text.c

nedit 是一款linux下的开发源码的功能强大的编辑器

static const char CVSID[] = "$Id: text.c,v 1.43.2.2 2003/08/13 16:22:15 edg Exp $";
/*******************************************************************************
*									       *
* text.c - Display text from a text buffer				       *
*									       *
* Copyright (C) 1999 Mark Edel						       *
*									       *
* This is free software; you can redistribute it and/or modify it under the    *
* terms of the GNU General Public License as published by the Free Software    *
* Foundation; either version 2 of the License, or (at your option) any later   *
* version.							               *
* 									       *
* This software is distributed in the hope that it will be useful, but WITHOUT *
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or        *
* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License        *
* for more details.							       *
* 									       *
* You should have received a copy of the GNU General Public License along with *
* software; if not, write to the Free Software Foundation, Inc., 59 Temple     *
* Place, Suite 330, Boston, MA  02111-1307 USA		                       *
*									       *
* Nirvana Text Editor	    						       *
* June 15, 1995								       *
*									       *
*******************************************************************************/

#ifdef HAVE_CONFIG_H
#include "../config.h"
#endif

#include "text.h"
#include "textP.h"
#include "textBuf.h"
#include "textDisp.h"
#include "textSel.h"
#include "textDrag.h"
#include "nedit.h"
#include "calltips.h"

#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <string.h>
#include <ctype.h>
#ifdef VMS
#include "../util/VMSparam.h"
#else
#ifndef __MVS__
#include <sys/param.h>
#endif
#endif /*VMS*/
#include <limits.h>

#include <X11/Intrinsic.h>
#include <X11/IntrinsicP.h>
#include <X11/StringDefs.h>
#include <X11/cursorfont.h>
#include <Xm/Xm.h>
#include <Xm/XmP.h>
#if XmVersion >= 1002
#include <Xm/PrimitiveP.h>
#endif

#ifdef HAVE_DEBUG_H
#include "../debug.h"
#endif


#ifdef UNICOS
#define XtOffset(p_type,field) ((size_t)__INTADDR__(&(((p_type)0)->field)))
#endif

/* Number of pixels of motion from the initial (grab-focus) button press
   required to begin recognizing a mouse drag for the purpose of making a
   selection */
#define SELECT_THRESHOLD 5

/* Length of delay in milliseconds for vertical autoscrolling */
#define VERTICAL_SCROLL_DELAY 50

