third_party/cython/src/Tools/site_scons/site_tools/cython.py

   1 """
   2 Tool to run Cython files (.pyx) into .c and .cpp.
   3
   4 TODO:
   5  - Add support for dynamically selecting in-process Cython
   6    through CYTHONINPROCESS variable.
   7  - Have a CYTHONCPP option which turns on C++ in flags and
   8    changes output extension at the same time
   9
  10 VARIABLES:
  11  - CYTHON - The path to the "cython" command line tool.
  12  - CYTHONFLAGS - Flags to pass to the "cython" command line tool.
  13
  14 AUTHORS:
  15  - David Cournapeau
  16  - Dag Sverre Seljebotn
  17
  18 """
  19 import SCons
  20 from SCons.Builder import Builder
  21 from SCons.Action import Action
  22
  23 #def cython_action(target, source, env):
  24 #    print target, source, env
  25 #    from Cython.Compiler.Main import compile as cython_compile
  26 #    res = cython_compile(str(source[0]))
  27
  28 cythonAction = Action("$CYTHONCOM")
  29
  30 def create_builder(env):
  31     try:
  32         cython = env['BUILDERS']['Cython']
  33     except KeyError:
  34         cython = SCons.Builder.Builder(
  35                   action = cythonAction,
  36                   emitter = {},
  37                   suffix = cython_suffix_emitter,
  38                   single_source = 1)
  39         env['BUILDERS']['Cython'] = cython
  40
  41     return cython
  42
  43 def cython_suffix_emitter(env, source):
  44     return "$CYTHONCFILESUFFIX"
  45
  46 def generate(env):
  47     env["CYTHON"] = "cython"
  48     env["CYTHONCOM"] = "$CYTHON $CYTHONFLAGS -o $TARGET $SOURCE"
  49     env["CYTHONCFILESUFFIX"] = ".c"
  50
  51     c_file, cxx_file = SCons.Tool.createCFileBuilders(env)
  52
  53     c_file.suffix['.pyx'] = cython_suffix_emitter
  54     c_file.add_action('.pyx', cythonAction)
  55
  56     c_file.suffix['.py'] = cython_suffix_emitter
  57     c_file.add_action('.py', cythonAction)
  58
  59     create_builder(env)
  60
  61 def exists(env):
  62     try:
  63 #        import Cython
  64         return True
  65     except ImportError:
  66         return False