From 3894db0824bbb0023bce8402f1c4f578504fb8ce Mon Sep 17 00:00:00 2001
From: Geo Halkiadakis <gchalkiadakis@sklavenitis.co.gr>
Date: Mon, 15 Apr 2024 18:41:27 +0300
Subject: refactoring routes; added weighted exact and partial match routines

---
 utils/match-util.js | 38 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

(limited to 'utils/match-util.js')

diff --git a/utils/match-util.js b/utils/match-util.js
index a13fddb..b6b9fc0 100644
--- a/utils/match-util.js
+++ b/utils/match-util.js
@@ -64,7 +64,6 @@ const resemblance = (a, b, n) => {
 
 
 /** is_exact_match
- * 
  * check if a searching string -> query (string/latin in kb-format)
  * matches exactly an item of the array of synonyms -> chkArr (array of utf-8/strings)
  * 
@@ -84,9 +83,46 @@ function partial( query, chkArr ) {
     return found;
 }
 
+/** is exact match + weight rating
+ * @returns {float} weight rates depth of array when a match is found
+ */
+function weighted_exact( query, chkArr ) {
+    let weight = 0;   // closer to left/begin rating
+    let len = chkArr.length;
+    for(let i = 0; i < len ; i++) {
+        if (chkArr[i] == query) {
+            // rating weights array depth
+            weight = (len - i + 1.0) / len;
+            // console.log(i, weight, query);
+            break;
+        }
+    }
+    return weight;
+}
+
+
+/** is partial match + weight rating
+ * @returns {float} weight rates both match position and depth of match
+ */
+function weighted_partial( query, chkArr ) {
+    let rate = 0;
+    let weight = 0;
+    let len = chkArr.length;
+    for(let i = 0; i < len ; i++) {
+        let chk = chkArr[i].indexOf(query)
+        if (chk != -1) {
+            rate = (len -i +1.0) / (len + 2.0 * chk);
+            weight = rate > weight ? rate : weight;
+        }
+    }
+    return weight;
+}
+
 module.exports = {
     exact,
     partial,
+    weighted_exact,
+    weighted_partial,
     similarity,
     resemblance
 }
-- 
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