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python_encoder.rb
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73 lines (64 loc) · 1.78 KB
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#
# Copyright 2015-2017, Noah Kantrowitz
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require 'json'
module PoisePython
module Utils
# Convert Ruby data structures to a Python literal. Overall similar to JSON
# but just different enough that I need to write this. Thanks Obama.
#
# @since 1.0.0
# @api private
class PythonEncoder
def initialize(root, depth_limit: 100)
@root = root
@depth_limit = depth_limit
end
def encode
encode_obj(@root, 0)
end
private
def encode_obj(obj, depth)
raise ArgumentError.new("Depth limit exceeded") if depth > @depth_limit
case obj
when Hash
encode_hash(obj, depth)
when Array
encode_array(obj, depth)
when true
'True'
when false
'False'
when nil
'None'
else
obj.to_json
end
end
def encode_hash(obj, depth)
middle = obj.map do |key, value|
"#{encode_obj(key, depth+1)}:#{encode_obj(value, depth+1)}"
end
"{#{middle.join(',')}}"
end
def encode_array(obj, depth)
middle = obj.map do |value|
encode_obj(value, depth+1)
end
"[#{middle.join(',')}]"
end
end
end
end