Early stab at an Applesoft compiler. Needs to be redesigned/refactored.
This commit is contained in:
Robert Greene
parent
822b528bf5
commit
98a281f3bc
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/*
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* AppleCommander - An Apple ][ image utility.
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* Copyright (C) 2003 by Robert Greene
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* robgreene at users.sourceforge.net
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package com.webcodepro.applecommander.compiler;
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import com.webcodepro.applecommander.storage.FileEntry;
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import com.webcodepro.applecommander.util.ApplesoftToken;
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import com.webcodepro.applecommander.util.ApplesoftTokenizer;
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import com.webcodepro.applecommander.util.ApplesoftTokens;
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import java.io.ByteArrayOutputStream;
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import java.io.PrintWriter;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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/**
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* Compile the given file as an Applesoft file.
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* <p>
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* Date created: Nov 2, 2002 10:04:10 PM
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* @author: Rob Greene
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*/
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public class ApplesoftCompiler implements ApplesoftTokens {
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private ApplesoftTokenizer tokenizer;
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private List stringVariables = new ArrayList();
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private List integerVariables = new ArrayList();
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private List floatVariables = new ArrayList();
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private Map stringConstants = new HashMap();
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private Map integerConstants = new HashMap();
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private Map floatConstants = new HashMap();
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/**
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* Constructor for ApplesoftCompiler.
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*/
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public ApplesoftCompiler(FileEntry fileEntry) {
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super();
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tokenizer = new ApplesoftTokenizer(fileEntry);
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}
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/**
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* Compile the given FileEntry and return the assembly code.
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*/
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public byte[] compile() {
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ByteArrayOutputStream assemblyStream = new ByteArrayOutputStream();
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PrintWriter assemblyWriter = new PrintWriter(assemblyStream);
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StringBuffer sourceLine = new StringBuffer();
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StringBuffer sourceAssembly = new StringBuffer();
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while (tokenizer.hasMoreTokens()) {
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ApplesoftToken token = tokenizer.getNextToken();
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if (token == null) {
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break;
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} else if (token.isLineNumber()) {
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if (sourceLine.length() > 0) {
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assemblyWriter.println(sourceLine.toString());
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assemblyWriter.println(sourceAssembly.toString());
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sourceLine.setLength(0);
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sourceAssembly.setLength(0);
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}
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sourceAssembly.append("LINE");
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sourceAssembly.append(token.getLineNumber());
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sourceAssembly.append(":\n");
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sourceLine.append("* ");
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sourceLine.append(token.getLineNumber());
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sourceLine.append(" ");
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} else if (token.isToken()) {
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sourceLine.append(token.getTokenString());
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processToken(sourceAssembly, sourceLine, token, tokenizer);
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} else if (token.isString()) {
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sourceLine.append(token.getStringValue());
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// FIXME - process string/expressions!
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}
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}
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if (sourceLine.length() > 0) {
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assemblyWriter.println(sourceLine.toString());
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assemblyWriter.println(sourceAssembly.toString());
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sourceLine.setLength(0);
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sourceAssembly.setLength(0);
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}
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if (!stringConstants.isEmpty()) {
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assemblyWriter.println("\n* String constant values:");
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Iterator iterator = stringConstants.keySet().iterator();
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while (iterator.hasNext()) {
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String name = (String) iterator.next();
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assemblyWriter.print(name);
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assemblyWriter.print(":\tASC ");
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assemblyWriter.println(stringConstants.get(name));
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assemblyWriter.println("\tHEX 00");
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}
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}
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if (!integerConstants.isEmpty()) {
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assemblyWriter.println("\n* Integer constant values:");
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Iterator iterator = integerConstants.keySet().iterator();
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while (iterator.hasNext()) {
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String name = (String) iterator.next();
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assemblyWriter.print(name);
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assemblyWriter.print(":\tDW ");
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assemblyWriter.println(integerConstants.get(name));
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}
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}
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if (!integerVariables.isEmpty()) {
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assemblyWriter.println("\n* Integer variables:");
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for (int i = 0; i<integerVariables.size(); i++) {
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assemblyWriter.print(integerVariables.get(i));
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assemblyWriter.println(": DW 0");
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}
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}
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if (!floatVariables.isEmpty()) {
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assemblyWriter.println("\n* Float variables:");
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for (int i = 0; i<floatVariables.size(); i++) {
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assemblyWriter.print(floatVariables.get(i));
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assemblyWriter.println(": DS 5");
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}
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}
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assemblyWriter.close();
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return assemblyStream.toByteArray();
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}
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/**
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* Process and individual token.
