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# frozen_string_literal: true
# = Yajl
#
# Yajl Template implementation
#
# Yajl is a fast JSON parsing and encoding library for Ruby
#
# The template source is evaluated as a Ruby string,
# and the result is converted #to_json.
#
# === Example
#
# # This is a template example.
# # The template can contain any Ruby statement.
# tpl <<-EOS
# @counter = 0
#
# # The json variable represents the buffer
# # and holds the data to be serialized into json.
# # It defaults to an empty hash, but you can override it at any time.
# json = {
# :"user#{@counter += 1}" => { :name => "Joshua Peek", :id => @counter },
# :"user#{@counter += 1}" => { :name => "Ryan Tomayko", :id => @counter },
# :"user#{@counter += 1}" => { :name => "Simone Carletti", :id => @counter },
# }
#
# # Since the json variable is a Hash,
# # you can use conditional statements or any other Ruby statement
# # to populate it.
# json[:"user#{@counter += 1}"] = { :name => "Unknown" } if 1 == 2
#
# # The last line doesn't affect the returned value.
# nil
# EOS
#
# template = Tilt::YajlTemplate.new { tpl }
# template.render(self)
#
# === See also
#
# * https://github.com/brianmario/yajl-ruby
#
# === Related module
#
# * Tilt::YajlTemplate
require_relative 'template'
require 'yajl'
module Tilt
class YajlTemplate < Template
self.default_mime_type = 'application/json'
def evaluate(scope, locals, &block)
decorate(super)
end
def precompiled_preamble(locals)
return super if locals.include? :json
"json = {}\n#{super}"
end
def precompiled_postamble(locals)
"Yajl::Encoder.new.encode(json)"
end
def precompiled_template(locals)
@data.to_str
end
# Decorates the +json+ input according to given +options+.
#
# json - The json String to decorate.
# options - The option Hash to customize the behavior.
#
# Returns the decorated String.
def decorate(json)
callback, variable = @options[:callback], @options[:variable]
if callback && variable
"var #{variable} = #{json}; #{callback}(#{variable});"
elsif variable
"var #{variable} = #{json};"
elsif callback
"#{callback}(#{json});"
else
json
end
end
end
end
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