So when you want to rename a method or class, it's easy for the environment to find every use of it by pinpointing the location in the AST.
因此，当需要重新命名一个方法或者类的时候，开发环境很容易通过在 AST 中精确定位找到方法或类被引用的每个地方。
Or to use the appropriate terminology, how a parser can produce a custom element... in this case our AST objects.
用适当的术语来说就是解析器如何才能产生一个定制的元素(在这里，就是AST对象)。
The analysis API eliminates most of the challenges associated with visiting AST nodes by providing a common visitor class and abstracting the query mechanism.
分析API通过提供一个公用的访问者类和抽象查询机制，消除了和访问AST节点相关联的大部分挑战。
The AST is a tree representation of the source code that contains everything from variable declarations to function definitions and method invocations.
AST是源代码的树形表示，它包含了从变量声明到功能定义和方法调用的全部内容。
Remember that the AST classes aren't visible outside of this package at all and that clients will (eventually) simply pass in a String representation of the expression they want evaluated.
要记住AST类在包外是不可见的， 还有就是客户机（最终）只会传入它们想求值的表达式的一个字符串表示。
To see more clearly, this distinction of when you would use a scanner vs. an AST, consider the code in Listing 10.
要更清晰地了解何时使用扫描程序与何时使用AST 之间的差别，请考虑清单 10中的代码。
This line visits the AST tree, starting at the compilation unit (the top-most node), and queries for a list of all method declarations.
这一行访问ast树，起步于编辑单元(最顶层的节点)，并且查询所有的方法声明。
Now comes the other half of building a DSL: We need to build a segment of code that can take some kind of textual input and turn it into an AST.
现在是构建DSL的另一半工作：我们需要构建一段代码，它可以接收某种文本输入并将其转换成一个AST。
And with just 1, 000 people registered - down from the 1, 400 organizers said were in attendance ast year - the halls and meetings rooms had a quiet air of waiting.
会议组织者说：“今年注册登记的只有1 000人，而去年则有1 400人。”大厅走廊和会议室今年都冷清了好多。
The rule that we previously examined is about as simple as a rule can get. It queries for only a single type of node in the AST tree and blindly reports all results remaining after filter.
我们前面所介绍的规则是最简单的一种了，它只查询ast树中一种类型的节点，并且盲目地报告所有结果。
L ast week, I went to a dinner party that gave me a bout of indigestion.
上周我去参加了一个晚宴，结果害得我消化不良。
The AST is a tree representation of the parsed source code, created by the compiler, similar to the DOM tree model of an XML file.
AST代表已解析源代码的树，它由编译器创建，与XML 文件的DOM 树模型类似。
First, you have to consider whether a change to the AST needs to be made.
首先，您必须考虑是否需要更改ast。
This function displays an AST with a couple of conventions.
该函数将显示一个带有几个约定的AST。
In IDEA and Eclipse, your code looks like a text view, but the development environment is actually editing the Abstract Syntax Tree (AST).
在idea和eclipse中，您的代码看上去像一个文本视图，但是开发环境实际上正在编辑AbstractSyntaxTree (ast)。
Running the tests reveals that the results of the parser aren't yet in the AST types I created earlier (expr and its kin), but instead in a form consisting of Lists and Strings and such.
运行测试表明，解析器的结果仍不是我前面创建的AST类型(expr和它的亲属)，而是由List和String等组成的一种形式。
Tools, based on ParseTree, already exist, such as Ruby2Ruby which can turn an AST back into Ruby source code; useful if a tool wants to modify an AST and then output it as Ruby source.
已有的基于分析树的工具，比如Ruby2Ruby可以把AST转换成Ruby源代码；如果某工具想修改AST并输出为Ruby源代码，这很有用。
A lack of a pure Ruby parser has been negligible for some time in Ruby's history, since getting the Abstract Syntax Tree (AST) of some Ruby code was possible with utilities such as ParseTree.
因为可以使用类似语法分析树(ParseTree)的通用方法来对Ruby代码进行分析并获得抽象语法树(Abstract Syntax Tree)，所以在Ruby历史上的一定时期内，纯ruby语法分析器的缺失被忽视了。
Because you have defined this extension to be invoked when the transformation is processing a UML class, you can safely type the target object to an Abstract Syntax Tree (AST) TypeDeclaration object.
因为当转换处理UM l类时，您已经定义调用该扩展，所以您可以安全地向AbstractSyntaxTree (ast)TypeDeclaration对象输入目标对象。
The JRuby AST is the output of the parser and is just a tree representation of the source code, containing different kinds of nodes, for example for classes, methods, variables.
JRubyAST是解析器的输出结果，仅仅是源代码的树形表示，包含不同种类的节点，例如有类、方法和变量。
Before getting too deep into the AST definition, let me provide a quick overview of what case classes are.
在深入到AST定义之前，让我先简要概述一下什么是case类。
An annotation handler is a class that implements a couple of Lombok interfaces and the AST transformation logic - aka code generation.
注释处理程序是实现一对Lombok接口以及转换逻辑的类—aka代码生成。
An AST is a tree representation of source code, and is necessary for tools that need to know about the structure of the code.
AST是一颗代表Ruby源码的树，分析器工具必须了解代码的结构。
The AST contains a single IASTDeclarationUnit that represents the main function.
AST包含了代表main函数的单个的IASTDeclarationUnit。
Let's take a look at the AST generated in the above examples.
让我们来看看上面示例中生成的ast。
The pure Ruby parser now offers a chance to change that - a Ruby IDE or other tool, can now get at a Ruby AST without getting locked in.
纯ruby语法分析器提供了改变这种情况的机会——Ruby IDE(或者其他工具)可以获得Ruby的抽象语法树，同时避免被绑定到特定的语法分析器实现上。
Next, we need an evaluation function that will take the AST and evaluate it to a numerical value. This is pretty straightforward to write, given the power of pattern matching.
接下来，我们需要一个求值函数，它将会获取AST，并求出它的数字值。
In my code the evaluation is performed by each AST node itself, but we may use also a tree walker to walk each node and execute it based on its type.
在我的代码中，计算由每个AST结点自己执行，但我们可能也将使用一个树遍历器来遍历每个结点，基于它的类型来执行。
They collect ast amounts of sequence fragments, which contain genetic information of thousands of species forming communities that colonise a certain habitat.
他们收集了海量的序列片段，其中包括数千种来源于具有拓殖特定栖息地的生物群体的遗传信息。
It was so that they could have a "look"that the six blindmen asked the driver to stop the be ast.
六个盲人要求赶象人让这头巨兽停下来，以便他们能“看一看”。 可强调为。
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