tools/warn/warn_common.py

# python3
# Copyright (C) 2019 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Grep warnings messages and output HTML tables or warning counts in CSV.

Default is to output warnings in HTML tables grouped by warning severity.
Use option --byproject to output tables grouped by source file projects.
Use option --gencsv to output warning counts in CSV format.
"""

# List of important data structures and functions in this script.
#
# To parse and keep warning message in the input file:
#   severity:                classification of message severity
#   warn_patterns:
#   warn_patterns[w]['category']     tool that issued the warning, not used now
#   warn_patterns[w]['description']  table heading
#   warn_patterns[w]['members']      matched warnings from input
#   warn_patterns[w]['patterns']     regular expressions to match warnings
#   warn_patterns[w]['projects'][p]  number of warnings of pattern w in p
#   warn_patterns[w]['severity']     severity tuple
#   project_list[p][0]               project name
#   project_list[p][1]               regular expression to match a project path
#   project_patterns[p]              re.compile(project_list[p][1])
#   project_names[p]                 project_list[p][0]
#   warning_messages     array of each warning message, without source url
#   warning_records      array of [idx to warn_patterns,
#                                  idx to project_names,
#                                  idx to warning_messages]
#   android_root
#   platform_version
#   target_product
#   target_variant
#   parse_input_file
#
# To emit html page of warning messages:
#   flags: --byproject, --url, --separator
# Old stuff for static html components:
#   html_script_style:  static html scripts and styles
#   htmlbig:
#   dump_stats, dump_html_prologue, dump_html_epilogue:
#   emit_buttons:
#   dump_fixed
#   sort_warnings:
#   emit_stats_by_project:
#   all_patterns,
#   findproject, classify_warning
#   dump_html
#
# New dynamic HTML page's static JavaScript data:
#   Some data are copied from Python to JavaScript, to generate HTML elements.
#   FlagURL                args.url
#   FlagSeparator          args.separator
#   SeverityColors:        list of colors for all severity levels
#   SeverityHeaders:       list of headers for all severity levels
#   SeverityColumnHeaders: list of column_headers for all severity levels
#   ProjectNames:          project_names, or project_list[*][0]
#   WarnPatternsSeverity:     warn_patterns[*]['severity']
#   WarnPatternsDescription:  warn_patterns[*]['description']
#   WarningMessages:          warning_messages
#   Warnings:                 warning_records
#   StatsHeader:           warning count table header row
#   StatsRows:             array of warning count table rows
#
# New dynamic HTML page's dynamic JavaScript data:
#
# New dynamic HTML related function to emit data:
#   escape_string, strip_escape_string, emit_warning_arrays
#   emit_js_data():

from __future__ import print_function
import argparse
import cgi
import csv
import io
import multiprocessing
import os
import re
import signal
import sys

# pylint:disable=relative-beyond-top-level
from . import cpp_warn_patterns
from . import java_warn_patterns
from . import make_warn_patterns
from . import other_warn_patterns
from . import tidy_warn_patterns
# pylint:disable=g-importing-member
from .android_project_list import project_list
from .severity import Severity

parser = argparse.ArgumentParser(description='Convert a build log into HTML')
parser.add_argument('--csvpath',
                    help='Save CSV warning file to the passed absolute path',
                    default=None)
parser.add_argument('--gencsv',
                    help='Generate a CSV file with number of various warnings',
                    action='store_true',
                    default=False)
parser.add_argument('--byproject',
                    help='Separate warnings in HTML output by project names',
                    action='store_true',
                    default=False)
parser.add_argument('--url',
                    help='Root URL of an Android source code tree prefixed '
                    'before files in warnings')
parser.add_argument('--separator',
                    help='Separator between the end of a URL and the line '
                    'number argument. e.g. #')
parser.add_argument('--processes',
                    type=int,
                    default=multiprocessing.cpu_count(),
                    help='Number of parallel processes to process warnings')
parser.add_argument(dest='buildlog', metavar='build.log',
                    help='Path to build.log file')
args = parser.parse_args()

warn_patterns = make_warn_patterns.warn_patterns
warn_patterns.extend(cpp_warn_patterns.warn_patterns)
warn_patterns.extend(java_warn_patterns.warn_patterns)
warn_patterns.extend(tidy_warn_patterns.warn_patterns)
warn_patterns.extend(other_warn_patterns.warn_patterns)

