Class: Truck::Context::ConstResolver

Inherits:
Object
  • Object
show all
Defined in:
lib/truck/const_resolver.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(context:, expanded_const:) ⇒ ConstResolver

Returns a new instance of ConstResolver.



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# File 'lib/truck/const_resolver.rb', line 8

def initialize(context:, expanded_const:)
  @context        = context
  @expanded_const = expanded_const
end

Instance Attribute Details

#context ⇒ Object (readonly)

Returns the value of attribute context.



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# File 'lib/truck/const_resolver.rb', line 6

def context
  @context
end

#current_path ⇒ Object (readonly)

Returns the value of attribute current_path.



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# File 'lib/truck/const_resolver.rb', line 6

def current_path
  @current_path
end

#expanded_const ⇒ Object (readonly)

Returns the value of attribute expanded_const.



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# File 'lib/truck/const_resolver.rb', line 6

def expanded_const
  @expanded_const
end

Instance Method Details

#check_already_loaded ⇒ Object 



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# File 'lib/truck/const_resolver.rb', line 62

def check_already_loaded
  walk_const_parts.reduce context.mod do |mod, const_part|
    return nil unless mod.const_defined? const_part
    mod.const_get const_part
  end
end

#check_loaded(rb_file) ⇒ Object 



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# File 'lib/truck/const_resolver.rb', line 69

def check_loaded(rb_file)
  expected_const = expected_const_defined_in_rb_file rb_file
  walk_const_parts(expected_const).reduce context.mod do |mod, const_part|
    mod.const_defined?(const_part) or
      raise AutoloadError.new(const: expected_const, rb_file: rb_file)
    mod.const_get const_part
  end
end

#const_get ⇒ Object 



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# File 'lib/truck/const_resolver.rb', line 50

def const_get
  walk_const_parts.reduce context.mod do |mod, const_part|
    return nil unless mod.const_defined?(const_part)
    mod.const_get const_part
  end
end

#each_autoload_path ⇒ Object 



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# File 'lib/truck/const_resolver.rb', line 34

def each_autoload_path
  context.autoload_paths.each do |autoload_path|
    @current_path = autoload_path
    yield
  end
  @current_path = nil
end

#each_possible_rb_file ⇒ Object 



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# File 'lib/truck/const_resolver.rb', line 25

def each_possible_rb_file
  each_autoload_path do
    base_path = current_path.join expanded_const.to_snake_case
    each_rb_file_from_base_path base_path do |rb_file|
      yield rb_file if File.exist?(rb_file)
    end
  end
end

#each_rb_file_from_base_path(base_path) ⇒ Object 



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# File 'lib/truck/const_resolver.rb', line 42

def each_rb_file_from_base_path(base_path)
  base_path.ascend do |path|
    return if path == context.root
    rb_file = path.sub_ext '.rb'
    yield rb_file if rb_file.file?
  end
end

#expected_const_defined_in_rb_file(rb_file, autoload_path: current_path) ⇒ Object 



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# File 'lib/truck/const_resolver.rb', line 78

def expected_const_defined_in_rb_file(rb_file, autoload_path: current_path)
  rel_path = rb_file.sub_ext('').relative_path_from(autoload_path).to_s
  matcher = %r{\A(#{rel_path.to_camel_case})}i
  expanded_const.match(matcher).captures.fetch 0
end

#resolve ⇒ Object 



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# File 'lib/truck/const_resolver.rb', line 13

def resolve
  check_already_loaded or resolve!
end

#resolve! ⇒ Object 



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# File 'lib/truck/const_resolver.rb', line 17

def resolve!
  each_possible_rb_file do |rb_file|
    context.load_file rb_file
    check_loaded rb_file
  end
  const_get
end

#walk_const_parts(const = expanded_const) ⇒ Object 



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# File 'lib/truck/const_resolver.rb', line 57

def walk_const_parts(const = expanded_const)
  return to_enum(:walk_const_parts, const) if block_given?
  const.split '::'
end