${c[1].toFixed(6)}, ${c[0].toFixed(6)}

`,\n )\n .join(\"\");\n\n layer.bindPopup(\n `\n

AREA_ID: ${\n feature.properties?.area_id ?? \"—\"\n }

VERTICES: ${vertices}

COORDS (lat, lon):

\n ${coordList}\n

\n `,\n { maxHeight: 100 },\n );\n },\n });\n\n layerGroupRef.current.addLayer(geoJsonLayer);\n\n // Fit map to bounds\n const bounds = geoJsonLayer.getBounds();\n if (bounds.isValid()) {\n mapInstanceRef.current.fitBounds(bounds, { padding: [20, 20] });\n }\n }\n } catch (error) {\n console.error(\"Failed to update map:\", error);\n }\n }\n }, [geojson]);\n\n return (\n

\n {!mapLoaded && (\n

\n INITIALIZING_MAP_ENGINE...\n

\n )}\n

\n );\n}\n\n// Status indicator component\nfunction StatusIndicator(\n { status, message }: {\n status: \"idle\" | \"loading\" | \"success\" | \"error\";\n message?: string;\n },\n) {\n const colors = {\n idle: \"text-gray-500\",\n loading: \"text-yellow-400\",\n success: \"text-emerald-400\",\n error: \"text-red-400\",\n };\n\n const symbols = {\n idle: \"●\",\n loading: \"◐\",\n success: \"✓\",\n error: \"✗\",\n };\n\n return (\n \n \n {symbols[status]}\n \n {message || status.toUpperCase()}\n \n );\n}\n\nfunction App() {\n const [input, setInput] = useState(\"\");\n const [inputType, setInputType] = useState<\"url\" | \"text\">(\"url\");\n const [loading, setLoading] = useState(false);\n const [result, setResult] = useState(null);\n const [showGeoJSON, setShowGeoJSON] = useState(false);\n\n const handleParse = async () => {\n if (!input.trim()) return;\n\n setLoading(true);\n try {\n const response = await fetch(\"/api/parse\", {\n method: \"POST\",\n headers: { \"Content-Type\": \"application/json\" },\n body: JSON.stringify({ input: input.trim(), type: inputType }),\n });\n\n const data: ParseResponse = await response.json();\n setResult(data);\n } catch (error) {\n setResult({\n success: false,\n features: [],\n geojson: { type: \"FeatureCollection\", features: [] },\n error: `REQUEST_FAILED: ${error.message}`,\n });\n } finally {\n setLoading(false);\n }\n };\n\n const handleDownload = async (format: \"geojson\" | \"shapefile\") => {\n if (!result?.geojson) return;\n\n try {\n const response = await fetch(\"/api/download\", {\n method: \"POST\",\n headers: { \"Content-Type\": \"application/json\" },\n body: JSON.stringify({\n geojson: result.geojson,\n provenance: result.provenance,\n format,\n }),\n });\n\n if (response.ok) {\n const blob = await response.blob();\n const url = URL.createObjectURL(blob);\n const a = document.createElement(\"a\");\n a.href = url;\n a.download = format === \"geojson\" ? \"polygons.geojson\" : \"polygons.csv\";\n document.body.appendChild(a);\n a.click();\n document.body.removeChild(a);\n URL.revokeObjectURL(url);\n }\n } catch (error) {\n console.error(\"Download failed:\", error);\n }\n };\n\n const exampleUrl =\n \"https://www.ecfr.gov/api/renderer/v1/content/enhanced/2025-09-10/title-28?chapter=I&part=202&subpart=N§ion=202.1401\";\n const exampleText =\n `Area ID\tLatitude/longitude coordinates of geofenced areas\n1\t38.935624, −77.207888\t38.931674, −77.199387\t38.929289, −77.203229\t38.932939, −77.209328.\n2\t38.950446, −77.125592\t38.952077, −77.120947\t38.947468, −77.120060\t38.947135, −77.122809.\n3\t38.953191, −77.372792\t38.953174, −77.369764\t38.951148, −77.369759\t38.951152, −77.372781.\n4\t39.113546, −76.777053\t39.131086, −76.758527\t39.100086, −76.749715\t39.093304, −76.760882.\n5\t33.416299, −82.172772\t33.416666, −82.164366\t33.406350, −82.163645\t33.406261, −82.172947.`;\n\n return (\n

\n {/* Header */}\n

\n GIS\n

\n eCFR_POLYGON_CONVERTER\n

\n GEOSPATIAL_DATA_EXTRACTION_ENGINE v2.1.0\n

\n\n

\n {/* Input Panel */}\n

\n INPUT_INTERFACE\n

\n \n

\n\n {/* Input Type Toggle */}\n

\n setInputType(\"url\")}\n className={`flex-1 py-2 px-3 rounded-md text-sm mono transition-all ${\n inputType === \"url\"\n ? \"bg-emerald-600 text-white\"\n : \"text-gray-400 hover:text-gray-200\"\n }`}\n >\n URL_ENDPOINT\n \n setInputType(\"text\")}\n className={`flex-1 py-2 px-3 rounded-md text-sm mono transition-all ${\n inputType === \"text\"\n ? \"bg-emerald-600 text-white\"\n : \"text-gray-400 hover:text-gray-200\"\n }`}\n >\n RAW_DATA\n \n

