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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']
+