[8295] | 1 | #region Copyright notice and license
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| 2 |
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| 3 | // Protocol Buffers - Google's data interchange format
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| 4 | // Copyright 2008 Google Inc. All rights reserved.
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| 5 | // http://github.com/jskeet/dotnet-protobufs/
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| 6 | // Original C++/Java/Python code:
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| 7 | // http://code.google.com/p/protobuf/
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| 8 | //
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| 9 | // Redistribution and use in source and binary forms, with or without
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| 10 | // modification, are permitted provided that the following conditions are
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| 11 | // met:
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| 12 | //
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| 13 | // * Redistributions of source code must retain the above copyright
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| 14 | // notice, this list of conditions and the following disclaimer.
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| 15 | // * Redistributions in binary form must reproduce the above
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| 16 | // copyright notice, this list of conditions and the following disclaimer
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| 17 | // in the documentation and/or other materials provided with the
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| 18 | // distribution.
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| 19 | // * Neither the name of Google Inc. nor the names of its
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| 20 | // contributors may be used to endorse or promote products derived from
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| 21 | // this software without specific prior written permission.
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| 22 | //
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| 23 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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| 24 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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| 25 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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| 26 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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| 27 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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| 28 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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| 29 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 30 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 31 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 32 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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| 33 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 34 |
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| 35 | #endregion
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| 36 |
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| 37 | using System;
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| 38 | using System.IO;
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| 39 | using System.Text;
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| 40 |
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| 41 | namespace Google.ProtocolBuffers
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| 42 | {
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| 43 | /// <summary>
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| 44 | /// Helper class to control indentation. Used for TextFormat and by ProtoGen.
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| 45 | /// </summary>
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| 46 | public sealed class TextGenerator
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| 47 | {
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| 48 | /// <summary>
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| 49 | /// The string to use at the end of each line. We assume that "Print" is only called using \n
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| 50 | /// to indicate a line break; that's what we use to detect when we need to indent etc, and
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| 51 | /// *just* the \n is replaced with the contents of lineBreak.
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| 52 | /// </summary>
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| 53 | private readonly string lineBreak;
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| 54 |
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| 55 | /// <summary>
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| 56 | /// Writer to write formatted text to.
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| 57 | /// </summary>
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| 58 | private readonly TextWriter writer;
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| 59 |
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| 60 | /// <summary>
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| 61 | /// Keeps track of whether the next piece of text should be indented
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| 62 | /// </summary>
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| 63 | private bool atStartOfLine = true;
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| 64 |
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| 65 | /// <summary>
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| 66 | /// Keeps track of the current level of indentation
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| 67 | /// </summary>
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| 68 | private readonly StringBuilder indent = new StringBuilder();
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| 69 |
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| 70 | /// <summary>
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| 71 | /// Creates a generator writing to the given writer. The writer
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| 72 | /// is not closed by this class.
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| 73 | /// </summary>
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| 74 | public TextGenerator(TextWriter writer, string lineBreak)
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| 75 | {
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| 76 | this.writer = writer;
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| 77 | this.lineBreak = lineBreak;
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| 78 | }
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| 79 |
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| 80 | /// <summary>
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| 81 | /// Indents text by two spaces. After calling Indent(), two spaces
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| 82 | /// will be inserted at the beginning of each line of text. Indent() may
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| 83 | /// be called multiple times to produce deeper indents.
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| 84 | /// </summary>
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| 85 | public void Indent()
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| 86 | {
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| 87 | indent.Append(" ");
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| 88 | }
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| 89 |
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| 90 | /// <summary>
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| 91 | /// Reduces the current indent level by two spaces.
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| 92 | /// </summary>
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| 93 | public void Outdent()
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| 94 | {
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| 95 | if (indent.Length == 0)
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| 96 | {
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| 97 | throw new InvalidOperationException("Too many calls to Outdent()");
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| 98 | }
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| 99 | indent.Length -= 2;
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| 100 | }
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| 101 |
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| 102 | public void WriteLine(string text)
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| 103 | {
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| 104 | Print(text);
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| 105 | Print("\n");
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| 106 | }
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| 107 |
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| 108 | public void WriteLine(string format, params object[] args)
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| 109 | {
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| 110 | WriteLine(string.Format(format, args));
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| 111 | }
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| 112 |
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| 113 | public void WriteLine()
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| 114 | {
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| 115 | WriteLine("");
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| 116 | }
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| 117 |
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| 118 | /// <summary>
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| 119 | /// Prints the given text to the output stream, indenting at line boundaries.
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| 120 | /// </summary>
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| 121 | /// <param name="text"></param>
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| 122 | public void Print(string text)
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| 123 | {
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| 124 | int pos = 0;
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| 125 |
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| 126 | for (int i = 0; i < text.Length; i++)
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| 127 | {
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| 128 | if (text[i] == '\n')
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| 129 | {
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| 130 | // Strip off the \n from what we write
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| 131 | Write(text.Substring(pos, i - pos));
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| 132 | Write(lineBreak);
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| 133 | pos = i + 1;
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| 134 | atStartOfLine = true;
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| 135 | }
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| 136 | }
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| 137 | Write(text.Substring(pos));
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| 138 | }
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| 139 |
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| 140 | public void Write(string format, params object[] args)
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| 141 | {
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| 142 | Write(string.Format(format, args));
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| 143 | }
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| 144 |
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| 145 | private void Write(string data)
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| 146 | {
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| 147 | if (data.Length == 0)
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| 148 | {
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| 149 | return;
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| 150 | }
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| 151 | if (atStartOfLine)
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| 152 | {
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| 153 | atStartOfLine = false;
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| 154 | writer.Write(indent);
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| 155 | }
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| 156 | writer.Write(data);
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| 157 | }
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| 158 | }
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| 159 | } |
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