mirror of https://github.com/Baidicoot/rpncalc-v4
testing new engine
This commit is contained in:
Aidan K. Ewart
parent
f6e5f70d03
commit
5f7a6f0516
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@ -1,3 +1,9 @@
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aidan-network.duckdns.org {
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root ./old/
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file_server
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}
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localhost:8443 {
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root ./new/
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file_server
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}
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@ -0,0 +1,107 @@
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import {addDefn, addRPNASTDefn, makeFn, cloneElem} from './shiny.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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console.log(args[0], args[1])
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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 tuple = (_, args) => {
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return [makeFn(args[0], (_, args) => {return [{type:"tuple", 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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const coerce = (_, args) => {
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if (args[0].type === "type") {
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let o = cloneElem(args[1]);
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o.type = args[0].val;
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return o;
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} else {
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throw 'typeerror'
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}
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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("tuple", ["int"], tuple);
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addDefn("!!", ["int", "tuple"], index);
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addDefn("len", ["tuple"], len);
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addDefn("unsafeCoerce", 2, coerce);
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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 ==)");
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@ -0,0 +1,6 @@
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<html>
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<textarea type="text" id="inbox"></textarea>
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<button id="submit">execute</button>
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<pre id="outbox"></pre>
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<script src="./main.js" type="module"></script>
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</html>
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@ -0,0 +1,58 @@
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import {execRPN} from './shiny.mjs';
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import {parseExprs} from './parse.mjs';
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import {tokenize} from './token.mjs';
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//import './builtin.mjs';
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const inbox = document.getElementById("inbox")
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const outbox = document.getElementById("outbox")
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const submit = document.getElementById("submit")
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const show = (elem) => {
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if (elem.type === "int") {
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return elem.val
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} else if (elem.type === "pair") {
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return "{" + show(elem.val.fst) + ", " + show(elem.val.snd) + "}"
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} else if (elem.type === "closure") {
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return "(needs: " + elem.val.args.join(", ") + ")"
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} else if (elem.type === "type") {
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return elem.val
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} else if (elem.type === "array") {
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return "[" + prettyprint(elem.val) + "]"
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} else if (elem.val) {
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return "(" + elem.type + ": " + elem.val + ")"
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} else {
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return elem.type
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}
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}
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const prettyprint = (out) => {
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let str = "";
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for (let i = 0; i < out.length; i++) {
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str += show(out[i]);
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if (i < out.length - 1) {
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str += " ";
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}
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}
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return str;
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}
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submit.onclick = (event) => {
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const input = inbox.value;
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let toks = tokenize(input);
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if (!toks) {
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outbox.innerHTML = "could not parse input: " + input;
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return;
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}
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let ast = parseExprs(toks);
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if (!ast.parsed) {
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outbox.innerHTML = "incorrect syntax somewhere";
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return;
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}
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let out = execRPN({}, ast.parsed);
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if (!out) {
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outbox.innerHTML = "failed to execute";
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return;
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}
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//console.log(out.stacks);
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outbox.innerHTML = prettyprint(out.stacks[0]);
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}
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@ -0,0 +1,145 @@
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/*
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EVAL.js
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-------
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reads exprs from AST and executes them
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types of elem:
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all have type
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all have val
