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| <html> | |
| <!-- Created on June, 4 2025 by texi2html 1.78a --> | |
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| <head> | |
| <title>GNU libtextstyle: 3. The programmer's perspective</title> | |
| <meta name="description" content="GNU libtextstyle: 3. The programmer's perspective"> | |
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| <table cellpadding="1" cellspacing="1" border="0"> | |
| <tr><td valign="middle" align="left">[<a href="libtextstyle_2.html#SEC4" title="Beginning of this chapter or previous chapter"> << </a>]</td> | |
| <td valign="middle" align="left">[<a href="libtextstyle_4.html#SEC38" title="Next chapter"> >> </a>]</td> | |
| <td valign="middle" align="left"> </td> | |
| <td valign="middle" align="left"> </td> | |
| <td valign="middle" align="left"> </td> | |
| <td valign="middle" align="left"> </td> | |
| <td valign="middle" align="left"> </td> | |
| <td valign="middle" align="left">[<a href="libtextstyle_toc.html#SEC_Top" title="Cover (top) of document">Top</a>]</td> | |
| <td valign="middle" align="left">[<a href="libtextstyle_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td> | |
| <td valign="middle" align="left">[<a href="libtextstyle_5.html#SEC46" title="Index">Index</a>]</td> | |
| <td valign="middle" align="left">[<a href="libtextstyle_abt.html#SEC_About" title="About (help)"> ? </a>]</td> | |
| </tr></table> | |
| <hr size="2"> | |
| <a name="The-programmer_0027s-view"></a> | |
| <a name="SEC15"></a> | |
| <h1 class="chapter"> <a href="libtextstyle_toc.html#TOC15">3. The programmer's perspective</a> </h1> | |
| <p>As a programmer, enabling styling consists of the following tasks: | |
| </p><ol> | |
| <li> | |
| Define the command-line options and environment variable that the user | |
| can use to control the styling. | |
| </li><li> | |
| Define the CSS classes that the user can use in the CSS file. Each CSS | |
| class corresponds to a text role; each CSS class can be given a different | |
| styling by the user. | |
| </li><li> | |
| Change the output routines so that they take an ‘<samp>ostream_t</samp>’ object | |
| as argument instead of a ‘<samp>FILE *</samp>’. | |
| </li><li> | |
| Insert paired invocations to <code>styled_ostream_begin_css_class</code>, | |
| <code>styled_ostream_end_css_class</code> around each run of text with a | |
| specific text role. | |
| </li><li> | |
| Link with <code>libtextstyle</code>. If your package is using GNU autoconf, | |
| you can use the <code>libtextstyle.m4</code> macro from Gnulib. | |
| </li><li> | |
| Prepare a default style file. | |
| </li><li> | |
| Update the documentation of your package. | |
| </li></ol> | |
| <p>The following sections go into more detail. | |
| </p> | |
| <a name="Basic-use"></a> | |
| <a name="SEC16"></a> | |
| <h2 class="section"> <a href="libtextstyle_toc.html#TOC16">3.1 Basic use of libtextstyle</a> </h2> | |
| <p>Source code that makes use of GNU libtextstyle needs an include statement: | |
| </p> | |
| <table><tr><td> </td><td><pre class="smallexample">#include <textstyle.h> | |
| </pre></td></tr></table> | |
| <p>Basic use of GNU libtextstyle consists of statements like these: | |
| </p> | |
| <table><tr><td> </td><td><pre class="smallexample"> styled_ostream_t stream = | |
| styled_ostream_create (STDOUT_FILENO, "(stdout)", TTYCTL_AUTO, | |
| style_file_name); | |
| ... | |
| styled_ostream_begin_use_class (stream, css_class); | |
| ... | |
| ostream_write_str (stream, string); | |
| ... | |
| styled_ostream_end_use_class (stream, css_class); | |
| ... | |
| styled_ostream_free (stream); | |
| </pre></td></tr></table> | |
| <p>Before this snippet, your code needs to determine the name of the style | |
| file to use (<code>style_file_name</code>). If no styling is desired – the | |
| precise condition depends on the value of <code>color_mode</code> but also on | |
| your application logic –, you should set <code>style_file_name</code> to | |
| <code>NULL</code>. | |
| </p> | |
| <p>An object of type <code>styled_ostream_t</code> is allocated. The function | |
| <code>styled_ostream_create</code> allocates it; the function | |
| <code>styled_ostream_free</code> deallocates it. | |
| </p> | |
| <p>Such <code>styled_ostream_t</code> supports output operations | |
| (<code>ostream_write_str</code>), interleaved with adding and removing CSS | |
| classes. The CSS class in effect when an output operation is performed | |
| determines, through the style file, the text attributes associated with | |
| that piece of text. | |
| </p> | |
| <a name="Hyperlinks"></a> | |
| <a name="SEC17"></a> | |
| <h3 class="subsection"> <a href="libtextstyle_toc.html#TOC17">3.1.1 Hyperlinks</a> </h3> | |
| <p>Text output may contain hyperlinks. These hyperlinks are encoded through | |
| an escape sequence, specified at | |
| <a href="https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda">Hyperlinks in terminal emulators</a>. Currently (as of 2024), they are | |
| displayed in many modern terminals, see | |
| <a href="https://github.com/Alhadis/OSC8-Adoption">OSC8-Adoption</a>. More | |
| terminal emulators will support hyperlinks in the future. Terminal | |
| emulators which don't support hyperlinks ignore it, except for a few | |
| terminal emulators, for which users may need to disable the hyperlinks | |
| (see <a href="libtextstyle_2.html#SEC9">The environment variable <code>NO_TERM_HYPERLINKS</code></a>) if the heuristic built into | |
| <code>libtextstyle</code> does not already disable them. | |
| </p> | |
| <p>To emit a hyperlink, use code like this: | |
| </p> | |
| <table><tr><td> </td><td><pre class="smallexample"> styled_ostream_t stream = ... | |
| ... | |
| /* Start a hyperlink. */ | |
| styled_ostream_set_hyperlink (stream, url, NULL); | |
| ... | |
| /* Emit the anchor text. This can be styled text. */ | |
| ostream_write_str (stream, "Click here!"); | |
| ... | |
| /* End the current hyperlink. */ | |
| styled_ostream_set_hyperlink (stream, NULL, NULL); | |
