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import { getById, h, writeError } from "/common.module.js"; |
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import lzString from "/lz-string.module.js"; |
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|
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let definitions = {}; |
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|
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const form = getById("form"); |
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const input = getById("input"); |
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const log = getById("log"); |
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|
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form.onsubmit = async (event) => { |
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event.preventDefault(); |
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await submitForm(); |
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}; |
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|
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const urlParams = new URLSearchParams(window.location.search); |
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const queryInput = urlParams.get("in"); |
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|
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if (input.value.length === 0) { |
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input.value = lzString.decompressFromEncodedURIComponent(queryInput); |
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} |
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|
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async function submitForm() { |
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console.log(input.value); |
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resetLog(); |
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try { |
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definitions = {}; |
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const stack = await evalString(input.value); |
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console.log(stack); |
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|
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const path = window.location.pathname; |
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const params = new URLSearchParams(window.location.search); |
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const hash = window.location.hash; |
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|
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params.set("in", lzString.compressToEncodedURIComponent(input.value)); |
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window.history.replaceState( |
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{}, |
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"", |
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`${path}?${params.toString()}${hash}`, |
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); |
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} catch (error) { |
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writeError(error); |
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console.log(error); |
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} |
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} |
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|
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function splitWords(input) { |
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return input |
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.trim() |
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.split(/\s+/) |
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.filter((i) => i); |
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} |
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|
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|
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function evalString(inputString) { |
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let words = splitWords(inputString); |
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return evalWords(words); |
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} |
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|
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function effect2(f) { |
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return (stack) => { |
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if (stack.length <= 1) throw "stack underflow, need 2 numbers"; |
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let [x, y, ...rest] = stack; |
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return [f(y, x), ...rest]; |
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}; |
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} |
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|
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const plus = effect2((a, b) => a + b); |
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const subtract = effect2((a, b) => a - b); |
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const multiply = effect2((a, b) => a * b); |
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const divide = effect2((a, b) => a / b); |
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|
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async function evalWords(inputWords) { |
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let words = inputWords; |
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let stack = []; |
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|
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while (words.length > 0) { |
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await writeLog(stack, words); |
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if (words.length === 0) return stack; |
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|
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let [word, ...rest] = words; |
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[stack, words] = evalWord(word, stack, rest); |
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|
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await new Promise((r) => setTimeout(r, 100)); |
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} |
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await writeLog(stack, words); |
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return stack; |
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} |
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|
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function evalWord(word, stack, rest) { |
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switch (word) { |
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case "+": |
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return [plus(stack), rest]; |
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case "-": |
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return [subtract(stack), rest]; |
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case "*": |
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return [multiply(stack), rest]; |
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case "/": |
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return [divide(stack), rest]; |
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case "dup": |
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return [dup(stack), rest]; |
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case "drop": |
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return [drop(stack), rest]; |
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case "swap": |
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return [swap(stack), rest]; |
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case "skip": |
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return skip(stack, rest); |
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case ",,": |
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return unquote(stack, rest); |
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case ":": |
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return [stack, define(rest)]; |
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default: |
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return parse(word, stack, rest); |
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} |
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} |
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|
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function unquote(stack, rest) { |
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let [quote, ...restStack] = stack; |
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if (typeof quote === "string" || quote instanceof String) { |
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return [restStack, [...splitWords(quote), ...rest]]; |
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} else { |
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throw "not a string, only strings are unquoteable"; |
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} |
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} |
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|
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function skip(stack, words) { |
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if (stack.length === 0) throw "stack underflow, dont know how much to skip"; |
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let [amount, ...restStack] = stack; |
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|
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if (amount > words.length) |
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throw `program underflow, cant skip ${amount} words`; |
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if (amount <= 0) return [stack.slice(1), words]; |
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|
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let restWords = words.slice(amount); |
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|
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return [restStack, restWords]; |
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} |
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|
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function define(words) { |
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if (words.length < 2) throw "missing definition after ':'"; |
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let [ident, ...rest] = words; |
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let index = 0; |
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let definition = []; |
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|
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for (; index < rest.length; index++) { |
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const word = rest[index]; |
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if (word === ";") { |
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break; |
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} else if (rest.length - 1 === index) { |
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throw "expected ';', found end of program"; |
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} |
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definition.push(word); |
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} |
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|
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definitions[ident] = definition; |
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|
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return rest.slice(index + 1); |
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} |
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|
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function dup(stack) { |
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if (stack.length === 0) throw "stack underflow, nothing to duplicate"; |
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let [x, ...rest] = stack; |
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return [x, x, ...rest]; |
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} |
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|
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function drop(stack) { |
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if (stack.length === 0) throw "stack underflow, nothing to drop"; |
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let [_, ...rest] = stack; |
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return rest; |
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} |
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|
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function swap(stack) { |
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if (stack.length < 2) throw "stack underflow, not enough to swap"; |
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let [x, y, ...rest] = stack; |
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return [y, x, ...rest]; |
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} |
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|
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function parse(word, stack, rest) { |
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if (word.startsWith('"')) { |
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return parseString(word, stack, rest); |
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} |
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|
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if (word in definitions) { |
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return [stack, [...definitions[word], ...rest]]; |
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} |
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|
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let num = Number(word); |
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if (isNaN(num)) { |
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throw `word '${word}' not recognised`; |
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} |
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|
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return [[num, ...stack], rest]; |
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} |
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|
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function parseString(word, stack, rest) { |
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if (word.length > 1 && word.endsWith('"')) { |
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return [[word.slice(1, -1), ...stack], rest]; |
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} |
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|
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let string = word.slice(1); |
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let index = 0; |
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|
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for (; index < rest.length; index++) { |
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const word = rest[index]; |
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if (word.endsWith('"')) { |
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string = string.concat(" ", word.slice(0, -1)); |
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break; |
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} else if (rest.length - 1 === index) { |
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throw "expected word ending with '\"', found end of program"; |
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} |
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string = string.concat(" ", word); |
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} |
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|
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return [[string, ...stack], rest.slice(index + 1)]; |
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} |
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|
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function writeLog(stack, words) { |
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return new Promise((resolve, _reject) => { |
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let log_left = h("span", `[${stack.join(", ")}]`); |
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let log_right = h("span", words.join(" ")); |
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|
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if (words.length === 0) { |
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log_left.textContent += " <=="; |
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} |
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|
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let log_row = h("div", {class: "flex-spread"}, [log_left, log_right]); |
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|
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log.appendChild(log_row); |
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resolve(); |
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}); |
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} |
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|
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function resetLog() { |
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if (!log.hasChildNodes()) return; |
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|
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let summary = h("summary", log.firstChild.lastChild.textContent); |
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|
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let old_log = log.cloneNode(true); |
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old_log.id = ""; |
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|
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let details = h("details", {class: "history"}, [summary, old_log]); |
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|
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log.insertAdjacentElement("afterend", details); |
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log.replaceChildren(); |
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} |