feat: add support for CPU instruction (#7)

Author: idleberg

src/nsl/instruction/CPUInstruction.java

@@ -0,0 +1,69 @@
+/*
+ * CPUInstruction.java
+ */
+
+package nsl.instruction;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.EnumSet;
+import java.util.HashSet;
+import java.util.Set;
+import nsl.*;
+import nsl.expression.*;
+
+/**
+ * @author Jan
+ */
+public class CPUInstruction extends AssembleExpression {
+	public static final String name = "CPU";
+
+	private static final Set<String> VALID_CPUS = new HashSet<>(Arrays.asList("x86", "amd64"));
+
+	private final Expression cpu;
+
+	/**
+	 * Class constructor.
+	 *
+	 * @param returns the number of values to return
+	 */
+	public CPUInstruction(int returns) {
+		if (!ScriptParser.inGlobalContext())
+			throw new NslContextException(EnumSet.of(NslContext.Global), name);
+		if (returns > 0) throw new NslReturnValueException(name);
+
+		ArrayList<Expression> paramsList = Expression.matchList();
+		if (paramsList.size() != 1) throw new NslArgumentException(name, 1);
+
+		this.cpu = paramsList.get(0);
+		if (!ExpressionType.isString(this.cpu))
+			throw new NslArgumentException(name, 1, ExpressionType.String);
+
+		String cpuValue = this.cpu.getStringValue();
+		if (!VALID_CPUS.contains(cpuValue)) {
+			throw new NslException(
+					String.format(
+							"%s: Invalid CPU architecture \"%s\". Valid values are: %s",
+							name, cpuValue, String.join(", ", VALID_CPUS)),
+					true);
+		}
+	}
+
+	/** Assembles the source code. */
+	@Override
+	public void assemble() throws IOException {
+		AssembleExpression.assembleIfRequired(this.cpu);
+		ScriptParser.writeLine(name + " " + this.cpu);
+	}
+
+	/**
+	 * Assembles the source code.
+	 *
+	 * @param var the variable to assign the value to
+	 */
+	@Override
+	public void assemble(Register var) throws IOException {
+		throw new UnsupportedOperationException("Not supported.");
+	}
+}

src/nsl/statement/Statement.java

@@ -93,6 +93,7 @@ public static AssembleExpression matchInstruction(int returns) {
 			return new ComponentTextInstruction(returns);
 		if (ScriptParser.tokenizer.match(CopyFilesInstruction.name))
 			return new CopyFilesInstruction(returns);
+		if (ScriptParser.tokenizer.match(CPUInstruction.name)) return new CPUInstruction(returns);
 		if (ScriptParser.tokenizer.match(CRCCheckInstruction.name))
 			return new CRCCheckInstruction(returns);
 		if (ScriptParser.tokenizer.match(CreateDirectoryInstruction.name))