Class: LooseTightDictionary
- Inherits:
-
Object
- Object
- LooseTightDictionary
- Defined in:
- lib/loose_tight_dictionary.rb,
lib/loose_tight_dictionary/score.rb,
lib/loose_tight_dictionary/result.rb,
lib/loose_tight_dictionary/version.rb,
lib/loose_tight_dictionary/wrapper.rb,
lib/loose_tight_dictionary/blocking.rb,
lib/loose_tight_dictionary/identity.rb,
lib/loose_tight_dictionary/tightener.rb,
lib/loose_tight_dictionary/similarity.rb,
lib/loose_tight_dictionary/cached_result.rb
Overview
See the README for more information.
Defined Under Namespace
Classes: Blocking, CachedResult, Identity, Result, Score, Similarity, Tightener, Wrapper
Constant Summary collapse
- VERSION =
'1.0.2'
Instance Attribute Summary collapse
-
#haystack ⇒ Object
readonly
Returns the value of attribute haystack.
-
#options ⇒ Object
readonly
Returns the value of attribute options.
-
#records ⇒ Object
readonly
Returns the value of attribute records.
Instance Method Summary collapse
- #blockings ⇒ Object
-
#explain(needle) ⇒ Object
Explain is like mysql’s EXPLAIN command.
- #find(needle, options = {}) ⇒ Object
- #find_all(needle, options = {}) ⇒ Object
- #first_blocking_decides ⇒ Object
- #free ⇒ Object
- #freed? ⇒ Boolean
- #identities ⇒ Object
-
#initialize(records, options = {}) ⇒ LooseTightDictionary
constructor
haystack - a bunch of records options * tighteners: regexps (see readme) * identities: regexps * blockings: regexps * read: how to interpret each entry in the ‘haystack’, either a Proc or a symbol.
- #last_result ⇒ Object
-
#log(str = '') ⇒ Object
:nodoc:.
- #must_match_blocking ⇒ Object
- #tighteners ⇒ Object
Constructor Details
#initialize(records, options = {}) ⇒ LooseTightDictionary
haystack - a bunch of records options
-
tighteners: regexps (see readme)
-
identities: regexps
-
blockings: regexps
-
read: how to interpret each entry in the ‘haystack’, either a Proc or a symbol
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# File 'lib/loose_tight_dictionary.rb', line 29 def initialize(records, = {}) @options = .symbolize_keys @records = records read = [:read] || [:haystack_reader] @haystack = records.map { |record| Wrapper.new self, record, read } end |
Instance Attribute Details
#haystack ⇒ Object (readonly)
Returns the value of attribute haystack.
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# File 'lib/loose_tight_dictionary.rb', line 20 def haystack @haystack end |
#options ⇒ Object (readonly)
Returns the value of attribute options.
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# File 'lib/loose_tight_dictionary.rb', line 19 def @options end |
#records ⇒ Object (readonly)
Returns the value of attribute records.
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# File 'lib/loose_tight_dictionary.rb', line 21 def records @records end |
Instance Method Details
#blockings ⇒ Object
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# File 'lib/loose_tight_dictionary.rb', line 214 def blockings @blockings ||= ([:blockings] || []).map do |regexp_or_str| Blocking.new regexp_or_str end end |
#explain(needle) ⇒ Object
Explain is like mysql’s EXPLAIN command. You give it a needle and it tells you about how it was located (successfully or not) in the haystack.
