Comments (1)
The problem in your example is that foo
is a perfectly valid identifier as part of your specification and the id
parser succeeds. The error message "\n" expected at 1:4
is produced somewhere else in your grammar.
A common way to fix this is to use a negative lookahead. With it you can assert that your ID is not followed by a dot, i.e.
Parser<String> id() => (((letter() | char('_')) &
(letter() | digit() | anyOf('_- ()')).star() &
char('.').not('end of id expected')))
.flatten();
For the input foo.1
this gives end of id expected at 1:4
.
Note: I also moved the flatten
operator around everything, then you don't need the custom flattening with the map
operator.
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