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TiddlyWiki5/core/modules/utils/csv.js
2022-11-20 17:51:01 +00:00

125 lines
2.7 KiB
JavaScript

/*\
title: $:/core/modules/utils/csv.js
type: application/javascript
module-type: utils
A barebones CSV parser
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
var QUOTE = '"';
var getCellInfo = function(text, start, length, SEPARATOR) {
var isCellQuoted = text.charAt(start) === QUOTE;
var cellStart = isCellQuoted ? start + 1 : start;
if (text.charAt(i) === SEPARATOR) {
return [cellStart, cellStart, false];
}
for (var i = cellStart; i < length; i++) {
var cellCharacter = text.charAt(i);
var isEOL = cellCharacter === "\n" || cellCharacter === "\r";
if (isEOL && !isCellQuoted) {
return [cellStart, i, false];
} else if (cellCharacter === SEPARATOR && !isCellQuoted) {
return [cellStart, i, false];
} else if (cellCharacter === QUOTE && isCellQuoted) {
var nextCharacter = i + 1 < length ? text.charAt(i + 1) : '';
if (nextCharacter !== QUOTE) {
return [cellStart, i, true];
} else {
i++;
}
}
}
return [cellStart, i, isCellQuoted];
}
exports.parseCsvString = function(text, options) {
if (!text) {
return [];
}
options = options || {};
var SEPARATOR = options.separator || ",",
length = text.length,
rows = [],
nextRow = [];
for (var i = 0; i < length; i++) {
var cellInfo = getCellInfo(text, i, length, SEPARATOR);
var cellText = text.substring(cellInfo[0], cellInfo[1]);
if (cellInfo[2]) {
cellText = cellText.replace(/""/g, '"');
cellInfo[1]++;
}
nextRow.push(cellText);
i = cellInfo[1];
var character = text.charAt(i);
var nextCharacter = i + 1 < length ? text.charAt(i + 1) : '';
if (character === "\r" || character === "\n") {
// Edge case for empty rows
if (nextRow.length === 1 && nextRow[0] === '') {
nextRow.length = 0;
}
rows.push(nextRow);
nextRow = [];
if (character === "\r") {
var nextCharacter = i + 1 < length ? text.charAt(i + 1) : '';
if (nextCharacter === "\n") {
i++;
}
}
}
}
// Special case if last cell in last row is an empty cell
if (text.charAt(length - 1) === SEPARATOR) {
nextRow.push("");
}
rows.push(nextRow);
return rows;
}
/*
Parse a CSV string with a header row and return an array of hashmaps.
*/
exports.parseCsvStringWithHeader = function(text,options) {
var csv = $tw.utils.parseCsvString(text, options);
var headers = csv[0];
csv = csv.slice(1);
for (var i = 0; i < csv.length; i++) {
var row = csv[i];
var rowObject = Object.create(null);
for(var columnIndex=0; columnIndex<headers.length; columnIndex++) {
var columnName = headers[columnIndex];
if (columnName) {
rowObject[columnName] = $tw.utils.trim(row[columnIndex] || "");
}
}
csv[i] = rowObject;
}
return csv;
}
})();