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*/
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protected void processToken(StringBuffer sourceAssembly,
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StringBuffer sourceLine, ApplesoftToken token, ApplesoftTokenizer tokenizer) {
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String expr = null;
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switch (token.getTokenValue()) {
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case HOME: sourceAssembly.append("\tJSR $FC58\n");
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break;
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case STOP:
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case RETURN:
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case END: sourceAssembly.append("\tRTS\n");
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break;
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case TEXT: sourceAssembly.append("\tJSR $FB2F\n");
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break;
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case HGR: sourceAssembly.append("\tJSR $F3E2\n");
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break;
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case HGR2: sourceAssembly.append("\tJSR $F3D8\n");
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break;
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case GR: sourceAssembly.append("\tJSR $FB40\n");
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break;
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case INVERSE:
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sourceAssembly.append("\tLDA #$3F\n");
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sourceAssembly.append("\tSTA $32\n");
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break;
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case NORMAL:
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sourceAssembly.append("\tLDA #$FF\n");
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sourceAssembly.append("\tSTA $32\n");
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break;
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case FLASH:
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sourceAssembly.append("\tLDA #$7F\n");
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sourceAssembly.append("\tSTA $32\n");
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break;
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case VTAB: expr = evaluateExpression(sourceAssembly, sourceLine);
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sourceAssembly.append("\tLDA ");
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sourceAssembly.append(expr);
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sourceAssembly.append("\n");
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sourceAssembly.append("\tSTA $25\n");
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sourceAssembly.append("\tJSR $FC66\n");
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break;
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case HTAB: expr = evaluateExpression(sourceAssembly, sourceLine);
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sourceAssembly.append("\tLDA ");
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sourceAssembly.append(expr);
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sourceAssembly.append("\n");
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sourceAssembly.append("\tSTA $24\n");
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break;
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case HCOLOR:
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expr = evaluateExpression(sourceAssembly, sourceLine);
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sourceAssembly.append("\tLDX ");
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sourceAssembly.append(expr);
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sourceAssembly.append("\n");
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sourceAssembly.append("\tJSR $F6F0\n");
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break;
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case PRINT:
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expr = evaluateExpression(sourceAssembly, sourceLine);
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if (isIntegerVariable(expr)) {
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throw new IllegalArgumentException("Integer not supported in print: " + expr);
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} else if (isFloatVariable(expr)) {
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sourceAssembly.append("\tLDY #>");
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sourceAssembly.append(expr);
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sourceAssembly.append("\n");
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sourceAssembly.append("\tLDA #<");
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sourceAssembly.append(expr);
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sourceAssembly.append("\n");
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sourceAssembly.append("\tJSR $EAF9\t; MOVFM\n");
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sourceAssembly.append("\tJSR $ED2E\t; PRNTFAC\n");
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} else if (isStringVariable(expr)) {
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sourceAssembly.append("\tLDY #0\n");
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sourceAssembly.append(":loop\tLDA ");
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sourceAssembly.append(expr);
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sourceAssembly.append(",Y\n");
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sourceAssembly.append("\tBEQ :end\n");
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sourceAssembly.append("\tJSR COUT\n");
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sourceAssembly.append("\tINY\n");
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sourceAssembly.append("\tBNE :loop\n");
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sourceAssembly.append(":end\n");
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} else {
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throw new IllegalArgumentException("Invalid expr in print: " + expr);
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}
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break;
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case FOR:
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String loopVariable = evaluateExpression(sourceAssembly, sourceLine);
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if (!isFloatVariable(loopVariable)) {
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throw new IllegalArgumentException("FOR loop argument must be a float");
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}
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token = tokenizer.getNextToken();
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if (token.getTokenValue() != EQUALS) {
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throw new IllegalArgumentException("FOR requires =");
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}
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sourceLine.append(token.getTokenString());
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String startValue = evaluateExpression(sourceAssembly, sourceLine);
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token = tokenizer.getNextToken();
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if (token.getTokenValue() != TO) {
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throw new IllegalArgumentException("FOR requires TO");
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}
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sourceLine.append(token.getTokenString());
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String endValue = evaluateExpression(sourceAssembly, sourceLine);
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if (isFloatVariable(loopVariable)) {
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// FIXME: Assumes start/end are integer
