From 6a3693ffd6dcc1702742d23943cecb4686c7aa4c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Aur=C3=A9lien=20=27Bubu=27=20Busi?=
 <aurelien.busi@dailymotion.com>
Date: Tue, 10 Jul 2018 09:19:09 +0200
Subject: [PATCH 1/4] feat(build): Also support python3

---
 CMakeLists.txt                     |   5 +-
 ast/ast.py                         |   7 +
 ast/c_impl_py3.py                  |  61 +++++++++
 ast/c_py3.py                       | 100 +++++++++++++++
 ast/c_visitor_impl_py3.py          |  39 ++++++
 ast/cxx_impl_py3.py                |  61 +++++++++
 ast/cxx_json_visitor_header_py3.py |  42 ++++++
 ast/cxx_json_visitor_impl_py3.py   |  80 ++++++++++++
 ast/cxx_py3.py                     | 197 +++++++++++++++++++++++++++++
 ast/cxx_visitor_py3.py             |  64 ++++++++++
 ast/js_py3.py                      |  65 ++++++++++
 11 files changed, 717 insertions(+), 4 deletions(-)
 create mode 100644 ast/c_impl_py3.py
 create mode 100644 ast/c_py3.py
 create mode 100644 ast/c_visitor_impl_py3.py
 create mode 100644 ast/cxx_impl_py3.py
 create mode 100644 ast/cxx_json_visitor_header_py3.py
 create mode 100644 ast/cxx_json_visitor_impl_py3.py
 create mode 100644 ast/cxx_py3.py
 create mode 100644 ast/cxx_visitor_py3.py
 create mode 100644 ast/js_py3.py

diff --git a/CMakeLists.txt b/CMakeLists.txt
index c4c8b3e..d07a05d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,10 +7,7 @@ INCLUDE(version)
 
 SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
 
-FIND_PACKAGE(PythonInterp 2 REQUIRED)
-IF (NOT PYTHON_VERSION_MAJOR EQUAL 2)
-  MESSAGE(FATAL_ERROR "Python 2 is required.")
-ENDIF()
+FIND_PACKAGE(PythonInterp 2)
 
 FIND_PROGRAM(CTYPESGEN_FOUND ctypesgen.py)
 
diff --git a/ast/ast.py b/ast/ast.py
index dbe539c..99ce1d9 100644
--- a/ast/ast.py
+++ b/ast/ast.py
@@ -54,6 +54,13 @@ def print_ast(lang_module, input_file):
 if __name__ == '__main__':
   import sys
   lang = sys.argv[1]
+
+  try:
+      if sys.version_info >= (3,0):
+        lang = "%s_py3" % lang
+  except:
+      pass
+
   filename = sys.argv[2]
 