static void initialize(TextWidget request, TextWidget new);
static void handleHidePointer(Widget w, XtPointer unused, 
        XEvent *event, Boolean *continue_to_dispatch);
static void handleShowPointer(Widget w, XtPointer unused, 
        XEvent *event, Boolean *continue_to_dispatch);
static void redisplay(TextWidget w, XEvent *event, Region region);
static void redisplayGE(TextWidget w, XtPointer client_data,
                    XEvent *event, Boolean *continue_to_dispatch_return);
static void destroy(TextWidget w);
static void resize(TextWidget w);
static Boolean setValues(TextWidget current, TextWidget request,
	TextWidget new);
static void realize(Widget w, XtValueMask *valueMask,
	XSetWindowAttributes *attributes);
static XtGeometryResult queryGeometry(Widget w, XtWidgetGeometry *proposed,
	XtWidgetGeometry *answer);
static void grabFocusAP(Widget w, XEvent *event, String *args,
	Cardinal *n_args);
static void moveDestinationAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void extendAdjustAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void extendStartAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void extendEndAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void processCancelAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void secondaryStartAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void secondaryOrDragStartAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void secondaryAdjustAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void secondaryOrDragAdjustAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void copyToAP(Widget w, XEvent *event, String *args, Cardinal *nArgs);
static void copyToOrEndDragAP(Widget w, XEvent *event, String *args,
    	Cardinal *nArgs);
static void copyPrimaryAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void cutPrimaryAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void moveToAP(Widget w, XEvent *event, String *args, Cardinal *nArgs);
static void moveToOrEndDragAP(Widget w, XEvent *event, String *args,
    	Cardinal *nArgs);
static void endDragAP(Widget w, XEvent *event, String *args, Cardinal *nArgs);
static void exchangeAP(Widget w, XEvent *event, String *args, Cardinal *nArgs);
static void mousePanAP(Widget w, XEvent *event, String *args, Cardinal *nArgs);
static void pasteClipboardAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void copyClipboardAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void cutClipboardAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void insertStringAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void selfInsertAP(Widget w, XEvent *event, String *args,
	Cardinal *n_args);
static void newlineAP(Widget w, XEvent *event, String *args, Cardinal *nArgs);
static void newlineAndIndentAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void newlineNoIndentAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void processTabAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void endOfLineAP(Widget w, XEvent *event, String *args, Cardinal *nArgs);
static void beginningOfLineAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void deleteSelectionAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void deletePreviousCharacterAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void deleteNextCharacterAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void deletePreviousWordAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void deleteNextWordAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void deleteToStartOfLineAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void deleteToEndOfLineAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void forwardCharacterAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void backwardCharacterAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void forwardWordAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void backwardWordAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void forwardParagraphAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void backwardParagraphAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void keySelectAP(Widget w, XEvent *event, String *args, Cardinal *nArgs);
static void processUpAP(Widget w, XEvent *event, String *args, Cardinal *nArgs);
static void processShiftUpAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void processDownAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void processShiftDownAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void beginningOfFileAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void endOfFileAP(Widget w, XEvent *event, String *args, Cardinal *nArgs);
static void nextPageAP(Widget w, XEvent *event, String *args, Cardinal *nArgs);
static void previousPageAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void pageLeftAP(Widget w, XEvent *event, String *args, Cardinal *nArgs);
static void pageRightAP(Widget w, XEvent *event, String *args, Cardinal *nArgs);
static void toggleOverstrikeAP(Widget w, XEvent *event, String *args,
    	Cardinal *nArgs);
static void scrollUpAP(Widget w, XEvent *event, String *args,
    	Cardinal *nArgs);
static void scrollDownAP(Widget w, XEvent *event, String *args,
    	Cardinal *nArgs);
static void scrollLeftAP(Widget w, XEvent *event, String *args,
    	Cardinal *nArgs);
static void scrollRightAP(Widget w, XEvent *event, String *args,
    	Cardinal *nArgs);
static void scrollToLineAP(Widget w, XEvent *event, String *args,
    	Cardinal *nArgs);
static void selectAllAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void deselectAllAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void focusInAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void focusOutAP(Widget w, XEvent *event, String *args,
	Cardinal *nArgs);
static void checkMoveSelectionChange(Widget w, XEvent *event, int startPos,
	String *args, Cardinal *nArgs);
static void keyMoveExtendSelection(Widget w, XEvent *event, int startPos,
	int rectangular);
static void checkAutoShowInsertPos(Widget w);
static int checkReadOnly(Widget w);
static void simpleInsertAtCursor(Widget w, char *chars, XEvent *event,
    	int allowPendingDelete);
static int pendingSelection(Widget w);
static int deletePendingSelection(Widget w, XEvent *event);
static int deleteEmulatedTab(Widget w, XEvent *event);
static void selectWord(Widget w, int pointerX);
static int spanForward(textBuffer *buf, int startPos, char *searchChars,
	int ignoreSpace, int *foundPos);
static int spanBackward(textBuffer *buf, int startPos, char *searchChars, int
    	ignoreSpace, int *foundPos);
static void selectLine(Widget w);
static int startOfWord(TextWidget w, int pos);
static int endOfWord(TextWidget w, int pos);
static void checkAutoScroll(TextWidget w, int x, int y);
static void endDrag(Widget w);
static void cancelDrag(Widget w);
static void callCursorMovementCBs(Widget w, XEvent *event);
static void adjustSelection(TextWidget tw, int x, int y);
static void adjustSecondarySelection(TextWidget tw, int x, int y);
static void autoScrollTimerProc(XtPointer clientData, XtIntervalId *id);
static char *wrapText(TextWidget tw, char *startLine, char *text, int bufOffset,
    	int wrapMargin, int *breakBefore);
static int wrapLine(TextWidget tw, textBuffer *buf, int bufOffset,
    	int lineStartPos, int lineEndPos, int limitPos, int *breakAt,
	int *charsAdded);
static char *createIndentString(TextWidget tw, textBuffer *buf, int bufOffset,
    	int lineStartPos, int lineEndPos, int *length, int *column);
static void cursorBlinkTimerProc(XtPointer clientData, XtIntervalId *id);
static int hasKey(const char *key, const String *args, const Cardinal *nArgs);
static int max(int i1, int i2);
static int min(int i1, int i2);
static int strCaseCmp(const char *str1, const char *str2);
static void ringIfNecessary(Boolean silent, Widget w);

static char defaultTranslations[] = 
    /* Backspace */
    "Ctrl<KeyPress>osfBackSpace: delete_previous_word()\n"
    "<KeyPress>osfBackSpace: delete_previous_character()\n"

