Encoding XPath Expressions with both single and double quotes

Question

XPath (v1) contains no way to encode expressions.

If you only have single OR double quotes then you can use expressions such as

//review[@name=\"Bob         


        

Answer 1

Join in the fun

public string XPathLiteral(string text) {

    const string APOS = "'";
    const string QUOTE = @"""";

    int pos = 0;

    int posApos;
    int posQuote;

    posQuote = text.IndexOf(QUOTE, pos);

    if (posQuote < 0) {
        return QUOTE + text + QUOTE;
    }//if

    posApos = text.IndexOf(APOS, pos);

    if (posApos < 0) {
        return APOS + text + APOS;
    }//if

    bool containsApos = posApos < posQuote;

    StringBuilder sb = new StringBuilder("concat(", text.Length * 2);

    bool loop = true;
    bool comma = false;

    while (loop) {

        if (posApos < 0) {
            posApos = text.Length;
            loop = false;
        }//if

        if (posQuote < 0) {
            posQuote = text.Length;
            loop = false;
        }//if

        if (comma) {
            sb.Append(",");
        } else {
            comma = true;
        }//if

        if (containsApos) {
            sb.Append(QUOTE);
            sb.Append(text.Substring(pos, posQuote - pos));
            sb.Append(QUOTE);
            pos = posQuote;
            if (loop) posApos = text.IndexOf(APOS, pos + 1);
        } else {
            sb.Append(APOS);
            sb.Append(text.Substring(pos, posApos - pos));
            sb.Append(APOS);
            pos = posApos;
            if (loop) posQuote = text.IndexOf(QUOTE, pos + 1);
        }//if

        // Toggle
        containsApos = !containsApos;

    }//while

    sb.Append(")");

    return sb.ToString();

}//method