/code/object/function.rb', line 94

def parent
  @parent
end

Class Method Details

.function_documentation(scope) ⇒ Object 



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# File 'lib/code/object/function.rb', line 87

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/function.rb', line 126

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
  globals = multi_fetch(args, *GLOBALS)
  operator_name = code_operator.to_s
  operator_name = "" if operator_name == "new" &&
    code_has_key?(code_operator).falsy?

  case operator_name
  when "", "call"
    sig(args) { signature_for_call }
    code_call(
      *code_arguments.raw,
      explicit_arguments: args.fetch(:explicit_arguments, true),
      bound_self: args.fetch(:bound_self, nil),
      constructing_literal_classes:
        args.fetch(:constructing_literal_classes, nil),
      **globals
    )
  when "extend"
    sig(args) { Function }
    code_extend(code_arguments.code_first)
  when "documentation"
    if code_arguments.any?
      sig(args) { Dictionary }
      self.documentation = code_value.code_to_dictionary
    else
      sig(args)
      documentation
    end
  when "documentation="
    sig(args) { Dictionary }
    self.documentation = code_value.code_to_dictionary
  when "parameters"
    sig(args)
    code_parameters
  when /=$/
    sig(args) { Object }
    code_set(code_operator.to_s.chop, code_value)
  when ->(operator) { code_has_key?(operator).truthy? }
    result = code_fetch(code_operator)

    if result.is_a?(Function)
      result.call(**args, operator: nil, bound_self: self)
    else
      sig(args)
      result
    end
  else
    super
  end
end

#code_call(*arguments, explicit_arguments: true, bound_self: nil, constructing_literal_classes: nil, **globals) ⇒ Object 



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# File 'lib/code/object/function.rb', line 180

def code_call(
  *arguments,
  explicit_arguments: true,
  bound_self: nil,
  constructing_literal_classes: nil,
  **globals
)
  code_arguments = arguments.to_code
  code_context = Context.new({}, definition_context || globals[:context])
  evaluation_object = definition_object || globals.fetch(:previous_object)
  code_self = bound_self.to_code
  if (code_self.nil? || code_self.nothing?) && parent.is_a?(Class)
    code_self = parent.code_call(*arguments, **globals)
  end
  code_self = Dictionary.new if code_self.nil? || code_self.nothing?
  code_parent = captured_self.to_code

  code_context.code_set("self", code_self)
  bind_parent(code_context, code_self, code_parent)

  if parent.is_a?(Function) || parent.is_a?(Class)
    code_context.code_set(
      "super",
      Super.new(
        parent,
        code_arguments,
        code_self,
        definition_context || globals[:context],
        explicit_arguments: explicit_arguments
      )
    )
  end

  captures_function_arguments =
    code_parameters.raw.any? do |parameter|
      parameter.block? || parameter.blocks?
    end
  reserved_function_arguments =
    captures_function_arguments ? code_arguments.raw.grep(Function) : []
  code_block_argument =
    if code_parameters.raw.any?(&:block?)
      code_arguments.raw.detect { |argument| argument.is_a?(Function) }
    end

  code_parameters.raw.each.with_index do |code_parameter, index|
    code_argument =
      if code_parameter.spread?
        code_arguments
      elsif code_parameter.regular_splat?
        Object::List.new(
          code_arguments.raw.reject do |argument|
            argument.is_a?(Dictionary) ||
              reserved_function_arguments.include?(argument)
          end
        )
      elsif code_parameter.keyword_splat?
        code_arguments
          .raw
          .grep(Dictionary)
          .inject(Dictionary.new) do |memo, argument|
            memo.code_merge!(argument)
          end
      elsif code_parameter.block?
        code_block_argument.to_code
      elsif code_parameter.blocks?
        Object::List.new(
          code_arguments
            .raw
            .grep(Function)
            .reject { |argument| argument == code_block_argument }
        )
      elsif code_parameter.keyword?
        code_arguments
          .raw
          .grep(Dictionary)
          .detect do |code_dictionary|
            code_dictionary.code_has_key?(
              code_parameter.code_name
            ).truthy?
          end
          &.code_get(code_parameter.code_name)
          .to_code
      else
        code_arguments.raw[index].to_code
      end

    if code_argument.nothing?
      code_default = code_parameter.code_default
      code_argument =
        if code_default.is_a?(Code)
          code_default.code_evaluate(
            **globals,
            context: code_context,
            object: evaluation_object,
            previous_object: evaluation_object
          )
        else
          code_default
        end
    end

    code_name = code_parameter.code_name
    unless code_name.blank?
      code_context.code_set(code_name, code_argument)
    end
  end

  code_body
    .code_evaluate(
      **globals,
      constructing_literal_classes: constructing_literal_classes,
      context: code_context,
      object: evaluation_object,
      previous_object: evaluation_object
    )
    .tap { persist_instance_functions(code_self) }
rescue Error::Return => e
  persist_instance_functions(code_self)
  e.code_value
end

