本文整理匯總了Python中pyparsing.operatorPrecedence方法的典型用法代碼示例。如果您正苦於以下問題：Python pyparsing.operatorPrecedence方法的具體用法？Python pyparsing.operatorPrecedence怎麽用？Python pyparsing.operatorPrecedence使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類pyparsing的用法示例。
在下文中一共展示了pyparsing.operatorPrecedence方法的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Python代碼示例。
示例1: _def_parser
# 需要導入模塊: import pyparsing [as 別名]
# 或者: from pyparsing import operatorPrecedence [as 別名]
def _def_parser():
# Enabling packrat parsing greatly speeds up the parsing.
pyparsing.ParserElement.enablePackrat()
alphas = pyparsing.alphas
Combine = pyparsing.Combine
Forward = pyparsing.Forward
nums = pyparsing.nums
oneOf = pyparsing.oneOf
opAssoc = pyparsing.opAssoc
operatorPrecedence = pyparsing.operatorPrecedence
Word = pyparsing.Word
integer = Word(nums)
real = Combine(Word(nums) + '.' + Word(nums))
variable = Word(alphas + '_' + '.')
number = real | integer
expr = Forward()
fn = Word(alphas + '_' + '.')
operand = number | variable | fn
signop = oneOf('+ -')
addop = oneOf('+ -')
multop = oneOf('* /')
comparisonop = oneOf(' '.join(EvalComparisonOp.operations.keys()))
ternaryop = ('?', ':')
boolandop = oneOf('AND and &&')
boolorop = oneOf('OR or ||')
negateop = oneOf('NOT not !')
operand.setParseAction(EvalConstant)
expr = operatorPrecedence(operand, [
(fn, 1, opAssoc.RIGHT, EvalFunction),
("^", 2, opAssoc.RIGHT, EvalPowerOp),
(signop, 1, opAssoc.RIGHT, EvalSignOp),
(multop, 2, opAssoc.LEFT, EvalMultOp),
(addop, 2, opAssoc.LEFT, EvalAddOp),
(negateop, 1, opAssoc.RIGHT, EvalNegateOp),
(comparisonop, 2, opAssoc.LEFT, EvalComparisonOp),
(ternaryop, 3, opAssoc.LEFT, EvalTernaryOp),
(boolandop, 2, opAssoc.LEFT, EvalBoolAndOp),
(boolorop, 2, opAssoc.LEFT, EvalBoolOrOp),
(',', 2, opAssoc.RIGHT, EvalCommaSeperator), ])
return expr