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#!/usr/bin/env python
# encoding: utf-8
# John O'Meara, 2006
# Thomas Nagy 2009-2018 (ita)
"""
The **bison** program is a code generator which creates C or C++ files.
The generated files are compiled into object files.
"""
from waflib import Task
from waflib.TaskGen import extension
class bison(Task.Task):
"""Compiles bison files"""
color = 'BLUE'
run_str = '${BISON} ${BISONFLAGS} ${SRC[0].abspath()} -o ${TGT[0].name}'
ext_out = ['.h'] # just to make sure
@extension('.y', '.yc', '.yy')
def big_bison(self, node):
"""
Creates a bison task, which must be executed from the directory of the output file.
"""
has_h = '-d' in self.env.BISONFLAGS
outs = []
if node.name.endswith('.yc'):
outs.append(node.change_ext('.tab.cc'))
if has_h:
outs.append(node.change_ext('.tab.hh'))
else:
outs.append(node.change_ext('.tab.c'))
if has_h:
outs.append(node.change_ext('.tab.h'))
tsk = self.create_task('bison', node, outs)
tsk.cwd = node.parent.get_bld()
# and the c/cxx file must be compiled too
self.source.append(outs[0])
def configure(conf):
"""
Detects the *bison* program
"""
conf.find_program('bison', var='BISON')
conf.env.BISONFLAGS = ['-d']
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