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sourceAssembly.append("\tLDY ");
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sourceAssembly.append(startValue);
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sourceAssembly.append("\n");
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sourceAssembly.append("\tLDA ");
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sourceAssembly.append(startValue);
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sourceAssembly.append("\n");
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sourceAssembly.append("\tJSR $E2F2 ; GIVAYF\n");
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sourceAssembly.append("\tLDY #>");
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sourceAssembly.append(loopVariable);
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sourceAssembly.append("\n");
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sourceAssembly.append("\tLDX #<");
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sourceAssembly.append(loopVariable);
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sourceAssembly.append("\n");
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sourceAssembly.append("\tJSR $EB2B ; MOVMF\n");
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}
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break;
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}
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}
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/**
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* Evaluate an expression and return the variable name that
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* contains the value.
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*/
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protected String evaluateExpression(StringBuffer sourceAssembly, StringBuffer sourceLine) {
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// FIXME: no type checking available
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ApplesoftToken token = tokenizer.getNextToken();
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if (token.isString()) {
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String value = token.getStringValue();
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sourceLine.append(value);
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if (isIntegerNumber(value)) {
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return addIntegerConstant(value);
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} else if (value.startsWith("\"")) {
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return addStringConstant(value);
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} else { // assume variable name
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return addVariable(value);
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}
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} else {
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throw new IllegalArgumentException("Oops!");
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}
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}
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/**
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* Indicates if this string is a number.
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*/
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protected boolean isIntegerNumber(String value) {
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for (int i=0; i<value.length(); i++) {
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if (!Character.isDigit(value.charAt(i))) {
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return false;
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}
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}
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return true;
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}
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protected String addIntegerConstant(String value) {
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String name = "INT" + value;
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if (!integerConstants.containsKey(name)) {
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integerConstants.put(name, value);
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}
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return name;
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}
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protected String addStringConstant(String value) {
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String name = "STR" + stringConstants.size();
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if (stringConstants.containsValue(value)) {
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Iterator iterator = stringConstants.keySet().iterator();
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while (iterator.hasNext()) {
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String key = (String) iterator.next();
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String keyValue = (String) stringConstants.get(key);
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if (value.equals(keyValue)) {
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name = key;
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break;
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}
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}
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} else {
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stringConstants.put(name, value);
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}
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return name;
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}
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protected String addVariable(String variableName) {
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if (variableName.endsWith("$")) {
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variableName = "STR" + variableName;
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if (!stringVariables.contains(variableName)) {
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stringVariables.add(variableName);
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}
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} else if (variableName.endsWith("%")) {
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variableName = "INT" + variableName;
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if (!integerVariables.contains(variableName)) {
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integerVariables.add(variableName);
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}
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} else {
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variableName = "FP" + variableName;
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if (!floatVariables.contains(variableName)) {
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floatVariables.add(variableName);
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}
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}
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return variableName;
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}
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protected boolean isIntegerVariable(String name) {
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return integerVariables.contains(name) || integerConstants.containsKey(name);
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}
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protected boolean isFloatVariable(String name) {
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return floatVariables.contains(name) || floatConstants.containsKey(name);
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}
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protected boolean isStringVariable(String name) {
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return stringVariables.contains(name) || stringConstants.containsKey(name);
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}
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}
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