Create SurfaceAngleMask (#1215)

worldedit-core/src/main/java/com/fastasyncworldedit/core/extension/factory/parser/mask/SurfaceAngleMaskParser.java

@@ -0,0 +1,45 @@
+package com.fastasyncworldedit.core.extension.factory.parser.mask;
+
+import com.fastasyncworldedit.core.extension.factory.parser.RichParser;
+import com.fastasyncworldedit.core.function.mask.SurfaceAngleMask;
+import com.sk89q.worldedit.WorldEdit;
+import com.sk89q.worldedit.command.util.SuggestionHelper;
+import com.sk89q.worldedit.extension.input.InputParseException;
+import com.sk89q.worldedit.extension.input.ParserContext;
+import com.sk89q.worldedit.function.mask.Mask;
+
+import javax.annotation.Nonnull;
+import java.util.stream.Stream;
+
+public class SurfaceAngleMaskParser extends RichParser<Mask> {
+
+    /**
+     * Create a new surface angle mask parser with a defined prefix for the result, e.g. {@code #simplex}.
+     *
+     * @param worldEdit the worldedit instance.
+     */
+    public SurfaceAngleMaskParser(WorldEdit worldEdit) {
+        super(worldEdit, "#surfaceangle");
+    }
+
+    @Override
+    protected Stream<String> getSuggestions(String argumentInput, int index) {
+        if (index <= 2) {
+            return SuggestionHelper.suggestPositiveDoubles(argumentInput);
+        }
+        return Stream.empty();
+    }
+
+    public Mask parseFromInput(@Nonnull String[] arguments, ParserContext context) throws InputParseException {
+        if (arguments.length > 3) {
+            return null;
+        }
+
+        double min = Double.parseDouble(arguments[0]);
+        double max = Double.parseDouble(arguments[1]);
+
+        int size = (arguments.length > 2 ? Integer.parseInt(arguments[2]) : 1);
+        return new SurfaceAngleMask(context.getExtent(), min, max, size);
+    }
+
+}