feat: add chance.js for variables with random value.

package.json

@@ -18,6 +18,7 @@
   "dependencies": {
     "ace-builds": "^1.4.13",
     "axios": "^0.24.0",
+    "chance": "^1.1.8",
     "color": "^4.1.0",
     "color-name": "^1.1.4",
     "color-string": "^1.9.0",

src/models/Configuration.js

@@ -28,7 +28,6 @@ class Configuration {
     this.enabled = enabled
     this.values = values
     this.featureFlags = featureFlags
-
     this.globalVariables = Array.isArray(globalVariables) ? globalVariables : []
   }
 
@@ -265,6 +264,8 @@ class Configuration {
         return carry.concat(variable)
       }, [])
 
+    variables.push(new Variable('==CHANCE=JS==', '', '', global))
+
     if (bindValues) {
       return variables.map((variable) => {
         return variable.bind(this.getValue(variable.owner, variable.name))

src/models/Variable.js

@@ -11,24 +11,43 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+import chance from 'chance'
+import json5 from 'json5'
+
 class Variable {
   constructor(name, placeholder, description, owner = '') {
     this.name = name
     this.value = placeholder
     this.description = description
     this.owner = owner
     this.id = this.owner === '' ? this.name : this.owner + '::' + this.name
+    this.chanceGenerator = chance.Chance()
   }
 
   bind(value) {
     return new Variable(this.name, typeof value === 'string' ? value : this.value, this.description, this.owner)
   }
 
+  chance(value) {
+    return value.replace(/\${chance.([a-zA-Z0-9_-]*)(?:\((.*)\))?}/, (match, p1, p2) => {
+      let args
+      try {
+        args = json5.parse(p2)
+      } catch (e) {
+        args = ''
+      }
+      return this.chanceGenerator[p1](args)
+    })
+  }
+
   apply(value) {
-    if (typeof value === 'string') {
-      return value.replace('$' + this.name, this.value).replace('${' + this.name + '}', this.value)
+    if (typeof value !== 'string') {
+      return value
+    }
+    if (this.name === '==CHANCE=JS==') {
+      return this.chance(value)
     }
-    return value
+    return value.replace('$' + this.name, this.value).replace('${' + this.name + '}', this.value)
   }
 }
 

test/models/Variable.js

@@ -49,4 +49,16 @@ describe('Variable', function () {
       assert.strictEqual(v2.id, 'owner::name')
     })
   })
+
+  describe('#chance', function () {
+    it('creates random values with chance.js`', function () {
+      const v1 = new Variable('==CHANCE=JS==', '', '')
+      // eslint-disable-next-line no-template-curly-in-string
+      assert.strictEqual(v1.chance('My magic number is ${chance.integer({min: 7, max: 7})}'), 'My magic number is 7')
+      // eslint-disable-next-line no-template-curly-in-string
+      assert.strictEqual(v1.chance('${chance.character({pool: "b"})}'), 'b')
+      // eslint-disable-next-line no-template-curly-in-string
+      assert(['false', 'null', 'undefined', '0', 'NaN', ''].includes(v1.chance('${chance.falsy()}')))
+    })
+  })
 })