   lang_module = load_lang(lang)
diff --git a/ast/c_impl_py3.py b/ast/c_impl_py3.py
new file mode 100644
index 0000000..aa17765
--- /dev/null
+++ b/ast/c_impl_py3.py
@@ -0,0 +1,61 @@
+# Copyright (c) 2015-present, Facebook, Inc.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+from c_py3 import field_prototype, return_type, struct_name
+from casing import title
+from license import C_LICENSE_COMMENT
+
+class Printer(object):
+  '''Printer for the implementation of the pure C interface to the AST.
+  '''
+
+  def __init__(self):
+    self._current_type = None
+
+  def start_file(self):
+    print(C_LICENSE_COMMENT + '''/** @generated */
+
+#include "GraphQLAst.h"
+#include "../Ast.h"
+
+using namespace facebook::graphql::ast;  // NOLINT
+''')
+
+  def end_file(self):
+    pass
+
+  def start_type(self, name):
+    self._current_type = name
+
+  def field(self, type, name, nullable, plural):
+    print(field_prototype(self._current_type, type, name, nullable, plural) + ' {')
+    print('  const auto *realNode = reinterpret_cast<const %s *>(node);' % self._current_type)
+    title_name = title(name)
+    call_get = 'realNode->get%s()' % title_name
+    if plural:
+      if nullable:
+        print('  return %s ? %s->size() : 0;' % (call_get, call_get))
+      else:
+        print('  return %s.size();' % call_get)
+    else:
+      if type in ['string', 'OperationKind', 'boolean']:
+        print('  return %s;' % call_get)
+      else:
+        fmt = '  return reinterpret_cast<const struct %s *>(%s%s);'
+        print(fmt % (struct_name(type), '' if nullable else '&', call_get))
+
+    print('}')
+
+  def end_type(self, name):
+    pass
+
+  def start_union(self, name):
+    pass
+
+  def union_option(self, option):
+    pass
+
+  def end_union(self, name):
+    pass
diff --git a/ast/c_py3.py b/ast/c_py3.py
new file mode 100644
index 0000000..bbcb653
--- /dev/null
+++ b/ast/c_py3.py
@@ -0,0 +1,100 @@
+# Copyright (c) 2015-present, Facebook, Inc.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+from casing import snake
+
+from license import C_LICENSE_COMMENT
+
+def struct_name(type):
+  return 'GraphQLAst' + type
+
+
+def return_type(type):
+  if type == 'OperationKind' or type == 'string':
+    return 'const char *'
+
+  if type == 'boolean':
+    return 'int'
+
+  return 'const struct %s *' % struct_name(type)
+
+
+def field_prototype(owning_type, type, name, nullable, plural):
+  st_name = struct_name(owning_type)
+  if plural:
+    return 'int %s_get_%s_size(const struct %s *node)' % (
+      st_name, snake(name), st_name)
+  else:
+    ret_type = return_type(type)
+    return '%s %s_get_%s(const struct %s *node)' % (
+      ret_type, st_name, snake(name), st_name)
+
+
+class Printer(object):
+  '''Printer for the pure C interface to the AST.
+
+  Merely a set of wrappers around the C++ interface; makes it possible
+  to use the AST from C code and simplifies the task of writing
+  bindings for other langugages.
+
+  The mapping is as follows:
+
+  - For each concrete type, you get an opaque C struct type,
+  accessible only by pointer.
+
+  - For each singular field of a concrete type, you get an accessor
+  function, returning said field in the obvious way.
+
+  - For each plural field of a concrete type, you get an accessor
+  function telling you its size. For access to elements of a plural
+  field, you can use the visitor API.
+
+  - For each union type, you get nothing specific (REVIEW), but you
+    can use the visitor API to work around this entirely.
+
+  '''
+
+  def __init__(self):
+    self._current_type = None
+
+  def start_file(self):
+    print(C_LICENSE_COMMENT + '''/** @generated */
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+''')
+
+  def end_file(self):
+    print('''
+
+#ifdef __cplusplus
+}
+#endif
+''')
+
+  def start_type(self, name):
+    # Forward declarations for AST nodes.
+    st_name = struct_name(name)
+    print('struct ' + st_name + ';')
+    self._current_type = name
+
+  def field(self, type, name, nullable, plural):
+    print(field_prototype(self._current_type, type, name, nullable, plural) + ';')
+
+  def end_type(self, name):
+    print()
+
+  def start_union(self, name):
+    print('struct ' + struct_name(name) + ';')
+
+  def union_option(self, option):
+    pass
+
+  def end_union(self, name):
+    print()
diff --git a/ast/c_visitor_impl_py3.py b/ast/c_visitor_impl_py3.py
new file mode 100644
index 0000000..bbf84f0
--- /dev/null
+++ b/ast/c_visitor_impl_py3.py
@@ -0,0 +1,39 @@
+# Copyright (c) 2015-present, Facebook, Inc.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+from casing import snake
+from license import C_LICENSE_COMMENT
+
+class Printer(object):
+  '''Printer for a simple list of types to be visited by the C visitor.
+  '''
+
+  def __init__(self):
+    self._types = []
+
+  def start_file(self):
+    print(C_LICENSE_COMMENT + '/** @generated */')
+    print('#define FOR_EACH_CONCRETE_TYPE(MACRO) \\')
+
+  def start_type(self, name):
+    self._types.append(name)
+
+  def field(self, type, name, nullable, plural):
+    pass
+
+  def end_type(self, name):
+    pass
+
+  def end_file(self):
+    print(' \\\n'.join('MACRO(%s, %s)' % (name, snake(name)) for name in self._types))
+
+  def start_union(self, name):
+    pass
+
+  def union_option(self, option):
+    pass
+
+  def end_union(self, name):
+    pass
diff --git a/ast/cxx_impl_py3.py b/ast/cxx_impl_py3.py
new file mode 100644
index 0000000..299ed74
--- /dev/null
+++ b/ast/cxx_impl_py3.py
@@ -0,0 +1,61 @@
+# Copyright (c) 2015-present, Facebook, Inc.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+from license import C_LICENSE_COMMENT
+
+class Printer(object):
+  def __init__(self):
+    pass
+
+  def start_file(self):
+    print(C_LICENSE_COMMENT + '''/** @generated */
+
+#include "Ast.h"
+#include "AstVisitor.h"
+
+namespace facebook {
+namespace graphql {
+namespace ast {
+''')
+
+  def end_file(self):
+    print('}  // namespace ast')
+    print('}  // namespace graphql')
+    print('}  // namespace facebook')
+
+  def start_type(self, name):
+    print('''void %s::accept(visitor::AstVisitor *visitor) const {
+  if (visitor->visit%s(*this)) {
+''' % (name, name))
+
+  def field(self, type, name, nullable, plural):
+    if type in ['OperationKind', 'string', 'boolean']:
+      return
+  
+    if plural:
+      accept = '{ for (const auto &x : *%s_) { x->accept(visitor); } }' % name
+      if nullable:
+        accept = 'if (%s_) %s' % (name, accept)
+      print('    ' + accept)
+    else:
+      accept = '%s_->accept(visitor);' % name
+      if nullable:
+        accept = 'if (%s_) { %s }' % (name, accept)
+      print('    ' + accept)
+
+  def end_type(self, name):
+    print('''  }
+  visitor->endVisit%s(*this);
+}
+''' % name)
+
+  def start_union(self, name):
+    pass
+
+  def union_option(self, option):
+    pass
+
+  def end_union(self, name):
+    pass
diff --git a/ast/cxx_json_visitor_header_py3.py b/ast/cxx_json_visitor_header_py3.py
new file mode 100644
index 0000000..8ce7349
--- /dev/null
+++ b/ast/cxx_json_visitor_header_py3.py
@@ -0,0 +1,42 @@
+# Copyright (c) 2016-present, Facebook, Inc.
+# All rights reserved.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+from casing import title
+from license import C_LICENSE_COMMENT
+
+class Printer(object):
+  def __init__(self):
+    self._anyFieldIsANode = False
+
+  def start_file(self):
+    print(C_LICENSE_COMMENT + '/** @generated */')
+
+  def end_file(self):
+    pass
+
+  def start_type(self, name):
+    self._anyFieldIsANode = False
+
+  def end_type(self, name):
+    titleName = title(name)
+    if self._anyFieldIsANode:
+      print('bool visit%s(const %s &node) override;' % (titleName, titleName))
+    print('void endVisit%s(const %s &node) override;' % (titleName, titleName))
+    print()
+
+  def field(self, type, name, nullable, plural):
+    if (not self._anyFieldIsANode and
+        type not in ('OperationKind', 'string', 'boolean')):
+      self._anyFieldIsANode = True
+
+  def start_union(self, name):
+    pass
+
+  def union_option(self, option):
+    pass
+
+  def end_union(self, name):
+    pass
diff --git a/ast/cxx_json_visitor_impl_py3.py b/ast/cxx_json_visitor_impl_py3.py
new file mode 100644
index 0000000..c96efdf
--- /dev/null
+++ b/ast/cxx_json_visitor_impl_py3.py
@@ -0,0 +1,80 @@
+# Copyright (c) 2016-present, Facebook, Inc.
+# All rights reserved.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+from casing import title
+from license import C_LICENSE_COMMENT
+
+class Printer(object):
+  def __init__(self):
+    self._fields = []
+
+  def start_file(self):
+    print(C_LICENSE_COMMENT + '/** @generated */')
+
+  def end_file(self):
+    pass
+
+  def start_type(self, name):
+    self._fields = []
+
+  def field(self, type, name, nullable, plural):
+    if type == 'OperationKind':
+      type = 'string'
+    self._fields.append((type, name, nullable, plural))
+
+  def end_type(self, name):
+    titleName = title(name)
+    anyFieldIsANode = any(type not in ('string, boolean')
+                          for (type, _, _ ,_) in self._fields)
+    if anyFieldIsANode:
+      print('''bool JsonVisitor::visit%s(const %s &node) {
+  visitNode();
+  return true;
+}
+''' % (titleName, titleName))
+    print('''void JsonVisitor::endVisit%(tn)s(const %(tn)s &node) {
+  NodeFieldPrinter fields(*this, "%(tn)s", node);''' % {'tn': titleName})
+
+    for (type, fieldName, nullable, plural) in self._fields:
+      funcName = None
+      if type == 'string':
+        assert not plural, 'plural string fields not supported yet'
+        funcName = 'printSingularPrimitiveField'
+      elif type == 'boolean':
+        assert not plural, 'plural boolean fields not supported yet'
+        funcName = 'printSingularBooleanField'
+      elif not nullable and not plural:
+        # Special case: singular object fields don't need the value passed.
+        print('  fields.printSingularObjectField("%s");' % fieldName)
+        continue
+      else:
+        nullable_str = 'Nullable' if nullable else ''
+        plural_str = 'Plural' if plural else 'SingularObject'
+        funcName = 'print%s%sField' % (nullable_str, plural_str)
+
+      assert funcName is not None
+      print('  fields.%s("%s", node.get%s());' % (
+        funcName, fieldName, title(fieldName)))
+
+    if anyFieldIsANode:
+      print('''
+  endVisitNode(fields.finishPrinting());
+}
+''')
+    else:
+      print('''
+  printed_.back().emplace_back(fields.finishPrinting());
+}
+''')
+
+  def start_union(self, name):
+    pass
+
+  def union_option(self, option):
+    pass
+
+  def end_union(self, name):
+    pass
diff --git a/ast/cxx_py3.py b/ast/cxx_py3.py
new file mode 100644
index 0000000..cd868be
--- /dev/null
+++ b/ast/cxx_py3.py
@@ -0,0 +1,197 @@
+# Copyright (c) 2015-present, Facebook, Inc.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+import io as StringIO
+
+from casing import title
+from license import C_LICENSE_COMMENT
+
+class Printer(object):
+  def __init__(self):
+    self._type_name = None
+    # Map concrete type to base class
+    self._bases = {}
+    # HACK: Defer everything we print so that forward declarations for
+    # all classes come first. Avoids having to do 2 passes over the
+    # input file.
+    self._deferredOutput = StringIO.StringIO()
+
+    self._fields = []
+
+  def start_file(self):
+    print(C_LICENSE_COMMENT + '''/** @generated */
+#pragma once
+
+#include "AstNode.h"
+
+#include <memory>
+#include <string>
+#include <utility>
+#include <vector>
+
+namespace facebook {
+namespace graphql {
+namespace ast {
+
+// The parser uses strdup to move from yytext to the heap, so we need
+// to use free instead of delete.
+struct CDeleter {
+  void operator()(const char *p) const { free((void *)p); }
+};
+''')
+
+  def end_file(self):
+    print()
+    print(self._deferredOutput.getvalue())
+    print('}')
+    print('}')
+    print('}')
+
+  def _base_class(self, type):
+    return self._bases.get(type, 'Node')
+
+  def start_type(self, name):
+    self._type_name = name
+    base = self._base_class(name)
+    # non-deferred!
+    print('class %s;' % name)
+    print('class %s : public %s {' % (name, base), file=self._deferredOutput)
+    self._fields = []
+
+  def field(self, type, name, nullable, plural):
+    if type == 'OperationKind':
+      type = 'string'
+    self._fields.append((type, name, nullable, plural))
+
+  def end_type(self, name):
+    self._print_fields()
+    print(' public:', file=self._deferredOutput)
+    self._print_constructor()
+    print(file=self._deferredOutput)
+    self._print_destructor_prototype()
+    print(file=self._deferredOutput)
+    self._print_noncopyable()
+    print(file=self._deferredOutput)
+    self._print_getters()
+    print('  void accept(visitor::AstVisitor *visitor) const override;', file=self._deferredOutput)
+    print('};', file=self._deferredOutput)
+    print(file=self._deferredOutput)
+    print(file=self._deferredOutput)
+    self._type_name = None
+    self._fields = []
+
+  def _storage_type(self, type):
+    if type == 'string':
+      return 'std::unique_ptr<const char, CDeleter>'
+    elif type == 'boolean':
+      return 'bool'
+    else:
+      return 'std::unique_ptr<%s>' % type
+
+  def _print_fields(self):
+    for (type, name, nullable, plural) in self._fields:
+      storage_type = self._storage_type(type)
+      if plural:
+        storage_type = 'std::unique_ptr<std::vector<%s>>' % storage_type
+      print('  %s %s_;' % (storage_type, name), file=self._deferredOutput)
+
+  def _ctor_singular_type(self, type):
+    if type == 'string':
+      return 'const char *'
+    elif type == 'boolean':
+      return 'bool'
+    else:
+      return '%s *' % type
+
+  def _ctor_plural_type(self, type):
+    return 'std::vector<%s> *' % self._storage_type(type)
+
+  def _print_constructor(self):
+    print('  explicit %s(' % self._type_name, file=self._deferredOutput)
+    print('      const yy::location &location%s' % (',' if self._fields else ''), file=self._deferredOutput)
+    def ctor_arg(type, name, plural):
+      if plural:
+        ctor_type = self._ctor_plural_type(type)
+      else:
+        ctor_type = self._ctor_singular_type(type)
+      return '      %s %s' % (ctor_type, name)
+    print(',\n'.join(ctor_arg(type, name, plural)
+                     for (type, name, nullable, plural) in self._fields), file=self._deferredOutput)
+    print('  )', file=self._deferredOutput)
+    def ctor_init(type, name, plural):
+      # Strings are const char *, just pass.
+      # Vectors are passed by pointer and we take ownership.
+      # Node types are passed in by pointer and we take ownership.
+      value = name
+      return '    %s_(%s)' % (name, value)
+    print('  : %s(location)%s' % (self._base_class(self._type_name), ',' if self._fields else ''), file=self._deferredOutput)
+    print(',\n'.join(ctor_init(type, name, plural)
+                     for (type, name, nullable, plural)
+                     in self._fields), file=self._deferredOutput)
+    print('  {}', file=self._deferredOutput)
+
+  def _getter_type(self, type, nullable, plural):
+    if plural and nullable:
+      return 'const std::vector<%s>*' % self._storage_type(type)
+    elif plural:
+      return 'const std::vector<%s>&' %  self._storage_type(type)
+
+    if type == 'string':
+      assert not nullable
+      return 'const char *'
+    elif type == 'boolean':
+      assert not nullable
+      return 'bool'
+    elif nullable:
+      return 'const %s*' % type
+    else:
+      return 'const %s&' % type
+
+  def _getter_value_to_return(self, raw_value, type, nullable, plural):
+    if plural and nullable:
+      return raw_value + '.get()'
+    elif plural:
+      return '*%s' % raw_value
+    elif type == 'boolean':
+      return raw_value
+    elif nullable or type == 'string':
+      return '%s.get()' % raw_value
+    else:
+      return '*%s' % raw_value
+
+  def _print_getters(self):
+    for (type, name, nullable, plural) in self._fields:
+      print('  %s get%s() const' % (
+        self._getter_type(type, nullable, plural),
+        title(name)), file=self._deferredOutput)
+      print('  { return %s; }' % (
+        self._getter_value_to_return(name + '_', type, nullable, plural)), file=self._deferredOutput)
+      print(file=self._deferredOutput)
+
+  def _print_destructor_prototype(self):
+    print('  ~%s() {}' % self._type_name, file=self._deferredOutput)
+
+  def _print_noncopyable(self):
+    print('  %s(const %s&) = delete;' % (
+      self._type_name, self._type_name), file=self._deferredOutput)
+    print('  %s& operator=(const %s&) = delete;' % (
+      self._type_name, self._type_name), file=self._deferredOutput)
+  
+  def start_union(self, name):
+    self._type_name = name
+    # non-deferred!
+    print('class %s;' % name)
+    print('class %s : public Node {' % name, file=self._deferredOutput)
+    print(' public:', file=self._deferredOutput)
+    self._print_constructor()
+    print('};', file=self._deferredOutput)
+    print(file=self._deferredOutput)
+
+  def union_option(self, type):
+    assert type not in self._bases, '%s cannot appear in more than one union!' % type
+    self._bases[type] = self._type_name
+
+  def end_union(self, name):
+    pass
diff --git a/ast/cxx_visitor_py3.py b/ast/cxx_visitor_py3.py
new file mode 100644
index 0000000..ac15cae
--- /dev/null
+++ b/ast/cxx_visitor_py3.py
@@ -0,0 +1,64 @@
+# Copyright (c) 2015-present, Facebook, Inc.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+from casing import camel, title
+from license import C_LICENSE_COMMENT
+
+class Printer(object):
+  def __init__(self):
+    pass
+
+  def start_file(self):
+    print(C_LICENSE_COMMENT + '''/** @generated */
+
+#pragma once
+
+#include "Ast.h"
+
+namespace facebook {
+namespace graphql {
+namespace ast {
+namespace visitor {
+
+class AstVisitor {
+public:
+  virtual ~AstVisitor() {}
+''')
+
+  def end_file(self):
+    print('};') # end AstVisitor
+    print()
+    print('}')
+    print('}')
+    print('}')
+    print('}')
+
+  def start_type(self, name):
+    titleName = title(name)
+    camelName = camel(titleName)
+    print('  virtual bool visit%s(const %s &%s) { return true; }' % (
+      titleName,
+      titleName,
+      camelName))
+    print('  virtual void endVisit%s(const %s &%s) { }' % (
+      titleName,
+      titleName,
+      camelName))
+    print()
+
+  def end_type(self, name):
+    pass
+
+  def field(self, type, name, nullable, plural):
+    pass
+
+  def start_union(self, name):
+    pass
+
+  def union_option(self, option):
+    pass
+
+  def end_union(self, name):
+    pass
diff --git a/ast/js_py3.py b/ast/js_py3.py
new file mode 100644
index 0000000..68aee6e
--- /dev/null
+++ b/ast/js_py3.py
@@ -0,0 +1,65 @@
+# Copyright (c) 2015-present, Facebook, Inc.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+
+class Printer(object):
+  def __init__(self):
+    pass
+
+  def start_file(self):
+    print('''/* @flow */
+/* @generated */
+/* jshint ignore:start */
+
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+type Node = {
+  kind: string;
+  start?: ?number;
+  end?: ?number;
+};
+
+type OperationKind = 'query' | 'mutation' | 'subscription';''')
+
+  def end_file(self):
+    pass
+
+  def start_type(self, name):
+    print()
+    print('type %s = Node & {' % name)
+    kind = name
+    if kind == 'GenericType':
+      kind = 'Type'
+    print('  kind: \'%s\';' % kind)
+
+  def end_type(self, name):
+    print('}')
+
+  def _js_type(self, type, plural):
+    if plural:
+      type = 'Array<%s>' % type
+    return type
+
+  def field(self, type, name, nullable, plural):
+    nullable_char = '?' if nullable else ''
+    js_type = self._js_type(type, plural)
+    print('  %(name)s%(nullable_char)s: %(nullable_char)s%(js_type)s;' % locals())
+
+  def start_union(self, name):
+    print(('type %s = ' % name), end=' ')
+    self._current_options = []
+
+  def union_option(self, type):
+    self._current_options.append(type)
+
+  def end_union(self, name):
+    print('\n  | '.join(self._current_options))
+    print()
+    self._current_options = None

