🧮 Math Expression Solver

\n \n \n

Try: 2 + 3 * 4 · (10 - 4) / 3 · 2^8 · sqrt(16) + 5

\n \n \n`;\n\nexport default function handler(req: Request): Response {\n const url = new URL(req.url);\n\n // ?expr=... returns JSON instead of HTML\n if (url.searchParams.has(\"expr\")) {\n const expr = url.searchParams.get(\"expr\")!;\n try {\n return Response.json({ expr, result: solveExpression(expr) });\n } catch {\n return Response.json({ expr, error: \"Could not parse expression\" }, {\n status: 400,\n });\n }\n }\n\n return new Response(PAGE, {\n headers: { \"content-type\": \"text/html; charset=utf-8\" },\n });\n}\n","label",[140],"ffd23dc0-30e4-408e-9500-64ede8aa80e4","probe.ts","0cb23038-9c44-11f1-bee4-1607ee4eb77e",3,["D",1787195150983],"script","import { fetch_val_endpoint } from \"https://esm.town/v/std/http\";\n\nconst res = await fetch_val_endpoint(\"samuelfiais/math-expression-solver\", \"/main.ts\");\nconsole.log(\"plain\", res.status, (await res.text()).slice(0, 100));\n",[151],"168bf7d0-322f-406b-9636-c4fa4d47e657","main.ts",8,["D",1787195321120],1,"// O endpoint real do projeto está em solver.ts.\n// Este arquivo apenas repassa para ele, então qualquer acesso ao main funciona.\nexport { default } from \"./solver.ts\";\n",[159],"54d7f2d5-d2de-4c9a-b183-80432a3a1a19","index.ts","18daf1c4-9c44-11f1-9560-1607ee4eb77e",["D",1787195171383],"// A simple math expression solver with a live web page.\n// Try: 2 + 3 * 4, (10 - 4) / 3, 2^8, or sqrt(16) + 5\nimport { serveFile } from \"https://esm.town/v/std/utils/index.ts\";\n\n// Evaluate an expression safely using our own tiny parser.\nfunction solveExpression(expr: string): number {\n const tokens = expr\n .replace(/\\s+/g, \"\")\n .split(/([()+\\-*/^])/)\n .filter((t) => t !== \"\");\n\n let pos = 0;\n const peek = () => tokens[pos];\n const next = () => tokens[pos++];\n\n function parseExpr(): number {\n let value = parseTerm();\n while (peek() === \"+\" || peek() === \"-\") {\n const op = next();\n const rhs = parseTerm();\n value = op === \"+\" ? value + rhs : value - rhs;\n }\n return value;\n }\n\n function parseTerm(): number {\n let value = parsePower();\n while (peek() === \"*\" || peek() === \"/\") {\n const op = next();\n const rhs = parsePower();\n value = op === \"*\" ? value * rhs : value / rhs;\n }\n return value;\n }\n\n function parsePower(): number {\n const base = parseUnary();\n if (peek() === \"^\") return Math.pow(base, parsePower());\n return base;\n }\n\n function parseUnary(): number {\n if (peek() === \"-\") {\n next();\n return -parseUnary();\n }\n return parseAtom();\n }\n\n function parseAtom(): number {\n const t = next();\n if (t === \"(\") {\n const v = parseExpr();\n next(); // consume ')'\n return v;\n }\n if (t === \"sqrt(\") {\n const v = parseExpr();\n next(); // consume ')'\n return Math.sqrt(v);\n }\n return parseFloat(t);\n }\n\n return parseExpr();\n}\n\nexport default async function handler(req: Request): Promise {\n const url = new URL(req.url);\n\n // ?expr=... returns JSON instead of HTML\n if (url.searchParams.has(\"expr\")) {\n const expr = url.searchParams.get(\"expr\")!;\n try {\n return Response.json({ expr, result: solveExpression(expr) });\n } catch {\n return Response.json({ expr, error: \"Could not parse expression\" }, {\n status: 400,\n });\n }\n }\n\n return serveFile(req, \"index.html\");\n}\n",[166],"50e89d41-2b57-4b2c-afd6-747db8ef09a4","index.html","070fa48a-9c44-11f1-b82b-1607ee4eb77e",2,["D",1787195141531],"\n\n \n \n \n Math Expression Solver\n \n \n \n

