文本生成算法

Question

我正在寻找一个算法或一些建议来实现它。
输入：

"{1|2} word {3|4}"

输出：

^{pr2}$

另外，我想支持嵌套结构-"{1|2{0|1}}" -> ["1", "20", "21"]
我意识到这个问题太笼统了，但不想实现方向盘。也许你也看到过类似的事情。在

升级版

from pyparsing import *
from collections import deque

s = u"{1|2} {3|4}"

deque = deque()

def mesh_lists(listOne, listTwo):
    result = []
    for l1 in listOne:
        for l2 in listTwo:
            firstWord = str(l1).strip()
            secondWord = str(l2).strip()
            result.append(" " + firstWord + " " + l2 + " ")
    return result

def action(string, pos, token):
    global deque
    deque.append(list(token[0]))

def processDeque():
    global deque
    while len(deque) > 1:
        l1 = deque.popleft()
        l2 = deque.popleft()
        res = mesh_lists(l1,l2)
        deque.appendleft(res)
    return [x.strip() for x in deque[0]]

_lcurl = Suppress('{')
_rcurl = Suppress('}')
_pipe = Suppress('|')
word = Regex("[^{|}]+")
varBlock = Forward()
entry = word | varBlock
varList = Group(entry + ZeroOrMore(_pipe + entry))
varBlock << (_lcurl + Optional(varList) + _rcurl).setParseAction(action)
template = ZeroOrMore(entry)

res = template.parseString(s)
print processDeque()

它只支持“{| |}{|}”构造。没有空话，没有嵌套结构。在

Answer 1

pyparsing发布的示例包括一个regex反相器。在

Answer 2

这个项目看起来很适合你：https://github.com/asciimoo/exrex

Exrex is a tool that generates all matching strings to a given regular expression.