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+/*
+ * JSON Grammar
+ * ============
+ *
+ * Based on the grammar from RFC 7159 [1].
+ *
+ * Note that JSON is also specified in ECMA-262 [2], ECMA-404 [3], and on the
+ * JSON website [4] (somewhat informally). The RFC seems the most authoritative
+ * source, which is confirmed e.g. by [5].
+ *
+ * [1] http://tools.ietf.org/html/rfc7159
+ * [2] http://www.ecma-international.org/publications/standards/Ecma-262.htm
+ * [3] http://www.ecma-international.org/publications/standards/Ecma-404.htm
+ * [4] http://json.org/
+ * [5] https://www.tbray.org/ongoing/When/201x/2014/03/05/RFC7159-JSON
+ */
+
+/* ----- 2. JSON Grammar ----- */
+
+JSON_text
+  = ws value:value ws { return value; }
+
+begin_array     = ws "[" ws
+begin_object    = ws "{" ws
+end_array       = ws "]" ws
+end_object      = ws "}" ws
+name_separator  = ws ":" ws
+value_separator = ws "," ws
+
+ws "whitespace" = [ \t\n\r]*
+
+/* ----- 3. Values ----- */
+
+value
+  = false
+  / null
+  / true
+  / object
+  / array
+  / number
+  / string
+
+false = "false" { return false; }
+null  = "null"  { return null;  }
+true  = "true"  { return true;  }
+
+/* ----- 4. Objects ----- */
+
+object
+  = begin_object
+    members:(
+      head:member
+      tail:(value_separator m:member { return m; })*
+      {
+        var result = {}, i;
+
+        result[head.name] = head.value;
+
+        for (i = 0; i < tail.length; i++) {
+          result[tail[i].name] = tail[i].value;
+        }
+
+        return result;
+      }
+    )?
+    end_object
+    { return members !== null ? members: {}; }
+
+member
+  = name:string name_separator value:value {
+      return { name: name, value: value };
+    }
+
+/* ----- 5. Arrays ----- */
+
+array
+  = begin_array
+    values:(
+      head:value
+      tail:(value_separator v:value { return v; })*
+      { return [head].concat(tail); }
+    )?
+    end_array
+    { return values !== null ? values : []; }
+
+/* ----- 6. Numbers ----- */
+
+number "number"
+  = minus? int frac? exp? { return parseFloat(text()); }
+
+decimal_point = "."
+digit1_9      = [1-9]
+e             = [eE]
+exp           = e (minus / plus)? DIGIT+
+frac          = decimal_point DIGIT+
+int           = zero / (digit1_9 DIGIT*)
+minus         = "-"
+plus          = "+"
+zero          = "0"
+
+/* ----- 7. Strings ----- */
+
+string "string"
+  = quotation_mark chars:char* quotation_mark { return chars.join(""); }
+
+char
+  = unescaped
+  / escape
+    sequence:(
+        '"'
+      / "\\"
+      / "/"
+      / "b" { return "\b"; }
+      / "f" { return "\f"; }
+      / "n" { return "\n"; }
+      / "r" { return "\r"; }
+      / "t" { return "\t"; }
+      / "u" digits:$(HEXDIG HEXDIG HEXDIG HEXDIG) {
+          return String.fromCharCode(parseInt(digits, 16));
+        }
+    )
+    { return sequence; }
+
+escape         = "\\"
+quotation_mark = '"'
+unescaped      = [^\0-\x1F\x22\x5C]
+
+/* ----- Core ABNF Rules ----- */
+
+/* See RFC 4234, Appendix B (http://tools.ietf.org/html/rfc4627). */
+DIGIT  = [0-9]
+HEXDIG = [0-9a-f]i