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POFiltering Java comments using StreamTokenizer
 

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  1. POFiltering Java comments using StreamTokenizer
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    <p>My goal is to analyze java source files to find line numbers containing non-comment code. Since StreamTokenizer has slashStarComments() and slashSlashComments(), I figured I'll use it to filter out the lines that have only comments and no code.</p> <p>The program below prints the line numbers and any string tokens on that line, for each line that has something that's not a comment. </p> <p>It works <strong>most</strong> of the time, but sometimes not... For example, line numbers get skipped every now and then begining with the comment line 144 in the following source file from log4j, Category.java: <a href="http://logging.apache.org/log4j/1.2/xref/org/apache/log4j/Category.html" rel="nofollow noreferrer">http://logging.apache.org/log4j/1.2/xref/org/apache/log4j/Category.html</a> StreamTokenizer sometimes just seem to skip some lines at the end of javadoc comments.</p> <p>Here's my code:</p> <pre> import java.io.FileReader; import java.io.IOException; import java.io.Reader; import java.io.StreamTokenizer; public class LinesWithCodeFinder { public static void main(String[] args) throws IOException { String filePath = args[0]; Reader reader = new FileReader(filePath); StreamTokenizer tokenizer = new StreamTokenizer(reader); tokenizer.slashStarComments(true); tokenizer.slashSlashComments(true); tokenizer.eolIsSignificant(false); int ttype = 0; int lastline = -1; String s = ""; while (ttype != StreamTokenizer.TT_EOF) { ttype = tokenizer.nextToken(); int lineno = tokenizer.lineno(); String sval = ttype == StreamTokenizer.TT_WORD ? tokenizer.sval : ""; if (lineno == lastline) { s += " " + sval; } else { if (lastline != -1) System.out.println(lastline + "\t" + s); s = sval; } lastline = lineno; } } } </pre> <ol> <li><p>Does anyone understand why StreamTokenizer behaves as it does?</p></li> <li><p>Any alternative ideas on how to filter out the comments would be appreciated.</p></li> </ol>
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