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