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TYPE VAL
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"closure" {scope:{}, args:['x', 'y'], defn:<function-like>}
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<function-like>:
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{type:"ins", ins:[]}
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{type:"builtin", fn:(scope) => {stack}}
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exported functionality:
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defnOp(name, function) - define a built-in operator
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evalRPN(scope, ast)
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*/
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let builtins = {};
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export const defnOp = (name, data) => {
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builtins[name] = data;
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}
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const lookup = (name, scope) => {
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let n = scope[name];
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if (n) {
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return n;
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}
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n = builtins[n];
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if (n) {
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return n;
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}
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console.log(scope);
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throw '"' + name + '" not in scope'
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}
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const extend = (scope, name, elems) => {
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let o = Object.create(scope);
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o[name] = elems;
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return o;
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}
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const runFn = (defn, state) => {
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if (defn.type === "ins") {
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state.calls.push(defn.ins);
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state.stacks.push([]);
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} else if (defn.type === "builtin") {
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let scope = state.scopes.pop();
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let out = defn.fn(scope);
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state.calls.push([]);
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state.stacks.push(out);
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}
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}
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const giveArg = (arg, elem) => {
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let argN = elem.val.args[elem.val.args.length-1];
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let newscope = extend(elem.val.scope, argN, [arg]);
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return {type:elem.type, val:{scope:newscope, args:elem.val.args.slice(0,-1), defn:elem.val.defn}};
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}
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const apply = (elem, state) => {
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if (elem.type === "closure") {
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if (elem.val.args.length === 0) {
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state.scopes.push(elem.val.scope);
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runFn(elem.val.defn, state);
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} else if (state.stacks[state.stacks.length-1].length > 0) {
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apply(giveArg(state.stacks[state.stacks.length-1].pop(), elem), state);
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} else {
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state.stacks[state.stacks.length-1].push(elem);
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}
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} else {
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state.stacks[state.stacks.length-1].push(elem);
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}
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}
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const applyMany = (elems, state) => {
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for (let i = 0; i < elems.length; i++) {
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apply(elems[i], state);
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}
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}
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const makeStackElems = (ins, state) => {
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if (ins.type === "push") {
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throw 'nested push error'
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} else if (ins.type === "ident") {
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return lookup(ins.val, state.scopes[state.scopes.length-1]);
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} else if (ins.type === "func") {
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return [{type:"closure", val:{scope:state.scopes[state.scopes.length-1], args:ins.args, defn:{type:"ins", ins:ins.body}}}];
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} else {
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return [ins];
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}
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}
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const doIns = (ins, state) => {
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if (ins.type === "push") {
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state.stacks[state.stacks.length-1] = state.stacks[state.stacks.length-1].concat(makeStackElems(ins.elem, state));
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} else if (ins.type === "defn") {
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// initialize definition scope
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let defscope = Object.create(state.scopes[state.scopes.length-1]);
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// parse into closure for definition's scope (to allow for recursion)
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let fnForm = {type:"closure", val:{scope:defscope, args:[], defn:{type:"ins", ins:ins.defn}}};
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// add fnForm to definition scope
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defscope[ins.ident] = [fnForm];
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// evaluate fnForm
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let out = execRPN(defscope, ins.defn);
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defscope[ins.ident] = out.stacks[0];
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state.scopes[state.scopes.length-1] = defscope;
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} else {
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applyMany(makeStackElems(ins, state), state);
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}
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}
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const step = (state) => {
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if (state.calls[state.calls.length-1].length === 0) {
