Refactor search query parser and handle nested quote types

app/lib/search_query_parser.rb

@@ -1,15 +1,20 @@
 # frozen_string_literal: true
 
 class SearchQueryParser < Parslet::Parser
-  rule(:term)      { match('[^\s":]').repeat(1).as(:term) }
-  rule(:quote)     { str('"') }
+  rule(:term)      { match('[^\s]').repeat(1).as(:term) }
   rule(:colon)     { str(':') }
   rule(:space)     { match('\s').repeat(1) }
   rule(:operator)  { (str('+') | str('-')).as(:operator) }
-  rule(:prefix)    { term >> colon }
-  rule(:shortcode) { (colon >> term >> colon.maybe).as(:shortcode) }
-  rule(:phrase)    { (quote >> (match('[^\s"]').repeat(1).as(:term) >> space.maybe).repeat >> quote).as(:phrase) }
-  rule(:clause)    { (operator.maybe >> prefix.maybe.as(:prefix) >> (phrase | term | shortcode)).as(:clause) | prefix.as(:clause) | quote.as(:junk) }
+  rule(:prefix_operator) { str('has') | str('is') | str('language') | str('from') | str('before') | str('after') | str('during') | str('in') }
+  rule(:prefix)    { prefix_operator.as(:prefix_operator) >> colon }
+  rule(:phrase)    do
+    (str('"') >> match('[^"]').repeat.as(:phrase) >> str('"')) |
+      (match('[“”„]') >> match('[^“”„]').repeat.as(:phrase) >> match('[“”„]')) |
+      (str('«') >> match('[^«»]').repeat.as(:phrase) >> str('»')) |
+      (str('「') >> match('[^「」]').repeat.as(:phrase) >> str('」')) |
+      (str('《') >> match('[^《》]').repeat.as(:phrase) >> str('》'))
+  end
+  rule(:clause)    { (operator.maybe >> prefix.maybe.as(:prefix) >> (phrase | term)).as(:clause) }
   rule(:query)     { (clause >> space.maybe).repeat.as(:query) }
   root(:query)
 end

app/lib/search_query_transformer.rb

@@ -1,17 +1,6 @@
 # frozen_string_literal: true
 
 class SearchQueryTransformer < Parslet::Transform
-  SUPPORTED_PREFIXES = %w(
-    has
-    is
-    language
-    from
-    before
-    after
-    during
-    in
-  ).freeze
-
   class Query
     def initialize(clauses, options = {})
       raise ArgumentError if options[:current_account].nil?
@@ -223,14 +212,12 @@ class SearchQueryTransformer < Parslet::Transform
   end
 
   rule(clause: subtree(:clause)) do
-    prefix   = clause[:prefix][:term].to_s if clause[:prefix]
+    prefix   = clause[:prefix][:prefix_operator].to_s if clause[:prefix]
     operator = clause[:operator]&.to_s
-    term     = clause[:phrase] ? clause[:phrase].map { |term| term[:term].to_s }.join(' ') : clause[:term].to_s
+    term     = clause[:phrase] ? clause[:phrase].to_s : clause[:term].to_s
 
-    if clause[:prefix] && SUPPORTED_PREFIXES.include?(prefix)
+    if clause[:prefix]
       PrefixClause.new(prefix, operator, term, current_account: current_account)
-    elsif clause[:prefix]
-      TermClause.new(operator, "#{prefix} #{term}")
     elsif clause[:term]
       TermClause.new(operator, term)
     elsif clause[:phrase]
@@ -240,10 +227,6 @@ class SearchQueryTransformer < Parslet::Transform
     end
   end
 
-  rule(junk: subtree(:junk)) do
-    nil
-  end
-
   rule(query: sequence(:clauses)) do
     Query.new(clauses, current_account: current_account)
   end

app/services/search_service.rb

@@ -1,10 +1,8 @@
 # frozen_string_literal: true
 
 class SearchService < BaseService
-  QUOTE_EQUIVALENT_CHARACTERS = /[“”„«»「」『』《》]/
-
   def call(query, account, limit, options = {})
-    @query     = query&.strip&.gsub(QUOTE_EQUIVALENT_CHARACTERS, '"')
+    @query     = query&.strip
     @account   = account
     @options   = options
     @limit     = limit.to_i

spec/lib/search_query_parser_spec.rb

@@ -10,11 +10,19 @@ describe SearchQueryParser do
     it 'consumes "hello"' do
       expect(parser.term).to parse('hello')
     end
+
+    it 'consumes "foo:"' do
+      expect(parser.term).to parse('foo:')
+    end
+
+    it 'consumes ":foo:"' do
+      expect(parser.term).to parse(':foo:')
+    end
   end
 
   context 'with prefix' do
-    it 'consumes "foo:"' do
-      expect(parser.prefix).to parse('foo:')
+    it 'consumes "is:"' do
+      expect(parser.prefix).to parse('is:')
     end
   end
 
@@ -28,16 +36,18 @@ describe SearchQueryParser do
     end
   end
 
-  context 'with shortcode' do
-    it 'consumes ":foo:"' do
-      expect(parser.shortcode).to parse(':foo:')
-    end
-  end
-
   context 'with phrase' do
     it 'consumes "hello world"' do
       expect(parser.phrase).to parse('"hello world"')
     end
+
+    it 'consumes "hello “new” world"' do
+      expect(parser.phrase).to parse('"hello “new” world"')
+    end
+
+    it 'consumes “hello « hi » world”' do
+      expect(parser.phrase).to parse('“hello « hi » world”')
+    end
   end
 
   context 'with clause' do
@@ -57,14 +67,6 @@ describe SearchQueryParser do
       expect(parser.clause).to parse('-foo:bar')
     end
 
-    it 'consumes \'foo:"hello world"\'' do
-      expect(parser.clause).to parse('foo:"hello world"')
-    end
-
-    it 'consumes \'-foo:"hello world"\'' do
-      expect(parser.clause).to parse('-foo:"hello world"')
-    end
-
     it 'consumes "foo:"' do
       expect(parser.clause).to parse('foo:')
     end
@@ -94,5 +96,13 @@ describe SearchQueryParser do
     it 'consumes "foo:bar bar: hello"' do
       expect(parser.query).to parse('foo:bar bar: hello')
     end
+
+    it 'consumes \'foo:"hello world"\'' do
+      expect(parser.query).to parse('foo:"hello world"')
+    end
+
+    it 'consumes \'-foo:"hello world"\'' do
+      expect(parser.query).to parse('-foo:"hello world"')
+    end
   end
 end

spec/lib/search_query_transformer_spec.rb

@@ -42,7 +42,7 @@ describe SearchQueryTransformer do
     let(:query) { 'foo: bar' }
 
     it 'transforms clauses' do
-      expect(subject.send(:must_clauses).map(&:term)).to match_array %w(foo bar)
+      expect(subject.send(:must_clauses).map(&:term)).to match_array %w(foo: bar)
       expect(subject.send(:must_not_clauses)).to be_empty
       expect(subject.send(:filter_clauses)).to be_empty
     end
@@ -52,7 +52,7 @@ describe SearchQueryTransformer do
     let(:query) { 'foo:bar' }
 
     it 'transforms clauses' do
-      expect(subject.send(:must_clauses).map(&:term)).to contain_exactly('foo bar')
+      expect(subject.send(:must_clauses).map(&:term)).to contain_exactly('foo:bar')
       expect(subject.send(:must_not_clauses)).to be_empty
       expect(subject.send(:filter_clauses)).to be_empty
     end