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var EOL = {},
EOF = {},
QUOTE = 34,
NEWLINE = 10,
RETURN = 13;
function objectConverter(columns) {
return new Function("d", "return {" + columns.map(function(name, i) {
return JSON.stringify(name) + ": d[" + i + "] || \"\"";
}).join(",") + "}");
}
function customConverter(columns, f) {
var object = objectConverter(columns);
return function(row, i) {
return f(object(row), i, columns);
};
}
// Compute unique columns in order of discovery.
function inferColumns(rows) {
var columnSet = Object.create(null),
columns = [];
rows.forEach(function(row) {
for (var column in row) {
if (!(column in columnSet)) {
columns.push(columnSet[column] = column);
}
}
});
return columns;
}
function pad(value, width) {
var s = value + "", length = s.length;
return length < width ? new Array(width - length + 1).join(0) + s : s;
}
function formatYear(year) {
return year < 0 ? "-" + pad(-year, 6)
: year > 9999 ? "+" + pad(year, 6)
: pad(year, 4);
}
function formatDate(date) {
var hours = date.getUTCHours(),
minutes = date.getUTCMinutes(),
seconds = date.getUTCSeconds(),
milliseconds = date.getUTCMilliseconds();
return isNaN(date) ? "Invalid Date"
: formatYear(date.getUTCFullYear(), 4) + "-" + pad(date.getUTCMonth() + 1, 2) + "-" + pad(date.getUTCDate(), 2)
+ (milliseconds ? "T" + pad(hours, 2) + ":" + pad(minutes, 2) + ":" + pad(seconds, 2) + "." + pad(milliseconds, 3) + "Z"
: seconds ? "T" + pad(hours, 2) + ":" + pad(minutes, 2) + ":" + pad(seconds, 2) + "Z"
: minutes || hours ? "T" + pad(hours, 2) + ":" + pad(minutes, 2) + "Z"
: "");
}
export default function(delimiter) {
var reFormat = new RegExp("[\"" + delimiter + "\n\r]"),
DELIMITER = delimiter.charCodeAt(0);
function parse(text, f) {
var convert, columns, rows = parseRows(text, function(row, i) {
if (convert) return convert(row, i - 1);
columns = row, convert = f ? customConverter(row, f) : objectConverter(row);
});
rows.columns = columns || [];
return rows;
}
function parseRows(text, f) {
var rows = [], // output rows
N = text.length,
I = 0, // current character index
n = 0, // current line number
t, // current token
eof = N <= 0, // current token followed by EOF?
eol = false; // current token followed by EOL?
// Strip the trailing newline.
if (text.charCodeAt(N - 1) === NEWLINE) --N;
if (text.charCodeAt(N - 1) === RETURN) --N;
function token() {
if (eof) return EOF;
if (eol) return eol = false, EOL;
// Unescape quotes.
var i, j = I, c;
if (text.charCodeAt(j) === QUOTE) {
while (I++ < N && text.charCodeAt(I) !== QUOTE || text.charCodeAt(++I) === QUOTE);
if ((i = I) >= N) eof = true;
else if ((c = text.charCodeAt(I++)) === NEWLINE) eol = true;
else if (c === RETURN) { eol = true; if (text.charCodeAt(I) === NEWLINE) ++I; }
return text.slice(j + 1, i - 1).replace(/""/g, "\"");
}
// Find next delimiter or newline.
while (I < N) {
if ((c = text.charCodeAt(i = I++)) === NEWLINE) eol = true;
else if (c === RETURN) { eol = true; if (text.charCodeAt(I) === NEWLINE) ++I; }
else if (c !== DELIMITER) continue;
return text.slice(j, i);
}
// Return last token before EOF.
return eof = true, text.slice(j, N);
}
while ((t = token()) !== EOF) {
var row = [];
while (t !== EOL && t !== EOF) row.push(t), t = token();
if (f && (row = f(row, n++)) == null) continue;
rows.push(row);
}
return rows;
}
function preformatBody(rows, columns) {
return rows.map(function(row) {
return columns.map(function(column) {
return formatValue(row[column]);
}).join(delimiter);
});
}
function format(rows, columns) {
if (columns == null) columns = inferColumns(rows);
return [columns.map(formatValue).join(delimiter)].concat(preformatBody(rows, columns)).join("\n");
}
function formatBody(rows, columns) {
if (columns == null) columns = inferColumns(rows);
return preformatBody(rows, columns).join("\n");
}
function formatRows(rows) {
return rows.map(formatRow).join("\n");
}
function formatRow(row) {
return row.map(formatValue).join(delimiter);
}
function formatValue(value) {
return value == null ? ""
: value instanceof Date ? formatDate(value)
: reFormat.test(value += "") ? "\"" + value.replace(/"/g, "\"\"") + "\""
: value;
}
return {
parse: parse,
parseRows: parseRows,
format: format,
formatBody: formatBody,
formatRows: formatRows,
formatRow: formatRow,
formatValue: formatValue
};
}
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