ANTLR is a powerful parser generator for reading, processing, executing, or translating structured text or binary files.

Last update: Dec 18, 2022

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Overview

ANTLR v4

ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files. It's widely used to build languages, tools, and frameworks. From a grammar, ANTLR generates a parser that can build parse trees and also generates a listener interface (or visitor) that makes it easy to respond to the recognition of phrases of interest.

This is a fork

This is the "optimized" fork of ANTLR 4, which contains many features and optimizations not present in the reference release. For information about these features, see doc/optimized-fork.md.

Build Status

Authors and major contributors

Terence Parr, [email protected] ANTLR project lead and supreme dictator for life University of San Francisco
Sam Harwell (Tool co-author, lead developer for the optimized fork along with the optimized Java, C#, and TypeScript targets)
Burt Harris (Co-author of the optimized TypeScript target)
Ben Hamilton (Full Unicode support)

Useful information

The Definitive ANTLR 4 Reference

Programmers run into parsing problems all the time. Whether it’s a data format like JSON, a network protocol like SMTP, a server configuration file for Apache, a PostScript/PDF file, or a simple spreadsheet macro language—ANTLR v4 and this book will demystify the process. ANTLR v4 has been rewritten from scratch to make it easier than ever to build parsers and the language applications built on top. This completely rewritten new edition of the bestselling Definitive ANTLR Reference shows you how to take advantage of these new features.

You can buy the book The Definitive ANTLR 4 Reference at amazon or an electronic version at the publisher's site.

You will find the Book source code useful.

Additional grammars

This repository is a collection of grammars without actions where the root directory name is the all-lowercase name of the language parsed by the grammar. For example, java, cpp, csharp, c, etc...

Comments

Fix antlr/antlr4#1890 Standalone CR should be recognized as line separator

Hello!

I've made changes to treat stand-alone CR as line separator. This changes were tested on millions of LOC with-out any noticable perfomance regress. Also I use my fork to parse files everyday as a part of static analysis process.

P.S. Link to my PR to original ANTLR4 repo opened half an year ago...

opened by nixel2007 11
Unexpected parsing result in left recursive rule
Hi @sharwell ,

expression : { SemanticPredicates.isTypeCast(_input) }? castParExpression expression #castExprAlt

( the relevant workaround: https://github.com/danielsun1106/groovy-parser/blob/bbf0d3abaa2cf8cfdde3a8a3588bf39df2989083/src/main/antlr/GroovyParser.g4#L779-L788 )

If the above semantic predicate fails, antlr4 will not choose other alternatives of expression, so we have to extract castExpression rule. In addition, even if we can workaround the semantic predicate issue, we found the priority of expression is not correct either, e.g. (Integer) m() instanceof Integer should be parsed as ((Integer) m()) instanceof Integer, but is parsed as (Integer) (m() instanceof Integer) currently. As you can see, we put the castExpression at the first place so we thought it should have higher priority than instanceof expression.

Please have a look into the issue. Thanks in advance.

Cheers, Daniel.Sun
bug
opened by daniellansun 7
Question: what is the difference between this project and antlr/antlr4

This project seems an old snapshot of https://github.com/antlr/antlr4, giving another artifact id with the same package name with https://github.com/antlr/antlr4.

However, @sharwell merged a pull-request (#2) in this project. Why? Does this project live?
question

opened by gfx 6
Bump junit from 4.11 to 4.13.1 in /antlr4-maven-plugin/src/test/projects/dependencyRemoved
Bumps junit from 4.11 to 4.13.1.

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1b683f4 [maven-release-plugin] prepare release r4.13.1

ce6ce3a Draft 4.13.1 release notes

c29dd82 Change version to 4.13.1-SNAPSHOT

1d17486 Add a link to assertThrows in exception testing

543905d Use separate line for annotation in Javadoc

510e906 Add sub headlines to class Javadoc

610155b Merge pull request from GHSA-269g-pwp5-87pp

b6cfd1e Explicitly wrap float parameter for consistency (#1671)

a5d205c Fix GitHub link in FAQ (#1672)

3a5c6b4 Deprecated since jdk9 replacing constructor instance of Double and Float (#1660)

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dependencies
opened by dependabot[bot] 5
Bump junit from 4.11 to 4.13.1 in /antlr4-testgen-maven-plugin
Bumps junit from 4.11 to 4.13.1.

