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

- (Enumerable) initialize(path, object, options = nil)

A new instance of Enumerable



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

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

Instance Attribute Details

- (Object) allow_eval (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

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



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# File 'lib/jsonpath/enumerable.rb', line 13

def each(context = @object, key = nil, pos = 0, &blk)
  node = key ? context[key] : context
  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 ??
        (node.is_a?(Hash) ? node.keys : (0..node.size)).each do |e|
          subenum = ::JsonPath.new(sub_path[2, sub_path.size - 3]).on(node[e])
          each(node, e, pos + 1, &blk) if subenum.any?{|n| true}
        end
      else
        if node.is_a?(Array)
          @obj = node
          array_args = sub_path.gsub('@','@obj').split(':')
          start_idx = process_function_or_literal(array_args[0], 0)
          next unless start_idx
          start_idx %= node.size
          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_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