什么是“推动方法”和“拉动方法”来解析？ [英] What is 'Push Approach' and 'Pull Approach' to parsing?

问题描述

在推送解析方法下，推送解析器生成同步事件，因为文档是
解析的，并且这些事件可以由应用程序使用回调处理程序模型处理

Under the push parsing approach, a push parser generates synchronous events as a document is parsed, and these events can be processed by an application using a callback handler model

这是关于SAX 2.0的 Pro XML Development with Java 一书中给出的文字。

This is the text given in the book Pro XML Development with Java about SAX 2.0.

至于StAX，这本书说：

As for StAX, the book says:

在拉动方式下，使用解析器在应用程序
的控制下从XML文档中提取事件。

Under the pull approach, events are pulled from an XML document under the control of the application using the parser.

我想问一下，突出显示文本的含义是什么？一个适合初学者的答案是值得赞赏的：）

I want to ask, what is the meaning of the highlighted text ? An answer befitting a beginner is appreciated :)

推荐答案

基本上，推送就是解析器对某个处理程序说我有foo，用它做点什么。拉动是当处理程序对解析器说，给我下一个foo。

Basically, a push is when the parser says to some handler, "I have a foo, do something with it." A pull is when the handler says to the parser, "give me the next foo."

推送：

if (myChar == '(')
    handler.handleOpenParen(); // push the open paren to the handler

拉：

Token token = parser.next(); // pull the next token from the parser

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