| </pre></td></tr></table> | |
| <p>The anchor text can be styled. But the hyperlinks themselves cannot be | |
| styled; they behave as implemented by the terminal emulator. | |
| </p> | |
| <a name="Include-files"></a> | |
| <a name="SEC18"></a> | |
| <h2 class="section"> <a href="libtextstyle_toc.html#TOC18">3.2 Include files</a> </h2> | |
| <p>The include file <code><textstyle.h></code> declares all facilities defined by | |
| the library. | |
| </p> | |
| <a name="Link-options"></a> | |
| <a name="SEC19"></a> | |
| <h2 class="section"> <a href="libtextstyle_toc.html#TOC19">3.3 Link options</a> </h2> | |
| <p>The library to link with is called <code>libtextstyle</code>, with a | |
| system-dependent suffix. You link with it though link options of the | |
| form <code>-ltextstyle</code> for a library installed in system locations, or | |
| <code>-L<var>libdir</var> -ltextstyle</code> for a static library installed in other | |
| locations, or <code>-L<var>libdir</var> -ltextstyle -Wl,-rpath,<var>libdir</var></code> | |
| for a shared library installed in other locations (assuming a GCC | |
| compatible compiler and linker and no <code>libtool</code>), or | |
| <code>-L<var>libdir</var> -ltextstyle -R<var>libdir</var></code> for a shared library | |
| installed in other locations (with <code>libtool</code>). Additionally, the | |
| link options may need to include the dependencies: <code>-lm</code>, and | |
| <code>-lncurses</code> or (on NetBSD) <code>-ltermcap</code> or (on AIX) | |
| <code>-lxcurses</code> or (on HP-UX) <code>-lcurses</code>, and on some systems also | |
| <code>-liconv</code>. | |
| </p> | |
| <p>It is a bit complicated to determine the right link options in a portable | |
| way. Therefore an Autoconf macro is provided in the file | |
| <code>libtextstyle.m4</code> in Gnulib, that makes this task easier. Assuming | |
| the build system of your package is based on GNU Autoconf, you invoke it | |
| through <code>gl_LIBTEXTSTYLE</code>. It searches for an installed | |
| <code>libtextstyle</code>. If found, it sets and AC_SUBSTs | |
| <code>HAVE_LIBTEXTSTYLE=yes</code> and the <code>LIBTEXTSTYLE</code> and | |
| <code>LTLIBTEXTSTYLE</code> variables, and augments the <code>CPPFLAGS</code> | |
| variable, and #defines <code>HAVE_LIBTEXTSTYLE</code> to 1. Otherwise, it sets | |
| and AC_SUBSTs <code>HAVE_LIBTEXTSTYLE=no</code> and <code>LIBTEXTSTYLE</code> and | |
| <code>LTLIBTEXTSTYLE</code> to empty. In link commands that use <code>libtool</code>, | |
| use <code>LTLIBTEXTSTYLE</code>; in link commands that don't use <code>libtool</code>, | |
| use <code>LIBTEXTSTYLE</code>. | |
| </p> | |
| <p>If you use GNU Automake, the proper place to use the link options is | |
| <code><var>program</var>_LDADD</code> for programs and <code><var>library</var>_LIBADD</code> | |
| for libraries. | |
| </p> | |
| <a name="Command_002dline-options"></a> | |
| <a name="SEC20"></a> | |
| <h2 class="section"> <a href="libtextstyle_toc.html#TOC20">3.4 Command-line options</a> </h2> | |
| <p>While you are free to provide any command-line option to enable the | |
| styling of the output, it is good if different GNU programs use the same | |
| command-line options for this purpose. These options are described in | |
| the sections <a href="libtextstyle_2.html#SEC11">The <code>--color</code> option</a> and <a href="libtextstyle_2.html#SEC12">The <code>--style</code> option</a>. To | |
| achieve this, use the following API (declared in <code><textstyle.h></code>): | |
| </p> | |
| <dl> | |
| <dt><u>Variable:</u> bool <b>color_test_mode</b> | |
| <a name="IDX1"></a> | |
| </dt> | |
| <dd><p>True if a <code>--color</code> option with value <code>test</code> has been seen. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Variable:</u> enum color_option <b>color_mode</b> | |
| <a name="IDX2"></a> | |
| </dt> | |
| <dd><p>Stores the value of the <code>--color</code> option. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Variable:</u> const char * <b>style_file_name</b> | |
| <a name="IDX3"></a> | |
| </dt> | |
| <dd><p>Stores the value of the <code>--style</code> option. | |
| </p></dd></dl> | |
| <p>Note: These variables, like any variables exported from shared libraries, | |
| can only be used in executable code. You <em>cannot</em> portably use | |
| their address in initializers of global or static variables. This is a | |
| restriction that is imposed by the Windows, Cygwin, and Android platforms. | |
| </p> | |
| <dl> | |
| <dt><u>Function:</u> bool <b>handle_color_option</b><i> (const char *<var>option</var>)</i> | |
| <a name="IDX4"></a> | |
| </dt> | |
| <dd><p>You invoke this function when, during argument parsing, you have | |
| encountered a <code>--color</code> or <code>--color=...</code> option. The return | |
| value is an error indicator: <code>true</code> means an invalid option. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> void <b>handle_style_option</b><i> (const char *<var>option</var>)</i> | |
| <a name="IDX5"></a> | |
| </dt> | |
| <dd><p>You invoke this function when, during argument parsing, you have | |
| encountered a <code>--style</code> or <code>--style=...</code> option. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> void <b>print_color_test</b><i> (void)</i> | |
| <a name="IDX6"></a> | |
| </dt> | |
| <dd><p>Prints a color test page. You invoke this function after argument | |
| parsing, when the <code>color_test_mode</code> variable is true. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> void <b>style_file_prepare</b><i> (const char *<var>style_file_envvar</var>, const char *<var>stylesdir_envvar</var>, const char *<var>stylesdir_after_install</var>, const char *<var>default_style_file</var>)</i> | |
| <a name="IDX7"></a> | |
| </dt> | |
| <dd><p>Assigns a default value to <code>style_file_name</code> if necessary. You | |
| invoke this function after argument parsing, when <code>color_test_mode</code> | |
| is false. | |
| </p> | |
| <p><code><var>style_file_envvar</var></code> is an environment variable that, when set | |