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1b683f4 [maven-release-plugin] prepare release r4.13.1

ce6ce3a Draft 4.13.1 release notes

c29dd82 Change version to 4.13.1-SNAPSHOT

1d17486 Add a link to assertThrows in exception testing

543905d Use separate line for annotation in Javadoc

510e906 Add sub headlines to class Javadoc

610155b Merge pull request from GHSA-269g-pwp5-87pp

b6cfd1e Explicitly wrap float parameter for consistency (#1671)

a5d205c Fix GitHub link in FAQ (#1672)

3a5c6b4 Deprecated since jdk9 replacing constructor instance of Double and Float (#1660)

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dependencies
opened by dependabot[bot] 5
Bump junit from 4.12 to 4.13.1 in /antlr4-maven-plugin
Bumps junit from 4.12 to 4.13.1.

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Commits

1b683f4 [maven-release-plugin] prepare release r4.13.1

ce6ce3a Draft 4.13.1 release notes

c29dd82 Change version to 4.13.1-SNAPSHOT

1d17486 Add a link to assertThrows in exception testing

543905d Use separate line for annotation in Javadoc

510e906 Add sub headlines to class Javadoc

610155b Merge pull request from GHSA-269g-pwp5-87pp

b6cfd1e Explicitly wrap float parameter for consistency (#1671)

a5d205c Fix GitHub link in FAQ (#1672)

3a5c6b4 Deprecated since jdk9 replacing constructor instance of Double and Float (#1660)

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dependencies
opened by dependabot[bot] 4
Improve the performance of failed semantic predicate
Background

When semantic predicate fails, FailedPredicateException will be thrown to change the control flow. But as we all know, filling the stack trace is expensive especially when FailedPredicateException is thrown frequently.

Proposal

I propose to override fillInStackTrace() of FailedPredicateException, and its implementation is simplified as follows:

public synchronized Throwable fillInStackTrace() { return this; }

its default implementation is:

public synchronized Throwable fillInStackTrace() { if (stackTrace != null || backtrace != null /* Out of protocol state */ ) { fillInStackTrace(0); stackTrace = UNASSIGNED_STACK; } return this; }

Advantages & Disadvantages

The performance of parsing can be improved to some extent. The more semantic predicates we use, the more performance we will gain.

We can not get the stack trace of FailedPredicateException, but usually we do not care about its stack trace. If we want to address FailedPredicateException some day, we can add the state to the exception message, e.g.

setState(1126); if (!( !SemanticPredicates.isInvalidMethodDeclaration(_input) )) throw new FailedPredicateException( this, " !SemanticPredicates.isInvalidMethodDeclaration(_input), state: " + 1126 /* the state is added here */); setState(1127);
opened by daniellansun 4
Compiler errors related to CAP#1

Hi,

I am experimenting with the tunnelvisionlabs fork but met a lots of compilation errors related to "CAP#1". The errors come from my code in which I reference the context objects generated by antlr such as "Update_stmt_setContext".

I am using version 4.5. Is tunnelvisionlabs fork 100% compatible with original antlr4? Should I try a different version?

Please advise, thanks water
question wontfix

opened by waterguo 4
Bump junit from 4.11 to 4.13.1 in /antlr4-maven-plugin/src/test/projects/importsStandard
Bumps junit from 4.11 to 4.13.1.

