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const fs = require('fs') | |
const path = require('path') | |
const csv = require('csv') | |
const request = require('request') | |
const getRemoteFileContent = (url) => { | |
return new Promise((resolve, reject) => { | |
request(url, (err, response) => { | |
if (err) return reject(err) | |
return resolve(response.body) | |
}) | |
}) | |
} | |
// parse the csv into a JSON structure -- { '01': 'KS', ... } | |
const transformStateFile = (csvData) => { | |
return new Promise((resolve, reject) => { | |
csv.parse(csvData, { delimiter: '|', from: 2 }, (err, data) => { | |
if (err) return reject(err) | |
return resolve(data.reduce((result, row) => { | |
result[row[0]] = row[1] | |
return result | |
}, {})) | |
}) | |
}) | |
} | |
const transformCdZipFile = (csvData, states) => { | |
return new Promise((resolve, reject) => { | |
csv.parse(csvData, { from: 2 }, (err, data) => { | |
if (err) return reject(err) | |
return resolve(data.reduce((result, row) => { | |
// Not a valid row if there aren't exactly 3 columns | |
if (row.length !== 3) return result | |
const cdKey = `${states[row[0]]}-${row[2]}` | |
if (!result[cdKey]) result[cdKey] = [] | |
result[cdKey].push(row[1]) | |
return result | |
}, {})) | |
}) | |
}) | |
} | |
const writeDataToFile = (filePath, cdZips) => { | |
return new Promise((resolve, reject) => { | |
fs.writeFile(filePath, JSON.stringify(cdZips), (err, result) => { | |
if (err) return reject(err) | |
return resolve(result) | |
}) | |
}) | |
} | |
getRemoteFileContent('https://www2.census.gov/geo/docs/reference/state.txt') | |
.then(transformStateFile) | |
.then(states => { | |
return getRemoteFileContent('https://www2.census.gov/geo/relfiles/cdsld16/natl/natl_zccd_delim.txt') | |
// First line of csvData is garbage | |
.then(csvData => transformCdZipFile(csvData.split('\n').slice(1).join('\n'), states)) | |
}) | |
.then(cdZips => { | |
return writeDataToFile('./data/cd-zips.json', cdZips) | |
}) | |
.then(() => { console.log('Done!') }) | |
.catch(console.log) |
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