Add table formatting on paste of detected table (#957)

src/components/editor-page/editor-pane/table-extractor.test.ts

@@ -0,0 +1,99 @@
+/*
+ * SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { convertClipboardTableToMarkdown, isTable } from './table-extractor'
+
+describe('isTable detection: ', () => {
+
+  it('empty string is no table', () => {
+    expect(isTable(''))
+      .toBe(false)
+  })
+
+  it('single line is no table', () => {
+    const input = 'some none table'
+    expect(isTable(input))
+      .toBe(false)
+  })
+
+  it('multiple lines without tabs are no table', () => {
+    const input = 'some none table\nanother line'
+    expect(isTable(input))
+      .toBe(false)
+  })
+
+  it('code blocks are no table', () => {
+    const input = '```python\ndef a:\n\tprint("a")\n\tprint("b")```'
+    expect(isTable(input))
+      .toBe(false)
+  })
+
+  it('tab-indented text is no table', () => {
+    const input = '\tsome tab indented text\n\tabc\n\tdef'
+    expect(isTable(input))
+      .toBe(false)
+  })
+
+  it('not equal number of tabs is no table', () => {
+    const input = '1 ...\n2\tabc\n3\td\te\tf\n4\t16'
+    expect(isTable(input))
+      .toBe(false)
+  })
+
+  it('table without newline at end is valid', () => {
+    const input = '1\t1\n2\t4\n3\t9\n4\t16\n5\t25'
+    expect(isTable(input))
+      .toBe(true)
+  })
+
+  it('table with newline at end is valid', () => {
+    const input = '1\t1\n2\t4\n3\t9\n4\t16\n5\t25\n'
+    expect(isTable(input))
+      .toBe(true)
+  })
+
+  it('table with some first cells missing is valid', () => {
+    const input = '1\t1\n\t0\n\t0\n4\t16\n5\t25\n'
+    expect(isTable(input))
+      .toBe(true)
+  })
+
+  it('table with some last cells missing is valid', () => {
+    const input = '1\t1\n2\t\n3\t\n4\t16\n'
+    expect(isTable(input))
+      .toBe(true)
+  })
+})
+
+describe('Conversion from clipboard table to markdown format', () => {
+  it('normal table without newline at end converts right', () => {
+    const input = '1\t1\ta\n2\t4\tb\n3\t9\tc\n4\t16\td'
+    expect(convertClipboardTableToMarkdown(input))
+      .toEqual('| #1 | #2 | #3 |\n| -- | -- | -- |\n| 1 | 1 | a |\n| 2 | 4 | b |\n| 3 | 9 | c |\n| 4 | 16 | d |')
+  })
+
+  it('normal table with newline at end converts right', () => {
+    const input = '1\t1\n2\t4\n3\t9\n4\t16\n'
+    expect(convertClipboardTableToMarkdown(input))
+      .toEqual('| #1 | #2 |\n| -- | -- |\n| 1 | 1 |\n| 2 | 4 |\n| 3 | 9 |\n| 4 | 16 |')
+  })
+
+  it('table with some first cells missing converts right', () => {
+    const input = '1\t1\n\t0\n\t0\n4\t16\n'
+    expect(convertClipboardTableToMarkdown(input))
+      .toEqual('| #1 | #2 |\n| -- | -- |\n| 1 | 1 |\n|  | 0 |\n|  | 0 |\n| 4 | 16 |')
+  })
+
+  it('table with some last cells missing converts right', () => {
+    const input = '1\t1\n2\t\n3\t\n4\t16\n'
+    expect(convertClipboardTableToMarkdown(input))
+      .toEqual('| #1 | #2 |\n| -- | -- |\n| 1 | 1 |\n| 2 |  |\n| 3 |  |\n| 4 | 16 |')
+  })
+
+  it('empty input results in empty output', () => {
+    expect(convertClipboardTableToMarkdown('')).toEqual('')
+  })
+})