在Rhino中获取脚本的路径

Question

我正在尝试获取在 Rhino 中执行的脚本的路径。我希望不必将目录作为第一个参数传递。我什至不知道如何获得它。我目前正在通过调用 Rhino

java -jar /some/path/to/js.jar -modules org.mozilla.javascript.commonjs.module /path/to/myscript.js

，并希望 myscript.js 能够识别 /path/to 因为它是目录名，无论我从哪里运行此脚本。唯一的其他相关问题& StackOverflow 上的建议是将 /path/to 作为参数传递，但这不是我正在寻找的解决方案。

Answer 1

不可能做你想做的事。

检测 JavaScript 解释器运行的脚本源的能力不属于 ECMAScript 语言规范或 Rhino shell 扩展。

然而，您可以编写一个包装器可执行程序，它采用脚本路径作为其参数，并在Rhino中执行脚本（例如通过调用适当的主类），并提供脚本位置作为环境变量（或类似变量）。

Answer 2

/**
 * Gets the name of the running JavaScript file.
 *
 * REQUIREMENTS:
 * 1. On the Java command line, for the argument that specifies the script's
 *    name, there can be no spaces in it. There can be spaces in other 
 *    arguments, but not the one that specifies the path to the JavaScript 
 *    file. Quotes around the JavaScript file name are irrelevant. This is
 *    a consequence of how the arguments appear in the sun.java.command
 *    system property.
 * 2. The following system property is available: sun.java.command
 *
 * @return {String} The name of the currently running script as it appeared 
 *                  on the command line.
 */
function getScriptName() {
    var scriptName = null;

    // Put all the script arguments into a string like they are in 
    // environment["sun.java.command"].
    var scriptArgs = "";
    for (var i = 0; i < this.arguments.length; i++) {
        scriptArgs = scriptArgs + " " + this.arguments[i];
    }

    // Find the script name inside the Java command line.
    var pattern = " (\\S+)" + scriptArgs + "$";
    var scriptNameRegex = new RegExp(pattern);
    var matches = scriptNameRegex.exec(environment["sun.java.command"]);
    if (matches != null) {
        scriptName = matches[1];
    }
    return scriptName;
}

/**
 * Gets a java.io.File object representing the currently running script. Refer
 * to the REQUIREMENTS for getScriptName().
 *
 * @return {java.io.File} The currently running script file
 */
function getScriptFile() {
    return new java.io.File(getScriptName());
}

/**
 * Gets the absolute path name of the running JavaScript file. Refer to
 * REQUIREMENTS in getScriptName().
 *
 * @return {String} The full path name of the currently running script
 */
function getScriptAbsolutePath() {
    return getScriptFile().getAbsolutePath();
}