28:null 29:["$","title",null,{"children":"Objective-C Type Decoder | Jed Fox | Observable"}] 2e:T635,function parseFunc(input) { const eatOne = () => (input = input.slice(1)); const DIGITS = "0123456789"; const parseNum = () => { let num = ""; if (!DIGITS.includes(input[0])) { throw "Expected number" + (input ? `, got '${input}'` : ""); } while (input && DIGITS.includes(input[0])) { num += input[0]; eatOne(); } return num; }; let ret; [ret, input] = parseValue(input); if (requireAlignment) parseNum(); let args = []; while (input) { let arg; [arg, input] = parseValue(input); if (requireAlignment) parseNum(); args.push(arg); } if (type === "Method") { let labels = selector.split(":").slice(0, -1); if (args.length === 0) throw "Missing 'self' parameter"; if (args[0] !== "id") throw `Invalid 'self' type '${args[0]}'`; args.shift(); if (args.length === 0) throw "Missing '_cmd' parameter"; if (args[0] !== "SEL") throw `Invalid '_cmd' type '${args[0]}'`; args.shift(); if (!selector) { labels = Array(args.length) .fill() .map((_, i) => `arg${i + 1}`); } else if (labels.length !== args.length) { throw `Selector has ${labels.length} label${ labels.length === 1 ? "" : "s" } but the type specifies ${args.length} parameter${ args.length === 1 ? "" : "s" }`; } if (args.length === 0) { return `- (${ret})${selector || "someMethod"}`; } return `- (${ret})${args .map((arg, i) => `${labels[i]}:(${arg})`) .join(" ")}`; } else { return `(${args.join(", ")}) -> ${ret}`; } }2f:Tbfa,function parseValue(input) { const eatOne = () => (input = input.slice(1)); const DIGITS = "0123456789"; const parseNum = () => { let num = ""; if (!DIGITS.includes(input[0])) throw "Expected number"; while (input && DIGITS.includes(input[0])) { num += input[0]; eatOne(); } return num; }; const type = input[0]; eatOne(); switch (type) { case "c": return ["char", input]; case "i": return ["int", input]; case "s": return ["short", input]; case "l": return ["long", input]; case "q": return ["long long", input]; case "C": return ["unsigned char", input]; case "I": return ["unsigned int", input]; case "S": return ["unsigned short", input]; case "L": return ["unsigned long", input]; case "Q": return ["unsigned long long", input]; case "f": return ["float", input]; case "d": return ["double", input]; case "B": return ["bool", input]; case "v": return ["void", input]; case "*": return ["char *", input]; case "?": return ["?", input]; case "@": if (input[0] === '"') { eatOne(); const idx = input.indexOf('"'); if (idx === -1) throw `Unterminated string at '${input}'`; const type = input.slice(0, idx); input = input.slice(idx + 1); if (type[0] === "<") { return ["id" + type, input]; } else { return [type + " *", input]; } } return ["id", input]; case "#": return ["Class", input]; case ":": return ["SEL", input]; case "[": { let count; if (DIGITS.includes(input[0])) { count = parseNum(); } if (!input) throw "Expected type for array element"; const [element, rest] = parseValue(input); if (rest[0] != "]") throw `Unexpected character '${rest[0]}' after array element type`; return [element + (count != null ? `[${count}]` : "[]"), rest.slice(1)]; } case "{": { const props = []; let tag = ""; while (input && !"=}".includes(input[0])) { tag += input[0]; eatOne(); } if (input[0] === "=") { eatOne(); const types = []; while (input[0] !== "}") { if (!input) throw `Expected '}' or type, found end of string`; let type; [type, input] = parseValue(input); types.push(type); } return [`struct ${tag} { ${types.join(", ")} }`, eatOne()]; } else if (input[0] === "}") { eatOne(); return [`struct ${tag}`, input]; } } // case "(": /* TODO: handle union */ case "b": { return [`BitField<${parseNum()}>`, input]; } case "^": { if (!input) throw "Expected type for pointer value"; const [pointee, rest] = parseValue(input); return [pointee.endsWith("*") ? pointee + "*" : pointee + " *", rest]; } default: throw `Unexpected character '${type}'`; } }30:[] 2c:{"id":"f984dcdfa6c0251d","slug":"objc-type-decoder","title":"Objective-C Type Decoder","thumbnail":"f7be777dfeeecb93811e04830d61797b75a325b7085e983df332f183dc69ff40","access_level":"public","create_time":"$D2021-08-19T15:32:11.416Z","update_time":"$D2021-08-20T16:03:01.954Z","view_time":null,"first_public_time":"$D2021-08-20T13:42:05.996Z","has_unpublished_edits":null,"fork":false,"stars":0,"starred":false,"owner":{"type":"team","id":"d2030a8eee317bb7","login":"j-f1","name":"Jed Fox","avatar_url":"https://avatars-next.observableusercontent.com/d222a344a2bdf162a8495aa976e7c08179a554665edaa137ea155ef6bb38fc37","tier":"starter_2024"},"version":385,"publish_version":385,"role":null,"authored":false,"authors":[{"type":"individual","id":"6a6723dba070655c","login":"j-f1","name":"Jed Fox","avatar_url":"https://avatars-next.observableusercontent.com/d222a344a2bdf162a8495aa976e7c08179a554665edaa137ea155ef6bb38fc37","tier":null}],"members":[{"type":"individual","id":"6a6723dba070655c","login":"j-f1","name":"Jed Fox","avatar_url":"https://avatars-next.observableusercontent.com/d222a344a2bdf162a8495aa976e7c08179a554665edaa137ea155ef6bb38fc37","tier":null,"role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"lapsed":null,"subscribed":null,"forks":0,"collection":null,"type":"notebook","body":{"title":"Objective-C Type Decoder","cells":[{"id":0,"value":"# Objective-C Type Decoder\n\nDeveloped based on Apple’s [“Type Encodings” chapter](https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/ObjCRuntimeGuide/Articles/ocrtTypeEncodings.html) of the Objective-C Runtime Programming Guide.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":30,"value":"viewof type = Inputs.radio([\"Value\", \"Function\", \"Method\"], { value: \"Value\" })","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":6,"value":"html`