From f42c7bc6564e66253348058e8c66696d3b6e9dd7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Aur=C3=A9lien=20=27Bubu=27=20Busi?=
 <aurelien.busi@dailymotion.com>
Date: Tue, 10 Jul 2018 09:42:28 +0200
Subject: [PATCH 2/4] fix(ident): fix mismatch identation.

---
 ast/ast.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/ast/ast.py b/ast/ast.py
index 99ce1d9..39c6471 100644
--- a/ast/ast.py
+++ b/ast/ast.py
@@ -56,10 +56,10 @@ def print_ast(lang_module, input_file):
   lang = sys.argv[1]
 
   try:
-      if sys.version_info >= (3,0):
-        lang = "%s_py3" % lang
+    if sys.version_info >= (3,0):
+      lang = "%s_py3" % lang
   except:
-      pass
+    pass
 
   filename = sys.argv[2]
 

From 3e6d39401b23889615eaecfa8ae98fe3cd0f04df Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Aur=C3=A9lien=20=27Bubu=27=20Busi?=
 <aurelien.busi@dailymotion.com>
Date: Thu, 6 Sep 2018 10:47:50 +0200
Subject: [PATCH 3/4] Make ast python code usable in python2 or python3

---
 ast/ast.py                         |   8 +-
 ast/c.py                           |  20 +--
 ast/c_impl.py                      |  19 +--
 ast/c_impl_py3.py                  |  61 ---------
 ast/c_py3.py                       | 100 ---------------
 ast/c_visitor_impl.py              |   8 +-
 ast/c_visitor_impl_py3.py          |  39 ------
 ast/cxx.py                         |  93 +++++++-------
 ast/cxx_impl.py                    |  26 ++--
 ast/cxx_impl_py3.py                |  61 ---------
 ast/cxx_json_visitor_header.py     |  10 +-
 ast/cxx_json_visitor_header_py3.py |  42 ------
 ast/cxx_json_visitor_impl.py       |  26 ++--
 ast/cxx_json_visitor_impl_py3.py   |  80 ------------
 ast/cxx_py3.py                     | 197 -----------------------------
 ast/cxx_visitor.py                 |  28 ++--
 ast/cxx_visitor_py3.py             |  64 ----------
 ast/js.py                          |  22 ++--
 ast/js_py3.py                      |  65 ----------
 19 files changed, 129 insertions(+), 840 deletions(-)
 delete mode 100644 ast/c_impl_py3.py
 delete mode 100644 ast/c_py3.py
 delete mode 100644 ast/c_visitor_impl_py3.py
 delete mode 100644 ast/cxx_impl_py3.py
 delete mode 100644 ast/cxx_json_visitor_header_py3.py
 delete mode 100644 ast/cxx_json_visitor_impl_py3.py
 delete mode 100644 ast/cxx_py3.py
 delete mode 100644 ast/cxx_visitor_py3.py
 delete mode 100644 ast/js_py3.py

diff --git a/ast/ast.py b/ast/ast.py
index 39c6471..1ba028e 100644
--- a/ast/ast.py
+++ b/ast/ast.py
@@ -53,14 +53,8 @@ def print_ast(lang_module, input_file):
   lang_module.end_file()
 if __name__ == '__main__':
   import sys
-  lang = sys.argv[1]
-
-  try:
-    if sys.version_info >= (3,0):
-      lang = "%s_py3" % lang
-  except:
-    pass
 
