[#ANTLR-105] Extra backslash generated for literals in lexer

ANTLR v3

Extra backslash generated for literals in lexer

Created: 12/Apr/07 12:02 PM Updated: 27/Dec/07 01:49 PM

Component/s:

None

Affects Version/s:

3.0b6

Fix Version/s:

3.1

Description

« Hide

Weird

SIMPLE_ESCAPE_SEQUENCE
        : '\"'
        ;

generates:

match('\"');

but

SIMPLE_ESCAPE_SEQUENCE
        : '\\\"'
        ;

gens

match("\\\\"");

All

Comments

Change History

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Terence Parr - 28/Jun/07 12:27 PM

Johannes Luber says he has reproduced with the following:

grammar BackslashBugTest;

data: CHARACTER*;

CHARACTER
: SINGLE_CHARACTER
| SIMPLE_ESCAPE_SEQUENCE
;

fragment SINGLE_CHARACTER
: ~('\'' | '\\' | NEW_LINE_CHARACTER )
;

fragment SIMPLE_ESCAPE_SEQUENCE
: '\\\''
| '\\\"'
| '\\\\'
| '\\0'
| '\\a'
| '\\b'
| '\\f'
| '\\n'
| '\\r'
| '\\t'
| '\\v'
;

NEW_LINE_CHARACTER
: '\u000D' // Carriage return character
| '\u000A' // Line feed character
| '\u0085' // Next line character
| '\u2028' // Line separator character
| '\u2029' // Paragraph separator character

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Terence Parr - 27/Dec/07 01:49 PM

Target.getTargetStringLiteralFromANTLRStringLiteral() escape " that were already escaped.