refactoring

scripts/background/result.js

@@ -0,0 +1,34 @@
+class ExtractResult {
+    constructor(data) {
+        this._data = data || [];
+
+    }
+    row(index) {
+        return this._data[index];
+    }
+    column(index) {
+        return [...new Array(this._data.length).keys()].map(
+            i => this._data[i][index]
+        );
+    }
+    squash() {
+        return this._data.reduce((p, c) => p.concat(c), []);
+    }
+    get data() {
+        return this._data;
+    }
+    toString(rowsCount) {
+        let data = rowsCount > 0 ? this._data.slice(0, rowsCount) : this._data;
+        return data.slice().reduce(
+            (csv, lineCells) => {
+                let line = lineCells.reduce(
+                    (lineText, cell, idx) => {
+                        cell = '"' + cell.trim().replace(/"/g, '""') + '"';
+                        return lineText + cell + (idx == lineCells.length - 1 ? "" : ",")
+                    }, "");
+                return csv + line + "\n";
+            },
+            ""
+        );
+    }
+}