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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.
"""Build definitions for Closure stylesheets. Two files are produced: a minified
and obfuscated CSS file and a JS file defining a map between CSS classes and the
obfuscated class name. The stylesheet targets may be used in closure_js_binary
rules.
Both CSS and GSS files may be used with this rule.
Example:
closure_stylesheet_library(
name = "hello_css",
srcs = ["hello.gss"].
)
This rule will produce hello_css_combined.css and hello_css_renaming.js.
"""
_GSS_FILE_TYPE = FileType([".css", ".gss"])
def _impl(ctx):
srcs = set(order="compile")
for dep in ctx.attr.deps:
srcs += dep.transitive_gss_srcs
srcs += _GSS_FILE_TYPE.filter(ctx.files.srcs)
args = [
"--output-file",
ctx.outputs.out.path,
"--output-renaming-map",
ctx.outputs.out_renaming.path,
"--output-renaming-map-format",
"CLOSURE_COMPILED",
"--rename",
"CLOSURE"
] + [src.path for src in srcs]
ctx.action(
inputs=list(srcs),
outputs=[ctx.outputs.out, ctx.outputs.out_renaming],
arguments=args,
executable=ctx.executable._closure_stylesheets)
return struct(
files=set([ctx.outputs.out]),
transitive_gss_srcs=srcs,
transitive_js_externs=set(),
transitive_js_srcs=[ctx.outputs.out_renaming])
# There are two outputs:
# - %{name}_combined.css: A minified and obfuscated CSS file.
# - %{name}_renaming.js: A map from the original CSS class name to the
# obfuscated name. This file is used by
# closure_js_binary rules.
closure_stylesheet_library = rule(
implementation=_impl,
attrs={
"srcs": attr.label_list(allow_files=_GSS_FILE_TYPE),
"deps": attr.label_list(
providers=["transitive_gss_srcs", "transitive_js_srcs"]),
"_closure_stylesheets": attr.label(
default=Label("//tools/build_rules/closure:closure_stylesheets"),
executable=True),
},
outputs={
"out": "%{name}_combined.css",
"out_renaming": "%{name}_renaming.js"
})
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