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if (state.calls.length === 1) {
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throw 'finished execution'
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}
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if (state.stacks.length < 2) {
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throw 'nothing to return'
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}
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state.calls.pop();
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let out = state.stacks.pop();
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applyMany(out, state);
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} else {
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let ins = state.calls[state.calls.length-1][0];
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state.calls[state.calls.length-1] = state.calls[state.calls.length-1].slice(1);
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doIns(ins, state);
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}
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}
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export const execRPN = (scope, ins) => {
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let state = {scopes:[scope], stacks:[[]], calls:[ins]};
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while (state.calls[0].length > 0 || state.calls.length > 1) {
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step(state);
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if (state.stacks.length > 4096) {
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throw 'max recursion depth exceeded'
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}
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}
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return state;
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}
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@ -1,4 +1,4 @@
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import {addDefn, addRPNASTDefn, makeFn} from './eval.mjs';
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import {addDefn, addRPNASTDefn, makeFn, cloneElem} 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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@ -60,7 +60,7 @@ const eq = (_, args) => {
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}
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const tuple = (_, args) => {
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return [makeFn(args[0], (_, args) => {return [{type:"array", val:args}]})];
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return [makeFn(args[0], (_, args) => {return [{type:"tuple", val:args}]})];
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}
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const index = (_, args) => {
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@ -73,7 +73,9 @@ const len = (_, args) => {
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const coerce = (_, args) => {
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if (args[0].type === "type") {
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return [{type:args[0].val, val:args[1].val}];
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let o = cloneElem(args[1]);
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o.type = args[0].val;
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return o;
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} else {
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throw 'typeerror'
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}
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@ -91,15 +93,15 @@ 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("tuple", ["int"], tuple);
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addDefn("!!", ["int", "array"], index);
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addDefn("len", ["array"], len);
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addDefn("!!", ["int", "tuple"], index);
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addDefn("len", ["tuple"], len);
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addDefn("unsafeCoerce", 2, coerce);
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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("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 ==)");
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addRPNDefn("fold", "(x acc fn -> acc '(-> x acc fn 'fn fold) 'x \"stop ==)");
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@ -72,7 +72,7 @@ const makeObj = (elem) => {
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}
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}
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const cloneElem = (elem) => {
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export const cloneElem = (elem) => {
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if (Array.isArray(elem)) {
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return elem.map(cloneElem);
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} if (elem.type === "closure") {
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@ -81,6 +81,8 @@ const cloneElem = (elem) => {
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argsClone.push(cloneElem(elem.args[i]));
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}
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return {type:"closure", args:argsClone, func:elem.func};
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} else if (elem.val) {
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return {type:elem.type, val:elem.val};
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} else {
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return elem;
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}
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@ -148,7 +150,6 @@ const pushS = (elem, stack) => {
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} else {
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if (elem.type === "ident") {
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let id = lookupScope(elem.val, stack.scope);
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console.log(id);
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pushS(id, stack);
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} else {
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stack.stack.push(elem);
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|
|
@ -176,10 +177,15 @@ const showIns = (curr) => {
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return curr.val;
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} else if (curr.type === "push") {
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return "'" + showIns(curr.elem)
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} else if (curr.type === "func") {
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return "anon"
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} else if (curr.type === "defn") {
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return curr.ident;
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}
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}
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export const execRPN = (scope, i) => {
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console.log(scope);
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let ins = JSON.parse(JSON.stringify(i));
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let stack = {scope:scope, stack:[]};
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while (ins.length > 0) {
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@ -18,6 +18,10 @@ const show = (elem) => {
