Module: Kapusta::Compiler::Runtime

Defined in:
lib/kapusta/compiler/runtime.rb

Constant Summary collapse

HELPER_DEPENDENCIES = 
{
  print_values: %i[stringify],
  concat: %i[stringify],
  method_path_value: %i[kebab_to_snake],
  set_method_path: %i[kebab_to_snake],
  get_ivar: %i[kebab_to_snake],
  set_ivar: %i[kebab_to_snake],
  get_cvar: %i[current_class_scope kebab_to_snake],
  set_cvar: %i[current_class_scope kebab_to_snake],
  get_gvar: %i[kebab_to_snake],
  set_gvar: %i[kebab_to_snake],
  destructure: %i[destructure_into],
  match_pattern: %i[match_pattern_into]
}.freeze
HELPER_SOURCES = 
{
  kebab_to_snake: <<~RUBY.chomp,
  call: <<~'RUBY'.chomp,
  send_call: <<~RUBY.chomp,
  invoke_self: <<~RUBY.chomp,
  stringify: <<~RUBY.chomp,
  print_values: <<~'RUBY'.chomp,
  concat: <<~RUBY.chomp,
  get_path: <<~RUBY.chomp,
  qget_path: <<~RUBY.chomp,
  set_path: <<~RUBY.chomp,
  method_path_value: <<~RUBY.chomp,
  set_method_path: <<~'RUBY'.chomp,
  current_class_scope: <<~RUBY.chomp,
  get_ivar: <<~'RUBY'.chomp,
  set_ivar: <<~'RUBY'.chomp,
  get_cvar: <<~'RUBY'.chomp,
  set_cvar: <<~'RUBY'.chomp,
  get_gvar: <<~'RUBY'.chomp,
  set_gvar: <<~'RUBY'.chomp,
  ensure_module: <<~RUBY.chomp,
  ensure_class: <<~RUBY.chomp,
  destructure: <<~RUBY.chomp,
  destructure_into: <<~'RUBY'.chomp,
  match_pattern: <<~RUBY.chomp,
  match_pattern_into: <<~'RUBY'.chomp
    def __kap_match_pattern_into(pattern, value, bindings)
      case pattern[0]
      when :sym
        name = pattern[1]
        bindings[name] = value unless name == '_'
        true
      when :vec
        return false unless value.is_a?(Array) || value.respond_to?(:to_ary)

        array = value.is_a?(Array) ? value : value.to_ary
        items = pattern[1]
        rest_idx = items.index { |item| item.is_a?(Array) && item[0] == :rest }
        if rest_idx
          before = items[0...rest_idx]
          rest_pattern = items[rest_idx][1]
          return false if array.length < before.length

          before.each_with_index do |item, i|
            return false unless __kap_match_pattern_into(item, array[i], bindings)
          end
          __kap_match_pattern_into(rest_pattern, array[rest_idx..], bindings)
        else
          return false unless array.length == items.length

          items.each_with_index do |item, i|
            return false unless __kap_match_pattern_into(item, array[i], bindings)
          end
          true
        end
      when :hash
        return false unless value.is_a?(Hash)

        pattern[1].each do |key, subpattern|
          return false unless value.key?(key)
          return false unless __kap_match_pattern_into(subpattern, value[key], bindings)
        end
        true
      when :lit
        value == pattern[1]
      when :nil
        value.nil?
      else
        raise "bad pattern: #{pattern.inspect}"
      end
    end
  RUBY
}.transform_values(&:freeze).freeze

Class Method Summary collapse

Class Method Details

.append_helper_source(name, ordered, seen) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 320

def append_helper_source(name, ordered, seen)
  return if seen[name]

  HELPER_DEPENDENCIES.fetch(name, []).each do |dependency|
    append_helper_source(dependency, ordered, seen)
  end
  ordered << name
  seen[name] = true
end

.call(callee, positional, kwargs = nil, block = nil) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 330

def call(callee, positional, kwargs = nil, block = nil)
  raise "not callable: #{callee.inspect}" unless callee.respond_to?(:call)

  if block
    kwargs ? callee.call(*positional, **kwargs, &block) : callee.call(*positional, &block)
  else
    kwargs ? callee.call(*positional, **kwargs) : callee.call(*positional)
  end
end

