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Lua work

pull/1102/head
Zef Hemel 2024-09-27 17:09:25 +02:00
parent aa712ed8f4
commit cdcce0d828
8 changed files with 94 additions and 12 deletions
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2
common/space_lua/ast.ts
View File

@ -93,7 +93,7 @@ export type LuaLocalFunctionStatement = {
export type LuaFunctionName = {
type: "FunctionName";
propNames?: string[];
propNames: string[];
colonName?: string;
};

13
common/space_lua/eval.test.ts
View File

@ -185,4 +185,17 @@ Deno.test("Statement evaluation", async () => {
env7,
);
assertEquals(env7.get("c"), 3);
// Function definition and calling
const env8 = new LuaEnv();
env8.set("print", new LuaNativeJSFunction(console.log));
await evalBlock(
`
function test(a)
return a + 1
end
print("3 + 1 = " .. test(3))
`,
env8,
);
});

37
common/space_lua/eval.ts
View File

@ -6,11 +6,15 @@ import type {
import { evalPromiseValues } from "$common/space_lua/util.ts";
import {
type ILuaFunction,
type ILuaGettable,
type ILuaSettable,
LuaBreak,
LuaEnv,
LuaFunction,
luaGet,
luaLen,
type LuaLValueContainer,
LuaReturn,
LuaTable,
luaTruthy,
type LuaValue,
@ -356,6 +360,39 @@ export async function evalStatement(
case "FunctionCallStatement": {
return evalExpression(s.call, env);
}
case "Function": {
let body = s.body;
let propNames = s.name.propNames;
if (s.name.colonName) {
// function hello:there() -> function hello.there(self) transformation
body = {
...s.body,
parameters: ["self", ...s.body.parameters],
};
propNames = [...s.name.propNames, s.name.colonName];
}
let settable: ILuaSettable & ILuaGettable = env;
for (let i = 0; i < propNames.length - 1; i++) {
settable = settable.get(propNames[i]);
if (!settable) {
throw new Error(
`Cannot find property ${propNames[i]}`,
);
}
}
settable.set(
propNames[propNames.length - 1],
new LuaFunction(body, env),
);
break;
}
case "Return": {
throw new LuaReturn(
await evalPromiseValues(
s.expressions.map((value) => evalExpression(value, env)),
),
);
}
default:
throw new Error(`Unknown statement type ${s.type}`);
}

2
common/space_lua/lua.grammar
View File

@ -19,7 +19,7 @@
Block { statement* ReturnStatement? }
ReturnStatement { kw<"return"> exp? ";"?}
ReturnStatement { kw<"return"> ExpList? ";"?}
@skip { newline | space | Comment }

10
common/space_lua/parse-lua.js
View File

@ -3,9 +3,9 @@ import {LRParser} from "@lezer/lr"
const spec_identifier = {__proto__:null,break:16, goto:20, do:24, end:26, while:30, nil:32, true:34, false:36, or:80, and:82, not:104, function:114, repeat:122, until:124, if:128, then:130, elseif:132, else:134, for:138, in:146, local:156, return:172}
export const parser = LRParser.deserialize({
version: 14,
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@ -13,10 +13,10 @@ export const parser = LRParser.deserialize({
],
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5
common/space_lua/parse.test.ts
View File

@ -81,4 +81,9 @@ Deno.test("Test Lua parser", () => {
parse(`a(1, 2, 3)`);
parse(`print "Sup"`);
parse(`e(1 + print "8")`);
// Return statements
parse(`return`);
parse(`return 1`);
parse(`return 1, 2, 3`);
});

4
common/space_lua/parse.ts
View File

@ -165,6 +165,10 @@ function parseStatement(n: CrudeAST): LuaStatement {
names: parseAttNames(t[2]),
expressions: t[4] ? parseExpList(t[4]) : [],
};
case "ReturnStatement": {
const expressions = t[2] ? parseExpList(t[2]) : [];
return { type: "Return", expressions };
}
case "break":
return { type: "Break" };
default:

33
common/space_lua/runtime.ts
View File

@ -1,6 +1,7 @@
import type { LuaFunctionBody } from "./ast.ts";
import { evalStatement } from "$common/space_lua/eval.ts";
export class LuaEnv implements ILuaSettable {
export class LuaEnv implements ILuaSettable, ILuaGettable {
variables = new Map<string, LuaValue>();
constructor(readonly parent?: LuaEnv) {
@ -18,7 +19,7 @@ export class LuaEnv implements ILuaSettable {
}
}
get(name: string): LuaValue {
get(name: string): LuaValue | undefined {
if (this.variables.has(name)) {
return this.variables.get(name);
}
@ -61,6 +62,10 @@ export interface ILuaSettable {
set(key: LuaValue, value: LuaValue): void;
}
export interface ILuaGettable {
get(key: LuaValue): LuaValue | undefined;
}
export class LuaFunction implements ILuaFunction {
constructor(private body: LuaFunctionBody, private closure: LuaEnv) {
}
@ -76,7 +81,19 @@ export class LuaFunction implements ILuaFunction {
}
env.set(this.body.parameters[i], arg);
}
throw new Error("Not yet implemented funciton call");
return evalStatement(this.body.block, env).catch((e: any) => {
if (e instanceof LuaReturn) {
if (e.values.length === 0) {
return;
} else if (e.values.length === 1) {
return e.values[0];
} else {
return new LuaMultiRes(e.values);
}
} else {
throw e;
}
});
}
}
@ -94,7 +111,7 @@ export class LuaNativeJSFunction implements ILuaFunction {
}
}
export class LuaTable implements ILuaSettable {
export class LuaTable implements ILuaSettable, ILuaGettable {
// To optimize the table implementation we use a combination of different data structures
// When tables are used as maps, the common case is that they are string keys, so we use a simple object for that
private stringKeys: Record<string, any>;
@ -131,7 +148,7 @@ export class LuaTable implements ILuaSettable {
}
}
get(key: LuaValue): LuaValue {
get(key: LuaValue): LuaValue | undefined {
if (typeof key === "string") {
return this.stringKeys[key];
} else if (Number.isInteger(key) && key >= 1) {
@ -202,6 +219,12 @@ export function luaLen(obj: any): number {
export class LuaBreak extends Error {
}
export class LuaReturn extends Error {
constructor(readonly values: LuaValue[]) {
super();
}
}
export function luaTruthy(value: any): boolean {
if (value === undefined || value === null || value === false) {
return false;