X-Git-Url: https://git.yukkurigames.com/?p=enjoyable.git;a=blobdiff_plain;f=NJMapping.m;h=8cc572407945ac02b21a1171123e94e884a16995;hp=7df321ce232a0da3e96806464fa7cf00cea77be5;hb=5c488091214f1aca932fa74623e024a4d0c245a2;hpb=b18839d1b922bcf00b5ada21e1748b6d78c6773f

diff --git a/NJMapping.m b/NJMapping.m
index 7df321c..8cc5724 100644
--- a/NJMapping.m
+++ b/NJMapping.m
@@ -8,6 +8,7 @@
 #import "NJMapping.h"
 
 #import "NJInput.h"
+#import "NJOutput.h"
 
 @implementation NJMapping
 
@@ -53,4 +54,38 @@
     return success;
 }
 
++ (id)mappingWithContentsOfURL:(NSURL *)url mappings:(NSArray *)mappings error:(NSError **)error {
+    NSInputStream *stream = [NSInputStream inputStreamWithURL:url];
+    [stream open];
+    NSDictionary *serialization = stream && !*error
+        ? [NSJSONSerialization JSONObjectWithStream:stream options:0 error:error]
+        : nil;
+    [stream close];
+    
+    if (!serialization && error)
+        return nil;
+    
+    if (!([serialization isKindOfClass:NSDictionary.class]
+          && [serialization[@"name"] isKindOfClass:NSString.class]
+          && [serialization[@"entries"] isKindOfClass:NSDictionary.class])) {
+        *error = [NSError errorWithDomain:@"Enjoyable"
+                                     code:0
+                              description:@"This isn't a valid mapping file."];
+        return nil;
+    }
+    
+    NSDictionary *entries = serialization[@"entries"];
+    NJMapping *mapping = [[NJMapping alloc] initWithName:serialization[@"name"]];
+    for (id key in entries) {
+        NSDictionary *value = entries[key];
+        if ([key isKindOfClass:NSString.class]) {
+            NJOutput *output = [NJOutput outputDeserialize:value
+                                              withMappings:mappings];
+            if (output)
+                mapping.entries[key] = output;
+        }
+    }
+    return mapping;
+}
+
 @end