Sync did_you_mean again

lib/did_you_mean.rb

@@ -7,7 +7,8 @@ require_relative 'did_you_mean/spell_checkers/method_name_checker'
 require_relative 'did_you_mean/spell_checkers/key_error_checker'
 require_relative 'did_you_mean/spell_checkers/null_checker'
 require_relative 'did_you_mean/spell_checkers/require_path_checker'
-require_relative 'did_you_mean/formatters/plain_formatter'
+require_relative 'did_you_mean/spell_checkers/pattern_key_name_checker'
+require_relative 'did_you_mean/formatter'
 require_relative 'did_you_mean/tree_spell_checker'
 
 # The +DidYouMean+ gem adds functionality to suggest possible method/class
@@ -97,16 +98,17 @@ module DidYouMean
   correct_error KeyError, KeyErrorChecker
   correct_error NoMethodError, MethodNameChecker
   correct_error LoadError, RequirePathChecker if RUBY_VERSION >= '2.8.0'
+  correct_error NoMatchingPatternKeyError, PatternKeyNameChecker if defined?(::NoMatchingPatternKeyError)
 
   # Returns the currently set formatter. By default, it is set to +DidYouMean::Formatter+.
   def self.formatter
-    @@formatter
+    @formatter
   end
 
   # Updates the primary formatter used to format the suggestions.
-  def self.formatter=(formatter)
-    @@formatter = formatter
+  def self.formatter=(*)
+    @formatter = formatter
   end
 
-  self.formatter = PlainFormatter.new
+  @formatter = Formatter.new
 end

lib/did_you_mean/formatter.rb

@@ -0,0 +1,35 @@
+# frozen-string-literal: true
+
+module DidYouMean
+  # The +DidYouMean::Formatter+ is the basic, default formatter for the
+  # gem. The formatter responds to the +message_for+ method and it returns a
+  # human readable string.
+  class Formatter
+
+    # Returns a human readable string that contains +corrections+. This
+    # formatter is designed to be less verbose to not take too much screen
+    # space while being helpful enough to the user.
+    #
+    # @example
+    #
+    #   formatter = DidYouMean::Formatter.new
+    #
+    #   # displays suggestions in two lines with the leading empty line
+    #   puts formatter.message_for(["methods", "method"])
+    #
+    #   Did you mean?  methods
+    #                   method
+    #   # => nil
+    #
+    #   # displays an empty line
+    #   puts formatter.message_for([])
+    #
+    #   # => nil
+    #
+    def message_for(corrections)
+      corrections.empty? ? "" : "\nDid you mean?  #{corrections.join("\n               ")}"
+    end
+  end
+
+  PlainFormatter = Formatter
+end

lib/did_you_mean/formatters/plain_formatter.rb

@@ -1,33 +1,4 @@
-# frozen-string-literal: true
+require_relative '../formatter'
 
-module DidYouMean
-  # The +DidYouMean::PlainFormatter+ is the basic, default formatter for the
-  # gem. The formatter responds to the +message_for+ method and it returns a
-  # human readable string.
-  class PlainFormatter
-
-    # Returns a human readable string that contains +corrections+. This
-    # formatter is designed to be less verbose to not take too much screen
-    # space while being helpful enough to the user.
-    #
-    # @example
-    #
-    #   formatter = DidYouMean::PlainFormatter.new
-    #
-    #   # displays suggestions in two lines with the leading empty line
-    #   puts formatter.message_for(["methods", "method"])
-    #
-    #   Did you mean?  methods
-    #                   method
-    #   # => nil
-    #
-    #   # displays an empty line
-    #   puts formatter.message_for([])
-    #
-    #   # => nil
-    #
-    def message_for(corrections)
-      corrections.empty? ? "" : "\nDid you mean?  #{corrections.join("\n               ")}"
-    end
-  end
-end
+warn "`require 'did_you_mean/formatters/plain_formatter'` is deprecated. Please `require 'did_you_mean/formatter'` " \
+     "instead."

lib/did_you_mean/formatters/verbose_formatter.rb

@@ -1,49 +1,9 @@
+warn "`require 'did_you_mean/formatters/verbose_formatter'` is deprecated and falls back to the default formatter. "
+
+require_relative '../formatter'
+
 # frozen-string-literal: true
-
 module DidYouMean
-  # The +DidYouMean::VerboseFormatter+ uses extra empty lines to make the
-  # suggestion stand out more in the error message.
-  #
-  # In order to activate the verbose formatter,
-  #
-  # @example
-  #
-  #   OBject
-  #   # => NameError: uninitialized constant OBject
-  #   #    Did you mean?  Object
-  #
-  #   require 'did_you_mean/verbose'
-  #
-  #   OBject
-  #   # => NameError: uninitialized constant OBject
-  #   #
-  #   #        Did you mean? Object
-  #   #
-  #
-  class VerboseFormatter
-
-    # Returns a human readable string that contains +corrections+. This
-    # formatter is designed to be less verbose to not take too much screen
-    # space while being helpful enough to the user.
-    #
-    # @example
-    #
-    #   formatter = DidYouMean::PlainFormatter.new
-    #
-    #   puts formatter.message_for(["methods", "method"])
-    #
-    #
-    #       Did you mean? methods
-    #                     method
-    #
-    #   # => nil
-    #
-    def message_for(corrections)
-      return "" if corrections.empty?
-
-      output = "\n\n    Did you mean? ".dup
-      output << corrections.join("\n                  ")
-      output << "\n "
-    end
-  end
+  # For compatibility:
+  VerboseFormatter = Formatter
 end

lib/did_you_mean/spell_checker.rb

@@ -10,25 +10,25 @@ module DidYouMean
     end
 
     def correct(input)
-      input     = normalize(input)
-      threshold = input.length > 3 ? 0.834 : 0.77
+      normalized_input = normalize(input)
+      threshold = normalized_input.length > 3 ? 0.834 : 0.77
 
