2023-04-28 17:57:35 -07:00

133 lines
3.3 KiB
TypeScript

// const STR = (s: string): StringValue => ({type: "string", value: s});
// const FN = (f: FunctionValue["value"]): FunctionValue => ({type: "function", value: f});
// const SYM = (s: string): SymbolValue => ({type: "symbol", value: s});
// const UNDEF = (): UndefinedValue => ({type: "undefined", value: null});
// const CODE = (p: CodeBlockValue["value"]): CodeBlockValue => ({type: "code", value: p});
// const THUNK = (t: ThunkValue["value"]): ThunkValue => ({type: "thunk", value: t});
// const BOOL = (b: boolean): BooleanValue => ({type: "boolean", value: b});
// console.log("HELLO");
// type SymbolValue = {
// type: "symbol",
// value: string,
// }
// type FunctionValue = {
// type: "function",
// value: (arg: Value, env: Environment, passalong: Passalong) => Result,
// }
// type StringValue = {
// type: "string",
// value: string,
// }
// type BooleanValue = {
// type: "boolean",
// value: boolean,
// }
// type UndefinedValue = {
// type: "undefined",
// value: null,
// }
// type CodeBlockValue = {
// type: "code",
// value: Array<Value>,
// }
// type ThunkValue = {
// type: "thunk",
// value: Array<Value>,
// }
// type Value =
// | SymbolValue
// | FunctionValue
// | StringValue
// | UndefinedValue
// | CodeBlockValue
// | ThunkValue
// | BooleanValue
// type Passalong = Value;
// type Result<V extends Value = Value> = {
// result: V,
// passalong: any,
// }
// type Environment = {[key: string]: Value}
// const evaluate_codeblock = (codeBlock: CodeBlockValue, env: Environment): Result => {
// let result: Result = {
// result: UNDEF(),
// passalong: UNDEF(),
// };
// const terms = [...codeBlock.value];
// while (terms.length) {
// console.log('evaluating phrase', terms);
// result = evaluate_phrase(terms, env, result.passalong);
// }
// return result;
// }
// const evaluate_phrase = (terms: Array<Value>, env: Environment, passalong: Passalong): Result => {
// let head: Result = evaluate_term(terms.shift() as Value, env, passalong);
// let pa = passalong;
// while (head.result.type === "function") {
// if (!terms.length) {
// throw 'Runtime Error: head function has no argument to be called with';
// }
// const tail: Result = evaluate_term(terms.shift() as Value, env, UNDEF());
// head = head.result.value(tail.result, env, pa);
// pa = head.passalong;
// }
// return head;
// }
// const evaluate_term = (term: Value, env: Environment, passalong: Passalong): Result => {
// if (term.type === "symbol") {
// return {
// result: env[term.value],
// passalong: UNDEF(), // TODO: this should include term.value as a "name"
// }
// } else if (term.type === "string") {
// return {
// result: term,
// passalong: UNDEF(),
// }
// } else if (term.type === "function") {
// return {
// result: term,
// passalong: UNDEF(),
// }
// } else if (term.type === "boolean") {
// return {
// result: term,
// passalong: UNDEF(),
// }
// }
// return {
// result: UNDEF(),
// passalong: UNDEF(),
// }
// }
// const my_env: Environment = {
// print: FN((arg, env, passalong) => {
// console.log(arg);
// return {
// result: UNDEF(),
// passalong: UNDEF(),
// }
// })
// }
// const my_prog: CodeBlockValue = CODE([
// SYM("print"), STR("hi"),
// ]);
// console.log(evaluate_codeblock(my_prog, my_env));