ztimson/utils
ztimson/utils
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Better CSV handling
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This commit is contained in:
Zakary Timson 2025-03-24 21:40:03 -04:00
parent e0085ecb6f
commit ff16f3bf9b
2 changed files with 25 additions and 11 deletions
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2
package.json
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@ -1,6 +1,6 @@
{
"name": "@ztimson/utils",
"version": "0.23.16",
"version": "0.23.17",
"description": "Utility library",
"author": "Zak Timson",
"license": "MIT",

34
src/csv.ts
View File

@ -10,16 +10,16 @@ import {LETTER_LIST} from './string.ts';
* @param hasHeaders First line of CSV contains headers
* @return {T[]} Array of parsed objects
*/
export function fromCsv<T = any>(csv: string, hasHeaders=true): T[] {
export function fromCsv<T = any>(csv: string, hasHeaders = true): T[] {
function parseLine(line: string): (string | null)[] {
const columns: string[] = [];
let current = '', inQuotes = false;
for(let i = 0; i < line.length; i++) {
for (let i = 0; i < line.length; i++) {
const char = line[i];
const nextChar = line[i + 1];
if (char === '"') {
if (inQuotes && nextChar === '"') {
current += '"';
current += '"'; // Handle escaped quotes
i++;
} else inQuotes = !inQuotes;
} else if (char === ',' && !inQuotes) {
@ -31,15 +31,29 @@ export function fromCsv<T = any>(csv: string, hasHeaders=true): T[] {
return columns.map(col => col.replace(/^"|"$/g, '').replace(/""/g, '"'));
}
const row = csv.split(/\r?\n/);
let headers: any = hasHeaders ? row.splice(0, 1)[0] : null;
if(headers) headers = headers.match(/(?:[^,"']+|"(?:[^"]|"")*"|'(?:[^']|'')*')+/g);
return <T[]>row.map(r => {
// Split rows
const rows = [];
let currentRow = '', inQuotes = false;
for (const char of csv) {
if (char === '"') inQuotes = !inQuotes;
if (char === '\n' && !inQuotes) {
rows.push(currentRow);
currentRow = '';
} else currentRow += char;
}
if(currentRow) rows.push(currentRow);
// Figure out headers
let headers: any = hasHeaders ? rows.splice(0, 1)[0] : null;
if (headers) headers = headers.match(/(?:[^,"']+|"(?:[^"]|"")*"|'(?:[^']|'')*')+/g);
// Parse rows
return <T[]>rows.map(r => {
const props = parseLine(r);
const h = headers || (Array(props.length).fill(null).map((r, i) => {
const h = headers || (Array(props.length).fill(null).map((_, i) => {
let letter = '';
const first = i / 26;
if(first > 1) letter += LETTER_LIST[Math.floor(first - 1)];
if (first > 1) letter += LETTER_LIST[Math.floor(first - 1)];
letter += LETTER_LIST[i % 26];
return letter;
}));
@ -65,7 +79,7 @@ export function toCsv(target: any, flatten=true) {
...t.map(row => headers.map((h: string) => {
const value = dotNotation<any>(row, h);
if(value == null) return '';
if(typeof value == 'object') return `"${JSONSanitize(value).replaceAll('`', '""')}"`;
if(typeof value == 'object') return `"${JSONSanitize(value).replaceAll('"', '""')}"`;
if(typeof value == 'string' && /[\n"]/g.test(value)) return `"${value.replaceAll('"', '""')}"`;
return value;
}).join(','))