forked from mirrors/gecko-dev
70 lines
1.8 KiB
Python
70 lines
1.8 KiB
Python
# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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from mozparsers.shared_telemetry_utils import ParserError
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from perfecthash import PerfectHash
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PHFSIZE = 1024
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import sys
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from mozparsers import parse_user_interactions
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banner = """/* This file is auto-generated, see gen_userinteraction_phf.py. */
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"""
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header = """
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#ifndef mozilla_TelemetryUserInteractionNameMap_h
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#define mozilla_TelemetryUserInteractionNameMap_h
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#include "mozilla/PerfectHash.h"
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namespace mozilla {
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namespace Telemetry {
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"""
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footer = """
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} // namespace mozilla
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} // namespace Telemetry
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#endif // mozilla_TelemetryUserInteractionNameMap_h
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"""
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def main(output, *filenames):
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"""
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Generate a Perfect Hash Table for the UserInteraction name -> UserInteraction ID lookup.
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The table is immutable once generated and we can avoid any dynamic memory allocation.
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"""
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output.write(banner)
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output.write(header)
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try:
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user_interactions = list(parse_user_interactions.from_files(filenames))
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except ParserError as ex:
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print("\nError processing UserInteractions:\n" + str(ex) + "\n")
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sys.exit(1)
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user_interactions = [
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(bytearray(ui.label, "ascii"), idx)
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for (idx, ui) in enumerate(user_interactions)
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]
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name_phf = PerfectHash(user_interactions, PHFSIZE)
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output.write(
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name_phf.cxx_codegen(
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name="UserInteractionIDByNameLookup",
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entry_type="uint32_t",
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lower_entry=lambda x: str(x[1]),
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key_type="const nsACString&",
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key_bytes="aKey.BeginReading()",
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key_length="aKey.Length()",
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)
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)
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output.write(footer)
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if __name__ == "__main__":
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main(sys.stdout, *sys.argv[1:])
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