Function parse

src/io/csv.js:25–130

(csv, options, reviver = v => v)

SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
export function parse (csv, options, reviver = v => v) {
  const ctx = Object.create(null);
  ctx.options = options || {};
  ctx.reviver = reviver;
  ctx.value = '';
  ctx.entry = [];
  ctx.output = [];
  ctx.col = 1;
  ctx.row = 1;

  ctx.options.delimiter = ctx.options.delimiter === undefined ? '"' : options.delimiter;
  if(ctx.options.delimiter.length > 1 || ctx.options.delimiter.length === 0)
    throw Error(`CSVError: delimiter must be one character [${ctx.options.separator}]`);

  ctx.options.separator = ctx.options.separator === undefined ? ',' : options.separator;
  if(ctx.options.separator.length > 1 || ctx.options.separator.length === 0)
    throw Error(`CSVError: separator must be one character [${ctx.options.separator}]`);

  const lexer = new RegExp(`${escapeRegExp(ctx.options.delimiter)}|${escapeRegExp(ctx.options.separator)}|\r\n|\n|\r|[^${escapeRegExp(ctx.options.delimiter)}${escapeRegExp(ctx.options.separator)}\r\n]+`, 'y');
  const isNewline = /^(\r\n|\n|\r)$/;

  let matches = [];
  let match = '';
  let state = 0;

  while ((matches = lexer.exec(csv)) !== null) {
    match = matches[0];

    switch (state) {
      case 0: // start of entry
        switch (true) {
          case match === ctx.options.delimiter:
            state = 3;
            break;
          case match === ctx.options.separator:
            state = 0;
            valueEnd(ctx);
            break;
          case isNewline.test(match):
            state = 0;
            valueEnd(ctx);
            entryEnd(ctx);
            break;
          default:
            ctx.value += match;
            state = 2;
            break;
        }
        break;
      case 2: // un-delimited input
        switch (true) {
          case match === ctx.options.separator:
            state = 0;
            valueEnd(ctx);
            break;
          case isNewline.test(match):
            state = 0;
            valueEnd(ctx);