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+#!/usr/bin/env python
+# encoding: utf-8
+# John O'Meara, 2006
+# Thomas Nagy, 2006-2018 (ita)
+
+"""
+The **flex** program is a code generator which creates C or C++ files.
+The generated files are compiled into object files.
+"""
+
+import os, re
+from waflib import Task, TaskGen
+from waflib.Tools import ccroot
+
+def decide_ext(self, node):
+ if 'cxx' in self.features:
+ return ['.lex.cc']
+ return ['.lex.c']
+
+def flexfun(tsk):
+ env = tsk.env
+ bld = tsk.generator.bld
+ wd = bld.variant_dir
+ def to_list(xx):
+ if isinstance(xx, str):
+ return [xx]
+ return xx
+ tsk.last_cmd = lst = []
+ lst.extend(to_list(env.FLEX))
+ lst.extend(to_list(env.FLEXFLAGS))
+ inputs = [a.path_from(tsk.get_cwd()) for a in tsk.inputs]
+ if env.FLEX_MSYS:
+ inputs = [x.replace(os.sep, '/') for x in inputs]
+ lst.extend(inputs)
+ lst = [x for x in lst if x]
+ txt = bld.cmd_and_log(lst, cwd=wd, env=env.env or None, quiet=0)
+ tsk.outputs[0].write(txt.replace('\r\n', '\n').replace('\r', '\n')) # issue #1207
+
+TaskGen.declare_chain(
+ name = 'flex',
+ rule = flexfun, # issue #854
+ ext_in = '.l',
+ decider = decide_ext,
+)
+
+# To support the following:
+# bld(features='c', flexflags='-P/foo')
+Task.classes['flex'].vars = ['FLEXFLAGS', 'FLEX']
+ccroot.USELIB_VARS['c'].add('FLEXFLAGS')
+ccroot.USELIB_VARS['cxx'].add('FLEXFLAGS')
+
+def configure(conf):
+ """
+ Detect the *flex* program
+ """
+ conf.find_program('flex', var='FLEX')
+ conf.env.FLEXFLAGS = ['-t']
+
+ if re.search (r"\\msys\\[0-9.]+\\bin\\flex.exe$", conf.env.FLEX[0]):
+ # this is the flex shipped with MSYS
+ conf.env.FLEX_MSYS = True
+