替换单引号，但如果在双引号内使用 JSON.parse()

Question

我需要一个解决方案来仅交换单引号对，它们不在双引号对中[=16] =]

一个简化的例子（原件 > 100 KB）：

['Element1',"Element's2",{"Element3":"E3"},'Element4']

在此示例中 Element's2 不应变为 Element"s2，但 'Element1' 应该变成"Element1".

背景：我需要提取大 Javascript 块中包含的一些网站数据。要得到它，我需要 JOSN.parse() 不接受单引号 (') 作为引号。

但我不能简单地使用 replace(/'/g, '"')，因为单引号在某些文本中也用作撇号，例如："that's it".

顺便说一句：随着@hakre 的重新开始，我的案例 的一个更简单的解决方案是使用eval() 而不是JOSN.parse()。使用 eval() 无需交换单引号。

Answer 1

我已经构建了这个脚本来解决我的问题。即使被否决，这个也适用于我的情况并且速度更快。

function convert(input) {

    const singleQuote = "'"
    const doubleQuote = '"'
    const replaceBy = '"'
    var firstSingleQuote = null
    var firstDoubleQuote = null
    var pairCount = 0
    var data = Array.from(input)

    function replacePair(data, newChar, firstPos, secondPos) {
        data[firstPos] =  newChar;
        data[secondPos] =  newChar;
        pairCount++
    }

    function checkQuotes(data,pos){
        if (data[pos] == singleQuote) {
          if (firstSingleQuote == null && firstDoubleQuote == null) { firstSingleQuote = pos; return; }
          if (firstSingleQuote != null && firstDoubleQuote == null) { replacePair(data,replaceBy,firstSingleQuote,pos); firstSingleQuote = null; return; }
          if (firstSingleQuote == null && firstDoubleQuote != null) { return; }
          if (firstSingleQuote != null && firstDoubleQuote != null) { return; }
        }

        if (data[pos] == doubleQuote) {
          if (firstDoubleQuote == null && firstSingleQuote == null) { firstDoubleQuote = pos; return; }
          if (firstDoubleQuote != null && firstSingleQuote == null) { firstDoubleQuote = null; return; }  // todo: replace doubleQuote if wanted!!
          if (firstDoubleQuote == null && firstSingleQuote != null) { return; }
          if (firstDoubleQuote != null && firstSingleQuote != null) { return; }
        }
    }

    for (let i=0; i < data.length; i++) {
      checkQuotes(data,i)
    }

    var result = data.join("");
    console.log(pairCount , "Pairs of Single Quotes exchanged")
    return result
}

document.getElementById('start').addEventListener('click', () => {
    var dataIn = document.getElementById('input').value;
    var output = document.getElementById('output').value = convert(dataIn)
});

<html><body>
<button id="start">start</button><BR>

Input:<br><textarea id="input" name="w3review" rows="2" cols="100" spellcheck="false">
['Element1',"Element's2",{"Element3":"E3"},'Element4']
</textarea><BR>

Output:<br><textarea id="output" name="w3review" rows="2" cols="100" spellcheck="false"></textarea>
 
</body></html>

Answer 2

我制作了第二个变体，它也关心转义引号，例如：[\'Element1\',"Element's2",{"Elements3":"E3"},'Element\'s4']

但是速度有点慢而且代码看起来有点复杂（所以我使用了另一个变体）：

function convert(input) {

    var openQuote 
    var close = {symbol:null,level:0,firstPos:null}
    openQuote = close;
    const singleQuote = "'"
    const doubleQuote = '"'
    const replaceBy = '"'
    var pairCount = 0
    var data = Array.from(input)

    function replacePair(data, newChar, firstPos, secondPos) {
        data[firstPos] =  newChar;
        data[secondPos] =  newChar;
        pairCount++
    }

    function checkEscaped (data, pos, level = 0) {
        if (pos <= 0) return level
        if (data[pos-1] ==  "\")  { return checkEscaped(data,pos-1,level+1) }
        return level
    }

    function checkQuotes(data,pos){

        if (data[pos] == singleQuote) {
        let level = checkEscaped(data, pos)

          if (openQuote.symbol == null) {openQuote = {symbol: singleQuote, level: level, firstPos: pos}; return}
          if (openQuote.symbol == singleQuote && openQuote.level == level) {replacePair(data,replaceBy,openQuote.firstPos,pos); openQuote = close; return;}
          return
        }

        if (data[pos] == doubleQuote) {
        let level = checkEscaped(data, pos)

          if (openQuote.symbol == null) {openQuote = {symbol: doubleQuote, level: level, firstPos: pos}; return}
          if (openQuote.symbol == doubleQuote && openQuote.level == level) {openQuote = close; return;}
        }
    }

    for (let i=0; i < data.length; i++) {
      checkQuotes(data,i)
    }

    var result = data.join("");
    console.log(pairCount , "Pairs of Single Quotes exchanged")
    return result
}

document.getElementById('start').addEventListener('click', () => {
    var dataIn = document.getElementById('input').value;
    var output = document.getElementById('output').value = convert(dataIn)
});

<html><body>
<button id="start">start</button><BR>

Input:<br><textarea id="input" name="w3review" rows="2" cols="100" spellcheck="false">
[\'Element1\',"Element's2",{"Elements3":"E3"},'Element\'s4']
</textarea><BR>

Output:<br><textarea id="output" name="w3review" rows="2" cols="100" spellcheck="false"></textarea>
 
</body></html>

替换单引号，但如果在双引号内使用 JSON.parse()

Replace single quotes, but not if within double quotes to use JSON.parse()

javascript

parsing

json

data-extraction