Class: FlavourSaver::Runtime

Inherits:
Object
  • Object
show all
Defined in:
lib/flavour_saver/runtime.rb

Defined Under Namespace

Classes: BlockRuntime

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(ast, context = nil, locals = {}, helpers = [], parent = nil) ⇒ Runtime

Returns a new instance of Runtime.



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# File 'lib/flavour_saver/runtime.rb', line 17

def initialize(ast, context=nil, locals={}, helpers=[],parent=nil)
  @ast = ast
  @locals = locals
  @helpers = helpers
  @context = context
  @parent = parent
  @privates = parent ? parent.privates.dup : { 'root' => context }
end

Instance Attribute Details

#ast ⇒ Object

Returns the value of attribute ast.



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# File 'lib/flavour_saver/runtime.rb', line 11

def ast
  @ast
end

#context ⇒ Object

Returns the value of attribute context.



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# File 'lib/flavour_saver/runtime.rb', line 11

def context
  @context
end

#parent ⇒ Object

Returns the value of attribute parent.

Raises:



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# File 'lib/flavour_saver/runtime.rb', line 11

def parent
  @parent
end

#privates ⇒ Object

Returns the value of attribute privates.



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# File 'lib/flavour_saver/runtime.rb', line 11

def privates
  @privates
end

Class Method Details

.run(ast, context, locals = {}, helpers = []) ⇒ Object 



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# File 'lib/flavour_saver/runtime.rb', line 13

def self.run(ast, context, locals={}, helpers=[])
  self.new(ast, context, locals, helpers).to_s
end

Instance Method Details

#create_child_runtime(body = []) ⇒ Object 



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# File 'lib/flavour_saver/runtime.rb', line 200

def create_child_runtime(body=[])
  node = body.is_a?(TemplateNode) ? body : TemplateNode.new(body)
  Runtime.new(node,nil,@locals,@helpers,self)
end

#evaluate_argument(arg) ⇒ Object 



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# File 'lib/flavour_saver/runtime.rb', line 138

def evaluate_argument(arg)
  if arg.is_a? Array
    evaluate_object_path(arg)
  else
    evaluate_node(arg)
  end
end

#evaluate_block(node, block_context = @context) ⇒ Object 



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# File 'lib/flavour_saver/runtime.rb', line 156

def evaluate_block(node,block_context=@context)
  call = node.method.first
  content_runtime = create_child_runtime(node.contents)
  alternate_runtime = create_child_runtime(node.alternate) if node.respond_to? :alternate
  block_runtime = BlockRuntime.new(block_context,content_runtime,alternate_runtime)

  result = evaluate_call(call, block_context) { block_runtime }

  # If the helper fails to call it's provided block then all
  # sorts of wacky default behaviour kicks in. I don't like it,
  # but that's the spec.
  if !block_runtime.rendered?

    # If the result is collectiony then act as an implicit
    # "each"
    if result && result.respond_to?(:each)
      if result.respond_to?(:size) && (result.size > 0)
        r = []
        # Not using #each_with_index because the object might
        # not actually be an Enumerable
        count = 0
        result.each do |e|
          r << block_runtime.contents(e, {'index' => count})
          count += 1
        end
        result = r.join('')
      else
        result = block_runtime.inverse
      end

    # Otherwise it behaves as an implicit "if"
    elsif result
      result = block_runtime.contents result
    else
      if block_runtime.has_inverse?
        result = block_runtime.inverse
      else
        result = ''
      end
    end
  end
  result
end

#evaluate_call(call, context = self.context, &block) ⇒ Object 



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# File 'lib/flavour_saver/runtime.rb', line 118

def evaluate_call(call, context=self.context, &block)
  context = Helpers.decorate_with(context,@helpers,@locals) unless context.is_a? Helpers::Decorator
  case call
  when ParentCallNode
    depth = call.depth
    (2..depth).inject(parent) { |p| p.parent }.evaluate_call(call.to_callnode,&block)
  when LiteralCallNode
    result = context.send(:[], call.name)
    result = result.call(*call.arguments.map { |a| evaluate_argument(a) },&block) if result.respond_to? :call
    result
  when LocalVarNode
    result = private_variable_get(call.name)
  else
    if call.parent.is_a? BlockExpressionNode and !context.respond_to? call.name
      raise UnknownHelperException, "Template context doesn't respond to method #{call.name.inspect}."
    end
    context.public_send(call.name, *call.arguments.map { |a| evaluate_argument(a) }, &block)
  end
end

