Hello,
I am working on a recognizer that processes a text file, each line of which
starts with one of short list of about 20 characters (mostly either upper case
or lower case letters, a few special chars), immediately followed by a "name"
(chars or dash), a space or 2, and then various space-delimited stretches of
text comprised of arbitrarily any ASCII character Except newline, followed by
newline.
The first letter is significant - it indicates what sort of "command" each line
is.
Here's a simplified version of the grammar, with just one of these "commands"
specified:
grammar ElementAttributes;
options {
language = Java;
}
@parser::header {}
@lexer::header {}
elementAttributes : elementAttributeCommand+ EOF;
/**
e.g.
Aname IMPLIED
*/
elementAttributeCommand : ACMD NAME SPACE+ ATTRTYPE NEWLINE;
ATTRTYPE : ('IMPLIED'|'CDATA'|'NOTATION'|'ENTITY'|'TOKEN'|'ID'|'DATA');
ACMD : 'A';
NEWLINE: '\r'? '\n';
SPACE: ' ';
NAME : (NAMESTARTCHAR NAMECHAR*);
fragment LOWERCASELETTER : ('a'..'z');
fragment UPPERCASELETTER : ('A'..'Z');
fragment DIGIT : ('0'..'9');
fragment DASH : ('-');
fragment NAMESTARTCHAR : (LOWERCASELETTER | UPPERCASELETTER);
fragment NAMECHAR : (NAMESTARTCHAR | DIGIT | DASH);
If run on a file consisting only of the line (terminated with NEWLINE)
Aname IMPLIED
I get the following error:
line 1:0 required (...)+ loop did not match anything at input 'Aname'
How should I be declaring the lexer rules so that 'A' at start of line is
recognized as a command token, and yet still make it possible for the "NAME"
immediately following it to be unambiguously recognized?
Thanks
sheila
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