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Contents
module Liquid
# decrement is used in a place where one needs to insert a counter
# into a template, and needs the counter to survive across
# multiple instantiations of the template.
# NOTE: decrement is a pre-decrement, --i,
# while increment is post: i++.
#
# (To achieve the survival, the application must keep the context)
#
# if the variable does not exist, it is created with value 0.
# Hello: {% decrement variable %}
#
# gives you:
#
# Hello: -1
# Hello: -2
# Hello: -3
#
class Decrement < Tag
def initialize(tag_name, markup, options)
super
@variable = markup.strip
end
def render(context)
value = context.environments.first[@variable] ||= 0
value -= 1
context.environments.first[@variable] = value
value.to_s
end
end
Template.register_tag('decrement'.freeze, Decrement)
end
Version data entries
11 entries across 11 versions & 3 rubygems