Schema Parser Tests

* Implement schema parser tests
* Also implement util `ast_to_code` which will convert an AST the python code representation of the AST.

Author: jhgg

graphql/core/language/parser.py

@@ -639,7 +639,7 @@ def parse_scalar_type_definition(parser):
 
 
 def parse_enum_type_definition(parser):
-    start = parser.tokens.start
+    start = parser.token.start
     expect_keyword(parser, 'enum')
 
     return ast.EnumTypeDefinition(

graphql/core/utils/ast_to_code.py

@@ -0,0 +1,47 @@
+from ..language.parser import Loc
+from ..language.ast import Node
+
+
+def ast_to_code(ast, indent=0):
+    """
+    Converts an ast into a python code representation of the AST.
+    """
+    code = []
+    append = lambda line: code.append(('    ' * indent) + line)
+
+    if isinstance(ast, Node):
+        append('ast.{}('.format(ast.__class__.__name__))
+        indent += 1
+        for i, k in enumerate(ast._fields, 1):
+            v = getattr(ast, k)
+            append('{}={},'.format(
+                k,
+                ast_to_code(v, indent),
+            ))
+        if ast.loc:
+            append('loc={}'.format(ast_to_code(ast.loc, indent)))
+
+        indent -= 1
+        append(')')
+
+    elif isinstance(ast, Loc):
+        append('loc({}, {})'.format(ast.start, ast.end))
+
+    elif isinstance(ast, list):
+        if ast:
+            append('[')
+            indent += 1
+
+            for i, it in enumerate(ast, 1):
+                is_last = i == len(ast)
+                append(ast_to_code(it, indent) + (',' if not is_last else ''))
+
+            indent -= 1
+            append(']')
+        else:
+            append('[]')
+
+    else:
+        append(repr(ast))
+
+    return '\n'.join(code).strip()

tests/__init__.py

@@ -44,3 +44,45 @@
   query
 }
 """
+
+SCHEMA_KITCHEN_SINK = """
+
+# Copyright (c) 2015, Facebook, Inc.
+# All rights reserved.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree. An additional grant
+# of patent rights can be found in the PATENTS file in the same directory.
+
+type Foo implements Bar {
+  one: Type
+  two(argument: InputType!): Type
+  three(argument: InputType, other: String): Int
+  four(argument: String = "string"): String
+  five(argument: [String] = ["string", "string"]): String
+  six(argument: InputType = {key: "value"}): Type
+}
+
+interface Bar {
+  one: Type
+  four(argument: String = "string"): String
+}
+
+union Feed = Story | Article | Advert
+
+scalar CustomScalar
+
+enum Site {
+  DESKTOP
+  MOBILE
+}
+
+input InputType {
+  key: String!
+  answer: Int = 42
+}
+
+extend type Foo {
+  seven(argument: [String]): Type
+}
+"""