Class: Wunderbar::JsonBuilder

Inherits:

BuilderBase

• Object
• BuilderBase
• Wunderbar::JsonBuilder

Defined in:

lib/wunderbar/builder.rb

Instance Method Summary

• #_!(object) ⇒ Object
• #_exception(*args) ⇒ Object
• #encode(&block) ⇒ Object
• #initialize(scope) ⇒ JsonBuilder constructor

  A new instance of JsonBuilder.

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

  forward to Wunderbar, @_target, or @_scope.

• #target! ⇒ Object

Methods inherited from BuilderBase

#get_binding, #set_variables_from_params

Constructor Details

#initialize(scope) ⇒ JsonBuilder

Returns a new instance of JsonBuilder.

# File 'lib/wunderbar/builder.rb', line 292

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

# File 'lib/wunderbar/builder.rb', line 304

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 = object.map do |item|
        args.inject({}) {|hash, arg| hash[arg.to_s] = item.send arg; hash}
      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

# File 'lib/wunderbar/builder.rb', line 368

def _!(object)
  @_target = object
end

#_exception(*args) ⇒ Object

# File 'lib/wunderbar/builder.rb', line 372

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

# File 'lib/wunderbar/builder.rb', line 297

def encode(&block)
  set_variables_from_params
  self.instance_eval(&block)
  @_target
end

#target! ⇒ Object

# File 'lib/wunderbar/builder.rb', line 388

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