Module: Cel::Encoder

Defined in:
lib/cel/encoder.rb

Class Method Summary collapse

Class Method Details

.decode(enc) ⇒ Object 



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# File 'lib/cel/encoder.rb', line 68

def decode(enc)
  case enc
  in ["group", stmt]
    Group.new(decode(stmt))
  in ["inv", var, ::String => func, *args]
    args = if func == "[]" && args.size == 1
      decode(args.first)
    elsif args.empty?
      nil
    else
      args.map(&method(:decode))
    end
    Invoke.new(func: func, var: decode(var), args: args)
  in ["inv", ::String => func, *args]
    args = nil if args.empty?
    Invoke.new(func: func, args: args.map(&method(:decode)))
  in ["op", ::String => op, *args]
    Operation.new(op, args.map(&method(:decode)))
  in ["cond", f, th, el]
    Condition.new(decode(f), decode(th), decode(el))
  in ["id", ::String => type, ::String => val]
    id = Identifier.new(val)
    id.type = TYPES[type.to_sym]
    id
  in ["lit", "list", *items]
    List.new(items.map(&method(:decode)))

  in ["lit", "map", items]
    Map.new(decode(items))
  in ["lit", /\Aint|uint|double\z/ => type, Integer => val]
    Number.new(type.to_sym, val)
  in ["lit", "bool", val]
    Bool.cast(val)
  in ["lit", "string", val]
    String.new(val)
  in ["lit", "bytes", val]
    Bytes.new(val)
  in ["lit", "null"]
    Null::INSTANCE
  in ["lit", "type", type]
    TYPES[type.to_sym]
  in ["message", name, struct]
    Cel::Message.new(name, decode(struct))
  in **items
    items.to_h { |*kv| kv.map(&method(:decode)) }
  in *items
    items.map(&method(:decode)).each_slice(2)
  else
    enc
  end
end

.encode(expr) ⇒ Object 



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# File 'lib/cel/encoder.rb', line 7

def encode(expr)
  case expr
  when Group
    ["group", encode(expr.value)]
  when Invoke
    enc = [
      "inv",
      (encode(expr.var) if expr.var),
      expr.func.to_s,
      *(if expr.args
          expr.func == :[] ? [encode(expr.args)] : expr.args.map(&method(:encode))
        end),
    ]
    enc.compact!
    enc
  when Operation
    [
      "op",
      expr.op.to_s,
      *expr.operands.map(&method(:encode)),
    ]
  when Condition
    [
      "cond",
      encode(expr.if),
      encode(expr.then),
      encode(expr.else),
    ]
  when Identifier
    [
      "id",
      expr.type.to_s,
      expr.id.to_s,
    ]
  when List, Map
    [
      "lit",
      expr.type.to_s,
      *encode(expr.value),
    ]
  when Message
    [
      "message",
      expr.name.to_s,
      encode(expr.struct),
    ]
  when Number, Bool, String, Bytes
    ["lit", expr.type.to_s, expr.value]
  when Null
    %w[lit null]
  when Type
    ["lit", "type", expr.to_s]
  when Array
    expr.map(&method(:encode))
  when Hash
    expr.to_h { |*kv| kv.map(&method(:encode)) }
  else
    expr
  end
end