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Contents
# frozen_string_literal: true
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 = /\A#{QuotedFragment}+/o
NamedSyntax = /\A(#{QuotedFragment})\s*\:\s*(.*)/om
attr_reader :variables
def initialize(tag_name, markup, options)
super
case markup
when NamedSyntax
@variables = variables_from_string(Regexp.last_match(2))
@name = parse_expression(Regexp.last_match(1))
when SimpleSyntax
@variables = variables_from_string(markup)
@name = @variables.to_s
else
raise SyntaxError, options[:locale].t("errors.syntax.cycle")
end
end
def render_to_output_buffer(context, output)
context.registers[:cycle] ||= {}
key = context.evaluate(@name)
iteration = context.registers[:cycle][key].to_i
val = context.evaluate(@variables[iteration])
if val.is_a?(Array)
val = val.join
elsif !val.is_a?(String)
val = val.to_s
end
output << val
iteration += 1
iteration = 0 if iteration >= @variables.size
context.registers[:cycle][key] = iteration
output
end
private
def variables_from_string(markup)
markup.split(',').collect do |var|
var =~ /\s*(#{QuotedFragment})\s*/o
Regexp.last_match(1) ? parse_expression(Regexp.last_match(1)) : nil
end.compact
end
class ParseTreeVisitor < Liquid::ParseTreeVisitor
def children
Array(@node.variables)
end
end
end
Template.register_tag('cycle', Cycle)
end
Version data entries
5 entries across 5 versions & 1 rubygems