Class IsIdentifier

java.lang.Object

org.ek9lang.compiler.support.IsIdentifier

All Implemented Interfaces:

Predicate<String>

public final class IsIdentifier
extends Object
implements Predicate<String>

🛑 THE characters of an EK9 identifier: true when the text is one whole identifier by the lexer's Identifier : Letter LetterOrDigit* with Letter : [a-zA-Z] and LetterOrDigit : [a-zA-Z0-9_] (EK9LexerRules.g4), keywords included. Per character: IsIdentifierStart and IsIdentifierPart. Use these rather than Character.isJavaIdentifierPart or a private copy.

Java's rule is not EK9's: it admits $, which in EK9 is the string operator. A rename that asked Java whether `${$count}` held a longer name than count was told yes - the $ in front - and skipped the site, leaving the interpolation naming a variable that no longer existed (found 2026-10-23 through ek9_find_symbols with renameTo). It also admits non-ASCII letters, which the lexer does not.

Whether a well-formed identifier is free to be a NAME is IsReservedWord's question.

Constructor Summary

Constructors

Constructor	Description
IsIdentifier()

Method Summary

Modifier and Type	Method	Description
boolean	test(String text)

Methods inherited from class Object

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

Methods inherited from interface Predicate

and, negate, or

Constructor Details

IsIdentifier

public IsIdentifier()

Method Details

test

public boolean test(String text)

Specified by:

test in interface Predicate<String>