fix(escape): first character escaped (#49)

Allow first character to be escaped

Author: dima-bzz

src/masker.js

@@ -77,9 +77,6 @@ export function formatter(value, config) {
     const masker = tokens[maskChar]
     let char = value[valueIndex]
 
-    // no more input characters and next character is a masked one
-    if (!char && masker) break
-
     if (masker && !escaped) {
       // when is escape char, do not mask, just continue
       if (masker.escape) {
@@ -88,6 +85,9 @@ export function formatter(value, config) {
         continue
       }
 
+      // no more input characters and next character is a masked one
+      if (!char) break
+
       if (masker.pattern.test(char)) {
         char = masker.transform ? masker.transform(char) : char
         output.unmasked += char

tests/formatter.test.js

@@ -66,6 +66,14 @@ test('empty -> +1 # 5', () => {
   expect(formatter('', { mask: '+1 # 5', prefill: true })).toMatchObject({ masked: '+1 ', unmasked: '' })
 })
 
+test('escaped -> \\+1 # 5', () => {
+  expect(formatter('', { mask: '\\+1 # 5', prefill: true })).toMatchObject({ masked: '+1 ', unmasked: '' })
+})
+
+test('2 -> \\A # 5 \\A\\A', () => {
+  expect(formatter('2', { mask: '\\A # 5 \\A\\A', prefill: true })).toMatchObject({ masked: 'A 2 5 AA', unmasked: '2' })
+})
+
 test('France IBAN', () => {
   expect(
     formatter('FR7630006000011234567890189', {