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Tilt::YajlTemplate

Yajl Template implementation

Yajl is a fast JSON parsing and encoding library for Ruby See github.com/brianmario/yajl-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)

Public Class Methods

engine_initialized?() click to toggle source 
# File lib/tilt/yajl.rb, line 45
def self.engine_initialized?
  defined? ::Yajl
end

Public Instance Methods

decorate(json) click to toggle source

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.

# File lib/tilt/yajl.rb, line 80
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
evaluate(scope, locals, &block) click to toggle source 
# File lib/tilt/yajl.rb, line 56
def evaluate(scope, locals, &block)
  decorate super(scope, locals, &block)
end
initialize_engine() click to toggle source 
# File lib/tilt/yajl.rb, line 49
def initialize_engine
  require_template_library 'yajl'
end
precompiled_postamble(locals) click to toggle source 
# File lib/tilt/yajl.rb, line 65
def precompiled_postamble(locals)
  "Yajl::Encoder.new.encode(json)"
end
precompiled_preamble(locals) click to toggle source 
# File lib/tilt/yajl.rb, line 60
def precompiled_preamble(locals)
  return super if locals.include? :json
  "json = {}\n#{super}"
end
precompiled_template(locals) click to toggle source 
# File lib/tilt/yajl.rb, line 69
def precompiled_template(locals)
  data.to_str
end
prepare() click to toggle source 
# File lib/tilt/yajl.rb, line 53
def prepare
end

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