#code_class_functions ⇒ Object 



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# File 'lib/code/object/function.rb', line 428

def code_class_functions
  function_dictionary_for(functions)
end

#code_deep_duplicate ⇒ Object 



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# File 'lib/code/object/function.rb', line 370

def code_deep_duplicate
  duplicate = Function.new

  duplicate.code_replace(
    code_parameters: code_parameters.code_deep_duplicate,
    code_body: code_body.code_deep_duplicate,
    definition_context: definition_context&.code_deep_duplicate,
    definition_object: definition_object,
    parent:
      parent.is_a?(Function) ? parent.code_deep_duplicate : parent,
    functions: functions.code_deep_duplicate,
    instance_functions: instance_functions.code_deep_duplicate,
    documentation: documentation.code_deep_duplicate
  )
  duplicate
end

#code_extend(function) ⇒ Object 



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# File 'lib/code/object/function.rb', line 353

def code_extend(function)
  code_function = function.to_code

  Function
    .new(
      code_function.code_parameters,
      code_function.code_body.raw,
      code_function.definition_context,
      code_function.definition_object,
      parent: self,
      functions: functions.code_deep_duplicate
    )
    .tap do |extended_function|
      extended_function.instance_functions.code_merge!(instance_functions)
    end
end

#code_fetch(key) ⇒ Object 



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# File 'lib/code/object/function.rb', line 432

def code_fetch(key)
  functions.code_fetch(key)
end

#code_functions ⇒ Object 



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# File 'lib/code/object/function.rb', line 409

def code_functions
  code_class_functions
end

#code_get(key) ⇒ Object 



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# File 'lib/code/object/function.rb', line 436

def code_get(key)
  functions.code_get(key)
end

#code_has_key?(key) ⇒ Boolean

Returns:



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# File 'lib/code/object/function.rb', line 440

def code_has_key?(key)
  functions.code_has_key?(key)
end

#code_instance_functions ⇒ Object 



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# File 'lib/code/object/function.rb', line 413

def code_instance_functions
  parent_functions =
    if parent.is_a?(Function)
      parent.code_instance_functions
    else
      Dictionary.new
    end

  Object.sorted_dictionary(
    parent_functions.code_merge(
      function_dictionary_for(instance_functions)
    ).raw
  )
end

#code_replace(code_parameters:, code_body:, definition_context:, parent:, functions:, instance_functions:, documentation:, definition_object: nil) ⇒ Object 



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# File 'lib/code/object/function.rb', line 387

def code_replace(
  code_parameters:,
  code_body:,
  definition_context:,
  parent:,
  functions:,
  instance_functions:,
  documentation:,
  definition_object: nil
)
  @code_parameters = code_parameters
  @code_body = code_body
  @definition_context = definition_context
  @definition_object = definition_object
  @parent = parent
  self.functions = functions
  @instance_functions = instance_functions
  self.documentation = documentation
  self.raw = List.new([code_parameters, code_body])
  self
end

#code_set(key, value) ⇒ Object 



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# File 'lib/code/object/function.rb', line 444

def code_set(key, value)
  functions.code_set(key, value)
end

#code_to_string ⇒ Object 



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# File 'lib/code/object/function.rb', line 335

def code_to_string
  String.new(
    Format.format(
      [
        {
          function: {
            parameters:
              code_parameters.raw.map do |parameter|
                parameter_to_raw(parameter)
              end,
            body: code_body.raw.to_raw
          }
        }
      ]
    )
  )
end

#signature_for_call ⇒ Object 



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# File 'lib/code/object/function.rb', line 301

def signature_for_call
  code_parameters
    .raw
    .inject([]) do |signature, code_parameter|
      if code_parameter.spread? || code_parameter.regular_splat?
        signature + [Object.repeat]
      elsif code_parameter.blocks?
        signature + [Function.repeat]
      elsif code_parameter.block?
        signature + [Function.maybe]
      elsif code_parameter.keyword_splat?
        signature + [Dictionary.maybe]
      elsif code_parameter.keyword? && code_parameter.required?
        if signature.last.is_a?(::Hash)
          signature.last[code_parameter.code_name] = Object
          signature
        else
          signature + [{ code_parameter.code_name => Object }]
        end
      elsif code_parameter.keyword?
        if signature.last.is_a?(::Hash)
          signature.last[code_parameter.code_name] = Object.maybe
          signature
        else
          signature + [{ code_parameter.code_name => Object.maybe }]
        end
      elsif code_parameter.required?
        signature + [Object]
      else
        signature + [Object.maybe]
      end
    end + [Object.repeat]
end