JFlex | Java version of Flex | Object-Relational Mapping library

 by   moy Java Version: v1.5+scala License: No License

kandi X-RAY | JFlex Summary

kandi X-RAY | JFlex Summary

JFlex is a Java library typically used in Utilities, Object-Relational Mapping, Hibernate applications. JFlex has no bugs, it has no vulnerabilities, it has build file available and it has low support. You can download it from GitHub.

Java version of Flex (OUTDATED mirror from SVN). Branch master is SVN's trunk. This is not the JFlex official repository.

            kandi-support Support

              JFlex has a low active ecosystem.
              It has 25 star(s) with 22 fork(s). There are 7 watchers for this library.
              It had no major release in the last 12 months.
              There are 1 open issues and 0 have been closed. On average issues are closed in 709 days. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of JFlex is v1.5+scala

            kandi-Quality Quality

              JFlex has no bugs reported.

            kandi-Security Security

              JFlex has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

            kandi-License License

              JFlex does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              Without a license, all rights are reserved, and you cannot use the library in your applications.

            kandi-Reuse Reuse

              JFlex releases are available to install and integrate.
              Build file is available. You can build the component from source.

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            JFlex Key Features

            No Key Features are available at this moment for JFlex.

            JFlex Examples and Code Snippets

            No Code Snippets are available at this moment for JFlex.

            Community Discussions


            Jflex and CUP not working on vscode and mac
            Asked 2022-Feb-22 at 18:16

            I downloaded jflex by doing brew install jflex everything worked the way it should.

            But now when I'm trying to make it work with java_cup.runtime.*. And I keep getting the errors below



            Answered 2022-Feb-22 at 18:16

            The fix for this issue is that if you use %cup in your jflex file you must then make your own sym class which contains public static final int EOF=0.

            Source https://stackoverflow.com/questions/71180011


            check if condition is met before executing the action in JFlex
            Asked 2021-Oct-17 at 11:06

            I am writing a lexical analyzer using JFlex. When the word co is matched, we have to ignore what comes after until the end of the line (because it's a comment). For the moment, I have a boolean variable that changes to true whenever this word is matched and if an identifier or an operator is matched after co until the end of the line, I simply ignore it because I have an if condition in my Identifier and Operator token identification.
            I am wondering if there is better way to do this and get rid of this if statement that appears everywhere?

            Here is the code:



            Answered 2021-Oct-17 at 11:06

            One way to do this is to use states in JFlex. We say that every time the word co is matched, we enter in a state named COMMENT_STATE and we do nothing until the end of the line. After the end of the line, we exit the COMMENT_STATE state. So here is the code:

            Source https://stackoverflow.com/questions/69603028


            JLEX lexical generator error: unterminated string at the end of the line
            Asked 2021-Jun-15 at 20:46

            I am generating lexical analyzer with JLEX. I found a regular expression for string literal from this link and used it in .jflex file same of other expressions. but it gives me this error : unterminated string at the end of the line
            StringLiteral = \"(\\.|[^"\\])*\"

            can anyone help me please, thanks.



            Answered 2021-Jun-15 at 20:46

            The regular expression you copied is for (f)lex, which uses a slightly different syntax for regular expressions. In particular, (f)lex treats " as an ordinary character inside bracketed classes, so [^"\\] is a character class matching anything other than (^) a quotation mark (") or a backslash (\\).

            However, in JFlex, the " is a quoting character, whether outside or inside brackets. So the " in the character class is unterminated. Hence the error message.

            So you need to backslash-escape it:

            Source https://stackoverflow.com/questions/67991038


            Cassandra with spark : java.io.IOException: Failed to open native connection to Cassandra at {} ::
            Asked 2021-May-25 at 23:23

            I have an application using Boot Strap running with cassandra 4.0, Cassandra java drive 4.11.1, spark 3.1.1 into ubuntu 20.4 with jdk 8_292 and python 3.6.

            When I run a function that it call CQL by spark, the tomcat gave me the error bellow.

            Stack trace:



            Answered 2021-May-25 at 23:23


            Explanation of JFlex Block Comment rule
            Asked 2021-May-23 at 20:49

            I was looking on how to implement block comments in JFlex for custom language support in intellij and found that it can be described as



            Answered 2021-May-23 at 20:49

            You've basically deciphered it correctly. Here's a few explanatory notes:

            [^]* matches an arbitrary sequence of characters. It's similar to .* except that . doesn't match newlines or unpaired surrogates; [^] matches absolutely anything.

            So ([^]* "*/" [^]*) matches any sequence which includes */. And therefore !([^]* "*/" [^]*) matches anything except a sequence containing */. In other words, it matches anything up to but not including */, which is the rest of the comment.

