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POTransform Javascript XPath in valid PHP query() XPath | normalize JS XPath --> PHP
 

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    <p>This is valid XPath in Javascript:</p> <pre><code>id("priceInfo")/div[@class="standardProdPricingGroup"]/span[1] </code></pre> <p>And this turned into valid PHP XPath to be used with DOMXPath->query() is</p> <pre><code>//*[@id="priceInfo"]//div[@class="standardProdPricingGroup"]//span[1] </code></pre> <ol> <li>do you know any libraries or custom components that already do this transformation? </li> <li>do you know available documentation that lists the two syntax differences?</li> </ol> <p>My main concern is that there could be a lot of differences, and I am looking to identify these differences, and I have problems to identify these. </p> <p>The question could be put also in different way: <strong>Since Javascript can have different valid XPath formats, how to normalize them to work with the PHP.</strong></p> <p>One of the updates also mention that the id() function is valid XPath if there is a valid DTD that contains this definition. I don't have power over the input DTD, and if there is a way to find a solution that works without any specific DTD it would be awesome.</p> <p><strong>Update:</strong></p> <p>I want to transform the first format into the second with an algorithm. My input is the first one and not the second one. Can't change this.</p> <p>As @Nison Maël pointed out, the 2nd format is valid Javascript XPath as presented here: <a href="http://jsbin.com/elatum/2/edit">http://jsbin.com/elatum/2/edit</a> this unfortunately just adds to the problem of Javascript XPath "fragmentation".</p> <p>@salathe pointed out that the valid Javascript XPath query works fine in PHP if the input documented has valid DTD ( @Dimitre Novatchev mentioned this in a comment, but overlooked the importance). Unfortunately I don't have control of the input DTD, so now I have to investigate a way to overcome this, or to find a solution that works even without valid DTD.</p>
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    1. COThis is a great question! It doesn't look like there's any documentation out there (at least not through a cursory google search). I'm excited to see the answer to this one.
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    2. COThe first expression is a legal XPath expression. However, for the Xpath function `id()` to work, the XML must have a DTD and element definitions in the DTD must have attributes thet have the `ID` keyword.
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    3. CO@DimitreNovatchev: And what about the translation of `//` to `/`?
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