Hello, List!
I try to develop a lexer\parser for SIP portocol grammar. But now I have the
following error after an attempt to parse "INVITE sip:ssedai" string:
line 1:12 mismatched character 's' expecting 'i'
line 1:13 no viable alternative at character 'e'
line 1:14 no viable alternative at character 'd'
line 1:15 no viable alternative at character 'a'
line 1:16 no viable alternative at character 'i'
line 0:-1 required (...)+ loop did not match anything at input '<EOF>'
Here is my grammar:
### grammar beginning ###
grammar testGrammar;
options {
language = Java;
backtrack = true;
output = AST;
}
request : request_line EOF;
request_line : method SP request_uri;
method : Invite;
Invite : 'INVITE';
SIP_BEGIN : 'sip:';
SP : ' ';
request_uri : sip_url;
sip_url : SIP_BEGIN user;
user : (LOWALPHA+) -> LOWALPHA+;
fragment LOWALPHA : 'a'..'z';
#### grammar end #####
What I am doing wrong? Thanks in advance.
--
Sergey Smolov
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