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return elem.val
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} else if (elem.type === "array") {
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return "[" + prettyprint(elem.val) + "]"
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} else if (elem.val) {
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return "(" + elem.type + ": " + elem.val + ")"
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} else {
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return elem.type
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}
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}
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|
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@ -0,0 +1,212 @@
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/*
|
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parse.js
|
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--------
|
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|
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Parse tokenstream into AST
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|
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convert:
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[
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{type:"int",val:1},
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{type:"int",val:2},
|
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{type:"ident",name:"+"},
|
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{type:"syntax",val:"'"},
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{type:"syntax",val:"("},
|
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{type:"ident",name:"name"},
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{type:"syntax",val:";"},
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{type:"ident",name:"args"},
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{type:"syntax",val:"->"},
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{type:"int",val:2},
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{type:"ident",name:"args"},
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{type:"ident",name:"+"},
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{type:"syntax",val:")"}
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]
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(for c+p)
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[{type:"int",val:1},{type:"int",val:2},{type:"ident",name:"+"},{type:"syntax",val:"'"},{type:"syntax",val:"("},{type:"ident",name:"name"},{type:"ident",name:"args"},{type:"syntax",val:"->"},{type:"int",val:2},{type:"ident",name:"args"},{type:"ident",name:"+"},{type:"syntax",val:")"}]
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to:
|
||||
[
|
||||
{type:"int", val:1},
|
||||
{type:"int", val:2},
|
||||
{type:"builtin", op:"+"},
|
||||
{type:"push", elem:
|
||||
{type:"func", args:["args"], body:[
|
||||
{type:"int", val:1},
|
||||
{type:"ident", val:"args"},
|
||||
{type:"builtin", op:"+"},
|
||||
}}]}}
|
||||
]
|
||||
|
||||
EXPORTED FUNCTIONS:
|
||||
parseExprs - takes in tokenstream, outputs AST
|
||||
*/
|
||||
|
||||
/* make parser safe */
|
||||
const attempt = (parser) => (stream) => {
|
||||
let streamclone = [...stream];
|
||||
try {
|
||||
let out = parser(stream);
|
||||
return out;
|
||||
} catch(err) {
|
||||
return {parsed:null,stream:streamclone};
|
||||
}
|
||||
}
|
||||
|
||||
/* chain */
|
||||
const or = (a, b) => (stream) => {
|
||||
let aout = a(stream);
|
||||
if (aout.parsed === null) {
|
||||
return b(aout.stream);
|
||||
} else {
|
||||
return aout;
|
||||
}
|
||||
}
|
||||
|
||||
/* (parser) */
|
||||
const parens = (parser) => (stream) => {
|
||||
let a = parseSyntax("(")(stream);
|
||||
if (a.parsed === null) {
|
||||
return {parsed:null, stream:a.stream};
|
||||
}
|
||||
let dat = parser(a.stream);
|
||||
a = parseSyntax(")")(dat.stream);
|
||||
if (a.parsed === null) {
|
||||
throw 'mismatched parens!';
|
||||
}
|
||||
return {parsed:dat.parsed, stream:a.stream};
|
||||
}
|
||||
|
||||
/* [parser] */
|
||||
const many = (parser) => (stream) => {
|
||||
let parsed = [];
|
||||
for (let i = parser(stream); i.parsed !== null; i = parser(stream)) {
|
||||
parsed.push(i.parsed);
|
||||
stream = i.stream;
|
||||
}
|
||||
return {parsed:parsed, stream:stream};
|
||||
}
|
||||
|
||||
/* takes in stream, outputs parsed item or null */
|
||||
const parseIdent = (stream) => {
|
||||
let e = stream[0];
|
||||
if (e === undefined) {
|
||||
return {parsed:null, stream:stream};
|
||||
}
|
||||
if (e.type !== "ident") {
|
||||
return {parsed:null, stream:stream};
|
||||
} else {
|
||||
stream.shift();
|
||||
return {parsed:{type:e.type, val:e.name}, stream:stream};
|
||||
}
|
||||
}
|
||||
|
||||
/* takes in stream, outputs parsed item or null */
|
||||
const parseInteger = (stream) => {
|
||||
let e = stream[0];
|
||||
if (e === undefined) {
|
||||
return {parsed:null, stream:stream};
|
||||
}
|
||||
if (e.type !== "int") {
|
||||
return {parsed:null, stream:stream};
|
||||
} else {
|
||||
stream.shift();
|
||||
return {parsed:{type:e.type, val:e.val}, stream:stream};
|
||||
}
|
||||
}
|
||||
|
||||
/* takes in stream, outputs parsed item or null */
|
||||
const parseSyntax = (syntax) => (stream) => {
|
||||
let e = stream[0];
|
||||
if (e === undefined) {
|
||||
return {parsed:null, stream:stream};
|
||||
}
|
||||
if (e.type !== "syntax") {
|
||||
return {parsed:null, stream:stream};
|
||||
}
|
||||
if (e.val !== syntax) {
|
||||
return {parsed:null, stream:stream};
|
||||
} else {
|
||||
stream.shift();
|
||||
return {parsed:{type:"syntax", val:syntax}, stream:stream};
|
||||
}
|
||||
}
|
||||
|
||||
/* takes in stream, outputs string or null - FAILABLE */
|
||||
const parseName = (stream) => {
|
||||
let id = parseIdent(stream);
|
||||
if (id.parsed === null) {
|
||||
return {parsed:null, stream:id.stream};
|
||||
}
|
||||
let syn = parseSyntax(";")(id.stream);
|
||||
if (syn.parsed === null) {
|
||||
throw 'could not parse name!'
|
||||
}
|
||||
return {parsed:id.parsed.val, stream:syn.stream};
|
||||
}
|
||||
|
||||
const parseType = (stream) => {
|
||||
let syn = attempt(parseSyntax("\""))(stream);
|
||||
if (syn.parsed === null) {
|
||||
return {parsed:null, stream:syn.stream};
|
||||
}
|
||||
let id = or(parseIdent, parseInteger)(syn.stream);
|
||||
if (id.parsed === null) {
|
||||
return {parsed:null, stream:id.stream};
|
||||
}
|
||||
return {parsed:{type:"type", val:id.parsed.val}, stream:id.stream};
|
||||
|
||||
//return {parsed:null, stream:stream};
|
||||
}
|
||||
|
||||
/* takes in stream, outputs parsed item or null - FAILABLE */
|
||||
const parsePush = (stream) => {
|
||||
let syn = attempt(parseSyntax("'"))(stream);
|
||||
if (syn.parsed === null) {
|
||||
return {parsed:null, stream:syn.stream};
|
||||
}
|
||||
let id = parseExpr(syn.stream);
|
||||
if (id.parsed === null) {
|
||||
return {parsed:null, stream:id.stream};
|
||||
}
|
||||
return {parsed:{type:"push", elem:id.parsed}, stream:id.stream};
|
||||
}
|
||||
|
||||
const parseDefn = (stream) => {
|
||||
let name = parseName(stream);
|
||||
if (name.parsed === null) {
|
||||
throw 'no name found!'
|
||||
}
|
||||
let expr = parseExprs(stream);
|
||||
if (expr.parsed === null) {
|
||||
throw 'no body found!'
|
||||
}
|
||||
return {parsed:{type:"defn", ident:name.parsed, defn:expr.parsed}, stream:expr.stream}
|
||||
}
|
||||
|
||||
/* takes in stream, outputs parsed item or null - FAILABLE */
|
||||
const parseLambda = (stream) => {
|
||||
let args = many(parseIdent)(stream);
|
||||
let syn = parseSyntax("->")(args.stream);
|
||||
if (syn.parsed === null) {
|
||||
throw 'no lambda body found!';
|
||||
}
|
||||
let body = parseExprs(syn.stream); // .parsed should never be null, but anyway...