+  lang = sys.argv[1]
   filename = sys.argv[2]
 
   lang_module = load_lang(lang)
diff --git a/ast/c.py b/ast/c.py
index 836a67d..5d2b6ac 100644
--- a/ast/c.py
+++ b/ast/c.py
@@ -2,7 +2,7 @@
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
-
+from __future__ import print_function
 from casing import snake
 
 from license import C_LICENSE_COMMENT
@@ -60,7 +60,7 @@ def __init__(self):
     self._current_type = None
 
   def start_file(self):
-    print C_LICENSE_COMMENT + '''/** @generated */
+    print(C_LICENSE_COMMENT + '''/** @generated */
 
 #pragma once
 
@@ -68,33 +68,33 @@ def start_file(self):
 extern "C" {
 #endif
 
-'''
+''')
 
   def end_file(self):
-    print '''
+    print('''
 
 #ifdef __cplusplus
 }
 #endif
-'''
+''')
 
   def start_type(self, name):
     # Forward declarations for AST nodes.
     st_name = struct_name(name)
-    print 'struct ' + st_name + ';'
+    print('struct ' + st_name + ';')
     self._current_type = name
 
   def field(self, type, name, nullable, plural):
-    print field_prototype(self._current_type, type, name, nullable, plural) + ';'
+    print(field_prototype(self._current_type, type, name, nullable, plural) + ';')
 
   def end_type(self, name):
-    print
+    print()
 
   def start_union(self, name):
-    print 'struct ' + struct_name(name) + ';'
+    print('struct ' + struct_name(name) + ';')
 
   def union_option(self, option):
     pass
 
   def end_union(self, name):
-    print
+    print()
diff --git a/ast/c_impl.py b/ast/c_impl.py
index 5ff3c30..bfc1d68 100644
--- a/ast/c_impl.py
+++ b/ast/c_impl.py
@@ -2,6 +2,7 @@
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
+from __future__ import print_function
 
 from c import field_prototype, return_type, struct_name
 from casing import title
@@ -15,13 +16,13 @@ def __init__(self):
     self._current_type = None
 
   def start_file(self):
-    print C_LICENSE_COMMENT + '''/** @generated */
+    print(C_LICENSE_COMMENT + '''/** @generated */
 
 #include "GraphQLAst.h"
 #include "../Ast.h"
 
 using namespace facebook::graphql::ast;  // NOLINT
-'''
+''')
 
   def end_file(self):
     pass
@@ -30,23 +31,23 @@ def start_type(self, name):
     self._current_type = name
 
   def field(self, type, name, nullable, plural):
-    print field_prototype(self._current_type, type, name, nullable, plural) + ' {'
-    print '  const auto *realNode = reinterpret_cast<const %s *>(node);' % self._current_type
+    print(field_prototype(self._current_type, type, name, nullable, plural) + ' {')
+    print('  const auto *realNode = reinterpret_cast<const %s *>(node);' % self._current_type)
     title_name = title(name)
     call_get = 'realNode->get%s()' % title_name
     if plural:
       if nullable:
-        print '  return %s ? %s->size() : 0;' % (call_get, call_get)
+        print('  return %s ? %s->size() : 0;' % (call_get, call_get))
       else:
-        print '  return %s.size();' % call_get
+        print('  return %s.size();' % call_get)
     else:
       if type in ['string', 'OperationKind', 'boolean']:
-        print '  return %s;' % call_get
+        print('  return %s;' % call_get)
       else:
         fmt = '  return reinterpret_cast<const struct %s *>(%s%s);'
-        print fmt % (struct_name(type), '' if nullable else '&', call_get)
+        print(fmt % (struct_name(type), '' if nullable else '&', call_get))
 
-    print '}'
+    print('}')
 
   def end_type(self, name):
     pass
diff --git a/ast/c_impl_py3.py b/ast/c_impl_py3.py
deleted file mode 100644
index aa17765..0000000
--- a/ast/c_impl_py3.py
+++ /dev/null
@@ -1,61 +0,0 @@
-# Copyright (c) 2015-present, Facebook, Inc.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-from c_py3 import field_prototype, return_type, struct_name
-from casing import title
-from license import C_LICENSE_COMMENT
-
-class Printer(object):
-  '''Printer for the implementation of the pure C interface to the AST.
-  '''
-
-  def __init__(self):
-    self._current_type = None
-
-  def start_file(self):
-    print(C_LICENSE_COMMENT + '''/** @generated */
-
-#include "GraphQLAst.h"
-#include "../Ast.h"
-
-using namespace facebook::graphql::ast;  // NOLINT
-''')
-
-  def end_file(self):
-    pass
-
-  def start_type(self, name):
-    self._current_type = name
-
-  def field(self, type, name, nullable, plural):
-    print(field_prototype(self._current_type, type, name, nullable, plural) + ' {')
-    print('  const auto *realNode = reinterpret_cast<const %s *>(node);' % self._current_type)
-    title_name = title(name)
-    call_get = 'realNode->get%s()' % title_name
-    if plural:
-      if nullable:
-        print('  return %s ? %s->size() : 0;' % (call_get, call_get))
-      else:
-        print('  return %s.size();' % call_get)
-    else:
-      if type in ['string', 'OperationKind', 'boolean']:
-        print('  return %s;' % call_get)
-      else:
-        fmt = '  return reinterpret_cast<const struct %s *>(%s%s);'
-        print(fmt % (struct_name(type), '' if nullable else '&', call_get))
-
-    print('}')
-
-  def end_type(self, name):
-    pass
-
-  def start_union(self, name):
-    pass
-
-  def union_option(self, option):
-    pass
-
-  def end_union(self, name):
-    pass
diff --git a/ast/c_py3.py b/ast/c_py3.py
deleted file mode 100644
index bbcb653..0000000
--- a/ast/c_py3.py
+++ /dev/null
@@ -1,100 +0,0 @@
-# Copyright (c) 2015-present, Facebook, Inc.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-from casing import snake
-
-from license import C_LICENSE_COMMENT
-
-def struct_name(type):
-  return 'GraphQLAst' + type
-
-
-def return_type(type):
-  if type == 'OperationKind' or type == 'string':
-    return 'const char *'
-
-  if type == 'boolean':
-    return 'int'
-
-  return 'const struct %s *' % struct_name(type)
-
-
-def field_prototype(owning_type, type, name, nullable, plural):
-  st_name = struct_name(owning_type)
-  if plural:
-    return 'int %s_get_%s_size(const struct %s *node)' % (
-      st_name, snake(name), st_name)
-  else:
-    ret_type = return_type(type)
-    return '%s %s_get_%s(const struct %s *node)' % (
-      ret_type, st_name, snake(name), st_name)
-
-
-class Printer(object):
-  '''Printer for the pure C interface to the AST.
-
-  Merely a set of wrappers around the C++ interface; makes it possible
-  to use the AST from C code and simplifies the task of writing
-  bindings for other langugages.
-
-  The mapping is as follows:
-
-  - For each concrete type, you get an opaque C struct type,
-  accessible only by pointer.
-
-  - For each singular field of a concrete type, you get an accessor
-  function, returning said field in the obvious way.
-
-  - For each plural field of a concrete type, you get an accessor
-  function telling you its size. For access to elements of a plural
-  field, you can use the visitor API.
-
-  - For each union type, you get nothing specific (REVIEW), but you
-    can use the visitor API to work around this entirely.
-
-  '''
-
-  def __init__(self):
-    self._current_type = None
-
-  def start_file(self):
-    print(C_LICENSE_COMMENT + '''/** @generated */
-
-#pragma once
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-''')
-
-  def end_file(self):
-    print('''
-
-#ifdef __cplusplus
-}
-#endif
-''')
-
-  def start_type(self, name):
-    # Forward declarations for AST nodes.
-    st_name = struct_name(name)
-    print('struct ' + st_name + ';')
-    self._current_type = name
-
-  def field(self, type, name, nullable, plural):
-    print(field_prototype(self._current_type, type, name, nullable, plural) + ';')
-
-  def end_type(self, name):
-    print()
-
-  def start_union(self, name):
-    print('struct ' + struct_name(name) + ';')
-
-  def union_option(self, option):
-    pass
-
-  def end_union(self, name):
-    print()
diff --git a/ast/c_visitor_impl.py b/ast/c_visitor_impl.py
index aac56b2..ff91a30 100644
--- a/ast/c_visitor_impl.py
+++ b/ast/c_visitor_impl.py
@@ -2,7 +2,7 @@
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
-
+from __future__ import print_function
 from casing import snake
 from license import C_LICENSE_COMMENT
 
