runtime(python): Add f-string support

runtime/syntax/python.vim

@@ -122,18 +122,18 @@ syn match pythonDecoratorName "@\s*\h\%(\w\|\.\)*" display contains=pythonDeco
 " Single line multiplication.
 syn match pythonMatrixMultiply
  \ "\%(\w\|[])]\)\s*@"
- \ contains=ALLBUT,pythonDecoratorName,pythonDecorator,pythonFunction,pythonDoctestValue
+ \ contains=ALLBUT,pythonDecoratorName,pythonDecorator,pythonFunction,pythonDoctestValue,@pythonFStringContained
  \ transparent
 " Multiplication continued on the next line after backslash.
 syn match pythonMatrixMultiply
  \ "[^\\]\\\s*\n\%(\s*\.\.\.\s\)\=\s\+@"
- \ contains=ALLBUT,pythonDecoratorName,pythonDecorator,pythonFunction,pythonDoctestValue
+ \ contains=ALLBUT,pythonDecoratorName,pythonDecorator,pythonFunction,pythonDoctestValue,@pythonFStringContained
  \ transparent
 " Multiplication in a parenthesized expression over multiple lines with @ at
 " the start of each continued line; very similar to decorators and complex.
 syn match pythonMatrixMultiply
  \ "^\s*\%(\%(>>>\|\.\.\.\)\s\+\)\=\zs\%(\h\|\%(\h\|[[(]\).\{-}\%(\w\|[])]\)\)\s*\n\%(\s*\.\.\.\s\)\=\s\+@\%(.\{-}\n\%(\s*\.\.\.\s\)\=\s\+@\)*"
- \ contains=ALLBUT,pythonDecoratorName,pythonDecorator,pythonFunction,pythonDoctestValue
+ \ contains=ALLBUT,pythonDecoratorName,pythonDecorator,pythonFunction,pythonDoctestValue,@pythonFStringContained
  \ transparent
 
 syn match pythonFunction "\h\w*" display contained
@@ -143,25 +143,98 @@ syn keyword pythonTodo FIXME NOTE NOTES TODO XXX contained
 
 " Triple-quoted strings can contain doctests.
 syn region pythonString matchgroup=pythonQuotes
- \ start=+[uU]\=\z(['"]\)+ end="\z1" skip="\\\\\|\\\z1"
+ \ start=+[uUbB]\=\z(['"]\)+ end="$\|\z1" skip="\\\\\|\\\z1"
  \ contains=pythonEscape,@Spell
 syn region pythonString matchgroup=pythonTripleQuotes
- \ start=+[uU]\=\z('''\|"""\)+ end="\z1" keepend
+ \ start=+[uUbB]\=\z('''\|"""\)+ end="\z1" keepend
  \ contains=pythonEscape,pythonSpaceError,pythonDoctest,@Spell
 syn region pythonRawString matchgroup=pythonQuotes
- \ start=+[uU]\=[rR]\z(['"]\)+ end="\z1" skip="\\\\\|\\\z1"
+ \ start=+\%([bB][rR]\=\|[rR][bB]\=\)\z(['"]\)+
+ \ end="$\|\z1" skip="\\\\\|\\\r\=$\|\\\z1"
  \ contains=@Spell
 syn region pythonRawString matchgroup=pythonTripleQuotes
- \ start=+[uU]\=[rR]\z('''\|"""\)+ end="\z1" keepend
+ \ start=+\%([bB][rR]\=\|[rR][bB]\=\)\z('''\|"""\)+
+ \ end="\z1" keepend
  \ contains=pythonSpaceError,pythonDoctest,@Spell
+syn region pythonFString matchgroup=pythonQuotes
+ \ start=+[fF]\z(['"]\)+
+ \ end="$\|\z1" skip="\\\\\|\\\z1"
+ \ contains=pythonEscape,pythonFStringEscapedBrace,pythonFStringReplacement,@Spell
+syn region pythonFString matchgroup=pythonTripleQuotes
+ \ start=+[fF]\z('''\|"""\)+
+ \ end="\z1" keepend
+ \ contains=pythonEscape,pythonSpaceError,pythonFStringEscapedBrace,pythonFStringReplacement,pythonDoctest,@Spell
+syn region pythonRawFString matchgroup=pythonQuotes
+ \ start=+\%([fF][rR]\|[rR][fF]\)\z(['"]\)+
+ \ end="$\|\z1" skip="\\\\\|\\\r\=$\|\\\z1"
+ \ contains=pythonFStringEscapedBrace,pythonFStringReplacement,@Spell
+syn region pythonRawFString matchgroup=pythonTripleQuotes
+ \ start=+\%([fF][rR]\|[rR][fF]\)\z('''\|"""\)+
+ \ end="\z1" keepend
+ \ contains=pythonSpaceError,pythonFStringEscapedBrace,pythonFStringReplacement,pythonDoctest,@Spell
 
