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POHow to replace StringTokenzier(..., true) in GWT?
 

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  1. POHow to replace StringTokenzier(..., true) in GWT?
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    <p>I am looking for a GWT compatible replacement for a StringTokenzier which includes the delimiter. The task cannot be solved by regular expressions because the grammar is not context free.</p> <p>Example: Extract the first level of a generic type definition. So for <code>List&lt;String&gt;, Map&lt;Integer, Map&lt;Character, Boolean&gt;&gt;, Set&lt;List&lt;Double&gt;&gt;</code>, I want a list with three items. <code>List&lt;String&gt;</code> and <code>Map&lt;Integer, Map&lt;Character, Boolean&gt;&gt;</code> and <code>Set&lt;List&lt;Double&gt;&gt;</code></p> <p>Stripped down example code:</p> <pre><code>private static List&lt;String&gt; extractFirstLevel(String type) { List&lt;String&gt; res = new LinkedList&lt;String&gt;(); StringTokenizer st = new StringTokenizer(type, "&lt;&gt;,", true); int nesting = 0; // we are only interested in nesting 0 String lastToken = ""; while (st.hasMoreTokens()) { String token = st.nextToken(); if (token.equals("&lt;")) { nesting++; // ignore till matching &gt;, but keep track of additional &lt; lastToken = lastToken + "&lt;"; } else if (token.equals("&gt;")) { nesting--; // up one level lastToken = lastToken + "&gt;"; } else if (token.equals(",")) { if (nesting == 0) { // we are interested in the top level res.add(lastToken); lastToken = ""; } else { // this is a , inside a &lt; &gt;, so we are not interested lastToken = lastToken + ", "; } } else { lastToken = lastToken + token.trim(); } } res.add(lastToken); return res; } </code></pre>
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    1. USWassersturm
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    1. COYou could use String.split() method. Usually that is a very good alternative for StringTokenizer but I don't know about the part where you get the tokenizer to return the delimiters.
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      1. USgeorge_h
    2. COI don't think split() will get me anywhere because it is designed for regular expressions only.
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      1. USWassersturm
    3. COTrue, though I meant you can split by using "<>," as your regex. It will work, but in your tokenizer you want it to return the delimiters right? if that is 100% needed then your stuck with StringTokenizer and no alternative exists (that I know of).
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      1. USgeorge_h
 

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