avitext-parser/src/lib/csv.js

Parser for Avitext files.

/**
* Converts a value to a string appropriate for entry into a CSV table.  E.g., a string value will be surrounded by quotes.
* @param {string|number|object} theValue
* @param {string} sDelimiter The string delimiter.  Defaults to a double quote (") if omitted.
*/
function toCsvValue(theValue, sDelimiter) {
    const t = typeof (theValue);
    let output,
        stringDelimiter
    ;

    if (typeof (sDelimiter) === "undefined" || sDelimiter === null)
        stringDelimiter = '"';
    else
        stringDelimiter = sDelimiter;

    if (t === "undefined" || t === null)
        output = '';
    else if (t === 'string')
        output = sDelimiter + theValue + sDelimiter;
    else
        output = String(theValue);

    return output;
}

/**
* Converts an array of objects (with identical schemas) into a CSV table.
* @param {Array} objArray An array of objects.  Each object in the array must have the same property list.
* @param {string} sDelimiter The string delimiter.  Defaults to a double quote (") if omitted.
* @param {string} cDelimiter The column delimiter.  Defaults to a comma (,) if omitted.
* @return {string} The CSV equivalent of objArray.
*/
function toCsv(objArray, sDelimiter, cDelimiter) {
    let i, l, names = [], name, value, obj, row, output = "", n, nl;

    // Initialize default parameters.
    if (typeof (sDelimiter) === "undefined" || sDelimiter === null) {
        sDelimiter = '"';
    }
    if (typeof (cDelimiter) === "undefined" || cDelimiter === null) {
        cDelimiter = ",";
    }

    for (i = 0, l = objArray.length; i < l; i += 1) {
        // Get the names of the properties.
        obj = objArray[i];
        row = "";
        if (i === 0) {
            // Loop through the names
            for (name in obj) {
                if (obj.hasOwnProperty(name)) {
                    names.push(name);
                    row += [sDelimiter, name, sDelimiter, cDelimiter].join("");
                }
            }
            row = row.substring(0, row.length - 1);
            output += row;
        }

        output += "\n";
        row = "";
        for (n = 0, nl = names.length; n < nl; n += 1) {
            name = names[n];
            value = obj[name];
            if (n > 0) {
                row += ","
            }
            row += toCsvValue(value, '"');
        }
        output += row;
    }

    return output;
}

export {toCsv as default};