[英]PEG grammar to parse optional content
您想使用“可选表达式”(请参阅本页约60%):
grammar Sokmesa
rule line
"system" wsp+ marker wsp+ (category wsp+)? attributelist
end
rule category
"AAA1" # Or whatever
end
# Add rules for 'marker', 'wsp', and 'attributelist' here
end
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