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.bzl is the extension for Skylark, a subset of Python that is used to define build extensions for the Bazel build system. Eg: https://github.com/bazelbuild/bazel/blob/master/tools/build_rules/closure/closure_js_binary.bzl
125 lines
4.1 KiB
Python
125 lines
4.1 KiB
Python
# Copyright 2015 The Bazel Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Build definitions for JavaScript binaries compiled with the Closure Compiler.
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A single file is produced with the _compiled.js suffix.
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By default, the name of the entry point is assumed to be the same as that of the
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build target. This behaviour may be overridden with the "main" attribute.
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The optimization level may be set with the "compilation_level" attribute.
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Supported values are: unobfuscated, simple, and advanced.
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Example:
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closure_js_binary(
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name = "hello",
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compilation_level = "simple",
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language_in = "ecmascript6",
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language_out = "ecmascript3",
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externs = ["//third_party/javascript/google_cast/cast.js"],
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deps = [
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"@closure_library//:closure_library",
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":hello_lib",
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],
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)
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This rule will produce hello_combined.js.
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"""
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_COMPILATION_LEVELS = {
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"whitespace_only": [
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"--compilation_level=WHITESPACE_ONLY",
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"--formatting=PRETTY_PRINT"
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],
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"simple": ["--compilation_level=SIMPLE"],
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"advanced": ["--compilation_level=ADVANCED"]
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}
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_SUPPORTED_LANGUAGES = {
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"es3": ["ES3"],
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"ecmascript3": ["ECMASCRIPT3"],
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"es5": ["ES5"],
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"ecmascript5": ["ECMASCRIPT5"],
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"es5_strict": ["ES5_STRICT"],
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"ecmascript5_strict": ["ECMASCRIPT5_STRICT"],
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"es6": ["ES6"],
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"ecmascript6": ["ECMASCRIPT6"],
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"es6_strict": ["ES6_STRICT"],
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"ecmascript6_strict": ["ECMASCRIPT6_STRICT"],
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"es6_typed": ["ES6_TYPED"],
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"ecmascript6_typed": ["ECMASCRIPT6_TYPED"],
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}
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def _impl(ctx):
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externs = set(order="compile")
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srcs = set(order="compile")
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for dep in ctx.attr.deps:
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externs += dep.transitive_js_externs
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srcs += dep.transitive_js_srcs
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args = [
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"--entry_point=goog:%s" % ctx.attr.main,
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"--js_output_file=%s" % ctx.outputs.out.path,
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"--dependency_mode=LOOSE",
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"--warning_level=VERBOSE",
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] + (["--js=%s" % src.path for src in srcs] +
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["--externs=%s" % extern.path for extern in externs])
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# Set the compilation level.
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if ctx.attr.compilation_level in _COMPILATION_LEVELS:
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args += _COMPILATION_LEVELS[ctx.attr.compilation_level]
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else:
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fail("Invalid compilation_level '%s', expected one of %s" %
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(ctx.attr.compilation_level, _COMPILATION_LEVELS.keys()))
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# Set the language in.
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if ctx.attr.language_in in _SUPPORTED_LANGUAGES:
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args += "--language_in=" + _SUPPORTED_LANGUAGES[ctx.attr.language_in]
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else:
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fail("Invalid language_in '%s', expected one of %s" %
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(ctx.attr.language_in, _SUPPORTED_LANGUAGES.keys()))
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# Set the language out.
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if ctx.attr.language_out in _SUPPORTED_LANGUAGES:
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args += "--language_out=" + _SUPPORTED_LANGUAGES[ctx.attr.language_out]
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else:
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fail("Invalid language_out '%s', expected one of %s" %
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(ctx.attr.language_out, _SUPPORTED_LANGUAGES.keys()))
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ctx.action(
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inputs=list(srcs) + list(externs),
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outputs=[ctx.outputs.out],
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arguments=args,
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executable=ctx.executable._closure_compiler)
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return struct(files=set([ctx.outputs.out]))
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closure_js_binary = rule(
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implementation=_impl,
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attrs={
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"deps": attr.label_list(
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allow_files=False,
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providers=["transitive_js_externs", "transitive_js_srcs"]),
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"main": attr.string(default="%{name}"),
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"compilation_level": attr.string(default="advanced"),
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"language_in": attr.string(default="ecmascript6"),
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"language_out": attr.string(default="ecmascript3"),
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"_closure_compiler": attr.label(
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default=Label("//external:closure_compiler_"),
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executable=True),
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},
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outputs={"out": "%{name}_combined.js"})
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