You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
71 lines
2.3 KiB
71 lines
2.3 KiB
7 months ago
|
#
|
||
|
|
# Copyright 2021 Google, Inc.
|
||
|
|
#
|
||
|
|
# 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.
|
||
|
|
|
||
|
|
# Flex (fast lexical analyzer generator) is used for parsing languages. It is
|
||
|
|
# commonly used with a parser generator (like Bison).
|
||
|
|
|
||
|
|
# Generate source files using Flex.
|
||
|
|
#
|
||
|
|
# Note: We generate .cc files for Flex. However, you must set %option c++ if you
|
||
|
|
# want to generate a C++ scanner class. We don't use --c++ in case you have
|
||
|
|
# %option reentrant set, which is mutually exclusive with %option c++.
|
||
|
|
#
|
||
|
|
# Parameters:
|
||
|
|
# sources: Files used to generate the lexers.
|
||
|
|
template("flex_source") {
|
||
|
|
action_name = "${target_name}_gen"
|
||
|
|
action_foreach(action_name) {
|
||
|
|
forward_variables_from(invoker, [ "sources" ])
|
||
|
|
assert(defined(sources), "sources must be set")
|
||
|
|
foreach(s, sources) {
|
||
|
|
assert(get_path_info(s, "extension") == "ll",
|
||
|
|
"Expecting Flex extension ll: ${s}")
|
||
|
|
}
|
||
|
|
|
||
|
|
script = "//common-mk/file_generator_wrapper.py"
|
||
|
|
outformat = "${target_gen_dir}/{{source_name_part}}.cc"
|
||
|
|
args = [
|
||
|
|
"flex",
|
||
|
|
"-o",
|
||
|
|
outformat,
|
||
|
|
"{{source}}",
|
||
|
|
]
|
||
|
|
outputs = [ outformat ]
|
||
|
|
}
|
||
|
|
|
||
|
|
all_dependent_config_name = "_${target_name}_all_dependent_config"
|
||
|
|
config(all_dependent_config_name) {
|
||
|
|
include_dirs = [ "${target_gen_dir}" ]
|
||
|
|
}
|
||
|
|
|
||
|
|
source_set(target_name) {
|
||
|
|
sources = get_target_outputs(":${action_name}")
|
||
|
|
all_dependent_configs = [ ":${all_dependent_config_name}" ]
|
||
|
|
deps = [ ":${action_name}" ]
|
||
|
|
|
||
|
|
if (defined(invoker.configs)) {
|
||
|
|
configs += invoker.configs
|
||
|
|
}
|
||
|
|
|
||
|
|
# Silence some warnings. The autogenerated code includes parts that have
|
||
|
|
# fallthroughs and unreachable code. This may silence legitimate issues in
|
||
|
|
# user written code in the lexer as well. User beware!
|
||
|
|
cflags_cc = [
|
||
|
|
"-Wno-implicit-fallthrough",
|
||
|
|
"-Wno-unreachable-code",
|
||
|
|
]
|
||
|
|
}
|
||
|
|
}
|