I've read the section on error reporting and recovery from "the book" but
still can't figure out what may be a simple problem.
I want to parse a file that consists of bibliographic entries. Each entry
is on one line (so each record ends with \n).
If a record does not match, I just want to print an error message, and skip
to the end of line and start again with the next record.
If I understand chapter 10 correctly, then '\n' should be in the
resynchronization set, and the parser will consume tokens until it finds
one.
This isn't happening. Once I get an error, the parser never recovers. I
get a bunch of NoViableAlt exceptions. I'm hoping someone can explain what
I'm doing wrong.
Here is a sample input file. The 1st and 3rd lines are ok, the 2nd line is
an error.
Name. "Title," Periodical, 2005, v41(3,Oct), 217-240.
Name. "Title," Periodical, 2005, v41(3,Oct), Article 2.
Name. "Title," Periodical, 2005, v41(3,Oct), 217-240.
Here is the grammar:
grammar Periodical;
article_list
: (article NL)* article NL?
;
article
: a=authors PERIOD SPACE QUOTE t=title COMMA QUOTE SPACE j=journal
COMMA SPACE y=year COMMA SPACE v=volume COMMA SPACE p=pages PERIOD SPACE*
;
authors : (~QUOTE)+;
title : (~QUOTE)+;
journal : (LETTER|SPACE|COMMA|DASH)+;
volume : (LETTER|DIGIT)+
| (LETTER|DIGIT)+ '(' (LETTER|DIGIT|SLASH|COMMA)+ ')'
;
year : DIGIT DIGIT DIGIT DIGIT;
pages : DIGIT+ DASH DIGIT+;
PERIOD : '.';
QUOTE : '"';
COMMA : ',';
SPACE : ' ';
DIGIT : '0'..'9';
LETTER : ('a'..'z')|('A'..'Z');
DASH : '-';
SLASH : '/';
NL : '\r'? '\n';
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