frm_driver.c

ncurses 库 可能有用酒用 没用就算了 我觉得还可以用

/****************************************************************************
 * Copyright (c) 1998-2004,2005 Free Software Foundation, Inc.              *
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 * copies of the Software, and to permit persons to whom the Software is    *
 * furnished to do so, subject to the following conditions:                 *
 *                                                                          *
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 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
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/****************************************************************************
 *   Author:  Juergen Pfeifer, 1995,1997                                    *
 ****************************************************************************/

#include "form.priv.h"

MODULE_ID("$Id: frm_driver.c,v 1.71 2005/10/01 19:42:40 tom Exp $")

/*----------------------------------------------------------------------------
  This is the core module of the form library. It contains the majority
  of the driver routines as well as the form_driver function.

  Essentially this module is nearly the whole library. This is because
  all the functions in this module depends on some others in the module,
  so it makes no sense to split them into separate files because they
  will always be linked together. The only acceptable concern is turnaround
  time for this module, but now we have all Pentiums or RISCs, so what!

  The driver routines are grouped into nine generic categories:

   a)   Page Navigation            ( all functions prefixed by PN_ )
        The current page of the form is left and some new page is
        entered.
   b)   Inter-Field Navigation     ( all functions prefixed by FN_ )
        The current field of the form is left and some new field is
        entered.
   c)   Intra-Field Navigation     ( all functions prefixed by IFN_ )
        The current position in the current field is changed.
   d)   Vertical Scrolling         ( all functions prefixed by VSC_ )
        Essentially this is a specialization of Intra-Field navigation.
        It has to check for a multi-line field.
   e)   Horizontal Scrolling       ( all functions prefixed by HSC_ )
        Essentially this is a specialization of Intra-Field navigation.
        It has to check for a single-line field.
   f)   Field Editing              ( all functions prefixed by FE_ )
        The content of the current field is changed
   g)   Edit Mode requests         ( all functions prefixed by EM_ )
        Switching between insert and overlay mode
   h)   Field-Validation requests  ( all functions prefixed by FV_ )
        Perform verifications of the field.
   i)   Choice requests            ( all functions prefixed by CR_ )
        Requests to enumerate possible field values
  --------------------------------------------------------------------------*/

/*----------------------------------------------------------------------------
  Some remarks on the placements of assert() macros :
  I use them only on "strategic" places, i.e. top level entries where
  I want to make sure that things are set correctly. Throughout subordinate
  routines I omit them mostly.
  --------------------------------------------------------------------------*/

/*
Some options that may effect compatibility in behavior to SVr4 forms,
but they are here to allow a more intuitive and user friendly behavior of
our form implementation. This doesn't affect the API, so we feel it is
uncritical.

The initial implementation tries to stay very close with the behavior
of the original SVr4 implementation, although in some areas it is quite
clear that this isn't the most appropriate way. As far as possible this
sources will allow you to build a forms lib that behaves quite similar
to SVr4, but now and in the future we will give you better options.
Perhaps at some time we will make this configurable at runtime.
*/

/* Implement a more user-friendly previous/next word behavior */
#define FRIENDLY_PREV_NEXT_WORD (1)
/* Fix the wrong behavior for forms with all fields inactive */
#define FIX_FORM_INACTIVE_BUG (1)
/* Allow dynamic field growth also when navigating past the end */
#define GROW_IF_NAVIGATE (1)

#if USE_WIDEC_SUPPORT
#define myADDNSTR(w, s, n) wadd_wchnstr(w, s, n)
#define myINSNSTR(w, s, n) wins_wchnstr(w, s, n)
#define myINNSTR(w, s, n)  fix_wchnstr(w, s, n)
#define myWCWIDTH(w, y, x) cell_width(w, y, x)
#else
#define myADDNSTR(w, s, n) waddnstr(w, s, n)
#define myINSNSTR(w, s, n) winsnstr(w, s, n)
#define myINNSTR(w, s, n)  winnstr(w, s, n)
#define myWCWIDTH(w, y, x) 1
#endif

/*----------------------------------------------------------------------------
  Forward references to some internally used static functions
  --------------------------------------------------------------------------*/
static int Inter_Field_Navigation(int (*const fct) (FORM *), FORM *form);
static int FN_Next_Field(FORM *form);
static int FN_Previous_Field(FORM *form);
static int FE_New_Line(FORM *);
static int FE_Delete_Previous(FORM *);

/*----------------------------------------------------------------------------
  Macro Definitions.