| to a non-empty value, specifies the style file to use. This environment | |
| variable is meant to be set by the user. | |
| </p> | |
| <p><code><var>stylesdir_envvar</var></code> is an environment variable that, when set | |
| to a non-empty value, specifies the directory with the style files, or | |
| <code>NULL</code>. This is necessary for running the testsuite before | |
| ‘<samp>make install</samp>’. | |
| </p> | |
| <p><code><var>stylesdir_after_install</var></code> is the directory with the style | |
| files after ‘<samp>make install</samp>’. | |
| </p> | |
| <p><code><var>default_style_file</var></code> is the file name of the default style | |
| file, relative to <var>stylesdir</var>. | |
| </p></dd></dl> | |
| <a name="The-output-stream-hierarchy"></a> | |
| <a name="SEC21"></a> | |
| <h2 class="section"> <a href="libtextstyle_toc.html#TOC21">3.5 The output stream hierarchy</a> </h2> | |
| <p>There are various classes of output streams, some of them with styling | |
| support. These “classes” are defined in an object-oriented programming | |
| style that resembles C++ or Java, but are actually implemented in C with | |
| a little bit of object orientation syntax. These definitions are | |
| preprocessed down to C. As a consequence, GNU libtextstyle is a C | |
| library and does not need to link with the C++ standard library. | |
| </p> | |
| <p>All these classes are declared in <code><textstyle.h></code>. | |
| </p> | |
| <p>The base output stream type is ‘<samp>ostream_t</samp>’. It is a pointer type to | |
| a (hidden) implementation type. Similarly for the subclasses. | |
| </p> | |
| <p>When we say that ‘<samp>some_ostream_t</samp>’ is a subclass of ‘<samp>ostream_t</samp>’, | |
| what we mean is: | |
| </p><ul> | |
| <li> | |
| Every ‘<samp>some_ostream_t</samp>’ object can be converted to an | |
| ‘<samp>ostream_t</samp>’, by virtue of a simple assignment. No cast is needed. | |
| </li><li> | |
| The opposite conversion, from ‘<samp>ostream_t</samp>’ to ‘<samp>some_ostream_t</samp>’, | |
| can also be performed, provided that the object is actually an instance | |
| of ‘<samp>some_ostream_t</samp>’. You can test whether an object is an instance | |
| of ‘<samp>some_ostream_t</samp>’ by invoking the method | |
| ‘<samp>bool is_instance_of_some_ostream (ostream_t stream)</samp>’. | |
| <a name="IDX8"></a> | |
| <a name="IDX9"></a> | |
| <a name="IDX10"></a> | |
| <a name="IDX11"></a> | |
| <a name="IDX12"></a> | |
| <a name="IDX13"></a> | |
| <a name="IDX14"></a> | |
| <a name="IDX15"></a> | |
| <a name="IDX16"></a> | |
| <a name="IDX17"></a> | |
| </li><li> | |
| Every method ‘<samp>ostream_<var>foobar</var></samp>’ exists also as a method | |
| ‘<samp>some_ostream_<var>foobar</var></samp>’ with compatible argument types and a | |
| compatible return type. | |
| </li></ul> | |
| <a name="The-ostream-class"></a> | |
| <a name="SEC22"></a> | |
| <h3 class="subsection"> <a href="libtextstyle_toc.html#TOC22">3.5.1 The abstract <code>ostream</code> class</a> </h3> | |
| <p>The base output stream type is ‘<samp>ostream_t</samp>’. | |
| </p> | |
| <p>It has the following methods: | |
| </p> | |
| <dl> | |
| <dt><u>Function:</u> void <b>ostream_write_mem</b><i> (ostream_t <var>stream</var>, const void *<var>data</var>, size_t <var>len</var>)</i> | |
| <a name="IDX18"></a> | |
| </dt> | |
| <dd><p>Writes a sequence of bytes to a stream. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> void <b>ostream_write_str</b><i> (ostream_t <var>stream</var>, const char *<var>string</var>)</i> | |
| <a name="IDX19"></a> | |
| </dt> | |
| <dd><p>Writes a string's contents to a stream. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> ptrdiff_t <b>ostream_printf</b><i> (ostream_t <var>stream</var>, const char *<var>format</var>, ...)</i> | |
| <a name="IDX20"></a> | |
| </dt> | |
| <dt><u>Function:</u> ptrdiff_t <b>ostream_vprintf</b><i> (ostream_t <var>stream</var>, const char *<var>format</var>, va_list args)</i> | |
| <a name="IDX21"></a> | |
| </dt> | |
| <dd><p>Writes formatted output to a stream. | |
| </p> | |
| <p>These functions return the size of formatted output, or a negative value | |
| in case of an error. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> void <b>ostream_flush</b><i> (ostream_t <var>stream</var>, ostream_flush_scope_t <var>scope</var>)</i> | |
| <a name="IDX22"></a> | |
| </dt> | |
| <dd><p>Brings buffered data to its destination. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> void <b>ostream_free</b><i> (ostream_t <var>stream</var>)</i> | |
| <a name="IDX23"></a> | |
| </dt> | |
| <dd><p>Closes and frees a stream. | |
| </p></dd></dl> | |
| <a name="The-styled_005fostream-class"></a> | |
| <a name="SEC23"></a> | |
| <h3 class="subsection"> <a href="libtextstyle_toc.html#TOC23">3.5.2 The abstract <code>styled_ostream</code> class</a> </h3> | |
| <p>The type for a styled output stream is ‘<samp>styled_ostream_t</samp>’. It is a | |
| subclass of ‘<samp>ostream_t</samp>’ that adds the following methods: | |
| </p> | |
| <dl> | |
| <dt><u>Function:</u> void <b>styled_ostream_begin_use_class</b><i> (styled_ostream_t <var>stream</var>, const char *<var>classname</var>)</i> | |
| <a name="IDX24"></a> | |
| </dt> | |
| <dd><p>Starts a run of text belonging to <code><var>classname</var></code>. The | |
| <code><var>classname</var></code> is the name of a CSS class. It can be chosen | |
| arbitrarily and customized through the CSS file. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> void <b>styled_ostream_end_use_class</b><i> (styled_ostream_t <var>stream</var>, const char *<var>classname</var>)</i> | |
| <a name="IDX25"></a> | |
| </dt> | |
| <dd><p>Ends a run of text belonging to <code><var>classname</var></code>. The | |
| <code>styled_ostream_begin_use_class</code> / | |
| <code>styled_ostream_end_use_class</code> calls must match properly. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> const char * <b>styled_ostream_get_hyperlink_ref</b><i> (styled_ostream_t <var>stream</var>)</i> | |