project_patterns = []
project_names = []
warning_messages = []
warning_records = []


def initialize_arrays():
  """Complete global arrays before they are used."""
  global project_names, project_patterns
  project_names = [p[0] for p in project_list]
  project_patterns = [re.compile(p[1]) for p in project_list]
  for w in warn_patterns:
    w['members'] = []
    # Each warning pattern has a 'projects' dictionary, that
    # maps a project name to number of warnings in that project.
    w['projects'] = {}


initialize_arrays()


android_root = ''
platform_version = 'unknown'
target_product = 'unknown'
target_variant = 'unknown'


##### Data and functions to dump html file. ##################################

html_head_scripts = """\
  <script type="text/javascript">
  function expand(id) {
    var e = document.getElementById(id);
    var f = document.getElementById(id + "_mark");
    if (e.style.display == 'block') {
       e.style.display = 'none';
       f.innerHTML = '&#x2295';
    }
    else {
       e.style.display = 'block';
       f.innerHTML = '&#x2296';
    }
  };
  function expandCollapse(show) {
    for (var id = 1; ; id++) {
      var e = document.getElementById(id + "");
      var f = document.getElementById(id + "_mark");
      if (!e || !f) break;
      e.style.display = (show ? 'block' : 'none');
      f.innerHTML = (show ? '&#x2296' : '&#x2295');
    }
  };
  </script>
  <style type="text/css">
  th,td{border-collapse:collapse; border:1px solid black;}
  .button{color:blue;font-size:110%;font-weight:bolder;}
  .bt{color:black;background-color:transparent;border:none;outline:none;
      font-size:140%;font-weight:bolder;}
  .c0{background-color:#e0e0e0;}
  .c1{background-color:#d0d0d0;}
  .t1{border-collapse:collapse; width:100%; border:1px solid black;}
  </style>
  <script src="https://www.gstatic.com/charts/loader.js"></script>
"""


def html_big(param):
  return '<font size="+2">' + param + '</font>'


def dump_html_prologue(title):
  print('<html>\n<head>')
  print('<title>' + title + '</title>')
  print(html_head_scripts)
  emit_stats_by_project()
  print('</head>\n<body>')
  print(html_big(title))
  print('<p>')


def dump_html_epilogue():
  print('</body>\n</head>\n</html>')


def sort_warnings():
  for i in warn_patterns:
    i['members'] = sorted(set(i['members']))


def emit_stats_by_project():
  """Dump a google chart table of warnings per project and severity."""
  # warnings[p][s] is number of warnings in project p of severity s.
  # pylint:disable=g-complex-comprehension
  warnings = {p: {s.value: 0 for s in Severity.levels} for p in project_names}
  for i in warn_patterns:
    # pytype: disable=attribute-error
    s = i['severity'].value
    # pytype: enable=attribute-error
    for p in i['projects']:
      warnings[p][s] += i['projects'][p]

  # total_by_project[p] is number of warnings in project p.
  total_by_project = {
      p: sum(warnings[p][s.value] for s in Severity.levels)
      for p in project_names
  }

  # total_by_severity[s] is number of warnings of severity s.
  total_by_severity = {
      s.value: sum(warnings[p][s.value] for p in project_names)
      for s in Severity.levels
  }

  # emit table header
  stats_header = ['Project']
  for s in Severity.levels:
    if total_by_severity[s.value]:
      stats_header.append(
          '<span style=\'background-color:{}\'>{}</span>'.format(
              s.color, s.column_header))
  stats_header.append('TOTAL')

  # emit a row of warning counts per project, skip no-warning projects
  total_all_projects = 0
  stats_rows = []
  for p in project_names:
    if total_by_project[p]:
      one_row = [p]
      for s in Severity.levels:
        if total_by_severity[s.value]:
          one_row.append(warnings[p][s.value])
      one_row.append(total_by_project[p])
      stats_rows.append(one_row)
      total_all_projects += total_by_project[p]

