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# frozen_string_literal: true
require 'forwardable'
module Grape
class Entity
class Options
extend Forwardable
attr_reader :opts_hash
def_delegators :opts_hash, :dig, :key?, :fetch, :[], :empty?
def initialize(opts_hash = {})
@opts_hash = opts_hash
@has_only = !opts_hash[:only].nil?
@has_except = !opts_hash[:except].nil?
@for_nesting_cache = {}
@should_return_key_cache = {}
end
def merge(new_opts)
return self if new_opts.empty?
merged = if new_opts.instance_of? Options
@opts_hash.merge(new_opts.opts_hash)
else
@opts_hash.merge(new_opts)
end
Options.new(merged)
end
def reverse_merge(new_opts)
return self if new_opts.empty?
merged = if new_opts.instance_of? Options
new_opts.opts_hash.merge(@opts_hash)
else
new_opts.merge(@opts_hash)
end
Options.new(merged)
end
def ==(other)
other_hash = other.is_a?(Options) ? other.opts_hash : other
@opts_hash == other_hash
end
def should_return_key?(key)
return true unless @has_only || @has_except
only = only_fields.nil? ||
only_fields.key?(key)
except = except_fields&.key?(key) &&
except_fields[key] == true
only && !except
end
def for_nesting(key)
@for_nesting_cache[key] ||= build_for_nesting(key)
end
def only_fields(for_key = nil)
return nil unless @has_only
@only_fields ||= @opts_hash[:only].each_with_object({}) do |attribute, allowed_fields|
build_symbolized_hash(attribute, allowed_fields)
end
only_for_given(for_key, @only_fields)
end
def except_fields(for_key = nil)
return nil unless @has_except
@except_fields ||= @opts_hash[:except].each_with_object({}) do |attribute, allowed_fields|
build_symbolized_hash(attribute, allowed_fields)
end
only_for_given(for_key, @except_fields)
end
def with_attr_path(part)
return yield unless part
stack = (opts_hash[:attr_path] ||= [])
stack.push part
result = yield
stack.pop
result
end
private
def build_for_nesting(key)
Options.new(
opts_hash.dup.reject { |current_key| current_key == :collection }.merge(
root: nil,
only: only_fields(key),
except: except_fields(key),
attr_path: opts_hash[:attr_path]
)
)
end
def build_symbolized_hash(attribute, hash)
case attribute
when Hash
attribute.each do |attr, nested_attrs|
hash[attr.to_sym] = build_symbolized_hash(nested_attrs, {})
end
when Array
return attribute.each { |x| build_symbolized_hash(x, {}) }
else
hash[attribute.to_sym] = true
end
hash
end
def only_for_given(key, fields)
if key && fields[key].is_a?(Array)
fields[key]
elsif key.nil?
fields
end
end
end
end
end
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