-      words = @dictionary.select { |word| JaroWinkler.distance(normalize(word), input) >= threshold }
-      words.reject! { |word| input == word.to_s }
-      words.sort_by! { |word| JaroWinkler.distance(word.to_s, input) }
+      words = @dictionary.select { |word| JaroWinkler.distance(normalize(word), normalized_input) >= threshold }
+      words.reject! { |word| input.to_s == word.to_s }
+      words.sort_by! { |word| JaroWinkler.distance(word.to_s, normalized_input) }
       words.reverse!
 
       # Correct mistypes
-      threshold   = (input.length * 0.25).ceil
-      corrections = words.select { |c| Levenshtein.distance(normalize(c), input) <= threshold }
+      threshold   = (normalized_input.length * 0.25).ceil
+      corrections = words.select { |c| Levenshtein.distance(normalize(c), normalized_input) <= threshold }
 
       # Correct misspells
       if corrections.empty?
         corrections = words.select do |word|
           word   = normalize(word)
-          length = input.length < word.length ? input.length : word.length
+          length = normalized_input.length < word.length ? normalized_input.length : word.length
 
-          Levenshtein.distance(word, input) < length
+          Levenshtein.distance(word, normalized_input) < length
         end.first(1)
       end
 

lib/did_you_mean/spell_checkers/pattern_key_name_checker.rb

@@ -0,0 +1,20 @@
+require_relative "../spell_checker"
+
+module DidYouMean
+  class PatternKeyNameChecker
+    def initialize(no_matching_pattern_key_error)
+      @key = no_matching_pattern_key_error.key
+      @keys = no_matching_pattern_key_error.matchee.keys
+    end
+
+    def corrections
+      @corrections ||= exact_matches.empty? ? SpellChecker.new(dictionary: @keys).correct(@key).map(&:inspect) : exact_matches
+    end
+
+    private
+
+    def exact_matches
+      @exact_matches ||= @keys.select { |word| @key == word.to_s }.map(&:inspect)
+    end
+  end
+end

lib/did_you_mean/verbose.rb

@@ -1,4 +1,2 @@
-require_relative '../did_you_mean'
-require_relative 'formatters/verbose_formatter'
-
-DidYouMean.formatter = DidYouMean::VerboseFormatter.new
+warn "The verbose formatter has been removed and now `require 'did_you_mean/verbose'` has no effect. Please " \
+     "remove this call."

test/did_you_mean/spell_checking/test_pattern_key_name_check.rb

@@ -0,0 +1,20 @@
+require_relative '../helper'
+
+return if !defined?(::NoMatchingPatternKeyError)
+
+class PatternKeyNameCheckTest < Test::Unit::TestCase
+  include DidYouMean::TestHelper
+
+  def test_corrects_hash_key_name_with_single_pattern_match
+    error = assert_raise(NoMatchingPatternKeyError) do
+      eval(<<~RUBY, binding, __FILE__, __LINE__)
+        hash = {foo: 1, bar: 2, baz: 3}
+        hash => {fooo:}
+        fooo = 1 # suppress "unused variable: fooo" warning
+      RUBY
+    end
+
+    assert_correction ":foo", error.corrections
+    assert_match "Did you mean?  :foo", error.to_s
+  end
+end

test/did_you_mean/test_spell_checker.rb

@@ -10,6 +10,7 @@ class SpellCheckerTest < Test::Unit::TestCase
     assert_spell 'eval',  input: 'veal',  dictionary: ['email', 'fail', 'eval']
     assert_spell 'sub!',  input: 'suv!',  dictionary: ['sub', 'gsub', 'sub!']
     assert_spell 'sub',   input: 'suv',   dictionary: ['sub', 'gsub', 'sub!']
+    assert_spell 'Foo',   input: 'FOo',   dictionary: ['Foo', 'FOo']
 
     assert_spell %w(gsub! gsub),     input: 'gsuv!', dictionary: %w(sub gsub gsub!)
     assert_spell %w(sub! sub gsub!), input: 'ssub!', dictionary: %w(sub sub! gsub gsub!)

test/did_you_mean/test_verbose_formatter.rb

@@ -1,38 +0,0 @@
-require_relative './helper'
-
-class VerboseFormatterTest < Test::Unit::TestCase
-  class ErrorHighlightDummyFormatter
-    def message_for(spot)
-      ""
-    end
-  end
-
-  def setup
-    require_relative File.join(DidYouMean::TestHelper.root, 'verbose')
-
-    DidYouMean.formatter = DidYouMean::VerboseFormatter.new
-
-    if defined?(ErrorHighlight)
-      @error_highlight_old_formatter = ErrorHighlight.formatter
-      ErrorHighlight.formatter = ErrorHighlightDummyFormatter.new
-    end
-  end
-
-  def teardown
-    DidYouMean.formatter = DidYouMean::PlainFormatter.new
-
-    if defined?(ErrorHighlight)
-      ErrorHighlight.formatter = @error_highlight_old_formatter
-    end
-  end
-
-  def test_message
-    @error = assert_raise(NoMethodError){ 1.zeor? }
-
-    assert_match <<~MESSAGE.strip, @error.message
-      undefined method `zeor?' for 1:Integer
-
-          Did you mean? zero?
-    MESSAGE
-  end
-end