| <a name="IDX26"></a> | |
| </dt> | |
| <dd><p>Returns the referred URL of the currently set hyperlink, or <code>NULL</code> | |
| if no hyperlink attribute is currently set. | |
| </p> | |
| <p>Note: The returned string is only valid up to the next invocation of | |
| <code>styled_ostream_set_hyperlink</code>. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> const char * <b>styled_ostream_get_hyperlink_id</b><i> (styled_ostream_t <var>stream</var>)</i> | |
| <a name="IDX27"></a> | |
| </dt> | |
| <dd><p>Returns the id of the currently set hyperlink, or <code>NULL</code> if no | |
| hyperlink attribute is currently set. | |
| </p> | |
| <p>Note: The returned string is only valid up to the next invocation of | |
| <code>styled_ostream_set_hyperlink</code>. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> void <b>styled_ostream_set_hyperlink</b><i> (styled_ostream_t <var>stream</var>, const char *<var>ref</var>, const char *<var>id</var>)</i> | |
| <a name="IDX28"></a> | |
| </dt> | |
| <dd><p>Sets or removes a hyperlink attribute. | |
| </p> | |
| <p>To set a hyperlink attribute, pass a non-<code>NULL</code> <var>ref</var>. | |
| <var>ref</var> is an URL; it should be at most 2083 bytes long. Non-ASCII | |
| characters should be URI-escaped (using the %nn syntax). <var>id</var> is | |
| an optional identifier. On terminal output, multiple hyperlinks with | |
| the same <var>id</var> will be highlighted together. If specified, <var>id</var> | |
| should be at most 250 bytes long. | |
| </p> | |
| <p>To remove a hyperlink attribute, pass <code>NULL</code> for <var>ref</var> and <var>id</var>. | |
| </p> | |
| <p>Hyperlinks don't nest. That is, a hyperlink attribute is enabled only | |
| up to the next invocation of <code>styled_ostream_set_hyperlink</code>. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> void <b>styled_ostream_flush_to_current_style</b><i> (styled_ostream_t <var>stream</var>)</i> | |
| <a name="IDX29"></a> | |
| </dt> | |
| <dd><p>This function acts like <code>ostream_flush (<var>stream</var>, FLUSH_THIS_STREAM)</code>, | |
| except that it leaves the destination with the current text style enabled, | |
| instead of with the default text style. | |
| </p> | |
| <p>After calling this function, you can output strings without newlines(!) to the | |
| underlying stream, and they will be rendered like strings passed to | |
| <code>ostream_write_mem</code>, <code>ostream_write_str</code>, or <code>ostream_printf</code>. | |
| </p></dd></dl> | |
| <a name="ostream-subclasses-without-styling"></a> | |
| <a name="SEC24"></a> | |
| <h3 class="subsection"> <a href="libtextstyle_toc.html#TOC24">3.5.3 Concrete ostream subclasses without styling</a> </h3> | |
| <a name="The-file_005fostream-class"></a> | |
| <a name="SEC25"></a> | |
| <h4 class="subsubsection"> <a href="libtextstyle_toc.html#TOC25">3.5.3.1 The <code>file_ostream</code> class</a> </h4> | |
| <p>The <code>file_ostream</code> class supports output to an <code><stdio.h></code> | |
| <code>FILE</code> stream. Its type is ‘<samp>file_ostream_t</samp>’. It is a subclass | |
| of ‘<samp>ostream_t</samp>’ that adds no methods. | |
| </p> | |
| <p>It can be instantiated through this function: | |
| </p> | |
| <dl> | |
| <dt><u>Function:</u> file_ostream_t <b>file_ostream_create</b><i> (FILE *<var>fp</var>)</i> | |
| <a name="IDX30"></a> | |
| </dt> | |
| <dd><p>Creates an output stream referring to <code><var>fp</var></code>. | |
| </p> | |
| <p>Note: The resulting stream must be closed before <code><var>fp</var></code> can be | |
| closed. | |
| </p></dd></dl> | |
| <a name="The-fd_005fostream-class"></a> | |
| <a name="SEC26"></a> | |
| <h4 class="subsubsection"> <a href="libtextstyle_toc.html#TOC26">3.5.3.2 The <code>fd_ostream</code> class</a> </h4> | |
| <p>The <code>file_ostream</code> class supports output to a file descriptor. Its | |
| type is ‘<samp>fd_ostream_t</samp>’. It is a subclass of ‘<samp>ostream_t</samp>’ that | |
| adds no methods. | |
| </p> | |
| <p>It can be instantiated through this function: | |
| </p> | |
| <dl> | |
| <dt><u>Function:</u> fd_ostream_t <b>fd_ostream_create</b><i> (int <var>fd</var>, const char *<var>filename</var>, bool <var>buffered</var>)</i> | |
| <a name="IDX31"></a> | |
| </dt> | |
| <dd><p>Creates an output stream referring to the file descriptor <code><var>fd</var></code>. | |
| </p> | |
| <p><code><var>filename</var></code> is used only for error messages. | |
| </p> | |
| <p>Note: The resulting stream must be closed before <code><var>fd</var></code> can be | |
| closed. | |
| </p></dd></dl> | |
| <a name="The-term_005fostream-class"></a> | |
| <a name="SEC27"></a> | |
| <h4 class="subsubsection"> <a href="libtextstyle_toc.html#TOC27">3.5.3.3 The <code>term_ostream</code> class</a> </h4> | |
| <p>The <code>term_ostream</code> class supports output to a file descriptor that | |
| is connected to a terminal emulator or console. Its type is | |
| ‘<samp>term_ostream_t</samp>’. It is a subclass of ‘<samp>ostream_t</samp>’. | |
| </p> | |
| <p>It can be instantiated through this function: | |
| </p> | |
| <dl> | |
| <dt><u>Function:</u> term_ostream_t <b>term_ostream_create</b><i> (int <var>fd</var>, const char *<var>filename</var>, ttyctl_t <var>tty_control</var>)</i> | |
| <a name="IDX32"></a> | |
| </dt> | |
| <dd><p>Creates an output stream referring to the file descriptor <code><var>fd</var></code>. | |
| </p> | |
| <p><code><var>filename</var></code> is used only for error messages. | |
| </p> | |
| <p><code><var>tty_control</var></code> specifies the amount of control to take over the | |
| underlying tty. | |
| </p> | |
| <p>The resulting stream will be line-buffered. | |
| </p> | |
| <p>Note: The resulting stream must be closed before <code><var>fd</var></code> can be | |
| closed. | |
| </p></dd></dl> | |
| <p>The class adds the following methods: | |
| </p> | |
| <dl> | |
