Class: Rna::DSL

Inherits:
Object
  • Object
show all
Defined in:
lib/rna/dsl.rb

Defined Under Namespace

Classes: Builder, Role, Rule

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ DSL

Returns a new instance of DSL.



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# File 'lib/rna/dsl.rb', line 4

def initialize(options={})
  @options = options.dup
  @project_root = options[:project_root] || '.'
  @path = "#{@project_root}/config/rna.rb"
  @options[:output_path] = "#{@project_root}/output"

  @before = nil
  @after = nil
  @roles = []
end

Instance Attribute Details

#data ⇒ Object (readonly)

Returns the value of attribute data.



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# File 'lib/rna/dsl.rb', line 3

def data
  @data
end

#jsons ⇒ Object (readonly)

Returns the value of attribute jsons.



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# File 'lib/rna/dsl.rb', line 3

def jsons
  @jsons
end

Instance Method Details

#after(&block) ⇒ Object 



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# File 'lib/rna/dsl.rb', line 42

def after(&block)
  @after = {:block => block}
end

#before(&block) ⇒ Object 



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# File 'lib/rna/dsl.rb', line 38

def before(&block)
  @before = {:block => block}
end

#build ⇒ Object 



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# File 'lib/rna/dsl.rb', line 62

def build
  @data = {:roles => []}
  # build roles
  @roles.each do |r|
    @data[:roles] << Role.new(r[:name], r[:block], @options).build
  end
  @data
end

#default_includes(role) ⇒ Object 



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# File 'lib/rna/dsl.rb', line 34

def default_includes(role)
  Role.default_includes = role
end

#each_role(name, &block) ⇒ Object 



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# File 'lib/rna/dsl.rb', line 50

def each_role(name, &block)
  @roles << {:name => name, :block => block}
end

#evaluate ⇒ Object 



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# File 'lib/rna/dsl.rb', line 15

def evaluate
  instance_eval(File.read(@path), @path)
  load_roles
end

#load_roles ⇒ Object

load any roles defined in project/config/rna/*



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# File 'lib/rna/dsl.rb', line 21

def load_roles
  Dir.glob("#{File.dirname(@path)}/rna/*").each do |path|
    instance_eval(File.read(path), path)
  end
end

#output(options = {}) ⇒ Object 



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# File 'lib/rna/dsl.rb', line 107

def output(options={})
  jsons = {}
  @jsons.each do |role,data|
    role_data = @data[:roles].find {|h| h[:name] == role}
    if role_data[:output]
      jsons[role] = JSON.pretty_generate(data)
    end
  end

  outputer = options[:output] || 'filesystem'
  outputer_class = Rna.const_get(outputer.capitalize)
  puts "Building node.json files:" if options[:verbose]
  outputer_class.new(options).run(jsons)
end

#process ⇒ Object 



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# File 'lib/rna/dsl.rb', line 71

def process
  @jsons = {}
  roles = @data[:roles].collect{|h| h[:name]}
  roles.each do |role|
    @jsons[role] = process_role(role)
  end
  @jsons
end

#process_role(role, depth = 1) ⇒ Object

builds node.json hash

  1. pre rule

  2. role, going up the includes chain

  3. post rule



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# File 'lib/rna/dsl.rb', line 84

def process_role(role, depth=1)
  role_data = @data[:roles].find {|h| h[:name] == role}
  includes = role_data[:includes]
  if includes
    json = process_role(includes, depth+1)
  else
    json = {}
    if @before
      pre_data = Rule.new(role, @before[:block]).build
      json.deep_merge!(pre_data[:attributes])
    end
  end

  attributes = role_data[:attributes] || {}
  json.deep_merge!(attributes)
  # only process post rule at the very last step
  if @after and depth == 1
    post_data = Rule.new(role, @after[:block]).build
    json.deep_merge!(post_data[:attributes])
  end
  json
end

#role(*names, &block) ⇒ Object 



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# File 'lib/rna/dsl.rb', line 46

def role(*names, &block)
  names.flatten.each {|name| each_role(name, &block) }
end

#run ⇒ Object 



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# File 'lib/rna/dsl.rb', line 54

def run
  puts "Generating rna files" unless @options[:quiet]
  evaluate
  build
  process
  @options.empty? ? output : output(@options)
end

#settings ⇒ Object Also known as: set, node, default 



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# File 'lib/rna/dsl.rb', line 27

def settings
  @settings ||= Node.new
end