 syn match pythonEscape +\\[abfnrtv'"\\]+ contained
 syn match pythonEscape "\\\o\{1,3}" contained
 syn match pythonEscape "\\x\x\{2}" contained
 syn match pythonEscape "\%(\\u\x\{4}\|\\U\x\{8}\)" contained
 " Python allows case-insensitive Unicode IDs: http://www.unicode.org/charts/
 syn match pythonEscape "\\N{\a\+\%(\s\a\+\)*}" contained
-syn match pythonEscape "\\$"
+syn match pythonEscape "\\\r\=$"
+
+" f-strings
+" See https://docs.python.org/3/reference/lexical_analysis.html#formatted-string-literals
+syn region pythonFStringReplacement matchgroup=pythonFStringBrace start=+{+ end=+}+ contained contains=pythonFStringExpression
+
+" Skip contained '[:!]'
+" TODO: this should contain @pythonExpression rather than TOP
+syn region pythonFStringBrackets
+ \ start="{" end="}"
+ \ contained contains=TOP
+ \ transparent
+syn region pythonFStringBrackets
+ \ start="(" end=")"
+ \ contained contains=TOP
+ \ transparent
+syn region pythonFStringBrackets
+ \ start="\[" end="]"
+ \ contained contains=TOP
+ \ transparent
+
+syn region pythonFStringReplacementWhitespace start="\s" end="\ze\S" contained nextgroup=pythonFStringConversion,pythonFStringFormatSpec
+
+" TODO: contains (yield_expr | star_expressions)
+" True False None yield from if else for lambda await
+syn cluster pythonExpression
+ \ contains=pythonNumber,python.*String,pythonOperator,pythonBuiltin,pythonAttribute,pythonComment,pythonFStringBrackets
+
+syn region pythonFStringExpression
+ \ start="." end="\ze[=!:}]"
+ \ contained contains=@pythonExpression
+ \ nextgroup=pythonFStringEquals,pythonFStringConversion,pythonFStringFormatSpec
+
+" TODO: it would be better to match pythonOperator with priority but symbolic
+" operators are not currently matched
+" skip operators
+syn match pythonFStringEquals "[!<>=]\@1<!==\@!"
+ \ contained
+ \ nextgroup=pythonFStringConversion,pythonFStringFormatSpec,pythonFStringReplacementWhitespace,pythonComment
+ \ skipwhite skipempty
+hi def link pythonFStringEquals Special
+
+syn match pythonFStringConversion "![ars]"
+ \ contained
+ \ nextgroup=pythonFStringFormatSpec,pythonFStringReplacementWhitespace,pythonComment
+ \ skipwhite skipempty
+hi def link pythonFStringConversion Special
+
+syn region pythonFStringFormatSpec
+ \ matchgroup=Delimiter start=":" matchgroup=NONE end="\ze}"
+ \ contained contains=pythonFStringReplacement
+hi def link pythonFStringFormatSpec Special
+
+syn match pythonFStringEscapedBrace "{{\|}}" contained
+
+syn cluster pythonFStringContained contains=pythonFString.\+
 
 " It is very important to understand all details before changing the
 " regular expressions below or their order.
@@ -226,7 +299,7 @@ if !exists("python_no_builtin_highlight")
  syn keyword pythonBuiltin tuple type vars zip __import__
  " avoid highlighting attributes as builtins
  syn match pythonAttribute /\.\h\w*/hs=s+1
- \ contains=ALLBUT,pythonBuiltin,pythonFunction,pythonAsync
+ \ contains=ALLBUT,pythonBuiltin,pythonFunction,pythonAsync,@pythonFStringContained
  \ transparent
 endif
 
