[sql] Import SQLite 3.17.0.

third_party/sqlite/src/tool/Replace.cs

+/*
+** 2016 February 26
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+** This file contains C# code to perform regular expression replacements
+** using the standard input and output channels.
+*/
+
+using System;
+using System.Diagnostics;
+using System.IO;
+using System.Reflection;
+using System.Runtime.InteropServices;
+using System.Text.RegularExpressions;
+
+///////////////////////////////////////////////////////////////////////////////
+
+#region Assembly Metadata
+[assembly: AssemblyTitle("Replace Tool")]
+[assembly: AssemblyDescription("Replace text using standard input/output.")]
+[assembly: AssemblyCompany("SQLite Development Team")]
+[assembly: AssemblyProduct("SQLite")]
+[assembly: AssemblyCopyright("Public Domain")]
+[assembly: ComVisible(false)]
+[assembly: Guid("95a0513f-8863-48cd-a76f-cb80868cb578")]
+[assembly: AssemblyVersion("1.0.*")]
+
+#if DEBUG
+[assembly: AssemblyConfiguration("Debug")]
+#else
+[assembly: AssemblyConfiguration("Release")]
+#endif
+#endregion
+
+///////////////////////////////////////////////////////////////////////////////
+
+namespace Replace
+{
+    /// <summary>
+    /// This enumeration is used to represent all the possible exit codes from
+    /// this tool.
+    /// </summary>
+    internal enum ExitCode
+    {
+        /// <summary>
+        /// The file download was a success.
+        /// </summary>
+        Success = 0,
+
+        /// <summary>
+        /// The command line arguments are missing (i.e. null).  Generally,
+        /// this should not happen.
+        /// </summary>
+        MissingArgs = 1,
+
+        /// <summary>
+        /// The wrong number of command line arguments was supplied.
+        /// </summary>
+        WrongNumArgs = 2,
+
+        /// <summary>
+        /// The "matchingOnly" flag could not be converted to a value of the
+        /// <see cref="Boolean"/> type.
+        /// </summary>
+        BadMatchingOnlyFlag = 3,
+
+        /// <summary>
+        /// An exception was caught in <see cref="Main" />.  Generally, this
+        /// should not happen.
+        /// </summary>
+        Exception = 4
+    }
+
+    ///////////////////////////////////////////////////////////////////////////
+
+    internal static class Replace
+    {
+        #region Private Support Methods
+        /// <summary>
+        /// This method displays an error message to the console and/or
+        /// displays the command line usage information for this tool.
+        /// </summary>
+        /// <param name="message">
+        /// The error message to display, if any.
+        /// </param>
+        /// <param name="usage">
+        /// Non-zero to display the command line usage information.
+        /// </param>
+        private static void Error(
+            string message,
+            bool usage
+            )
+        {
+            if (message != null)
+                Console.WriteLine(message);
+
+            string fileName = Path.GetFileName(
+                Process.GetCurrentProcess().MainModule.FileName);
+
+            Console.WriteLine(String.Format(
+                "usage: {0} <regExPattern> <regExSubSpec> <matchingOnly>",
+                fileName));
+        }
+        #endregion
+
+        ///////////////////////////////////////////////////////////////////////
+
+        #region Program Entry Point
+        /// <summary>
+        /// This is the entry-point for this tool.  It handles processing the
+        /// command line arguments, reading from the standard input channel,
+        /// replacing any matching lines of text, and writing to the standard
+        /// output channel.
+        /// </summary>
+        /// <param name="args">
+        /// The command line arguments.
+        /// </param>
+        /// <returns>
+        /// Zero upon success; non-zero on failure.  This will be one of the
+        /// values from the <see cref="ExitCode" /> enumeration.
+        /// </returns>
+        private static int Main(
+            string[] args
+            )
+        {
+            //
+            // NOTE: Sanity check the command line arguments.
+            //
+            if (args == null)
+            {
+                Error(null, true);
+                return (int)ExitCode.MissingArgs;
+            }
+
+            if (args.Length != 3)
+            {
+                Error(null, true);
+                return (int)ExitCode.WrongNumArgs;
+            }
+
+            try
+            {
+                //
+                // NOTE: Create a regular expression from the first command
+                //       line argument.  Then, grab the replacement string,
+                //       which is the second argument.
+                //
+                Regex regEx = new Regex(args[0]);
+                string replacement = args[1];
+
+                //
+                // NOTE: Attempt to convert the third argument to a boolean.
+                //
+                bool matchingOnly;
+
+                if (!bool.TryParse(args[2], out matchingOnly))
+                {
+                    Error(null, true);
+                    return (int)ExitCode.BadMatchingOnlyFlag;
+                }
+
+                //
+                // NOTE: Grab the standard input and output channels from the
+                //       console.
+                //
+                TextReader inputTextReader = Console.In;
+                TextWriter outputTextWriter = Console.Out;
+
+                //
+                // NOTE: Loop until end-of-file is hit on the standard input
+                //       stream.
+                //
+                while (true)
+                {
+                    //
+                    // NOTE: Read a line from the standard input channel.  If
+                    //       null is returned here, there is no more input and
+                    //       we are done.
+                    //
+                    string inputLine = inputTextReader.ReadLine();
+
+                    if (inputLine == null)
+                        break;
+
+                    //
+                    // NOTE: Perform regular expression replacements on this
+                    //       line, if any.  Then, write the modified line to
+                    //       the standard output channel.
+                    //
+                    string outputLine = regEx.Replace(inputLine, replacement);
+
+                    if (!matchingOnly || !String.Equals(
+                            inputLine, outputLine, StringComparison.Ordinal))
+                    {
+                        outputTextWriter.WriteLine(outputLine);
+                    }
+                }
+
+                //
+                // NOTE: At this point, everything has succeeded.
+                //
+                return (int)ExitCode.Success;
+            }
+            catch (Exception e)
+            {
+                //
+                // NOTE: An exception was caught.  Report it via the console
+                //       and return failure.
+                //
+                Error(e.ToString(), false);
+                return (int)ExitCode.Exception;
+            }
+        }
+        #endregion
+    }
+}