Class: JsonPath::Enumerable

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/jsonpath/enumerable.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(path, object, mode, options = nil) ⇒ Enumerable

Returns a new instance of Enumerable.



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# File 'lib/jsonpath/enumerable.rb', line 7

def initialize(path, object, mode, options = nil)
  @path, @object, @mode, @options = path.path, object, mode, options
  @allow_eval = @options && @options.key?(:allow_eval) ? @options[:allow_eval] : true
end

Instance Attribute Details

#allow_eval ⇒ Object (readonly) Also known as: allow_eval?

Returns the value of attribute allow_eval.



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# File 'lib/jsonpath/enumerable.rb', line 4

def allow_eval
  @allow_eval
end

Instance Method Details

#each(context = @object, key = nil, pos = 0, &blk) ⇒ Object 



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# File 'lib/jsonpath/enumerable.rb', line 12

def each(context = @object, key = nil, pos = 0, &blk)
  node = key ? context[key] : context
  @_current_node = node
  return yield_value(blk, context, key) if pos == @path.size
  case expr = @path[pos]
  when '*', '..'
    each(context, key, pos + 1, &blk)
  when '$'
    each(context, key, pos + 1, &blk) if node == @object
  when '@'
    each(context, key, pos + 1, &blk)
  when /^\[(.*)\]$/
    expr[1,expr.size - 2].split(',').each do |sub_path|
      case sub_path[0]
      when ?', ?"
        if node.is_a?(Hash)
          k = sub_path[1,sub_path.size - 2]
          each(node, k, pos + 1, &blk) if node.key?(k)
        end
      when ??
        raise "Cannot use ?(...) unless eval is enabled" unless allow_eval?
        case node
        when Hash, Array
          (node.is_a?(Hash) ? node.keys : (0..node.size)).each do |e|
            each(node, e, pos + 1) { |n|
              @_current_node = n
              yield n if process_function_or_literal(sub_path[1, sub_path.size - 1])
            }
          end
        else
          yield node if process_function_or_literal(sub_path[1, sub_path.size - 1])
        end
      else
        if node.is_a?(Array)
          array_args = sub_path.split(':')
          if array_args[0] == ?*
            start_idx = 0
            end_idx = node.size - 1
          else
            start_idx = process_function_or_literal(array_args[0], 0)
            next unless start_idx
            end_idx = (array_args[1] && process_function_or_literal(array_args[1], -1) || (sub_path.count(':') == 0 ? start_idx : -1))
            next unless end_idx
          end
          start_idx %= node.size
          end_idx %= node.size
          step = process_function_or_literal(array_args[2], 1)
          next unless step
          (start_idx..end_idx).step(step) {|i| each(node, i, pos + 1, &blk)}
        end
      end
    end
  else
    if pos == (@path.size - 1) && node && allow_eval?
      if eval("node #{@path[pos]}")
        yield_value(blk, context, key)
      end
    end
  end

  if pos > 0 && @path[pos-1] == '..'
    case node
    when Hash  then node.each {|k, v| each(node, k, pos, &blk) }
    when Array then node.each_with_index {|n, i| each(node, i, pos, &blk) }
    end
  end
end