ztimson/utils
ztimson/utils
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Better CSV handling
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Zakary Timson 2025-03-24 23:01:57 -04:00
parent ff16f3bf9b
commit f9fc4fb7ff
2 changed files with 10 additions and 9 deletions
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2
package.json
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@ -1,6 +1,6 @@
{ {
"name": "@ztimson/utils", "name": "@ztimson/utils",
"version": "0.23.17", "version": "0.23.18",
"description": "Utility library", "description": "Utility library",
"author": "Zak Timson", "author": "Zak Timson",
"license": "MIT", "license": "MIT",

17
src/csv.ts
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@ -23,29 +23,29 @@ export function fromCsv<T = any>(csv: string, hasHeaders = true): T[] {
i++; i++;
} else inQuotes = !inQuotes; } else inQuotes = !inQuotes;
} else if (char === ',' && !inQuotes) { } else if (char === ',' && !inQuotes) {
columns.push(current); columns.push(current.trim()); // Trim column values
current = ''; current = '';
} else current += char; } else current += char;
} }
columns.push(current); columns.push(current.trim()); // Trim last column value
return columns.map(col => col.replace(/^"|"$/g, '').replace(/""/g, '"')); return columns.map(col => col.replace(/^"|"$/g, '').replace(/""/g, '"'));
} }
// Split rows // Normalize line endings and split rows
const rows = []; const rows = [];
let currentRow = '', inQuotes = false; let currentRow = '', inQuotes = false;
for (const char of csv) { for (const char of csv.replace(/\r\n/g, '\n')) { // Normalize \r\n to \n
if (char === '"') inQuotes = !inQuotes; if (char === '"') inQuotes = !inQuotes;
if (char === '\n' && !inQuotes) { if (char === '\n' && !inQuotes) {
rows.push(currentRow); rows.push(currentRow.trim()); // Trim row
currentRow = ''; currentRow = '';
} else currentRow += char; } else currentRow += char;
} }
if(currentRow) rows.push(currentRow); if (currentRow) rows.push(currentRow.trim()); // Trim last row
// Figure out headers // Extract headers
let headers: any = hasHeaders ? rows.splice(0, 1)[0] : null; let headers: any = hasHeaders ? rows.splice(0, 1)[0] : null;
if (headers) headers = headers.match(/(?:[^,"']+|"(?:[^"]|"")*"|'(?:[^']|'')*')+/g); if (headers) headers = headers.match(/(?:[^,"']+|"(?:[^"]|"")*"|'(?:[^']|'')*')+/g)?.map((h: any) => h.trim());
// Parse rows // Parse rows
return <T[]>rows.map(r => { return <T[]>rows.map(r => {
@ -64,6 +64,7 @@ export function fromCsv<T = any>(csv: string, hasHeaders = true): T[] {
}); });
} }
/** /**
* Convert an array of objects to a CSV string * Convert an array of objects to a CSV string
* *