d = LooseTightDictionary.new ['737', '747', '757' ]
d.explain 'boeing 737-100'
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# File 'lib/loose_tight_dictionary.rb', line 143 def explain(needle) record = find needle, :gather_last_result => true log "#" * 150 log "# Match #{needle.inspect} => #{record.inspect}" log "#" * 150 log log "Needle" log "-" * 150 log last_result.needle.to_str log log "Haystack" log "-" * 150 log last_result.haystack.map { |record| record.to_str }.join("\n") log log "Tighteners" log "-" * 150 log last_result.tighteners.blank? ? '(none)' : last_result.tighteners.map { |tightener| tightener.inspect }.join("\n") log log "Blockings" log "-" * 150 log last_result.blockings.blank? ? '(none)' : last_result.blockings.map { |blocking| blocking.inspect }.join("\n") log log "Identities" log "-" * 150 log last_result.identities.blank? ? '(none)' : last_result.identities.map { |blocking| blocking.inspect }.join("\n") log log "Joint" log "-" * 150 log last_result.joint.blank? ? '(none)' : last_result.joint.map { |joint| joint.to_str }.join("\n") log log "Disjoint" log "-" * 150 log last_result.disjoint.blank? ? '(none)' : last_result.disjoint.map { |disjoint| disjoint.to_str }.join("\n") log log "Possibly identical" log "-" * 150 log last_result.possibly_identical.blank? ? '(none)' : last_result.possibly_identical.map { |possibly_identical| possibly_identical.to_str }.join("\n") log log "Certainly different" log "-" * 150 log last_result.certainly_different.blank? ? '(none)' : last_result.certainly_different.map { |certainly_different| certainly_different.to_str }.join("\n") log log "Similarities" log "-" * 150 log last_result.similarities.blank? ? '(none)' : last_result.similarities.reverse[0..9].map { |similarity| similarity.inspect }.join("\n") log log "Match" log "-" * 150 log record.inspect end |
#find(needle, options = {}) ⇒ Object
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# File 'lib/loose_tight_dictionary.rb', line 49 def find(needle, = {}) raise ::RuntimeError, "[loose_tight_dictionary] Dictionary has already been freed, can't perform more finds" if freed? = .symbolize_keys if gather_last_result = .fetch(:gather_last_result, false) free_last_result @last_result = Result.new end find_all = .fetch(:find_all, false) if gather_last_result last_result.tighteners = tighteners last_result.identities = identities last_result.blockings = blockings end needle = Wrapper.new self, needle if gather_last_result last_result.needle = needle end if must_match_blocking and blockings.any? and blockings.none? { |blocking| blocking.match? needle } if find_all return [] else return nil end end joint, disjoint = if blockings.any? haystack.partition do |straw| if first_blocking_decides blockings.detect { |blocking| blocking.match? needle }.try :join?, needle, straw else blockings.any? { |blocking| blocking.join? needle, straw } end end else [ haystack.dup, [] ] end # special case: the needle didn't fit anywhere, but must_match_blocking is false, so we'll try it against everything if joint.none? joint = disjoint disjoint = [] end if gather_last_result last_result.joint = joint last_result.disjoint = disjoint end possibly_identical, certainly_different = if identities.any? joint.partition do |straw| identities.all? do |identity| answer = identity.identical? needle, straw answer.nil? or answer == true end end else [ joint.dup, [] ] end if gather_last_result last_result.possibly_identical = possibly_identical last_result.certainly_different = certainly_different end if find_all return possibly_identical.map { |straw| straw.record } end similarities = possibly_identical.map { |straw| needle.similarity straw }.sort if gather_last_result last_result.similarities = similarities end if best_similarity = similarities[-1] and best_similarity.best_score.to_f > 0 record = best_similarity.wrapper2.record if gather_last_result last_result.record = record last_result.score = best_similarity.best_score.to_f end record end end |
#find_all(needle, options = {}) ⇒ Object
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# File 'lib/loose_tight_dictionary.rb', line 44 def find_all(needle, = {}) = .symbolize_keys.merge(:find_all => true) find needle, end |
#first_blocking_decides ⇒ Object
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# File 'lib/loose_tight_dictionary.rb', line 198 def first_blocking_decides .fetch :first_blocking_decides, false end |
#free ⇒ Object
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# File 'lib/loose_tight_dictionary.rb', line 224 def free free_last_result @options.try :clear @options = nil @haystack.try :clear @haystack = nil @tighteners.try :clear @tighteners = nil @identities.try :clear @identities = nil @blockings.try :clear @blockings = nil ensure @freed = true end |
#freed? ⇒ Boolean
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# File 'lib/loose_tight_dictionary.rb', line 220 def freed? @freed == true end |
#identities ⇒ Object
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# File 'lib/loose_tight_dictionary.rb', line 208 def identities @identities ||= ([:identities] || []).map do |regexp_or_str| Identity.new regexp_or_str end end |
#last_result ⇒ Object
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# File 'lib/loose_tight_dictionary.rb', line 36 def last_result @last_result || raise(::RuntimeError, "[loose_tight_dictionary] You can't access the last result until you've run a find with :gather_last_result => true") end |
#log(str = '') ⇒ Object
:nodoc:
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# File 'lib/loose_tight_dictionary.rb', line 40 def log(str = '') #:nodoc: ([:log] || $stderr).puts str unless [:log] == false end |
#must_match_blocking ⇒ Object
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# File 'lib/loose_tight_dictionary.rb', line 194 def must_match_blocking .fetch :must_match_blocking, false end |