| <dt><u>Function:</u> term_color_t <b>term_ostream_rgb_to_color</b><i> (term_ostream_t <var>stream</var>, int <var>red</var>, int <var>green</var>, int <var>blue</var>)</i> | |
| <a name="IDX33"></a> | |
| </dt> | |
| <dd><p>Converts an RGB value | |
| (<code><var>red</var></code>, <code><var>green</var></code>, <code><var>blue</var></code> in [0..255]) to | |
| a color, valid for this stream only. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> term_color_t <b>term_ostream_get_color</b><i> (term_ostream_t <var>stream</var>)</i> | |
| <a name="IDX34"></a> | |
| </dt> | |
| <dt><u>Function:</u> void <b>term_ostream_set_color</b><i> (term_ostream_t <var>stream</var>, term_color_t <var>color</var>)</i> | |
| <a name="IDX35"></a> | |
| </dt> | |
| <dd><p>Gets/sets the text color. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> term_color_t <b>term_ostream_get_bgcolor</b><i> (term_ostream_t <var>stream</var>)</i> | |
| <a name="IDX36"></a> | |
| </dt> | |
| <dt><u>Function:</u> void <b>term_ostream_set_bgcolor</b><i> (term_ostream_t <var>stream</var>, term_color_t <var>color</var>)</i> | |
| <a name="IDX37"></a> | |
| </dt> | |
| <dd><p>Gets/sets the background color. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> term_weight_t <b>term_ostream_get_weight</b><i> (term_ostream_t <var>stream</var>)</i> | |
| <a name="IDX38"></a> | |
| </dt> | |
| <dt><u>Function:</u> void <b>term_ostream_set_weight</b><i> (term_ostream_t <var>stream</var>, term_weight_t <var>weight</var>)</i> | |
| <a name="IDX39"></a> | |
| </dt> | |
| <dd><p>Gets/sets the font weight. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> term_posture_t <b>term_ostream_get_posture</b><i> (term_ostream_t <var>stream</var>)</i> | |
| <a name="IDX40"></a> | |
| </dt> | |
| <dt><u>Function:</u> void <b>term_ostream_set_posture</b><i> (term_ostream_t <var>stream</var>, term_posture_t <var>posture</var>)</i> | |
| <a name="IDX41"></a> | |
| </dt> | |
| <dd><p>Gets/sets the font posture. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> term_underline_t <b>term_ostream_get_underline</b><i> (term_ostream_t <var>stream</var>)</i> | |
| <a name="IDX42"></a> | |
| </dt> | |
| <dt><u>Function:</u> void <b>term_ostream_set_underline</b><i> (term_ostream_t <var>stream</var>, term_underline_t <var>underline</var>)</i> | |
| <a name="IDX43"></a> | |
| </dt> | |
| <dd><p>Gets/sets the text underline decoration. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> const char * <b>term_ostream_get_hyperlink_ref</b><i> (term_ostream_t <var>stream</var>)</i> | |
| <a name="IDX44"></a> | |
| </dt> | |
| <dd><p>Returns the referred URL of the currently set hyperlink, or <code>NULL</code> | |
| if no hyperlink attribute is currently set. | |
| </p> | |
| <p>Note: The returned string is only valid up to the next invocation of | |
| <code>term_ostream_set_hyperlink</code>. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> const char * <b>term_ostream_get_hyperlink_id</b><i> (term_ostream_t <var>stream</var>)</i> | |
| <a name="IDX45"></a> | |
| </dt> | |
| <dd><p>Returns the id of the currently set hyperlink, or <code>NULL</code> if no | |
| hyperlink attribute is currently set. | |
| </p> | |
| <p>Note: The returned string is only valid up to the next invocation of | |
| <code>term_ostream_set_hyperlink</code>. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> void <b>term_ostream_set_hyperlink</b><i> (term_ostream_t <var>stream</var>, const char *<var>ref</var>, const char *<var>id</var>)</i> | |
| <a name="IDX46"></a> | |
| </dt> | |
| <dd><p>Sets or removes a hyperlink attribute. | |
| </p> | |
| <p>To set a hyperlink attribute, pass a non-<code>NULL</code> <var>ref</var>. | |
| <var>ref</var> is an URL; it should be at most 2083 bytes long. Non-ASCII | |
| characters should be URI-escaped (using the %nn syntax). <var>id</var> is | |
| an optional identifier. Multiple hyperlinks with the same <var>id</var> | |
| will be highlighted together. If specified, <var>id</var> should be at most | |
| 250 bytes long. | |
| </p> | |
| <p>To remove a hyperlink attribute, pass <code>NULL</code> for <var>ref</var> and <var>id</var>. | |
| </p> | |
| <p>Hyperlinks don't nest. That is, a hyperlink attribute is enabled only | |
| up to the next invocation of <code>styled_ostream_set_hyperlink</code>. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> void <b>term_ostream_flush_to_current_style</b><i> (term_ostream_t <var>stream</var>)</i> | |
| <a name="IDX47"></a> | |
| </dt> | |
| <dd><p>This function acts like <code>ostream_flush (<var>stream</var>, FLUSH_THIS_STREAM)</code>, | |
| except that it leaves the terminal with the current text attributes enabled, | |
| instead of with the default text attributes. | |
| </p> | |
| <p>After calling this function, you can output strings without newlines(!) to the | |
| underlying file descriptor, and they will be rendered like strings passed to | |
| <code>ostream_write_mem</code>, <code>ostream_write_str</code>, or <code>ostream_printf</code>. | |
| </p></dd></dl> | |
| <a name="The-html_005fostream-class"></a> | |
| <a name="SEC28"></a> | |
| <h4 class="subsubsection"> <a href="libtextstyle_toc.html#TOC28">3.5.3.4 The <code>html_ostream</code> class</a> </h4> | |
| <p>The <code>html_ostream</code> class supports output to any destination, in HTML | |
| syntax. Its type is ‘<samp>html_ostream_t</samp>’. It is a subclass of | |
| ‘<samp>ostream_t</samp>’. | |
| </p> | |
| <p>It can be instantiated through this function: | |
| </p> | |
| <dl> | |
| <dt><u>Function:</u> html_ostream_t <b>html_ostream_create</b><i> (ostream_t <var>destination</var>)</i> | |
| <a name="IDX48"></a> | |
| </dt> | |
| <dd><p>Creates an output stream that takes input in the UTF-8 encoding and | |
| writes it in HTML form on <code><var>destination</var></code>. | |
| </p> | |
| <p>This stream produces a sequence of lines. The caller is responsible for | |
| opening the <code><body><html></code> elements before and for closing them | |
| after the use of this stream. | |
| </p> | |
| <p>Note: The resulting stream must be closed before <code><var>destination</var></code> | |
