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# frozen_string_literal: true
module Gitlab
module Changelog
module Template
# Context is used to provide a binding/context to ERB templates used for
# rendering changelogs.
#
# This class extends BasicObject so that we only expose the bare minimum
# needed to render the ERB template.
class Context < BasicObject
MAX_NESTED_LOOPS = 4
def initialize(variables)
@variables = variables
@loop_nesting = 0
end
def get_binding
::Kernel.binding
end
def each(value, &block)
max = MAX_NESTED_LOOPS
if @loop_nesting == max
::Kernel.raise(
::Template::TemplateError.new("You can only nest up to #{max} loops")
)
end
@loop_nesting += 1
result = value.each(&block) if value.respond_to?(:each)
@loop_nesting -= 1
result
end
# rubocop: disable Style/TrivialAccessors
def variables
@variables
end
# rubocop: enable Style/TrivialAccessors
def read(source, *steps)
current = source
steps.each do |step|
case current
when ::Hash
current = current[step]
when ::Array
return '' unless step.is_a?(::Integer)
current = current[step]
else
break
end
end
current
end
def truthy?(value)
value.respond_to?(:any?) ? value.any? : !!value
end
end
end
end
end
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