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Contents
require 'jsonpath'
module Krikri
##
# JsonParser
# @see Krikri::Parser
class JsonParser < Krikri::Parser
##
# @param record [Krikri::OriginalRecord] a record whose properties can
# be parsed by the parser instance.
# @param root_path [String] JsonPath that identifies the root path for
# the desired parse root.
# @see http://goessner.net/articles/JsonPath/ JsonPath
def initialize(record, root_path = '$')
@root = Value.new(JsonPath.on(record.content, root_path).first)
super(record)
end
##
# JsonParser::Value
# @see Krikri::Parser::Value
class Value < Krikri::Parser::Value
attr_accessor :node
def initialize(node)
@node = node
end
def attributes
raise NotImplementedError, 'Attributes are not supported for JSON'
end
def children
@node.is_a?(Hash) ? @node.keys : []
end
def value
@node.is_a?(Hash) ? nil : @node
end
def values?
!select_values.empty?
end
private
##
# @see Krikri::Parser#get_child_nodes
#
# @param name_exp [String] Object property name
# @return [Krikri::Parser::ValueArray]
def get_child_nodes(name)
if @node[name].is_a?(Array)
vals = @node[name].map { |node| self.class.new(node) }
else
vals = Array(self.class.new(@node[name]))
end
vals.reject! { |n| n.node.nil? }
Krikri::Parser::ValueArray.new(vals)
end
def attribute(name)
msg = "Attributes are not supported for JSON; got attribute `#{name}`"
raise NotImplementedError, msg
end
def select_values
@node.is_a?(Hash) ? [] : @node
end
end
end
end
Version data entries
33 entries across 33 versions & 1 rubygems