  # emit a row of warning counts per severity
  total_all_severities = 0
  one_row = ['<b>TOTAL</b>']
  for s in Severity.levels:
    if total_by_severity[s.value]:
      one_row.append(total_by_severity[s.value])
      total_all_severities += total_by_severity[s.value]
  one_row.append(total_all_projects)
  stats_rows.append(one_row)
  print('<script>')
  emit_const_string_array('StatsHeader', stats_header)
  emit_const_object_array('StatsRows', stats_rows)
  print(draw_table_javascript)
  print('</script>')


def dump_stats():
  """Dump some stats about total number of warnings and such."""
  known = 0
  skipped = 0
  unknown = 0
  sort_warnings()
  for i in warn_patterns:
    if i['severity'] == Severity.UNMATCHED:
      unknown += len(i['members'])
    elif i['severity'] == Severity.SKIP:
      skipped += len(i['members'])
    else:
      known += len(i['members'])
  print('Number of classified warnings: <b>' + str(known) + '</b><br>')
  print('Number of skipped warnings: <b>' + str(skipped) + '</b><br>')
  print('Number of unclassified warnings: <b>' + str(unknown) + '</b><br>')
  total = unknown + known + skipped
  extra_msg = ''
  if total < 1000:
    extra_msg = ' (low count may indicate incremental build)'
  print('Total number of warnings: <b>' + str(total) + '</b>' + extra_msg)


# New base table of warnings, [severity, warn_id, project, warning_message]
# Need buttons to show warnings in different grouping options.
# (1) Current, group by severity, id for each warning pattern
#     sort by severity, warn_id, warning_message
# (2) Current --byproject, group by severity,
#     id for each warning pattern + project name
#     sort by severity, warn_id, project, warning_message
# (3) New, group by project + severity,
#     id for each warning pattern
#     sort by project, severity, warn_id, warning_message
def emit_buttons():
  print('<button class="button" onclick="expandCollapse(1);">'
        'Expand all warnings</button>\n'
        '<button class="button" onclick="expandCollapse(0);">'
        'Collapse all warnings</button>\n'
        '<button class="button" onclick="groupBySeverity();">'
        'Group warnings by severity</button>\n'
        '<button class="button" onclick="groupByProject();">'
        'Group warnings by project</button><br>')


def all_patterns(category):
  patterns = ''
  for i in category['patterns']:
    patterns += i
    patterns += ' / '
  return patterns


def dump_fixed():
  """Show which warnings no longer occur."""
  anchor = 'fixed_warnings'
  mark = anchor + '_mark'
  print('\n<br><p style="background-color:lightblue"><b>'
        '<button id="' + mark + '" '
        'class="bt" onclick="expand(\'' + anchor + '\');">'
        '&#x2295</button> Fixed warnings. '
        'No more occurrences. Please consider turning these into '
        'errors if possible, before they are reintroduced in to the build'
        ':</b></p>')
  print('<blockquote>')
  fixed_patterns = []
  for i in warn_patterns:
    if not i['members']:
      fixed_patterns.append(i['description'] + ' (' +
                            all_patterns(i) + ')')
  fixed_patterns = sorted(fixed_patterns)
  print('<div id="' + anchor + '" style="display:none;"><table>')
  cur_row_class = 0
  for text in fixed_patterns:
    cur_row_class = 1 - cur_row_class
    # remove last '\n'
    t = text[:-1] if text[-1] == '\n' else text
    print('<tr><td class="c' + str(cur_row_class) + '">' + t + '</td></tr>')
  print('</table></div>')
  print('</blockquote>')


def find_project_index(line):
  for p in range(len(project_patterns)):
    if project_patterns[p].match(line):
      return p
  return -1


def classify_one_warning(line, results):
  """Classify one warning line."""
  for i in range(len(warn_patterns)):
    w = warn_patterns[i]
    for cpat in w['compiled_patterns']:
      # pytype: disable=attribute-error
      if cpat.match(line):
        p = find_project_index(line)
        results.append([line, i, p])
        return
      else:
        # If we end up here, there was a problem parsing the log
        # probably caused by 'make -j' mixing the output from
        # 2 or more concurrent compiles
        pass
      # pytype: enable=attribute-error


