options.java

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// Copyright (c) Corporation for National Research Initiatives
package org.python.core;

/**
 * A class with static fields for each of the settable options.
 * The options from registry and command line is copied into
 * the fields here and the rest of Jyhton checks these fields.
 */
public class Options
{
    // JPython options.  Some of these can be set from the command line
    // options, but all can be controlled through the JPython registry

    /**
     * when an exception occurs in Java code, and it is not caught, should
     * the interpreter print out the Java exception in the traceback?
     */
    public static boolean showJavaExceptions = false;

    /**
     * When true, python exception raised in overriden methods will
     * be shown on stderr. This option is remarkable usefull when
     * python is used for implementing CORBA server. Some CORBA
     * servers will turn python exception (say a NameError) into an
     * anonymous user exception without any stacktrace. Setting this
     * option will show the stacktrace.
     */
    public static boolean showPythonProxyExceptions = false;

    /**
     * To force JIT compilation of Jython code -- should be unnecessary
     * Setting this to true will cause jdk1.2rc1 to core dump on Windows
     */
    public static boolean skipCompile = true;

    /**
     * Setting this to true will cause the console to poll standard in.
     * This might be helpful on systems without system-level threads.
     */
    public static boolean pollStandardIn = false;

    /**
     * If true, JPython respects Java the accessibility flag for fields,
     * methods, and constructors.  This means you can only access public
     * members.  Set this to false to access all members by toggling the
     * accessible flag on the member.
     */
    public static boolean respectJavaAccessibility = true;

    /**
     * When false the <code>site.py</code> will not be imported.
     * This is only honored by the command line main class.
     */
    public static boolean importSite = true;

    /**
     * Set verbosity to Py.ERROR, Py.WARNING, Py.MESSAGE, Py.COMMENT,
     * or Py.DEBUG for varying levels of informative messages from
     * Jython. Normally this option is set from the command line.
     */
    public static int verbose = Py.MESSAGE;

    /**
     * Setting this to true will support old 1.0 style keyword+"_" names.
     * This isn't needed any more due to improvements in the parser
     */
    public static boolean deprecatedKeywordMangling = true;

    /**
     * A directory where the dynamicly generated classes are written.
     * Nothing is ever read from here, it is only for debugging
     * purposes.
     */
    public static String proxyDebugDirectory = null;

    /**
     * If true, Jython will use the first module found on sys.path
     * where java File.isFile() returns true. Setting this to true
     * have no effect on unix-type filesystems. On Windows/HPS+
     * systems setting it to true will enable Jython-2.0 behaviour.
     */
    public static boolean caseok = false;

    /**
     * If true, enable truedivision for the '/' operator.
     */ 
    public static boolean Qnew = false;

    /**
     * Enable division warning. The value maps to the registry values of
     * <ul>
     * <li>old: 0</li>
     * <li>warn: 1</li>
     * <li>warnall: 2</li>
     * </ul>
     */
    public static int divisionWarning = 0;

    //
    // ####### END OF OPTIONS
    //

    private Options() { ; }

    private static boolean getBooleanOption(String name, boolean defaultValue)
    {
        String prop = PySystemState.registry.getProperty("python."+name);
        if (prop == null)
            return defaultValue;
        return prop.equalsIgnoreCase("true") || prop.equalsIgnoreCase("yes");
    }

    private static String getStringOption(String name, String defaultValue) {
        String prop = PySystemState.registry.getProperty("python."+name);
        if (prop == null)
            return defaultValue;
        return prop;
    }


    /**
     * Initialize the static fields from the registry options.
     */
    public static void setFromRegistry() {
        // Set the more unusual options
        Options.showJavaExceptions =
            getBooleanOption("options.showJavaExceptions",
                             Options.showJavaExceptions);

        Options.showPythonProxyExceptions =
            getBooleanOption("options.showPythonProxyExceptions",
                             Options.showPythonProxyExceptions);

        Options.skipCompile =
            getBooleanOption("options.skipCompile", Options.skipCompile);

        Options.deprecatedKeywordMangling =
            getBooleanOption("deprecated.keywordMangling",
                             Options.deprecatedKeywordMangling);

        Options.pollStandardIn =
            getBooleanOption("console.poll", Options.pollStandardIn);

        Options.respectJavaAccessibility =
            getBooleanOption("security.respectJavaAccessibility",
                             Options.respectJavaAccessibility);

        Options.proxyDebugDirectory =
            getStringOption("options.proxyDebugDirectory",
                             Options.proxyDebugDirectory);

        // verbosity is more complicated:
        String prop = PySystemState.registry.getProperty("python.verbose");
        if (prop != null) {
            if (prop.equalsIgnoreCase("error"))
                Options.verbose = Py.ERROR;
            else if (prop.equalsIgnoreCase("warning"))
                Options.verbose = Py.WARNING;
            else if (prop.equalsIgnoreCase("message"))
                Options.verbose = Py.MESSAGE;
            else if (prop.equalsIgnoreCase("comment"))
                Options.verbose = Py.COMMENT;
            else if (prop.equalsIgnoreCase("debug"))
                Options.verbose = Py.DEBUG;
            else
                throw Py.ValueError("Illegal verbose option setting: '"+
                                    prop+"'");
        }

        Options.caseok =
            getBooleanOption("options.caseok", Options.caseok);

        Options.Qnew =
            getBooleanOption("options.Qnew", Options.Qnew);

        prop = PySystemState.registry.getProperty("python.divisionWarning");
        if (prop != null) {
            if (prop.equalsIgnoreCase("old"))
                Options.divisionWarning = 0;
            else if (prop.equalsIgnoreCase("warn"))
                Options.divisionWarning = 1;
            else if (prop.equalsIgnoreCase("warnall"))
                Options.divisionWarning = 2;
            else
                throw Py.ValueError("Illegal divisionWarning option " +
                                    "setting: '"+ prop+"'");
        }
        // additional initializations which must happen after the registry
        // is guaranteed to be initialized.
        JavaAccessibility.initialize();
    }
}