本文整理汇总了Python中pyparsing.Forward.enablePackrat方法的典型用法代码示例。如果您正苦于以下问题：Python Forward.enablePackrat方法的具体用法？Python Forward.enablePackrat怎么用？Python Forward.enablePackrat使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类pyparsing.Forward的用法示例。
在下文中一共展示了Forward.enablePackrat方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: Grammar
# 需要导入模块: from pyparsing import Forward [as 别名]
# 或者: from pyparsing.Forward import enablePackrat [as 别名]
def Grammar(home):
# Productions
cfoperator = equalsOp ^ notequalsOp
pathElement= seperator + identifier
RelSpec = OneOrMore(pathElement)
AbsSpec = identifier + RelSpec
ExprField = AbsSpec ^ RelSpec
ExprText = Forward()
BoolExpr = ExprField + cfoperator + ExprText
QueryExpr = BoolExpr + queryOp + ExprText + "/" +ExprText
ExprText << ( ExprField ^ \
QueryExpr ^ \
LiteralVal )
## Functions for parsing.
def doBool(s,loc,toks):
modlogger.debug( "getbol\n")
sense=(toks[1]=="!=")
return sense ^ ( str(toks[0]) == toks[2])
def doQuery(s,loc,toks):
modlogger.debug( "doing query\n")
if toks[0]:
return toks[2]
else:
return toks[4]
def ExprFieldAction(s,loc,toks):
#In this case our walk will fail so
# just return None as an invalid thang.
if home is None: return None
#Determine whether abs or rel and
# find our origin.
# We use the home objct - or
# derefernce the object if it is an absolute reference.
# - we can't just get the category because there is (currently)
# no object which represents those , but we can get an object
# and the grammar is specified such that an object must be spcified
# not just a category`
if toks[0] == ":":
origin = home
path = toks[1:]
else:
origin = home.get_root().get_object(toks[0],toks[2])
path = toks[4:]
#Walk along the attributes
field = origin
canonpath = origin.get_nodeid()
for ele in path:
if ele != ":": #Skip ':' as grammar noise.
if field is None:
raise NullReference(canonpath)
canonpath ="%s:%s"%(field.get_nodeid(),ele)
try:
field = field[ele]
except KeyError:
raise NoAttribute("%s has no attribute `%s'"%(field.get_nodeid(),ele))
if hasattr(field,"getSelf"):
field = field.getSelf()
return field
## Bind functions to parse actions
ExprField.setParseAction(ExprFieldAction)
BoolExpr.setParseAction(doBool)
QueryExpr.setParseAction(doQuery)
ExprText.enablePackrat()
ExprText.validate()
return ExprText + stringEnd示例2: Regex
# 需要导入模块: from pyparsing import Forward [as 别名]
# 或者: from pyparsing.Forward import enablePackrat [as 别名]
ID = ~MatchFirst([Keyword(w) for w in _keywords]) + Regex(r"[a-zA-Z_][a-zA-Z0-9_$]*")("id")
LP, RP, LB, RB, LC, RC, COLON, SEMICOLON, CAMMA, PERIOD, SHARP, EQUAL, AT, ASTA, Q, PLUS, MINUS, USC, APS = map(
Suppress, ("()[]{}:;,.#[email protected]*?+-_'")
)
DSLASH = Suppress(Literal("//"))
for k in _keywords:
setattr(this_mod, k.swapcase(), Keyword(k)("keyword"))
# setattr(sys.modules[__name__],k,Literal(k))
with open(_non_terminal_symbols_file, "r") as f:
for name in (line.strip() for line in f):
sym = Forward()(name)
sym.enablePackrat()
sym.ignore(cStyleComment)
# print("sym={0}".format(name))
setattr(this_mod, name, sym)
def alias(grammar, name):
if name:
return Group(grammar)(name)
else:
return Group(grammar)
class ErrorReportException(ParseException):
pass