@@ -283,7 +356,7 @@ if !exists("python_no_doctest_highlight")
  if !exists("python_no_doctest_code_highlight")
  syn region pythonDoctest
  \ start="^\s*>>>\s" end="^\s*$"
- \ contained contains=ALLBUT,pythonDoctest,pythonFunction,@Spell
+ \ contained contains=ALLBUT,pythonDoctest,pythonFunction,@pythonFStringContained,@Spell
  syn region pythonDoctestValue
  \ start=+^\s*\%(>>>\s\|\.\.\.\s\|"""\|'''\)\@!\S\++ end="$"
  \ contained
@@ -312,9 +385,13 @@ hi def link pythonComment Comment
 hi def link pythonTodo Todo
 hi def link pythonString String
 hi def link pythonRawString String
+hi def link pythonFString String
+hi def link pythonRawFString String
 hi def link pythonQuotes String
 hi def link pythonTripleQuotes pythonQuotes
 hi def link pythonEscape Special
+hi def link pythonFStringEscapedBrace Special
+hi def link pythonFStringBrace Include
 if !exists("python_no_number_highlight")
  hi def link pythonNumber Number
 endif

runtime/syntax/testdir/dumps/python_fstring_00.dump

@@ -0,0 +1,20 @@
+>#+0#0000e05#ffffff0| |P|y|t|h|o|n| |f|-|s|t|r|i|n|g| |t|e|s|t|s| +0#0000000&@51
+@75
+|#+0#0000e05&| |P|y|t|h|o|n|-|3|.|1|2|.|2|/|L|i|b|/|t|e|s|t|/|t|e|s|t|_|f|s|t|r|i|n|g|.|p|y| |(|r|e|f|o|r|m|a|t@1|e|d| |f|o|r| |s|y|n|t|a|x| |t|e|s|t|i|n|g|)| +0#0000000&@1
+@75
+|#+0#0000e05&@1| |t|e|s|t|_|a|s|t| +0#0000000&@63
+|f+0#e000002&|'|{+0#e000e06&|a+0#0000000&| |*| |x|(|)|}+0#e000e06&|'+0#e000002&| +0#0000000&@62
+@75
+|#+0#0000e05&@1| |t|e|s|t|_|a|s|t|_|l|i|n|e|_|n|u|m|b|e|r|s|_|m|u|l|t|i|p|l|e|_|f|o|r|m|a|t@1|e|d|v|a|l|u|e|s| +0#0000000&@25
+|f+0#e000002&|'|n|o| |f|o|r|m|a|t@1|e|d| |v|a|l|u|e|s|'| +0#0000000&@52
+|f+0#e000002&|'|e|g@1|s| |{+0#e000e06&|a+0#0000000&| |*| |x|(|)|}+0#e000e06&| +0#e000002&|s|p|a|m| |{+0#e000e06&|b+0#0000000&| |+| |y|(|)|}+0#e000e06&|'+0#e000002&| +0#0000000&@42
+@75
+|#+0#0000e05&@1| |t|e|s|t|_|a|s|t|_|l|i|n|e|_|n|u|m|b|e|r|s|_|n|e|s|t|e|d| +0#0000000&@43
+|f+0#e000002&|'|{+0#e000e06&|a+0#0000000&| |*| |f+0#e000002&|"|-|{+0#e000e06&|x+0#0000000&|(|)|}+0#e000e06&|-+0#e000002&|"|}+0#e000e06&|'+0#e000002&| +0#0000000&@55
+@75
+|#+0#0000e05&@1| |t|e|s|t|_|a|s|t|_|l|i|n|e|_|n|u|m|b|e|r|s|_|d|u|p|l|i|c|a|t|e|_|e|x|p|r|e|s@1|i|o|n| +0#0000000&@29
+|f+0#e000002&|'|{+0#e000e06&|a+0#0000000&| |*| |x|(|)|}+0#e000e06&| +0#e000002&|{+0#e000e06&|a+0#0000000&| |*| |x|(|)|}+0#e000e06&| +0#e000002&|{+0#e000e06&|a+0#0000000&| |*| |x|(|)|}+0#e000e06&|'+0#e000002&| +0#0000000&@42
+@75
+|#+0#0000e05&@1| |t|e|s|t|_|a|s|t|_|n|u|m|b|e|r|s|_|f|s|t|r|i|n|g|_|w|i|t|h|_|f|o|r|m|a|t@1|i|n|g| +0#0000000&@31
+|'+0#e000002&|f|"|H|e|r|e| |i|s| |t|h|a|t| |p|e|s|k|y| |{|x@2|:|.|3|f|}| |a|g|a|i|n|"|'| +0#0000000&@35
+|"|i|n|p|u|t|/|p|y|t|h|o|n|_|f|s|t|r|i|n|g|.|p|y|"| |6|1|3|L|,| |1|3|0|2|4|B| @18|1|,|1| @10|T|o|p| 

