file formats refactor

packages/web/src/fileformats/csv.ts

@@ -0,0 +1,7 @@
+export default {
+  storageType: 'csv',
+  extension: 'csv',
+  readerFunc: 'csvReader',
+  writerFunc: 'csvWriter',
+  filesTitle: 'CSV files',
+};

packages/web/src/fileformats/excel.ts

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+export default {
+  storageType: 'excel',
+  extension: 'xlsx',
+  readerFunc: 'excelSheetReader',
+  filesTitle: 'MS Excel files',
+};

packages/web/src/fileformats/index.ts

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+import csv from './csv';
+import jsonl from './jsonl';
+import excel from './excel';
+import { FileFormatDefinition } from './types';
+
+export const fileformats = [csv, jsonl, excel];
+
+export function findFileFormat(storageType): FileFormatDefinition {
+  return fileformats.find((x) => x.storageType == storageType);
+}
+
+export function getFileFormatDirections(format: FileFormatDefinition) {
+  if (!format) return [];
+  const res = [];
+  if (format.readerFunc) res.push('source');
+  if (format.writerFunc) res.push('target');
+  return res;
+}
+
+export const defaultFileFormat = csv;

packages/web/src/fileformats/jsonl.ts

@@ -0,0 +1,7 @@
+export default {
+  storageType: 'jsonl',
+  extension: 'jsonl',
+  readerFunc: 'jsonLinesReader',
+  writerFunc: 'jsonLinesWriter',
+  filesTitle: 'JSON lines',
+};

packages/web/src/fileformats/types.ts

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+export interface FileFormatDefinition {
+  storageType: string;
+  extension: string;
+  readerFunc?: string;
+  writerFunc?: string;
+  filesTitle: string;
+}