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 <<-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)

Instance Attribute Summary

Attributes inherited from Template

#compiled_path, #data, #file, #line, #options

Instance Method Summary collapse

Methods inherited from Template

#basename, #compiled_method, 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 68

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 45

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

#precompiled_postamble(locals) ⇒ Object 



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# File 'lib/tilt/yajl.rb', line 54

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

#precompiled_preamble(locals) ⇒ Object 



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

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 58

def precompiled_template(locals)
  @data.to_str
end