1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325
|
/* libobby - Network text editing library
* Copyright (C) 2005, 2006 0x539 dev group
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef _OBBY_INSERT_OPERATION_HPP_
#define _OBBY_INSERT_OPERATION_HPP_
#include "text.hpp"
#include "operation.hpp"
namespace obby
{
/** insert_operation inserts an amount of text at a specified position in
* the document.
*
* This is the base class for both reversed and non-reversed insert
* operations that implements common functionality.
*/
template<typename Document, typename String>
class basic_insert_operation: public operation<Document>
{
public:
typedef operation<Document> operation_type;
typedef basic_insert_operation<Document, String>
base_insert_operation_type;
typedef typename operation_type::document_type document_type;
typedef String string_type;
basic_insert_operation(position pos,
const String& text);
/** Creates a copy of this operation.
*/
virtual operation_type* clone() const;
/** Creates the reverse operation of this one.
* @param doc Document to receive additional information from.
*/
virtual operation_type* reverse(const document_type& doc) const;
/** Transforms <em>base_op</em> against this operation.
*/
virtual operation_type* transform(const operation_type& base_op) const;
/** Includes the effect of the given insertion into this operation.
*/
virtual operation_type* transform_insert(position pos,
const std::string& text) const;
/** Includes the effect of the given deletion into this operation.
*/
virtual operation_type* transform_delete(position pos,
position len) const;
protected:
position m_pos;
string_type m_text;
// Has to be implemented by subclasses since basic_insert_operation
// is abstract
virtual base_insert_operation_type*
construct(position pos,
const string_type& text) const = 0;
};
/** Operation that insert text at a position in the document.
*/
template<typename Document>
class insert_operation: public basic_insert_operation<Document, std::string>
{
public:
typedef operation<Document> operation_type;
typedef typename basic_insert_operation<Document, std::string>::
base_insert_operation_type base_insert_operation_type;
typedef typename operation_type::document_type document_type;
typedef typename basic_insert_operation<Document, std::string>::
string_type string_type;
insert_operation(position pos,
const string_type& text);
insert_operation(const net6::packet& pack,
unsigned int& index);
virtual void apply(document_type& doc,
const user* author) const;
virtual void append_packet(net6::packet& pack) const;
protected:
virtual base_insert_operation_type*
construct(position pos,
const string_type& text) const;
};
/** @brief Operation that is the result of a reverse() call to delete_operation.
*
* A delete operation may have deleted text of multiple users, so this class
* also stores the authors of the text to insert.
*
* TODO: Rename in reversed_insert_operation
*/
template<typename Document>
class reversible_insert_operation: public basic_insert_operation<Document, text>
{
public:
typedef operation<Document> operation_type;
typedef typename basic_insert_operation<Document, text>::
base_insert_operation_type base_insert_operation_type;
typedef typename operation_type::document_type document_type;
typedef typename basic_insert_operation<Document, text>::string_type
string_type;
reversible_insert_operation(position pos,
const string_type& text);
reversible_insert_operation(const net6::packet& pack,
unsigned int& index,
const user_table& user_table);
virtual void apply(document_type& doc,
const user* author) const;
virtual void append_packet(net6::packet& pack) const;
protected:
virtual base_insert_operation_type*
construct(position pos,
const string_type& text) const;
};
template<typename Document, typename String>
basic_insert_operation<Document, String>::
basic_insert_operation(position pos,
const string_type& text):
operation<Document>(), m_pos(pos), m_text(text)
{
}
template<typename Document, typename String>
typename basic_insert_operation<Document, String>::operation_type*
basic_insert_operation<Document, String>::clone() const
{
return construct(m_pos, m_text);
}
template<typename Document, typename String>
typename basic_insert_operation<Document, String>::operation_type*
basic_insert_operation<Document, String>::
reverse(const document_type& doc) const
{
return new delete_operation<Document>(m_pos, m_text.length() );
}
template<typename Document, typename String>
typename basic_insert_operation<Document, String>::operation_type*
basic_insert_operation<Document, String>::
transform(const operation_type& base_op) const
{
return base_op.transform_insert(m_pos, m_text);
}
template<typename Document, typename String>
typename basic_insert_operation<Document, String>::operation_type*
basic_insert_operation<Document, String>::
transform_insert(position pos,
const std::string& text) const
{
if(m_pos < pos)
{
// Case 1
return clone();
}
else if(m_pos == pos)
{
// Special case
if(m_text < text)
{
return clone();
}
else
{
return construct(m_pos + text.length(), m_text);
}
}
else
{
// Case 2
return construct(
m_pos + text.length(),
m_text
);
}
}
template<typename Document, typename String>
typename basic_insert_operation<Document, String>::operation_type*
basic_insert_operation<Document, String>::transform_delete(position pos,
position len) const
{
if(m_pos <= pos)
{
// Case 3
return clone();
}
else if(m_pos > pos + len)
{
// Case 4
return construct(m_pos - len, m_text);
}
else
{
// Case 5
return construct(pos, m_text);
}
}
template<typename Document>
insert_operation<Document>::insert_operation(position pos,
const string_type& text):
basic_insert_operation<Document, std::string>(pos, text)
{
}
template<typename Document>
insert_operation<Document>::insert_operation(const net6::packet& pack,
unsigned int& index):
basic_insert_operation<Document, std::string>(
pack.get_param(index + 0).net6::parameter::as<int>(),
pack.get_param(index + 1).net6::parameter::as<std::string>()
)
{
index += 2;
}
template<typename Document>
void insert_operation<Document>::apply(document_type& doc,
const user* author) const
{
doc.insert(
basic_insert_operation<Document, std::string>::m_pos,
basic_insert_operation<Document, std::string>::m_text,
author
);
}
template<typename Document>
void insert_operation<Document>::append_packet(net6::packet& pack) const
{
pack << "ins" << basic_insert_operation<Document, std::string>::m_pos
<< basic_insert_operation<Document, std::string>::m_text;
}
template<typename Document>
typename insert_operation<Document>::base_insert_operation_type*
insert_operation<Document>::construct(position pos,
const string_type& text) const
{
return new insert_operation<Document>(pos, text);
}
template<typename Document>
reversible_insert_operation<Document>::
reversible_insert_operation(position pos,
const string_type& text):
basic_insert_operation<Document, obby::text>(pos, text)
{
}
template<typename Document>
reversible_insert_operation<Document>::
reversible_insert_operation(const net6::packet& pack,
unsigned int& index,
const user_table& user_table):
basic_insert_operation<Document, text>(
pack.get_param(index ++).net6::parameter::as<int>(),
text(pack, index, user_table)
)
{
}
template<typename Document>
void reversible_insert_operation<Document>::apply(document_type& doc,
const user* author) const
{
doc.insert(
basic_insert_operation<Document, text>::m_pos,
basic_insert_operation<Document, text>::m_text
);
}
template<typename Document>
void reversible_insert_operation<Document>::
append_packet(net6::packet& pack) const
{
pack << "revins" << basic_insert_operation<Document, text>::m_pos;
basic_insert_operation<Document, text>::m_text.append_packet(pack);
}
template<typename Document>
typename reversible_insert_operation<Document>::base_insert_operation_type*
reversible_insert_operation<Document>::construct(position pos,
const string_type& text) const
{
return new reversible_insert_operation<Document>(pos, text);
}
} // namespace obby
#endif // _OBBY_INSERT_OPERATION_HPP_
|