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require 'rack/mount/utils'
module Rack::Mount
module Analysis
class Splitting < Frequency
NULL = "\0".freeze
class Key < Struct.new(:method, :index, :separators)
def self.split(value, separator_pattern)
keys = value.split(separator_pattern)
keys.shift if keys[0] == ''
keys << NULL
keys
end
def call(cache, obj)
(cache[method] ||= self.class.split(obj.send(method), separators))[index]
end
def call_source(cache, obj)
"(#{cache}[:#{method}] ||= Analysis::Splitting::Key.split(#{obj}.#{method}, #{separators.inspect}))[#{index}]"
end
def inspect
"#{method}[#{index}]"
end
end
def clear
@boundaries = {}
super
end
def <<(key)
super
key.each_pair do |k, v|
analyze_capture_boundaries(v, @boundaries[k] ||= Histogram.new)
end
end
def separators(key)
(@boundaries[key].keys_in_upper_quartile + ['/']).uniq
end
def process_key(requirements, method, requirement)
separators = separators(method)
if requirement.is_a?(Regexp) && separators.any?
generate_split_keys(requirement, separators).each_with_index do |value, index|
requirements[Key.new(method, index, Regexp.union(*separators))] = value
end
else
super
end
end
private
def analyze_capture_boundaries(regexp, boundaries) #:nodoc:
return boundaries unless regexp.is_a?(Regexp)
parts = Utils.parse_regexp(regexp)
parts.each_with_index do |part, index|
if part.is_a?(Regin::Group)
if index > 0
previous = parts[index-1]
if previous.is_a?(Regin::Character) && previous.literal?
boundaries << previous.to_s
end
end
if inside = part.expression[0]
if inside.is_a?(Regin::Character) && inside.literal?
boundaries << inside.to_s
end
end
if index < parts.length
following = parts[index+1]
if following.is_a?(Regin::Character) && following.literal?
boundaries << following.to_s
end
end
end
end
boundaries
end
def generate_split_keys(regexp, separators) #:nodoc:
segments = []
buf = nil
parts = Utils.parse_regexp(regexp)
parts.each_with_index do |part, index|
case part
when Regin::Anchor
if part.value == '$' || part.value == '\Z'
segments << join_buffer(buf, regexp) if buf
segments << NULL
buf = nil
break
end
when Regin::CharacterClass
break if separators.any? { |s| part.include?(s) }
buf = nil
segments << part.to_regexp(true)
when Regin::Character
if separators.any? { |s| part.include?(s) }
segments << join_buffer(buf, regexp) if buf
peek = parts[index+1]
if peek.is_a?(Regin::Character) && separators.include?(peek.value)
segments << ''
end
buf = nil
else
buf ||= Regin::Expression.new([])
buf += [part]
end
when Regin::Group
if part.quantifier == '?'
value = part.expression.first
if separators.any? { |s| value.include?(s) }
segments << join_buffer(buf, regexp) if buf
buf = nil
end
break
elsif part.quantifier == nil
break if separators.any? { |s| part.include?(s) }
buf = nil
segments << part.to_regexp(true)
else
break
end
else
break
end
if index + 1 == parts.size
segments << join_buffer(buf, regexp) if buf
buf = nil
break
end
end
while segments.length > 0 && (segments.last.nil? || segments.last == '')
segments.pop
end
segments
end
def join_buffer(parts, regexp)
if parts.literal?
parts.to_s
else
parts.to_regexp(true)
end
end
end
end
end
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