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前言： 因为来实现Freescale环境在Arduino IDE的实现，需要对源代码的进行分析。在使用IDE的使用过程中，我们发现如果直接在Editor中include库的话，编译器将无视，所以必须点击工具栏的Sketch->Import Library才能成功include所需要的库。
分析： IDE的源代码在arduino-1.0.X/app/src/processing/app中。很容易找到关于Sketch的.java文件。 寻找到引入库的函数importLibrary,如下:    public void importLibrary(String jarPath) {   // make sure the user didn't hide the sketch folder   ensureExistence();
  String list[] = Compiler.headerListFromIncludePath(jarPath);
  // import statements into the main sketch file (code[0])   // if the current code is a .java file, insert into current   //if (current.flavor == PDE) {   if (hasDefaultExtension(current)) {    setCurrentCode(0);   }   // could also scan the text in the file to see if each import   // statement is already in there, but if the user has the import   // commented out, then this will be a problem.   StringBuffer buffer = new StringBuffer();   for (int i = 0; i < list.length; i++) {    buffer.append("#include <");    buffer.append(list[i]);    buffer.append(">\n");   }   buffer.append('\n');   buffer.append(editor.getText());   editor.setText(buffer.toString());   editor.setSelection(0, 0);  // scroll to start   setModified(true);  }
可见ide将库的路径添加到Compiler.headerListFromIncludePath中，然后在Editor中写入"#include ". 然后找到Compiler文件（位于arduino-1.0.X/app/src/processing/app/debug）Compiler.java中headerListFromIncludePath()函数，如下：
   static public String[] headerListFromIncludePath(String path) {   FilenameFilter onlyHFiles = new FilenameFilter() {    public boolean accept(File dir, String name) {     return name.endsWith(".h");    }   };       return (new File(path)).list(onlyHFiles);  }
 static public ArrayList findFilesInPath(String path, String extension,                         boolean recurse) {   return findFilesInFolder(new File(path), extension, recurse);  }     static public ArrayList findFilesInFolder(File folder, String extension,                          boolean recurse) {   ArrayList files = new ArrayList();       if (folder.listFiles() == null) return files;       for (File file : folder.listFiles()) {    if (file.getName().startsWith(".")) continue; // skip hidden files         if (file.getName().endsWith("." + extension))     files.add(file);          if (recurse && file.isDirectory()) {     files.addAll(findFilesInFolder(file, extension, true));    }   }       return files;  } } 以下函数选择板子： String avrBasePath = Base.getAvrBasePath();   Map boardPreferences = Base.getBoardPreferences();   String core = boardPreferences.get("build.core");   if (core == null) {   RunnerException re = new RunnerException(_("No board selected; please choose a board from the Tools > Board menu."));    re.hideStackTrace();    throw re;   }   String corePath; 最后编译选配置为“-I”：
for (int i = 0; i < includePaths.size(); i++) {    baseCommandCompiler.add("-I" + (String) includePaths.get(i));    }