feat(inputs): ✨ Add Set variable step

packages/bot-engine/src/services/variable.ts

@@ -0,0 +1,46 @@
+import { Table, Variable } from 'models'
+import { isDefined } from 'utils'
+
+const safeEval = eval
+
+export const stringContainsVariable = (str: string): boolean =>
+  /\{\{(.*?)\}\}/g.test(str)
+
+export const parseVariables = (
+  text: string,
+  variables: Table<Variable>
+): string => {
+  if (text === '') return text
+  return text.replace(/\{\{(.*?)\}\}/g, (_, fullVariableString) => {
+    const matchedVarName = fullVariableString.replace(/{{|}}/g, '')
+    const matchedVariableId = variables.allIds.find((variableId) => {
+      const variable = variables.byId[variableId]
+      return matchedVarName === variable.name && isDefined(variable.value)
+    })
+    return variables.byId[matchedVariableId ?? '']?.value ?? ''
+  })
+}
+
+export const isMathFormula = (str?: string) =>
+  ['*', '/', '+', '-'].some((val) => str && str.includes(val))
+
+export const evaluateExpression = (str: string) => {
+  let result = replaceCommasWithDots(str)
+  try {
+    const evaluatedNumber = safeEval(result) as number
+    if (countDecimals(evaluatedNumber) > 2) {
+      return evaluatedNumber.toFixed(2)
+    }
+    return evaluatedNumber.toString()
+  } catch (err) {
+    return result
+  }
+}
+
+const replaceCommasWithDots = (str: string) =>
+  str.replace(new RegExp(/(\d+)(,)(\d+)/, 'g'), '$1.$3')
+
+const countDecimals = (value: number) => {
+  if (value % 1 != 0) return value.toString().split('.')[1].length
+  return 0
+}