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35 /*! \libinternal \file
37 * Declares common string formatting routines for online help.
39 * \author Teemu Murtola <teemu.murtola@gmail.com>
41 * \ingroup module_onlinehelp
43 #ifndef GMX_ONLINEHELP_HELPFORMAT_H
44 #define GMX_ONLINEHELP_HELPFORMAT_H
48 #include "../utility/common.h"
54 class HelpWriterContext;
56 /*! \libinternal \brief
57 * Formats rows of a table for text output.
59 * This utility class formats tabular data, mainly for console output.
60 * Each row in the table can take multiple lines, and automatic text wrapping
61 * is supported. If text overflows the allocated width, the remaining columns
62 * on that line become shifted. To avoid this, it is possible to start the
63 * output for different columns from different lines (it is the caller's
64 * responsibility to check that overflows are avoided or are acceptable).
66 * Column definitions are first set with addColumn().
67 * To format a row, first call clear(). Then call addColumnLine() to add text
68 * to each column (can be called multiple times on a single column to add
69 * multiple lines), and possibly setColumnFirstLineOffset() to adjust the line
70 * from which the column output should start. Finally, call formatRow() to
71 * obtain the formatted row.
73 * A header (column titles and a horizontal line) is printed before the first
78 gmx::TextTableFormatter formatter;
79 formatter.addColumn("Name", 10, false);
80 formatter.addColumn("Type", 10, false);
81 formatter.addColumn("Description", 50, true);
84 formatter.addColumnLine(0, "name");
85 formatter.addColumnLine(1, "type");
86 formatter.addColumnLine(2, "Description for name");
87 printf("%s", formatter.formatRow().c_str());
90 formatter.addColumnLine(0, "averylongname");
91 formatter.addColumnLine(1, "type");
92 formatter.setColumnFirstLineOffset(1, 1);
93 formatter.addColumnLine(2, "Description for name");
94 printf("%s", formatter.formatRow().c_str());
96 // format other rows by repeating the above code
99 * Methods in this class may throw std::bad_alloc if out of memory.
100 * Other exceptions are not thrown.
103 * \ingroup module_onlinehelp
105 class TextTableFormatter
108 //! Constructs an empty formatter.
109 TextTableFormatter();
110 ~TextTableFormatter();
113 * Adds a column to the table.
115 * \param[in] title Title string for the column (used for header).
116 * \param[in] width Width of the column (must be > 0).
117 * \param[in] bWrap Whether text that exceeds \p width is
118 * automatically wrapped.
120 * The length of \p title must not exceed \p width.
122 void addColumn(const char *title, int width, bool bWrap);
124 * Sets amount on indentation before the first column.
126 * \param[in] indent Number of spaces to use for indenting.
130 void setFirstColumnIndent(int indent);
133 * Whether formatRow() has been successfully called.
135 * This method can be used to determine after-the-fact whether anything
136 * was written in the table.
140 bool didOutput() const;
143 * Removes all text from all columns and resets the line offsets.
145 * Removes all text added using addColumnLine() and resets line offsets
146 * set with setColumnFirstLineOffset() to zero.
147 * Should be called before starting to add data for a row.
153 * Adds text to be printed in a column.
155 * \param[in] index Zero-based column index.
156 * \param[in] text Text to add.
158 * Can be called multiple times. Additional calls append \p text as
159 * additional lines. Any calls with \p text empty have no effect.
160 * To add an empty line, use "\n" as \p text.
162 * If \p text contains newlines, the text is automatically splitted to
163 * multiple lines. The same happens if automatic wrapping is on for
164 * the column and the text contains lines that are longer than what
167 void addColumnLine(int index, const std::string &text);
169 * Adds text containing help markup to be printed in a column.
171 * \param[in] index Zero-based column index.
172 * \param[in] context Context to use for markup processing.
173 * \param[in] text Text to add.
175 * Works as addColumnLine(), except that it uses
176 * HelpWriterContext::substituteMarkupAndWrapToVector() to process
177 * markup in the input text instead of just wrapping it as plain text.
179 void addColumnHelpTextBlock(int index, const HelpWriterContext &context,
180 const std::string &text);
182 * Sets the first line to which text is printed for a column.
184 * \param[in] index Zero-based column index.
185 * \param[in] firstLine Zero-based line index from which to start the
188 * Can be called if there is no text for column \p index.
189 * Does not affect the output in this case.
193 void setColumnFirstLineOffset(int index, int firstLine);
195 * Formats the lines for the current row.
197 * \returns Current row formatted as a single string
198 * (contains newlines).
200 * Formats the data as set after the previous clear()/formatRow() using
201 * addColumnLine() and setColumnFirstLineOffset().
203 * If this is the first line to be formatted, a header is also added to
204 * the beginning of the returned string if any column has a title.
206 * The return value always terminates with a newline.
208 * Calls clear() on successful return.
210 std::string formatRow();
213 * Returns the last line on which column \p index has text.
215 * \param[in] index Zero-based column index.
216 * \returns Last line index (zero-based) on which \p index has text.
218 * The return value is the sum of the number of lines added with
219 * addColumnLine() (taking into account possible wrapping) and the line
220 * offset set with setColumnFirstLineOffset().
224 int lastColumnLine(int index) const;
229 PrivateImplPointer<Impl> impl_;