|
||||
if (body.parsed === null) {
|
||||
throw 'no lambda body found!';
|
||||
}
|
||||
return {parsed:{type:"func", args:args.parsed.map(x => x.val), body:body.parsed}, stream:body.stream};
|
||||
}
|
||||
|
||||
/* takes in stream, outputs parsed item or null */
|
||||
const parseExpr = or(
|
||||
attempt(parens(parseDefn)), or(
|
||||
attempt(parens(parseLambda)), or(
|
||||
attempt(parseLambda), or(
|
||||
parseType, or(
|
||||
parseIdent, or(
|
||||
parseInteger,
|
||||
parsePush
|
||||
))))));
|
||||
|
||||
/* takes in stream, outputs parsed items */
|
||||
export const parseExprs = many(parseExpr);
|
||||
|
|
@ -0,0 +1,51 @@
|
|||
export function tokenize(input) {
|
||||
let i;
|
||||
let inputWithAddedSpaces = "";
|
||||
const syntax = /['";()]/; // -> is a special syntax (because it uses 2 characters) so is coded separately
|
||||
for(i = 0; i<input.length; i++){
|
||||
if(syntax.test(input.charAt(i))){
|
||||
if(input.charAt(i-1) != " "){
|
||||
inputWithAddedSpaces += " "; // adds a space
|
||||
}
|
||||
if(input.charAt(i+1) != " "){
|
||||
inputWithAddedSpaces += input.charAt(i) + " "; // adds a space after the character
|
||||
} else {
|
||||
inputWithAddedSpaces += input.charAt(i); // adds the character
|
||||
}
|
||||
} else if(input.charAt(i) === "-" && input.charAt(i+1) === ">"){
|
||||
if(input.charAt(i-1) != " "){
|
||||
inputWithAddedSpaces += " "; // adds a space
|
||||
}
|
||||
if(input.charAt(i+2) != " "){
|
||||
inputWithAddedSpaces += "->" + " "; // adds a space after the two characters
|
||||
} else {
|
||||
inputWithAddedSpaces += "->"; // adds the two characters
|
||||
}
|
||||
} else if(input.charAt(i) != ">") { // if it is syntax, it was already detected at "-"
|
||||
inputWithAddedSpaces += input.charAt(i);
|
||||
}
|
||||
} // i feel like this for loop is inefficient and could just add spaces around syntax all the time, so the following code has more writes to memory but may be more efficient. replace lines 5-27 with 29-37 by commenting out lines 5-27 and removing the /* and */ around lines 29-37. Note: i have not tested the code but it probably works.
|
||||
/*
|
||||
for(i = 0; i<input.length; i++){
|
||||
if(syntax.test(input.charAt(i))){
|
||||
inputWithAddedSpaces += " " + input.charAt(i) + " ";
|
||||
} else if(input.charAt(i) === "-" && input.charAt(i+1) === ">"){
|
||||
inputWithAddedSpaces += " -> ";
|
||||
} else {
|
||||
inputWithAddedSpaces += input.charAt(i);
|
||||
}
|
||||
}
|
||||
*/
|
||||
let splitInput = inputWithAddedSpaces.split(" ").filter((s) => s !== "");
|
||||
let output = [];
|
||||
for(i = 0; i<splitInput.length; i++){
|
||||
if(!isNaN(splitInput[i])){ // didn't need /[0-9]/, but that would be helpful to stop numbers from being in identifiers, but the ability to call a function "function_add_1" is easier to type than "function_add_one"
|
||||
output.push({type: "int", val:Number(splitInput[i])}); // also, /[a-zA-Z]/ wasn't necessary as my code uses anything that isn't `;() or ->
|
||||
} else if(syntax.test(splitInput[i]) || splitInput[i] === "->"){// needs a || as -> wasn't included in the syntax regexp. it wasn't in because -> uses two characters so i wanted to have separate code for it. (also because regexps are confusing)
|
||||
output.push({type: "syntax", val:splitInput[i]});
|
||||
} else if(splitInput[i] != '') { // if syntax is next to the end of the string or other bits of syntax the two spaces are in inputWithAddedSpaces so .split returns '' as one element. this makes sure that it is not read as an identifier
|
||||
output.push({type: "ident", name:splitInput[i]});
|
||||
}
|
||||
}
|
||||
return(output)
|
||||
}
|
||||
Loading…
Reference in New Issue