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39 lines
1.7 KiB
39 lines
1.7 KiB
/**
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* Simple utilities for escaping/quoting/parsing CSV data.
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*
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* This only supports the default Excel-like encoding, in which fields containing any separators
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* or quotes get quoted (using '"'), and quotes get doubled.
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*
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* Quoting is also applied when values contain leading or trailing whitespace, and on parsing,
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* leading or trailing whitespace in unquoted values is trimmed, so that "," or ", " may be used
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* as a separator.
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*
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* This is intended for copy-pasting multi-choice values, where plain comma-separated text is the
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* most user-friendly, and CSV encoding is used to ensure we can handle arbitrary values.
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*/
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// Encode a row. If {prettier: true} is set, separate output with ", ". Leading whitespace gets
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// encoded in any case.
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export function csvEncodeRow(values: string[], options: {prettier?: boolean} = {}): string {
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return values.map(csvEncodeCell).join(options.prettier ? ", " : ",");
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}
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export function csvDecodeRow(text: string): string[] {
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// Clever regexp from https://github.com/micnews/csv-line
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const parts = text.split(/((?:(?:"[^"]*")|[^,])*)/);
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const main = parts.filter((v, idx) => idx % 2).map(csvDecodeCell);
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// The "delimiter" (odd-numbered parts) is our content. If it's not at the start/end, it means
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// we have commas, and should include empty fields at those ends.
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if (parts[0]) { main.unshift(""); }
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if (parts[parts.length - 1]) { main.push(""); }
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return main;
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}
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export function csvEncodeCell(value: string): string {
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return /[,\r\n"]|^\s|\s$/.test(value) ? '"' + value.replace(/"/g, '""') + '"' : value;
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}
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export function csvDecodeCell(value: string): string {
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return value.trim().replace(/^"|"$/g, '').replace(/""/g, '"');
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}
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