  Some Remarks on that: I use the convention to use UPPERCASE for constants
  defined by Macros. If I provide a macro as a kind of inline routine to
  provide some logic, I use my Upper_Lower case style.
  --------------------------------------------------------------------------*/

/* Calculate the position of a single row in a field buffer */
#define Position_Of_Row_In_Buffer(field,row) ((row)*(field)->dcols)

/* Calculate start address for the fields buffer# N */
#define Address_Of_Nth_Buffer(field,N) \
  ((field)->buf + (N)*(1+Buffer_Length(field)))

/* Calculate the start address of the row in the fields specified buffer# N */
#define Address_Of_Row_In_Nth_Buffer(field,N,row) \
  (Address_Of_Nth_Buffer(field,N) + Position_Of_Row_In_Buffer(field,row))

/* Calculate the start address of the row in the fields primary buffer */
#define Address_Of_Row_In_Buffer(field,row) \
  Address_Of_Row_In_Nth_Buffer(field,0,row)

/* Calculate the start address of the row in the forms current field
   buffer# N */
#define Address_Of_Current_Row_In_Nth_Buffer(form,N) \
   Address_Of_Row_In_Nth_Buffer((form)->current,N,(form)->currow)

/* Calculate the start address of the row in the forms current field
   primary buffer */
#define Address_Of_Current_Row_In_Buffer(form) \
   Address_Of_Current_Row_In_Nth_Buffer(form,0)

/* Calculate the address of the cursor in the forms current field
   primary buffer */
#define Address_Of_Current_Position_In_Nth_Buffer(form,N) \
   (Address_Of_Current_Row_In_Nth_Buffer(form,N) + (form)->curcol)

/* Calculate the address of the cursor in the forms current field
   buffer# N */
#define Address_Of_Current_Position_In_Buffer(form) \
  Address_Of_Current_Position_In_Nth_Buffer(form,0)

/* Logic to decide whether or not a field is actually a field with
   vertical or horizontal scrolling */
#define Is_Scroll_Field(field)          \
   (((field)->drows > (field)->rows) || \
    ((field)->dcols > (field)->cols))

/* Logic to decide whether or not a field needs to have an individual window
   instead of a derived window because it contains invisible parts.
   This is true for non-public fields and for scrollable fields. */
#define Has_Invisible_Parts(field)     \
  (!((field)->opts & O_PUBLIC)      || \
   Is_Scroll_Field(field))

/* Logic to decide whether or not a field needs justification */
#define Justification_Allowed(field)        \
   (((field)->just != NO_JUSTIFICATION)  && \
    (Single_Line_Field(field))           && \
    (((field)->dcols == (field)->cols)   && \
    ((field)->opts & O_STATIC))             )

/* Logic to determine whether or not a dynamic field may still grow */
#define Growable(field) ((field)->status & _MAY_GROW)

/* Macro to set the attributes for a fields window */
#define Set_Field_Window_Attributes(field,win) \
(  wbkgdset((win),(chtype)((field)->pad | (field)->back)), \
   wattrset((win),(field)->fore) )

/* Logic to decide whether or not a field really appears on the form */
#define Field_Really_Appears(field)         \
  ((field->form)                          &&\
   (field->form->status & _POSTED)        &&\
   (field->opts & O_VISIBLE)              &&\
   (field->page == field->form->curpage))

/* Logic to determine whether or not we are on the first position in the
   current field */
#define First_Position_In_Current_Field(form) \
  (((form)->currow==0) && ((form)->curcol==0))

#define Minimum(a,b) (((a)<=(b)) ? (a) : (b))
#define Maximum(a,b) (((a)>=(b)) ? (a) : (b))

/*----------------------------------------------------------------------------
  Useful constants
  --------------------------------------------------------------------------*/
static FIELD_CELL myBLANK = BLANK;
static FIELD_CELL myZEROS;

#ifdef TRACE
static void
check_pos(FORM *form, int lineno)
{
  int y, x;

  if (form && form->w)
    {
      getyx(form->w, y, x);
      if (y != form->currow || x != form->curcol)
	{
	  T(("CHECKPOS %s@%d have position %d,%d vs want %d,%d",
	     __FILE__, lineno,
	     y, x,
	     form->currow, form->curcol));
	}
    }
}
#define CHECKPOS(form) check_pos(form, __LINE__)
#else
#define CHECKPOS(form)		/* nothing */
#endif

/*----------------------------------------------------------------------------
  Wide-character special functions
  --------------------------------------------------------------------------*/
#if USE_WIDEC_SUPPORT
/* like winsnstr */
static int
wins_wchnstr(WINDOW *w, cchar_t *s, int n)
{
  int code = ERR;
  int y, x;

  while (n-- > 0)
    {
      getyx(w, y, x);
      if ((code = wins_wch(w, s++)) != OK)
	break;
      if ((code = wmove(w, y, x + 1)) != OK)
	break;
    }
  return code;
}

