SERVER-37168 Add validators for IDL fields

1 files changed, 27 insertions, 0 deletions

diff --git a/buildscripts/idl/idl/ast.py b/buildscripts/idl/idl/ast.py
index e5eda3b8426..7b2c85fda1f 100644
--- a/buildscripts/idl/idl/ast.py
+++ b/buildscripts/idl/idl/ast.py
@@ -92,6 +92,30 @@ class Struct(common.SourceLocation):
         super(Struct, self).__init__(file_name, line, column)
 
 
+class Validator(common.SourceLocation):
+    """
+    An instance of a validator for a field.
+
+    The validator must include at least one of the defined validation predicates.
+    If more than one is included, they must ALL evaluate to true.
+    """
+
+    # pylint: disable=too-many-instance-attributes
+
+    def __init__(self, file_name, line, column):
+        # type: (unicode, int, int) -> None
+        """Construct a Validator."""
+        # Don't lint gt/lt as bad attribute names.
+        # pylint: disable=C0103
+        self.gt = None  # type: Optional[Union[int, float]]
+        self.lt = None  # type: Optional[Union[int, float]]
+        self.gte = None  # type: Optional[Union[int, float]]
+        self.lte = None  # type: Optional[Union[int, float]]
+        self.callback = None  # type: Optional[unicode]
+
+        super(Validator, self).__init__(file_name, line, column)
+
+
 class Field(common.SourceLocation):
     """
     An instance of a field in a struct.
@@ -139,6 +163,9 @@ class Field(common.SourceLocation):
         self.serialize_op_msg_request_only = False  # type: bool
         self.constructed = False  # type: bool
 
+        # Validation rules.
+        self.validator = None  # type: Optional[Validator]
+
         super(Field, self).__init__(file_name, line, column)