init push

internal/service/sort_helper.go

@@ -0,0 +1,50 @@
+package service
+
+import "strings"
+
+type sortRule struct {
+	keys []string
+	asc  string
+	desc string
+}
+
+func sortField(column string, keys ...string) sortRule {
+	if len(keys) == 0 {
+		keys = []string{column}
+	}
+	return sortRule{
+		keys: keys,
+		asc:  column + " ASC",
+		desc: column + " DESC",
+	}
+}
+
+func sortExpr(asc, desc string, keys ...string) sortRule {
+	return sortRule{
+		keys: keys,
+		asc:  asc,
+		desc: desc,
+	}
+}
+
+func normalizeSortByRules(sort string, rules ...sortRule) string {
+	for _, rule := range rules {
+		for _, key := range rule.keys {
+			key = strings.TrimSpace(key)
+			if key == "" {
+				continue
+			}
+			if sort == key {
+				return rule.asc
+			}
+			if sort == "-"+key {
+				return rule.desc
+			}
+		}
+	}
+	return ""
+}
+
+func joinSortClauses(clauses []string) string {
+	return strings.Join(clauses, ", ")
+}