Check default @language BCP47 format.

- Emit event when invalid.
- Add tests.

Author: davidlehn

lib/context.js

@@ -24,6 +24,7 @@ const {
 } = require('./events');
 
 const {
+  REGEX_BCP47,
   asArray: _asArray,
   compareShortestLeast: _compareShortestLeast
 } = require('./util');
@@ -243,6 +244,22 @@ api.process = async ({
           'jsonld.SyntaxError',
           {code: 'invalid default language', context: ctx});
       } else {
+        if(!value.match(REGEX_BCP47)) {
+          if(options.eventHandler) {
+            _handleEvent({
+              event: {
+                type: ['JsonLdEvent'],
+                code: 'invalid @language value',
+                level: 'warning',
+                message: '@language value must be valid BCP47.',
+                details: {
+                  language: value
+                }
+              },
+              options
+            });
+          }
+        }
         rval['@language'] = value.toLowerCase();
       }
       defined.set('@language', true);

lib/expand.js

@@ -33,6 +33,7 @@ const {
 } = require('./url');
 
 const {
+  REGEX_BCP47,
   addValue: _addValue,
   asArray: _asArray,
   getValues: _getValues,
@@ -45,7 +46,6 @@ const {
 
 const api = {};
 module.exports = api;
-const REGEX_BCP47 = /^[a-zA-Z]{1,8}(-[a-zA-Z0-9]{1,8})*$/;
 
 /**
  * Recursively expands an element using the given context. Any context in

lib/util.js

@@ -10,6 +10,7 @@ const IdentifierIssuer = require('rdf-canonize').IdentifierIssuer;
 const JsonLdError = require('./JsonLdError');
 
 // constants
+const REGEX_BCP47 = /^[a-zA-Z]{1,8}(-[a-zA-Z0-9]{1,8})*$/;
 const REGEX_LINK_HEADERS = /(?:<[^>]*?>|"[^"]*?"|[^,])+/g;
 const REGEX_LINK_HEADER = /\s*<([^>]*?)>\s*(?:;\s*(.*))?/;
 const REGEX_LINK_HEADER_PARAMS =
@@ -24,6 +25,7 @@ const DEFAULTS = {
 const api = {};
 module.exports = api;
 api.IdentifierIssuer = IdentifierIssuer;
+api.REGEX_BCP47 = REGEX_BCP47;
 
 /**
  * Clones an object, array, Map, Set, or string/number. If a typed JavaScript

tests/misc.js

@@ -1358,6 +1358,84 @@ describe('events', () => {
         testNotStrict: true
       });
     });
+
+    it('should emit for invalid @language value', async () => {
+      const input =
+{
+  "urn:property": {
+    "@language": "en_us",
+    "@value": "test"
+  }
+}
+;
+      const expected =
+[
+  {
+    "urn:property": [
+      {
+        "@language": "en_us",
+        "@value": "test"
+      }
+    ]
+  }
+]
+;
+
+      console.error('FIXME');
+      await _test({
+        type: 'expand',
+        input,
+        expected,
+        mapCounts: {},
+        eventCounts: {
+          codes: {
+            'invalid @language value': 1
+          },
+          events: 1
+        },
+        testNotSafe: true,
+        testNotStrict: true
+      });
+    });
+
+    it('should emit for invalid default @language value', async () => {
+      const input =
+{
+  "@context": {
+    "@language": "en_us"
+  },
+  "urn:property": "value"
+}
+;
+      const expected =
+[
+  {
+    "urn:property": [
+      {
+        "@language": "en_us",
+        "@value": "value"
+      }
+    ]
+  }
+]
+;
+
+      console.error('FIXME');
+      await _test({
+        type: 'expand',
+        input,
+        expected,
+        mapCounts: {},
+        eventCounts: {
+          codes: {
+            'invalid @language value': 1
+          },
+          events: 1
+        },
+        testNotSafe: true,
+        testNotStrict: true
+      });
+    });
   });
 
   describe('unmappedProperty', () => {