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Java or Scala for FSM Parser?


By : vickyraj
Date : October 16 2020, 11:12 AM
Does that help I heartily recommend that you take a look at Scala--it's a great language, and well worth evaluating. But the problem that you have described is not, alone, a good reason to pick up a new language. If you learn Scala, it is very likely that implementing your FSM parser will be easier than in Java--but learning Scala plus implementing a simple FSM parser is probably not easier than just doing it in Java.
Also, it's not quite clear what you want in detail: do you want to index arrays by Enum value? You can typecast. Do you want arrays to hold Enums? That should just work. Do you want to interpret the inner array as an Enum? Write a wrapper function that creates an object that gives you a view that looks like what you want.
code :


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Is there a parser combinator as awesome as the Scala one for Java?


By : sayed shoaib
Date : March 29 2020, 07:55 AM
To fix the issue you can do JParsec seems to do the trick, but I cannot comment on its quality. Java has no operator overloading, which is the syntactic part of the "magic" in parser combinators.
You could also use Scala to implement parsers, then call them from Java. But then the benefit over a code generator such as JavaCC isn't as great.

Scala parser combinators vs ANTLR/Java generated parser?


By : user3074758
Date : March 29 2020, 07:55 AM
To fix this issue Scala's parser combinators aren't very efficient. They weren't designed to be. They're good for doing small tasks with relatively small inputs.
So it really depends on your requirements. There shouldn't be any interop problems with ANTLR. Calling Scala from Java can get hairy, but calling Java from Scala almost always just works.

Is there a java-only equivalent to scala's parser generators?


By : user3738993
Date : March 29 2020, 07:55 AM
To fix this issue I'm not sure about the lerning curve, but in the Java world, the ANTLR Parser Generator is very well regarded and considered among the best.

Reuse parser within another parser with Scala parser combinators


By : Siraj
Date : March 29 2020, 07:55 AM
will be helpful for those in need In order to reuse parsers, you need to use inheritance. So if you make FormulaParsers a class or a trait, ConditionParser can inherit from it and reuse its parsers.
This is also how you're already reusing the parsers defined in JavaTokenParsers.

Log4j unstructured log parser in Java or Scala


By : Zoe Loughton
Date : March 29 2020, 07:55 AM
should help you out Found a way by using log4j and extras 1.2 jars, although not work with Log4J 2.
Java
code :
import org.apache.log4j.Logger;
import org.apache.log4j.spi.LoggingEvent;
import org.apache.log4j.receivers.varia.LogFilePatternReceiver;

public class LogParser extends LogFilePatternReceiver {
    final static Logger logger = Logger.getLogger(LogParser.class);

    public void doPost(LoggingEvent event) {
        System.out.println(event.getTimeStamp());
        System.out.println(event.getMessage());
    }
    public static void main(String[] args) {
        (new LogParser()).run();
    }
    private void run(){
        LogFilePatternReceiver r = new LogParser();
        r.setLogFormat("TIMESTAMP LEVEL [THREAD] CLASS (FILE:LINE) - MESSAGE");
        r.setFileURL("file:///tmp/log");
        r.setTimestampFormat("yyyy-MM-dd HH:mm:ss,SSS");
        r.setTailing(true);
        r.setLoggerRepository(logger.getLoggerRepository());

        r.activateOptions();
    }
}
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">

<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
    <appender name="console" class="org.apache.log4j.ConsoleAppender">
        <param name="Target" value="System.out"/>
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%d %-5p [%t] %C{2} (%F:%L) - %m%n"/>
        </layout>
    </appender>
    <root>
        <priority value ="debug" />
        <appender-ref ref="console" />
    </root>
</log4j:configuration>
2017-12-02 16:53:42,618 DEBUG [main] LogParser (LogParser.java:15) - message 1
2017-12-02 16:53:42,624 DEBUG [main] LogParser (LogParser.java:16) - message 2
2017-12-02 19:21:31,633 INFO  [main] spi.Log4JULogger (Log4JULogger.java:104) - activateOptions
2017-12-02 19:21:31,652 DEBUG [LogFilePatternReceiver-plugin] spi.Log4JULogger (Log4JULogger.java:58) - regexp is (\S+-\S+-\S+ \S+:\S+:\S+,\S+)[ ]+(\S*\s*?)[ ]+\[(.*?)\][ ]+(.*?)[ ]+\((.*?):(.*?)\)[ ]+\-[ ]+(.*)
2017-12-02 19:21:31,652 INFO  [LogFilePatternReceiver-plugin] spi.Log4JULogger (Log4JULogger.java:104) - attempting to load file: file:///tmp/log

1512194022618
message 1
1512194022624
message 2

2017-12-02 19:21:33,656 DEBUG [LogFilePatternReceiver-plugin] spi.Log4JULogger (Log4JULogger.java:58) - tailing file
2017-12-02 19:21:35,660 DEBUG [LogFilePatternReceiver-plugin] spi.Log4JULogger (Log4JULogger.java:58) - tailing file
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