# 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/.
#
# ToCAsciiArray and ToCArray are from V8's js2c.py.
#
# Copyright 2012 the V8 project authors. All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above
#       copyright notice, this list of conditions and the following
#       disclaimer in the documentation and/or other materials provided
#       with the distribution.
#     * Neither the name of Google Inc. nor the names of its
#       contributors may be used to endorse or promote products derived
#       from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# This utility converts JS files containing self-hosted builtins into a C
# header file that can be embedded into SpiderMonkey.
#
# It uses the C preprocessor to process its inputs.

from __future__ import with_statement
import re, sys, os, subprocess
import shlex
import which
import buildconfig

def ToCAsciiArray(lines):
  result = []
  for chr in lines:
    value = ord(chr)
    assert value < 128
    result.append(str(value))
  return ", ".join(result)

def ToCArray(lines):
  result = []
  for chr in lines:
    result.append(str(ord(chr)))
  return ", ".join(result)

HEADER_TEMPLATE = """\
/* 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/. */

namespace js {
namespace %(namespace)s {
    static const %(sources_type)s data[] = { %(sources_data)s };

    static const %(sources_type)s * const %(sources_name)s = reinterpret_cast<const %(sources_type)s *>(data);

    uint32_t GetCompressedSize() {
        return %(compressed_total_length)i;
    }

    uint32_t GetRawScriptsSize() {
        return %(raw_total_length)i;
    }
} // selfhosted
} // js
"""

def embed(cxx, preprocessorOption, msgs, sources, c_out, js_out, namespace, env):
  combinedSources = '\n'.join([msgs] + ['#include "%(s)s"' % { 's': source } for source in sources])
  args = ['-D%(k)s=%(v)s' % { 'k': k, 'v': env[k] } for k in env]
  preprocessed = preprocess(cxx, preprocessorOption, combinedSources, args)
  processed = '\n'.join([line for line in preprocessed.splitlines() if \
                         (line.strip() and not line.startswith('#'))])

  js_out.write(processed)
  import zlib
  compressed = zlib.compress(processed)
  data = ToCArray(compressed)
  c_out.write(HEADER_TEMPLATE % {
    'sources_type': 'unsigned char',
    'sources_data': data,
    'sources_name': 'compressedSources',
    'compressed_total_length': len(compressed),
    'raw_total_length': len(processed),
    'namespace': namespace
  })

def preprocess(cxx, preprocessorOption, source, args = []):
  if (not os.path.exists(cxx[0])):
    cxx[0] = which.which(cxx[0])
  # Clang seems to complain and not output anything if the extension of the
  # input is not something it recognizes, so just fake a .cpp here.
  tmpIn = 'self-hosting-cpp-input.cpp';
  tmpOut = 'self-hosting-preprocessed.pp';
  outputArg = shlex.split(preprocessorOption + tmpOut)

  with open(tmpIn, 'wb') as input:
    input.write(source)
  print(' '.join(cxx + outputArg + args + [tmpIn]))
  result = subprocess.Popen(cxx + outputArg + args + [tmpIn]).wait()
  if (result != 0):
    sys.exit(result);
  with open(tmpOut, 'r') as output:
    processed = output.read();
  os.remove(tmpIn)
  os.remove(tmpOut)
  return processed

def messages(jsmsg):
  defines = []
  for line in open(jsmsg):
    match = re.match("MSG_DEF\((JSMSG_(\w+))", line)
    if match:
      defines.append("#define %s %i" % (match.group(1), len(defines)))
    else:
      # Make sure that MSG_DEF isn't preceded by whitespace
      assert not line.strip().startswith("MSG_DEF")
  return '\n'.join(defines)

def get_config_defines(buildconfig):
  # Collect defines equivalent to ACDEFINES and add MOZ_DEBUG_DEFINES.
  env = {key: value for key, value in buildconfig.defines.iteritems()
         if key not in buildconfig.non_global_defines}
  for value in buildconfig.substs['MOZ_DEBUG_DEFINES'].split():
    assert value[:2] == "-D"
    pair = value[2:].split('=', 1)
    if len(pair) == 1:
      pair.append(1)
    env[pair[0]] = pair[1]
  return env

def process_inputs(namespace, c_out, msg_file, inputs):
  deps = [path for path in inputs if path.endswith(".h")]
  sources = [path for path in inputs if path.endswith(".js")]
  assert len(deps) + len(sources) == len(inputs)
  cxx = shlex.split(buildconfig.substs['CXX'])
  cxx_option = buildconfig.substs['PREPROCESS_OPTION']
  env = get_config_defines(buildconfig)
  js_path = re.sub(r"\.out\.h$", "", c_out.name) + ".js"
  msgs = messages(msg_file)
  with open(js_path, 'w') as js_out:
    embed(cxx, cxx_option, msgs, sources, c_out, js_out, namespace, env)

def generate_selfhosted(c_out, msg_file, *inputs):
  # Called from moz.build to embed selfhosted JS.
  process_inputs('selfhosted', c_out, msg_file, inputs)

def generate_shellmoduleloader(c_out, msg_file, *inputs):
  # Called from moz.build to embed shell module loader JS.
  process_inputs('moduleloader', c_out, msg_file, inputs)