Method: JSONSelect#initialize

Defined in:
lib/json_select/selector.rb

#initialize(src, use_parser_cache = true) ⇒ JSONSelect

Returns a new instance of JSONSelect.



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# File 'lib/json_select/selector.rb', line 11

def initialize(src, use_parser_cache=true)
  case src

  when String
    ast = nil

    if use_parser_cache
      ast = @@parser_cache[src]
    end

    if ast
      @ast = ast

    else
      parser = JSONSelect::SelectorParser.new
      tree   = parser.parse(src)
      unless tree
        raise JSONSelect::ParseError, parser.failure_reason
      end

      @ast = tree.to_ast

      if use_parser_cache
        @@parser_cache[src] = ast
      end
    end

  when Array
    @ast = src

  else
    raise ArgumentError, "Expected a string for ast"

  end

  @helpers = Module.new
  @helpers.send(:extend,
    JSONSelect::KeyHelpers,
    JSONSelect::TypeHelpers,
    JSONSelect::SizeHelpers,
    JSONSelect::DepthHelpers,
    JSONSelect::PositionHelpers)

  @helper_methods = {}
  (@helpers.public_methods - Module.public_methods).map do |name|
    @helper_methods[name.to_sym] = @helpers.method(name)
  end
end