added initial support for dialogflow

lib/tasks/dialogflow/transcription.js

@@ -0,0 +1,41 @@
+class Transcription {
+  constructor(logger, evt) {
+    this.logger = logger;
+
+    this.recognition_result = evt.recognition_result;
+  }
+
+  get isEmpty() {
+    return !this.recognition_result;
+  }
+
+  get isFinal() {
+    return this.recognition_result && this.recognition_result.is_final === true;
+  }
+
+  get confidence() {
+    if (!this.isEmpty) return this.recognition_result.confidence;
+  }
+
+  get text() {
+    if (!this.isEmpty) return this.recognition_result.transcript;
+  }
+
+  startsWith(str) {
+    return (this.text.toLowerCase() || '').startsWith(str.toLowerCase());
+  }
+
+  includes(str) {
+    return (this.text.toLowerCase() || '').includes(str.toLowerCase());
+  }
+
+  toJSON() {
+    return {
+      final: this.recognition_result.is_final === true,
+      text: this.text,
+      confidence: this.confidence
+    };
+  }
+}
+
+module.exports = Transcription;