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# Copyright 2015 Google Inc. All rights reserved.
#
# 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.
"""Jsonnet rules for Bazel."""
JSONNET_FILETYPE = FileType([".jsonnet"])
def _setup_deps(deps):
"""Collects source files and import flags of transitive dependencies.
Args:
deps: List of deps labels from ctx.attr.deps.
Returns:
Returns a struct containing the following fields:
transitive_sources: List of Files containing sources of transitive
dependencies
imports: List of Strings containing import flags set by transitive
dependency targets.
"""
transitive_sources = set(order="compile")
imports = set()
for dep in deps:
transitive_sources += dep.transitive_jsonnet_files
imports += ["%s/%s" % (dep.label.package, im) for im in dep.imports]
return struct(
transitive_sources = transitive_sources,
imports = imports)
def _jsonnet_library_impl(ctx):
"""Implementation of the jsonnet_library rule."""
depinfo = _setup_deps(ctx.attr.deps)
sources = depinfo.transitive_sources + ctx.files.srcs
imports = depinfo.imports + ctx.attr.imports
return struct(files = set(),
transitive_jsonnet_files = sources,
imports = imports)
def _jsonnet_toolchain(ctx):
return struct(
jsonnet_path = ctx.file._jsonnet.path,
imports = ["-J %s" % ctx.file._std.dirname])
def _jsonnet_to_json_impl(ctx):
"""Implementation of the jsonnet_to_json rule."""
depinfo = _setup_deps(ctx.attr.deps)
toolchain = _jsonnet_toolchain(ctx)
command = (
[
"set -e;",
toolchain.jsonnet_path,
] +
["-J %s/%s" % (ctx.label.package, im) for im in ctx.attr.imports] +
["-J %s" % im for im in depinfo.imports] +
toolchain.imports +
["-J ."])
outputs = []
# If multiple_outputs is set to true, then jsonnet will be invoked with the
# -m flag for multiple outputs. Otherwise, jsonnet will write the resulting
# JSON to stdout, which is redirected into a single JSON output file.
if len(ctx.attr.outs) > 1 or ctx.attr.multiple_outputs:
output_json_files = [ctx.new_file(ctx.configuration.bin_dir, out.name)
for out in ctx.attr.outs]
outputs += output_json_files
command += ["-m", ctx.file.src.path]
# Currently, jsonnet -m creates the output files in the current working
# directory. Append mv commands to move the output files into their
# correct output directories.
# TODO(dzc): Remove this hack when jsonnet supports a flag for setting
# an output directory.
for json_file in output_json_files:
command += ["; mv %s %s" % (json_file.basename, json_file.path)]
else:
if len(ctx.attr.outs) > 1:
fail("Only one file can be specified in outs if multiple_outputs is " +
"not set.")
compiled_json = ctx.new_file(ctx.configuration.bin_dir,
ctx.attr.outs[0].name)
outputs += [compiled_json]
command += [ctx.file.src.path, "> %s" % compiled_json.path]
compile_inputs = (
[ctx.file.src, ctx.file._jsonnet, ctx.file._std] +
list(depinfo.transitive_sources))
ctx.action(
inputs = compile_inputs,
outputs = outputs,
mnemonic = "Jsonnet",
command = " ".join(command),
use_default_shell_env = True,
progress_message = "Compiling Jsonnet to JSON for " + ctx.label.name);
_jsonnet_common_attrs = {
"deps": attr.label_list(providers = ["transitive_jsonnet_files"],
allow_files = False),
"imports": attr.string_list(),
"_jsonnet": attr.label(
default = Label("//tools/build_defs/jsonnet:jsonnet"),
executable = True,
single_file = True),
"_std": attr.label(default = Label("//tools/build_defs/jsonnet:std"),
single_file = True),
}
_jsonnet_library_attrs = {
"srcs": attr.label_list(allow_files = JSONNET_FILETYPE),
}
jsonnet_library = rule(
_jsonnet_library_impl,
attrs = _jsonnet_library_attrs + _jsonnet_common_attrs,
)
_jsonnet_to_json_attrs = {
"src": attr.label(allow_files = JSONNET_FILETYPE,
single_file = True),
"outs": attr.output_list(mandatory = True),
"multiple_outputs": attr.bool(),
}
jsonnet_to_json = rule(
_jsonnet_to_json_impl,
attrs = _jsonnet_to_json_attrs + _jsonnet_common_attrs,
)
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