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Improve string highlighting #74

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5740963
Highlight string escape sequences
dkearns Sep 6, 2021
148fd00
Highlight byte strings
dkearns Sep 6, 2021
ab2de1b
Add syntax based folding for here strings
dkearns Sep 6, 2021
8f0c430
Highlight invalid string escape sequences as errors
dkearns Sep 6, 2021
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26 changes: 24 additions & 2 deletions syntax/racket.vim
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Original file line number Diff line number Diff line change
Expand Up @@ -497,8 +497,27 @@ syn region racketStruc matchgroup=Delimiter start="\["rs=s+1 matchgroup=Delimite
syn region racketStruc matchgroup=Delimiter start="#\["rs=s+2 matchgroup=Delimiter end="\]"re=e-1 contains=@racketNormal

" Simple literals
syn region racketString start=/\%(\\\)\@<!"/ skip=/\\[\\"]/ end=/"/
syn region racketString start=/#<<\z(.*\)$/ end=/^\z1$/

" Strings

syn match racketStringEscapeError "\\." contained display

syn match racketStringEscape "\\[abtnvfre'"\\]" contained display
syn match racketStringEscape "\\$" contained display
syn match racketStringEscape "\\\o\{1,3}\|\\x\x\{1,2}" contained display

syn match racketUStringEscape "\\u\x\{1,4}\|\\U\x\{1,8}" contained display
syn match racketUStringEscape "\\u\x\{4}\\u\x\{4}" contained display

syn region racketString start=/\%(\\\)\@<!"/ skip=/\\[\\"]/ end=/"/ contains=racketStringEscapeError,racketStringEscape,racketUStringEscape
syn region racketString start=/#"/ skip=/\\[\\"]/ end=/"/ contains=racketStringEscapeError,racketStringEscape

if exists("racket_no_string_fold")
syn region racketString start=/#<<\z(.*\)$/ end=/^\z1$/
else
syn region racketString start=/#<<\z(.*\)$/ end=/^\z1$/ fold
endif


syn cluster racketNormal add=racketError,racketConstant,racketStruc,racketString
syn cluster racketQuotedOrNormal add=racketString
Expand Down Expand Up @@ -633,6 +652,9 @@ if version >= 508 || !exists("did_racket_syntax_inits")
HiLink racketFunc Function

HiLink racketString String
HiLink racketStringEscape Special
HiLink racketUStringEscape Special
HiLink racketStringEscapeError Error
HiLink racketChar Character
HiLink racketBoolean Boolean

Expand Down