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/*****************************************************************************
 *                                                                           *
 *  This file is part of the BeanShell Java Scripting distribution.          *
 *  Documentation and updates may be found at http://www.beanshell.org/      *
 *                                                                           *
 *  Sun Public License Notice:                                               *
 *                                                                           *
 *  The contents of this file are subject to the Sun Public License Version  *
 *  1.0 (the "License"); you may not use this file except in compliance with *
 *  the License. A copy of the License is available at http://www.sun.com    * 
 *                                                                           *
 *  The Original Code is BeanShell. The Initial Developer of the Original    *
 *  Code is Pat Niemeyer. Portions created by Pat Niemeyer are Copyright     *
 *  (C) 2000.  All Rights Reserved.                                          *
 *                                                                           *
 *  GNU Public License Notice:                                               *
 *                                                                           *
 *  Alternatively, the contents of this file may be used under the terms of  *
 *  the GNU Lesser General Public License (the "LGPL"), in which case the    *
 *  provisions of LGPL are applicable instead of those above. If you wish to *
 *  allow use of your version of this file only under the  terms of the LGPL *
 *  and not to allow others to use your version of this file under the SPL,  *
 *  indicate your decision by deleting the provisions above and replace      *
 *  them with the notice and other provisions required by the LGPL.  If you  *
 *  do not delete the provisions above, a recipient may use your version of  *
 *  this file under either the SPL or the LGPL.                              *
 *                                                                           *
 *  Patrick Niemeyer (pat@pat.net)                                           *
 *  Author of Learning Java, O'Reilly & Associates                           *
 *  http://www.pat.net/~pat/                                                 *
 *                                                                           *
 *****************************************************************************/


package bsh;

/**
	EvalError indicates that we cannot continue evaluating the script
	or the script has thrown an exception.

	EvalError may be thrown for a script syntax error, an evaluation 
	error such as referring to an undefined variable, an internal error.
	

@see TargetError */ public class EvalError extends Exception { SimpleNode node; // Note: no way to mutate the Throwable message, must maintain our own String message; CallStack callstack; public EvalError( String s, SimpleNode node, CallStack callstack ) { setMessage(s); this.node = node; // freeze the callstack for the stack trace. if ( callstack != null ) this.callstack = callstack.copy(); } /** Print the error with line number and stack trace. */ public String toString() { String trace; if ( node != null ) trace = " : at Line: "+ node.getLineNumber() + " : in file: "+ node.getSourceFile() + " : "+node.getText(); else // Users should not normally see this. trace = ": "; if ( callstack != null ) trace = trace +"\n" + getScriptStackTrace(); return getMessage() + trace; } /** Re-throw the error, prepending the specified message. */ public void reThrow( String msg ) throws EvalError { prependMessage( msg ); throw this; } /** The error has trace info associated with it. i.e. It has an AST node that can print its location and source text. */ SimpleNode getNode() { return node; } void setNode( SimpleNode node ) { this.node = node; } public String getErrorText() { if ( node != null ) return node.getText() ; else return ""; } public int getErrorLineNumber() { if ( node != null ) return node.getLineNumber() ; else return -1; } public String getErrorSourceFile() { if ( node != null ) return node.getSourceFile() ; else return ""; } public String getScriptStackTrace() { if ( callstack == null ) return ""; String trace = ""; CallStack stack = callstack.copy(); while ( stack.depth() > 0 ) { NameSpace ns = stack.pop(); SimpleNode node = ns.getNode(); if ( ns.isMethod ) { trace = trace + "\nCalled from method: " + ns.getName(); if ( node != null ) trace += " : at Line: "+ node.getLineNumber() + " : in file: "+ node.getSourceFile() + " : "+node.getText(); } } return trace; } /** @see #toString() for a full display of the information */ public String getMessage() { return message; } public void setMessage( String s ) { message = s; } /** Prepend the message if it is non-null. */ protected void prependMessage( String s ) { if ( s == null ) return; if ( message == null ) message = s; else message = s + " : "+ message; } }

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