Why parser ignores single quotes?

[Eugene Lepekhin]

Hi,

I have the following lexer file FusionLexer.g4:

lexer grammar FusionLexer;
NumberLiteral: DecNumber;
fragment DecNumber: NonzeroDigit DecDigit*;
fragment DecDigit: [0-9];
fragment NonzeroDigit: [1-9];
Whitespace: [ \t\r\n]+ -> skip;

And the parser file FusionParser.g4:

parser grammar FusionParser;
fusionProgram: number* EOF;
number: NumberLiteral;

When I parse the following text:

'8 '9
'10

I am getting a valid parse tree:

(fusionProgram (number 8) (number 9) (number 10) <EOF>)

Which is puzzling me as I'd expect a syntax error as quotes are not allowed anywhere in the grammar.

Can someone shed some light on what is going on here?

Thanks,

Eugene

[Terence Parr]

hiya we've moved questions to https://stackoverflow.com/questions/tagged/antlr4  Could you repost there?

In this case, you probably have token errors that are being ignored.

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