SERVER-29587: Create $_internalSchemaMinItems and $_internalSchemaMaxItems MatchExpressions

1 files changed, 25 insertions, 0 deletions

diff --git a/src/mongo/db/matcher/expression_parser.h b/src/mongo/db/matcher/expression_parser.h
index 8141726251b..c39df98c77e 100644
--- a/src/mongo/db/matcher/expression_parser.h
+++ b/src/mongo/db/matcher/expression_parser.h
@@ -46,6 +46,11 @@ class OperationContext;
 class MatchExpressionParser {
 public:
     /**
+     * Constant double representation of 2^63.
+     */
+    static const double kLongLongMaxPlusOneAsDouble;
+
+    /**
      * caller has to maintain ownership obj
      * the tree has views (BSONElement) into obj
      */
@@ -56,6 +61,17 @@ public:
         return MatchExpressionParser(&extensionsCallback)._parse(obj, collator, topLevelCall);
     }
 
+    /**
+     * Parses a BSONElement of any numeric type into a positive long long, failing if the value
+     * is any of the following:
+     *
+     * - NaN
+     * - Too big or small to fit within a 64-bit signed integer.
+     * - A floating point number which is not integral.
+     */
+    static StatusWith<long long> parseIntegerElementToPositiveLong(const char* name,
+                                                                   const BSONElement& elem);
+
 private:
     MatchExpressionParser(const ExtensionsCallback* extensionsCallback)
         : _extensionsCallback(extensionsCallback) {}
@@ -169,6 +185,15 @@ private:
      */
     StatusWith<std::vector<uint32_t>> _parseBitPositionsArray(const BSONObj& theArray);
 
+    /**
+     * Parses the given BSONElement into a single integer argument and creates a MatchExpression
+     * of type 'T' that gets initialized with the resulting integer.
+     */
+    template <class T>
+    StatusWithMatchExpression _parseInternalSchemaSingleIntegerArgument(
+        const char* name, const BSONElement& elem) const;
+
+
     // The maximum allowed depth of a query tree. Just to guard against stack overflow.
     static const int kMaximumTreeDepth;