Modernized SheetClip for use in TypeScript

.gitignore

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+/node_modules

dist/index.cjs.js

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+'use strict';
+
+/**
+ * SheetClip - Spreadsheet Clipboard Parser
+ * version 0.3
+ *
+ * This tiny library transforms JavaScript arrays to strings that are pasteable by LibreOffice, OpenOffice,
+ * Google Docs and Microsoft Excel.
+ *
+ * Copyright 2012, Marcin Warpechowski
+ * Licensed under the MIT license.
+ * http://github.com/warpech/sheetclip/
+ */
+// Class Definition
+class SheetClip {
+    parse(str) {
+        const result = [];
+        let a = 0;
+        let multiline;
+        let last;
+        const rows = str.split('\n');
+        if (rows.length > 1 && rows[rows.length - 1] === '')
+            rows.pop();
+        for (let r = 0; r < rows.length; r++) {
+            const row = rows[r].split('\t');
+            for (let c = 0; c < row.length; c++) {
+                if (!result[a])
+                    result[a] = [];
+                if (multiline && c === 0) {
+                    last = result[a].length - 1;
+                    result[a][last] = result[a][last] + '\n' + row[0];
+                    if (multiline && (countQuotes(row[0]) & 1)) { //& 1 is a bitwise way of performing mod 2
+                        multiline = false;
+                        result[a][last] = result[a][last].substring(0, result[a][last].length - 1).replace(/""/g, '"');
+                    }
+                }
+                else {
+                    if (c === row.length - 1 && row[c].indexOf('"') === 0 && (countQuotes(row[c]) & 1)) {
+                        result[a].push(row[c].substring(1).replace(/""/g, '"'));
+                        multiline = true;
+                    }
+                    else {
+                        result[a].push(row[c].replace(/""/g, '"'));
+                        multiline = false;
+                    }
+                }
+            }
+            if (!multiline)
+                a++;
+        }
+        return result;
+    }
+    stringify(input) {
+        let result = "";
+        for (let r = 0; r < input.length; r++) {
+            const row = input[r];
+            for (let c = 0; c < row.length; c++) {
+                if (c > 0)
+                    result += '\t';
+                const val = row[c];
+                if (typeof val === 'string') {
+                    if (val.indexOf('\n') > -1) {
+                        result += '"' + val.replace(/"/g, '""') + '"';
+                    }
+                    else {
+                        result += val;
+                    }
+                }
+                else if (val === null || val === undefined) {
+                    result += '';
+                }
+                else {
+                    result += val;
+                }
+            }
+            result += '\n';
+        }
+        return result;
+    }
+}
+// Private Static Functions
+function countQuotes(str) {
+    return str.split('"').length - 1;
+}
+
+exports.SheetClip = SheetClip;

dist/index.d.ts

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+/**
+ * SheetClip - Spreadsheet Clipboard Parser
+ * version 0.3
+ *
+ * This tiny library transforms JavaScript arrays to strings that are pasteable by LibreOffice, OpenOffice,
+ * Google Docs and Microsoft Excel.
+ *
+ * Copyright 2012, Marcin Warpechowski
+ * Licensed under the MIT license.
+ * http://github.com/warpech/sheetclip/
+ */
+declare class SheetClip {
+    parse(str: string): string[];
+    stringify(input: string[]): string;
+}
+
+export { SheetClip };

dist/index.esm.js

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+/**
+ * SheetClip - Spreadsheet Clipboard Parser
+ * version 0.3
+ *
+ * This tiny library transforms JavaScript arrays to strings that are pasteable by LibreOffice, OpenOffice,
+ * Google Docs and Microsoft Excel.
+ *
+ * Copyright 2012, Marcin Warpechowski
+ * Licensed under the MIT license.
+ * http://github.com/warpech/sheetclip/
+ */
+// Class Definition
+class SheetClip {
+    parse(str) {
+        const result = [];
+        let a = 0;
+        let multiline;
+        let last;
+        const rows = str.split('\n');
+        if (rows.length > 1 && rows[rows.length - 1] === '')
+            rows.pop();
+        for (let r = 0; r < rows.length; r++) {
+            const row = rows[r].split('\t');
+            for (let c = 0; c < row.length; c++) {
+                if (!result[a])
+                    result[a] = [];
+                if (multiline && c === 0) {
+                    last = result[a].length - 1;
+                    result[a][last] = result[a][last] + '\n' + row[0];
+                    if (multiline && (countQuotes(row[0]) & 1)) { //& 1 is a bitwise way of performing mod 2
+                        multiline = false;
+                        result[a][last] = result[a][last].substring(0, result[a][last].length - 1).replace(/""/g, '"');
+                    }
+                }
+                else {
+                    if (c === row.length - 1 && row[c].indexOf('"') === 0 && (countQuotes(row[c]) & 1)) {
+                        result[a].push(row[c].substring(1).replace(/""/g, '"'));
+                        multiline = true;
+                    }
+                    else {
+                        result[a].push(row[c].replace(/""/g, '"'));
+                        multiline = false;
+                    }
+                }
+            }
+            if (!multiline)
+                a++;
+        }
+        return result;
+    }
+    stringify(input) {
+        let result = "";
+        for (let r = 0; r < input.length; r++) {
+            const row = input[r];
+            for (let c = 0; c < row.length; c++) {
+                if (c > 0)
+                    result += '\t';
+                const val = row[c];
+                if (typeof val === 'string') {
+                    if (val.indexOf('\n') > -1) {
+                        result += '"' + val.replace(/"/g, '""') + '"';
+                    }
+                    else {
+                        result += val;
+                    }
+                }
+                else if (val === null || val === undefined) {
+                    result += '';
+                }
+                else {
+                    result += val;
+                }
+            }
+            result += '\n';
+        }
+        return result;
+    }
+}
+// Private Static Functions
+function countQuotes(str) {
+    return str.split('"').length - 1;
+}
+
+export { SheetClip };