CMake ABNF grammar

CMake.abnf

; CMake list file grammar

newline            = CR / LF / CRLF
whitespace         = SP / HTAB / newline
comment            = "#" *CHAR newline
wspc = whitespace / comment

identifier         = ( ALPHA / "_" ) 1*( ALPHA / DIGIT / "_" )

escape-char        = "\\" ( "\\" / DQUOTE / SP / "#" / "(" / ")" / "$" / "@" / "^" / ";" / "t" / "n" / "r" / "0" )
string-char        = <CHAR excluding '"' and '\'>
quoted-argument    = DQUOTE *(string-char / escape-char) DQUOTE

variable           = "$" "(" *( ALPHA / DIGIT / "_" ) ")"
unquoted-argument'  = (variable / <CHAR excluding SP HTAB CR LF "(" ")" "#" "\\" DQUOTE> / escape-char ) 
                     *(variable / <CHAR excluding SP HTAB CR LF "(" ")" "#" "\\" DQUOTE> / escape-char /
                       DQUOTE *( variable / <CHAR excluding CR LF "(" ")" "#" "\\" DQUOTE> / escape-char ) DQUOTE)
unquoted-argument = unquoted-argument' / identifier

bracketed-argument = "(" *wspc *argument ")"
argument = (bracketed-argument / unquoted-argument / quoted-argument) *wspc

function = identifier *wspc "(" *wspc *argument ")" ( *(SP / HTAB) (newline / <EOF>))


; Experimental CMake argument grammar

Start = (String cal_BSLASH) / String

String = Variable / OuterText

name = 1*(ALPHA / DIGIT / "/" / "_" / "." / "+" / "-")
symbol = 1*<CHAR excluding "$" "{" "}" "\\" "@">

OuterText = cal_name / "@" / "$" / "{" / "}" / symbol

env-curly = "$" "E" "N" "V" "{" EnvVarName "}"
ncurly = "$" name "{" MultipleIds "}"
dcurly = "$" "{" MultipleIds "}"
atname = "@" name "@"

Variable = env-curly / ncurly / dcurly / atname
EnvVarName = MultipleIds / (symbol EnvVarName)
MultipleIds = *(name / Variable)