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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.

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/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.javascript;

import java.io.Serializable;

/**
 * This class represents an element on the script execution stack.
 * @see RhinoException#getScriptStack()
 * @author Hannes Wallnoefer
 * @since 1.7R3
 */
public final class ScriptStackElement implements Serializable {

    static final long serialVersionUID = -6416688260860477449L;
    
    public final String fileName;
    public final String functionName;
    public final int lineNumber;

    public ScriptStackElement(String fileName, String functionName, int lineNumber) {
        this.fileName = fileName;
        this.functionName = functionName;
        this.lineNumber = lineNumber;
    }

    public String toString() {
        StringBuilder sb = new StringBuilder();
        renderMozillaStyle(sb);
        return sb.toString();
    }

    /**
     * Render stack element in Java-inspired style:
     *     at fileName:lineNumber (functionName)
     * @param sb the StringBuilder to append to
     */
    public void renderJavaStyle(StringBuilder sb) {
        sb.append("\tat ").append(fileName);
        if (lineNumber > -1) {
            sb.append(':').append(lineNumber);
        }
        if (functionName != null) {
            sb.append(" (").append(functionName).append(')');
        }
    }

    /**
     * Render stack element in Mozilla/Firefox style:
     * functionName()@fileName:lineNumber
     * @param sb the StringBuilder to append to
     */
    public void renderMozillaStyle(StringBuilder sb) {
        if (functionName != null) {
            sb.append(functionName).append("()");
        }
        sb.append('@').append(fileName);
        if (lineNumber > -1) {
            sb.append(':').append(lineNumber);
        }
    }

}