runtime/syntax/testdir/dumps/python_fstring_01.dump

@@ -0,0 +1,20 @@
+| +0&#ffffff0@74
+|#+0#0000e05&@1| |t|e|s|t|_|a|s|t|_|l|i|n|e|_|n|u|m|b|e|r|s|_|d|u|p|l|i|c|a|t|e|_|e|x|p|r|e|s@1|i|o|n| +0#0000000&@29
+|f+0#e000002&|'|{+0#e000e06&|a+0#0000000&| |*| |x|(|)|}+0#e000e06&| +0#e000002&|{+0#e000e06&|a+0#0000000&| |*| |x|(|)|}+0#e000e06&| +0#e000002&|{+0#e000e06&|a+0#0000000&| |*| |x|(|)|}+0#e000e06&|'+0#e000002&| +0#0000000&@42
+@75
+|#+0#0000e05&@1| |t|e|s|t|_|a|s|t|_|n|u|m|b|e|r|s|_|f|s|t|r|i|n|g|_|w|i|t|h|_|f|o|r|m|a|t@1|i|n|g| +0#0000000&@31
+>'+0#e000002&|f|"|H|e|r|e| |i|s| |t|h|a|t| |p|e|s|k|y| |{|x@2|:|.|3|f|}| |a|g|a|i|n|"|'| +0#0000000&@35
+@75
+|#+0#0000e05&@1| |t|e|s|t|_|a|s|t|_|l|i|n|e|_|n|u|m|b|e|r|s|_|m|u|l|t|i|l|i|n|e|_|f|s|t|r|i|n|g| +0#0000000&@32
+|f+0#e000002&|'@2| +0#0000000&@70
+| +0#e000002&@1|{+0#e000e06&|a+0#0000000&| @70
+@5|*| @68
+@7|x|(|)|}+0#e000e06&| +0#0000000&@63
+|n+0#e000002&|o|n|-|i|m|p|o|r|t|a|n|t| |c|o|n|t|e|n|t| +0#0000000&@53
+|'+0#e000002&@2| +0#0000000&@71
+@75
+|f+0#e000002&|'@2| +0#0000000&@70
+| +0#e000002&@9|{+0#e000e06&|b+0#0000000&|l|e|c|h|}+0#e000e06&| +0#0000000&@57
+|'+0#e000002&@2| +0#0000000&@71
+@75
+@57|1|9|,|1| @10|2|%| 

runtime/syntax/testdir/dumps/python_fstring_02.dump

@@ -0,0 +1,20 @@
+| +0&#ffffff0@74
+|#+0#0000e05&@1| |t|e|s|t|_|a|s|t|_|l|i|n|e|_|n|u|m|b|e|r|s|_|w|i|t|h|_|p|a|r|e|n|t|h|e|s|e|s| +0#0000000&@33
+|x| |=| |(| @69
+@4|f+0#e000002&|"| |{+0#e000e06&|t+0#0000000&|e|s|t|(|t|)|}+0#e000e06&|"+0#e000002&| +0#0000000&@57
+|)| @73
+> @74
+|x| |=| |(| @69
+@4|u+0#e000002&|'|w|a|t|'|,+0#0000000&| @63
+@4|u+0#e000002&|"|w|a|t|"|,+0#0000000&| @63
+@4|b+0#e000002&|'|w|a|t|'|,+0#0000000&| @63
+@4|b+0#e000002&|"|w|a|t|"|,+0#0000000&| @63
+@4|f+0#e000002&|'|w|a|t|'|,+0#0000000&| @63
+@4|f+0#e000002&|"|w|a|t|"|,+0#0000000&| @63
+|)| @73
+@75
+|y| |=| |(| @69
+@4|u+0#e000002&|'@2|w|a|t|'@2|,+0#0000000&| @59
+@4|u+0#e000002&|"@2|w|a|t|"@2|,+0#0000000&| @59
+@4|b+0#e000002&|'@2|w|a|t|'@2|,+0#0000000&| @59
+@57|3|7|,|0|-|1| @8|5|%| 