#evaluate_expression(node, &block) ⇒ Object 



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# File 'lib/flavour_saver/runtime.rb', line 152

def evaluate_expression(node, &block)
  evaluate_object_path(node.method)
end

#evaluate_node(node) ⇒ Object 



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# File 'lib/flavour_saver/runtime.rb', line 58

def evaluate_node(node)
  case node
  when TemplateNode
    node.items.map { |n| evaluate_node(n) }.join('')
  when BlockExpressionNode
    evaluate_block(node).to_s
  when OutputNode
    node.value
  when NumberNode
    if node.value =~ /\./
      node.value.to_f
    else
      node.value.to_i
    end
  when ValueNode
    node.value
  when SafeExpressionNode
    evaluate_expression(node).to_s
  when ExpressionNode
    escape(evaluate_expression(node).to_s)
  when CallNode
    evaluate_call(node)
  when Hash
    node.each do |key,value|
      node[key] = evaluate_argument(value)
    end
    node
  when CommentNode
    ''
  when PartialNode
    evaluate_partial(node)
  else
    raise UnknownNodeTypeException, "Don't know how to deal with a node of type #{node.class.to_s.inspect}."
  end
end

#evaluate_object_path(path, &block) ⇒ Object 



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# File 'lib/flavour_saver/runtime.rb', line 146

def evaluate_object_path(path, &block)
  path.inject(context) do |context,call|
    context = evaluate_call(call, context, &block)
  end
end

#evaluate_partial(node) ⇒ Object 



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# File 'lib/flavour_saver/runtime.rb', line 103

def evaluate_partial(node)
  _context = context
  _context = evaluate_argument(node.context) if node.context
  if defined?(::Rails)
    context.send(:render, :partial => node.name, :object => _context)
  else
    partial = Partial.fetch(node.name)
    if partial.respond_to? :call
      partial.call(_context)
    else
      create_child_runtime(partial).to_s(_context)
    end
  end
end

#inspect ⇒ Object 



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# File 'lib/flavour_saver/runtime.rb', line 205

def inspect
  "#<FlavourSaver::Runtime contents=#{@ast.inspect}>"
end

#parent? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/flavour_saver/runtime.rb', line 99

def parent?
  !!@parent
end

#private_variable_get(name) ⇒ Object 



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# File 'lib/flavour_saver/runtime.rb', line 46

def private_variable_get(name)
  begin
    @privates.fetch(name)
  rescue KeyError
    raise UndefinedPrivateVariableException, "private variable not found @#{name}"
  end
end

#private_variable_set(name, value) ⇒ Object 



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# File 'lib/flavour_saver/runtime.rb', line 42

def private_variable_set(name,value)
  @privates[name.to_s] = value
end

#strip(tmp_context = nil) ⇒ Object 



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# File 'lib/flavour_saver/runtime.rb', line 54

def strip(tmp_context = nil)
  self.to_s(tmp_context).gsub(/[\s]+/,' ').strip
end

#to_s(tmp_context = nil, privates = {}) ⇒ Object 



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# File 'lib/flavour_saver/runtime.rb', line 26

def to_s(tmp_context = nil,privates={})
  result = nil
  if tmp_context
    old_context = @context
    @context = tmp_context
    old_privates = @privates
    @privates = @privates.dup.merge(privates) if privates.any?
    result = evaluate_node(@ast)
    @privates = old_privates
    @context = old_context
  else
    result = evaluate_node(@ast).to_s.force_encoding(Encoding::default_external)
  end
  result
end