From 29ed5eacb80cdfe49bff0d9335241dc3e2188981 Mon Sep 17 00:00:00 2001
From: sanine-a <sanine.not@pm.me>
Date: Tue, 23 May 2023 14:15:18 -0500
Subject: add step()

---
 src/vm/core.js | 21 ++++++++++++++++
 src/vm/vm.js   | 75 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 96 insertions(+)

diff --git a/src/vm/core.js b/src/vm/core.js
index 184be00..a8fbce7 100644
--- a/src/vm/core.js
+++ b/src/vm/core.js
@@ -81,6 +81,27 @@ class Core {
 	}
 
 
+	initialize(programs) {
+		const ranges = this.getRanges(
+			programs.map(p => p.program.length)
+		)
+
+		const pc = [];
+		for (let i=0; i<programs.length; i++) {
+			const range = ranges[i];
+			const program = programs[i].program;
+			pc.push(programs[i].start + range.start);
+
+			for (let j=0; j<program.length; j++) {
+				const index = this.normalize(range.start, j);
+				this.data[index] = JSON.parse(JSON.stringify(program[j]));
+			}
+		}
+
+		return pc;
+	}
+
+
 	normalize(pc, value) {
 		return mod((pc + value), this.data.length);
 	}
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;
-- 
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