Add linked message formatting

gitbook/en/messages.md

@@ -102,3 +102,44 @@ Output the below:
 ```html
 <p>DIO: the world !!!!</p>
 ```
+
+### Formatting linked locale messages
+
+If the language distinguish cases of character, you may need control the case of the linked locale messages.
+Linked messages can be formatted with modifier  `@.MODIFIER:key`
+
+The below modifiers are available currently.
+
+* `upper`: Uppercase all characters in the linked message.
+* `lower`: Lowercase all characters in the linked message.
+
+Locale messages the below:
+
+```javascript
+const messages = {
+  en: {
+    message: {
+      homeAddress: 'Home address',
+      missingHomeAddress: 'Please provide @.lower:message.homeAddress'
+    }
+  }
+}
+```
+
+Template the below:
+
+```html
+<label>{{ $t('message.missingHomeAddress') }}</label>
+
+<p class="error">{{ $t('message.missingHomeAddress') }}</p>
+
+```
+
+Output the below:
+
+```html
+<label>Home address</label>
+
+<p class="error">Please provide home address</p>
+```
+

src/index.js

@@ -31,8 +31,13 @@ const numberFormatKeys = [
   'localeMatcher',
   'formatMatcher'
 ]
-const linkKeyMatcher = /(?:@:(?:[\w\-_|.]+|\([\w\-_|.]+\)))/g
+const linkKeyMatcher = /(?:@(?:\.[a-z]+)?:(?:[\w\-_|.]+|\([\w\-_|.]+\)))/g
+const linkKeyPrefixMatcher = /^@(?:\.([a-z]+))?:/
 const bracketsMatcher = /[()]/g
+const formatters = {
+  'upper': (str) => str.toLocaleUpperCase(),
+  'lower': (str) => str.toLocaleLowerCase()
+}
 
 export default class VueI18n {
   static install: () => void
@@ -234,7 +239,7 @@ export default class VueI18n {
     }
 
     // Check for the existence of links within the translated string
-    if (ret.indexOf('@:') >= 0) {
+    if (ret.indexOf('@:') >= 0 || ret.indexOf('@.') >= 0) {
       ret = this._link(locale, message, ret, host, interpolateMode, values, visitedLinkStack)
     }
 
@@ -263,8 +268,11 @@ export default class VueI18n {
         continue
       }
       const link: string = matches[idx]
-      // Remove the leading @: and the brackets
-      const linkPlaceholder: string = link.substr(2).replace(bracketsMatcher, '')
+      const linkKeyPrefixMatches: any = link.match(linkKeyPrefixMatcher)
+      const [linkPrefix, formatterName] = linkKeyPrefixMatches
+
+      // Remove the leading @:, @.case: and the brackets
+      const linkPlaceholder: string = link.replace(linkPrefix, '').replace(bracketsMatcher, '')
 
       if (visitedLinkStack.includes(linkPlaceholder)) {
         if (process.env.NODE_ENV !== 'production') {
@@ -298,6 +306,9 @@ export default class VueI18n {
         locale, linkPlaceholder, translated, host,
         Array.isArray(values) ? values : [values]
       )
+      if (formatters.hasOwnProperty(formatterName)) {
+        translated = formatters[formatterName](translated)
+      }
 
       visitedLinkStack.pop()
 

test/unit/basic.test.js

@@ -29,30 +29,34 @@ describe('basic', () => {
       it('should translate simple link', () => {
         assert.equal(i18n.t('message.link'), messages.en.message.hello)
       })
-    })
 
-    describe('linked translation', () => {
       it('should translate link at the end of locale', () => {
         assert.equal(i18n.t('message.linkEnd'), 'This is a linked translation to the world')
       })
-    })
 
-    describe('linked translation', () => {
       it('should translate link within a locale', () => {
         assert.equal(i18n.t('message.linkWithin'), 'Isn\'t the world we live in great?')
       })
-    })
 
-    describe('linked translation', () => {
       it('should translate multiple links within a locale', () => {
         assert.equal(i18n.t('message.linkMultiple'), 'Hello hoge!, isn\'t the world great?')
       })
-    })
 
-    describe('linked translation', () => {
       it('should translate link with braces ', () => {
         assert.strictEqual(i18n.t('message.linkBrackets'), 'Hello hoge. Isn\'t the world great?')
       })
+
+      it('should translate link with lower-case formatting', () => {
+        assert.strictEqual(i18n.t('message.linkCaseLower'), 'Please provide home address')
+      })
+
+      it('should translate link with upper-case formatting', () => {
+        assert.strictEqual(i18n.t('message.linkCaseUpper'), 'HOME ADDRESS')
+      })
+
+      it('should translate link without formatting if modifier is not known.', () => {
+        assert.strictEqual(i18n.t('message.linkCaseUnknown'), 'Home address')
+      })
     })
 
     describe('ja locale', () => {

test/unit/fixture/index.js

@@ -17,6 +17,10 @@ export default {
       linkHyphen: '@:hyphen-hello',
       linkUnderscore: '@:underscore_hello',
       linkList: '@:message.hello: {0} {1}',
+      linkCaseLower: 'Please provide @.lower:message.homeAddress',
+      linkCaseUpper: '@.upper:message.homeAddress',
+      linkCaseUnknown: '@.unknown:message.homeAddress',
+      homeAddress: 'Home address',
       circular1: 'Foo @:message.circular2',
       circular2: 'Bar @:message.circular3',
       circular3: 'Buz @:message.circular1',