In Antlr 4, I have a grammar which takes strings of format x*Y, x+y, etc I want to catch an error when an invalid operator is used, such as x&y. If I add code like: parser.RemoveErrorListener...

I have rules that look something like this: INTEGER : [0-9]+; field3 : INTEGER COMMA INTEGER; In the parsed tree I get an List called INTEGER with two elements. I would rather find a way for ea...

I am wondering if are there any examples (googling I haven't found any) of TAB auto-complete solutions for Command Line Interface (console), that use ANTLR4 grammars for predicting the next term (l...

I'm using the JSON grammar from the antlr4 grammar repository to parse JSON files for an editor plugin. It works, but reports invalid chars one by one. The following snippet results in 18 lexer err...

I have Java code generated from ANTLR4. Scala is using the Java code by extending some of the methods. The issue is that IntelliJ's scala plugin does not seem to know the relationship between Java ...

so found a nice grammar for a calculator and copied it with some lil changes from here: https://dexvis.wordpress.com/2012/11/22/a-tale-of-two-grammars/ I have two Files: Parser and Lexer. Looks li...

I'm currently trying to develope a JavaScript Compiler with the help of an Antlr4 Visitor. I've got this already implemented with Java but cannot figure out how to do this in JavaScript. Probably s...

I've been learning about ANTLR 4 with Terence Parr's The Definitive ANTLR 4 Reference, which I've been following so far using Gradle 2.10 and its built-in ANTLR plugin. However I'm having some trou...

Introduction Looking at the documentation, ANTLR 2 used to have something called predicated lexing, with examples like this one (inspired by Pascal): RANGE_OR_INT : ( INT ".." ) => INT { $set...

I'm pretty new to ANTLR4 and now I'm trying to undertand which kind of grammars we might define with it. As far as I got, there're two kind of rules in ANTLR: parser rules (lower case words) and ...

I am using the ANTLR4 IntelliJ plug-in, and I am using a the Antlr-4.5.1 Jar. When I Generate Antlr Recognizer in Lexer and Parser can't resolve symbols RuntimeMetaData and Vocabulary. If I use t...

I have a large grammar file, and plan to split it into multiple ones, so that I can reuse some of those smaller files in another grammar file. I have tried doing it but failed. Can you please tell ...

I have a .g4 grammar for vba/vb6 a lexer/parser, where the lexer is skipping line continuation tokens - not skipping them breaks the parser and isn't an option. Here's the lexer rule in question: ...

I found an ANTLRv4 Python3 grammer, but it generates a parse-tree, which generally has many useless nodes. I'm looking for a known package to get a Python AST from that parse tree. Does somethi...

I'm (now) trying to use ANTLR4 and C# to design a language, and so far I've been fiddling around with it. In the process, I decided to try and create a simple mathematical expression evaluator. In ...

Suppose I have the following: variableDeclaration: Identifier COLON Type SEMICOLON; Type: T_INTEGER | T_CHAR | T_STRING | T_DOUBLE | T_BOOLEAN; where those T_ names are just defined as "integer"...

I'm trying to use ANTLR V4 with the publicly given Java 8 grammar - https://github.com/antlr/grammars-v4/blob/master/java8/Java8.g4 I generated the class files and tried to parse the Java 8 JRE, b...

In the language I work with, some keywords must be at the start of the line. This is mainly because string values within the language can go over multiple lines, and strings could easily contain th...

I created a grammar for boolean expressions and now I'm trying to implement visitor for evaluating it. It is told that there is no need to overcomplicate grammar lexer and parser rules with semant...

I have a very simple test grammar as following: grammar Test; statement: expression EOF; expression : Identifier | expression binary_op expression | expression assignment_operator expression ...

I want to catch errors like line 1:1 extraneous input '\r\n' expecting {':', '/',} line 1:1 mismatched input 'Vaasje' expecting 'Tafel' I tried wrapping my functions in try-catch but, as expect...

I'm trying to create a Beginning-Of-Line token: lexer grammar ScriptLexer; BOL : {getCharPositionInLine() == 0;}; // Beginning Of Line token But the above emits the error The name 'getCharPosi...

I have a simple HelloWorld.g4 grammar (see it at the bottom). I am able to successfully generate the .py files using this: set CLASSPATH=.;antlr-complete.jar;%CLASSPATH% java org.antlr.v4.Tool -D...

I am currently researching for an elegant way, for my REST API under development, to express filters for GET requests returning collections. I'd like to express queries as "http://[...]?filter=expr...

I'm trying to use antlr4 version 4.4 and the python2 runtime. The grammar is from the antlr4 book, page 6, file: Hello.g4: grammar Hello; r : 'hello' ID ; ID : [a-z]+ ; WS : [ \t\r\n]+ -> skip...