MOS/6502/tpl.js contains objects and functions used by Tokenizer and Parser to allow them to codify 6502 assembly.

src/MOS/6502/tpl.js

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+// Each array orders op codes as...
+// [<immediate>, <zero page>, <zero page X/Y>, <absolute>, <absolute X>, <absolute Y>, <Indirect X>, <Indirect Y>, <Indirect>, <accumulator>]
+// If an opcode does not support a particular format, null will be in that space.
+// NOTE: Opcode that do not have arguments will store their opcode value directly (no array).
+const CODES = {
+  "ADC":[0x69, 0x65, 0x75, 0x6D, 0x7D, 0x79, 0x61, 0x71, null, null],
+  "AND":[0x29, 0x25, 0x35, 0x2D, 0x3D, 0x39, 0x21, 0x31, null, null],
+  "ASL":[null, 0x06, 0x16, 0x0E, 0x1E, null, null, null, null, 0x0A],
+  "BCC":0x90,
+  "BCS":0xB0,
+  "BEQ":0xF0,
+  "BIT":[null, 0x24, null, 0x2C, null, null, null, null, null, null],
+  "BMI":0x30,
+  "BNE":0xD0,
+  "BPL":0x10,
+  "BRK":0x00,
+  "BVC":0x50,
+  "BVS":0x70,
+  "CLC":0x18,
+  "CLD":0xD8,
+  "CLI":0x58,
+  "CLV":0xB8,
+  "CMP":[0xC9, 0xC5, 0xD5, 0xCD, 0xDD, 0xD9, 0xC1, 0xD1, null, null],
+  "CPX":[0xE0, 0xE4, null, 0xEC, null, null, null, null, null, null],
+  "CPY":[0xC0, 0xC4, null, 0xCC, null, null, null, null, null, null],
+  "DEC":[null, 0xC6, 0xD6, 0xCE, 0xDE, null, null, null, null, null],
+  "DEX":0xCA,
+  "DEY":0x88,
+  "EOR":[0x49, 0x45, 0x55, 0x4D, 0x5D, 0x59, 0x41, 0x51, null, null],
+  "INC":[null, 0xE6, 0xF6, 0xEE, 0xFE, null, null, null, null, null],
+  "INX":0xE8,
+  "INY":0xC8,
+  "JMP":[null, null, null, 0x4C, null, null, null, null, 0x6C, null],
+  "JSR":[null, null, null, 0x20, null, null, null, null, null, null],
+  "LDA":[0xA9, 0xA5, 0xB5, 0xAD, 0xBD, 0xB9, 0xA1, 0xB1, null, null],
+  "LDX":[0xA2, 0xA6, 0xB6, 0xAE, 0xBE, null, null, null, null, null],
+  "LDY":[0xA0, 0xA4, 0xB4, 0xAC, 0xBC, null, null, null, null, null],
+  "LSR":[null, 0x46, 0x56, 0x4E, 0x5E, null, null, null, null, 0x4A],
+  "NOP":0xEA,
+  "ORA":[0x09, 0x05, 0x15, 0x0D, 0x1D, 0x19, 0x01, 0x11, null, null],
+  "PHA":0x48,
+  "PHP":0x08,
+  "PLA":0x68,
+  "PLP":0x28,
+  "ROL":[null, 0x26, 0x36, 0x2E, 0x3E, null, null, null, null, 0x2A],
+  "ROR":[null, 0x66, 0x76, 0x6E, 0x7E, null, null, null, null, 0x6A],
+  "RTI":0x40,
+  "RTS":0x60,
+  "SBC":[0xE9, 0xE5, 0xF5, 0xED, 0xFD, 0xF9, 0xE1, 0xF1, null, null],
+  "SEC":0x38,
+  "SED":0xF8,
+  "SEI":0x78,
+  "STA":[null, 0x85, 0x95, 0x8D, 0x9D, 0x99, 0x81, 0x91, null, null],
+  "STX":[null, 0x86, 0x96, 0x8E, null, null, null, null, null, null],
+  "STY":[null, 0x84, 0x94, 0x8C, null, null, null, null, null, null],
+  "TAX":0xAA,
+  "TAY":0xA8,
+  "TSX":0xBA,
+  "TXA":0x8A,
+  "TXS":0x9A,
+  "TYA":0x98
+};
+var NAMES = Object.keys(CODES);
+
+
+
+module.exports = Object.freeze({
+  OPInfo:{
+    MODES:{
+      IMMEDIATE: 0,
+      ZEROPAGE: 1,
+      ZEROPAGEXY: 2,
+      ABSOLUTE: 3,
+      ABSOLUTEX: 4,
+      ABSOLUTEY: 5,
+      INDIRECTX: 6,
+      INDIRECTY: 7,
+      INDIRECT: 8,
+      ACCUMULATOR: 9
+    },
+    CODES: CODES,
+    NAMES: NAMES,
+    isCode:function(op){return (NAMES.indexOf(op) >= 0);},
+    getCode:function(op, mode){
+      if (NAMES.indexOf(op) >= 0){
+        if (typeof(CODES[op]) === 'number')
+          return CODES[op];
+        return (!(mode >= 0 && mode <= 9)) ? CODES[op][mode] : null;
+      }
+      return null;
+    }
+  },
+
+  parseOpCodes: function(parser){
+    return (function(){
+      let line = this.stream.line();
+      let col = this.stream.col();
+      let val = this.stream.next();
+      let mode = 0; // Guess between absolute and zero page.
+      if (this.isOp("#")){
+        this.stream.next();
+        mode = 1; // Immediate
+      } else if (this.isPunc("(")){
+        mode = 2; // Indirect
+      } 
+      return {
+        type: "opcode",
+        op: val,
+        args: this.parseDelimited(null, null, ",", this.parseExpression.bind(this)),
+        mode: mode,
+        line: line,
+        col: col
+      };
+    }).bind(parser);
+  }
+});