Add analysis server API specification and related tools.

pkg/analysis_server/spec/codegen_tools.dart

Index: pkg/analysis_server/spec/codegen_tools.dart
diff --git a/pkg/analysis_server/spec/codegen_tools.dart b/pkg/analysis_server/spec/codegen_tools.dart
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@@ -0,0 +1,272 @@
+// Copyright (c) 2014, 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.
+
+/**
+ * Tools for code generation.
+ */
+library CodegenTools;
+
+import 'package:html5lib/dom.dart' as dom;
+
+import 'text_formatter.dart';
+import 'html_tools.dart';
+
+/**
+ * Join the given strings using camelCase.  If [capitalize] is true, the first
+ * part will be capitalized as well.
+ */
+String camelJoin(List<String> parts, {bool capitalize: false}) {
+  List<String> upcasedParts = <String>[];
+  for (int i = 0; i < parts.length; i++) {
+    if (i == 0 && !capitalize) {
+      upcasedParts.add(parts[i]);
+    } else {
+      upcasedParts.add(parts[i][0].toUpperCase() + parts[i].substring(1));
+    }
+  }
+  return upcasedParts.join();
+}
+
+final RegExp trailingWhitespaceRegExp = new RegExp(r' +$', multiLine: true);
+
+/**
+ * Mixin class for generating code.
+ */
+class CodeGenerator {
+  _CodeGeneratorState _state;
+
+  /**
+   * Execute [callback], collecting any code that is output using [write]
+   * or [writeln], and return the result as a string.
+   */
+  String collectCode(void callback()) {
+    _CodeGeneratorState oldState = _state;
+    try {
+      _state = new _CodeGeneratorState();
+      callback();
+      return _state.buffer.toString().replaceAll(trailingWhitespaceRegExp, '');
+    } finally {
+      _state = oldState;
+    }
+  }
+
+  /**
+   * Output text without ending the current line.
+   */
+  void write(Object obj) {
+    _state.write(obj.toString());
+  }
+
+  /**
+   * Output text, ending the current line.
+   */
+  void writeln([Object obj = '']) {
+    _state.write('$obj\n');
+  }
+
+  /**
+   * Execute [callback], indenting any code it outputs by two spaces.
+   */
+  void indent(void callback()) => indentSpecial('  ', '  ', callback);
+
+  /**
+   * Execute [callback], using [additionalIndent] to indent any code it outputs.
+   */
+  void indentBy(String additionalIndent, void callback()) => indentSpecial(
+      additionalIndent, additionalIndent, callback);
+
+  /**
+   * Execute [callback], using [additionalIndent] to indent any code it outputs.
+   * The first line of output is indented by [firstAdditionalIndent] instead of
+   * [additionalIndent].
+   */
+  void indentSpecial(String firstAdditionalIndent, String additionalIndent, void
+      callback()) {
+    String oldNextIndent = _state.nextIndent;
+    String oldIndent = _state.indent;
+    try {
+      _state.nextIndent += firstAdditionalIndent;
+      _state.indent += additionalIndent;
+      callback();
+    } finally {
+      _state.nextIndent = oldNextIndent;
+      _state.indent = oldIndent;
+    }
+  }
+
+  /**
+   * Measure the width of the current indentation level.
+   */
+  int get indentWidth => _state.nextIndent.length;
+
+  /**
+   * Generate a doc comment based on the HTML in [docs].
+   *
+   * If [javadocStyle] is true, then the output is compatable with Javadoc,
+   * which understands certain HTML constructs.
+   */
+  void docComment(List<dom.Node> docs, bool javadocStyle) {
+    writeln('/**');
+    indentBy(' * ', () {
+      write(nodesToText(docs, 79 - _state.indent.length, javadocStyle));
+    });
+    writeln(' */');
+  }
+
+  void outputHeader() {
+    String header =
+        '''
+// Copyright (c) 2014, 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 has been automatically generated.  Please do not edit it manually.
