Coverage Summary for Class: FtsQuery (com.georgeci.moneysurfer.data.db)

 package com.georgeci.moneysurfer.data.db
 
 /**
  * Turns free-form user input into an FTS4 MATCH expression.
  *
  * Raw input must never reach `MATCH`: unbalanced quotes are a syntax error (SQLite
  * throws, the Flow dies), and bare `OR` / `NOT` / `NEAR` are operators, not words.
  * Everything that is not a letter or a digit is therefore treated as a separator, and
  * each surviving token gets a `*` so typing progressively narrows results instead of
  * matching nothing until the word is complete — the trailing `*` also demotes operator
  * keywords back to ordinary terms.
  *
  * Tokens are space-joined, i.e. implicitly AND-ed by FTS4.
  */
 object FtsQuery {
 
     /** Returns null when [raw] carries no searchable token — callers should skip the query. */
     fun fromUserInput(raw: String): String? {
         val tokens = raw
             .map { if (it.isLetterOrDigit()) it else ' ' }
             .joinToString(separator = "")
             .split(' ')
             .filter { it.isNotEmpty() }
         return if (tokens.isEmpty()) null else tokens.joinToString(separator = " ") { "$it*" }
     }
 }