| can be closed. | |
| </p></dd></dl> | |
| <p>The class adds the following methods: | |
| </p> | |
| <dl> | |
| <dt><u>Function:</u> void <b>html_ostream_begin_span</b><i> (html_ostream_t <var>stream</var>, const char *<var>classname</var>)</i> | |
| <a name="IDX49"></a> | |
| </dt> | |
| <dd><p>Starts a <code><span class="<var>classname</var>"></code> element. The | |
| <code><var>classname</var></code> is the name of a CSS class. It can be chosen | |
| arbitrarily and customized through the CSS file. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> void <b>html_ostream_end_span</b><i> (html_ostream_t <var>stream</var>, const char *<var>classname</var>)</i> | |
| <a name="IDX50"></a> | |
| </dt> | |
| <dd><p>Ends a <code><span class="<var>classname</var>"></code> element. | |
| </p> | |
| <p>The <code>html_ostream_begin_span</code> / <code>html_ostream_end_span</code> calls | |
| must match properly. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> const char * <b>html_ostream_get_hyperlink_ref</b><i> (html_ostream_t <var>stream</var>)</i> | |
| <a name="IDX51"></a> | |
| </dt> | |
| <dd><p>Returns the referred URL of the currently set hyperlink, or <code>NULL</code> | |
| if no hyperlink attribute is currently set. | |
| </p> | |
| <p>Note: The returned string is only valid up to the next invocation of | |
| <code>html_ostream_set_hyperlink_ref</code>. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> void <b>html_ostream_set_hyperlink_ref</b><i> (html_ostream_t <var>stream</var>, const char *<var>ref</var>)</i> | |
| <a name="IDX52"></a> | |
| </dt> | |
| <dd><p>Sets or removes a hyperlink attribute. | |
| </p> | |
| <p>To set a hyperlink attribute, pass a non-<code>NULL</code> <var>ref</var>. | |
| <var>ref</var> is an URL; it should be at most 2083 bytes long. Non-ASCII | |
| characters should be URI-escaped (using the %nn syntax). | |
| </p> | |
| <p>To remove a hyperlink attribute, pass <code>NULL</code> for <var>ref</var>. | |
| </p> | |
| <p>Hyperlinks don't nest. That is, a hyperlink attribute is enabled only | |
| up to the next invocation of <code>html_ostream_set_hyperlink_ref</code>. | |
| </p></dd></dl> | |
| <dl> | |
| <dt><u>Function:</u> void <b>html_ostream_flush_to_current_style</b><i> (html_ostream_t <var>stream</var>)</i> | |
| <a name="IDX53"></a> | |
| </dt> | |
| <dd><p>This function acts like <code>ostream_flush (<var>stream</var>, FLUSH_THIS_STREAM)</code>, | |
| except that it leaves the destination with the current text style enabled, | |
| instead of with the default text style. | |
| </p> | |
| <p>After calling this function, you can output strings without newlines(!) to the | |
| underlying stream, and they will be rendered like strings passed to | |
| <code>ostream_write_mem</code>, <code>ostream_write_str</code>, or <code>ostream_printf</code>. | |
| </p></dd></dl> | |
| <a name="The-memory_005fostream-class"></a> | |
| <a name="SEC29"></a> | |
| <h4 class="subsubsection"> <a href="libtextstyle_toc.html#TOC29">3.5.3.5 The <code>memory_ostream</code> class</a> </h4> | |
| <p>The <code>memory_ostream</code> class supports output to an in-memory buffer. | |
| Its type is ‘<samp>memory_ostream_t</samp>’. It is a subclass of | |
| ‘<samp>ostream_t</samp>’. | |
| </p> | |
| <p>It can be instantiated through this function: | |
| </p> | |
| <dl> | |
| <dt><u>Function:</u> memory_ostream_t <b>memory_ostream_create</b><i> (void)</i> | |
| <a name="IDX54"></a> | |
| </dt> | |
| <dd><p>Creates an output stream that accumulates the output in a memory buffer. | |
| </p></dd></dl> | |
| <p>The class adds the following method: | |
| </p> | |
| <dl> | |
| <dt><u>Function:</u> void <b>memory_ostream_contents</b><i> (memory_ostream_t <var>stream</var>, const void **<var>bufp</var>, size_t *<var>buflenp</var>)</i> | |
| <a name="IDX55"></a> | |
| </dt> | |
| <dd><p>Returns a pointer to the output accumulated so far and its size. It | |
| stores them in <code>*<var>bufp</var></code> and <code>*<var>buflenp</var></code>, respectively. | |
| </p> | |
| <p>Note: These two return values become invalid when more output is done to | |
| the stream or when the stream is freed. | |
| </p></dd></dl> | |
| <a name="The-iconv_005fostream-class"></a> | |
| <a name="SEC30"></a> | |
| <h4 class="subsubsection"> <a href="libtextstyle_toc.html#TOC30">3.5.3.6 The <code>iconv_ostream</code> class</a> </h4> | |
| <p>The <code>iconv_ostream</code> class supports output to any destination. Its | |
| type is ‘<samp>iconv_ostream_t</samp>’. It is a subclass of ‘<samp>ostream_t</samp>’ | |
| that adds no methods. | |
| </p> | |
| <p>It can be instantiated through this function: | |
| </p> | |
| <dl> | |
| <dt><u>Function:</u> iconv_ostream_t <b>iconv_ostream_create</b><i> (const char *<var>from_encoding</var>, const char *<var>to_encoding</var>, ostream_t <var>destination</var>)</i> | |
| <a name="IDX56"></a> | |
| </dt> | |
| <dd><p>Creates an output stream that converts from <code><var>from_encoding</var></code> to | |
| <code><var>to_encoding</var></code>, writing the result to <code><var>destination</var></code>. | |
| </p> | |
| <p>Note: The resulting stream must be closed before <code><var>destination</var></code> | |
| can be closed. | |
| </p></dd></dl> | |
| <a name="styled_005fostream-subclasses"></a> | |
| <a name="SEC31"></a> | |
| <h3 class="subsection"> <a href="libtextstyle_toc.html#TOC31">3.5.4 Concrete <code>styled_ostream</code> subclasses</a> </h3> | |
| <a name="The-term_005fstyled_005fostream-class"></a> | |
| <a name="SEC32"></a> | |
| <h4 class="subsubsection"> <a href="libtextstyle_toc.html#TOC32">3.5.4.1 The <code>term_styled_ostream</code> class</a> </h4> | |
| <p>The <code>term_styled_ostream</code> class supports styled output to a file | |
| descriptor that is connected to a terminal emulator or console. Its type | |
| is ‘<samp>term_styled_ostream_t</samp>’. It is a subclass of | |
| ‘<samp>styled_ostream_t</samp>’. | |
| </p> | |
| <p>It can be instantiated through this function: | |
