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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);
132 * Enables folding the last column to separate lines if it overflows.
134 * \param[in] indent Number of spaces to use for indenting the lines.
136 * If called with `indent >= 0`, the last column for each row is
137 * treated specially: if it contains more lines than the other columns,
138 * and if the text would fit more compactly as separate lines after the
139 * row, then the whole last column is written after the row with the
140 * given \p indent. The column text then spans the whole space
141 * reserved for the table, making long text fit into a smaller amount
143 * If not called, the last column is not treates specially.
147 void setFoldLastColumnToNextLine(int indent);
150 * Whether formatRow() has been successfully called.
152 * This method can be used to determine after-the-fact whether anything
153 * was written in the table.
157 bool didOutput() const;
160 * Removes all text from all columns and resets the line offsets.
162 * Removes all text added using addColumnLine() and resets line offsets
163 * set with setColumnFirstLineOffset() to zero.
164 * Should be called before starting to add data for a row.
170 * Adds text to be printed in a column.
172 * \param[in] index Zero-based column index.
173 * \param[in] text Text to add.
175 * Can be called multiple times. Additional calls append \p text as
176 * additional lines. Any calls with \p text empty have no effect.
177 * To add an empty line, use "\n" as \p text.
179 * If \p text contains newlines, the text is automatically splitted to
180 * multiple lines. The same happens if automatic wrapping is on for
181 * the column and the text contains lines that are longer than what
184 void addColumnLine(int index, const std::string &text);
186 * Adds text containing help markup to be printed in a column.
188 * \param[in] index Zero-based column index.
189 * \param[in] context Context to use for markup processing.
190 * \param[in] text Text to add.
192 * Works as addColumnLine(), except that it uses
193 * HelpWriterContext::substituteMarkupAndWrapToVector() to process
194 * markup in the input text instead of just wrapping it as plain text.
196 void addColumnHelpTextBlock(int index, const HelpWriterContext &context,
197 const std::string &text);
199 * Sets the first line to which text is printed for a column.
201 * \param[in] index Zero-based column index.
202 * \param[in] firstLine Zero-based line index from which to start the
205 * Can be called if there is no text for column \p index.
206 * Does not affect the output in this case.
210 void setColumnFirstLineOffset(int index, int firstLine);
212 * Formats the lines for the current row.
214 * \returns Current row formatted as a single string
215 * (contains newlines).
217 * Formats the data as set after the previous clear()/formatRow() using
218 * addColumnLine() and setColumnFirstLineOffset().
220 * If this is the first line to be formatted, a header is also added to
221 * the beginning of the returned string if any column has a title.
223 * The return value always terminates with a newline.
225 * Calls clear() on successful return.
227 std::string formatRow();
232 PrivateImplPointer<Impl> impl_;