/* win_wchnstr is inconsistent with winnstr, since it returns OK rather than
 * the number of items transferred.
 */
static int
fix_wchnstr(WINDOW *w, cchar_t *s, int n)
{
  win_wchnstr(w, s, n);
  return n;
}

/*
 * Returns the column of the base of the given cell.
 */
static int
cell_base(WINDOW *win, int y, int x)
{
  int result = x;

  while (LEGALYX(win, y, x))
    {
      cchar_t *data = &(win->_line[y].text[x]);

      if (isWidecBase(CHDEREF(data)) || !isWidecExt(CHDEREF(data)))
	{
	  result = x;
	  break;
	}
      --x;
    }
  return result;
}

/*
 * Returns the number of columns needed for the given cell in a window.
 */
static int
cell_width(WINDOW *win, int y, int x)
{
  int result = 1;

  if (LEGALYX(win, y, x))
    {
      cchar_t *data = &(win->_line[y].text[x]);

      if (isWidecExt(CHDEREF(data)))
	{
	  /* recur, providing the number of columns to the next character */
	  result = cell_width(win, y, x - 1);
	}
      else
	{
	  result = wcwidth(CharOf(CHDEREF(data)));
	}
    }
  return result;
}

/*
 * There is no wide-character function such as wdel_wch(), so we must find
 * all of the cells that comprise a multi-column character and delete them
 * one-by-one.
 */
static void
delete_char(FORM *form)
{
  int cells = cell_width(form->w, form->currow, form->curcol);

  form->curcol = cell_base(form->w, form->currow, form->curcol);
  wmove(form->w, form->currow, form->curcol);
  while (cells-- > 0)
    {
      wdelch(form->w);
    }
}
#define DeleteChar(form) delete_char(form)
#else
#define DeleteChar(form) \
	  wmove((form)->w, (form)->currow, (form)->curcol), \
	  wdelch((form)->w)
#endif

/*---------------------------------------------------------------------------
|   Facility      :  libnform
|   Function      :  static char *Get_Start_Of_Data(char * buf, int blen)
|
|   Description   :  Return pointer to first non-blank position in buffer.
|                    If buffer is empty return pointer to buffer itself.
|
|   Return Values :  Pointer to first non-blank position in buffer
+--------------------------------------------------------------------------*/
INLINE static FIELD_CELL *
Get_Start_Of_Data(FIELD_CELL *buf, int blen)
{
  FIELD_CELL *p = buf;
  FIELD_CELL *end = &buf[blen];

  assert(buf && blen >= 0);
  while ((p < end) && ISBLANK(*p))
    p++;
  return ((p == end) ? buf : p);
}

/*---------------------------------------------------------------------------
|   Facility      :  libnform
|   Function      :  static char *After_End_Of_Data(char * buf, int blen)
|
|   Description   :  Return pointer after last non-blank position in buffer.
|                    If buffer is empty, return pointer to buffer itself.
|
|   Return Values :  Pointer to position after last non-blank position in
|                    buffer.
+--------------------------------------------------------------------------*/
INLINE static FIELD_CELL *
After_End_Of_Data(FIELD_CELL *buf, int blen)
{
  FIELD_CELL *p = &buf[blen];

  assert(buf && blen >= 0);
  while ((p > buf) && ISBLANK(p[-1]))
    p--;
  return (p);
}

/*---------------------------------------------------------------------------
|   Facility      :  libnform
|   Function      :  static char *Get_First_Whitespace_Character(
|                                     char * buf, int   blen)
|
|   Description   :  Position to the first whitespace character.
|
|   Return Values :  Pointer to first whitespace character in buffer.
+--------------------------------------------------------------------------*/
INLINE static FIELD_CELL *
Get_First_Whitespace_Character(FIELD_CELL *buf, int blen)
{
  FIELD_CELL *p = buf;
  FIELD_CELL *end = &p[blen];

  assert(buf && blen >= 0);
  while ((p < end) && !ISBLANK(*p))
    p++;
  return ((p == end) ? buf : p);
}

/*---------------------------------------------------------------------------
|   Facility      :  libnform
|   Function      :  static char *After_Last_Whitespace_Character(
|                                     char * buf, int blen)
|
|   Description   :  Get the position after the last whitespace character.
|
|   Return Values :  Pointer to position after last whitespace character in
|                    buffer.
+--------------------------------------------------------------------------*/
INLINE static FIELD_CELL *
After_Last_Whitespace_Character(FIELD_CELL *buf, int blen)
{
  FIELD_CELL *p = &buf[blen];