adding input masker script

script.js

@@ -124,3 +124,32 @@ function pesquisacep(valor) {
         limpa_formulário_cep();
     }
 };
+document.addEventListener('DOMContentLoaded', () => {
+    for (const el of document.querySelectorAll("[placeholder][data-slots]")) {
+        const pattern = el.getAttribute("placeholder"),
+            slots = new Set(el.dataset.slots || "_"),
+            prev = (j => Array.from(pattern, (c,i) => slots.has(c)? j=i+1: j))(0),
+            first = [...pattern].findIndex(c => slots.has(c)),
+            accept = new RegExp(el.dataset.accept || "\\d", "g"),
+            clean = input => {
+                input = input.match(accept) || [];
+                return Array.from(pattern, c =>
+                    input[0] === c || slots.has(c) ? input.shift() || c : c
+                );
+            },
+            format = () => {
+                const [i, j] = [el.selectionStart, el.selectionEnd].map(i => {
+                    i = clean(el.value.slice(0, i)).findIndex(c => slots.has(c));
+                    return i<0? prev[prev.length-1]: back? prev[i-1] || first: i;
+                });
+                el.value = clean(el.value).join``;
+                el.setSelectionRange(i, j);
+                back = false;
+            };
+        let back = false;
+        el.addEventListener("keydown", (e) => back = e.key === "Backspace");
+        el.addEventListener("input", format);
+        el.addEventListener("focus", format);
+        el.addEventListener("blur", () => el.value === pattern && (el.value=""));
+    }
+});