org.htmlparser.scanners

类 CompositeTagScanner

java.lang.Object

org.htmlparser.scanners.TagScanner

org.htmlparser.scanners.CompositeTagScanner

所有已实现的接口:

java.io.Serializable, Scanner

直接已知子类:

CompositeTagScannerTest.AnotherScanner, CompositeTagScannerTest.CustomScanner, ScriptScanner, StyleScanner

public class CompositeTagScanner
extends TagScanner

The main scanning logic for nested tags. When asked to scan, this class gathers nodes into a heirarchy of tags.

另请参阅:

序列化表格

构造器概要

构造器

构造器和说明
CompositeTagScanner() Create a composite tag scanner.

方法概要

限定符和类型	方法和说明
boolean	isTagToBeEndedFor(Tag current, Tag tag) Determine if the current tag should be terminated by the given tag.
Tag	scan(Tag tag, Lexer lexer, NodeList stack) Collect the children.

从类继承的方法 java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

CompositeTagScanner

public CompositeTagScanner()

Create a composite tag scanner.

方法详细资料

scan

public Tag scan(Tag tag,
                Lexer lexer,
                NodeList stack)
         throws ParserException

Collect the children.

An initial test is performed for an empty XML tag, in which case the start tag and end tag of the returned tag are the same and it has no children.

If it's not an empty XML tag, the lexer is repeatedly asked for subsequent nodes until an end tag is found or a node is encountered that matches the tag ender set or end tag ender set. In the latter case, a virtual end tag is created. Each node found that is not the end tag is added to the list of children. The end tag is special and not a child.

Nodes that also have a CompositeTagScanner as their scanner are recursed into, which provides the nested structure of an HTML page. This method operates in two possible modes, depending on a private boolean. It can recurse on the JVM stack, which has caused some overflow problems in the past, or it can use the supplied stack argument to nest scanning of child tags within itself. The former is left as an option in the code, mostly to help subsequent modifiers visualize what the internal nesting is doing.

指定者:

scan 在接口中 Scanner

覆盖:

scan 在类中 TagScanner

参数:

tag - The tag this scanner is responsible for.

lexer - The source of subsequent nodes.

stack - The parse stack. May contain pending tags that enclose this tag.

返回:

The resultant tag (may be unchanged).

抛出:

ParserException - if an unrecoverable problem occurs.

isTagToBeEndedFor

public final boolean isTagToBeEndedFor(Tag current,
                                       Tag tag)

Determine if the current tag should be terminated by the given tag. Examines the 'enders' or 'end tag enders' lists of the current tag for a match with the given tag. Which list is chosen depends on whether tag is an end tag ('end tag enders') or not ('enders').

参数:

current - The tag that might need to be ended.

tag - The candidate tag that might end the current one.

返回:

true if the name of the given tag is a member of the appropriate list.