Always make objects with all-digit keys into maps. Fixes #819

src/InferMaps.ts

@@ -28,6 +28,15 @@ function shouldBeMap(properties: Map<string, ClassProperty>): Set<Type> | undefi
     const numProperties = properties.size;
     if (numProperties < 2) return undefined;
 
+    // If all property names are digit-only, we always make a map, no
+    // questions asked.
+    if (properties.keySeq().every(n => n.match(/^[0-9]+$/) !== null)) {
+        return properties
+            .valueSeq()
+            .map(cp => cp.type)
+            .toSet();
+    }
+
     if (numProperties < mapSizeThreshold) {
         const names = properties.keySeq();
         const probabilities = names.map(nameProbability);

test/fixtures.ts

@@ -325,6 +325,11 @@ class JSONToXToYFixture extends JSONFixture {
       allowMissingNull: this.runLanguage.allowMissingNull
     });
   }
+
+  shouldSkipTest(sample: Sample): boolean {
+    if (super.shouldSkipTest(sample)) return true;
+    return _.includes(this.runLanguage.skipJSON, path.basename(sample.path));
+  }
 }
 
 // This tests generating Schema from JSON, and then generating
@@ -446,6 +451,7 @@ class JSONTypeScriptFixture extends JSONToXToYFixture {
   }
 
   shouldSkipTest(sample: Sample): boolean {
+    if (super.shouldSkipTest(sample)) return true;
     return skipTypeScriptTests.indexOf(path.basename(sample.path)) >= 0;
   }
 }

test/languages.ts

@@ -47,6 +47,7 @@ export const CSharpLanguage: Language = {
   output: "QuickType.cs",
   topLevel: "TopLevel",
   skipJSON: [
+    "nbl-stats.json", // See issue #823
     "31189.json" // JSON.NET doesn't accept year 0000 as 1BC, though it should
   ],
   skipMiscJSON: false,
@@ -138,6 +139,7 @@ export const RubyLanguage: Language = {
     "bug427.json",
     "kitchen-sink.json",
     "github-events.json",
+    "nbl-stats.json",
     "reddit.json",
     "00c36.json",
     "050b0.json",
@@ -208,6 +210,7 @@ export const GoLanguage: Language = {
     "bug427.json",
     "github-events.json",
     "reddit.json",
+    "nbl-stats.json",
     "0cffa.json",
     "0e0c2.json",
     "127a1.json",
@@ -269,7 +272,9 @@ export const CPlusPlusLanguage: Language = {
   topLevel: "TopLevel",
   skipJSON: [
     // fails on a string containing null
-    "nst-test-suite.json"
+    "nst-test-suite.json",
+    // compiler error I don't want to figure out right now
+    "nbl-stats.json"
   ],
   skipMiscJSON: false,
   skipSchema: [],
@@ -293,6 +298,7 @@ export const ElmLanguage: Language = {
   skipDiffViaSchema: [
     "reddit.json",
     "github-events.json",
+    "nbl-stats.json",
     "0a91a.json",
     "0cffa.json",
     "0e0c2.json",
@@ -444,6 +450,7 @@ export const TypeScriptLanguage: Language = {
   skipDiffViaSchema: [
     "bug427.json",
     "kitchen-sink.json",
+    "nbl-stats.json",
     "00c36.json",
     "2df80.json",
     "34702.json",