feat: custom validation properties panel

Related to #1162

packages/form-js-editor/src/features/properties-panel/PropertiesProvider.js

@@ -6,6 +6,7 @@ import {
   SerializationGroup,
   ConstraintsGroup,
   ValidationGroup,
+  CustomValidationsGroup,
   OptionsGroups,
   TableHeaderGroups,
   LayoutGroup,
@@ -66,6 +67,7 @@ export class PropertiesProvider {
         SerializationGroup(field, editField),
         ConstraintsGroup(field, editField),
         ValidationGroup(field, editField),
+        CustomValidationsGroup(field, editField, getService),
         CustomPropertiesGroup(field, editField),
       ].filter((group) => group != null);
 

packages/form-js-editor/src/features/properties-panel/entries/CustomValidationEntry.js

@@ -0,0 +1,109 @@
+import { get, set } from 'min-dash';
+
+import { useService } from '../hooks';
+
+import { FeelEntry, isFeelEntryEdited } from '@bpmn-io/properties-panel';
+import { useCallback } from 'preact/hooks';
+
+export function CustomValidationEntry(props) {
+  const { editField, field, idPrefix, index } = props;
+
+  const entries = [
+    {
+      component: Condition,
+      editField,
+      field,
+      id: idPrefix + '-condition',
+      idPrefix,
+      index,
+    },
+    {
+      component: Message,
+      editField,
+      field,
+      id: idPrefix + '-message',
+      idPrefix,
+      index,
+    },
+  ];
+
+  return entries;
+}
+
+function Condition(props) {
+  const { editField, field, id, index } = props;
+
+  const debounce = useService('debounce');
+
+  const setValue = (value, error) => {
+    if (error) {
+      return;
+    }
+
+    const validate = get(field, ['validate']);
+    const newValidate = set(validate, ['custom', index, 'condition'], value);
+
+    return editField(field, 'validate', newValidate);
+  };
+
+  const getValue = () => {
+    return get(field, ['validate', 'custom', index, 'condition']);
+  };
+
+  const conditionEntryValidate = useCallback((value) => {
+    if (typeof value !== 'string' || value.length === 0) {
+      return 'Must not be empty.';
+    }
+  }, []);
+
+  return FeelEntry({
+    feel: 'required',
+    isEdited: isFeelEntryEdited,
+    debounce,
+    element: field,
+    getValue,
+    id,
+    label: 'Condition',
+    setValue,
+    validate: conditionEntryValidate,
+  });
+}
+
+function Message(props) {
+  const { editField, field, id, index } = props;
+
+  const debounce = useService('debounce');
+
+  const setValue = (value, error) => {
+    if (error) {
+      return;
+    }
+
+    const validate = get(field, ['validate']);
+    const newValidate = set(validate, ['custom', index, 'message'], value);
+
+    return editField(field, 'validate', newValidate);
+  };
+
+  const getValue = () => {
+    return get(field, ['validate', 'custom', index, 'message']);
+  };
+
+  const messageEntryValidate = useCallback((value) => {
+    if (typeof value !== 'string' || value.length === 0) {
+      return 'Must not be empty.';
+    }
+  }, []);
+
+  return FeelEntry({
+    feel: 'optional',
+    isEdited: isFeelEntryEdited,
+    debounce,
+    element: field,
+    getValue,
+    id,
+    label: 'Message if condition not met',
+    setValue,
+    validate: messageEntryValidate,
+  });
+}

packages/form-js-editor/src/features/properties-panel/groups/CustomValidationsGroup.js

@@ -0,0 +1,80 @@
+import { get, set, without } from 'min-dash';
+
+import { arrayAdd } from '../Util';
+
+import { ListGroup } from '@bpmn-io/properties-panel';
+
+import { VALIDATION_TYPE_OPTIONS } from './ValidationGroup';
+import { CustomValidationEntry } from '../entries/CustomValidationEntry';
+
+export function CustomValidationsGroup(field, editField, getService) {
+  const validate = get(field, ['validate'], {});
+  const { validatable, keyed } = getService('formFields').get(field.type).config;
+
+  const isValidatable = validatable !== undefined ? validatable : keyed;
+  const isCustomValidation = [undefined, VALIDATION_TYPE_OPTIONS.custom.value].includes(validate.validationType);
+  const shouldRender = isValidatable && isCustomValidation;
+
+  if (!shouldRender) {
+    return;
+  }
+
+  return {
+    id: 'custom-validation',
+    label: 'Custom validations',
+    tooltip: "Define custom validation rules for this field. Use 'value' to reference the field value.",
+    component: ListGroup,
+    ...CustomValidationsEntry({ editField, field, id: 'custom-validation-list' }),
+  };
+}
+
+export function CustomValidationsEntry(props) {
+  const { editField, field, id: idPrefix } = props;
+
+  const addEntry = (e) => {
+    e.stopPropagation();
+
+    const customValidations = get(field, ['validate', 'custom'], []);
+    const newIndex = customValidations.length + 1;
+
+    const newValue = {
+      condition: '=false',
+      message: 'Error message.',
+    };
+
+    const newArray = arrayAdd(customValidations, newIndex, newValue);
+    const newValidate = set(field.validate || {}, ['custom'], newArray);
+
+    editField(field, ['validate'], newValidate);
+  };
+
+  const removeEntry = (entry) => {
+    const customValidations = get(field, ['validate', 'custom'], []);
+    const newArray = without(customValidations, entry);
+    const newValidate = set(field.validate, ['custom'], newArray);
+
+    editField(field, ['validate'], newValidate);
+  };
+
+  const items = get(field, ['validate', 'custom'], []).map((entry, index) => {
+    const id = idPrefix + '-' + index;
+
+    return {
+      id,
+      entries: CustomValidationEntry({
+        editField,
+        field,
+        idPrefix,
+        index,
+      }),
+      label: 'Rule ' + (index + 1),
+      remove: () => removeEntry(entry),
+    };
+  });
+
+  return {
+    items,
+    add: addEntry,
+    shouldSort: false,
+  };
+}

packages/form-js-editor/src/features/properties-panel/groups/ValidationGroup.js

@@ -14,7 +14,7 @@ import { useService, useVariables } from '../hooks';
 
 import { INPUTS } from '../Util';
 
-const VALIDATION_TYPE_OPTIONS = {
+export const VALIDATION_TYPE_OPTIONS = {
   custom: {
     value: '',
     label: 'Custom',

packages/form-js-editor/src/features/properties-panel/groups/index.js

@@ -2,6 +2,7 @@ export { GeneralGroup } from './GeneralGroup';
 export { SerializationGroup } from './SerializationGroup';
 export { ConstraintsGroup } from './ConstraintsGroup';
 export { ValidationGroup } from './ValidationGroup';
+export { CustomValidationsGroup } from './CustomValidationsGroup';
 export { OptionsGroups } from './OptionsGroups';
 export { CustomPropertiesGroup } from './CustomPropertiesGroup';
 export { AppearanceGroup } from './AppearanceGroup';

packages/form-js-viewer/src/render/components/form-fields/ExpressionField.js

@@ -45,6 +45,7 @@ ExpressionField.config = {
   label: 'Expression',
   group: 'basic-input',
   keyed: true,
+  validatable: false,
   emptyValue: null,
   escapeGridRender: true,
   create: (options = {}) => ({