Add initial scala support (#2737)

* Add initial scala support

* Fix scala 3 compiler flags

* Use semver instead

1 files changed, 76 insertions, 0 deletions

diff --git a/lib/compilers/scala.js b/lib/compilers/scala.js
new file mode 100644
index 000000000..a0cec3a33
--- /dev/null
+++ b/lib/compilers/scala.js
@@ -0,0 +1,76 @@
+// Copyright (c) 2021, Compiler Explorer Authors
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+//     * Redistributions of source code must retain the above copyright notice,
+//       this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above copyright
+//       notice, this list of conditions and the following disclaimer in the
+//       documentation and/or other materials provided with the distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+
+import { ScalaParser } from './argument-parsers';
+import { JavaCompiler } from './java';
+
+export class ScalaCompiler extends JavaCompiler {
+    static get key() {
+        return 'scala';
+    }
+
+    getDefaultExecOptions() {
+        const execOptions = super.getDefaultExecOptions();
+        const javaHome = this.compilerProps(`compiler.${this.compiler.id}.java_home`);
+        if (javaHome) {
+            execOptions.env.JAVA_HOME = javaHome;
+        }
+
+        return execOptions;
+    }
+
+    filterUserOptions(userOptions) {
+        // filter options without extra arguments
+        userOptions = userOptions.filter(option =>
+            option !== '-Xscript');
+
+        const oneArgForbiddenList = new Set([
+            // -d directory
+            // Destination for generated class files
+            '-d',
+        ]);
+
+        // filter options with one argument
+        return super.filterUserOptionsWithArg(userOptions, oneArgForbiddenList);
+    }
+
+    optionsForFilter(filters) {
+        // Forcibly enable javap
+        filters.binary = true;
+
+        const scala2Opts = [
+            '-Xlint:_',
+        ];
+
+        const scala3Opts = [
+            '-deprecation',
+        ];
+
+        return this.compiler.semver.startsWith('3') ? scala3Opts : scala2Opts;
+    }
+
+    getArgumentParser() {
+        return ScalaParser;
+    }
+}