Class: Tilt::YajlTemplate

Inherits:
Template show all
Defined in:
lib/tilt/yajl.rb

Overview

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 "  @counter = 0\n\n  # The json variable represents the buffer\n  # and holds the data to be serialized into json.\n  # It defaults to an empty hash, but you can override it at any time.\n  json = {\n    :\"user\#{@counter += 1}\" => { :name => \"Joshua Peek\", :id => @counter },\n    :\"user\#{@counter += 1}\" => { :name => \"Ryan Tomayko\", :id => @counter },\n    :\"user\#{@counter += 1}\" => { :name => \"Simone Carletti\", :id => @counter },\n  }\n\n  # Since the json variable is a Hash,\n  # you can use conditional statements or any other Ruby statement\n  # to populate it.\n  json[:\"user\#{@counter += 1}\"] = { :name => \"Unknown\" } if 1 == 2\n\n  # The last line doesn't affect the returned value.\n  nil\n"

template = Tilt::YajlTemplate.new { tpl }
template.render(self)

Instance Attribute Summary

Attributes inherited from Template

#data, #file, #line, #options

Instance Method Summary collapse

Methods inherited from Template

#basename, default_mime_type, default_mime_type=, #eval_file, #initialize, metadata, #metadata, #name, #render

Constructor Details

This class inherits a constructor from Tilt::Template

Instance Method Details

#decorate(json) ⇒ Object

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.



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# File 'lib/tilt/yajl.rb', line 73

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) ⇒ Object 



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# File 'lib/tilt/yajl.rb', line 49

def evaluate(scope, locals, &block)
  decorate super(scope, locals, &block)
end

#precompiled_postamble(locals) ⇒ Object 



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# File 'lib/tilt/yajl.rb', line 58

def precompiled_postamble(locals)
  "Yajl::Encoder.new.encode(json)"
end

#precompiled_preamble(locals) ⇒ Object 



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# File 'lib/tilt/yajl.rb', line 53

def precompiled_preamble(locals)
  return super if locals.include? :json
  "json = {}\n#{super}"
end

#precompiled_template(locals) ⇒ Object 



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# File 'lib/tilt/yajl.rb', line 62

def precompiled_template(locals)
  data.to_str
end

#prepare ⇒ Object 



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# File 'lib/tilt/yajl.rb', line 46

def prepare
end