IPredicateRule

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org.eclipse.jface.text.rules
Interface IPredicateRule

All Superinterfaces:: IRule

All Known Implementing Classes:: PatternRule

public interface IPredicateRule
extends IRule

Defines the interface for a rule used in the scanning of text for the purpose of document partitioning or text styling. A predicate rule can only return one single token after having successfully detected content. This token is called success token. Also, it also returns a token indicating that this rule has not been successful.

Since:: 2.0

Method Summary

IToken evaluate(ICharacterScanner scanner, boolean resume)
Evaluates the rule by examining the characters available from the provided character scanner.

IToken getSuccessToken()
Returns the success token of this predicate rule.

Methods inherited from interface org.eclipse.jface.text.rules.IRule

evaluate

Method Detail

getSuccessToken

public IToken getSuccessToken()

Returns the success token of this predicate rule.

evaluate

public IToken evaluate(ICharacterScanner scanner,
                       boolean resume)

Evaluates the rule by examining the characters available from the provided character scanner. The token returned by this rule returns true when calling isUndefined, if the text the rule investigated does not match the rule's requirements. Otherwise, this method returns this rule's success token. If this rules relies on a text pattern comprising a opening and a closing character sequence this method can also be called when the scanner is positioned already between the opening and the closing sequence. In this case, resume must be set to true.