Add Ruby-specific tools

synthtool/languages/ruby.py

@@ -0,0 +1,51 @@
+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from pathlib import Path
+import re
+from typing import Iterable, Union
+
+import synthtool
+
+PathOrStr = Union[str, Path]
+ListOfPathsOrStrs = Iterable[PathOrStr]
+
+
+def merge_gemspec(src: str, dest: str, path: Path):
+    """Merge function for ruby gemspecs.
+
+    Args:
+        src: Source gemspec content from gapic
+        dest: Destination gemspec content
+        path: Destination gemspec path
+
+    Returns:
+        The merged gemspec content.
+    """
+    version_re = re.compile(r'^\s+gem.version\s*=\s*"[\d\.]+"$', flags=re.MULTILINE)
+    match = version_re.search(dest)
+    if match:
+        return version_re.sub(match.group(0), src, count=1)
+    else:
+        return src
+
+def delete_method(sources: ListOfPathsOrStrs, method_name: str):
+    """Deletes a Ruby method, including the leading comment if any.
+
+    Args:
+        sources: Source file or list of files
+        method_name: Name of the method to delete
+    """
+    regex = f'\\n\\n(\\s+#[^\\n]*\\n)*\\n*(\\s+)def\\s+{method_name}[^\\n]+\\n+(\\2\\s\\s[^\\n]+\\n+)*\\2end\\n'
+    synthtool.replace(sources, regex, '\n')