def classify_warnings(lines):
  results = []
  for line in lines:
    classify_one_warning(line, results)
  # After the main work, ignore all other signals to a child process,
  # to avoid bad warning/error messages from the exit clean-up process.
  if args.processes > 1:
    signal.signal(signal.SIGTERM, lambda *args: sys.exit(-signal.SIGTERM))
  return results


def parallel_classify_warnings(warning_lines, parallel_process):
  """Classify all warning lines with num_cpu parallel processes."""
  num_cpu = args.processes
  if num_cpu > 1:
    groups = [[] for x in range(num_cpu)]
    i = 0
    for x in warning_lines:
      groups[i].append(x)
      i = (i + 1) % num_cpu
    group_results = parallel_process(num_cpu, classify_warnings, groups)
  else:
    group_results = [classify_warnings(warning_lines)]

  for result in group_results:
    for line, pattern_idx, project_idx in result:
      pattern = warn_patterns[pattern_idx]
      pattern['members'].append(line)
      message_idx = len(warning_messages)
      warning_messages.append(line)
      warning_records.append([pattern_idx, project_idx, message_idx])
      pname = '???' if project_idx < 0 else project_names[project_idx]
      # Count warnings by project.
      if pname in pattern['projects']:
        pattern['projects'][pname] += 1
      else:
        pattern['projects'][pname] = 1


def find_warn_py_and_android_root(path):
  """Set and return android_root path if it is found."""
  global android_root
  parts = path.split('/')
  for idx in reversed(range(2, len(parts))):
    root_path = '/'.join(parts[:idx])
    # Android root directory should contain this script.
    if os.path.exists(root_path + '/build/make/tools/warn.py'):
      android_root = root_path
      return True
  return False


def find_android_root():
  """Guess android_root from common prefix of file paths."""
  # Use the longest common prefix of the absolute file paths
  # of the first 10000 warning messages as the android_root.
  global android_root
  warning_lines = set()
  warning_pattern = re.compile('^/[^ ]*/[^ ]*: warning: .*')
  count = 0
  infile = io.open(args.buildlog, mode='r', encoding='utf-8')
  for line in infile:
    if warning_pattern.match(line):
      warning_lines.add(line)
      count += 1
      if count > 9999:
        break
      # Try to find warn.py and use its location to find
      # the source tree root.
      if count < 100:
        path = os.path.normpath(re.sub(':.*$', '', line))
        if find_warn_py_and_android_root(path):
          return
  # Do not use common prefix of a small number of paths.
  if count > 10:
    # pytype: disable=wrong-arg-types
    root_path = os.path.commonprefix(warning_lines)
    # pytype: enable=wrong-arg-types
    if len(root_path) > 2 and root_path[len(root_path) - 1] == '/':
      android_root = root_path[:-1]


def remove_android_root_prefix(path):
  """Remove android_root prefix from path if it is found."""
  if path.startswith(android_root):
    return path[1 + len(android_root):]
  else:
    return path


def normalize_path(path):
  """Normalize file path relative to android_root."""
  # If path is not an absolute path, just normalize it.
  path = os.path.normpath(path)
  # Remove known prefix of root path and normalize the suffix.
  if path[0] == '/' and android_root:
    return remove_android_root_prefix(path)
  return path


def normalize_warning_line(line):
  """Normalize file path relative to android_root in a warning line."""
  # replace fancy quotes with plain ol' quotes
  line = re.sub(u'[\u2018\u2019]', '\'', line)
  # replace non-ASCII chars to spaces
  line = re.sub(u'[^\x00-\x7f]', ' ', line)
  line = line.strip()
  first_column = line.find(':')
  if first_column > 0:
    return normalize_path(line[:first_column]) + line[first_column:]
  else:
    return line


def parse_input_file(infile):
  """Parse input file, collect parameters and warning lines."""
  global android_root
  global platform_version
  global target_product
  global target_variant
  line_counter = 0

  # rustc warning messages have two lines that should be combined:
  #     warning: description
  #        --> file_path:line_number:column_number
  # Some warning messages have no file name:
  #     warning: macro replacement list ... [bugprone-macro-parentheses]
  # Some makefile warning messages have no line number:
  #     some/path/file.mk: warning: description
  # C/C++ compiler warning messages have line and column numbers:
  #     some/path/file.c:line_number:column_number: warning: description
  warning_pattern = re.compile('(^[^ ]*/[^ ]*: warning: .*)|(^warning: .*)')
  warning_without_file = re.compile('^warning: .*')
  rustc_file_position = re.compile('^[ ]+--> [^ ]*/[^ ]*:[0-9]+:[0-9]+')

