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#!/usr/bin/env python
# Copyright 2013 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.
"""Pretty-prints the histograms.xml file, alphabetizing tags, wrapping text
at 80 chars, enforcing standard attribute ordering, and standardizing
indentation.
This is quite a bit more complicated than just calling tree.toprettyxml();
we need additional customization, like special attribute ordering in tags
and wrapping text nodes, so we implement our own full custom XML pretty-printer.
"""
from __future__ import with_statement
import logging
import os
import shutil
import sys
sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'common'))
import diff_util
import presubmit_util
import etree_util
import histograms_print_style
class Error(Exception):
pass
UNIT_REWRITES = {
'mcs': 'microseconds',
'microsecond': 'microseconds',
'us': 'microseconds',
'millisecond': 'ms',
'milliseconds': 'ms',
'kb': 'KB',
'kB': 'KB',
'kilobytes': 'KB',
'kbits/s': 'kbps',
'mb': 'MB',
'mB': 'MB',
'megabytes': 'MB',
'mbits/s': 'mbps',
'percent': '%',
'Percent': '%',
'percentage': '%',
}
def canonicalizeUnits(tree):
"""Canonicalize the spelling of certain units in histograms."""
if tree.tag == 'histogram':
units = tree.get('units')
if units and units in UNIT_REWRITES:
tree.set('units', UNIT_REWRITES[units])
for child in tree:
canonicalizeUnits(child)
def fixObsoleteOrder(tree):
"""Put obsolete tags at the beginning of histogram tags."""
obsoletes = []
for child in tree:
if child.tag == 'obsolete':
obsoletes.append(child)
else:
fixObsoleteOrder(child)
for obsolete in obsoletes:
tree.remove(obsolete)
# Only keep the first obsolete tag.
if obsoletes:
tree.insert(0, obsoletes[0])
def DropNodesByTagName(tree, tag, dropped_nodes=[]):
"""Drop all nodes with named tag from the XML tree."""
removes = []
for child in tree:
if child.tag == tag:
removes.append(child)
dropped_nodes.append(child)
else:
DropNodesByTagName(child, tag)
for child in removes:
tree.remove(child)
def FixMisplacedHistogramsAndHistogramSuffixes(tree):
"""Fixes misplaced histogram and histogram_suffixes nodes."""
histograms = []
histogram_suffixes = []
def ExtractMisplacedHistograms(tree):
"""Gets and drops misplaced histograms and histogram_suffixes.
Args:
tree: The node of the xml tree.
histograms: A list of histogram nodes inside histogram_suffixes_list
node. This is a return element.
histogram_suffixes: A list of histogram_suffixes nodes inside histograms
node. This is a return element.
"""
for child in tree:
if child.tag == 'histograms':
DropNodesByTagName(child, 'histogram_suffixes', histogram_suffixes)
elif child.tag == 'histogram_suffixes_list':
DropNodesByTagName(child, 'histogram', histograms)
else:
ExtractMisplacedHistograms(child)
ExtractMisplacedHistograms(tree)
def AddBackMisplacedHistograms(tree):
"""Adds back those misplaced histogram and histogram_suffixes nodes."""
for child in tree:
if child.tag == 'histograms':
child.extend(histograms)
elif child.tag == 'histogram_suffixes_list':
child.extend(histogram_suffixes)
else:
AddBackMisplacedHistograms(child)
AddBackMisplacedHistograms(tree)
def PrettyPrintHistograms(raw_xml):
"""Pretty-print the given histograms XML.
Args:
raw_xml: The contents of the histograms XML file, as a string.
Returns:
The pretty-printed version.
"""
top_level_content = etree_util.GetTopLevelContent(raw_xml)
root = etree_util.ParseXMLString(raw_xml)
return top_level_content + PrettyPrintHistogramsTree(root)
def PrettyPrintHistogramsTree(tree):
"""Pretty-print the given ElementTree element.
Args:
tree: The ElementTree element.
Returns:
The pretty-printed version as an XML string.
"""
# Prevent accidentally adding enums to histograms.xml
DropNodesByTagName(tree, 'enums')
FixMisplacedHistogramsAndHistogramSuffixes(tree)
canonicalizeUnits(tree)
fixObsoleteOrder(tree)
return histograms_print_style.GetPrintStyle().PrettyPrintXml(tree)
def PrettyPrintEnums(raw_xml):
"""Pretty print the given enums XML."""
root = etree_util.ParseXMLString(raw_xml)
# Prevent accidentally adding histograms to enums.xml
DropNodesByTagName(root, 'histograms')
DropNodesByTagName(root, 'histogram_suffixes_list')
top_level_content = etree_util.GetTopLevelContent(raw_xml)
formatted_xml = (histograms_print_style.GetPrintStyle()
.PrettyPrintXml(root))
return top_level_content + formatted_xml
def main():
status1 = presubmit_util.DoPresubmit(
sys.argv, 'enums.xml', 'enums.before.pretty-print.xml', PrettyPrintEnums)
status2 = presubmit_util.DoPresubmit(sys.argv, 'histograms.xml',
'histograms.before.pretty-print.xml',
PrettyPrintHistograms)
sys.exit(status1 or status2)
if __name__ == '__main__':
main()
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