@@ -14,8 +14,8 @@ def __init__(self):
     self._types = []
 
   def start_file(self):
-    print C_LICENSE_COMMENT + '/** @generated */'
-    print '#define FOR_EACH_CONCRETE_TYPE(MACRO) \\'
+    print(C_LICENSE_COMMENT + '/** @generated */')
+    print('#define FOR_EACH_CONCRETE_TYPE(MACRO) \\')
 
   def start_type(self, name):
     self._types.append(name)
@@ -27,7 +27,7 @@ def end_type(self, name):
     pass
 
   def end_file(self):
-    print ' \\\n'.join('MACRO(%s, %s)' % (name, snake(name)) for name in self._types)
+    print(' \\\n'.join('MACRO(%s, %s)' % (name, snake(name)) for name in self._types))
 
   def start_union(self, name):
     pass
diff --git a/ast/c_visitor_impl_py3.py b/ast/c_visitor_impl_py3.py
deleted file mode 100644
index bbf84f0..0000000
--- a/ast/c_visitor_impl_py3.py
+++ /dev/null
@@ -1,39 +0,0 @@
-# Copyright (c) 2015-present, Facebook, Inc.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-from casing import snake
-from license import C_LICENSE_COMMENT
-
-class Printer(object):
-  '''Printer for a simple list of types to be visited by the C visitor.
-  '''
-
-  def __init__(self):
-    self._types = []
-
-  def start_file(self):
-    print(C_LICENSE_COMMENT + '/** @generated */')
-    print('#define FOR_EACH_CONCRETE_TYPE(MACRO) \\')
-
-  def start_type(self, name):
-    self._types.append(name)
-
-  def field(self, type, name, nullable, plural):
-    pass
-
-  def end_type(self, name):
-    pass
-
-  def end_file(self):
-    print(' \\\n'.join('MACRO(%s, %s)' % (name, snake(name)) for name in self._types))
-
-  def start_union(self, name):
-    pass
-
-  def union_option(self, option):
-    pass
-
-  def end_union(self, name):
-    pass
diff --git a/ast/cxx.py b/ast/cxx.py
index 81a1bf5..aa0f9c1 100644
--- a/ast/cxx.py
+++ b/ast/cxx.py
@@ -2,8 +2,11 @@
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
-
-import cStringIO as StringIO
+from __future__ import print_function
+try:
+    import cStringIO as StringIO
+except ImportError:
+    import io as StringIO
 
 from casing import title
 from license import C_LICENSE_COMMENT
@@ -21,7 +24,7 @@ def __init__(self):
     self._fields = []
 
   def start_file(self):
-    print C_LICENSE_COMMENT + '''/** @generated */
+    print(C_LICENSE_COMMENT + '''/** @generated */
 #pragma once
 
 #include "AstNode.h"
@@ -40,14 +43,14 @@ def start_file(self):
 struct CDeleter {
   void operator()(const char *p) const { free((void *)p); }
 };
-'''
+''')
 
   def end_file(self):
-    print
-    print self._deferredOutput.getvalue()
-    print '}'
-    print '}'
-    print '}'
+    print()
+    print(self._deferredOutput.getvalue())
+    print('}')
+    print('}')
+    print('}')
 
   def _base_class(self, type):
     return self._bases.get(type, 'Node')
@@ -56,8 +59,8 @@ def start_type(self, name):
     self._type_name = name
     base = self._base_class(name)
     # non-deferred!
-    print 'class %s;' % name
-    print >> self._deferredOutput, 'class %s : public %s {' % (name, base)
+    print('class %s;' % name)
+    print('class %s : public %s {' % (name, base), file=self._deferredOutput)
     self._fields = []
 
   def field(self, type, name, nullable, plural):
@@ -67,18 +70,18 @@ def field(self, type, name, nullable, plural):
 
   def end_type(self, name):
     self._print_fields()
-    print >> self._deferredOutput, ' public:'
+    print(' public:', file=self._deferredOutput)
     self._print_constructor()
-    print >> self._deferredOutput
+    print(file=self._deferredOutput)
     self._print_destructor_prototype()
-    print >> self._deferredOutput
+    print(file=self._deferredOutput)
     self._print_noncopyable()
-    print >> self._deferredOutput
+    print(file=self._deferredOutput)
     self._print_getters()
-    print >> self._deferredOutput, '  void accept(visitor::AstVisitor *visitor) const override;'
-    print >> self._deferredOutput, '};'
-    print >> self._deferredOutput
-    print >> self._deferredOutput
+    print('  void accept(visitor::AstVisitor *visitor) const override;', file=self._deferredOutput)
+    print('};', file=self._deferredOutput)
+    print(file=self._deferredOutput)
+    print(file=self._deferredOutput)
     self._type_name = None
     self._fields = []
 
@@ -95,7 +98,7 @@ def _print_fields(self):
       storage_type = self._storage_type(type)
       if plural:
         storage_type = 'std::unique_ptr<std::vector<%s>>' % storage_type
-      print >> self._deferredOutput, '  %s %s_;' % (storage_type, name)
+      print('  %s %s_;' % (storage_type, name), file=self._deferredOutput)
 
   def _ctor_singular_type(self, type):
     if type == 'string':
@@ -109,28 +112,28 @@ def _ctor_plural_type(self, type):
     return 'std::vector<%s> *' % self._storage_type(type)
 
   def _print_constructor(self):
-    print >> self._deferredOutput, '  explicit %s(' % self._type_name
-    print >> self._deferredOutput, '      const yy::location &location%s' % (',' if self._fields else '')
+    print('  explicit %s(' % self._type_name, file=self._deferredOutput)
+    print('      const yy::location &location%s' % (',' if self._fields else ''), file=self._deferredOutput)
     def ctor_arg(type, name, plural):
       if plural:
         ctor_type = self._ctor_plural_type(type)
       else:
         ctor_type = self._ctor_singular_type(type)
       return '      %s %s' % (ctor_type, name)
-    print >> self._deferredOutput, ',\n'.join(ctor_arg(type, name, plural)
-                     for (type, name, nullable, plural) in self._fields)
-    print >> self._deferredOutput, '  )'
+    print(',\n'.join(ctor_arg(type, name, plural)
+                     for (type, name, nullable, plural) in self._fields), file=self._deferredOutput)
+    print('  )', file=self._deferredOutput)
     def ctor_init(type, name, plural):
       # Strings are const char *, just pass.
       # Vectors are passed by pointer and we take ownership.
       # Node types are passed in by pointer and we take ownership.
       value = name
       return '    %s_(%s)' % (name, value)
-    print >> self._deferredOutput, '  : %s(location)%s' % (self._base_class(self._type_name), ',' if self._fields else '')
-    print >> self._deferredOutput, ',\n'.join(ctor_init(type, name, plural)
+    print('  : %s(location)%s' % (self._base_class(self._type_name), ',' if self._fields else ''), file=self._deferredOutput)
+    print(',\n'.join(ctor_init(type, name, plural)
                      for (type, name, nullable, plural)
-                     in self._fields)
-    print >> self._deferredOutput, '  {}'
+                     in self._fields), file=self._deferredOutput)
+    print('  {}', file=self._deferredOutput)
 
   def _getter_type(self, type, nullable, plural):
     if plural and nullable:
@@ -163,31 +166,31 @@ def _getter_value_to_return(self, raw_value, type, nullable, plural):
 
   def _print_getters(self):
     for (type, name, nullable, plural) in self._fields:
-      print >> self._deferredOutput, '  %s get%s() const' % (
+      print('  %s get%s() const' % (
         self._getter_type(type, nullable, plural),
-        title(name))
-      print >> self._deferredOutput, '  { return %s; }' % (
-        self._getter_value_to_return(name + '_', type, nullable, plural))
-      print >> self._deferredOutput
+        title(name)), file=self._deferredOutput)
+      print('  { return %s; }' % (
+        self._getter_value_to_return(name + '_', type, nullable, plural)), file=self._deferredOutput)
+      print(file=self._deferredOutput)
 
   def _print_destructor_prototype(self):
-    print >> self._deferredOutput, '  ~%s() {}' % self._type_name
+    print('  ~%s() {}' % self._type_name, file=self._deferredOutput)
 
   def _print_noncopyable(self):
-    print >> self._deferredOutput, '  %s(const %s&) = delete;' % (
-      self._type_name, self._type_name)
-    print >> self._deferredOutput, '  %s& operator=(const %s&) = delete;' % (
-      self._type_name, self._type_name)
-  
+    print('  %s(const %s&) = delete;' % (
+      self._type_name, self._type_name), file=self._deferredOutput)
+    print('  %s& operator=(const %s&) = delete;' % (
+      self._type_name, self._type_name), file=self._deferredOutput)
+
   def start_union(self, name):
     self._type_name = name
     # non-deferred!
-    print 'class %s;' % name
-    print >> self._deferredOutput, 'class %s : public Node {' % name
-    print >> self._deferredOutput, ' public:'
+    print('class %s;' % name)
+    print('class %s : public Node {' % name, file=self._deferredOutput)
+    print(' public:', file=self._deferredOutput)
     self._print_constructor()
-    print >> self._deferredOutput, '};'
-    print >> self._deferredOutput
+    print('};', file=self._deferredOutput)
+    print(file=self._deferredOutput)
 
   def union_option(self, type):
     assert type not in self._bases, '%s cannot appear in more than one union!' % type
diff --git a/ast/cxx_impl.py b/ast/cxx_impl.py
index 7f1b989..60ea325 100644
--- a/ast/cxx_impl.py
+++ b/ast/cxx_impl.py
@@ -2,7 +2,7 @@
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
-
+from __future__ import print_function
 from license import C_LICENSE_COMMENT
 
 class Printer(object):
@@ -10,7 +10,7 @@ def __init__(self):
     pass
 
   def start_file(self):
-    print C_LICENSE_COMMENT + '''/** @generated */
+    print(C_LICENSE_COMMENT + '''/** @generated */
 