\n\n {/* Input Field */}\n

\n setInput(e.target.value)}\n placeholder={inputType === \"url\"\n ? \"https://www.ecfr.gov/api/...\"\n : \"Area ID 1\\n38.935624, −77.207888\\n...\"}\n className=\"w-full h-40 p-4 bg-gray-900 border border-gray-600 rounded-lg focus:ring-2 focus:ring-emerald-500 focus:border-transparent text-gray-100 mono text-sm resize-none\"\n />\n

\n {input.length} CHARS\n

\n\n {/* Action Buttons */}\n

\n \n setInput(inputType === \"url\" ? exampleUrl : exampleText)}\n className=\"text-sm text-emerald-400 hover:text-emerald-300 underline mono\"\n >\n LOAD_EXAMPLE\n \n {\n setInput(\"\");\n setResult(null);\n }}\n className=\"text-sm text-gray-500 hover:text-gray-400 underline mono\"\n >\n CLEAR_BUFFER\n \n

\n\n {/* Parse Button */}\n \n {loading\n ? (\n <>\n

\n PROCESSING...\n \n )\n : (\n \"EXECUTE_PARSE\"\n )}\n \n

\n\n {/* Results Panel */}\n {result && (\n

\n OUTPUT_RESULTS\n

\n\n {result.success\n ? (\n

\n {/* Polygon Details */}\n

POLYGONS_FOUND:

\n {result.features.length}\n

TOTAL_VERTICES:

\n {result.features.reduce(\n (sum, f) => sum + f.coords.length - 1,\n 0,\n )}\n

\n\n

\n {result.features.map((feature, idx) => (\n \n AREA_ID_{feature.area_id}\n {feature.coords.length - 1}_VERTICES\n

\n ))}\n

\n\n {/* Provenance Information */}\n {result.provenance && (\n

\n DATA_PROVENANCE\n

\n RETRIEVED:\n \n {new Date(result.provenance.retrieval_timestamp)\n .toLocaleString()}\n \n

\n \n SOURCE_TYPE:\n \n \n {result.provenance.source_type}\n \n

\n {result.provenance.source_url && (\n

\n \n SOURCE_URL:\n \n \n {result.provenance.source_url}\n \n

\n )}\n

\n PROCESSOR:\n \n {result.provenance.processor}{\" \"}\n v{result.provenance.processor_version}\n \n

\n )}\n\n {/* Export Buttons */}\n

\n handleDownload(\"geojson\")}\n className=\"bg-blue-600 hover:bg-blue-700 text-white py-2 px-4 rounded-lg mono text-sm font-semibold transition-colors\"\n >\n EXPORT_GEOJSON\n \n handleDownload(\"shapefile\")}\n className=\"bg-purple-600 hover:bg-purple-700 text-white py-2 px-4 rounded-lg mono text-sm font-semibold transition-colors\"\n >\n EXPORT_CSV\n \n

\n\n {/* GeoJSON Toggle */}\n setShowGeoJSON(!showGeoJSON)}\n className=\"w-full text-emerald-400 hover:text-emerald-300 underline mono text-sm\"\n >\n {showGeoJSON ? \"HIDE\" : \"SHOW\"}_RAW_GEOJSON\n \n\n {/* GeoJSON Display */}\n {showGeoJSON && (\n

\n                          {JSON.stringify(result.geojson, null, 2)}\n

\n )}\n

\n )\n : (\n

\n ERROR: {result.error || \"UNKNOWN_PARSE_FAILURE\"}\n

\n )}\n

\n\n {/* Map and Info Panel */}\n

\n {/* Map Panel */}\n

\n SPATIAL_VISUALIZATION\n

\n {result?.success && result.features.length > 0\n ? `${result.features.length} POLYGON${\n result.features.length > 1 ? \"S\" : \"\"\n } RENDERED`\n : \"AWAITING_GEOMETRY_DATA\"}\n

\n \n

\n\n {/* Technical Specifications */}\n

\n SYSTEM_SPECIFICATIONS\n

\n\n

\n SUPPORTED_PROTOCOLS\n

\n ●\n eCFR_API_ENDPOINTS\n
\n ●\n DECIMAL_DEGREES_FORMAT\n
\n ●\n TAB_DELIMITED_DATA\n
\n ●\n AREA_ID_PREFIXED_COORDS\n
\n ●\n UNICODE_MINUS_HANDLING\n

\n\n

\n OUTPUT_FORMATS\n

\n ●\n GEOJSON_RFC7946\n
\n ●\n CSV_COORDINATE_EXPORT\n
\n ●\n LEAFLET_VISUALIZATION\n
\n ●\n AUTO_POLYGON_CLOSURE\n
\n ●\n COORDINATE_VALIDATION\n

\n\n

\n PROCESSING_PIPELINE\n

1. INPUT_VALIDATION → URL_FETCH || TEXT_PARSE

2. COORDINATE_EXTRACTION → REGEX_PATTERN_MATCHING

3. POLYGON_CONSTRUCTION → VERTEX_VALIDATION

4. GEOJSON_SERIALIZATION → RFC7946_COMPLIANCE

5. SPATIAL_RENDERING → LEAFLET_INTEGRATION

\n \n );\n}\n// Mount the app only if a DOM exists\nif (typeof document !== \"undefined\") {\n const container = document.getElementById(\"root\");\n if (container) {\n const root = createRoot(container);\n root.render();\n }\n}","deleted","label",[168,150],"frontend","permalink","https://www.val.town/x/danny/polygonParser/code/frontend/index.tsx","extension","actionData","errors"]