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Currently I have JavaScript (.js) files that contain multiline strings. Vim's syntax highlighting does not seem to support these, as seen in the image below:
Anything below the first line is not properly recognized as a string, and everything after the end quote is incorrectly considered a string. Any way to fix this?
The /usr/share/vim/vim74/syntax/javascript.vim uses this to define what a "string region" is in Javascript:
syn region javaScriptStringD start=+"+ skip=+\\\\\|\\"+ end=+"\|$+ contains=javaScriptSpecial,@htmlPreproc
The end option matches either the " character, or the end of the line $, which is why the syntax highlighting stops after the first line.
We can override this by making a ~/.vim/after/syntax/javascript.vim file with:
syn region javaScriptStringD start=+"+ skip=+\\\\\|\\"+ end=+"+ contains=javaScriptSpecial,@htmlPreproc
syn region javaScriptStringS start=+'+ skip=+\\\\\|\\'+ end=+'+ contains=javaScriptSpecial,@htmlPreproc
One line for "strings", and another for 'strings'. We just removed the |$ part (| for "or", $ for end of line).
Note: I think it would be better to only highlight the string if the previous line escapes the \n (ie. ends with \). I happen to know that the C syntax does this, but I can't seem to steal borrow that and get it working in Javascript :-/