 #include "Ast.h"
 #include "AstVisitor.h"
@@ -18,38 +18,38 @@ def start_file(self):
 namespace facebook {
 namespace graphql {
 namespace ast {
-'''
+''')
 
   def end_file(self):
-    print '}  // namespace ast'
-    print '}  // namespace graphql'
-    print '}  // namespace facebook'
+    print('}  // namespace ast')
+    print('}  // namespace graphql')
+    print('}  // namespace facebook')
 
   def start_type(self, name):
-    print '''void %s::accept(visitor::AstVisitor *visitor) const {
+    print('''void %s::accept(visitor::AstVisitor *visitor) const {
   if (visitor->visit%s(*this)) {
-''' % (name, name)
+''' % (name, name))
 
   def field(self, type, name, nullable, plural):
     if type in ['OperationKind', 'string', 'boolean']:
       return
-  
+
     if plural:
       accept = '{ for (const auto &x : *%s_) { x->accept(visitor); } }' % name
       if nullable:
         accept = 'if (%s_) %s' % (name, accept)
-      print '    ' + accept
+      print('    ' + accept)
     else:
       accept = '%s_->accept(visitor);' % name
       if nullable:
         accept = 'if (%s_) { %s }' % (name, accept)
-      print '    ' + accept
+      print('    ' + accept)
 
   def end_type(self, name):
-    print '''  }
+    print('''  }
   visitor->endVisit%s(*this);
 }
-''' % name
+''' % name)
 
   def start_union(self, name):
     pass
diff --git a/ast/cxx_impl_py3.py b/ast/cxx_impl_py3.py
deleted file mode 100644
index 299ed74..0000000
--- a/ast/cxx_impl_py3.py
+++ /dev/null
@@ -1,61 +0,0 @@
-# Copyright (c) 2015-present, Facebook, Inc.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-from license import C_LICENSE_COMMENT
-
-class Printer(object):
-  def __init__(self):
-    pass
-
-  def start_file(self):
-    print(C_LICENSE_COMMENT + '''/** @generated */
-
-#include "Ast.h"
-#include "AstVisitor.h"
-
-namespace facebook {
-namespace graphql {
-namespace ast {
-''')
-
-  def end_file(self):
-    print('}  // namespace ast')
-    print('}  // namespace graphql')
-    print('}  // namespace facebook')
-
-  def start_type(self, name):
-    print('''void %s::accept(visitor::AstVisitor *visitor) const {
-  if (visitor->visit%s(*this)) {
-''' % (name, name))
-
-  def field(self, type, name, nullable, plural):
-    if type in ['OperationKind', 'string', 'boolean']:
-      return
-  
-    if plural:
-      accept = '{ for (const auto &x : *%s_) { x->accept(visitor); } }' % name
-      if nullable:
-        accept = 'if (%s_) %s' % (name, accept)
-      print('    ' + accept)
-    else:
-      accept = '%s_->accept(visitor);' % name
-      if nullable:
-        accept = 'if (%s_) { %s }' % (name, accept)
-      print('    ' + accept)
-
-  def end_type(self, name):
-    print('''  }
-  visitor->endVisit%s(*this);
-}
-''' % name)
-
-  def start_union(self, name):
-    pass
-
-  def union_option(self, option):
-    pass
-
-  def end_union(self, name):
-    pass
diff --git a/ast/cxx_json_visitor_header.py b/ast/cxx_json_visitor_header.py
index 2f8a02a..0e37679 100644
--- a/ast/cxx_json_visitor_header.py
+++ b/ast/cxx_json_visitor_header.py
@@ -3,7 +3,7 @@
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
-
+from __future__ import print_function
 from casing import title
 from license import C_LICENSE_COMMENT
 
@@ -12,7 +12,7 @@ def __init__(self):
     self._anyFieldIsANode = False
 
   def start_file(self):
-    print C_LICENSE_COMMENT + '/** @generated */'
+    print(C_LICENSE_COMMENT + '/** @generated */')
 
   def end_file(self):
     pass
@@ -23,9 +23,9 @@ def start_type(self, name):
   def end_type(self, name):
     titleName = title(name)
     if self._anyFieldIsANode:
-      print 'bool visit%s(const %s &node) override;' % (titleName, titleName)
-    print 'void endVisit%s(const %s &node) override;' % (titleName, titleName)
-    print
+      print('bool visit%s(const %s &node) override;' % (titleName, titleName))
+    print('void endVisit%s(const %s &node) override;' % (titleName, titleName))
+    print()
 
   def field(self, type, name, nullable, plural):
     if (not self._anyFieldIsANode and
diff --git a/ast/cxx_json_visitor_header_py3.py b/ast/cxx_json_visitor_header_py3.py
deleted file mode 100644
index 8ce7349..0000000
--- a/ast/cxx_json_visitor_header_py3.py
+++ /dev/null
@@ -1,42 +0,0 @@
-# Copyright (c) 2016-present, Facebook, Inc.
-# All rights reserved.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-from casing import title
-from license import C_LICENSE_COMMENT
-
-class Printer(object):
-  def __init__(self):
-    self._anyFieldIsANode = False
-
-  def start_file(self):
-    print(C_LICENSE_COMMENT + '/** @generated */')
-
-  def end_file(self):
-    pass
-
-  def start_type(self, name):
-    self._anyFieldIsANode = False
-
-  def end_type(self, name):
-    titleName = title(name)
-    if self._anyFieldIsANode:
-      print('bool visit%s(const %s &node) override;' % (titleName, titleName))
-    print('void endVisit%s(const %s &node) override;' % (titleName, titleName))
-    print()
-
-  def field(self, type, name, nullable, plural):
-    if (not self._anyFieldIsANode and
-        type not in ('OperationKind', 'string', 'boolean')):
-      self._anyFieldIsANode = True
-
-  def start_union(self, name):
-    pass
-
-  def union_option(self, option):
-    pass
-
-  def end_union(self, name):
-    pass
diff --git a/ast/cxx_json_visitor_impl.py b/ast/cxx_json_visitor_impl.py
index db8f9ab..91d2548 100644
--- a/ast/cxx_json_visitor_impl.py
+++ b/ast/cxx_json_visitor_impl.py
@@ -3,7 +3,7 @@
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
-
+from __future__ import print_function
 from casing import title
 from license import C_LICENSE_COMMENT
 
@@ -12,7 +12,7 @@ def __init__(self):
     self._fields = []
 
   def start_file(self):
-    print C_LICENSE_COMMENT + '/** @generated */'
+    print(C_LICENSE_COMMENT + '/** @generated */')
 
   def end_file(self):
     pass
@@ -30,13 +30,13 @@ def end_type(self, name):
     anyFieldIsANode = any(type not in ('string, boolean')
                           for (type, _, _ ,_) in self._fields)
     if anyFieldIsANode:
-      print '''bool JsonVisitor::visit%s(const %s &node) {
+      print('''bool JsonVisitor::visit%s(const %s &node) {
   visitNode();
   return true;
 }
-''' % (titleName, titleName)
-    print '''void JsonVisitor::endVisit%(tn)s(const %(tn)s &node) {
-  NodeFieldPrinter fields(*this, "%(tn)s", node);''' % {'tn': titleName}
+''' % (titleName, titleName))
+    print('''void JsonVisitor::endVisit%(tn)s(const %(tn)s &node) {
+  NodeFieldPrinter fields(*this, "%(tn)s", node);''' % {'tn': titleName})
 
     for (type, fieldName, nullable, plural) in self._fields:
       funcName = None
@@ -48,7 +48,7 @@ def end_type(self, name):
         funcName = 'printSingularBooleanField'
       elif not nullable and not plural:
         # Special case: singular object fields don't need the value passed.
-        print '  fields.printSingularObjectField("%s");' % fieldName
+        print('  fields.printSingularObjectField("%s");' % fieldName)
         continue
       else:
         nullable_str = 'Nullable' if nullable else ''
@@ -56,19 +56,19 @@ def end_type(self, name):
         funcName = 'print%s%sField' % (nullable_str, plural_str)
 
       assert funcName is not None
-      print '  fields.%s("%s", node.get%s());' % (
-        funcName, fieldName, title(fieldName))
+      print('  fields.%s("%s", node.get%s());' % (
+        funcName, fieldName, title(fieldName)))
 
