3 Tool-specific initialization for yacc.
5 There normally shouldn't be any need to import this module directly.
6 It will usually be imported through the generic SCons.Tool.Tool()
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34 __revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
42 YaccAction = SCons.Action.Action("$YACCCOM", "$YACCCOMSTR")
44 def _yaccEmitter(target, source, env, ysuf, hsuf):
45 # If -d is specified on the command line, yacc will emit a .h
46 # or .hpp file as well as a .c or .cpp file, depending on whether
47 # the input file is a .y or .yy, respectively.
48 if len(source) and '-d' in SCons.Util.CLVar(env.subst("$YACCFLAGS")):
49 base, ext = os.path.splitext(SCons.Util.to_String(source[0]))
51 base, ext = os.path.splitext(SCons.Util.to_String(target[0]))
52 target.append(base + hsuf)
53 return (target, source)
55 def yEmitter(target, source, env):
56 return _yaccEmitter(target, source, env, '.y', '.h')
58 def yyEmitter(target, source, env):
59 return _yaccEmitter(target, source, env, '.yy', '.hpp')
62 """Add Builders and construction variables for yacc to an Environment."""
63 c_file, cxx_file = SCons.Tool.createCFileBuilders(env)
65 c_file.add_action('.y', YaccAction)
66 c_file.add_action('.yacc', YaccAction)
67 cxx_file.add_action('.yy', YaccAction)
68 c_file.add_emitter('.y', yEmitter)
69 c_file.add_emitter('.yacc', yEmitter)
70 cxx_file.add_emitter('.yy', yyEmitter)
72 env['YACC'] = env.Detect('bison') or 'yacc'
73 env['YACCFLAGS'] = SCons.Util.CLVar('')
74 env['YACCCOM'] = '$YACC $YACCFLAGS -o $TARGET $SOURCES'
77 return env.Detect(['bison', 'yacc'])