runtime/syntax/testdir/dumps/python_fstring_03.dump

@@ -0,0 +1,20 @@
+| +0&#ffffff0@3|b+0#e000002&|'@2|w|a|t|'@2|,+0#0000000&| @59
+@4|b+0#e000002&|"@2|w|a|t|"@2|,+0#0000000&| @59
+@4|f+0#e000002&|'@2|w|a|t|'@2|,+0#0000000&| @59
+@4|f+0#e000002&|"@2|w|a|t|"@2|,+0#0000000&| @59
+|)| @73
+> @74
+|x| |=| |(| @69
+@8|'+0#e000002&|P|E|R|L|_|M@1|_|O|P|T|'|,+0#0000000&| |(| @50
+@12|f+0#e000002&|'|w|a|t|'| +0#0000000&@56
+@12|f+0#e000002&|'|s|o|m|e|_|s|t|r|i|n|g|=|{+0#e000e06&|f+0#0000000&|(|x|)|}+0#e000e06&| +0#e000002&|'| +0#0000000&@40
+@12|f+0#e000002&|'|w|a|t|'| +0#0000000&@56
+@8|)|,| @64
+|)| @73
+@75
+|#+0#0000e05&@1| |t|e|s|t|_|a|s|t|_|f|s|t|r|i|n|g|_|e|m|p|t|y|_|f|o|r|m|a|t|_|s|p|e|c| +0#0000000&@37
+|f+0#e000002&|'|{+0#e000e06&|e+0#0000000&|x|p|r|:+0#e000e06&|}|'+0#e000002&| +0#0000000&@64
+@75
+@75
+|#+0#0000e05&@1| |t|e|s|t|_|d|o|c|s|t|r|i|n|g| +0#0000000&@57
+@57|5@1|,|0|-|1| @8|8|%| 

runtime/syntax/testdir/dumps/python_fstring_04.dump

@@ -0,0 +1,20 @@
+|#+0#0000e05#ffffff0@1| |t|e|s|t|_|d|o|c|s|t|r|i|n|g| +0#0000000&@57
+|d+0#af5f00255&|e|f| +0#0000000&|f+0#00e0e07&|(+0#0000000&|)|:| @66
+@4|f+0#e000002&|'@2|N|o|t| |a| |d|o|c|s|t|r|i|n|g|'@2| +0#0000000&@48
+@75
+|d+0#af5f00255&|e|f| +0#0000000&|g+0#00e0e07&|(+0#0000000&|)|:| @66
+@4>'+0#e000002&@2|N|o|t| |a| |d|o|c|s|t|r|i|n|g|'@2| +0#0000000&|\+0#e000e06&| +0#0000000&@47
+@4|f+0#e000002&|'@1| +0#0000000&@67
+@75
+@75
+|#+0#0000e05&@1| |t|e|s|t|_|a|s|t|_|c|o|m|p|i|l|e|_|t|i|m|e|_|c|o|n|c|a|t| +0#0000000&@43
+|(|'+0#e000002&|f|o@1|'| +0#0000000&|f+0#e000002&|'|{+0#e000e06&|3+0#e000002&|}+0#e000e06&|'+0#e000002&|,+0#0000000&| |'+0#e000002&|f|o@1|3|'|)+0#0000000&| @52
+@75
+|#+0#0000e05&@1| |t|e|s|t|_|l|i|t|e|r|a|l| +0#0000000&@59
+|(|f+0#e000002&|'@1|,+0#0000000&| |'+0#e000002&@1|)+0#0000000&| @65
+|(|f+0#e000002&|'|a|'|,+0#0000000&| |'+0#e000002&|a|'|)+0#0000000&| @63
+|(|f+0#e000002&|'| |'|,+0#0000000&| |'+0#e000002&| |'|)+0#0000000&| @63
+@75
+|#+0#0000e05&@1| |t|e|s|t|_|d|o|u|b|l|e|_|b|r|a|c|e|s| +0#0000000&@53
+|(|f+0#e000002&|'|{+0#e000e06&@1|'+0#e000002&|,+0#0000000&| |'+0#e000002&|{|'|)+0#0000000&| @62
+@57|7|3|,|5| @9|1@1|%| 