| </p> | |
| <dl> | |
| <dt><u>Function:</u> term_styled_ostream_t <b>term_styled_ostream_create</b><i> (int <var>fd</var>, const char *<var>filename</var>, ttyctl_t <var>tty_control</var>, const char *<var>css_filename</var>)</i> | |
| <a name="IDX57"></a> | |
| </dt> | |
| <dd><p>Creates an output stream referring to the file descriptor <code><var>fd</var></code>, | |
| styled with the file <code><var>css_filename</var></code>. | |
| </p> | |
| <p><code><var>filename</var></code> is used only for error messages. | |
| </p> | |
| <p><code><var>tty_control</var></code> specifies the amount of control to take over the | |
| underlying tty. | |
| </p> | |
| <p>Note: The resulting stream must be closed before <code><var>fd</var></code> can be | |
| closed. | |
| </p> | |
| <p>Returns <code>NULL</code> upon failure. | |
| </p></dd></dl> | |
| <p>The following is a variant of this function. Upon failure, it does not | |
| return <code>NULL</code>; instead, it returns a styled <code>fd_stream</code> on | |
| which the styling operations exist but are no-ops. | |
| </p> | |
| <dl> | |
| <dt><u>Function:</u> styled_ostream_t <b>styled_ostream_create</b><i> (int <var>fd</var>, const char *<var>filename</var>, ttyctl_t <var>tty_control</var>, const char *<var>css_filename</var>)</i> | |
| <a name="IDX58"></a> | |
| </dt> | |
| <dd><p>Creates an output stream referring to the file descriptor <code><var>fd</var></code>, | |
| styled with the file <code><var>css_filename</var></code> if possible. | |
| </p> | |
| <p><code><var>filename</var></code> is used only for error messages. | |
| </p> | |
| <p><code><var>tty_control</var></code> specifies the amount of control to take over the | |
| underlying tty. | |
| </p> | |
| <p>Note: The resulting stream must be closed before <code><var>fd</var></code> can be | |
| closed. | |
| </p></dd></dl> | |
| <a name="The-html_005fstyled_005fostream-class"></a> | |
| <a name="SEC33"></a> | |
| <h4 class="subsubsection"> <a href="libtextstyle_toc.html#TOC33">3.5.4.2 The <code>html_styled_ostream</code> class</a> </h4> | |
| <p>The <code>html_styled_ostream</code> class supports styled output to any | |
| destination, in HTML syntax. Its type is ‘<samp>html_styled_ostream_t</samp>’. | |
| It is a subclass of ‘<samp>styled_ostream_t</samp>’. | |
| </p> | |
| <p>It can be instantiated through this function: | |
| </p> | |
| <dl> | |
| <dt><u>Function:</u> html_styled_ostream_t <b>html_styled_ostream_create</b><i> (ostream_t <var>destination</var>, const char *<var>css_filename</var>)</i> | |
| <a name="IDX59"></a> | |
| </dt> | |
| <dd><p>Creates an output stream that takes input in the UTF-8 encoding and | |
| writes it in HTML form on <code><var>destination</var></code>, styled with the file | |
| <code><var>css_filename</var></code>. | |
| </p> | |
| <p>Note: The resulting stream must be closed before <code><var>destination</var></code> | |
| can be closed. | |
| </p></dd></dl> | |
| <a name="The-noop_005fstyled_005fostream-class"></a> | |
| <a name="SEC34"></a> | |
| <h4 class="subsubsection"> <a href="libtextstyle_toc.html#TOC34">3.5.4.3 The <code>noop_styled_ostream</code> class</a> </h4> | |
| <p>The <code>noop_styled_ostream</code> class supports the styled output operations | |
| to any destination. The text is output to the given destination; the | |
| styling operations, however, do nothing. Its type is | |
| ‘<samp>noop_styled_ostream_t</samp>’. It is a subclass of ‘<samp>styled_ostream_t</samp>’. | |
| </p> | |
| <p>It can be instantiated through this function: | |
| </p> | |
| <dl> | |
| <dt><u>Function:</u> noop_styled_ostream_t <b>noop_styled_ostream_create</b><i> (ostream_t <var>destination</var>, bool <var>pass_ownership</var>)</i> | |
| <a name="IDX60"></a> | |
| </dt> | |
| <dd><p>Creates an output stream that delegates to <code><var>destination</var></code> and | |
| that supports the styling operations as no-ops. | |
| </p> | |
| <p>If <code><var>pass_ownership</var></code> is <code>true</code>, closing the resulting | |
| stream will automatically close the <code><var>destination</var></code>. | |
| </p> | |
| <p>Note: If <code><var>pass_ownership</var></code> is <code>false</code>, the resulting stream | |
| must be closed before <code><var>destination</var></code> can be closed. | |
| </p></dd></dl> | |
| <a name="Accessors"></a> | |
| <a name="SEC35"></a> | |
| <h3 class="subsection"> <a href="libtextstyle_toc.html#TOC35">3.5.5 Accessor functions</a> </h3> | |
| <p>The various concrete stream classes have methods that allow you to retrieve | |
| the arguments passed to the respective constructor function. | |
| </p> | |
| <p>Note: While these methods allow you to retrieve the underlying destination | |
| stream of various kinds of stream, it is not recommended to operate on both | |
| the stream and its underlying destination stream at the same time. Doing | |
| so can lead to undesired interactions between the two streams. | |
| </p> | |
| <p>The <code>file_ostream</code> class has this accessor method: | |
| </p> | |
| <dl> | |
| <dt><u>Function:</u> FILE * <b>file_ostream_get_stdio_stream</b><i> (file_ostream_t <var>stream</var>)</i> | |
| <a name="IDX61"></a> | |
| </dt> | |
| </dl> | |
| <p>The <code>fd_ostream</code> class has these accessor methods: | |
| </p> | |
| <dl> | |
| <dt><u>Function:</u> int <b>fd_ostream_get_descriptor</b><i> (fd_ostream_t <var>stream</var>)</i> | |
| <a name="IDX62"></a> | |
| </dt> | |
| </dl> | |
| <dl> | |
| <dt><u>Function:</u> const char * <b>fd_ostream_get_filename</b><i> (fd_ostream_t <var>stream</var>)</i> | |
| <a name="IDX63"></a> | |
| </dt> | |
| </dl> | |
| <dl> | |
| <dt><u>Function:</u> bool <b>fd_ostream_is_buffered</b><i> (fd_ostream_t <var>stream</var>)</i> | |
| <a name="IDX64"></a> | |
| </dt> | |
| </dl> | |
| <p>The <code>term_ostream</code> class has these accessor methods: | |
| </p> | |
| <dl> | |
| <dt><u>Function:</u> int <b>term_ostream_get_descriptor</b><i> (term_ostream_t <var>stream</var>)</i> | |