  # Collect all warnings into the warning_lines set.
  warning_lines = set()
  prev_warning = ''
  for line in infile:
    if prev_warning:
      if rustc_file_position.match(line):
        # must be a rustc warning, combine 2 lines into one warning
        line = line.strip().replace('--> ', '') + ': ' + prev_warning
        warning_lines.add(normalize_warning_line(line))
        prev_warning = ''
        continue
      # add prev_warning, and then process the current line
      prev_warning = 'unknown_source_file: ' + prev_warning
      warning_lines.add(normalize_warning_line(prev_warning))
      prev_warning = ''
    if warning_pattern.match(line):
      if warning_without_file.match(line):
        # save this line and combine it with the next line
        prev_warning = line
      else:
        warning_lines.add(normalize_warning_line(line))
      continue
    if line_counter < 100:
      # save a little bit of time by only doing this for the first few lines
      line_counter += 1
      m = re.search('(?<=^PLATFORM_VERSION=).*', line)
      if m is not None:
        platform_version = m.group(0)
      m = re.search('(?<=^TARGET_PRODUCT=).*', line)
      if m is not None:
        target_product = m.group(0)
      m = re.search('(?<=^TARGET_BUILD_VARIANT=).*', line)
      if m is not None:
        target_variant = m.group(0)
      m = re.search('.* TOP=([^ ]*) .*', line)
      if m is not None:
        android_root = m.group(1)
  return warning_lines


# Return s with escaped backslash and quotation characters.
def escape_string(s):
  # pytype: disable=attribute-error
  return s.replace('\\', '\\\\').replace('"', '\\"')
  # pytype: enable=attribute-error


# Return s without trailing '\n' and escape the quotation characters.
def strip_escape_string(s):
  if not s:
    return s
  s = s[:-1] if s[-1] == '\n' else s
  return escape_string(s)


def emit_warning_array(name):
  print('var warning_{} = ['.format(name))
  for i in range(len(warn_patterns)):
    print('{},'.format(warn_patterns[i][name]))
  print('];')


def emit_warning_arrays():
  emit_warning_array('severity')
  print('var warning_description = [')
  for i in range(len(warn_patterns)):
    if warn_patterns[i]['members']:
      print('"{}",'.format(escape_string(warn_patterns[i]['description'])))
    else:
      print('"",')  # no such warning
  print('];')


