本文整理汇总了Python中pyparsing.operatorPrecedence方法的典型用法代码示例。如果您正苦于以下问题：Python pyparsing.operatorPrecedence方法的具体用法？Python pyparsing.operatorPrecedence怎么用？Python pyparsing.operatorPrecedence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的用法示例。
在下文中一共展示了pyparsing.operatorPrecedence方法的1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: _def_parser
# 需要导入模块: import pyparsing [as 别名]
# 或者: from pyparsing import operatorPrecedence [as 别名]
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