1 files changed, 14 insertions, 0 deletions
diff --git a/app/lib/search_query_parser.rb b/app/lib/search_query_parser.rb
new file mode 100644
index 000000000..405ad15b8
--- /dev/null
+++ b/app/lib/search_query_parser.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+class SearchQueryParser < Parslet::Parser
+  rule(:term)     { match('[^\s":]').repeat(1).as(:term) }
+  rule(:quote)    { str('"') }
+  rule(:colon)    { str(':') }
+  rule(:space)    { match('\s').repeat(1) }
+  rule(:operator) { (str('+') | str('-')).as(:operator) }
+  rule(:prefix)   { (term >> colon).as(:prefix) }
+  rule(:phrase)   { (quote >> (term >> space.maybe).repeat >> quote).as(:phrase) }
+  rule(:clause)   { (prefix.maybe >> operator.maybe >> (phrase | term)).as(:clause) }
+  rule(:query)    { (clause >> space.maybe).repeat.as(:query) }
+  root(:query)
+end