Class: Bridgetown::Drops::Drop

Inherits:
Liquid::Drop
  • Object
show all
Includes:
Enumerable
Defined in:
lib/bridgetown-core/drops/drop.rb

Constant Summary collapse

NON_CONTENT_METHODS =
[:fallback_data, :collapse_document].freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(obj) ⇒ Drop

Create a new Drop

obj - the Bridgetown Site, Collection, or Document required by the drop.

Returns nothing



31
32
33
# File 'lib/bridgetown-core/drops/drop.rb', line 31

def initialize(obj) # rubocop:disable Lint/MissingSuper
  @obj = obj
end

Class Method Details

.mutable(is_mutable = nil) ⇒ Object

Get or set whether the drop class is mutable. Mutability determines whether or not pre-defined fields may be overwritten.

is_mutable - Boolean set mutability of the class (default: nil)

Returns the mutability of the class



17
18
19
# File 'lib/bridgetown-core/drops/drop.rb', line 17

def self.mutable(is_mutable = nil)
  @is_mutable = is_mutable || false
end

.mutable?Boolean

Returns:

  • (Boolean)


21
22
23
# File 'lib/bridgetown-core/drops/drop.rb', line 21

def self.mutable?
  @is_mutable
end

Instance Method Details

#[](key) ⇒ Object Also known as: invoke_drop

Access a method in the Drop or a field in the underlying hash data. If mutable, checks the mutations first. Then checks the methods, and finally check the underlying hash (e.g. document front matter) if all the previous places didn't match.

key - the string key whose value to fetch

Returns the value for the given key, or nil if none exists



43
44
45
46
47
48
49
50
51
# File 'lib/bridgetown-core/drops/drop.rb', line 43

def [](key)
  if self.class.mutable? && mutations.key?(key)
    mutations[key]
  elsif self.class.invokable? key
    public_send key
  else
    fallback_data[key]
  end
end

#[]=(key, val) ⇒ Object

Set a field in the Drop. If mutable, sets in the mutations and returns. If not mutable, checks first if it's trying to override a Drop method and raises a DropMutationException if so. If not mutable and the key is not a method on the Drop, then it sets the key to the value in the underlying hash (e.g. document front matter)

key - the String key whose value to set val - the Object to set the key's value to

Returns the value the key was set to unless the Drop is not mutable and the key matches a method in which case it raises a DropMutationException.



67
68
69
70
71
72
73
74
75
76
77
78
79
80
# File 'lib/bridgetown-core/drops/drop.rb', line 67

def []=(key, val)
  setter = "#{key}="
  if respond_to?(setter)
    public_send(setter, val)
  elsif respond_to?(key.to_s)
    unless self.class.mutable?
      raise Errors::DropMutationException, "Key #{key} cannot be set in the drop."
    end

    mutations[key] = val
  else
    fallback_data[key] = val
  end
end

#content_methodsObject

Generates a list of strings which correspond to content getter methods.

Returns an Array of strings which represent method-specific keys.



86
87
88
89
90
91
92
93
94
# File 'lib/bridgetown-core/drops/drop.rb', line 86

def content_methods
  @content_methods ||= (
    self.class.instance_methods \
      - Bridgetown::Drops::Drop.instance_methods \
      - NON_CONTENT_METHODS
  ).map(&:to_s).reject do |method|
    method.end_with?("=")
  end
end

#eachObject



166
167
168
169
170
# File 'lib/bridgetown-core/drops/drop.rb', line 166

def each
  each_key.each do |key|
    yield key, self[key]
  end
end

#each_key(&block) ⇒ Object

Collects all the keys and passes each to the block in turn.

block - a block which accepts one argument, the key

Returns nothing.



162
163
164
# File 'lib/bridgetown-core/drops/drop.rb', line 162

def each_key(&block)
  keys.each(&block)
end

#fetch(key, default = nil, &block) ⇒ Object

Imitate Hash.fetch method in Drop

Returns value if key is present in Drop, otherwise returns default value KeyError is raised if key is not present and no default value given

Raises:

  • (KeyError)


201
202
203
204
205
206
207
# File 'lib/bridgetown-core/drops/drop.rb', line 201

def fetch(key, default = nil, &block)
  return self[key] if key?(key)
  raise KeyError, %(key not found: "#{key}") if default.nil? && block.nil?
  return yield(key) unless block.nil?

  default unless default.nil?
end

#hash_for_jsonObject

Generate a Hash for use in generating JSON. This is useful if fields need to be cleared before the JSON can generate.

Returns a Hash ready for JSON generation.



144
145
146
# File 'lib/bridgetown-core/drops/drop.rb', line 144

def hash_for_json(*)
  to_h
end

#inspectObject

Inspect the drop's keys and values through a JSON representation of its keys and values.

Returns a pretty generation of the hash representation of the Drop.



136
137
138
# File 'lib/bridgetown-core/drops/drop.rb', line 136

def inspect
  JSON.pretty_generate to_h
end

#key?(key) ⇒ Boolean

Check if key exists in Drop

key - the string key whose value to fetch

Returns true if the given key is present

Returns:

  • (Boolean)


101
102
103
104
105
106
# File 'lib/bridgetown-core/drops/drop.rb', line 101

def key?(key)
  return false if key.nil?
  return true if self.class.mutable? && mutations.key?(key)

  respond_to?(key) || fallback_data.key?(key)
end

#keysArray<String>

Generates a list of keys with user content as their values. This gathers up the Drop methods and keys of the mutations and underlying data hashes and performs a set union to ensure a list of unique keys for the Drop.

Returns:

  • (Array<String>)


114
115
116
117
118
# File 'lib/bridgetown-core/drops/drop.rb', line 114

def keys
  (content_methods |
    mutations.keys |
    fallback_data.keys).flatten
end

#merge(other, &block) ⇒ Object



172
173
174
175
176
177
178
179
180
# File 'lib/bridgetown-core/drops/drop.rb', line 172

def merge(other, &block)
  dup.tap do |me|
    if block.nil?
      me.merge!(other)
    else
      me.merge!(other, block)
    end
  end
end

#merge!(other) ⇒ Object



182
183
184
185
186
187
188
189
190
191
192
193
194
195
# File 'lib/bridgetown-core/drops/drop.rb', line 182

def merge!(other)
  other.each_key do |key|
    if block_given?
      self[key] = yield key, self[key], other[key]
    else
      if Utils.mergeable?(self[key]) && Utils.mergeable?(other[key])
        self[key] = Utils.deep_merge_hashes(self[key], other[key])
        next
      end

      self[key] = other[key] unless other[key].nil?
    end
  end
end

#to_hObject Also known as: to_hash

Generate a Hash representation of the Drop by resolving each key's value. It includes Drop methods, mutations, and the underlying object's data. See the documentation for Drop#keys for more.

Returns a Hash with all the keys and values resolved.



125
126
127
128
129
# File 'lib/bridgetown-core/drops/drop.rb', line 125

def to_h
  keys.each_with_object({}) do |(key, _), result|
    result[key] = self[key]
  end
end

#to_json(state = nil) ⇒ Object

Generate a JSON representation of the Drop.

state - the JSON::State object which determines the state of current processing.

Returns a JSON representation of the Drop in a String.



153
154
155
# File 'lib/bridgetown-core/drops/drop.rb', line 153

def to_json(state = nil)
  JSON.generate(hash_for_json(state), state)
end