Encoding XPath Expressions with both single and do

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's Pizza"]
//review[@name='"Pizza" Pam']

But if you have BOTH e.g [Fred's "Fancy Pizza"] then you have to use something like this Escaping Strings in XPath (C++) to generate

//review[@name=Concat("Fred's ",'"Fancy Pizza"')]

Anyone have a function in c# to do this?

Some links that are close

• Use the MVP.XML library and XPathVariable (a very good solution but a bit heavyweight for my needs).
• Doesn't encode where both " and ' are present
• Adds more arguments to the Concat operation than is necessary e.g. would return //review[@name=concat('Fred', "'", 's ', '"', 'Fancy Pizza', '"', '')]

EDIT: A few answers have suggested escaping ' with ' and " with " but although this makes sense it does not work; try it using the XML fragment:

<review name="Bob's Pizza"/>

and the xpath

//review[@name='Bob's Pizza']

Answer 1

I needed to do this in XSLT itself, so came up with the following based on the answers on this page:

<xsl:template name="escape-string">
  <xsl:param name="string"/>
  <xsl:param name="concat" select="true()"/>
  <xsl:variable name="quote">"</xsl:variable>
  <xsl:variable name="apos">'</xsl:variable>
  <xsl:choose>
    <xsl:when test="not(contains($string, $apos))">'<xsl:value-of select="$string"/>'</xsl:when>
    <xsl:when test="not(contains($string, $quote))">"<xsl:value-of select="$string"/>"</xsl:when>
    <xsl:otherwise>
      <xsl:if test="$concat">concat(</xsl:if>
      <xsl:call-template name="escape-string">
        <xsl:with-param name="string" select="substring-before($string, $apos)"/>
        <xsl:with-param name="concat" select="false()"/>
      </xsl:call-template>
      <xsl:text>, "'", </xsl:text>
      <xsl:call-template name="escape-string">
        <xsl:with-param name="string" select="substring-after($string, $apos)"/>
        <xsl:with-param name="concat" select="false()"/>
      </xsl:call-template>
      <xsl:if test="$concat">)</xsl:if>
    </xsl:otherwise>
  </xsl:choose>
</xsl:template>

Answer 2

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

Answer 3

This is what I've come up with

public static string EncaseXpathString(string input)
{         
    // If we don't have any " then encase string in "
    if (!input.Contains("\""))
        return String.Format("\"{0}\"", input);

    // If we have some " but no ' then encase in '
    if (!input.Contains("'"))
        return String.Format("'{0}'", input);

    // If we get here we have both " and ' in the string so must use Concat
    StringBuilder sb = new StringBuilder("concat(");           

    // Going to look for " as they are LESS likely than ' in our data so will minimise
    // number of arguments to concat.
    int lastPos = 0;
    int nextPos = input.IndexOf("\"");
    while (nextPos != -1)
    {
        // If this is not the first time through the loop then seperate arguments with ,
        if (lastPos != 0)
            sb.Append(",");

        sb.AppendFormat("\"{0}\",'\"'", input.Substring(lastPos, nextPos - lastPos));
        lastPos = ++nextPos;

        // Find next occurance
        nextPos = input.IndexOf("\"", lastPos);
    }

    sb.Append(")");
    return sb.ToString();
}

Called using something like

XmlNode node = doc.SelectSingleNode("//review[@name=" + EncaseXpathString("Fred's \"Fancy Pizza\"" + "]")

So we get the following results

EncaseXpathString("Pizza Shed") == "'Pizza Shed'";
EncaseXpathString("Bob's pizza") == "\"Bob's Pizza\"";
EncaseXpathString("\"Pizza\" Pam" == "'\"Pizza\" Pam'";
EncaseXpathString("Fred's \"Fancy Pizza\"") == "concat(\"Fred's \",'\"',\"Fancy Pizza\",'\"')";

So it's only using concat when its necessary (both " and ' in string)

The last result show the concat operation is not as short as it could be (see question) but its close enough and anything more optimal would be very complex as you would have to look for matching pairs of " or '.

Answer 4

I've had problems with all solutions so far. One has extra text sections (e.g. '"' or "'") which breaks what you're looking for. One drops all text after the last quote/dblquote which breaks as well.

This is a dumb and quick solution from a dumb vb developer:

Function ParseXpathString(ByVal input As String) As String
    input = Replace(input, "'", Chr(1))
    input = Replace(input, """", Chr(2))
    input = Replace(input, Chr(1), "',""'"",'")
    input = Replace(input, Chr(2), "','""','")
    input = "concat('','" + input + "')"
    Return input
End Function

Usage (same as previous examples):

x.SelectNodes("/path[@attr=" & ParseXpathString(attrvalue) & "]")

Answer 5

I was in need of this so I created this solution, for C#.

    /// <summary>
    /// Returns a valid XPath statement to use for searching attribute values regardless of 's or "s
    /// </summary>
    /// <param name="attributeValue">Attribute value to parse</param>
    /// <returns>Parsed attribute value in concat() if needed</returns>
    public static string GetXpathStringForAttributeValue(string attributeValue)
    {
        bool hasApos = attributeValue.Contains("'");
        bool hasQuote = attributeValue.Contains("\"");

        if (!hasApos)
        {
            return "'" + attributeValue + "'";
        }
        if (!hasQuote)
        {
            return "\"" + attributeValue + "\"";
        }

        StringBuilder result = new StringBuilder("concat(");
        StringBuilder currentArgument = new StringBuilder();
        for (int pos = 0; pos < attributeValue.Length; pos++)
        {
            switch (attributeValue[pos])
            {
                case '\'':
                    result.Append('\"');
                    result.Append(currentArgument.ToString());
                    result.Append("'\",");
                    currentArgument.Length = 0;
                    break;
                case '\"':
                    result.Append('\'');
                    result.Append(currentArgument.ToString());
                    result.Append("\"\',");
                    currentArgument.Length = 0;
                    break;
                default:
                    currentArgument.Append(attributeValue[pos]);
                    break;
            }
        }
        if (currentArgument.Length == 0)
        {
            result[result.Length - 1] = ')';
        }
        else
        {
            result.Append("'");
            result.Append(currentArgument.ToString());
            result.Append("')");
        }
        return result.ToString();
    }

Answer 6

Another variation...my concat() part is a little lazy, but at least it uses the whole value.

    /// <summary>
    /// Returns an XPath string literal to use for searching attribute values (wraped in apostrophes, quotes, or as a concat function).
    /// </summary>
    /// <param name="attributeValue">Attribute value to encode and wrap.</param>
    public static string CreateXpathLiteral(string attributeValue)
    {
        if (!attributeValue.Contains("\""))
        {
            // if we don't have any quotes, then wrap string in quotes...
            return string.Format("\"{0}\"", attributeValue);
        }
        else if (!attributeValue.Contains("'"))
        {
            // if we have some quotes, but no apostrophes, then wrap in apostrophes...
            return string.Format("'{0}'", attributeValue);
        }
        else
        {
            // must use concat so the literal in the XPath will find a match...
            return string.Format("concat(\"{0}\")", attributeValue.Replace("\"", "\",'\"',\""));
        }
    }