InstructionParser.java

/*
  InstructionParser.java

  (c) 2008-2013 Edward Swartz

  All rights reserved. This program and the accompanying materials
  are made available under the terms of the Eclipse Public License v1.0
  which accompanies this distribution, and is available at
  http://www.eclipse.org/legal/epl-v10.html
 */
package v9t9.tools.asm;

import java.util.ArrayList;
import java.util.List;

import v9t9.common.asm.IInstruction;

/**
 * This class parses instructions one at a time.
 * @author ejs
 *
 */
public class InstructionParser {
	private List<IInstructionParserStage> stages = new ArrayList<IInstructionParserStage>(1);
	
	/** 
	 * Create a new instruction parser that only handles standard
	 * instructions, e.g. from a disassembly without labels.
	 */
	public InstructionParser() {
	}
	
	public void appendStage(IInstructionParserStage stage) {
		stages.add(stage);
	}

	public IInstruction[] parse(String descr, String line) throws ParseException {
		for (IInstructionParserStage stage : stages) {
			IInstruction[] insts = stage.parse(descr, line);
			if (insts != null)
				return insts;
		}
		throw new ParseException("Unknown instruction or directive: " + line);
	}
}