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# frozen_string_literal: true
require 'active_support/core_ext/hash/keys'
require 'active_support/core_ext/string'
require 'case_transform/version'
module CaseTransform
class << self
def camel_cache
@camel_cache ||= {}
end
def camel_lower_cache
@camel_lower_cache ||= {}
end
def dash_cache
@dash_cache ||= {}
end
def underscore_cache
@underscore_cache ||= {}
end
# Transforms values to UpperCamelCase or PascalCase.
#
# @example:
# "some_key" => "SomeKey",
def camel(value)
case value
when Array then value.map { |item| camel(item) }
when Hash then value.deep_transform_keys! { |key| camel(key) }
when Symbol then camel(value.to_s).to_sym
when String then camel_cache[value] ||= value.underscore.camelize
else value
end
end
# Transforms values to camelCase.
#
# @example:
# "some_key" => "someKey",
def camel_lower(value)
case value
when Array then value.map { |item| camel_lower(item) }
when Hash then value.deep_transform_keys! { |key| camel_lower(key) }
when Symbol then camel_lower(value.to_s).to_sym
when String then camel_lower_cache[value] ||= value.underscore.camelize(:lower)
else value
end
end
# Transforms values to dashed-case.
# This is the default case for the JsonApi adapter.
#
# @example:
# "some_key" => "some-key",
def dash(value)
case value
when Array then value.map { |item| dash(item) }
when Hash then value.deep_transform_keys! { |key| dash(key) }
when Symbol then dash(value.to_s).to_sym
when String then dash_cache[value] ||= value.underscore.dasherize
else value
end
end
# Transforms values to underscore_case.
# This is the default case for deserialization in the JsonApi adapter.
#
# @example:
# "some-key" => "some_key",
def underscore(value)
case value
when Array then value.map { |item| underscore(item) }
when Hash then value.deep_transform_keys! { |key| underscore(key) }
when Symbol then underscore(value.to_s).to_sym
when String then underscore_cache[value] ||= value.underscore
else value
end
end
# Returns the value unaltered
def unaltered(value)
value
end
end
end
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