mismatched input 's' expecting ID

[lexasub]

hello, i get error:mismatched input 'import' expecting 'import'.
i use this code: CharStream stream = CharStreams.fromFileName("./test", StandardCharsets.US_ASCII);
langosLexer lexer = new langosLexer(stream);
CommonTokenStream tokens = new CommonTokenStream(lexer);
langosWithoutSyntaxParser parser = new langosWithoutSyntaxParser(tokens);
MylangosWithoutSyntaxVisitor visitor = new MylangosWithoutSyntaxVisitor();
System.out.print(visitor.visitEntry_point(parser.entry_point()));
//https://github.com/lexasub/langA/blob/master/src/org/lexasub/langosThirdTryWithoutPromise/IO.java
my grammatic:
https://github.com/lexasub/langA/blob/master/langosWithoutSyntax.g4

[parrt]

You need to look at what token type is actually being matched; no doubt there is a duplicate rule to match it important

[lexasub]

can I please elaborate? I didn't understand you

[lexasub]

*may you say about it more?

[parrt]

sure. First i suggest using the ANTLR plugin in intellij. Next you likely have a rule set in this order:

ID : [a-z]+ ;
IMPORT : 'import' ;

Then the parser will look for IMPORT but see ID.

[lexasub]

in ANTLR plugin in intellij parse tree on"import a;" is normal.
//temporary i reduce rule entry_point->entry_point : import_ EOF;
entry_point
import_ eof
IMPORT ID:a SEMI

if ID higher than IMPORT, plugin say:"line 1:0 missing 'import' at 'import'
line 1:7 extraneous input 'a' expecting {'.', ';'}"
result of program also mismatched input 'import' expecting 'import'.

[lexasub]

output of plugin(leafs)
IMPORT:missing 'import' ID:import ID:a SEMI

[lexasub]

i don't know, why plugin output != result of program. result of program is line 1:0 mismatched input 'import' expecting 'import', but plugin give tree without error

[lexasub]

as far as I understand, first you need to list complete matches in the lexical rules. Symbols and keywords. then we write lexical rules like ID. I tried to make ID a parser rule, but still the problem persists. in the plugin, everything is parsed normally (the tree is normally built), and when the program starts, the result is different.

[lexasub]

my version is antlr4.10.1. I barely made up main with visitor, maybe I did something wrong. I need the code for visitor.
CharStream stream = CharStreams.fromFileName("./test", StandardCharsets.US_ASCII);
langosLexer lexer = new langosLexer(stream);
CommonTokenStream tokens = new CommonTokenStream(lexer);
langosWithoutSyntaxParser parser = new langosWithoutSyntaxParser(tokens);
MylangosWithoutSyntaxVisitor visitor = new MylangosWithoutSyntaxVisitor();
System.out.print(visitor.visitEntry_point(parser.entry_point()));

[lexasub]

my custom visitor is public class MylangosWithoutSyntaxVisitor implements langosWithoutSyntaxVisitor {}

[parrt]

Your code looks fine so it's got to be something to do with the order of the rules or whatever. I recommend just verifying that input symbols are matched as the correct token type. There's no point in me identifying it for you because I guarantee this is the issue.

[lexasub]

[fixed]my problem was in incorrect using combination of somesing(i did some"random" changes and it working)

please, add guide for visitor using(and it). my example:
CharStream stream = CharStreams.fromFileName("./test", StandardCharsets.US_ASCII);//you may use antlr reader, as in other examples
langosWithoutSyntaxLexer lexer = new langosWithoutSyntaxLexer(stream);
CommonTokenStream tokens = new CommonTokenStream(lexer);
langosWithoutSyntaxParser parser = new langosWithoutSyntaxParser(tokens);
MylangosWithoutSyntaxVisitor visitor = new MylangosWithoutSyntaxVisitor();

in you visitor class:

public class MylangosWithoutSyntaxVisitor extends langosWithoutSyntaxBaseVisitor {
@OverRide public String visitProgram(langosWithoutSyntaxParser.ProgramContext ctx){
if(ctx.import_() != null) return visitImport_(ctx.import_());
return visitElement(ctx.element());
}
....
}

[lexasub]

thank you very much