Renamed class. Started adding Assembler class.

src/MOS6502.js

 
 var Memory = require('src/memory');
 
-class MOS6502{
+class CPU{
   constructor(){
     // Registers
     this.__PC = 0;   // Program Counter (16 bit)
     this.__irq = (q === true);
   }
 
-  CLK(){
+  reset(){
+    // TODO: Read memory address $FFFC - FFFD to find PC start location.
+    // TODO: Reset status registers that get changed on a reset.
+  }
+
+  clk(){
     if (this.__clkfn === null){
       this.__clkfn = (function(){
         // TODO: All the work!!
     return this.__clkfn;
   }
 
-  Memory(mem){
+  memory(mem){
     if (!(mem instanceof Memory))
       throw new ValueError("Expected Memory instance object.");
     this.__mem = mem;
 }
 
 
-module.exports = MOS6502;
+
+// ---------------------------------------------------------------------
+// ---------------------------------------------------------------------
+
+function toHexString(v, l){
+  l = (typeof(l) === 'number' && (l === 8 || l === 16)) ? l : 8;
+  var r = v.toString(16);
+  if (r.length < 2)
+    r = "0" + r;
+  if (l === 16 && r.length < 4)
+    r = ((r.length === 2) ? "00" : "0") + r;
+  return r;
+}
+
+class Assembler{
+  constructor(initpc){
+    // Labels that hold variable values.
+    this.__varlabels = {};
+    // Labels that hold jump/branch locations.
+    this.__jmplabels = {};
+    // Program counter to track where in the code/memory a
+    // operation is located.
+    this.__PC = (initpc >= 0) ? initpc : 0;
+  }
+
+  compile(src){
+    var op = [];
+    src.split("\n").forEach((line)=>{
+      line = line.trim();
+      if (line[0] !== ";"){ // Skip comment lines.
+        line = line.split(";")[0].trim(); // Take out any trailing comments.
+        var tokens = line.split(/\s+/);
+
+        if (tokens[0] === 'define'){
+          // Variable label!!
+        } else if (tokens[0][tokens[0].length - 1] === ':'){
+          // Jump label!!
+        } else if (tokens[0].length === 3){
+          // Possible op code.
+          switch(tokens[0].toLowerCase()){
+            case 'adc':
+              break;
+            case 'and':
+              break;
+            case 'asl':
+              break;
+            case 'bcc':
+              break;
+            case 'bcs':
+              break;
+            case 'beq':
+              break;
+            case 'bit':
+              break;
+            case 'bmi':
+              break;
+            case 'bne':
+              break;
+            case 'bpl':
+              break;
+            case 'brk':
+              break;
+            case 'bvc':
+              break;
+            case 'bvs':
+              break;
+            case 'clc':
+              break;
+            case 'cld':
+              break;
+            case 'cli':
+              break;
+            case 'clv':
+              break;
+            case 'cmp':
+              break;
+            case 'cpx':
+              break;
+            case 'cpy':
+              break;
+            case 'dec':
+              break;
+            case 'dex':
+              break;
+            case 'dey':
+              break;
+            case 'eor':
+              break;
+            case 'inc':
+              break;
+            case 'inx':
+              break;
+            case 'iny':
+              break;
+            case 'jmp':
+              break;
+            case 'jsr':
+              break;
+            case 'lda':
+              break;
+            case 'ldx':
+              break;
+            case 'ldy':
+              break;
+            case 'lsr':
+              break;
+            case 'nop':
+              break;
+            case 'ora':
+              break;
+            case 'pha':
+              break;
+            case 'php':
+              break;
+            case 'pla':
+              break;
+            case 'plp':
+              break;
+            case 'rol':
+              break;
+            case 'ror':
+              break;
+            case 'rti':
+              break;
+            case 'rts':
+              break;
+            case 'sbc':
+              break;
+            case 'sec':
+              break;
+            case 'sed':
+              break;
+            case 'sei':
+              break;
+            case 'sta':
+              break;
+            case 'stx':
+              break;
+            case 'sty':
+              break;
+            case 'tax':
+              break;
+            case 'tay':
+              break;
+            case 'tsx':
+              break;
+            case 'txa':
+              break;
+            case 'txs':
+              break;
+            case 'tya':
+              break;
+            default:
+              throw new Error("Unknown op-code '" + tokens[0].toUpperCase() + "' at program address " + toHexString(this.__PC));
+          }
+        } else {
+          throw new Error("Failed to compile line '" + line + "' at program address " + toHexString(this.__PC));
+        }
+      }
+    });
+    return new Uint8Array(op);
+  }
+}
+
+
+
+// ---------------------------------------------------------------------
+// ---------------------------------------------------------------------
+
+module.exports = {
+  CPU: CPU,
+  Assembler: Assembler
+};
+
+
+
+