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Hello all,
I have a question about the "Mismatched input 'foo' expecting set null" error.
Here are the relevant parts of the grammar I am working on:
for_expr: for_t space name (wspace in_t space word)? semiel do_t wspace
list semiel done_t -> ^(for_t name (word)? list);
space : BLANK;
wspace : BLANK | EOL;
name : FILEPATH;
semiel : BLANK? (';' | EOL) BLANK?;
for_t : 'for';
in_t : 'in';
do_t : 'do';
done_t : 'done';
word : command_sub;
BLANK : (' '|'\t')+;
EOL : ('\r'?'\n') ;
fragment
FILENAME: '"'(ALPHANUM|'.'|'-'|'_')(ALPHANUM|'.'|' '|'-'|'_')*'"'
| (ALPHANUM|'.'|'-'|'_')(ALPHANUM|'.'|'-'|'_')*;
FILEPATH: '/'?FILENAME('/'FILENAME)*;
I'm testing my grammar with gunit, and I'm using the following input:
"for asdf; do
time cat; done" -> (for asdf (cat time))
This succeeds and does not fail the unit test. However, if I give it the input
"for asdf; do
time cat
done" -> (for asdf (cat time))
I get the error:
test1 (for_expr, line4) -
expected: (for asdf (cat time))
actual: line 3:0 mismatched input 'done' expecting set null
The debugger in ANTLRworks allows this input (I copied and pasted from the
gunit file to the debugger input window) and shows the correct abstract syntax
tree. Everything I've been able to find on the list so far has boiled down to
white space which I've checked repeatedly. What I cannot figure out is why
changing the one character makes a difference.
Is there something obvious that I am doing wrong? I'm still fairly new to
ANTLR, and this is a very ambitious project, so any help would be greatly
appreciated.
Thanks,
Nathan
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