| <a name="IDX65"></a> | |
| </dt> | |
| </dl> | |
| <dl> | |
| <dt><u>Function:</u> const char * <b>term_ostream_get_filename</b><i> (term_ostream_t <var>stream</var>)</i> | |
| <a name="IDX66"></a> | |
| </dt> | |
| </dl> | |
| <dl> | |
| <dt><u>Function:</u> ttyctl_t <b>term_ostream_get_tty_control</b><i> (term_ostream_t <var>stream</var>)</i> | |
| <a name="IDX67"></a> | |
| </dt> | |
| </dl> | |
| <dl> | |
| <dt><u>Function:</u> ttyctl_t <b>term_ostream_get_effective_tty_control</b><i> (term_ostream_t <var>stream</var>)</i> | |
| <a name="IDX68"></a> | |
| </dt> | |
| <dd><p>Returns the effective tty control of the stream (not <code>TTYCTL_AUTO</code>). | |
| </p></dd></dl> | |
| <p>The <code>iconv_ostream</code> class has these accessor methods: | |
| </p> | |
| <dl> | |
| <dt><u>Function:</u> const char * <b>iconv_ostream_get_from_encoding</b><i> (iconv_ostream_t <var>stream</var>)</i> | |
| <a name="IDX69"></a> | |
| </dt> | |
| </dl> | |
| <dl> | |
| <dt><u>Function:</u> const char * <b>iconv_ostream_get_to_encoding</b><i> (iconv_ostream_t <var>stream</var>)</i> | |
| <a name="IDX70"></a> | |
| </dt> | |
| </dl> | |
| <dl> | |
| <dt><u>Function:</u> ostream_t <b>iconv_ostream_get_destination</b><i> (iconv_ostream_t <var>stream</var>)</i> | |
| <a name="IDX71"></a> | |
| </dt> | |
| </dl> | |
| <p>The <code>html_ostream</code> class has this accessor method: | |
| </p> | |
| <dl> | |
| <dt><u>Function:</u> ostream_t <b>html_ostream_get_destination</b><i> (html_ostream_t <var>stream</var>)</i> | |
| <a name="IDX72"></a> | |
| </dt> | |
| </dl> | |
| <p>The <code>term_styled_ostream</code> class has these accessor methods: | |
| </p> | |
| <dl> | |
| <dt><u>Function:</u> term_ostream_t <b>term_styled_ostream_get_destination</b><i> (term_styled_ostream_t <var>stream</var>)</i> | |
| <a name="IDX73"></a> | |
| </dt> | |
| </dl> | |
| <dl> | |
| <dt><u>Function:</u> const char * <b>term_styled_ostream_get_css_filename</b><i> (term_styled_ostream_t <var>stream</var>)</i> | |
| <a name="IDX74"></a> | |
| </dt> | |
| </dl> | |
| <p>The <code>html_styled_ostream</code> class has these accessor methods: | |
| </p> | |
| <dl> | |
| <dt><u>Function:</u> ostream_t <b>html_styled_ostream_get_destination</b><i> (html_styled_ostream_t <var>stream</var>)</i> | |
| <a name="IDX75"></a> | |
| </dt> | |
| </dl> | |
| <dl> | |
| <dt><u>Function:</u> html_ostream_t <b>html_styled_ostream_get_html_destination</b><i> (html_styled_ostream_t <var>stream</var>)</i> | |
| <a name="IDX76"></a> | |
| </dt> | |
| </dl> | |
| <dl> | |
| <dt><u>Function:</u> const char * <b>html_styled_ostream_get_css_filename</b><i> (html_styled_ostream_t <var>stream</var>)</i> | |
| <a name="IDX77"></a> | |
| </dt> | |
| </dl> | |
| <p>The <code>noop_styled_ostream</code> class has these accessor methods: | |
| </p> | |
| <dl> | |
| <dt><u>Function:</u> ostream_t <b>noop_styled_ostream_get_destination</b><i> (noop_styled_ostream_t <var>stream</var>)</i> | |
| <a name="IDX78"></a> | |
| </dt> | |
| </dl> | |
| <dl> | |
| <dt><u>Function:</u> bool <b>noop_styled_ostream_is_owning_destination</b><i> (noop_styled_ostream_t <var>stream</var>)</i> | |
| <a name="IDX79"></a> | |
| </dt> | |
| </dl> | |
| <a name="Debugging-the-styling-code"></a> | |
| <a name="SEC36"></a> | |
| <h2 class="section"> <a href="libtextstyle_toc.html#TOC36">3.6 Debugging the text styling support</a> </h2> | |
| <p>If you want to understand which output of your program is associated with | |
| which CSS classes, the simplest way is as follows: | |
| </p> | |
| <ol> | |
| <li> | |
| Run the program with the command-line option <code>--color=html</code>, | |
| redirecting the output to a file. | |
| </li><li> | |
| Then inspect this output. Text regions associated with a CSS class are | |
| surrounded by <code><span class="<var>css-class</var>"></code>...<code></span></code>. | |
| </li></ol> | |
| <a name="What-to-document"></a> | |
| <a name="SEC37"></a> | |
| <h2 class="section"> <a href="libtextstyle_toc.html#TOC37">3.7 Documenting the text styling support</a> </h2> | |
| <p>To make the text styling support available to the end user of your | |
| package, the following need to be documented: | |
| </p><ul> | |
| <li> | |
| The command-line options. This typically needs to be done in several | |
| places: in the ‘<samp>--help</samp>’ output, in the <code>man</code> pages (if present), | |
| and in the documentation. | |
| </li><li> | |
| Which programs support ‘<samp>--color=test</samp>’? | |
| </li><li> | |
| The list of CSS classes and their meaning. This is necessary, so that | |
| the user can create their own style file; the CSS classes are part of the | |
| selectors in the CSS rules. | |
| </li><li> | |
| The location of the default style file. This is a convenience, so that | |
| the user, when creating their own style file, can start from the default | |
| one. | |
| </li><li> | |
| The environment variable, called <code><var>style_file_envvar</var></code> above, | |
| that, when set to a non-empty value, specifies the style file to use. | |
| </li></ul> | |
| <table cellpadding="1" cellspacing="1" border="0"> | |
| <tr><td valign="middle" align="left">[<a href="#SEC15" title="Beginning of this chapter or previous chapter"> << </a>]</td> | |
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| <td valign="middle" align="left"> </td> | |
| <td valign="middle" align="left"> </td> | |
| <td valign="middle" align="left"> </td> | |
| <td valign="middle" align="left"> </td> | |
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| <td valign="middle" align="left">[<a href="libtextstyle_toc.html#SEC_Top" title="Cover (top) of document">Top</a>]</td> | |
| <td valign="middle" align="left">[<a href="libtextstyle_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td> | |
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| <td valign="middle" align="left">[<a href="libtextstyle_abt.html#SEC_About" title="About (help)"> ? </a>]</td> | |
| </tr></table> | |
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