60 lines
1.9 KiB
TypeScript
60 lines
1.9 KiB
TypeScript
import {
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LuaBuiltinFunction,
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type LuaEnv,
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LuaMultiRes,
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type LuaStackFrame,
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type LuaValue,
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} from "../runtime.ts";
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import { parseBlock } from "../parse.ts";
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import { evalStatement } from "../eval.ts";
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// Returns a function (callable chunk) or (nil, "error message") pair.
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export function luaLoad(code: LuaValue, sf: LuaStackFrame): LuaValue {
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const s = typeof code === "string" ? code : String(code);
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try {
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const block = parseBlock(s, sf.astCtx || {});
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const globalEnvMaybe = sf.threadLocal.get("_GLOBAL");
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// Be vocal when no _GLOBAL is set
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if (!globalEnvMaybe) {
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console.warn("load() called without _GLOBAL in thread-local environment");
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return new LuaMultiRes([null, "Global environment not set"]);
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}
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const globalEnv: LuaEnv = globalEnvMaybe as LuaEnv;
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const runner = new LuaBuiltinFunction({
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callback: async (innerSf: LuaStackFrame) => {
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const res = await evalStatement(block, globalEnv, innerSf, true);
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if (res === undefined) {
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return null;
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} else {
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if (
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res &&
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typeof res === "object" &&
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(res as any).ctrl === "return"
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) {
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return new LuaMultiRes((res as any).values);
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}
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if (res && typeof res === "object" && (res as any).ctrl === "break") {
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throw new Error("break outside loop");
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}
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if (res && typeof res === "object" && (res as any).ctrl === "goto") {
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throw new Error("unexpected goto signal");
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}
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return null;
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}
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},
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description: "Executes the Lua chunk compiled by `load`.",
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signatures: ["function(...)"],
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returns: [{ description: "Values returned by the compiled chunk." }],
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});
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return runner;
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} catch (e: any) {
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const msg = e && typeof e.message === "string" ? e.message : String(e);
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return new LuaMultiRes([null, msg]);
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}
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}
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