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Commits

1b683f4 [maven-release-plugin] prepare release r4.13.1

ce6ce3a Draft 4.13.1 release notes

c29dd82 Change version to 4.13.1-SNAPSHOT

1d17486 Add a link to assertThrows in exception testing

543905d Use separate line for annotation in Javadoc

510e906 Add sub headlines to class Javadoc

610155b Merge pull request from GHSA-269g-pwp5-87pp

b6cfd1e Explicitly wrap float parameter for consistency (#1671)

a5d205c Fix GitHub link in FAQ (#1672)

3a5c6b4 Deprecated since jdk9 replacing constructor instance of Double and Float (#1660)

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dependencies
opened by dependabot[bot] 3
Bump junit from 4.11 to 4.13.1 in /runtime-testsuite
Bumps junit from 4.11 to 4.13.1.

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Commits

1b683f4 [maven-release-plugin] prepare release r4.13.1

ce6ce3a Draft 4.13.1 release notes

c29dd82 Change version to 4.13.1-SNAPSHOT

1d17486 Add a link to assertThrows in exception testing

543905d Use separate line for annotation in Javadoc

510e906 Add sub headlines to class Javadoc

610155b Merge pull request from GHSA-269g-pwp5-87pp

b6cfd1e Explicitly wrap float parameter for consistency (#1671)

a5d205c Fix GitHub link in FAQ (#1672)

3a5c6b4 Deprecated since jdk9 replacing constructor instance of Double and Float (#1660)

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dependencies
opened by dependabot[bot] 3
Bump junit from 4.11 to 4.13.1 in /runtime/Java
Bumps junit from 4.11 to 4.13.1.

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Commits

1b683f4 [maven-release-plugin] prepare release r4.13.1

ce6ce3a Draft 4.13.1 release notes

c29dd82 Change version to 4.13.1-SNAPSHOT

1d17486 Add a link to assertThrows in exception testing

543905d Use separate line for annotation in Javadoc

510e906 Add sub headlines to class Javadoc

610155b Merge pull request from GHSA-269g-pwp5-87pp

b6cfd1e Explicitly wrap float parameter for consistency (#1671)

a5d205c Fix GitHub link in FAQ (#1672)

3a5c6b4 Deprecated since jdk9 replacing constructor instance of Double and Float (#1660)

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dependencies
opened by dependabot[bot] 3
Bump plexus-utils from 3.0.15 to 3.0.16 in /antlr4-maven-plugin
Bumps plexus-utils from 3.0.15 to 3.0.16.

Commits

cf317f9 [maven-release-plugin] prepare release plexus-utils-3.0.16

26e3ae8 Remove incorrect tag element

99639d6 Little test to mimic ${project.artifactMap(g:a:c)} usage

5d46979 Needs to build with 1.7 because of some Java7 utils, but source/target needs ...

18bd77d We can't switch to Java7 yet while Maven still needs to run on Java6

3cf855c Remove release cruft

3196d4c ignore .java-version

57b636d changed XmlUtilTest to create test output directory

33091f9 Use the same method for finding the basedir as our other code.

a153249 MNG-5553 reworked dotted expressions interpreter

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dependencies
opened by dependabot[bot] 0
Merge changes from 4.10 of antlr4 RI

Hi @sharwell

The reference implementation of antlr4 was released 4.10 just now, how about merging the changes into the optimized fork? https://github.com/antlr/antlr4/releases/tag/4.10

opened by daniellansun 1
ATN clearDFA() results in nullpointer exception
public final void clearDFA() { decisionToDFA = new DFA[decisionToState.size()]; for (int i = 0; i < decisionToDFA.length; i++) { decisionToDFA[i] = new DFA(decisionToState.get(i), i); }

the clearDFA function of ATN.java first reinitializes the DFA array and then assigns the value to array elements, due to this when parallel parsers are in use, calling clearDFA from one parser results in getting nullpointer exception in multithreaded scenarios

java.lang.NullPointerException: null at org.antlr.v4.runtime.atn.ParserATNSimulator.adaptivePredict(ParserATNSimulator.java:367) ~[antlr4-runtime-4.9.0.jar:4.9.0] at org.antlr.v4.runtime.atn.ParserATNSimulator.adaptivePredict(ParserATNSimulator.java:357) ~[antlr4-runtime-4.9.0.jar:4.9.0]

