/DICK.B1/IronPython.Modules/_warnings.cs

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 *

 * Copyright (c) Microsoft Corporation. 

 *

 * This source code is subject to terms and conditions of the Microsoft Public License. A 

 * copy of the license can be found in the License.html file at the root of this distribution. If 

 * you cannot locate the  Microsoft Public License, please send an email to 

 * dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound 

 * by the terms of the Microsoft Public License.

 *

 * You must not remove this notice, or any other, from this software.

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using System;

using System.Collections.Generic;

using System.IO;

using System.Runtime.CompilerServices;

using System.Runtime.InteropServices;

using System.Text;

using System.Text.RegularExpressions;

using IronPython.Runtime;

using IronPython.Runtime.Exceptions;

using IronPython.Runtime.Operations;

using IronPython.Runtime.Types;

using Microsoft.Scripting;

using Microsoft.Scripting.Runtime;



[assembly: PythonModule("_warnings", typeof(IronPython.Modules.PythonWarnings))]

namespace IronPython.Modules {

    public static class PythonWarnings {

        public const string __doc__ = "Provides low-level functionality for reporting warnings";



        private static readonly object _keyFields = new object();

        private static readonly string _keyDefaultAction = "default_action";

        private static readonly string _keyFilters = "filters";

        private static readonly string _keyOnceRegistry = "once_registry";



        [SpecialName]

        public static void PerformModuleReload(PythonContext/*!*/ context, PythonDictionary/*!*/ dict) {

            context.GetOrCreateModuleState(_keyFields, () => {

                dict.Add(_keyDefaultAction, "default");

                dict.Add(_keyOnceRegistry, new PythonDictionary());

                dict.Add(_keyFilters, new List() {

                    // Default filters

                    PythonTuple.MakeTuple("ignore", null, PythonExceptions.PendingDeprecationWarning, null, 0),

                    PythonTuple.MakeTuple("ignore", null, PythonExceptions.ImportWarning, null, 0),

                    PythonTuple.MakeTuple("ignore", null, PythonExceptions.BytesWarning, null, 0)

                });

                return dict;

            });

        }



        #region Public API



        public static void warn(CodeContext context, object message, [DefaultParameterValue(null)]PythonType category, [DefaultParameterValue(1)]int stacklevel) {

            PythonContext pContext = PythonContext.GetContext(context);

            List argv = pContext.GetSystemStateValue("argv") as List;

            PythonDictionary dict = pContext.GetSystemStateValue("__dict__") as PythonDictionary;



            if (PythonOps.IsInstance(message, PythonExceptions.Warning)) {

                category = DynamicHelpers.GetPythonType(message);

            }

            if (category == null) {

                category = PythonExceptions.UserWarning;

            }

            if (!category.IsSubclassOf(PythonExceptions.Warning)) {

                throw PythonOps.ValueError("category is not a subclass of Warning");

            }



            // default behavior without sys._getframe

            PythonDictionary globals = Builtin.globals(context) as PythonDictionary;

            int lineno = 1;



            string module;

            string filename;

            if (globals != null && globals.ContainsKey("__name__")) {

                module = (string)globals.get("__name__");

            } else {

                module = "<string>";

            }



            filename = globals.get("__file__") as string;

            if (filename == null || filename == "") {

                if (module == "__main__") {

                    if (argv != null && argv.Count > 0) {

                        filename = argv[0] as string;

                    } else {

                        // interpreter lacks sys.argv

                        filename = "__main__";

                    }

                }

                if (filename == null || filename == "") {

                    filename = module;

                }

            }



            PythonDictionary registry = (PythonDictionary)globals.setdefault("__warningregistry__", new PythonDictionary());

            warn_explicit(context, message, category, filename, lineno, module, registry, globals);

        }



        public static void warn_explicit(CodeContext context, object message, PythonType category, string filename, int lineno, [DefaultParameterValue(null)]string module, [DefaultParameterValue(null)]PythonDictionary registry, [DefaultParameterValue(null)]object module_globals) {

            PythonContext pContext = PythonContext.GetContext(context);

            PythonDictionary fields = (PythonDictionary)pContext.GetModuleState(_keyFields);

            PythonExceptions.BaseException msg;

            string text; // message text



            if (module == null || module == "") {

                module = (filename == null || filename == "") ? "<unknown>" : filename;

                if (module.EndsWith(".py")) {

                    module = module.Substring(0, module.Length - 3);

                }

            }

            if (registry == null) {

                registry = new PythonDictionary();

