src/gromacs/onlinehelp/helpformat.h

   1 /*
   2  * This file is part of the GROMACS molecular simulation package.
   3  *
   4  * Copyright (c) 2012,2013,2014,2015, by the GROMACS development team, led by
   5  * Mark Abraham, David van der Spoel, Berk Hess, and Erik Lindahl,
   6  * and including many others, as listed in the AUTHORS file in the
   7  * top-level source directory and at http://www.gromacs.org.
   8  *
   9  * GROMACS is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public License
  11  * as published by the Free Software Foundation; either version 2.1
  12  * of the License, or (at your option) any later version.
  13  *
  14  * GROMACS is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with GROMACS; if not, see
  21  * http://www.gnu.org/licenses, or write to the Free Software Foundation,
  22  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA.
  23  *
  24  * If you want to redistribute modifications to GROMACS, please
  25  * consider that scientific software is very special. Version
  26  * control is crucial - bugs must be traceable. We will be happy to
  27  * consider code for inclusion in the official distribution, but
  28  * derived work must not be called official GROMACS. Details are found
  29  * in the README & COPYING files - if they are missing, get the
  30  * official version at http://www.gromacs.org.
  31  *
  32  * To help us fund GROMACS development, we humbly ask that you cite
  33  * the research papers on the package. Check out http://www.gromacs.org.
  34  */
  35 /*! \libinternal \file
  36  * \brief
  37  * Declares common string formatting routines for online help.
  38  *
  39  * \author Teemu Murtola <teemu.murtola@gmail.com>
  40  * \inlibraryapi
  41  * \ingroup module_onlinehelp
  42  */
  43 #ifndef GMX_ONLINEHELP_HELPFORMAT_H
  44 #define GMX_ONLINEHELP_HELPFORMAT_H
  45
  46 #include <string>
  47
  48 #include "gromacs/utility/classhelpers.h"
  49
  50 namespace gmx
  51 {
  52
  53 class HelpWriterContext;
  54
  55 /*! \libinternal \brief
  56  * Formats rows of a table for text output.
  57  *
  58  * This utility class formats tabular data, mainly for console output.
  59  * Each row in the table can take multiple lines, and automatic text wrapping
  60  * is supported.  If text overflows the allocated width, the remaining columns
  61  * on that line become shifted.  To avoid this, it is possible to start the
  62  * output for different columns from different lines (it is the caller's
  63  * responsibility to check that overflows are avoided or are acceptable).
  64  *
  65  * Column definitions are first set with addColumn().
  66  * To format a row, first call clear().  Then call addColumnLine() to add text
  67  * to each column (can be called multiple times on a single column to add
  68  * multiple lines), and possibly setColumnFirstLineOffset() to adjust the line
  69  * from which the column output should start.  Finally, call formatRow() to
  70  * obtain the formatted row.
  71  *
  72  * A header (column titles and a horizontal line) is printed before the first
  73  * line.
  74  *
  75  * Typical usage:
  76  * \code
  77    gmx::TextTableFormatter formatter;
  78    formatter.addColumn("Name", 10, false);
  79    formatter.addColumn("Type", 10, false);
  80    formatter.addColumn("Description", 50, true);
  81
  82    formatter.clear();
  83    formatter.addColumnLine(0, "name");
  84    formatter.addColumnLine(1, "type");
  85    formatter.addColumnLine(2, "Description for name");
  86    printf("%s", formatter.formatRow().c_str());
  87
  88    formatter.clear();
  89    formatter.addColumnLine(0, "averylongname");
  90    formatter.addColumnLine(1, "type");
  91    formatter.setColumnFirstLineOffset(1, 1);
  92    formatter.addColumnLine(2, "Description for name");
  93    printf("%s", formatter.formatRow().c_str());
  94
  95    // format other rows by repeating the above code
  96  * \endcode
  97  *
  98  * Methods in this class may throw std::bad_alloc if out of memory.
  99  * Other exceptions are not thrown.
 100  *
 101  * \inlibraryapi
 102  * \ingroup module_onlinehelp
 103  */
 104 class TextTableFormatter
 105 {
 106     public:
 107         //! Constructs an empty formatter.
 108         TextTableFormatter();
 109         ~TextTableFormatter();
 110
 111         /*! \brief
 112          * Adds a column to the table.
 113          *
 114          * \param[in]  title  Title string for the column (used for header).