.concat(values) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 383

def concat(values)
  values.map { |value| stringify(value) }.join
end

.current_class_scope(receiver) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 419

def current_class_scope(receiver)
  receiver.is_a?(Module) ? receiver : receiver.class
end

.destructure(pattern, value) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 493

def destructure(pattern, value)
  bindings = {}
  destructure_into(pattern, value, bindings)
  bindings
end

.destructure_into(pattern, value, bindings) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 499

def destructure_into(pattern, value, bindings)
  case pattern[0]
  when :sym
    name = pattern[1]
    bindings[name] = value unless name == '_'
  when :vec
    items = pattern[1]
    rest_idx = items.index { |item| item.is_a?(Array) && item[0] == :rest }
    if rest_idx
      before = items[0...rest_idx]
      rest_pattern = items[rest_idx][1]
      before.each_with_index do |item, i|
        destructure_into(item, value ? value[i] : nil, bindings)
      end
      rest_value = value ? (value[rest_idx..] || []) : []
      destructure_into(rest_pattern, rest_value, bindings)
    else
      items.each_with_index do |item, i|
        destructure_into(item, value ? value[i] : nil, bindings)
      end
    end
  when :hash
    pattern[1].each do |key, subpattern|
      destructure_into(subpattern, value ? value[key] : nil, bindings)
    end
  when :ignore
    nil
  else
    raise "unknown destructure pattern: #{pattern.inspect}"
  end
end

.ensure_class(holder, path, super_class) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 470

def ensure_class(holder, path, super_class)
  segments = path.split('.')
  last = segments.pop
  scope = holder.is_a?(Module) ? holder : Object
  segments.each do |segment|
    scope =
      if scope.const_defined?(segment, false)
        scope.const_get(segment, false)
      else
        mod = Module.new
        scope.const_set(segment, mod)
        mod
      end
  end
  if scope.const_defined?(last, false)
    scope.const_get(last, false)
  else
    klass = Class.new(super_class)
    scope.const_set(last, klass)
    klass
  end
end

.ensure_module(holder, path) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 447

def ensure_module(holder, path)
  segments = path.split('.')
  last = segments.pop
  scope = holder.is_a?(Module) ? holder : Object
  segments.each do |segment|
    scope =
      if scope.const_defined?(segment, false)
        scope.const_get(segment, false)
      else
        mod = Module.new
        scope.const_set(segment, mod)
        mod
      end
  end
  if scope.const_defined?(last, false)
    scope.const_get(last, false)
  else
    mod = Module.new
    scope.const_set(last, mod)
    mod
  end
end

.get_cvar(receiver, name) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 431

def get_cvar(receiver, name)
  current_class_scope(receiver).class_variable_get("@@#{Kapusta.kebab_to_snake(name)}")
end

.get_gvar(name) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 439

def get_gvar(name)
  Kernel.eval("$#{Kapusta.kebab_to_snake(name)}", binding, __FILE__, __LINE__) # $stderr
end

.get_ivar(receiver, name) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 423

def get_ivar(receiver, name)
  receiver.instance_variable_get("@#{Kapusta.kebab_to_snake(name)}")
end

.get_path(obj, keys) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 387

def get_path(obj, keys)
  keys.reduce(obj) { |acc, key| acc[key] }
end

.helper_name(name) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 304

def helper_name(name)
  "__kap_#{name}"
end

.helper_source(helpers) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 308

def helper_source(helpers)
  ordered = []
  seen = {}
  helpers.each { |name| append_helper_source(name.to_sym, ordered, seen) }
  return '' if ordered.empty?