            }

            if (PythonOps.IsInstance(message, PythonExceptions.Warning)) {

                msg = (PythonExceptions.BaseException)message;

                text = msg.ToString();

                category = DynamicHelpers.GetPythonType(msg);

            } else {

                text = message.ToString();

                msg = PythonExceptions.CreatePythonThrowable(category, message.ToString());

            }



            PythonTuple key = PythonTuple.MakeTuple(text, category, lineno);

            if (registry.ContainsKey(key)) {

                return;

            }



            string action = Converter.ConvertToString(fields[_keyDefaultAction]);

            PythonTuple last_filter = null;

            bool loop_break = false;

            foreach (PythonTuple filter in (List)fields[_keyFilters]) {

                last_filter = filter;

                action = (string)filter._data[0];

                PythonRegex.RE_Pattern fMsg = (PythonRegex.RE_Pattern)filter._data[1];

                PythonType fCat = (PythonType)filter._data[2];

                PythonRegex.RE_Pattern fMod = (PythonRegex.RE_Pattern)filter._data[3];

                int fLno;

                if (filter._data[4] is int) {

                    fLno = (int)filter._data[4];

                } else {

                    fLno = (Extensible<int>)filter._data[4];

                }



                if ((fMsg == null || fMsg.match(text) != null) &&

                    category.IsSubclassOf(fCat) &&

                    (fMod == null || fMod.match(module) != null) &&

                    (fLno == 0 || fLno == lineno)) {

                    loop_break = true;

                    break;

                }

            }

            if (!loop_break) {

                action = Converter.ConvertToString(fields[_keyDefaultAction]);

            }



            switch (action) {

                case "ignore":

                    registry.Add(key, 1);

                    return;

                case "error":

                    throw msg.GetClrException();

                case "once":

                    registry.Add(key, 1);

                    PythonTuple onceKey = PythonTuple.MakeTuple(text, category);

                    PythonDictionary once_reg = (PythonDictionary)fields[_keyOnceRegistry];

                    if (once_reg.ContainsKey(onceKey)) {

                        return;

                    }

                    once_reg.Add(key, 1);

                    break;

                case "always":

                    break;

                case "module":

                    registry.Add(key, 1);

                    PythonTuple altKey = PythonTuple.MakeTuple(text, category, 0);

                    if (registry.ContainsKey(altKey)) {

                        return;

                    }

                    registry.Add(altKey, 1);

                    break;

                case "default":

                    registry.Add(key, 1);

                    break;

                default:

                    throw PythonOps.RuntimeError("Unrecognized action ({0}) in warnings.filters:\n {1}", action, last_filter);

            }



            object warnings = pContext.GetWarningsModule();

            if (warnings != null) {

                PythonCalls.Call(

                    context,

                    PythonOps.GetBoundAttr(context, warnings, "showwarning"),

                    msg, category, filename, lineno, null, null);

            } else {

                showwarning(context, msg, category, filename, lineno, null, null);

            }

        }



        internal static string formatwarning(object message, PythonType category, string filename, int lineno, [DefaultParameterValue(null)]string line) {

            StringBuilder sb = new StringBuilder();

            sb.AppendFormat("{0}:{1}: {2}: {3}\n", filename, lineno, category.Name, message);

            if (line == null && lineno > 0 && File.Exists(filename)) {

                StreamReader reader = new StreamReader(filename);

                for (int i = 0; i < lineno - 1; i++) {

                    reader.ReadLine();

                }

                line = reader.ReadLine();

            }

            if (line != null) {

                sb.AppendFormat("  {0}\n", line.strip());

            }

            return sb.ToString();

        }



        internal static void showwarning(CodeContext context, object message, PythonType category, string filename, int lineno, [DefaultParameterValue(null)]object file, [DefaultParameterValue(null)]string line) {

            string text = formatwarning(message, category, filename, lineno, line);



            try {

                if (file == null) {

                    PythonContext pContext = PythonContext.GetContext(context);

                    PythonFile stderr = pContext.GetSystemStateValue("stderr") as PythonFile;

                    if (stderr != null) {

                        stderr.write(text);

                    } else {

                        // use CLR stderr if python's is unavailable

                        Console.Error.Write(text);

                    }

                } else {

                    if (file is PythonFile) {

                        ((PythonFile)file).write(text);

                    } else if (file is TextWriter) {

                        ((TextWriter)file).Write(text);

                    } // unrecognized file type - warning is lost

                }

            } catch (IOException) {

                // invalid file - warning is lost

            }

        }





        #endregion

    }

}