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module Chronic
class Handler
attr_reader :pattern
attr_reader :handler_method
# pattern - An Array of patterns to match tokens against.
# handler_method - A Symbol representing the method to be invoked
# when a pattern matches.
def initialize(pattern, handler_method)
@pattern = pattern
@handler_method = handler_method
end
# tokens - An Array of tokens to process.
# definitions - A Hash of definitions to check against.
#
# Returns true if a match is found.
def match(tokens, definitions)
token_index = 0
@pattern.each do |elements|
was_optional = false
elements = [elements] unless elements.is_a?(Array)
elements.each_index do |i|
name = elements[i].to_s
optional = name[-1, 1] == '?'
name = name.chop if optional
case elements[i]
when Symbol
if tags_match?(name, tokens, token_index)
token_index += 1
break
else
if optional
was_optional = true
next
elsif i + 1 < elements.count
next
else
return false unless was_optional
end
end
when String
return true if optional && token_index == tokens.size
if definitions.key?(name.to_sym)
sub_handlers = definitions[name.to_sym]
else
raise "Invalid subset #{name} specified"
end
sub_handlers.each do |sub_handler|
return true if sub_handler.match(tokens[token_index..tokens.size], definitions)
end
else
raise "Invalid match type: #{elements[i].class}"
end
end
end
return false if token_index != tokens.size
return true
end
def invoke(type, tokens, parser, options)
if Chronic.debug
puts "-#{type}"
puts "Handler: #{@handler_method}"
end
parser.send(@handler_method, tokens, options)
end
# other - The other Handler object to compare.
#
# Returns true if these Handlers match.
def ==(other)
@pattern == other.pattern
end
private
def tags_match?(name, tokens, token_index)
klass = Chronic.const_get(name.to_s.gsub(/(?:^|_)(.)/) { $1.upcase })
if tokens[token_index]
!tokens[token_index].tags.select { |o| o.kind_of?(klass) }.empty?
end
end
end
end
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