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# File 'lib/protocol/caldav/ical/parser.rb', line 11
def parse(text)
if text.nil? || text.strip.empty?
nil
else
text = text.sub(/\A\xEF\xBB\xBF/, '')
lines = ContentLine.unfold(text).split("\n").map(&:strip).reject(&:empty?)
stack = []
current = nil
lines.each do |line|
parsed = ContentLine.parse_line(line)
unless parsed
next
end
name, params, value = parsed
if name.casecmp?('BEGIN')
comp = Component.new(name: value.strip.upcase)
if current
stack.push(current)
end
current = comp
elsif name.casecmp?('END')
end_name = value.strip.upcase
if current.nil? || !current.name.casecmp?(end_name)
raise ParseError, "Mismatched END:#{end_name} (expected END:#{current&.name})"
end
if stack.empty?
break
else
parent = stack.pop
parent.components << current
current = parent
end
else
current&.properties&.push(Property.new(name: name, params: params, value: value))
end
end
if current && stack.any?
raise ParseError, "Unclosed component: #{current&.name}"
end
current
end
end
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