     if anyFieldIsANode:
-      print '''
+      print('''
   endVisitNode(fields.finishPrinting());
 }
-'''
+''')
     else:
-      print '''
+      print('''
   printed_.back().emplace_back(fields.finishPrinting());
 }
-'''
+''')
 
   def start_union(self, name):
     pass
diff --git a/ast/cxx_json_visitor_impl_py3.py b/ast/cxx_json_visitor_impl_py3.py
deleted file mode 100644
index c96efdf..0000000
--- a/ast/cxx_json_visitor_impl_py3.py
+++ /dev/null
@@ -1,80 +0,0 @@
-# Copyright (c) 2016-present, Facebook, Inc.
-# All rights reserved.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-from casing import title
-from license import C_LICENSE_COMMENT
-
-class Printer(object):
-  def __init__(self):
-    self._fields = []
-
-  def start_file(self):
-    print(C_LICENSE_COMMENT + '/** @generated */')
-
-  def end_file(self):
-    pass
-
-  def start_type(self, name):
-    self._fields = []
-
-  def field(self, type, name, nullable, plural):
-    if type == 'OperationKind':
-      type = 'string'
-    self._fields.append((type, name, nullable, plural))
-
-  def end_type(self, name):
-    titleName = title(name)
-    anyFieldIsANode = any(type not in ('string, boolean')
-                          for (type, _, _ ,_) in self._fields)
-    if anyFieldIsANode:
-      print('''bool JsonVisitor::visit%s(const %s &node) {
-  visitNode();
-  return true;
-}
-''' % (titleName, titleName))
-    print('''void JsonVisitor::endVisit%(tn)s(const %(tn)s &node) {
-  NodeFieldPrinter fields(*this, "%(tn)s", node);''' % {'tn': titleName})
-
-    for (type, fieldName, nullable, plural) in self._fields:
-      funcName = None
-      if type == 'string':
-        assert not plural, 'plural string fields not supported yet'
-        funcName = 'printSingularPrimitiveField'
-      elif type == 'boolean':
-        assert not plural, 'plural boolean fields not supported yet'
-        funcName = 'printSingularBooleanField'
-      elif not nullable and not plural:
-        # Special case: singular object fields don't need the value passed.
-        print('  fields.printSingularObjectField("%s");' % fieldName)
-        continue
-      else:
-        nullable_str = 'Nullable' if nullable else ''
-        plural_str = 'Plural' if plural else 'SingularObject'
-        funcName = 'print%s%sField' % (nullable_str, plural_str)
-
-      assert funcName is not None
-      print('  fields.%s("%s", node.get%s());' % (
-        funcName, fieldName, title(fieldName)))
-
-    if anyFieldIsANode:
-      print('''
-  endVisitNode(fields.finishPrinting());
-}
-''')
-    else:
-      print('''
-  printed_.back().emplace_back(fields.finishPrinting());
-}
-''')
-
-  def start_union(self, name):
-    pass
-
-  def union_option(self, option):
-    pass
-
-  def end_union(self, name):
-    pass
diff --git a/ast/cxx_py3.py b/ast/cxx_py3.py
deleted file mode 100644
index cd868be..0000000
--- a/ast/cxx_py3.py
+++ /dev/null
@@ -1,197 +0,0 @@
-# Copyright (c) 2015-present, Facebook, Inc.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-import io as StringIO
-
-from casing import title
-from license import C_LICENSE_COMMENT
-
-class Printer(object):
-  def __init__(self):
-    self._type_name = None
-    # Map concrete type to base class
-    self._bases = {}
-    # HACK: Defer everything we print so that forward declarations for
-    # all classes come first. Avoids having to do 2 passes over the
-    # input file.
-    self._deferredOutput = StringIO.StringIO()
-
-    self._fields = []
-
-  def start_file(self):
-    print(C_LICENSE_COMMENT + '''/** @generated */
-#pragma once
-
-#include "AstNode.h"
-
-#include <memory>
-#include <string>
-#include <utility>
-#include <vector>
-
-namespace facebook {
-namespace graphql {
-namespace ast {
-
-// The parser uses strdup to move from yytext to the heap, so we need
-// to use free instead of delete.
-struct CDeleter {
-  void operator()(const char *p) const { free((void *)p); }
-};
-''')
-
-  def end_file(self):
-    print()
-    print(self._deferredOutput.getvalue())
-    print('}')
-    print('}')
-    print('}')
-
-  def _base_class(self, type):
-    return self._bases.get(type, 'Node')
-
-  def start_type(self, name):
-    self._type_name = name
-    base = self._base_class(name)
-    # non-deferred!
-    print('class %s;' % name)
-    print('class %s : public %s {' % (name, base), file=self._deferredOutput)
-    self._fields = []
-
-  def field(self, type, name, nullable, plural):
-    if type == 'OperationKind':
-      type = 'string'
-    self._fields.append((type, name, nullable, plural))
-
-  def end_type(self, name):
-    self._print_fields()
-    print(' public:', file=self._deferredOutput)
-    self._print_constructor()
-    print(file=self._deferredOutput)
-    self._print_destructor_prototype()
-    print(file=self._deferredOutput)
-    self._print_noncopyable()
-    print(file=self._deferredOutput)
-    self._print_getters()
-    print('  void accept(visitor::AstVisitor *visitor) const override;', file=self._deferredOutput)
-    print('};', file=self._deferredOutput)
-    print(file=self._deferredOutput)
-    print(file=self._deferredOutput)
-    self._type_name = None
-    self._fields = []
-
-  def _storage_type(self, type):
-    if type == 'string':
-      return 'std::unique_ptr<const char, CDeleter>'
-    elif type == 'boolean':
-      return 'bool'
-    else:
-      return 'std::unique_ptr<%s>' % type
-
-  def _print_fields(self):
-    for (type, name, nullable, plural) in self._fields:
-      storage_type = self._storage_type(type)
-      if plural:
-        storage_type = 'std::unique_ptr<std::vector<%s>>' % storage_type
-      print('  %s %s_;' % (storage_type, name), file=self._deferredOutput)
-
-  def _ctor_singular_type(self, type):
-    if type == 'string':
-      return 'const char *'
-    elif type == 'boolean':
-      return 'bool'
-    else:
-      return '%s *' % type
-
-  def _ctor_plural_type(self, type):
-    return 'std::vector<%s> *' % self._storage_type(type)
-
-  def _print_constructor(self):
-    print('  explicit %s(' % self._type_name, file=self._deferredOutput)
-    print('      const yy::location &location%s' % (',' if self._fields else ''), file=self._deferredOutput)
-    def ctor_arg(type, name, plural):
-      if plural:
-        ctor_type = self._ctor_plural_type(type)
-      else:
-        ctor_type = self._ctor_singular_type(type)
-      return '      %s %s' % (ctor_type, name)
-    print(',\n'.join(ctor_arg(type, name, plural)
-                     for (type, name, nullable, plural) in self._fields), file=self._deferredOutput)
-    print('  )', file=self._deferredOutput)
-    def ctor_init(type, name, plural):
-      # Strings are const char *, just pass.
-      # Vectors are passed by pointer and we take ownership.
-      # Node types are passed in by pointer and we take ownership.
-      value = name
-      return '    %s_(%s)' % (name, value)
-    print('  : %s(location)%s' % (self._base_class(self._type_name), ',' if self._fields else ''), file=self._deferredOutput)
-    print(',\n'.join(ctor_init(type, name, plural)
-                     for (type, name, nullable, plural)
-                     in self._fields), file=self._deferredOutput)
-    print('  {}', file=self._deferredOutput)
-
-  def _getter_type(self, type, nullable, plural):
-    if plural and nullable:
-      return 'const std::vector<%s>*' % self._storage_type(type)
-    elif plural:
-      return 'const std::vector<%s>&' %  self._storage_type(type)
-
-    if type == 'string':
-      assert not nullable
-      return 'const char *'
-    elif type == 'boolean':
-      assert not nullable
-      return 'bool'
-    elif nullable:
-      return 'const %s*' % type
-    else:
-      return 'const %s&' % type
-
-  def _getter_value_to_return(self, raw_value, type, nullable, plural):
-    if plural and nullable:
-      return raw_value + '.get()'
-    elif plural:
-      return '*%s' % raw_value
-    elif type == 'boolean':
-      return raw_value
-    elif nullable or type == 'string':
-      return '%s.get()' % raw_value
-    else:
-      return '*%s' % raw_value
-
-  def _print_getters(self):
-    for (type, name, nullable, plural) in self._fields:
-      print('  %s get%s() const' % (
-        self._getter_type(type, nullable, plural),
-        title(name)), file=self._deferredOutput)
-      print('  { return %s; }' % (
-        self._getter_value_to_return(name + '_', type, nullable, plural)), file=self._deferredOutput)
-      print(file=self._deferredOutput)
-
-  def _print_destructor_prototype(self):
-    print('  ~%s() {}' % self._type_name, file=self._deferredOutput)
-
-  def _print_noncopyable(self):
-    print('  %s(const %s&) = delete;' % (
-      self._type_name, self._type_name), file=self._deferredOutput)
-    print('  %s& operator=(const %s&) = delete;' % (
-      self._type_name, self._type_name), file=self._deferredOutput)
-  
-  def start_union(self, name):
-    self._type_name = name
-    # non-deferred!
-    print('class %s;' % name)
-    print('class %s : public Node {' % name, file=self._deferredOutput)
-    print(' public:', file=self._deferredOutput)
-    self._print_constructor()
-    print('};', file=self._deferredOutput)
-    print(file=self._deferredOutput)
-
-  def union_option(self, type):
-    assert type not in self._bases, '%s cannot appear in more than one union!' % type
-    self._bases[type] = self._type_name
-
-  def end_union(self, name):
-    pass
diff --git a/ast/cxx_visitor.py b/ast/cxx_visitor.py
index 91aa0b5..cbbfbc0 100644
--- a/ast/cxx_visitor.py
+++ b/ast/cxx_visitor.py
@@ -2,7 +2,7 @@
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
-
+from __future__ import print_function
 from casing import camel, title
 from license import C_LICENSE_COMMENT
 
