Hello- I'm working on a grammar that needs to support embedded blanks in
strings: "identifier=two words"
The interpreter keeps breaking at 'two' and doesn't know what to do with
'words'.
I was initially ignoring white space (because 'id1 = oneword, id2 =" two
words"' must also be supported with spaces around the = and ,), but obviously,
can't do that.
I have tried what was suggested in an archived post:
STRING_LITERAL : (STRCHAR)+ ( ((' ')+ STRCHAR)=> (' ')+ (STRCHAR)+ )*
But that didn't work either! (no viable alternative at input 'words'). It's not
including 'words' as part of the string.
In my grammar:
fragment LETTER :('a'..'z' | 'A'..'Z');
fragment DIGIT : '0'..'9';
fragment OTHERCHARS : ('.' | '/' | '-' | '&');
STRCHAR : (LETTER | DIGIT | OTHERCHARS)+;
I have tried various combinations of handling the blank in the lexing v. the
parsing, including trying to create a quoted-string rule.
I will have to support the following:
"identifier =two words"
identifier ="two words"
The identifier=value pairs appear in a comma-separated line. There are various
nested structures of identifier=value pairs involved, which is why both of the
above formats are supported.
*** Bottom line*** I just want to indicate: If a space appears between
quotation marks, include it as part of the current token; if not, throw it away.
I have everything working in a complex structure and tree walker except for the
embedded blanks allowed in strings! Any suggestions are appreciated.
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