Add stub for load() to support Skylark sources that load other .bzl files.

--
MOS_MIGRATED_REVID=124985756

Author: davidzchen

skydoc/macro_extractor_test.py

@@ -395,5 +395,13 @@ def test_file_doc_title_multiline(self):
                        '\n\nDocumentation continued here.',
                        extractor.description)
 
+  def test_loads_ignored(self):
+    src = textwrap.dedent("""\
+      load("//foo/bar:baz.bzl", "foo_library")
+      load("//foo/bar:baz.bzl", "foo_test", orig_foo_binary = "foo_binary")
+      """)
+    expected = ''
+    self.check_protos(src, expected)
+
 if __name__ == '__main__':
   unittest.main()

skydoc/rule_extractor.py

@@ -37,6 +37,7 @@
     "struct": skylark_globals.struct,
     "repository_rule": skylark_globals.repository_rule,
     "rule": skylark_globals.rule,
+    "load": skylark_globals.load,
 }
 """Stubs for Skylark globals to be used to evaluate the .bzl file."""
 

skydoc/rule_extractor_test.py

@@ -504,5 +504,13 @@ def _impl(ctx):
 
     self.check_protos(src, expected)
 
+  def test_loads_ignored(self):
+    src = textwrap.dedent("""\
+      load("//foo/bar:baz.bzl", "foo_library")
+      load("//foo/bar:baz.bzl", "foo_test", orig_foo_binary = "foo_binary")
+      """)
+    expected = ''
+    self.check_protos(src, expected)
+
 if __name__ == '__main__':
   unittest.main()

skydoc/stubs/skylark_globals.py

@@ -36,6 +36,13 @@ def select(x):
 def struct(**kwargs):
   return None
 
+# TODO(dzc): As a future improvement, consider whether we want to evaluate loads
+# in .bzl files and provide links to the rules or macros in the .bzl files
+# being loaded. To do so, we would also have to require that all .bzl
+# dependencies are being included for the skylark_doc target.
+def load(label, *args, **kwargs):
+  return None
+
 class Label(object):
   def __init__(self, label_string):
     self.label_string = label_string