+// To regenerate the file, use the script
+// "pkg/analysis_server/spec/generate_files".
+''';
+    writeln(header.trim());
+    writeln();
+  }
+}
+
+/**
+ * State used by [CodeGenerator].
+ */
+class _CodeGeneratorState {
+  StringBuffer buffer = new StringBuffer();
+  String nextIndent = '';
+  String indent = '';
+  bool indentNeeded = true;
+
+  void write(String text) {
+    List<String> lines = text.split('\n');
+    for (int i = 0; i < lines.length; i++) {
+      if (i == lines.length - 1 && lines[i].isEmpty) {
+        break;
+      }
+      if (indentNeeded) {
+        buffer.write(nextIndent);
+        nextIndent = indent;
+      }
+      indentNeeded = false;
+      buffer.write(lines[i]);
+      if (i != lines.length - 1) {
+        buffer.writeln();
+        indentNeeded = true;
+      }
+    }
+  }
+}
+
+/**
+ * Mixin class for generating HTML representations of code that are suitable
+ * for enclosing inside a <pre> element.
+ */
+abstract class HtmlCodeGenerator {
+  _HtmlCodeGeneratorState _state;
+
+  /**
+   * Execute [callback], collecting any code that is output using [write],
+   * [writeln], [add], or [addAll], and return the result as a list of DOM
+   * nodes.
+   */
+  List<dom.Node> collectHtml(void callback()) {
+    _HtmlCodeGeneratorState oldState = _state;
+    try {
+      _state = new _HtmlCodeGeneratorState();
+      if (callback != null) {
+        callback();
+      }
+      return _state.buffer;
+    } finally {
+      _state = oldState;
+    }
+  }
+
+  /**
+   * Add the given [node] to the HTML output.
+   */
+  void add(dom.Node node) {
+    _state.add(node);
+  }
+
+  /**
+   * Add the given [nodes] to the HTML output.
+   */
+  void addAll(Iterable<dom.Node> nodes) {
+    for (dom.Node node in nodes) {
+      _state.add(node);
+    }
+  }
+
+  /**
+   * Output text without ending the current line.
+   */
+  void write(Object obj) {
+    _state.write(obj.toString());
+  }
+
+  /**
+   * Output text, ending the current line.
+   */
+  void writeln([Object obj = '']) {
+    _state.write('$obj\n');
+  }
+
+  /**
+   * Execute [callback], indenting any code it outputs by two spaces.
+   */
+  void indent(void callback()) {
+    String oldIndent = _state.indent;
+    try {
+      _state.indent += '  ';
+      callback();
+    } finally {
+      _state.indent = oldIndent;
+    }
+  }
+
+  /**
+   * Execute [callback], wrapping its output in an element with the given
+   * [name] and [attributes].
+   */
+  void element(String name, Map<String, String> attributes, [void callback()]) {
+    add(makeElement(name, attributes, collectHtml(callback)));
+  }
+}
+
+/**
+ * State used by [HtmlCodeGenerator].
+ */
+class _HtmlCodeGeneratorState {
+  List<dom.Node> buffer = <dom.Node>[];
+  String indent = '';
+  bool indentNeeded = true;
+
+  void add(dom.Node node) {
+    if (node is dom.Text) {
+      write(node.text);
+    } else {
+      buffer.add(node);
+    }
+  }
+
+  void write(String text) {
+    if (text.isEmpty) {
+      return;
+    }
+    if (indentNeeded) {
+      buffer.add(new dom.Text(indent));
+    }
+    List<String> lines = text.split('\n');
+    if (lines.last.isEmpty) {
+      lines.removeLast();
+      buffer.add(new dom.Text(lines.join('\n$indent') + '\n'));
+      indentNeeded = true;
+    } else {
+      buffer.add(new dom.Text(lines.join('\n$indent')));
+      indentNeeded = false;
+    }
+  }
+}