Class: Foobara::DataPath

Inherits:
Object
  • Object
show all
Defined in:
foobara-0.0.125/projects/common/src/data_path.rb

Overview

TODO: figure out how to share code between here and ErrorKey TODO: use this to implement computed attributes

Defined Under Namespace

Classes: BadPathError, TooManyValuesAtPathError

Constant Summary collapse

EMPTY_PATH =

TODO: use this wherever it makes sense

[].freeze
INDEX_VALUE = 
/\A\d+\z/

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(path = []) ⇒ DataPath

TODO: accept error_class instead of symbol/category??

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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 92

def initialize(path = [])
  path = path.to_s if path.is_a?(::Symbol)
  path = path.split(".") if path.is_a?(::String)

  self.path = path
end

Instance Attribute Details

#path ⇒ Object

Returns the value of attribute path.


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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 89

def path
  @path
end

Class Method Details

.append_path(key) ⇒ Object

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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 67

def append_path(key, *)
  if key.is_a?(DataPath)
    key.append(*)
  else
    key = new(key)
    key.append!(*).to_s
  end
end

.for(object) ⇒ Object

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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 80

def for(object)
  if object.is_a?(DataPath)
    object
  else
    new(object)
  end
end

.parse(key_string) ⇒ Object

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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 76

def parse(key_string)
  new(key_string)
end

.prepend_path(key) ⇒ Object

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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 58

def prepend_path(key, *)
  if key.is_a?(DataPath)
    key.prepend(*)
  else
    key = new(key)
    key.prepend!(*).to_s
  end
end

.set_value_at(object, value, data_path) ⇒ Object

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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 50

def set_value_at(object, value, data_path)
  unless data_path.is_a?(DataPath)
    data_path = new(data_path)
  end

  data_path.set_value_at(object, value)
end

.to_s_type(key) ⇒ Object

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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 26

def to_s_type(key)
  unless key.is_a?(DataPath)
    key = new(key)
  end

  key.to_s_type
end

.value_at(data_path, object) ⇒ Object

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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 42

def value_at(data_path, object)
  unless data_path.is_a?(DataPath)
    data_path = new(data_path)
  end

  data_path.value_at(object)
end

.values_at(data_path, object) ⇒ Object

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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 34

def values_at(data_path, object)
  unless data_path.is_a?(DataPath)
    data_path = new(data_path)
  end

  data_path.values_at(object)
end

Instance Method Details

#==(other) ⇒ Object

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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 211

def ==(other)
  self.class == other.class && path == other.path
end

#append ⇒ Object

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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 135

def append(*)
  dup.tap do |key|
    key.append!(*)
  end
end

#append!(*append_parts) ⇒ Object

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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 122

def append!(*append_parts)
  if append_parts.size == 1
    arg = append_parts.first

    if arg.is_a?(Array)
      append_parts = arg
    end
  end

  self.path = [*path, *append_parts]
  self
end

#empty? ⇒ Boolean

Returns:

  • (Boolean)
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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 219

def empty?
  path.empty?
end

#last ⇒ Object

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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 215

def last
  path.last
end

#prepend ⇒ Object

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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 116

def prepend(*)
  dup.tap do |key|
    key.prepend!(*)
  end
end

#prepend!(*prepend_parts) ⇒ Object

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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 103

def prepend!(*prepend_parts)
  if prepend_parts.size == 1
    arg = prepend_parts.first

    if arg.is_a?(Array)
      prepend_parts = arg
    end
  end

  self.path = [*prepend_parts, *path]
  self
end

#set_value_at(object, value, parts = path) ⇒ Object

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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 179

def set_value_at(object, value, parts = path)
  owner = value_at(object, parts[0..-2])
  index = parts.last

  if owner.is_a?(::Hash)
    if owner.key?(index.to_s)
      owner[index.to_s] = value
    else
      owner[index] = value
    end
  elsif owner.is_a?(::Array)
    owner[index] = value
  else
    method = "#{index}="
    if owner.respond_to?(method)
      owner.send(method, value)
    else
      # :nocov:
      raise BadPathError, "Bad path: #{parts}"
      # :nocov:
    end
  end

  value
end

#simple_collection? ⇒ Boolean

Helper method that determines if the path points to an array and none of the atoms along the way are also arrays. And that there’s at least one atom (we are going to consider a collection to be “named” not an anonymous array.)

Returns:

  • (Boolean)
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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 207

def simple_collection?
  path.size > 1 && path.last == :"#" && path[0..-2].none? { |part| part == :"#" }
end

#to_s ⇒ Object

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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 153

def to_s
  path.join(".")
end

#to_s_type ⇒ Object

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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 161

def to_s_type
  to_type.to_s
end

#to_sym ⇒ Object

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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 157

def to_sym(...)
  to_s(...).to_sym
end

#to_type ⇒ Object

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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 149

def to_type
  dup.tap(&:to_type!)
end

#to_type! ⇒ Object

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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 143

def to_type!
  path.map! do |part|
    part.is_a?(Integer) ? :"#" : part
  end
end

#value_at(object, parts = path) ⇒ Object

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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 169

def value_at(object, parts = path)
  values = values_at(object, parts)

  if values.size > 1
    raise TooManyValuesAtPathError.new(path, values)
  end

  values.first
end

#values_at(object, parts = path) ⇒ Object

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# File 'foobara-0.0.125/projects/common/src/data_path.rb', line 165

def values_at(object, parts = path)
  _values_at([object], parts)
end