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simplified csv generator

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Djeeberjr 2025-10-20 14:29:47 +02:00
parent 141c1aa9cb
commit 2e75ba2908
1 changed files with 8 additions and 11 deletions
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19
web/src/lib/csv.ts
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@ -1,10 +1,9 @@
interface CSVOptions { interface CSVOptions {
delimiter?: string; // default: "," delimiter?: string;
includeHeader?: boolean; // default: true for object input, false for array-of-arrays unless headers provided headerOrder?: string[];
headerOrder?: string[]; // explicit ordering for columns that should come first eol?: string;
eol?: string; // default: "\r\n" includeBOM?: boolean;
includeBOM?: boolean; // default: false (useful for Excel) nullString?: string;
nullString?: string; // default: "" (how to render null/undefined)
} }
type RowObject = Record<string, any>; type RowObject = Record<string, any>;
@ -13,7 +12,6 @@ type InputRows = RowObject[];
export function generateCSVString(input: InputRows, opts: CSVOptions = {}): string { export function generateCSVString(input: InputRows, opts: CSVOptions = {}): string {
const { const {
delimiter = ",", delimiter = ",",
includeHeader,
headerOrder, headerOrder,
eol = "\r\n", eol = "\r\n",
includeBOM = false, includeBOM = false,
@ -29,7 +27,7 @@ export function generateCSVString(input: InputRows, opts: CSVOptions = {}): stri
const escapeCell = (raw: any): string => { const escapeCell = (raw: any): string => {
if (raw === null || raw === undefined) return nullString; if (raw === null || raw === undefined) return nullString;
let s = defaultStringify(raw); let s = stringify(raw);
// Replace quotes // Replace quotes
if (s.includes('"')) s = s.replace(/"/g, '""'); if (s.includes('"')) s = s.replace(/"/g, '""');
@ -38,7 +36,7 @@ export function generateCSVString(input: InputRows, opts: CSVOptions = {}): stri
}; };
// Transform the value of a cell into a string // Transform the value of a cell into a string
function defaultStringify(v: any): string { function stringify(v: any): string {
if (v === null || v === undefined) return nullString; if (v === null || v === undefined) return nullString;
if (v instanceof Date) return v.toLocaleDateString(); if (v instanceof Date) return v.toLocaleDateString();
if (typeof v === "boolean") return v ? "X" : ""; if (typeof v === "boolean") return v ? "X" : "";
@ -79,10 +77,9 @@ export function generateCSVString(input: InputRows, opts: CSVOptions = {}): stri
finalHeaders = first.concat(rest); finalHeaders = first.concat(rest);
} }
const shouldIncludeHeader = typeof includeHeader === "boolean" ? includeHeader : finalHeaders.length > 0;
const rowsOut: string[] = []; const rowsOut: string[] = [];
if (shouldIncludeHeader && finalHeaders.length) { if (finalHeaders.length > 0) {
rowsOut.push(finalHeaders.map(h => escapeCell(h)).join(delimiter)); rowsOut.push(finalHeaders.map(h => escapeCell(h)).join(delimiter));
} }