Java Eclipse抽象语法树编程访问

您能否提供一个示例，以编程方式访问给定代码段的Eclipse抽象语法树

例如，获得以下方面的AST：

---

Class1.java }

这不是一个确切的答案，可能会给你一个起点：

如本文所述,

本文提供了一个完整的示例，更多详细信息请参见。在的幻灯片59中，您将看到如何对源代码应用更改

// get an ICompilationUnit by some means
// you might drill down from an IJavaProject, for instance 
ICompilationUnit iunit = ...

// create a new parser for the latest Java Language Spec
ASTParser parser = ASTParser.newParser(AST.JLS3);

// tell the parser you are going to pass it some code where the type level is a source file
// you might also just want to parse a block, or a method ("class body declaration"), etc
parser.setKind(ASTParser.K_COMPILATION_UNIT);

// set the source to be parsed to the ICompilationUnit
// we could also use a character array
parser.setSource(iunit);

// parse it.
// the output will be a CompilationUnit (also an ASTNode)
// the null is because we're not using a progress monitor
CompilationUnit unit = (CompilationUnit) parser.createAST(null);

不要被ICompilationUnit与CompliationUnit之间的区别所迷惑，这似乎只是他们没有创造性命名的结果。CompliationUnit是ASTNode的一种类型。此上下文中的ICompilationUnit类似于文件句柄。有关区别的更多信息，请参见此处：

// get an ICompilationUnit by some means
// you might drill down from an IJavaProject, for instance 
ICompilationUnit iunit = ...

// create a new parser for the latest Java Language Spec
ASTParser parser = ASTParser.newParser(AST.JLS3);

// tell the parser you are going to pass it some code where the type level is a source file
// you might also just want to parse a block, or a method ("class body declaration"), etc
parser.setKind(ASTParser.K_COMPILATION_UNIT);

// set the source to be parsed to the ICompilationUnit
// we could also use a character array
parser.setSource(iunit);

// parse it.
// the output will be a CompilationUnit (also an ASTNode)
// the null is because we're not using a progress monitor
CompilationUnit unit = (CompilationUnit) parser.createAST(null);