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bison.py

#!/usr/bin/env python
# encoding: utf-8
# John O'Meara, 2006
# Thomas Nagy 2009

"Bison processing"

import Task
from TaskGen import extension

bison = '${BISON} ${BISONFLAGS} ${SRC[0].abspath()} -o ${TGT[0].name}'
cls = Task.simple_task_type('bison', bison, 'GREEN', ext_in='.yc .y .yy', ext_out='.c .cxx .h .l', before='cxx', shell=False)

@extension(['.y', '.yc', '.yy'])
def big_bison(self, node):
      """when it becomes complicated (unlike flex), the old recipes work better (cwd)"""
      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.bld_dir(tsk.env)

      # and the c/cxx file must be compiled too
      self.allnodes.append(outs[0])

def detect(conf):
      bison = conf.find_program('bison', var='BISON', mandatory=True)
      v = conf.env
      v['BISONFLAGS'] = '-d'


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