fix: ensure floats with leading periods work as expected (#112)

Fixes decaffeinate/decaffeinate#682
decaffeinate · Dec 30, 2016 · 6a0a142 · 6a0a142
1 parent 3945864
commit 6a0a142
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Showing 3 changed files with 35 additions and 1 deletion.
diff --git a/src/mappers/mapLiteral.ts b/src/mappers/mapLiteral.ts
@@ -39,7 +39,7 @@ export default function mapLiteral(context: ParseContext, node: Literal): Node {
     return new JavaScript(line, column, start, end, raw, virtual, node.value);
   }
 
-  if (startToken.type === SourceType.NUMBER) {
+  if (startToken.type === SourceType.NUMBER || startToken.type === SourceType.DOT) {
     if (raw.includes('.')) {
       return new Float(line, column, start, end, raw, virtual, parseNumber(node.value));
     } else {

diff --git a/test/examples/float-leading-period/input.coffee b/test/examples/float-leading-period/input.coffee
@@ -0,0 +1 @@
+.25
diff --git a/test/examples/float-leading-period/output.json b/test/examples/float-leading-period/output.json
@@ -0,0 +1,33 @@
+{
+  "type": "Program",
+  "line": 1,
+  "column": 1,
+  "range": [
+    0,
+    4
+  ],
+  "raw": ".25\n",
+  "body": {
+    "type": "Block",
+    "line": 1,
+    "column": 1,
+    "range": [
+      0,
+      3
+    ],
+    "statements": [
+      {
+        "type": "Float",
+        "line": 1,
+        "column": 1,
+        "range": [
+          0,
+          3
+        ],
+        "raw": ".25",
+        "data": 0.25
+      }
+    ],
+    "raw": ".25"
+  }
+}