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#!/usr/bin/env python3
# Copyright 2014 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Scans the Chromium source of UseCounter, formats the Feature enum for
histograms.xml and merges it. This script can also generate a python code
snippet to put in uma.py of Chromium Dashboard. Make sure that you review the
output for correctness.
"""
import optparse
import os
import re
import sys
sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'common'))
import path_util
import update_histogram_enum
USE_COUNTER_MOJOM_PATH = 'third_party/blink/public/mojom/use_counter/'\
'metrics/css_property_id.mojom'
def EnumToCssProperty(enum_name):
"""Converts a camel cased enum name to the lower case CSS property."""
# The first group also searches for uppercase letters to account for single
# uppercase letters, such as in "ZIndex" that need to convert to "z-index".
# Special case total page measured for backward compat.
if enum_name == "TotalPagesMeasured":
return "Total Pages Measured"
return re.sub(r'([a-zA-Z])([A-Z])', r'\1-\2', enum_name).lower()
def ReadCssProperties(filename):
# Read the file as a list of lines
with open(path_util.GetInputFile(filename)) as f:
content = f.readlines()
# Looking for a single line like "kFontWeight = 10,"
ENUM_REGEX = re.compile(r"""k(\w+)\s*= # capture the enum name
\s*(\d+),? # capture the id
""", re.VERBOSE)
properties = {}
for line in content:
enum_match = ENUM_REGEX.search(line)
if enum_match:
enum_name = enum_match.group(1)
property_id = int(enum_match.group(2))
# Properties with id = 0 are invalid. Skip them.
if property_id == 0:
continue
label = EnumToCssProperty(enum_name)
if line.strip().startswith('//'):
label += ' (obsolete)'
properties[property_id] = label
return properties
if __name__ == '__main__':
update_histogram_enum.UpdateHistogramFromDict(
'tools/metrics/histograms/metadata/blink/enums.xml',
'MappedCSSProperties', ReadCssProperties(USE_COUNTER_MOJOM_PATH),
USE_COUNTER_MOJOM_PATH, os.path.basename(__file__))
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