flex.py (1553B)
1 #!/usr/bin/env python 2 # encoding: utf-8 3 # John O'Meara, 2006 4 # Thomas Nagy, 2006-2018 (ita) 5 6 """ 7 The **flex** program is a code generator which creates C or C++ files. 8 The generated files are compiled into object files. 9 """ 10 11 import os, re 12 from waflib import Task, TaskGen 13 from waflib.Tools import ccroot 14 15 def decide_ext(self, node): 16 if 'cxx' in self.features: 17 return ['.lex.cc'] 18 return ['.lex.c'] 19 20 def flexfun(tsk): 21 env = tsk.env 22 bld = tsk.generator.bld 23 wd = bld.variant_dir 24 def to_list(xx): 25 if isinstance(xx, str): 26 return [xx] 27 return xx 28 tsk.last_cmd = lst = [] 29 lst.extend(to_list(env.FLEX)) 30 lst.extend(to_list(env.FLEXFLAGS)) 31 inputs = [a.path_from(tsk.get_cwd()) for a in tsk.inputs] 32 if env.FLEX_MSYS: 33 inputs = [x.replace(os.sep, '/') for x in inputs] 34 lst.extend(inputs) 35 lst = [x for x in lst if x] 36 txt = bld.cmd_and_log(lst, cwd=wd, env=env.env or None, quiet=0) 37 tsk.outputs[0].write(txt.replace('\r\n', '\n').replace('\r', '\n')) # issue #1207 38 39 TaskGen.declare_chain( 40 name = 'flex', 41 rule = flexfun, # issue #854 42 ext_in = '.l', 43 decider = decide_ext, 44 ) 45 46 # To support the following: 47 # bld(features='c', flexflags='-P/foo') 48 Task.classes['flex'].vars = ['FLEXFLAGS', 'FLEX'] 49 ccroot.USELIB_VARS['c'].add('FLEXFLAGS') 50 ccroot.USELIB_VARS['cxx'].add('FLEXFLAGS') 51 52 def configure(conf): 53 """ 54 Detect the *flex* program 55 """ 56 conf.find_program('flex', var='FLEX') 57 conf.env.FLEXFLAGS = ['-t'] 58 59 if re.search (r"\\msys\\[0-9.]+\\bin\\flex.exe$", conf.env.FLEX[0]): 60 # this is the flex shipped with MSYS 61 conf.env.FLEX_MSYS = True 62