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1# 

2# LSST Data Management System 

3# Copyright 2017 LSST/AURA. 

4# 

5# This product includes software developed by the 

6# LSST Project (http://www.lsst.org/). 

7# 

8# This program is free software: you can redistribute it and/or modify 

9# it under the terms of the GNU General Public License as published by 

10# the Free Software Foundation, either version 3 of the License, or 

11# (at your option) any later version. 

12# 

13# This program is distributed in the hope that it will be useful, 

14# but WITHOUT ANY WARRANTY; without even the implied warranty of 

15# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

16# GNU General Public License for more details. 

17# 

18# You should have received a copy of the LSST License Statement and 

19# the GNU General Public License along with this program. If not, 

20# see <http://www.lsstcorp.org/LegalNotices/>. 

21# 

22 

23from .python import transformRegistry 

24 

25__all__ = ["transformFromString"] 

26 

27 

28def transformFromString(data): 

29 """Read a Transform from a string that was saved using 

30 ``Transform.writeString`` 

31 

32 Unlike ``Transform.readString``, you need not know the ``Transform`` class in 

33 advance 

34 

35 Parameters 

36 ---------- 

37 data : `str` 

38 A string in the format produced by ``Transform.writeString``. 

39 

40 Returns 

41 ------- 

42 transform : a ``Transform`` class 

43 An object of the same type used to create ``data``. 

44 """ 

45 version, transformClassName, remainder = data.split(" ", 2) 

46 try: 

47 transformClass = transformRegistry[transformClassName] 

48 except LookupError: 

49 raise RuntimeError(f"Unknown transform class {transformClassName!r}") 

50 

51 return transformClass.readString(data)