I'm trying to create a language definition for the Monaco editor. The language is a very opinionated language to which I don't control the compiler, etc.
The "\" escape character is universal; single-line comments can be continued to the next line by ending in "\"
Some examples, using C++-style comments:
// This comment \
continues on the following line
// This one does NOT continue \\
because the escape char was itself escaped
// This one DOES continue because \\\
the 1st '\' escapes the 2nd; the 3rd escapes EOL
// This comment continues to the following line \
But the line was empty. This should not be commented.
I have implemented all of the semantics except the last part, because it does not appear to me possible to match on an empty line. The closest I found in documentation was '@eos' but I cannot figure out how to use it. Here is my current implementation:
comments: [
[/\/\/$/, 'comment'], // empty single-line comment
[/\/\//, 'comment', '@comment_cpp'],
],
comment_cpp: [
[/(?:[^\\]|(?:\\.))+$/, 'comment', '@pop'],
[/.+$/, 'comment'],
],
Is there a rule I can add that will enable me to "@pop" out of the "@comment_cpp" rule on an empty line so the following is true?
// This comment continues to the following line \
and this one continues to the following empty line \
But this line is not commented
This issue was since resolved; the monaco team added support for matching on /$/.