add chart module (refactoring)

src/chart.js

@@ -0,0 +1,34 @@
+import dereference from 'react-chart-editor/lib/lib/dereference'
+
+export function getDataSourcesFromSqlResult (sqlResult) {
+  if (!sqlResult) {
+    return {}
+  }
+  const dataSorces = {}
+  const matrix = sqlResult.values
+  const [row] = matrix
+  const transposedMatrix = row.map((value, column) => matrix.map(row => row[column]))
+  sqlResult.columns.forEach((column, index) => {
+    dataSorces[column] = transposedMatrix[index]
+  })
+  return dataSorces
+}
+
+export function getOptionsFromDataSources (dataSources) {
+  return Object.keys(dataSources).map(name => ({
+    value: name,
+    label: name
+  }))
+}
+
+export function getChartStateForSave (state, dataSources) {
+  // we don't need to save the data, only settings
+  // so we modify state.data using dereference
+  const stateCopy = JSON.parse(JSON.stringify(state))
+  const emptySources = {}
+  for (const key in dataSources) {
+    emptySources[key] = []
+  }
+  dereference(stateCopy.data, emptySources)
+  return stateCopy
+}