mirror of https://github.com/fltk/fltk
reworked doxygen comments for Fl::arg() and Fl::args() - part 1
harmonised parameter names in Fl.H and Fl_arg.cxx and reworked doxygen comments to make them a bit clearer. More work required. git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@7729 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
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engelsman
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6
FL/Fl.H
6
FL/Fl.H
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@ -176,9 +176,9 @@ public:
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static double version();
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// argument parsers:
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static int arg(int, char**, int&);
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static int args(int, char**, int&, Fl_Args_Handler ah = 0);
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static void args(int, char**);
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static int arg(int argc, char **argv, int& i);
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static int args(int argc, char **argv, int& i, Fl_Args_Handler cb = 0);
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static void args(int argc, char **argv);
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/**
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Usage string displayed if Fl::args() detects an invalid argument.
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This may be changed to point to customized text at run-time.
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102
src/Fl_arg.cxx
102
src/Fl_arg.cxx
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@ -68,11 +68,14 @@ extern const char *fl_bg;
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extern const char *fl_bg2;
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/**
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Consume a single switch from argv, starting at word i.
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Parse a single switch from \p argv, starting at word \p i.
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Returns the number of words eaten (1 or 2, or 0 if it is not
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recognized) and adds the same value to i. You can use this
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function if you prefer to control the incrementing through the
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arguments yourself.
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recognized) and adds the same value to \p i.
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You can use this function if you prefer to control the incrementing
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through the standard FLTK switches yourself. If you want to handle
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additional switches, you will need to provide your own argument handler
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and pass it to Fl::args(int,char**,int&,Fl_Args_Handler) explicitly.
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*/
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int Fl::arg(int argc, char **argv, int &i) {
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arg_called = 1;
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@ -167,48 +170,51 @@ int Fl::arg(int argc, char **argv, int &i) {
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}
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/**
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Consume all switches from argv. Returns number of words eaten
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Returns zero on error. 'i' will either point at first word that
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does not start with '-', at the error word, or after a '--', or at
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argc. If your program does not take any word arguments you can
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report an error if i < argc.
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/**
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Parse command line switches using the \p cb argument handler.
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<P>FLTK provides an <I>entirely optional</I> command-line switch parser.
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You don't have to call it if you don't like them! Everything it can do
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can be done with other calls to FLTK.
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Returns 0 on error, or the number of words eaten.
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<P>To use the switch parser, call Fl::args(...) near the start
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of your program. This does <I>not</I> open the display, instead
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switches that need the display open are stashed into static variables.
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Then you <I>must</I> display your first window by calling
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window->show(argc,argv), which will do anything stored in the
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static variables.
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After the call returns, \p i will either point at the first word
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that does not start with '-', or the word that does not match a
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valid switch, or after a '--' denoting the end of the switches,
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or at \p argc. If your program does not take any additional
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arguments you can report an error if <tt>i < argc</tt>.
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<P>callback lets you define your own switches. It is called
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with the same argc and argv, and with i the
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index of each word. The callback should return zero if the switch is
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unrecognized, and not change i. It should return non-zero if
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the switch is recognized, and add at least 1 to i (it can add
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more to consume words after the switch). This function is called
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<i>before</i> any other tests, so <i>you can override any FLTK
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switch</i> (this is why FLTK can use very short switches instead of
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FLTK provides this as an <i>entirely optional</i> command line
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switch parser. You don't have to call it if you don't want to.
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Everything it can do can be done with other calls to FLTK
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To use the switch parser, call Fl::args(...) near the start
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of your program. This does \b not open the display, instead
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switches that need the display open are stashed into static
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variables. Then you \b must display your first window by calling
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<tt>window->show(argc,argv)</tt>, which will do anything stored
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in the static variables.
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The \p cb argument handler lets you define your own switches.
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It is called with the same \p argc and \p argv, and with \p i
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the index of each word. The \p cb handler should return zero
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if the switch is unrecognized, and not change \p i. It should
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return non-zero if the switch is recognized, and add at least
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1 to \p i (it can add more to consume words after the switch).
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This \p cb handler is called \i before any other tests, so
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<i>you can also override any standard FLTK switch</i>
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(this is why FLTK can use very short switches instead of
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the long ones all other toolkits force you to use).
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<P>On return i is set to the index of the first non-switch.
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On return \p i is set to the index of the first non-switch.
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This is either:
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<UL>
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<LI>The first word that does not start with '-'. </LI>
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<LI>The word '-' (used by many programs to name stdin as a file) </LI>
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<LI>The first unrecognized switch (return value is 0). </LI>
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<LI>argc</LI>
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</UL>
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- The first word that does not start with '-'.
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- The word '-' (used by many programs to name stdin as a file)
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- The first unrecognized switch (return value is 0).
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- \p argc
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<P>The return value is i unless an unrecognized switch is found,
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The return value is \p i unless an unrecognized switch is found,
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in which case it is zero. If your program takes no arguments other
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than switches you should produce an error if the return value is less
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than argc.
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than \p argc.
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<P>All switches except -bg2 may be abbreviated one letter and case is ignored:
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@ -268,13 +274,13 @@ int Fl::arg(int argc, char **argv, int &i) {
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</UL>
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<P>The second form of Fl::args() is useful if your program does
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not have command line switches of its own. It parses all the switches,
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and if any are not recognized it calls Fl::abort(Fl::help).
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<P>A usage string is displayed if Fl::args() detects an invalid
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argument on the command-line. You can change the message by setting the
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A usage string is displayed if Fl::args() detects an invalid argument
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on the command-line. You can change the message by setting the
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Fl::help pointer.
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The simpler Fl::args(int argc, char **argv) form is useful if your program
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does not have command line switches of its own. It parses all the switches,
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and if any are not recognized it calls Fl::abort(Fl::help).
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*/
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int Fl::args(int argc, char** argv, int& i, Fl_Args_Handler cb) {
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@ -387,7 +393,15 @@ static const char * const helpmsg =
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" -to[oltips]";
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const char * const Fl::help = helpmsg+13;
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/** See Fl::args(int argc, char **argv, int& i, int (*cb)(int,char**,int&)) */
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/**
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* Parse all command line switches matching standard FLTK options only.
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*
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* This calls Fl::args(int,char**,int&,Fl_Args_Handler) with the
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* argument handler set to the Fl::arg(int,char**,int&) function.
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*
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* Note: an unexpected switch will cause an error message and program exit.
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*/
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void Fl::args(int argc, char **argv) {
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int i; if (Fl::args(argc,argv,i) < argc) Fl::error(helpmsg);
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}
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