Add attribute information table so we generate correct setters.

build/gen_html_setters.dart

+// Copyright (c) 2012, 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.
+
+import 'dart:io';
+
+// TODO(jmesserly): should be importing a compiler mirrors package.
+// This is currently generated by the shell script.
+import 'compile_mirrors.dart';
+
+// TODO(jmesserly): pub is not creating a "packages" for us.
+import '../lib/src/html5_utils.dart' show htmlElementNames;
+
+const MY_NAME = 'build/gen_html_setters.sh';
+const OUTPUT_NAME = 'lib/src/html5_setters.g.dart';
+
+/**
+ * Given a field name in `dart:html` gets the HTML attribute name.
+ */
+const fieldToAttribute = const {
+  'acceptCharset': 'accept-charset',
+  'defaultValue': 'default',
+  // Yuck. http://dartbug.com/4550
+  'webkitdropzone': 'dropzone',
+  'htmlFor': 'for',
+  'httpEquiv': 'http-equiv',
+};
+
+
+main() {
+  print('''
+This script uses compile time mirrors to get information from dart:html.
+The information is used to create "$OUTPUT_NAME".
+''');
+
+  var sdk = Platform.environment['DART_SDK'];
+  if (sdk == null) {
+    print('DART_SDK path must be set. Use gen_html_setters.sh.');
+    exit(1);
+  }
+
+  var htmlPath = new Path('dart:html');
+  var libPath = new Path(sdk).append('lib');
+  var pkgPath = new Path(sdk).append('pkg');
+
+  var mirrors = new Compilation.library([htmlPath], libPath, pkgPath).mirrors;
+  var html = mirrors.libraries['html'];
+
+
+  var extendsCode = new StringBuffer();
+  extendsCode.add('var htmlElementExtends = const {\n');
+
+  var code = new StringBuffer();
+  code.add('// This file is autogenerated by $MY_NAME. Do not edit.\n');
+  code.add('library html5_setters;\n');
+
+  var elemSet = new Set();
+  void addSuperInterfaces(ClassMirror cls) {
+    var name = cls.displayName;
+    if (name.endsWith('Element') && !elemSet.contains(name)) {
+      elemSet.add(name);
+      cls.superinterfaces.forEach(addSuperInterfaces);
+    }
+  }
+  for (var name in htmlElementNames.values) {
+    addSuperInterfaces(html.classes[name]);
+  }
+  addSuperInterfaces(html.classes['UnknownElement']);
+
+  code.add('var htmlElementFields = const {\n');
+  var elements = new List.from(elemSet);
+  elements.sort();
+  for (var element in elements) {
+    var cls = html.classes[element];
+    var setters = [];
+
+    var interfaces = cls.superinterfaces.filter(
+        (i) => i.displayName.endsWith('Element'));
+
+    if (interfaces.length > 1) {
+      print('ERROR: $element has more than one Element superinterface:\n'
+          '    $interfaces');
+      exit(2);
+    } else if (interfaces.length > 0) {
+      extendsCode.add("  '$element': '${interfaces[0].displayName}',\n");
+    }
+
+    // TODO(jmesserly): using "cls.setters" does not seem to work
+    for (var member in cls.members.values) {
+      if (member.simpleName.startsWith(r'$')) continue;
+      if (member is! VariableMirror) continue;
+      if (member.isFinal || member.isConst) continue;
+      setters.add(member.displayName);
+    }
+
+    if (setters.length == 0) continue;
+
+    code.add("  '$element': const {\n");
+    for (var setter in setters) {
+      var attr = fieldToAttribute[setter];
+      if (attr == null) attr = setter.toLowerCase();
+      code.add("    '$attr': '$setter',\n");
+    }
+    code.add('  },\n');
+  }
+  code.add('};\n\n');
+  extendsCode.add('};\n');
+  code.add(extendsCode.toString());
+
+  var outPath = new Path(new Options().script).directoryPath
+      .append('..').append(OUTPUT_NAME);
+
+  new File.fromPath(outPath)
+      .openSync(FileMode.WRITE)
+      ..writeStringSync(code.toString())
+      ..closeSync();
+
+  print('Wrote $outPath.');
+}