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# Copyright 2017 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Objects for describing template code that can be generated from ukm.xml."""
import hashlib
import os
import re
import struct
def sanitize_name(name):
s = re.sub('[^0-9a-zA-Z_]', '_', name)
return s
def HashName(name):
# This must match the hash function in base/metrics/metric_hashes.cc
# >Q: 8 bytes, big endian.
return struct.unpack('>Q', hashlib.md5(name).digest()[:8])[0]
class FileInfo(object):
def __init__(self, relpath, basename):
self.dir_path = relpath
self.guard_path = sanitize_name(os.path.join(relpath, basename)).upper()
class EventInfo(object):
def __init__(self, json_obj):
self.raw_name = json_obj['name']
self.name = sanitize_name(json_obj['name'])
self.hash = HashName(json_obj['name'])
class MetricInfo(object):
def __init__(self, json_obj):
self.raw_name = json_obj['name']
self.name = sanitize_name(json_obj['name'])
self.hash = HashName(json_obj['name'])
class Template(object):
"""Template for producing code from ukm.xml."""
def __init__(self, basename, file_template, event_template, metric_template):
self.basename = basename
self.file_template = file_template
self.event_template = event_template
self.metric_template = metric_template
def _StampMetricCode(self, file_info, event_info, metric):
return self.metric_template.format(
file=file_info,
event=event_info,
metric=MetricInfo(metric))
def _StampEventCode(self, file_info, event):
event_info = EventInfo(event)
metric_code = "".join(self._StampMetricCode(file_info, event_info, metric)
for metric in event['metrics'])
return self.event_template.format(
file=file_info,
event=event_info,
metric_code=metric_code)
def _StampFileCode(self, relpath, data):
file_info = FileInfo(relpath, self.basename)
event_code = "".join(self._StampEventCode(file_info, event)
for event in data['events'])
return self.file_template.format(
file=file_info,
event_code=event_code)
def WriteFile(self, outdir, relpath, data):
"""Generates code and writes it to a file.
Args:
relpath: The path to the file in the source tree.
rootdir: The root of the path the file should be written to.
data: The parsed ukm.xml data.
"""
output = open(os.path.join(outdir, self.basename), 'w')
output.write(self._StampFileCode(relpath, data))
output.close()
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