I have a text file which am parsing through antlr4. Text format Grammar Rules I get this What am i doing wrong and how could i make these rules better? Answer Your example input get properly parsed if you start with the init rule: prints: which looks like this indented: My guess is that the error you’re getting is produced
Tag: antlr4
ANTLR4 Return values from a function
Im making a programming language as a project at my University and I’ve run into a problem with adding a return statement in functions. This is my grammar: And here is the custom visitor To help with transferring data I have made classes to carry values and function data. The problem I have atm is when I make a function
Separate definitions of decimal number and word in ANTLR grammar
I’m working on defining a grammar in ANTLR4 which includes words and numbers separately. Numbers are described: and words are described: The simplified grammar below describes the addition between either a word or a letter (and needs to be defined recursively like this): The issue is that when I enter ‘d3’ into the parser, I get a returned instance of
How to instruct the grammar to NOT generate certain methods in the ANTLR listener?
I have this grammar: foo : bar EOF; bar : ‘hello’; The listener interface, which ANTLR generates, contains these four methods: public void enterFoo(final FooParser.LicenseContext ctx); public void …
Antlr4 Project Directory Structure Issue
I’m trying to set up an Antlr4 project using Java’s package directory structure. The top level directory contains PondParser.g4, PondLexer.g4, and build_script. build_script is expected to build and …
How to extract line with syntax error when parsing PlSQL using Antlr4
I am using the grammar file for PlSql from this Github repository. I want to underline the line in plsql file that I parse if it has a syntax error. I have the following snippet to do so: public …
Antlr4: getting an ordered list of tokens?
I have this parser rule: multiplication : pow (operator = (TIMES | DIVIDE | FLOOR_DIVIDE | MODULO) pow)* ; And I’m iterating over the pows using ctx.pow(), but I would like to know too what …
ANTLR Visitor Implementation For ArrayInitVisitorImpl
I am trying to build a visitor implementation that will convert a string array to unicode. I am using the following grammar: grammar ArrayInit; init : ‘{‘ value (‘,’ value)* ‘}’ ; value : init …
antlr4 – get left and right sibling of rule context
An easy question, on which I cannot find something useful in the API docs: is there a way to get the left and right sibling of a ParserRuleContext? Say I have in my .g4: identifiers : identifier (‘,’…