scripts_for_warning_groups = """
  function compareMessages(x1, x2) { // of the same warning type
    return (WarningMessages[x1[2]] <= WarningMessages[x2[2]]) ? -1 : 1;
  }
  function byMessageCount(x1, x2) {
    return x2[2] - x1[2];  // reversed order
  }
  function bySeverityMessageCount(x1, x2) {
    // orer by severity first
    if (x1[1] != x2[1])
      return  x1[1] - x2[1];
    return byMessageCount(x1, x2);
  }
  const ParseLinePattern = /^([^ :]+):(\\d+):(.+)/;
  function addURL(line) {
    if (FlagURL == "") return line;
    if (FlagSeparator == "") {
      return line.replace(ParseLinePattern,
        "<a target='_blank' href='" + FlagURL + "/$1'>$1</a>:$2:$3");
    }
    return line.replace(ParseLinePattern,
      "<a target='_blank' href='" + FlagURL + "/$1" + FlagSeparator +
        "$2'>$1:$2</a>:$3");
  }
  function createArrayOfDictionaries(n) {
    var result = [];
    for (var i=0; i<n; i++) result.push({});
    return result;
  }
  function groupWarningsBySeverity() {
    // groups is an array of dictionaries,
    // each dictionary maps from warning type to array of warning messages.
    var groups = createArrayOfDictionaries(SeverityColors.length);
    for (var i=0; i<Warnings.length; i++) {
      var w = Warnings[i][0];
      var s = WarnPatternsSeverity[w];
      var k = w.toString();
      if (!(k in groups[s]))
        groups[s][k] = [];
      groups[s][k].push(Warnings[i]);
    }
    return groups;
  }
  function groupWarningsByProject() {
    var groups = createArrayOfDictionaries(ProjectNames.length);
    for (var i=0; i<Warnings.length; i++) {
      var w = Warnings[i][0];
      var p = Warnings[i][1];
      var k = w.toString();
      if (!(k in groups[p]))
        groups[p][k] = [];
      groups[p][k].push(Warnings[i]);
    }
    return groups;
  }
  var GlobalAnchor = 0;
  function createWarningSection(header, color, group) {
    var result = "";
    var groupKeys = [];
    var totalMessages = 0;
    for (var k in group) {
       totalMessages += group[k].length;
       groupKeys.push([k, WarnPatternsSeverity[parseInt(k)], group[k].length]);
    }
    groupKeys.sort(bySeverityMessageCount);
    for (var idx=0; idx<groupKeys.length; idx++) {
      var k = groupKeys[idx][0];
      var messages = group[k];
      var w = parseInt(k);
      var wcolor = SeverityColors[WarnPatternsSeverity[w]];
      var description = WarnPatternsDescription[w];
      if (description.length == 0)
          description = "???";
      GlobalAnchor += 1;
      result += "<table class='t1'><tr bgcolor='" + wcolor + "'><td>" +
                "<button class='bt' id='" + GlobalAnchor + "_mark" +
                "' onclick='expand(\\"" + GlobalAnchor + "\\");'>" +
                "&#x2295</button> " +
                description + " (" + messages.length + ")</td></tr></table>";
      result += "<div id='" + GlobalAnchor +
                "' style='display:none;'><table class='t1'>";
      var c = 0;
      messages.sort(compareMessages);
      for (var i=0; i<messages.length; i++) {
        result += "<tr><td class='c" + c + "'>" +
                  addURL(WarningMessages[messages[i][2]]) + "</td></tr>";
        c = 1 - c;
      }
      result += "</table></div>";
    }
    if (result.length > 0) {
      return "<br><span style='background-color:" + color + "'><b>" +
             header + ": " + totalMessages +
             "</b></span><blockquote><table class='t1'>" +
             result + "</table></blockquote>";

    }
    return "";  // empty section
  }
  function generateSectionsBySeverity() {
    var result = "";
    var groups = groupWarningsBySeverity();
    for (s=0; s<SeverityColors.length; s++) {
      result += createWarningSection(SeverityHeaders[s], SeverityColors[s], groups[s]);
    }
    return result;
  }
  function generateSectionsByProject() {
    var result = "";
    var groups = groupWarningsByProject();
    for (i=0; i<groups.length; i++) {
      result += createWarningSection(ProjectNames[i], 'lightgrey', groups[i]);
    }
    return result;
  }
  function groupWarnings(generator) {
    GlobalAnchor = 0;
    var e = document.getElementById("warning_groups");
    e.innerHTML = generator();
  }
  function groupBySeverity() {
    groupWarnings(generateSectionsBySeverity);
  }
  function groupByProject() {
    groupWarnings(generateSectionsByProject);
  }
"""


# Emit a JavaScript const string
def emit_const_string(name, value):
  print('const ' + name + ' = "' + escape_string(value) + '";')


# Emit a JavaScript const integer array.
def emit_const_int_array(name, array):
  print('const ' + name + ' = [')
  for n in array:
    print(str(n) + ',')
  print('];')


# Emit a JavaScript const string array.
def emit_const_string_array(name, array):
  print('const ' + name + ' = [')
  for s in array:
    print('"' + strip_escape_string(s) + '",')
  print('];')


# Emit a JavaScript const string array for HTML.
def emit_const_html_string_array(name, array):
  print('const ' + name + ' = [')
  for s in array:
    # Not using html.escape yet, to work for both python 2 and 3,
    # until all users switch to python 3.
    # pylint:disable=deprecated-method
    print('"' + cgi.escape(strip_escape_string(s)) + '",')
  print('];')


