Move keword regex to util.js.

Author: davidlehn

lib/context.js

@@ -25,13 +25,13 @@ const {
 
 const {
   REGEX_BCP47,
+  REGEX_KEYWORD,
   asArray: _asArray,
   compareShortestLeast: _compareShortestLeast
 } = require('./util');
 
 const INITIAL_CONTEXT_CACHE = new Map();
 const INITIAL_CONTEXT_CACHE_MAX_SIZE = 10000;
-const KEYWORD_PATTERN = /^@[a-zA-Z]+$/;
 
 const api = {};
 module.exports = api;
@@ -492,7 +492,7 @@ api.createTermDefinition = ({
       'Invalid JSON-LD syntax; keywords cannot be overridden.',
       'jsonld.SyntaxError',
       {code: 'keyword redefinition', context: localCtx, term});
-  } else if(term.match(KEYWORD_PATTERN)) {
+  } else if(term.match(REGEX_KEYWORD)) {
     if(options.eventHandler) {
       _handleEvent({
         event: {
@@ -587,7 +587,7 @@ api.createTermDefinition = ({
         'jsonld.SyntaxError', {code: 'invalid IRI mapping', context: localCtx});
     }
 
-    if(reverse.match(KEYWORD_PATTERN)) {
+    if(reverse.match(REGEX_KEYWORD)) {
       if(options.eventHandler) {
         _handleEvent({
           event: {
@@ -636,7 +636,7 @@ api.createTermDefinition = ({
     if(id === null) {
       // reserve a null term, which may be protected
       mapping['@id'] = null;
-    } else if(!api.isKeyword(id) && id.match(KEYWORD_PATTERN)) {
+    } else if(!api.isKeyword(id) && id.match(REGEX_KEYWORD)) {
       if(options.eventHandler) {
         _handleEvent({
           event: {
@@ -1019,7 +1019,7 @@ function _expandIri(activeCtx, value, relativeTo, localCtx, defined, options) {
   }
 
   // ignore non-keyword things that look like a keyword
-  if(value.match(KEYWORD_PATTERN)) {
+  if(value.match(REGEX_KEYWORD)) {
     return null;
   }
 

lib/util.js

@@ -15,6 +15,7 @@ const REGEX_LINK_HEADERS = /(?:<[^>]*?>|"[^"]*?"|[^,])+/g;
 const REGEX_LINK_HEADER = /\s*<([^>]*?)>\s*(?:;\s*(.*))?/;
 const REGEX_LINK_HEADER_PARAMS =
   /(.*?)=(?:(?:"([^"]*?)")|([^"]*?))\s*(?:(?:;\s*)|$)/g;
+const REGEX_KEYWORD = /^@[a-zA-Z]+$/;
 
 const DEFAULTS = {
   headers: {
@@ -26,6 +27,7 @@ const api = {};
 module.exports = api;
 api.IdentifierIssuer = IdentifierIssuer;
 api.REGEX_BCP47 = REGEX_BCP47;
+api.REGEX_KEYWORD = REGEX_KEYWORD;
 
 /**
  * Clones an object, array, Map, Set, or string/number. If a typed JavaScript