${viewof input}

${\n type === \"Value\"\n ? \"\"\n : html`

${Inputs.bind(\n Inputs.toggle({ label: \"Includes Alignment\" }),\n viewof requireAlignment\n )}`\n}${\n type === \"Method\"\n ? html`

${Inputs.bind(\n Inputs.text({\n label: html`Selector (optional)`,\n placeholder: \"Type or paste…\"\n }),\n viewof selector\n )}`\n : \"\"\n}`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":35,"value":"html`

${\n input\n ? html`${DOM.text(\n type === \"Value\"\n ? (() => {\n const [type, rest] = parseValue(input);\n if (rest !== \"\")\n throw `Unexpected character${\n rest.length === 1 ? \"\" : \"s\"\n } '${rest}' after type`;\n return type;\n })()\n : parseFunc(input)\n )}`\n : html`Enter a type above…`\n}`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":151,"value":"$2e","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":18,"value":"$2f","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":25,"value":"test(parseValue, {\n Basic: [\n [\"c\", \"char\"],\n [\"i\", \"int\"],\n [\"C\", \"unsigned char\"],\n [\"b12\", \"BitField<12>\"]\n ],\n Arrays: [\n [\"[f]\", \"float[]\"],\n [\"[[I]]\", \"unsigned int[][]\"],\n [\"[12^f]\", \"float *[12]\"]\n ],\n Structs: [\n [\"{example}\", \"struct example\"],\n [\"{example=@*i}\", \"struct example { id, char *, int }\"],\n [\"^{example=@*i}\", \"struct example { id, char *, int } *\"],\n [\"{NSObject=#}\", \"struct NSObject { Class }\"]\n ],\n Objects: [\n ['@\"UIView\"', \"UIView *\"],\n ['@\"\"', \"id\"]\n ]\n})","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":49,"value":"test = (fn, tests) => {\n const { list, run } = defaultTestRunner(\n Object.fromEntries(\n Object.entries(tests).map(([name, tests]) => [\n name,\n (assert) =>\n tests.forEach(([input, output]) => {\n const actual = fn(input);\n assert(\n actual[0] === output && actual[1] === \"\",\n `${fn(input)[0]} ≠ ${output}`\n );\n })\n ])\n )\n );\n run();\n return list;\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":312,"value":"viewof input = Inputs.text({\n label: \"Encoded Type\",\n placeholder: \"Type or paste…\"\n})","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":276,"value":"viewof selector = Inputs.input(\"\")","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":335,"value":"viewof requireAlignment = Inputs.input(true)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":260,"value":"","pinned":true,"hidden":false,"mode":"html","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":47,"value":"import { defaultTestRunner } from \"@mootari/signature@547\"","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"}],"files":"$W30","stdlib":"1","titling":"auto"}} 2d:"$2c:body"