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#!/usr/bin/env python
#
# Copyright 2006-2008 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 is a utility for converting JavaScript source code into uint16_t[],
that are used for embedding JavaScript code into the Node.js binary.
"""
import argparse
import os
import re
import functools
import codecs
def ReadFile(filename):
if is_verbose:
print(filename)
with codecs.open(filename, "r", "utf-8") as f:
lines = f.read()
return lines
TEMPLATE = """
#include "env-inl.h"
#include "node_native_module.h"
#include "node_internals.h"
namespace node {{
namespace native_module {{
{0}
void NativeModuleLoader::LoadJavaScriptSource() {{
{1}
}}
UnionBytes NativeModuleLoader::GetConfig() {{
return UnionBytes(config_raw, {2}); // config.gypi
}}
}} // namespace native_module
}} // namespace node
"""
ONE_BYTE_STRING = """
static const uint8_t {0}[] = {{
{1}
}};
"""
TWO_BYTE_STRING = """
static const uint16_t {0}[] = {{
{1}
}};
"""
INITIALIZER = 'source_.emplace("{0}", UnionBytes{{{1}, {2}}});'
CONFIG_GYPI_ID = 'config_raw'
SLUGGER_RE =re.compile('[.\-/]')
is_verbose = False
def GetDefinition(var, source, step=30):
template = ONE_BYTE_STRING
code_points = [ord(c) for c in source]
if any(c > 127 for c in code_points):
template = TWO_BYTE_STRING
# Treat non-ASCII as UTF-8 and encode as UTF-16 Little Endian.
encoded_source = bytearray(source, 'utf-16le')
code_points = [
encoded_source[i] + (encoded_source[i + 1] * 256)
for i in range(0, len(encoded_source), 2)
]
# For easier debugging, align to the common 3 char for code-points.
elements_s = ['%3s' % x for x in code_points]
# Put no more then `step` code-points in a line.
slices = [elements_s[i:i + step] for i in range(0, len(elements_s), step)]
lines = [','.join(s) for s in slices]
array_content = ',\n'.join(lines)
definition = template.format(var, array_content)
return definition, len(code_points)
def AddModule(filename, definitions, initializers):
code = ReadFile(filename)
name = NormalizeFileName(filename)
slug = SLUGGER_RE.sub('_', name)
var = slug + '_raw'
definition, size = GetDefinition(var, code)
initializer = INITIALIZER.format(name, var, size)
definitions.append(definition)
initializers.append(initializer)
def NormalizeFileName(filename):
split = filename.split(os.path.sep)
if split[0] == 'deps':
split = ['internal'] + split
else: # `lib/**/*.js` so drop the 'lib' part
split = split[1:]
if len(split):
filename = '/'.join(split)
return os.path.splitext(filename)[0]
def JS2C(source_files, target):
# Build source code lines
definitions = []
initializers = []
for filename in source_files['.js']:
AddModule(filename, definitions, initializers)
config_def, config_size = handle_config_gypi(source_files['config.gypi'])
definitions.append(config_def)
# Emit result
definitions = ''.join(definitions)
initializers = '\n '.join(initializers)
out = TEMPLATE.format(definitions, initializers, config_size)
write_if_chaged(out, target)
def handle_config_gypi(config_filename):
# if its a gypi file we're going to want it as json
# later on anyway, so get it out of the way now
config = ReadFile(config_filename)
config = jsonify(config)
config_def, config_size = GetDefinition(CONFIG_GYPI_ID, config)
return config_def, config_size
def jsonify(config):
# 1. string comments
config = re.sub(r'#.*?\n', '', config)
# 3. normalize string literals from ' into "
config = re.sub('\'', '"', config)
# 2. turn pseudo-booleans strings into Booleans
config = re.sub('"true"', 'true', config)
config = re.sub('"false"', 'false', config)
return config
def write_if_chaged(content, target):
if os.path.exists(target):
with open(target, 'rt') as existing:
old_content = existing.read()
else:
old_content = ''
if old_content == content:
return
with open(target, "wt") as output:
output.write(content)
def SourceFileByExt(files_by_ext, filename):
"""
:type files_by_ext: dict
:type filename: str
:rtype: dict
"""
ext = os.path.splitext(filename)[-1]
files_by_ext.setdefault(ext, []).append(filename)
return files_by_ext
def main():
parser = argparse.ArgumentParser(
description='Convert code files into `uint16_t[]`s',
fromfile_prefix_chars='@'
)
parser.add_argument('--target', help='output file')
parser.add_argument('--verbose', action='store_true', help='output file')
parser.add_argument('sources', nargs='*', help='input files')
options = parser.parse_args()
global is_verbose
is_verbose = options.verbose
source_files = functools.reduce(SourceFileByExt, options.sources, {})
# Should have exactly 2 types: `.js`, and `.gypi`
assert len(source_files) == 2
# Currently config.gypi is the only `.gypi` file allowed
assert source_files['.gypi'] == ['config.gypi']
source_files['config.gypi'] = source_files.pop('.gypi')[0]
JS2C(source_files, options.target)
if __name__ == "__main__":
main()
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