#!/usr/bin/env python # encoding: utf-8 # John O'Meara, 2006 # Thomas Nagy, 2006-2017 (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