Package org.jline.reader.impl

Class DefaultExpander

java.lang.Object

org.jline.reader.impl.DefaultExpander

All Implemented Interfaces:

Expander

public class DefaultExpander
extends Object
implements Expander

Default implementation of the Expander interface.

This expander provides functionality for expanding special syntax in command lines, including:

• History expansions (e.g., !!, !$, !n, etc.)
• Variable expansions (e.g., $HOME, ${PATH})

The history expansion syntax is similar to that used in Bash and other shells, allowing users to reference and reuse previous commands or parts of commands.

The expander is used by the LineReader to process the command line after the user has accepted it but before it is executed or added to the history.

See Also:

• Expander
• LineReader

Constructor Summary

Constructors

Constructor	Description
DefaultExpander()

Method Summary

Modifier and Type	Method	Description
String	expandHistory(History history, String line)	Expand event designator such as !!
String	expandVar(String word)	Expands variables in the input word.
protected int	searchBackwards(History history, String searchTerm, int startIndex, boolean startsWith)

Methods inherited from class java.lang.Object

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

Constructor Details

DefaultExpander

public DefaultExpander()

Method Details

expandHistory

public String expandHistory(History history,
 String line)

Expand event designator such as !!, !#, !3, etc... See http://www.gnu.org/software/bash/manual/html_node/Event-Designators.html

Specified by:

expandHistory in interface Expander

Parameters:

history - the command history to use for expansion

line - the input line containing history references

Returns:

the line with history references expanded

expandVar

public String expandVar(String word)

Description copied from interface: Expander

Expands variables in the input word.

This method processes variable references such as $VAR or ${VAR}, replacing them with their values. The specific syntax and behavior depends on the implementation.

Specified by:

expandVar in interface Expander

Parameters:

word - the word containing variable references

Returns:

the word with variables expanded

searchBackwards

protected int searchBackwards(History history,
 String searchTerm,
 int startIndex,
 boolean startsWith)