 115          * \param[in]  width  Width of the column (must be > 0).
 116          * \param[in]  bWrap  Whether text that exceeds \p width is
 117          *      automatically wrapped.
 118          *
 119          * The length of \p title must not exceed \p width.
 120          */
 121         void addColumn(const char *title, int width, bool bWrap);
 122         /*! \brief
 123          * Sets amount on indentation before the first column.
 124          *
 125          * \param[in]  indent  Number of spaces to use for indenting.
 126          *
 127          * Does not throw.
 128          */
 129         void setFirstColumnIndent(int indent);
 130         /*! \brief
 131          * Enables folding the last column to separate lines if it overflows.
 132          *
 133          * \param[in]  indent  Number of spaces to use for indenting the lines.
 134          *
 135          * If called with `indent >= 0`, the last column for each row is
 136          * treated specially: if it contains more lines than the other columns,
 137          * and if the text would fit more compactly as separate lines after the
 138          * row, then the whole last column is written after the row with the
 139          * given \p indent.  The column text then spans the whole space
 140          * reserved for the table, making long text fit into a smaller amount
 141          * of vertical space.
 142          * If not called, the last column is not treates specially.
 143          *
 144          * Does not throw.
 145          */
 146         void setFoldLastColumnToNextLine(int indent);
 147
 148         /*! \brief
 149          * Whether formatRow() has been successfully called.
 150          *
 151          * This method can be used to determine after-the-fact whether anything
 152          * was written in the table.
 153          *
 154          * Does not throw.
 155          */
 156         bool didOutput() const;
 157
 158         /*! \brief
 159          * Removes all text from all columns and resets the line offsets.
 160          *
 161          * Removes all text added using addColumnLine() and resets line offsets
 162          * set with setColumnFirstLineOffset() to zero.
 163          * Should be called before starting to add data for a row.
 164          *
 165          * Does not throw.
 166          */
 167         void clear();
 168         /*! \brief
 169          * Adds text to be printed in a column.
 170          *
 171          * \param[in]  index     Zero-based column index.
 172          * \param[in]  text      Text to add.
 173          *
 174          * Can be called multiple times.  Additional calls append \p text as
 175          * additional lines.  Any calls with \p text empty have no effect.
 176          * To add an empty line, use "\n" as \p text.
 177          *
 178          * If \p text contains newlines, the text is automatically splitted to
 179          * multiple lines.  The same happens if automatic wrapping is on for
 180          * the column and the text contains lines that are longer than what
 181          * fits the column.
 182          */
 183         void addColumnLine(int index, const std::string &text);
 184         /*! \brief
 185          * Adds text containing help markup to be printed in a column.
 186          *
 187          * \param[in]  index     Zero-based column index.
 188          * \param[in]  context   Context to use for markup processing.
 189          * \param[in]  text      Text to add.
 190          *
 191          * Works as addColumnLine(), except that it uses
 192          * HelpWriterContext::substituteMarkupAndWrapToVector() to process
 193          * markup in the input text instead of just wrapping it as plain text.
 194          */
 195         void addColumnHelpTextBlock(int index, const HelpWriterContext &context,
 196                                     const std::string &text);
 197         /*! \brief
 198          * Sets the first line to which text is printed for a column.
 199          *
 200          * \param[in]  index     Zero-based column index.
 201          * \param[in]  firstLine Zero-based line index from which to start the
 202          *      output.
 203          *
 204          * Can be called if there is no text for column \p index.
 205          * Does not affect the output in this case.
 206          *
 207          * Does not throw.
 208          */
 209         void setColumnFirstLineOffset(int index, int firstLine);
 210         /*! \brief
 211          * Formats the lines for the current row.
 212          *
 213          * \returns  Current row formatted as a single string
 214          *      (contains newlines).
 215          *
 216          * Formats the data as set after the previous clear()/formatRow() using
 217          * addColumnLine() and setColumnFirstLineOffset().
 218          *
 219          * If this is the first line to be formatted, a header is also added to
 220          * the beginning of the returned string if any column has a title.
 221          *
 222          * The return value always terminates with a newline.
 223          *
 224          * Calls clear() on successful return.
 225          */
 226         std::string formatRow();
 227
 228     private:
 229         class Impl;
 230
 231         PrivateImplPointer<Impl> impl_;
 232 };
 233
 234 } // namespace gmx
 235
 236 #endif