# Package org.eclipse.wst.jsdt.core.compiler

Interface Summary
IProblem: Description of a JavaScript problem, as detected by the validator A problem provides access to: its location (originating source file name, source position, line number), its message description and a predicate to check its severity (warning or error).
IScanner: Definition of a JavaScript scanner, as returned by the `ToolFactory`.
ITerminalSymbols: Maps each terminal symbol in the javaScript-grammar into a unique integer.

Class Summary
BuildContext: The context of a validation event that is notified to interested validation participants when {@link ValidationParticipant#buildStarting(BuildContext[], boolean) a build is starting.
CategorizedProblem: Richer description of a JavaScript problem, as detected by the compiler or some of the underlying technology reusing the compiler.
CharOperation: This class is a collection of helper methods to manipulate char arrays.
ReconcileContext: The context of a reconcile event that is notified to interested validation participants while a reconcile operation is running.
ValidationParticipant: A validation participant is notified of events occuring during the validation process.

Exception Summary
InvalidInputException: Exception thrown by a scanner when encountering lexical errors.