1 files changed, 200 insertions, 0 deletions
diff --git a/src/arrow/js/gulp/util.js b/src/arrow/js/gulp/util.js
new file mode 100644
index 000000000..d8cde29e8
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+++ b/src/arrow/js/gulp/util.js
@@ -0,0 +1,200 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you 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.
+
+const fs = require('fs');
+const path = require(`path`);
+const pump = require(`stream`).pipeline;
+const child_process = require(`child_process`);
+const { targets, modules } = require('./argv');
+const {
+    ReplaySubject,
+    empty: ObservableEmpty,
+    throwError: ObservableThrow,
+    fromEvent: ObservableFromEvent
+} = require('rxjs');
+const {
+    share,
+    flatMap,
+    takeUntil,
+    defaultIfEmpty,
+    mergeWith,
+} = require('rxjs/operators');
+const asyncDone = require('util').promisify(require('async-done'));
+
+const mainExport = `Arrow`;
+const npmPkgName = `apache-arrow`;
+const npmOrgName = `@${npmPkgName}`;
+
+const releasesRootDir = `targets`;
+const knownTargets = [`es5`, `es2015`, `esnext`];
+const knownModules = [`cjs`, `esm`, `cls`, `umd`];
+const tasksToSkipPerTargetOrFormat = {
+    src: { clean: true, build: true },
+    cls: { test: true, package: true }
+};
+const packageJSONFields = [
+  `version`, `license`, `description`,
+  `author`, `homepage`, `repository`,
+  `bugs`, `keywords`,  `dependencies`,
+  `bin`
+];
+
+const metadataFiles = [`LICENSE.txt`, `NOTICE.txt`, `README.md`].map((filename) => {
+    let prefixes = [`./`, `../`];
+    let p = prefixes.find((prefix) => {
+        try {
+            fs.statSync(path.resolve(path.join(prefix, filename)));
+        } catch (e) { return false; }
+        return true;
+    });
+    if (!p) {
+        throw new Error(`Couldn't find ${filename} in ./ or ../`);
+    }
+    return path.join(p, filename);
+});
+
+// see: https://github.com/google/closure-compiler/blob/c1372b799d94582eaf4b507a4a22558ff26c403c/src/com/google/javascript/jscomp/CompilerOptions.java#L2988
+const gCCLanguageNames = {
+    es5: `ECMASCRIPT5`,
+ es2015: `ECMASCRIPT_2015`,
+ es2016: `ECMASCRIPT_2016`,
+ es2017: `ECMASCRIPT_2017`,
+ es2018: `ECMASCRIPT_2018`,
+ es2019: `ECMASCRIPT_2019`,
+ esnext: `ECMASCRIPT_NEXT`
+};
+
+function taskName(target, format) {
+    return !format ? target : `${target}:${format}`;
+}
+
+function packageName(target, format) {
+    return !format ? target : `${target}-${format}`;
+}
+
+function tsconfigName(target, format) {
+    return !format ? target : `${target}.${format}`;
+}
+
+function targetDir(target, format) {
+    return path.join(releasesRootDir, ...(!format ? [target] : [target, format]));
+}
+
+function shouldRunInChildProcess(target, format) {
+    // If we're building more than one module/target, then yes run this task in a child process
+    if (targets.length > 1 || modules.length > 1) { return true; }
+    // If the target we're building *isn't* the target the gulp command was configured to run, then yes run that in a child process
+    if (targets[0] !== target || modules[0] !== format) { return true; }
+    // Otherwise no need -- either gulp was run for just one target, or we've been spawned as the child of a multi-target parent gulp
+    return false;
+}
+
+const gulp = path.join(path.parse(require.resolve(`gulp`)).dir, `bin/gulp.js`);
+function spawnGulpCommandInChildProcess(command, target, format) {
+    const args = [gulp, command, '-t', target, '-m', format, `--silent`];
+    const opts = {
+        stdio: [`ignore`, `inherit`, `inherit`],
+        env: { ...process.env, NODE_NO_WARNINGS: `1` }
+    };
+    return asyncDone(() => child_process.spawn(`node`, args, opts))
+        .catch((e) => { throw `Error in "${command}:${taskName(target, format)}" task`; });
+}
+
+const logAndDie = (e) => { if (e) { process.exit(1) } };
+function observableFromStreams(...streams) {
+    if (streams.length <= 0) { return ObservableEmpty(); }
+    const pumped = streams.length <= 1 ? streams[0] : pump(...streams, logAndDie);
+    const fromEvent = ObservableFromEvent.bind(null, pumped);
+    const streamObs = fromEvent(`data`).pipe(
+        mergeWith(fromEvent(`error`).pipe(flatMap((e) => ObservableThrow(e)))),
+        takeUntil(fromEvent(`end`).pipe(mergeWith(fromEvent(`close`)))),
+        defaultIfEmpty(`empty stream`),
+        share({ connector: () => new ReplaySubject(), resetOnError: false, resetOnComplete: false, resetOnRefCountZero: false })
+    );
+    streamObs.stream = pumped;
+    streamObs.observable = streamObs;
+    return streamObs;
+}
+
+function* combinations(_targets, _modules) {
+    const targets = known(knownTargets, _targets || [`all`]);
+    const modules = known(knownModules, _modules || [`all`]);
+
+    if (_targets.includes(`src`)) {
+        yield [`src`, ``];
+        return;
+    }
+
+    if (_targets.includes(`all`) && _modules.includes(`all`)) {
+        yield [`ts`, ``];
+        yield [`src`, ``];
+        yield [npmPkgName, ``];
+    }
+
+    for (const format of modules) {
+        for (const target of targets) {
+            yield [target, format];
+        }
+    }
+
+    function known(known, values) {
+        return values.includes(`all`) ? known
+            :  values.includes(`src`) ? [`src`]
+            : Object.keys(
+                values.reduce((map, arg) => ((
+                    (known.includes(arg)) &&
+                    (map[arg.toLowerCase()] = true)
+                    || true) && map
+                ), {})
+            ).sort((a, b) => known.indexOf(a) - known.indexOf(b));
+    }
+}
+
+const publicModulePaths = (dir) => [
+    `${dir}/${mainExport}.dom.js`,
+    `${dir}/util/int.js`,
+    `${dir}/compute/predicate.js`,
+];
+
+const esmRequire = require(`esm`)(module, {
+    mode: `auto`,
+    cjs: {
+        /* A boolean for storing ES modules in require.cache. */
+        cache: true,
+        /* A boolean for respecting require.extensions in ESM. */
+        extensions: true,
+        /* A boolean for __esModule interoperability. */
+        interop: true,
+        /* A boolean for importing named exports of CJS modules. */
+        namedExports: true,
+        /* A boolean for following CJS path rules in ESM. */
+        paths: true,
+        /* A boolean for __dirname, __filename, and require in ESM. */
+        vars: true,
+    }
+});
+
+module.exports = {
+    mainExport, npmPkgName, npmOrgName, metadataFiles, packageJSONFields,
+
+    knownTargets, knownModules, tasksToSkipPerTargetOrFormat, gCCLanguageNames,
+
+    taskName, packageName, tsconfigName, targetDir, combinations, observableFromStreams,
+    publicModulePaths, esmRequire, shouldRunInChildProcess, spawnGulpCommandInChildProcess,
+
+    targetAndModuleCombinations: [...combinations(targets, modules)]
+};