mirror of https://github.com/Baidicoot/rpncalc-v4
95 lines
2.4 KiB
JavaScript
95 lines
2.4 KiB
JavaScript
import {addDefn, addRPNASTDefn, makeFn} from './eval.mjs';
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import {parseExprs} from './parse.mjs';
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import {tokenize} from './token.mjs';
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const addRPNDefn = (name, def) => {
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let toks = tokenize(def);
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if (!toks) {
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throw 'could not load builtin'
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}
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let ast = parseExprs(toks);
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if (!ast.parsed) {
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throw 'could not load builtin'
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}
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addRPNASTDefn(name, ast.parsed[0]);
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}
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const add = (_, args) => {
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return [{type:"int", val:args[0] + args[1]}];
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}
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const sub = (_, args) => {
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return [{type:"int", val:args[1] - args[0]}];
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}
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const div = (_, args) => {
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return [{type:"int", val:args[1] / args[0]}];
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}
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const mult = (_, args) => {
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return [{type:"int", val:args[0] * args[1]}];
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}
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const pow = (_, args) => {
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return [{type:"int", val:Math.pow(args[1], args[0])}];
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}
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const root = (_, args) => {
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return [{type:"int", val:Math.sqrt(args[0])}];
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}
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const type = (_, args) => {
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return [{type:"type", val:args[0].type}];
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}
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const pair = (_, args) => {
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return [{type:"pair", val:{fst:args[1], snd:args[0]}}];
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}
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const fst = (_, args) => [args[0].fst];
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const snd = (_, args) => [args[0].snd];
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const eq = (_, args) => {
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if (args[0].type === args[1].type && args[0].val === args[1].val) {
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return [{type:"ident", val:"true"}];
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} else {
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return [{type:"ident", val:"false"}];
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}
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}
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const arr = (_, args) => {
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return [makeFn(args[0], (_, args) => {return [{type:"array", val:args}]})];
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}
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const index = (_, args) => {
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return [args[1][args[0]]];
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}
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const len = (_, args) => {
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return [{type:"int", val:args[0].length}];
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}
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addDefn("+", ["int", "int"], add);
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addDefn("-", ["int", "int"], sub);
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addDefn("/", ["int", "int"], div);
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addDefn("*", ["int", "int"], mult);
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addDefn("^", ["int", "int"], pow);
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addDefn("sqrt", ["int"], root);
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addDefn("==", 2, eq);
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addDefn("typeof", 1, type);
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addDefn("pair", 2, pair);
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addDefn("fst", ["pair"], fst);
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addDefn("snd", ["pair"], snd);
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addDefn("arr", ["int"], arr);
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addDefn("!!", ["int", "array"], index);
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addDefn("len", ["array"], len);
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//addRPNDefn("unit", "(-> 0 arr)");
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//addRPNDefn("mono", "(-> 1 arr)");
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//addRPNDefn("unwrap", "(-> 0 !!)");
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addRPNDefn("true", "(a b -> a)");
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addRPNDefn("false", "(a b -> b)");
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addRPNDefn("stop", "(-> \"stop)");
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//addRPNDefn("id", "(a -> a)");
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addRPNDefn("inv", "(x -> 1 x /)");
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addRPNDefn("fold", "(x acc fn -> '(-> acc) '(-> x acc fn 'fn fold) 'x \"stop ==)"); |