Analyze Dart scripts in HTML files.

editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/html/HtmlAnalyzeHelper.java

Index: editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/html/HtmlAnalyzeHelper.java
diff --git a/editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/html/HtmlAnalyzeHelper.java b/editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/html/HtmlAnalyzeHelper.java
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+++ b/editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/html/HtmlAnalyzeHelper.java
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+/*
+ * Copyright 2012 Dart project authors.
+ * 
+ * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ * 
+ * http://www.eclipse.org/legal/epl-v10.html
+ * 
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+package com.google.dart.tools.core.html;
+
+import com.google.common.base.CharMatcher;
+import com.google.common.base.Charsets;
+import com.google.common.collect.Maps;
+import com.google.common.io.Files;
+import com.google.dart.tools.core.DartCore;
+import com.google.dart.tools.core.analysis.AnalysisServer;
+import com.google.dart.tools.core.internal.model.PackageLibraryManagerProvider;
+
+import org.eclipse.core.resources.IFile;
+
+import java.io.File;
+import java.util.Map;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * Helper class to analyze Dart code inside of HTML files.
+ */
+public class HtmlAnalyzeHelper {
+  private static final Map<File, File> dartToHtmlMap = Maps.newConcurrentMap();
+
+  /**
+   * This method should be called from builder to notify that HTML file was changed and should be
+   * analyzed. Note that this is long operation, don't call it from UI thread.
+   */
+  public static void analyze(IFile htmlResource) {
+    File htmlFile = htmlResource.getLocation().toFile();
+    try {
+      analyzeEx(htmlFile);
+    } catch (Throwable e) {
+      DartCore.logError(e);
+    }
+  }
+
+  /**
+   * @return the HTML {@link File} from which given Dart {@link File} was generated, may be same
+   *         {@link File} if it was not generated from HTML.
+   */
+  public static File getSourceHtmlFile(File dartFile) {
+    File htmlFile = dartToHtmlMap.get(dartFile);
+    if (htmlFile != null) {
+      return htmlFile;
+    }
+    return dartFile;
+
+  }
+
+  /**
+   * Implementation of {@link #analyze(IFile)} which can throw exceptions.
+   */
+  private static void analyzeEx(File htmlFile) throws Exception {
+    String content = Files.toString(htmlFile, Charsets.UTF_8);
+    // extract <script type="application/dart"> scripts
+    int searchStart = 0;
+    Pattern pattern = Pattern.compile("\\<\\s*script\\s+type=['\"]application/dart['\"]\\s*\\>\\s*(.*)");
+    Matcher matcher = pattern.matcher(content);
+    while (true) {
+      // find next script
+      if (!matcher.find(searchStart)) {
+        break;
+      }
+      // prepare script start/end
+      int scriptStart = matcher.start(1);
+      int scriptEnd = content.indexOf("</script>", scriptStart);
+      if (scriptEnd == -1) {
+        break;
+      }
+      searchStart = scriptEnd;
+      // extract script
+      String script = content.substring(scriptStart, scriptEnd);
+      // prepare prefix to place script at the same line/offset as it was in HTML
+      String scriptPrefix;
+      {
+        String contentPrefix = content.substring(0, scriptStart);
+        scriptPrefix = CharMatcher.anyOf("\r\n").negate().replaceFrom(contentPrefix, ' ');
+      }
+      // create temporary File with Dart code
+      File scriptFile = File.createTempFile("dartInHtml", ".dart");
+      Files.write(scriptPrefix + script, scriptFile, Charsets.UTF_8);
+      dartToHtmlMap.put(scriptFile, htmlFile);
+      // ask AnalysisServer to analyze Dart file
+      {
+        AnalysisServer server = PackageLibraryManagerProvider.getDefaultAnalysisServer();
+        server.getSavedContext().resolve(scriptFile, 30 * 1000);
+        // clean up
+        scriptFile.delete();
+        // in theory, we should remove mapping, but practically it may be requested later
+//        dartToHtmlMap.remove(scriptFile);
+      }
+    }
+  }
+}