Class: Wunderbar::JsonBuilder

Inherits:
BuilderClass show all
Defined in:
lib/wunderbar/builder.rb

Instance Method Summary collapse

Methods inherited from BuilderClass

#websocket

Methods inherited from BuilderBase

#get_binding, #set_variables_from_params

Constructor Details

#initialize(scope) ⇒ JsonBuilder

Returns a new instance of JsonBuilder.



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# File 'lib/wunderbar/builder.rb', line 475

def initialize(scope)
  @_scope = scope
  @_target = {}
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args, &block) ⇒ Object

forward to Wunderbar, @_target, or @_scope



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# File 'lib/wunderbar/builder.rb', line 489

def method_missing(method, *args, &block)

  if method.to_s =~ /^_(\w*)$/
    name = $1
  elsif Wunderbar.respond_to? method
    return Wunderbar.send method, *args, &block
  elsif @_target.respond_to? method
    return @_target.send method, *args, &block
  elsif @_scope and @_scope.respond_to? method
    return @_scope.send method, *args, &block
  else
    super
  end

  if args.length == 0
    return self unless block
    result = JsonBuilder.new(@_scope).encode(&block)
  elsif args.length == 1
    result = args.first

    if block
      if Symbol === result or String === result
        result = {result.to_s => JsonBuilder.new(@_scope).encode(&block)}
      else
        result = result.map {|n| @_target = {}; block.call(n); @_target} 
      end
    end
  elsif block
    ::Kernel::raise ::ArgumentError, 
      "can't mix multiple arguments with a block"
  else
    object = args.shift

    if not Enumerable === object or String === object or Struct === object
      result = {}
      args.each {|arg| result[arg.to_s] = object.send arg}
    else
      result = []
      result = @_target if name.empty? and @_target.respond_to? :<<
      object.each do |item|
        result << Hash[args.map {|arg| [arg.to_s, item.send(arg)]}]
      end
    end
  end

  if name != ''
    unless Hash === @_target or @_target.empty?
      ::Kernel::raise ::ArgumentError, "mixed array and hash calls"
    end

    @_target[name.to_s] = result
  elsif args.length == 0 or (args.length == 1 and not block)
    @_target = [] if @_target == {}

    if Hash === @_target 
      ::Kernel::raise ::ArgumentError, "mixed hash and array calls"
    end

    @_target << result
  else
    @_target = result
  end

  self
end

Instance Method Details

#_!(object) ⇒ Object 



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# File 'lib/wunderbar/builder.rb', line 555

def _!(object)
  @_target = object
end

#_exception(*args) ⇒ Object 



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# File 'lib/wunderbar/builder.rb', line 559

def _exception(*args)
  exception = args.first
  if exception.respond_to? :backtrace
    Wunderbar.error exception.inspect
    super(exception.inspect)
    @_target['backtrace'] = []
    exception.backtrace.each do |frame| 
      next if CALLERS_TO_IGNORE.any? {|re| frame =~ re}
      Wunderbar.warn "  #{frame}"
      @_target['backtrace'] << frame 
    end
  else
    super
  end
end

#encode(&block) ⇒ Object 



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# File 'lib/wunderbar/builder.rb', line 480

def encode(&block)
  set_variables_from_params
  before = @_target.dup
  result = self.instance_eval(&block)
  _! result if before.empty? and result and @_target == before
  @_target
end

#system(*args) ⇒ Object

execute a system command, echoing stdin, stdout, and stderr



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# File 'lib/wunderbar/builder.rb', line 576

def system(*args)
  opts = {}
  opts = args.pop if Hash === args.last

  transcript = opts[:transcript]  || 'transcript'
  output_prefix = opts[:prefix] || {}
  output_prefix[:stdin]  ||= '$ '

  if @_target[transcript]
    @_target[transcript] << ''
  else
    @_target[transcript] = []
  end

  super do |kind, line|
    @_target[transcript] << "#{output_prefix[kind]}#{line}"
  end
end

#system!(*args) ⇒ Object

execute a system command, ensuring the result is a success

Raises:

  • (RuntimeError) 


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# File 'lib/wunderbar/builder.rb', line 596

def system!(*args)
  rc = system(args)
  
  raise RuntimeError.new("exit code: #{rc}") if rc != 0

  rc
end

#target! ⇒ Object 



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# File 'lib/wunderbar/builder.rb', line 604

def target!
  begin
    JSON.pretty_generate(@_target)+ "\n"
  rescue
    @_target.to_json + "\n"
  end
end

#target?(type = nil) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/wunderbar/builder.rb', line 612

def target?(type=nil)
  if Class === type
    type === @_target
  else
    @_target
  end
end