Generate useful toString() methods for summary classes.

pkg/analyzer/tool/summary/generate.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * This file contains code to generate serialization/deserialization logic for
  * summaries based on an "IDL" description of the summary format (written in
  * stylized Dart).
  *
  * For each class in the "IDL" input, two corresponding classes are generated:
@@ skipping 44 matching lines @@
   Scanner scanner = new Scanner(idlSource, idlReader, errorListener);
   Token tokenStream = scanner.tokenize();
   LineInfo lineInfo = new LineInfo(scanner.lineStarts);
   Parser parser = new Parser(idlSource, new BooleanErrorListener());
   CompilationUnit idlParsed = parser.parseCompilationUnit(tokenStream);
   _CodeGenerator codeGenerator = new _CodeGenerator();
   codeGenerator.processCompilationUnit(lineInfo, idlParsed);
   return codeGenerator._outBuffer.toString();
 });
 
+typedef String _StringToString(String s);
+
 class _CodeGenerator {
   /**
    * Buffer in which generated code is accumulated.
    */
   final StringBuffer _outBuffer = new StringBuffer();
 
   /**
    * Current indentation level.
    */
   String _indentation = '';
@@ skipping 259 matching lines @@
     out('// for details. All rights reserved. Use of this source code is governed by a');
     out('// BSD-style license that can be found in the LICENSE file.');
     out('//');
     out('// This file has been automatically generated.  Please do not edit it manually.');
     out('// To regenerate the file, use the script "pkg/analyzer/tool/generate_files".');
     out();
     out('library analyzer.src.summary.format;');
     out();
     out("import 'flat_buffers.dart' as fb;");
     out("import 'idl.dart' as idl;");
+    out("import 'dart:convert' as convert;");
     out();
     for (idlModel.EnumDeclaration enm in _idl.enums.values) {
       _generateEnumReader(enm);
       out();
     }
     for (idlModel.ClassDeclaration cls in _idl.classes.values) {
       _generateBuilder(cls);
       out();
       if (cls.isTopLevel) {
         _generateReadFunction(cls);
@@ skipping 270 matching lines @@
       }
     });
     out('}');
   }
 
   void _generateMixin(idlModel.ClassDeclaration cls) {
     String name = cls.name;
     String mixinName = '_${name}Mixin';
     out('abstract class $mixinName implements ${idlPrefix(name)} {');
     indent(() {
+      // Write toJson().
+      out('@override');
+      out('Map<String, Object> toJson() {');
+      indent(() {
+        out('Map<String, Object> _result = <String, Object>{};');
+        for (idlModel.FieldDeclaration field in cls.fields) {
+          String condition;
+          if (field.type.isList) {
+            condition = '${field.name}.isNotEmpty';
+          } else {
+            condition = '${field.name} != ${defaultValue(field.type, false)}';
+          }
+          _StringToString convertItem;
+          if (_idl.classes.containsKey(field.type.typeName)) {
+            convertItem = (String name) => '$name.toJson()';
+          } else if (_idl.enums.containsKey(field.type.typeName)) {
+            // TODO(paulberry): it would be better to generate a const list of
+            // strings so that we don't have to do this kludge.
+            convertItem = (String name) => "$name.toString().split('.')[1]";
+          } else if (field.type.typeName == 'double') {
+            convertItem =
+                (String name) => '$name.isFinite ? $name : $name.toString()';
+          }
+          String convertField;
+          if (convertItem == null) {
+            convertField = field.name;
+          } else if (field.type.isList) {
+            convertField = '${field.name}.map((_value) =>'
+                ' ${convertItem('_value')}).toList()';
+          } else {
+            convertField = convertItem(field.name);
+          }
+          String storeField = '_result[${quoted(field.name)}] = $convertField';
+          out('if ($condition) $storeField;');
+        }
+        out('return _result;');
+      });
+      out('}');
+      out();
       // Write toMap().
       out('@override');
       out('Map<String, Object> toMap() => {');
       indent(() {
         for (idlModel.FieldDeclaration field in cls.fields) {
           String fieldName = field.name;
           out('${quoted(fieldName)}: $fieldName,');
         }
       });
       out('};');
+      out();
+      // Write toString().
+      out('@override');
+      out('String toString() => convert.JSON.encode(toJson());');
     });
     out('}');
   }
 
   void _generateReader(idlModel.ClassDeclaration cls) {
     String name = cls.name;
     String readerName = '_${name}Reader';
     String implName = '_${name}Impl';
     out('class $readerName extends fb.TableReader<$implName> {');
     indent(() {
@@ skipping 31 matching lines @@
       return token.lexeme.split('\n').map((String line) {
         if (line.startsWith(indent)) {
           line = line.substring(indent.length);
         }
         return line;
       }).join('\n');
     }
     return null;
   }
 }