Python pyparsing 模块，StringEnd() 实例源码
我们从Python开源项目中，提取了以下2个代码示例，用于说明如何使用pyparsing.StringEnd()。
def __init__(self, calc = SimpleCalculator()):
self.exprStack = []
def pushStack(s, l, t):
self.exprStack.append(t[0])
integer = Word(nums).addParseAction(pushStack)
addop = Literal('+') | Literal('-')
mulop = Literal('*') | Literal('/')
lpar = Literal('(')
rpar = Literal(')')
expr = Forward()
atom = integer | lpar + expr + rpar
term = atom + ZeroOrMore((mulop + atom).addParseAction(pushStack))
expr << term + ZeroOrMore((addop + term).addParseAction(pushStack))
self.expr = expr + StringEnd()
self.opfun = {
'+' : (lambda a, b: calc.add(a,b)),
'-' : (lambda a, b: calc.sub(a,
'*' : (lambda a, b: calc.mul(a,
'/' : (lambda a, b: calc.div(a,b)) }
def get_language():
"""Create or retrieve the parse tree for defining a sensor graph."""
global sensor_graph, statement
if sensor_graph is not None:
return sensor_graph
_create_primitives()
_create_simple_statements()
_create_block_bnf()
sensor_graph = ZeroOrMore(statement) + StringEnd()
sensor_graph.ignore(comment)
return sensor_graph
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