Put processingMode on the context, rather than the API.

Author: gkellogg

lib/context.js

@@ -96,19 +96,19 @@ api.process = ({activeCtx, localCtx, options}) => {
           'Unsupported JSON-LD version: ' + ctx['@version'],
           'jsonld.UnsupportedVersion',
           {code: 'invalid @version value', context: ctx});
-      } else if(api.processingMode && api.processingMode.indexOf('json-ld-1.1') !== 0) {
+      } else if(activeCtx.processingMode && activeCtx.processingMode.indexOf('json-ld-1.1') !== 0) {
         throw new JsonLdError(
-          '@version: ' + ctx['@version'] + ' not compatible with ' + api.processingMode,
+          '@version: ' + ctx['@version'] + ' not compatible with ' + activeCtx.processingMode,
           'jsonld.ProcessingModeConflict',
           {code: 'processing mode conflict', context: ctx});
       }
-      api.processingMode = api.processingMode || 'json-ld-1.1';
+      rval.processingMode = 'json-ld-1.1';
       rval['@version'] = ctx['@version'];
       defined['@version'] = true;
     }
 
     // If not set explicitly, set processingMode to "json-ld-1.0"
-    api.processingMode = api.processingMode || 'json-ld-1.0';
+    rval.processingMode = rval.processingMode || activeCtx.processingMode || 'json-ld-1.0';
 
     // handle @base
     if('@base' in ctx) {
@@ -386,7 +386,7 @@ api.createTermDefinition = (activeCtx, localCtx, term, defined) => {
     let hasSet = container.includes('@set');
 
     // JSON-LD 1.1 support
-    if(api.processingMode.indexOf('json-ld-1.1') === 0) {
+    if(activeCtx.processingMode && activeCtx.processingMode.indexOf('json-ld-1.1') === 0) {
       // TODO: @id and @type
       validContainers.push('@graph');
 
@@ -536,9 +536,6 @@ api.expandIri = (activeCtx, value, relativeTo, localCtx, defined) => {
   return value;
 };
 
-// If not set in options, determined in first context which is an object.
-api.processingMode = null;
-
 /**
  * Gets the initial context.
  *
@@ -549,9 +546,9 @@ api.processingMode = null;
  */
 api.getInitialContext = (options) => {
   const base = parseUrl(options.base || '');
-  if(options.processingMode) api.processingMode = options.processingMode;
   return {
     '@base': base,
+    processingMode: options.processingMode,
     mappings: {},
     inverse: null,
     getInverse: _createInverseContext,