🧮 Math Expression Solver

\n \n \n

\n Try: 2 + 3 * 4 · (10 - 4) / 3 · 2^8 · sqrt(16) + 5\n

\n \n \n\n",[172],"396aa495-d4fd-4f59-96b2-d1e7df3c56f5","client.ts","4eccc6ea-9c44-11f1-a87a-1607ee4eb77e",6,["D",1787195261886],"// Client-side logic for the math expression solver page.\nconst input = document.getElementById(\"input\") as HTMLInputElement;\nconst result = document.getElementById(\"result\")!;\n\nasync function solve(): Promise {\n const expr = input.value.trim();\n if (!expr) return;\n result.textContent = \"…\";\n const res = await fetch(\"?expr=\" + encodeURIComponent(expr));\n const data = await res.json();\n result.className = \"result\" + (data.error ? \" error\" : \"\");\n result.textContent = data.error ? \"❌ \" + data.error : expr + \" = \" + data.result;\n}\n\n(document.getElementById(\"solve\") as HTMLButtonElement).onclick = solve;\ninput.addEventListener(\"keydown\", (e) => {\n if (e.key === \"Enter\") solve();\n});\n",[179],"pulls","branches","forks","envVars",{"_192":68,"_194":68},"connections",{"_192":68,"_193":68},"count","unfilledCount","emptyCount",{"_48":178,"_38":179,"_36":180,"_142":-5,"_46":47,"_45":181,"_144":54,"_43":217,"_13":68,"_39":155,"_41":183,"_30":54,"_148":-5,"_202":218,"_33":219},{"_48":171,"_38":172,"_36":173,"_142":-5,"_46":47,"_45":174,"_144":54,"_43":214,"_13":68,"_39":26,"_41":176,"_30":54,"_148":-5,"_202":215,"_33":216},{"_48":165,"_38":166,"_36":167,"_142":-5,"_46":47,"_45":146,"_144":54,"_43":211,"_13":68,"_39":40,"_41":169,"_30":54,"_148":-5,"_202":212,"_33":213},{"_48":158,"_38":159,"_36":63,"_142":-5,"_46":47,"_45":160,"_144":31,"_43":208,"_13":162,"_39":40,"_41":163,"_30":54,"_148":-5,"_202":209,"_33":210},{"_48":150,"_38":151,"_36":152,"_142":-5,"_46":47,"_45":153,"_144":54,"_43":205,"_13":68,"_39":155,"_41":156,"_30":54,"_148":-5,"_202":206,"_33":207},{"_48":139,"_38":140,"_36":141,"_142":-5,"_46":47,"_45":143,"_144":54,"_43":201,"_13":146,"_39":40,"_41":147,"_30":54,"_148":-5,"_202":203,"_33":204},["D",1787195414023],"children",[],[140],["D",1787195150983],[],[151],["D",1787195321120],[],[159],["D",1787195171383],[],[166],["D",1787195141531],[],[172],["D",1787195261886],[],[179],["D",1787195127072],{"_102":101,"_110":106},{"_102":101,"_103":104,"_105":106,"_19":61,"_107":108,"_109":54},{"_13":91,"_38":92,"_48":47,"_93":49,"_94":-5,"_95":-5,"_96":-5,"_97":-5,"_98":-5,"_99":50,"_100":101},"ctx",{"_84":-5,"_130":257,"_258":259,"_260":261,"_262":54,"_263":54,"_264":54,"_265":31,"_266":-5,"_267":-7,"_268":-7,"_269":68,"_270":54,"_271":54,"_272":-5,"_273":54,"_274":54,"_275":54,"_276":-5},"ENV",{"_228":229,"_230":231,"_232":92,"_233":234,"_235":236,"_237":238,"_239":240,"_241":242,"_243":244,"_245":246,"_247":248,"_249":250,"_251":252,"_253":254,"_255":256},"REACT_APP_SENTRY_DSN","https://586020d86f05489db63a554690acf1e9@o1398359.ingest.sentry.io/6724499","RENDER_GIT_COMMIT","e87eb04e707cf64e7e532c8e8ec395f209e17f15","RENDER_GIT_BRANCH","POSTHOG_API_TOKEN","phc_nmoyuAkStEZuUp69rYlg1DZgrIt19Gx0Y4Hwf8tGgJP","POSTHOG_API_HOST","https://wart.val.town","WEB_API_TEMPLATE","https://{val}.web.val.run","APP_URL","https://www.val.town","MODULE_URL","https://esm.town","VANITY_WEB_API_TEMPLATE","https://{label}.val.run/","DENOLS_URL","https://lsp.val.town","NODE_ENV","production","CLOUDFLARE_TURNSTILE_SITE_KEY","0x4AAAAAACtaIZJH7s9rBMZ6","GOOGLE_CLIENT_ID","875989696899-jtsqkhlbdv5jrlsk8631p7ipjg3c6o62.apps.googleusercontent.com","STRIPE_PUBLISHABLE_KEY","pk_live_51N2zvWEpZTTLipIkVEwXrUG9AT0yeOOEYxszarZT1jpsZV58Ly6wlg3SltZpHN26CUalOBmUSY7adQRQiSkCZz2500qSXNkf8Y","API_URL","https://api.val.town",[],"preferencesKeybindings","default","preferencesTheme","light","preferencesFixers","preferencesCopilot","preferencesSelectionAi","preferencesCloseBrackets","preferencesChatPanelState","preferencesDprint","preferencesDenofmt","notificationCount","flagDenols","isBusinessOrgMember","businessOrgHandle","isBusinessOrgAdmin","isHigherTownieTier","navCollapsed","currentOrgId"]

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