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* 高性能 CSV 解析器/序列化器
* 支持 RFC 4180 标准：引号转义、字段内换行、逗号处理
*/
export function parseCsv(text: string): string[][] {
const rows: string[][] = [];
const len = text.length;
let i = 0;
let row: string[] = [];
let field = '';
let inQuotes = false;
while (i < len) {
const ch = text[i];
if (inQuotes) {
if (ch === '"') {
if (i + 1 < len && text[i + 1] === '"') {
field += '"';
i += 2;
} else {
inQuotes = false;
i++;
}
} else {
field += ch;
i++;
}
} else {
if (ch === '"') {
inQuotes = true;
i++;
} else if (ch === ',') {
row.push(field);
field = '';
i++;
} else if (ch === '\r') {
row.push(field);
field = '';
rows.push(row);
row = [];
i++;
Eif (i < len && text[i] === '\n') i++;
} else if (ch === '\n') {
row.push(field);
field = '';
rows.push(row);
row = [];
i++;
} else {
field += ch;
i++;
}
}
}
if (field || row.length > 0) {
row.push(field);
rows.push(row);
}
return rows;
}
export function normalizeRows(rows: string[][]): string[][] {
if (rows.length === 0) return rows;
const maxCols = Math.max(...rows.map(r => r.length));
return rows.map(r => {
if (r.length < maxCols) {
const padded = [...r];
while (padded.length < maxCols) padded.push('');
return padded;
}
return r;
});
}
function escapeField(field: string): string {
if (field.includes(',') || field.includes('"') || field.includes('\n') || field.includes('\r')) {
return '"' + field.replace(/"/g, '""') + '"';
}
return field;
}
export function serializeCsv(headers: string[], rows: string[][]): string {
const lines: string[] = [];
lines.push(headers.map(escapeField).join(','));
for (const row of rows) {
lines.push(row.map(escapeField).join(','));
}
return lines.join('\n');
}
export interface ParsedCsv {
headers: string[];
rows: string[][];
}
export function parseAndSplit(text: string): ParsedCsv {
if (!text.trim()) return { headers: [], rows: [] };
const allRows = normalizeRows(parseCsv(text));
Iif (allRows.length === 0) return { headers: [], rows: [] };
return { headers: allRows[0], rows: allRows.slice(1) };
}
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