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# Copyright 2015 The Bazel Authors. 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.
SASS_FILETYPES = FileType([".sass", ".scss"])
def collect_transitive_sources(ctx):
source_files = set(order="compile")
for dep in ctx.attr.deps:
source_files += dep.transitive_sass_files
return source_files
def _sass_library_impl(ctx):
transitive_sources = collect_transitive_sources(ctx)
transitive_sources += SASS_FILETYPES.filter(ctx.files.srcs)
return struct(
files = set(),
transitive_sass_files = transitive_sources)
def _sass_binary_impl(ctx):
# Reference the sass compiler and define the default options
# that sass_binary uses.
sassc = ctx.file._sassc
options = [
"--style={0}".format(ctx.attr.output_style),
"--sourcemap",
]
# Load up all the transitive sources as dependent includes.
transitive_sources = collect_transitive_sources(ctx)
for src in transitive_sources:
options += ["-I={0}".format(src)]
ctx.action(
inputs = [sassc, ctx.file.src] + list(transitive_sources),
executable = sassc,
arguments = options + [ctx.file.src.path, ctx.outputs.css_file.path],
mnemonic = "SassCompiler",
outputs = [ctx.outputs.css_file, ctx.outputs.css_map_file],
)
sass_deps_attr = attr.label_list(
providers = ["transitive_sass_files"],
allow_files = False,
)
sass_library = rule(
implementation = _sass_library_impl,
attrs = {
"srcs": attr.label_list(
allow_files = SASS_FILETYPES,
non_empty = True,
mandatory = True,
),
"deps": sass_deps_attr,
},
)
sass_binary = rule(
implementation = _sass_binary_impl,
attrs = {
"src": attr.label(
allow_files = SASS_FILETYPES,
mandatory = True,
single_file = True,
),
"output_style": attr.string(default = "compressed"),
"deps": sass_deps_attr,
"_sassc": attr.label(
default = Label("//tools/build_defs/sass:sassc"),
executable = True,
single_file = True,
),
},
outputs = {
"css_file": "%{name}.css",
"css_map_file": "%{name}.css.map",
},
)
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