build_defs/cc_fuzztest_grammar_library.bzl

# Copyright 2022 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
#
#      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,
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"""Build rules to create cc_library that implements the InGrammar domain for a
given grammar from an ANTLRv4 grammar specification."""

def cc_fuzztest_grammar_library(name, srcs):
    """Generates the C++ library corresponding to an antlr4 grammar specification.

    Args:
      name: The name of the package to use for the cc_library. E.g., `json_grammar`.
      srcs: The grammar specification files in ANTRLv4 format. E.g., `json.g4`.
    """

    output_file_name = name + ".h"

    native.genrule(
        name = name + "_source",
        srcs = srcs,
        outs = [output_file_name],
        cmd = "$(location //tools:grammar_domain_code_generator) " +
              "--output_header_file_path " +
              "$(@D)/" + output_file_name + " --input_grammar_files " + "$(SRCS)",
        heuristic_label_expansion = False,
        tools = ["//tools:grammar_domain_code_generator"],
    )

    native.cc_library(
        name = name,
        hdrs = [output_file_name],
        deps = ["//fuzztest:domain"],
    )