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Contents
module Liquid
# Cycle is usually used within a loop to alternate between values, like colors or DOM classes.
#
# {% for item in items %}
# <div class="{% cycle 'red', 'green', 'blue' %}"> {{ item }} </div>
# {% end %}
#
# <div class="red"> Item one </div>
# <div class="green"> Item two </div>
# <div class="blue"> Item three </div>
# <div class="red"> Item four </div>
# <div class="green"> Item five</div>
#
class Cycle < Tag
SimpleSyntax = /^#{QuotedFragment}+/o
NamedSyntax = /^(#{QuotedFragment})\s*\:\s*(.*)/o
def initialize(tag_name, markup, tokens)
case markup
when NamedSyntax
@variables = variables_from_string($2)
@name = $1
when SimpleSyntax
@variables = variables_from_string(markup)
@name = "'#{@variables.to_s}'"
else
raise SyntaxError.new("Syntax Error in 'cycle' - Valid syntax: cycle [name :] var [, var2, var3 ...]")
end
super
end
def render(context)
context.registers[:cycle] ||= Hash.new(0)
context.stack do
key = context[@name]
iteration = context.registers[:cycle][key]
result = context[@variables[iteration]]
iteration += 1
iteration = 0 if iteration >= @variables.size
context.registers[:cycle][key] = iteration
result
end
end
private
def variables_from_string(markup)
markup.split(',').collect do |var|
var =~ /\s*(#{QuotedFragment})\s*/o
$1 ? $1 : nil
end.compact
end
end
Template.register_tag('cycle', Cycle)
end
Version data entries
6 entries across 6 versions & 2 rubygems