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-rw-r--r--absl/copts/generate_copts.py107
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diff --git a/absl/copts/generate_copts.py b/absl/copts/generate_copts.py
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+"""Generate Abseil compile compile option configs.
+
+Usage: python absl/generate_copts.py
+
+The configs are generated from copts.py.
+"""
+
+from os import path
+import sys
+from copts import COPT_VARS
+
+
+# Helper functions
+def file_header_lines():
+ return [
+ "GENERATED! DO NOT MANUALLY EDIT THIS FILE.", "",
+ "(1) Edit absl/copts/copts.py.",
+ "(2) Run `python <path_to_absl>/copts/generate_copts.py`."
+ ]
+
+
+def flatten(*lists):
+ return [item for sublist in lists for item in sublist]
+
+
+def relative_filename(filename):
+ return path.join(path.dirname(__file__), filename)
+
+
+# Style classes. These contain all the syntactic styling needed to generate a
+# copt file for different build tools.
+class CMakeStyle(object):
+ """Style object for CMake copts file."""
+
+ def separator(self):
+ return ""
+
+ def list_introducer(self, name):
+ return "list(APPEND " + name
+
+ def list_closer(self):
+ return ")\n"
+
+ def docstring(self):
+ return "\n".join((("# " + line).strip() for line in file_header_lines()))
+
+ def filename(self):
+ return "GENERATED_AbseilCopts.cmake"
+
+
+class StarlarkStyle(object):
+ """Style object for Starlark copts file."""
+
+ def separator(self):
+ return ","
+
+ def list_introducer(self, name):
+ return name + " = ["
+
+ def list_closer(self):
+ return "]\n"
+
+ def docstring(self):
+ docstring_quotes = "\"\"\""
+ return docstring_quotes + "\n".join(
+ flatten(file_header_lines(), [docstring_quotes]))
+
+ def filename(self):
+ return "GENERATED_copts.bzl"
+
+
+# Copt file generation
+def copt_list(name, arg_list, style):
+ make_line = lambda s: " \"" + s + "\"" + style.separator()
+ external_str_list = [make_line(s) for s in arg_list]
+
+ return "\n".join(
+ flatten(
+ [style.list_introducer(name)],
+ external_str_list,
+ [style.list_closer()]))
+
+
+def generate_copt_file(style):
+ """Creates a generated copt file using the given style object.
+
+ Args:
+ style: either StarlarkStyle() or CMakeStyle()
+ """
+ with open(relative_filename(style.filename()), "w") as f:
+ f.write(style.docstring())
+ f.write("\n")
+ for var_name, arg_list in sorted(COPT_VARS.items()):
+ f.write("\n")
+ f.write(copt_list(var_name, arg_list, style))
+
+
+def main(argv):
+ if len(argv) > 1:
+ raise RuntimeError("generate_copts needs no command line args")
+
+ generate_copt_file(StarlarkStyle())
+ generate_copt_file(CMakeStyle())
+
+
+if __name__ == "__main__":
+ main(sys.argv)