Flutter Config toJson/fromJson (#1893)

flutter/sherpa_onnx/lib/src/online_recognizer.dart

@@ -16,11 +16,25 @@ class OnlineTransducerModelConfig {
     this.joiner = '',
   });
 
+  factory OnlineTransducerModelConfig.fromJson(Map<String, dynamic> json) {
+    return OnlineTransducerModelConfig(
+      encoder: json['encoder'] as String? ?? '',
+      decoder: json['decoder'] as String? ?? '',
+      joiner: json['joiner'] as String? ?? '',
+    );
+  }
+
   @override
   String toString() {
     return 'OnlineTransducerModelConfig(encoder: $encoder, decoder: $decoder, joiner: $joiner)';
   }
 
+  Map<String, dynamic> toJson() => {
+        'encoder': encoder,
+        'decoder': decoder,
+        'joiner': joiner,
+      };
+
   final String encoder;
   final String decoder;
   final String joiner;
@@ -29,11 +43,23 @@ class OnlineTransducerModelConfig {
 class OnlineParaformerModelConfig {
   const OnlineParaformerModelConfig({this.encoder = '', this.decoder = ''});
 
+  factory OnlineParaformerModelConfig.fromJson(Map<String, dynamic> json) {
+    return OnlineParaformerModelConfig(
+      encoder: json['encoder'] as String? ?? '',
+      decoder: json['decoder'] as String? ?? '',
+    );
+  }
+
   @override
   String toString() {
     return 'OnlineParaformerModelConfig(encoder: $encoder, decoder: $decoder)';
   }
 
+  Map<String, dynamic> toJson() => {
+        'encoder': encoder,
+        'decoder': decoder,
+      };
+
   final String encoder;
   final String decoder;
 }
@@ -41,11 +67,21 @@ class OnlineParaformerModelConfig {
 class OnlineZipformer2CtcModelConfig {
   const OnlineZipformer2CtcModelConfig({this.model = ''});
 
+  factory OnlineZipformer2CtcModelConfig.fromJson(Map<String, dynamic> json) {
+    return OnlineZipformer2CtcModelConfig(
+      model: json['model'] as String? ?? '',
+    );
+  }
+
   @override
   String toString() {
     return 'OnlineZipformer2CtcModelConfig(model: $model)';
   }
 
+  Map<String, dynamic> toJson() => {
+        'model': model,
+      };
+
   final String model;
 }
 
@@ -63,11 +99,42 @@ class OnlineModelConfig {
     this.bpeVocab = '',
   });
 
+  factory OnlineModelConfig.fromJson(Map<String, dynamic> json) {
+    return OnlineModelConfig(
+      transducer: OnlineTransducerModelConfig.fromJson(
+          json['transducer'] as Map<String, dynamic>? ?? const {}),
+      paraformer: OnlineParaformerModelConfig.fromJson(
+          json['paraformer'] as Map<String, dynamic>? ?? const {}),
+      zipformer2Ctc: OnlineZipformer2CtcModelConfig.fromJson(
+          json['zipformer2Ctc'] as Map<String, dynamic>? ?? const {}),
+      tokens: json['tokens'] as String,
+      numThreads: json['numThreads'] as int? ?? 1,
+      provider: json['provider'] as String? ?? 'cpu',
+      debug: json['debug'] as bool? ?? true,
+      modelType: json['modelType'] as String? ?? '',
+      modelingUnit: json['modelingUnit'] as String? ?? '',
+      bpeVocab: json['bpeVocab'] as String? ?? '',
+    );
+  }
+
   @override
   String toString() {
     return 'OnlineModelConfig(transducer: $transducer, paraformer: $paraformer, zipformer2Ctc: $zipformer2Ctc, tokens: $tokens, numThreads: $numThreads, provider: $provider, debug: $debug, modelType: $modelType, modelingUnit: $modelingUnit, bpeVocab: $bpeVocab)';
   }
 
+  Map<String, dynamic> toJson() => {
+        'transducer': transducer.toJson(),
+        'paraformer': paraformer.toJson(),
+        'zipformer2Ctc': zipformer2Ctc.toJson(),
+        'tokens': tokens,
+        'numThreads': numThreads,
+        'provider': provider,
+        'debug': debug,
+        'modelType': modelType,
+        'modelingUnit': modelingUnit,
+        'bpeVocab': bpeVocab,
+      };
+
   final OnlineTransducerModelConfig transducer;
   final OnlineParaformerModelConfig paraformer;
   final OnlineZipformer2CtcModelConfig zipformer2Ctc;
@@ -90,11 +157,23 @@ class OnlineModelConfig {
 class OnlineCtcFstDecoderConfig {
   const OnlineCtcFstDecoderConfig({this.graph = '', this.maxActive = 3000});
 
