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# The skipper is a crucial sub-pattern
# that is activated by any whitespace in the
# grammar file
skipper = \b([\ \t\n\r\b]|\#[^\n]*|\\[\r\n])*
any = [^]
keywords = \b(?i:script|lang|provides|requires|optional)\b
name = (?!{-keywords})(?i:[a-z_][a-z0-9_\.]*\b)
num = [+\-]?[0-9]+
script = (?i: script( {name}|))
lang = (?i: lang( {name}|))
option = {name}
provides = (?i:
provides {name} \{
({script}?
{lang}
( options {option}( {option})* |)|)
\}
)
requires = (?i:
requires (thorns:|) {name}([ \t]*{name})*
)
ifactive = (?i:_ifactive)
optional = (?i:
optional{ifactive}? {name}([ \t]+{name})* \{ ( {name} )* \}
)
config = ({provides} |{requires} |{optional} )* $
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