add step()

1 files changed, 75 insertions, 0 deletions

diff --git a/src/vm/vm.js b/src/vm/vm.js
index 1ec890b..6add546 100644
--- a/src/vm/vm.js
+++ b/src/vm/vm.js
@@ -31,6 +31,81 @@ class Warrior {
 class RedcodeVm {
 	constructor(coresize, warriors) {
 		this.core = new Core(coresize);
+		this.warriors = this.core.initialize(warriors)
+			.map(start => new Warrior(start));
+	}
+
+	step() {
+		let running = 0;
+
+		for (let warrior of this.warriors) {
+			if (warrior.isDead()) {
+				continue;
+			} else {
+				running += 1;
+			}
+
+			const pc = warrior.next();
+			const ins = this.core.data[pc];
+			let next;
+			switch(ins.opcode) {
+				case 'DAT':
+					next = DAT(this.core, pc, ins);
+					break;
+				case 'MOV':
+					next = MOV(this.core, pc, ins);
+					break;
+				case 'ADD':
+					next = ADD(this.core, pc, ins);
+					break;
+				case 'SUB':
+					next = SUB(this.core, pc, ins);
+					break;
+				case 'CMP':
+					next = CMP(this.core, pc, ins);
+					break;
+				case 'SLT':
+					next = SLT(this.core, pc, ins);
+					break;
+				case 'JMP':
+					next = JMP(this.core, pc, ins);
+					break;
+				case 'JMZ':
+					next = JMZ(this.core, pc, ins);
+					break;
+				case 'JMN':
+					next = JMN(this.core, pc, ins);
+					break;
+				case 'DJN':
+					next = DJN(this.core, pc, ins);
+					break;
+				case 'SPL':
+					next = SPL(this.core, pc, ins);
+					break;
+				default:
+					throw `core corruption: bad instruction ${ins}`
+			}
+		}
 		
+		return running;
+	}
+
+	run(maxSteps) {
+		let steps = 0;
+		let running = this.warriors.length;
+		while(running > 0 && steps < maxSteps) {
+			running = this.step();
+			steps += 1;
+		}
+
+		if (running !== 0) {
+			console.log("draw, maximum steps exceeded");
+		}
+		for (let i=0; i<this.warriors.length; i++) {
+			console.log(`${i} running: ${!this.warriors[i].isDead()}`);
+		}
 	}
 };
+
+
+exports.RedcodeVm = RedcodeVm;