+  factory OnlineCtcFstDecoderConfig.fromJson(Map<String, dynamic> json) {
+    return OnlineCtcFstDecoderConfig(
+      graph: json['graph'] as String? ?? '',
+      maxActive: json['maxActive'] as int? ?? 3000,
+    );
+  }
+
   @override
   String toString() {
     return 'OnlineCtcFstDecoderConfig(graph: $graph, maxActive: $maxActive)';
   }
 
+  Map<String, dynamic> toJson() => {
+        'graph': graph,
+        'maxActive': maxActive,
+      };
+
   final String graph;
   final int maxActive;
 }
@@ -117,11 +196,52 @@ class OnlineRecognizerConfig {
     this.blankPenalty = 0.0,
   });
 
+  factory OnlineRecognizerConfig.fromJson(Map<String, dynamic> json) {
+    return OnlineRecognizerConfig(
+      feat: FeatureConfig.fromJson(
+          json['feat'] as Map<String, dynamic>? ?? const {}),
+      model: OnlineModelConfig.fromJson(json['model'] as Map<String, dynamic>),
+      decodingMethod: json['decodingMethod'] as String? ?? 'greedy_search',
+      maxActivePaths: json['maxActivePaths'] as int? ?? 4,
+      enableEndpoint: json['enableEndpoint'] as bool? ?? true,
+      rule1MinTrailingSilence:
+          (json['rule1MinTrailingSilence'] as num?)?.toDouble() ?? 2.4,
+      rule2MinTrailingSilence:
+          (json['rule2MinTrailingSilence'] as num?)?.toDouble() ?? 1.2,
+      rule3MinUtteranceLength:
+          (json['rule3MinUtteranceLength'] as num?)?.toDouble() ?? 20.0,
+      hotwordsFile: json['hotwordsFile'] as String? ?? '',
+      hotwordsScore: (json['hotwordsScore'] as num?)?.toDouble() ?? 1.5,
+      ctcFstDecoderConfig: OnlineCtcFstDecoderConfig.fromJson(
+          json['ctcFstDecoderConfig'] as Map<String, dynamic>? ?? const {}),
+      ruleFsts: json['ruleFsts'] as String? ?? '',
+      ruleFars: json['ruleFars'] as String? ?? '',
+      blankPenalty: (json['blankPenalty'] as num?)?.toDouble() ?? 0.0,
+    );
+  }
+
   @override
   String toString() {
     return 'OnlineRecognizerConfig(feat: $feat, model: $model, decodingMethod: $decodingMethod, maxActivePaths: $maxActivePaths, enableEndpoint: $enableEndpoint, rule1MinTrailingSilence: $rule1MinTrailingSilence, rule2MinTrailingSilence: $rule2MinTrailingSilence, rule3MinUtteranceLength: $rule3MinUtteranceLength, hotwordsFile: $hotwordsFile, hotwordsScore: $hotwordsScore, ctcFstDecoderConfig: $ctcFstDecoderConfig, ruleFsts: $ruleFsts, ruleFars: $ruleFars, blankPenalty: $blankPenalty)';
   }
 
+  Map<String, dynamic> toJson() => {
+        'feat': feat.toJson(),
+        'model': model.toJson(),
+        'decodingMethod': decodingMethod,
+        'maxActivePaths': maxActivePaths,
+        'enableEndpoint': enableEndpoint,
+        'rule1MinTrailingSilence': rule1MinTrailingSilence,
+        'rule2MinTrailingSilence': rule2MinTrailingSilence,
+        'rule3MinUtteranceLength': rule3MinUtteranceLength,
+        'hotwordsFile': hotwordsFile,
+        'hotwordsScore': hotwordsScore,
+        'ctcFstDecoderConfig': ctcFstDecoderConfig.toJson(),
+        'ruleFsts': ruleFsts,
+        'ruleFars': ruleFars,
+        'blankPenalty': blankPenalty,
+      };
+
   final FeatureConfig feat;
   final OnlineModelConfig model;
   final String decodingMethod;
@@ -151,11 +271,27 @@ class OnlineRecognizerResult {
   OnlineRecognizerResult(
       {required this.text, required this.tokens, required this.timestamps});
 
+  factory OnlineRecognizerResult.fromJson(Map<String, dynamic> json) {
+    return OnlineRecognizerResult(
+      text: json['text'] as String,
+      tokens: List<String>.from(json['tokens'] as List),
+      timestamps: (json['timestamps'] as List)
+          .map<double>((e) => (e as num).toDouble())
+          .toList(),
+    );
+  }
+
   @override
   String toString() {
     return 'OnlineRecognizerResult(text: $text, tokens: $tokens, timestamps: $timestamps)';
   }
 
+  Map<String, dynamic> toJson() => {
+        'text': text,
+        'tokens': tokens,
+        'timestamps': timestamps,
+      };
+
   final String text;
   final List<String> tokens;
   final List<double> timestamps;