blob: 77bcb84ad273e26ade52880565840d6b291cfc2a [file] [log] [blame]
# Copyright 2019 Google LLC
#
# 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
#
# https://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.
"""Emboss C++ code generator.
This is a driver program that reads IR, feeds it to header_generator, and prints
the result.
"""
from __future__ import print_function
import argparse
import os
import sys
from compiler.back_end.cpp import header_generator
from compiler.util import error
from compiler.util import ir_pb2
def _parse_command_line(argv):
"""Parses the given command-line arguments."""
parser = argparse.ArgumentParser(description="Emboss compiler C++ back end.",
prog=argv[0])
parser.add_argument("--input-file",
type=str,
help=".emb.ir file to compile.")
parser.add_argument("--output-file",
type=str,
help="Write header to file. If not specified, write " +
"header to stdout.")
parser.add_argument("--color-output",
default="if_tty",
choices=["always", "never", "if_tty", "auto"],
help="Print error messages using color. 'auto' is a "
"synonym for 'if_tty'.")
return parser.parse_args(argv[1:])
def _show_errors(errors, ir, flags):
"""Prints errors with source code snippets."""
source_codes = {}
for module in ir.module:
source_codes[module.source_file_name] = module.source_text
use_color = (flags.color_output == "always" or
(flags.color_output in ("auto", "if_tty") and
os.isatty(sys.stderr.fileno())))
print(error.format_errors(errors, source_codes, use_color), file=sys.stderr)
def main(flags):
if flags.input_file:
with open(flags.input_file) as f:
ir = ir_pb2.EmbossIr.from_json(f.read())
else:
ir = ir_pb2.EmbossIr.from_json(sys.stdin.read())
header, errors = header_generator.generate_header(ir)
if errors:
_show_errors(errors, ir, flags)
return 1
if flags.output_file:
with open(flags.output_file, "w") as f:
f.write(header)
else:
print(header)
return 0
if __name__ == '__main__':
sys.exit(main(_parse_command_line(sys.argv)))