From the ANTLR main release branch i can see the clearDFA logic is written without the reinitilization of DFA array.. so whether this is a bug in the optimized fork ?

public final void clearDFA() { for (int i = 0; i < decisionToDFA.length; i++) { decisionToDFA[i] = new DFA(decisionToState.get(i), i); }
opened by chandra-kambham 1
How to build tool or where to get it from in order to generate optimized classes

Hi, I am trying to find the tool of the optimized build but I could not build it. Can you guide me how to make it or where to get it from? As I see it should generate different output than the default tool if I want to use it with the optimized runtime.

opened by Marti2203 0
"TypeError: Class constructor Lexer cannot be invoked without 'new'"

$antlr4 -Dlanguage=JavaScript SplParser.g4

Generate file：SplParserLexer.js.

In SplParserLexer.js codes:

function SplParserLexer(input) { antlr4.Lexer.call(this, input); this._interp = new antlr4.atn.LexerATNSimulator(this, atn, decisionsToDFA, new antlr4.PredictionContextCache()); return this; }

Browser error："TypeError: Class constructor Lexer cannot be invoked without 'new'"

How to solve it,please?

opened by queenlixiaoman 0

Releases(4.9.0-opt)

4.9.0-opt(Dec 29, 2020)

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4.7.4-opt(Dec 29, 2020)

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4.7.3-opt(Feb 11, 2019)
This is release 4.7.3 of the "optimized" fork of ANTLR 4. The release incorporates changes made during the official 4.7.2 release, with the following notable changes.

Only the Java target is included with this release. The serialized ATN representation used by this release differs from the official release, preventing its use with other targets.

This release builds on the 4.7.2 (Optimized) release by the following:

Improved support for baseContext

Mark antlr4-annotations as an optional dependency, since it's embedded inside antlr4-runtime anyway

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4.7.2-opt(Dec 23, 2018)
This is release 4.7.2 of the "optimized" fork of ANTLR 4. The release incorporates changes made during the official 4.7.2 release, with the following notable changes.

Only the Java target is included with this release. The serialized ATN representation used by this release differs from the official release, preventing its use with other targets.

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4.7.1-opt(Apr 9, 2018)
This is release 4.7.1 of the "optimized" fork of ANTLR 4. The release incorporates changes made during the official 4.7.1 release, with the following notable changes.

Only the Java target is included with this release. The serialized ATN representation used by this release differs from the official release, preventing its use with other targets.

The following performance improvement was made for the optimized release:

tunnelvisionlabs/antlr4#28

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4.7-opt(Aug 8, 2017)
This is release 4.7 of the "optimized" fork of ANTLR 4. The release incorporates changes made during the official 4.7 release, with the following notable changes.

Only the Java target is included with this release. The serialized ATN representation used by this release differs from the official release, preventing its use with other targets.

The following fixes from the official ANTLR 4.7.1 are also included:

antlr/antlr4#1818

antlr/antlr4#1945

antlr/antlr4#1969

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4.6.0.3-opt(Jan 6, 2017)
This patch release builds on the 4.6.0.1 (Optimized) release with fixes for the following issues:

antlr/antlr4#1576 (compatibility improvement to support the optimized TypeScript target)

antlr/antlr4#1582 (bug fixes for previous compatibility improvement)

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4.6.0.1-opt(Jan 4, 2017)
This patch release builds on the 4.6 (Optimized) release with fixes for the following issues:

antlr/antlr4#1543 (also reported here as #13)

antlr/antlr4#1556

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4.6-opt(Dec 30, 2016)
This is release 4.6 of the "optimized" fork of ANTLR 4. The release incorporates changes made during the official 4.6 release, with the following notable changes.

Only the Java target is included with this release. The serialized ATN representation used by this release differs from the official release, preventing its use with other targets.

The following fixes from the official ANTLR 4.6.1 are also included:

antlr/antlr4#1546

antlr/antlr4#1544

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