From 51215bd922d57f2ddd03deac6295f3e9267c7c3c Mon Sep 17 00:00:00 2001
From: juliexxia <juliexxia@google.com>
Date: Tue, 14 Aug 2018 10:28:35 -0700
Subject: Create new config module that is responsible for creating
 BuildSetting descriptor objects.

Build settings are units of configuration i.e. a key/value pair of a setting (e.g. cpu) and a value (e.g. ppc). A build setting descriptor is used to describe what kind of build setting a skylark rule is (if any at all). The BuildSettingDescriptor implementation of the API describes two facets of the build setting rule: the type of the value and whether or not the setting is settable on the command line.

The methods exposed here will eventually be hooked up to a new parameter in the <code> rule() </code> function. Validation for these restrictions will also happen in a later CL attached to the same bug.

PiperOrigin-RevId: 208669663
---
 .../build/lib/analysis/skylark/SkylarkConfig.java  | 89 ++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 src/main/java/com/google/devtools/build/lib/analysis/skylark/SkylarkConfig.java

(limited to 'src/main/java/com/google/devtools/build/lib/analysis/skylark/SkylarkConfig.java')

diff --git a/src/main/java/com/google/devtools/build/lib/analysis/skylark/SkylarkConfig.java b/src/main/java/com/google/devtools/build/lib/analysis/skylark/SkylarkConfig.java
new file mode 100644
index 0000000000..a75cd5c829
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/analysis/skylark/SkylarkConfig.java
@@ -0,0 +1,89 @@
+// Copyright 2018 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.
+
+package com.google.devtools.build.lib.analysis.skylark;
+
+import static com.google.devtools.build.lib.packages.BuildType.LABEL;
+import static com.google.devtools.build.lib.packages.BuildType.LABEL_LIST;
+import static com.google.devtools.build.lib.syntax.Type.BOOLEAN;
+import static com.google.devtools.build.lib.syntax.Type.INTEGER;
+import static com.google.devtools.build.lib.syntax.Type.STRING;
+import static com.google.devtools.build.lib.syntax.Type.STRING_LIST;
+
+import com.google.devtools.build.lib.skylarkbuildapi.SkylarkConfigApi;
+import com.google.devtools.build.lib.skylarkinterface.SkylarkPrinter;
+import com.google.devtools.build.lib.syntax.Type;
+
+/**
+ * Skylark namespace for creating build setting descriptors.
+ */
+public class SkylarkConfig implements SkylarkConfigApi {
+
+  @Override
+  public BuildSettingDescriptor intSetting(Boolean flag) {
+    return new BuildSettingDescriptor(flag, INTEGER);
+  }
+
+  @Override
+  public BuildSettingDescriptor boolSetting(Boolean flag) {
+    return new BuildSettingDescriptor(flag, BOOLEAN);
+  }
+
+  @Override
+  public BuildSettingDescriptor stringSetting(Boolean flag) {
+    return new BuildSettingDescriptor(flag, STRING);
+  }
+
+  @Override
+  public BuildSettingDescriptor stringListSetting(Boolean flag) {
+    return new BuildSettingDescriptor(flag, STRING_LIST);
+  }
+
+  @Override
+  public BuildSettingDescriptor labelSetting(Boolean flag) {
+    return new BuildSettingDescriptor(flag, LABEL);
+  }
+
+  @Override
+  public BuildSettingDescriptor labelListSetting(Boolean flag) {
+    return new BuildSettingDescriptor(flag, LABEL_LIST);
+  }
+
+  @Override
+  public void repr(SkylarkPrinter printer) {
+    printer.append("<config>");
+  }
+
+  /**
+   * An object that describes what time of build setting a skylark rule is (if any type).
+   */
+  public static final class BuildSettingDescriptor implements SkylarkConfigApi.BuildSettingApi {
+    private boolean isFlag;
+    private Type<?> type;
+
+    BuildSettingDescriptor(boolean isFlag, Type<?> type) {
+      this.isFlag = isFlag;
+      this.type = type;
+    }
+
+    public Type<?> getType() {
+      return type;
+    }
+
+    @Override
+    public void repr(SkylarkPrinter printer) {
+      printer.append("<build_setting." + type.toString() + ">");
+    }
+  }
+}
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