Add interpret command

experiments/maki-interpreter/cli.js

@@ -0,0 +1,65 @@
+const fs = require("fs");
+const path = require("path");
+const { parse } = require("./");
+
+function parseFile(relativePath) {
+  const buffer = fs.readFileSync(path.join(__dirname, relativePath));
+  return parse(buffer);
+}
+
+class Group {}
+
+const System = {
+  getScriptGroup() {
+    return new Group();
+  }
+};
+
+function interpret({ commands: rawCommands, variables, types }) {
+  const commands = rawCommands.slice(0, 5);
+  const environment = {
+    System
+  };
+  const stack = [];
+  let i = 0;
+  while (i < commands.length) {
+    const command = commands[i];
+    switch (command.opcode) {
+      // push
+      case 1: {
+        // What are these? Do they have names?
+        const offsetIntoVariables = command.arguments[0];
+        const variable = variables[offsetIntoVariables];
+        console.log(variable);
+        stack.push(variable);
+        break;
+      }
+      // call
+      case 24: {
+        const funcDefinition = command.arguments[0];
+        const { name } = funcDefinition;
+        const variable = stack.pop();
+        const type = types[variable.type];
+        const obj = environment[type.name];
+        stack.push(obj[name]());
+        break;
+      }
+      // mov
+      case 48: {
+        const a = stack.pop();
+        const b = stack.pop();
+        stack.push(a);
+        break;
+      }
+    }
+    i++;
+  }
+}
+
+function main() {
+  const relativePath = process.argv[2];
+  const { commands, variables, types } = parseFile(relativePath);
+  interpret({ commands, variables, types });
+}
+
+main();

experiments/maki-interpreter/package.json

@@ -7,7 +7,8 @@
   "scripts": {
     "test": "jest -u",
     "tdd": "jest --watch",
-    "decompile": "cd reference/maki_decompiler_1.1 && perl mdc.pl ../../fixtures/standardframe.maki"
+    "decompile": "cd reference/maki_decompiler_1.1 && perl mdc.pl ../../fixtures/standardframe.maki",
+    "interpret": "node ./cli.js ./fixtures/standardframe.maki"
   },
   "devDependencies": {
     "glob": "^7.1.4",