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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
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