runtime/syntax/testdir/dumps/python_fstring_05.dump

@@ -0,0 +1,20 @@
+|(+0&#ffffff0|f+0#e000002&|'|{+0#e000e06&@1|'+0#e000002&|,+0#0000000&| |'+0#e000002&|{|'|)+0#0000000&| @62
+|(|f+0#e000002&|'|a|{+0#e000e06&@1|'+0#e000002&|,+0#0000000&| |'+0#e000002&|a|{|'|)+0#0000000&| @60
+|(|f+0#e000002&|'|{+0#e000e06&@1|b+0#e000002&|'|,+0#0000000&| |'+0#e000002&|{|b|'|)+0#0000000&| @60
+|(|f+0#e000002&|'|a|{+0#e000e06&@1|b+0#e000002&|'|,+0#0000000&| |'+0#e000002&|a|{|b|'|)+0#0000000&| @58
+|(|f+0#e000002&|'|}+0#e000e06&@1|'+0#e000002&|,+0#0000000&| |'+0#e000002&|}|'|)+0#0000000&| @62
+>(|f+0#e000002&|'|a|}+0#e000e06&@1|'+0#e000002&|,+0#0000000&| |'+0#e000002&|a|}|'|)+0#0000000&| @60
+|(|f+0#e000002&|'|}+0#e000e06&@1|b+0#e000002&|'|,+0#0000000&| |'+0#e000002&|}|b|'|)+0#0000000&| @60
+|(|f+0#e000002&|'|a|}+0#e000e06&@1|b+0#e000002&|'|,+0#0000000&| |'+0#e000002&|a|}|b|'|)+0#0000000&| @58
+|(|f+0#e000002&|'|{+0#e000e06&@1|}@1|'+0#e000002&|,+0#0000000&| |'+0#e000002&|{|}|'|)+0#0000000&| @59
+|(|f+0#e000002&|'|a|{+0#e000e06&@1|}@1|'+0#e000002&|,+0#0000000&| |'+0#e000002&|a|{|}|'|)+0#0000000&| @57
+|(|f+0#e000002&|'|{+0#e000e06&@1|b+0#e000002&|}+0#e000e06&@1|'+0#e000002&|,+0#0000000&| |'+0#e000002&|{|b|}|'|)+0#0000000&| @57
+|(|f+0#e000002&|'|{+0#e000e06&@1|}@1|c+0#e000002&|'|,+0#0000000&| |'+0#e000002&|{|}|c|'|)+0#0000000&| @57
+|(|f+0#e000002&|'|a|{+0#e000e06&@1|b+0#e000002&|}+0#e000e06&@1|'+0#e000002&|,+0#0000000&| |'+0#e000002&|a|{|b|}|'|)+0#0000000&| @55
+|(|f+0#e000002&|'|a|{+0#e000e06&@1|}@1|c+0#e000002&|'|,+0#0000000&| |'+0#e000002&|a|{|}|c|'|)+0#0000000&| @55
+|(|f+0#e000002&|'|{+0#e000e06&@1|b+0#e000002&|}+0#e000e06&@1|c+0#e000002&|'|,+0#0000000&| |'+0#e000002&|{|b|}|c|'|)+0#0000000&| @55
+|(|f+0#e000002&|'|a|{+0#e000e06&@1|b+0#e000002&|}+0#e000e06&@1|c+0#e000002&|'|,+0#0000000&| |'+0#e000002&|a|{|b|}|c|'|)+0#0000000&| @53
+@75
+|(|f+0#e000002&|'|{+0#e000e06&@2|1+0#e000002&|0|}+0#e000e06&|'+0#e000002&|,+0#0000000&| |'+0#e000002&|{|1|0|'|)+0#0000000&| @56
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runtime/syntax/testdir/dumps/python_fstring_06.dump

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