# Emit a JavaScript const object array.
def emit_const_object_array(name, array):
  print('const ' + name + ' = [')
  for x in array:
    print(str(x) + ',')
  print('];')


def emit_js_data():
  """Dump dynamic HTML page's static JavaScript data."""
  emit_const_string('FlagURL', args.url if args.url else '')
  emit_const_string('FlagSeparator', args.separator if args.separator else '')
  emit_const_string_array('SeverityColors', [s.color for s in Severity.levels])
  emit_const_string_array('SeverityHeaders',
                          [s.header for s in Severity.levels])
  emit_const_string_array('SeverityColumnHeaders',
                          [s.column_header for s in Severity.levels])
  emit_const_string_array('ProjectNames', project_names)
  # pytype: disable=attribute-error
  emit_const_int_array('WarnPatternsSeverity',
                       [w['severity'].value for w in warn_patterns])
  # pytype: enable=attribute-error
  emit_const_html_string_array('WarnPatternsDescription',
                               [w['description'] for w in warn_patterns])
  emit_const_html_string_array('WarningMessages', warning_messages)
  emit_const_object_array('Warnings', warning_records)

draw_table_javascript = """
google.charts.load('current', {'packages':['table']});
google.charts.setOnLoadCallback(drawTable);
function drawTable() {
  var data = new google.visualization.DataTable();
  data.addColumn('string', StatsHeader[0]);
  for (var i=1; i<StatsHeader.length; i++) {
    data.addColumn('number', StatsHeader[i]);
  }
  data.addRows(StatsRows);
  for (var i=0; i<StatsRows.length; i++) {
    for (var j=0; j<StatsHeader.length; j++) {
      data.setProperty(i, j, 'style', 'border:1px solid black;');
    }
  }
  var table = new google.visualization.Table(document.getElementById('stats_table'));
  table.draw(data, {allowHtml: true, alternatingRowStyle: true});
}
"""


def dump_html():
  """Dump the html output to stdout."""
  dump_html_prologue('Warnings for ' + platform_version + ' - ' +
                     target_product + ' - ' + target_variant)
  dump_stats()
  print('<br><div id="stats_table"></div><br>')
  print('\n<script>')
  emit_js_data()
  print(scripts_for_warning_groups)
  print('</script>')
  emit_buttons()
  # Warning messages are grouped by severities or project names.
  print('<br><div id="warning_groups"></div>')
  if args.byproject:
    print('<script>groupByProject();</script>')
  else:
    print('<script>groupBySeverity();</script>')
  dump_fixed()
  dump_html_epilogue()


##### Functions to count warnings and dump csv file. #########################


def description_for_csv(category):
  if not category['description']:
    return '?'
  return category['description']


def count_severity(writer, sev, kind):
  """Count warnings of given severity."""
  total = 0
  for i in warn_patterns:
    if i['severity'] == sev and i['members']:
      n = len(i['members'])
      total += n
      warning = kind + ': ' + description_for_csv(i)
      writer.writerow([n, '', warning])
      # print number of warnings for each project, ordered by project name.
      # pytype: disable=attribute-error
      projects = sorted(i['projects'].keys())
      # pytype: enable=attribute-error
      for p in projects:
        writer.writerow([i['projects'][p], p, warning])
  writer.writerow([total, '', kind + ' warnings'])

  return total


# dump number of warnings in csv format to stdout
def dump_csv(writer):
  """Dump number of warnings in csv format to stdout."""
  sort_warnings()
  total = 0
  for s in Severity.levels:
    if s != Severity.SEVERITY_UNKNOWN:
      total += count_severity(writer, s, s.column_header)
  writer.writerow([total, '', 'All warnings'])


def common_main(parallel_process):
  """Real main function to classify warnings and generate .html file."""
  find_android_root()
  # We must use 'utf-8' codec to parse some non-ASCII code in warnings.
  warning_lines = parse_input_file(
      io.open(args.buildlog, mode='r', encoding='utf-8'))
  parallel_classify_warnings(warning_lines, parallel_process)
  # If a user pases a csv path, save the fileoutput to the path
  # If the user also passed gencsv write the output to stdout
  # If the user did not pass gencsv flag dump the html report to stdout.
  if args.csvpath:
    with open(args.csvpath, 'w') as f:
      dump_csv(csv.writer(f, lineterminator='\n'))
  if args.gencsv:
    dump_csv(csv.writer(sys.stdout, lineterminator='\n'))
  else:
    dump_html()