@@ -11,7 +11,7 @@ def __init__(self):
     pass
 
   def start_file(self):
-    print C_LICENSE_COMMENT + '''/** @generated */
+    print(C_LICENSE_COMMENT + '''/** @generated */
 
 #pragma once
 
@@ -25,28 +25,28 @@ def start_file(self):
 class AstVisitor {
 public:
   virtual ~AstVisitor() {}
-'''
+''')
 
   def end_file(self):
-    print '};' # end AstVisitor
-    print
-    print '}'
-    print '}'
-    print '}'
-    print '}'
+    print('};') # end AstVisitor
+    print()
+    print('}')
+    print('}')
+    print('}')
+    print('}')
 
   def start_type(self, name):
     titleName = title(name)
     camelName = camel(titleName)
-    print '  virtual bool visit%s(const %s &%s) { return true; }' % (
+    print('  virtual bool visit%s(const %s &%s) { return true; }' % (
       titleName,
       titleName,
-      camelName)
-    print '  virtual void endVisit%s(const %s &%s) { }' % (
+      camelName))
+    print('  virtual void endVisit%s(const %s &%s) { }' % (
       titleName,
       titleName,
-      camelName)
-    print
+      camelName))
+    print()
 
   def end_type(self, name):
     pass
diff --git a/ast/cxx_visitor_py3.py b/ast/cxx_visitor_py3.py
deleted file mode 100644
index ac15cae..0000000
--- a/ast/cxx_visitor_py3.py
+++ /dev/null
@@ -1,64 +0,0 @@
-# Copyright (c) 2015-present, Facebook, Inc.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-from casing import camel, title
-from license import C_LICENSE_COMMENT
-
-class Printer(object):
-  def __init__(self):
-    pass
-
-  def start_file(self):
-    print(C_LICENSE_COMMENT + '''/** @generated */
-
-#pragma once
-
-#include "Ast.h"
-
-namespace facebook {
-namespace graphql {
-namespace ast {
-namespace visitor {
-
-class AstVisitor {
-public:
-  virtual ~AstVisitor() {}
-''')
-
-  def end_file(self):
-    print('};') # end AstVisitor
-    print()
-    print('}')
-    print('}')
-    print('}')
-    print('}')
-
-  def start_type(self, name):
-    titleName = title(name)
-    camelName = camel(titleName)
-    print('  virtual bool visit%s(const %s &%s) { return true; }' % (
-      titleName,
-      titleName,
-      camelName))
-    print('  virtual void endVisit%s(const %s &%s) { }' % (
-      titleName,
-      titleName,
-      camelName))
-    print()
-
-  def end_type(self, name):
-    pass
-
-  def field(self, type, name, nullable, plural):
-    pass
-
-  def start_union(self, name):
-    pass
-
-  def union_option(self, option):
-    pass
-
-  def end_union(self, name):
-    pass
diff --git a/ast/js.py b/ast/js.py
index cb6c023..143d828 100644
--- a/ast/js.py
+++ b/ast/js.py
@@ -3,13 +3,13 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-
+from __future__ import print_function
 class Printer(object):
   def __init__(self):
     pass
 
   def start_file(self):
-    print '''/* @flow */
+    print('''/* @flow */
 /* @generated */
 /* jshint ignore:start */
 
@@ -26,21 +26,21 @@ def start_file(self):
   end?: ?number;
 };
 
-type OperationKind = 'query' | 'mutation' | 'subscription';'''
+type OperationKind = 'query' | 'mutation' | 'subscription';''')
 
   def end_file(self):
     pass
 
   def start_type(self, name):
-    print
-    print 'type %s = Node & {' % name
+    print()
+    print('type %s = Node & {' % name)
     kind = name
     if kind == 'GenericType':
       kind = 'Type'
-    print '  kind: \'%s\';' % kind
+    print('  kind: \'%s\';' % kind)
 
   def end_type(self, name):
-    print '}'
+    print('}')
 
   def _js_type(self, type, plural):
     if plural:
@@ -50,16 +50,16 @@ def _js_type(self, type, plural):
   def field(self, type, name, nullable, plural):
     nullable_char = '?' if nullable else ''
     js_type = self._js_type(type, plural)
-    print '  %(name)s%(nullable_char)s: %(nullable_char)s%(js_type)s;' % locals()
+    print('  %(name)s%(nullable_char)s: %(nullable_char)s%(js_type)s;' % locals())
 
   def start_union(self, name):
-    print ('type %s = ' % name),
+    print(('type %s = ' % name), end=' ')
     self._current_options = []
 
   def union_option(self, type):
     self._current_options.append(type)
 
   def end_union(self, name):
-    print '\n  | '.join(self._current_options)
-    print
+    print('\n  | '.join(self._current_options))
+    print()
     self._current_options = None
diff --git a/ast/js_py3.py b/ast/js_py3.py
deleted file mode 100644
index 68aee6e..0000000
--- a/ast/js_py3.py
+++ /dev/null
@@ -1,65 +0,0 @@
-# Copyright (c) 2015-present, Facebook, Inc.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-
-class Printer(object):
-  def __init__(self):
-    pass
-
-  def start_file(self):
-    print('''/* @flow */
-/* @generated */
-/* jshint ignore:start */
-
-/**
- * Copyright (c) 2015-present, Facebook, Inc.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-type Node = {
-  kind: string;
-  start?: ?number;
-  end?: ?number;
-};
-
-type OperationKind = 'query' | 'mutation' | 'subscription';''')
-
-  def end_file(self):
-    pass
-
-  def start_type(self, name):
-    print()
-    print('type %s = Node & {' % name)
-    kind = name
-    if kind == 'GenericType':
-      kind = 'Type'
-    print('  kind: \'%s\';' % kind)
-
-  def end_type(self, name):
-    print('}')
-
-  def _js_type(self, type, plural):
-    if plural:
-      type = 'Array<%s>' % type
-    return type
-
-  def field(self, type, name, nullable, plural):
-    nullable_char = '?' if nullable else ''
-    js_type = self._js_type(type, plural)
-    print('  %(name)s%(nullable_char)s: %(nullable_char)s%(js_type)s;' % locals())
-
-  def start_union(self, name):
-    print(('type %s = ' % name), end=' ')
-    self._current_options = []
-
-  def union_option(self, type):
-    self._current_options.append(type)
-
-  def end_union(self, name):
-    print('\n  | '.join(self._current_options))
-    print()
-    self._current_options = None

From b5e381f67c04147fbbbc014db37298d2fb1510ea Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Aur=C3=A9lien=20Busi?= <aurelien.busi@dailymotion.com>
Date: Wed, 28 Aug 2019 13:54:23 +0200
Subject: [PATCH 4/4] Update to the latest of libgraphql parser

---
 parser.ypp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/parser.ypp b/parser.ypp
index 591e885..b425926 100644
--- a/parser.ypp
+++ b/parser.ypp
@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-%require "3"
+/* %require "3" */
 
 %skeleton "lalr1.cc"
 
@@ -278,7 +278,7 @@ union yystype {                                         \
 %type <typeNameList> union_members;
 %type <fieldDefinition> field_definition;
 %type <fieldDefinitionList> field_definition_list;
-%type <inputValueDefinitionList> arguments_definition_opt; 
+%type <inputValueDefinitionList> arguments_definition_opt;
 %type <inputValueDefinitionList> arguments_definition;
 %type <inputValueDefinitionList> input_value_definition_list;
 %type <inputValueDefinition> input_value_definition;
@@ -333,7 +333,7 @@ name_opt:
 
 document:       definition_list { $$ = new Document(@$, $1); }
         ;
-                
+
 definition_list:definition { $$ = new std::vector<std::unique_ptr<Definition>>(); $$->emplace_back($1); }
         |       definition_list definition { $1->emplace_back($2); $$ = $1; }
         ;