---input---
// JSON-LD keywords
{"@base": ""}
{"@container": ""}
{"@context": ""}
{"@direction": ""}
{"@graph": ""}
{"@id": ""}
{"@import": ""}
{"@included": ""}
{"@index": ""}
{"@json": ""}
{"@language": ""}
{"@list": ""}
{"@nest": ""}
{"@none": ""}
{"@prefix": ""}
{"@propagate": ""}
{"@protected": ""}
{"@reverse": ""}
{"@set": ""}
{"@type": ""}
{"@value": ""}
{"@version": ""}
{"@vocab": ""}

// Not keywords
{"@bogus": ""} // "@" does not guarantee a keyword match
{"@bases": ""} // keyword is "base"
{"container": ""} // no leading "@"

---tokens---
'// JSON-LD keywords' Comment.Single
'\n'          Text.Whitespace

'{'           Punctuation
'"@base"'     Name.Decorator
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
'\n'          Text.Whitespace

'{'           Punctuation
'"@container"' Name.Decorator
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
'\n'          Text.Whitespace

'{'           Punctuation
'"@context"'  Name.Decorator
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
'\n'          Text.Whitespace

'{'           Punctuation
'"@direction"' Name.Decorator
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
'\n'          Text.Whitespace

'{'           Punctuation
'"@graph"'    Name.Decorator
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
'\n'          Text.Whitespace

'{'           Punctuation
'"@id"'       Name.Decorator
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
'\n'          Text.Whitespace

'{'           Punctuation
'"@import"'   Name.Decorator
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
'\n'          Text.Whitespace

'{'           Punctuation
'"@included"' Name.Decorator
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
'\n'          Text.Whitespace

'{'           Punctuation
'"@index"'    Name.Decorator
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
'\n'          Text.Whitespace

'{'           Punctuation
'"@json"'     Name.Decorator
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
'\n'          Text.Whitespace

'{'           Punctuation
'"@language"' Name.Decorator
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
'\n'          Text.Whitespace

'{'           Punctuation
'"@list"'     Name.Decorator
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
'\n'          Text.Whitespace

'{'           Punctuation
'"@nest"'     Name.Decorator
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
'\n'          Text.Whitespace

'{'           Punctuation
'"@none"'     Name.Decorator
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
'\n'          Text.Whitespace

'{'           Punctuation
'"@prefix"'   Name.Decorator
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
'\n'          Text.Whitespace

'{'           Punctuation
'"@propagate"' Name.Decorator
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
'\n'          Text.Whitespace

'{'           Punctuation
'"@protected"' Name.Decorator
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
'\n'          Text.Whitespace

'{'           Punctuation
'"@reverse"'  Name.Decorator
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
'\n'          Text.Whitespace

'{'           Punctuation
'"@set"'      Name.Decorator
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
'\n'          Text.Whitespace

'{'           Punctuation
'"@type"'     Name.Decorator
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
'\n'          Text.Whitespace

'{'           Punctuation
'"@value"'    Name.Decorator
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
'\n'          Text.Whitespace

'{'           Punctuation
'"@version"'  Name.Decorator
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
'\n'          Text.Whitespace

'{'           Punctuation
'"@vocab"'    Name.Decorator
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
'\n\n'        Text.Whitespace

'// Not keywords' Comment.Single
'\n'          Text.Whitespace

'{'           Punctuation
'"@bogus"'    Name.Tag
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
' '           Text.Whitespace
'// "@" does not guarantee a keyword match' Comment.Single
'\n'          Text.Whitespace

'{'           Punctuation
'"@bases"'    Name.Tag
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
' '           Text.Whitespace
'// keyword is "base"' Comment.Single
'\n'          Text.Whitespace

'{'           Punctuation
'"container"' Name.Tag
':'           Punctuation
' '           Text.Whitespace
'""'          Literal.String.Double
'}'           Punctuation
' '           Text.Whitespace
'// no leading "@"' Comment.Single
'\n'          Text.Whitespace