syntax: Implement raw format strings

Fixes #21

Author: nfnty

syntax/python.vim

@@ -222,13 +222,18 @@ else
   syn region pythonRawString  start=+[rR]'''+ skip=+\\'+ end=+'''+ keepend contains=pythonDocTest,pythonSpaceError,@Spell
   syn region pythonRawString  start=+[rR]"""+ skip=+\\"+ end=+"""+ keepend contains=pythonDocTest2,pythonSpaceError,@Spell
 
+  syn region pythonRawFString   start=+\%([fF][rR]\|[rR][fF]\)'+ skip=+\\\\\|\\'\|\\$+ excludenl end=+'+ end=+$+ keepend contains=pythonRawEscape,@Spell
+  syn region pythonRawFString   start=+\%([fF][rR]\|[rR][fF]\)"+ skip=+\\\\\|\\"\|\\$+ excludenl end=+"+ end=+$+ keepend contains=pythonRawEscape,@Spell
+  syn region pythonRawFString   start=+\%([fF][rR]\|[rR][fF]\)'''+ skip=+\\'+ end=+'''+ keepend contains=pythonDocTest,pythonSpaceError,@Spell
+  syn region pythonRawFString   start=+\%([fF][rR]\|[rR][fF]\)"""+ skip=+\\"+ end=+"""+ keepend contains=pythonDocTest,pythonSpaceError,@Spell
+
   syn region pythonRawBytes  start=+\%([bB][rR]\|[rR][bB]\)'+ skip=+\\\\\|\\'\|\\$+ excludenl end=+'+ end=+$+ keepend contains=pythonRawEscape,@Spell
   syn region pythonRawBytes  start=+\%([bB][rR]\|[rR][bB]\)"+ skip=+\\\\\|\\"\|\\$+ excludenl end=+"+ end=+$+ keepend contains=pythonRawEscape,@Spell
   syn region pythonRawBytes  start=+\%([bB][rR]\|[rR][bB]\)'''+ skip=+\\'+ end=+'''+ keepend contains=pythonDocTest,pythonSpaceError,@Spell
   syn region pythonRawBytes  start=+\%([bB][rR]\|[rR][bB]\)"""+ skip=+\\"+ end=+"""+ keepend contains=pythonDocTest2,pythonSpaceError,@Spell
 endif
 
-syn match pythonRawEscape +\\['"]+ display transparent contained
+syn match pythonRawEscape +\\['"]+ display contained
 
 if s:Enabled('g:python_highlight_string_formatting')
   " % operator string formatting
@@ -247,9 +252,9 @@ if s:Enabled('g:python_highlight_string_format')
     syn match pythonStrFormat '{{\|}}' contained containedin=pythonString,pythonUniString,pythonUniRawString,pythonRawString
     syn match pythonStrFormat '{\%(\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*\|\d\+\)\=\%(\.\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*\|\[\%(\d\+\|[^!:\}]\+\)\]\)*\%(![rsa]\)\=\%(:\%({\%(\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*\|\d\+\)}\|\%([^}]\=[<>=^]\)\=[ +-]\=#\=0\=\d*,\=\%(\.\d\+\)\=[bcdeEfFgGnosxX%]\=\)\=\)\=}' contained containedin=pythonString,pythonUniString,pythonUniRawString,pythonRawString
   else
-    syn match pythonStrFormat "{{\|}}" contained containedin=pythonString,pythonRawString,pythonFString
+    syn match pythonStrFormat "{{\|}}" contained containedin=pythonString,pythonRawString,pythonFString,pythonRawFString
     syn match pythonStrFormat "{\%(\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*\|\d\+\)\=\%(\.\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*\|\[\%(\d\+\|[^!:\}]\+\)\]\)*\%(![rsa]\)\=\%(:\%({\%(\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*\|\d\+\)}\|\%([^}]\=[<>=^]\)\=[ +-]\=#\=0\=\d*,\=\%(\.\d\+\)\=[bcdeEfFgGnosxX%]\=\)\=\)\=}" contained containedin=pythonString,pythonRawString
-    syn region pythonStrInterpRegion start="{"he=e+1,rs=e+1 end="\%(![rsa]\)\=\%(:\%({\%(\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*\|\d\+\)}\|\%([^}]\=[<>=^]\)\=[ +-]\=#\=0\=\d*,\=\%(\.\d\+\)\=[bcdeEfFgGnosxX%]\=\)\=\)\=}"hs=s-1,re=s-1 extend contained containedin=pythonFString contains=pythonStrInterpRegion,@pythonExpression
+    syn region pythonStrInterpRegion start="{"he=e+1,rs=e+1 end="\%(![rsa]\)\=\%(:\%({\%(\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*\|\d\+\)}\|\%([^}]\=[<>=^]\)\=[ +-]\=#\=0\=\d*,\=\%(\.\d\+\)\=[bcdeEfFgGnosxX%]\=\)\=\)\=}"hs=s-1,re=s-1 extend contained containedin=pythonFString,pythonRawFString contains=pythonStrInterpRegion,@pythonExpression
   endif
 endif
 
@@ -424,6 +429,7 @@ if v:version >= 508 || !exists('did_python_syn_inits')
 
   HiLink pythonString           String
   HiLink pythonRawString        String
+  HiLink pythonRawEscape        Special
 
   HiLink pythonUniEscape        Special
   HiLink pythonUniEscapeError   Error
@@ -441,6 +447,7 @@ if v:version >= 508 || !exists('did_python_syn_inits')
     HiLink pythonBytesEscape        Special
     HiLink pythonBytesEscapeError   Error
     HiLink pythonFString            String
+    HiLink pythonRawFString         String
     HiLink pythonStrInterpRegion    Special
   endif