  [
    ordered.map { |name| HELPER_SOURCES.fetch(name) }.join("\n\n"),
    "private #{ordered.map { |name| ":#{helper_name(name)}" }.join(', ')}"
  ].join("\n\n")
end

.invoke_self(receiver, method_name, positional, kwargs = nil, block = nil) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 356

def invoke_self(receiver, method_name, positional, kwargs = nil, block = nil)
  if block
    if kwargs
      receiver.send(method_name, *positional, **kwargs,
                    &block)
    else
      receiver.send(method_name, *positional, &block)
    end
  else
    kwargs ? receiver.send(method_name, *positional, **kwargs) : receiver.send(method_name, *positional)
  end
end

.match_pattern(pattern, value) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 531

def match_pattern(pattern, value)
  bindings = {}
  [match_pattern_into(pattern, value, bindings), bindings]
end

.match_pattern_into(pattern, value, bindings) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 536

def match_pattern_into(pattern, value, bindings)
  case pattern[0]
  when :sym
    name = pattern[1]
    bindings[name] = value unless name == '_'
    true
  when :vec
    return false unless value.is_a?(Array) || value.respond_to?(:to_ary)

    array = value.is_a?(Array) ? value : value.to_ary
    items = pattern[1]
    rest_idx = items.index { |item| item.is_a?(Array) && item[0] == :rest }
    if rest_idx
      before = items[0...rest_idx]
      rest_pattern = items[rest_idx][1]
      return false if array.length < before.length

      before.each_with_index do |item, i|
        return false unless match_pattern_into(item, array[i], bindings)
      end
      match_pattern_into(rest_pattern, array[rest_idx..], bindings)
    else
      return false unless array.length == items.length

      items.each_with_index do |item, i|
        return false unless match_pattern_into(item, array[i], bindings)
      end
      true
    end
  when :hash
    return false unless value.is_a?(Hash)

    pattern[1].each do |key, subpattern|
      return false unless value.key?(key)
      return false unless match_pattern_into(subpattern, value[key], bindings)
    end
    true
  when :lit
    value == pattern[1]
  when :nil
    value.nil?
  else
    raise "bad pattern: #{pattern.inspect}"
  end
end

.method_path_value(base, segments) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 406

def method_path_value(base, segments)
  segments.reduce(base) { |obj, segment| obj.public_send(Kapusta.kebab_to_snake(segment).to_sym) }
end

.print_values(*values) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 378

def print_values(*values)
  $stdout.puts(values.map { |value| stringify(value) }.join("\t"))
  nil
end

.qget_path(obj, keys) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 391

def qget_path(obj, keys)
  keys.each do |key|
    return nil if obj.nil?

    obj = obj[key]
  end
  obj
end

.send_call(receiver, method_name, positional, kwargs = nil, block = nil) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 340

def send_call(receiver, method_name, positional, kwargs = nil, block = nil)
  if block
    if kwargs
      receiver.public_send(method_name, *positional, **kwargs,
                           &block)
    else
      receiver.public_send(method_name, *positional, &block)
    end
  elsif kwargs
    receiver.public_send(method_name, *positional,
                         **kwargs)
  else
    receiver.public_send(method_name, *positional)
  end
end

.set_cvar(receiver, name, value) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 435

def set_cvar(receiver, name, value)
  current_class_scope(receiver).class_variable_set("@@#{Kapusta.kebab_to_snake(name)}", value)
end

.set_gvar(name, value) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 443

def set_gvar(name, value)
  Kernel.eval("$#{Kapusta.kebab_to_snake(name)} = value", binding, __FILE__, __LINE__) # $stderr = value
end

.set_ivar(receiver, name, value) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 427

def set_ivar(receiver, name, value)
  receiver.instance_variable_set("@#{Kapusta.kebab_to_snake(name)}", value)
end

.set_method_path(base, segments, value) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 410

def set_method_path(base, segments, value)
  target = base
  segments[0...-1].each do |segment|
    target = target.public_send(Kapusta.kebab_to_snake(segment).to_sym)
  end
  setter = "#{Kapusta.kebab_to_snake(segments.last)}="
  target.public_send(setter.to_sym, value)
end

.set_path(obj, keys, value) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 400

def set_path(obj, keys, value)
  target = obj
  keys[0...-1].each { |key| target = target[key] }
  target[keys.last] = value
end

.stringify(value) ⇒ Object 



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# File 'lib/kapusta/compiler/runtime.rb', line 369

def stringify(value)
  case value
  when nil then 'nil'
  when true then 'true'
  when false then 'false'
  else value.to_s
  end
end