            Now what happens if the user makes a mistake and forgets to close the last comment? In that case, there is no */ and will match up to the end of input. Since there's no way to know where the comment should have ended (without being able to read the programmer's mind), the best we can do is to stop trying to parse. Thus, we accept the unterminated comment as a comment. That's why the final "*/"? is optional. It will match the comment terminator if there is one, and otherwise it will match an empty sequence at the end of the input.

            Source https://stackoverflow.com/questions/67661631


            JFlex maximum read length
            Asked 2021-May-17 at 03:53

            Given a positional language like the old IBM RPG, we can have a line such as



            Answered 2021-May-17 at 03:53

            Regular expression based lexical analysis is really not the right tool to parse fixed-field inputs. You can just split the input into fields at the known character positions, which is way easier and a lot faster. And it doesn't require fussing with regular expressions.

            Anyway, [a-zA-Z][a-zA-Z0-9]{0,14}[ ]{0,14} wouldn't be the right expression even if it did properly handle the token length, since the token is really the word at the beginning, without space characters.

            In the case of fixed-length fields which contain something more complicated than a single identifier, you might want to feed the field into a lexer, using a StringReader or some such.

            Although I'm sure it's not useful, here's a regular expression which matches 15 characters which start with a word and are completed with spaces:

            Source https://stackoverflow.com/questions/67558980


            Ambiguous Context-free grammar? / Shift/Reduce conflict in CUP
            Asked 2021-May-04 at 02:50

            I have the following context-free grammar for a simplified version of C++. When I run it with JFLEX and CUP I get a list of errors like that:



            Answered 2021-May-04 at 02:50

            CUP is a LALR parser generator, which means that there is no need to avoid left-recursion and so you can use a more natural grammatical style; there is no need to split lists into "start" and "continuation" productions, which are hard to read and error-prone, and furthermore often do not allow the direct construction of an accurate syntax tree.

            There are lots of conflicts in your grammar, but this one is clearly ambiguous:

            Source https://stackoverflow.com/questions/67377172


            Is there an alternative to \b and/or negative lookahead for JFLEX?
            Asked 2021-Apr-14 at 13:30

            I am building a Scanner and can't seem to find a way to identify operators like "if" or "else" using JFlex & Regex. Since JFlex doesn't fully conform I can't use word-boundary or (?<=\s|^) + (?=\s|$) because neither ? or $ are allowed. The idea is to find the correctly written operators not ifo or elso. Thanks in advance.



            Answered 2021-Apr-14 at 13:30

            The idea is to find the correctly written operators not ifo or elso. Thanks in advance.

            Just use "if" and "else" and have another pattern that would match ifo and elseo (like for identifiers) and that comes after the patterns for if and else:

            Source https://stackoverflow.com/questions/67083803


            Jflex get input filename
            Asked 2021-Apr-08 at 22:08

            In Jflex, how does one extract the input filename?




            Answered 2021-Apr-08 at 22:08

            This can be achieved by omitting the %standalone tag at the top of the jflex file. This makes jflex not generate the default main() method and allows the user to set their own custom main() method inside of a %{ %} code segment.

            Within this main(), the user can place the original code for the autogenerated main(), but can update to the desired outcome.

            Within this context:

            Source https://stackoverflow.com/questions/66934058


            Using Ubuntu's subsystem on Windows for 'make' gives java error
            Asked 2021-Feb-11 at 10:54

            I am trying to execute Makefile as part of my course. It's a parser and lexer in CUP and Jflex, respectively. It is not possible to do it in Windows Powershell, so I was advised to use Linux, my colleague was also able to run it on Ubuntu's subsystem on Windows.

            So I downloaded the ubuntu:

            https://www.microsoft.com/en-us/p/ubuntu/9nblggh4msv6?activetab=pivot:overviewtab from MS Store

            Then allowed to use Linux subsystem in the Windows settings, however now, when I try to run make in bash, I get this error:



            Answered 2021-Feb-11 at 10:54

            You can run all the Windows 10 executables including Java from within WSL, but note that GNU/Linux won't tack on ".EXE" by default as Windows does (Windows uses PATHEXT=.COM;.EXE;.BAT ... for this purpose), and WSL won't necessarily have the Windows binaries on the bash PATH.

            For example my installation of JDK14 is at Windows C:\java\jdk-14 == WSL /mnt/c/java/jdk-14:

            Source https://stackoverflow.com/questions/66144893

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install JFlex

            You can download it from GitHub.
            You can use JFlex like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the JFlex component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .


            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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