    /* Delete */
    "Alt Shift Ctrl<KeyPress>osfDelete: cut_primary(\"rect\")\n"
    "Meta Shift Ctrl<KeyPress>osfDelete: cut_primary(\"rect\")\n"
    "Shift Ctrl<KeyPress>osfDelete: cut_primary()\n"
    "Ctrl<KeyPress>osfDelete: delete_to_end_of_line()\n"
    "Shift<KeyPress>osfDelete: cut_clipboard()\n"
    "<KeyPress>osfDelete: delete_next_character()\n"

    /* Insert */
    "Alt Shift Ctrl<KeyPress>osfInsert: copy_primary(\"rect\")\n"
    "Meta Shift Ctrl<KeyPress>osfInsert: copy_primary(\"rect\")\n"
    "Shift Ctrl<KeyPress>osfInsert: copy_primary()\n"
    "Shift<KeyPress>osfInsert: paste_clipboard()\n"
    "Ctrl<KeyPress>osfInsert: copy_clipboard()\n"
    "~Shift ~Ctrl<KeyPress>osfInsert: toggle_overstrike()\n"

    /* Cut/Copy/Paste */
    "Shift Ctrl<KeyPress>osfCut: cut_primary()\n"
    "<KeyPress>osfCut: cut_clipboard()\n"
    "<KeyPress>osfCopy: copy_clipboard()\n"
    "<KeyPress>osfPaste: paste_clipboard()\n"
    "<KeyPress>osfPrimaryPaste: copy_primary()\n"

    /* BeginLine */
    "Alt Shift Ctrl<KeyPress>osfBeginLine: beginning_of_file(\"extend\", \"rect\")\n"
    "Meta Shift Ctrl<KeyPress>osfBeginLine: beginning_of_file(\"extend\" \"rect\")\n"
    "Alt Shift<KeyPress>osfBeginLine: beginning_of_line(\"extend\", \"rect\")\n"
    "Meta Shift<KeyPress>osfBeginLine: beginning_of_line(\"extend\", \"rect\")\n"
    "Shift Ctrl<KeyPress>osfBeginLine: beginning_of_file(\"extend\")\n"
    "Ctrl<KeyPress>osfBeginLine: beginning_of_file()\n"
    "Shift<KeyPress>osfBeginLine: beginning_of_line(\"extend\")\n"
    "~Alt~Shift~Ctrl~Meta<KeyPress>osfBeginLine: beginning_of_line()\n"

    /* EndLine */
    "Alt Shift Ctrl<KeyPress>osfEndLine: end_of_file(\"extend\", \"rect\")\n"
    "Meta Shift Ctrl<KeyPress>osfEndLine: end_of_file(\"extend\", \"rect\")\n"
    "Alt Shift<KeyPress>osfEndLine: end_of_line(\"extend\", \"rect\")\n"
    "Meta Shift<KeyPress>osfEndLine: end_of_line(\"extend\", \"rect\")\n"
    "Shift Ctrl<KeyPress>osfEndLine: end_of_file(\"extend\")\n"
    "Ctrl<KeyPress>osfEndLine: end_of_file()\n"
    "Shift<KeyPress>osfEndLine: end_of_line(\"extend\")\n"
    "~Alt~Shift~Ctrl~Meta<KeyPress>osfEndLine: end_of_line()\n"

    /* Left */
    "Alt Shift Ctrl<KeyPress>osfLeft: backward_word(\"extend\", \"rect\")\n"
    "Meta Shift Ctrl<KeyPress>osfLeft: backward_word(\"extend\", \"rect\")\n"
    "Alt Shift<KeyPress>osfLeft: key_select(\"left\", \"rect\")\n"
    "Meta Shift<KeyPress>osfLeft: key_select(\"left\", \"rect\")\n"
    "Shift Ctrl<KeyPress>osfLeft: backward_word(\"extend\")\n"
    "Ctrl<KeyPress>osfLeft: backward_word()\n"
    "Shift<KeyPress>osfLeft: key_select(\"left\")\n"
    "~Alt~Shift~Ctrl~Meta<KeyPress>osfLeft: backward_character()\n"

    /* Right */
    "Alt Shift Ctrl<KeyPress>osfRight: forward_word(\"extend\", \"rect\")\n"
    "Meta Shift Ctrl<KeyPress>osfRight: forward_word(\"extend\", \"rect\")\n"
    "Alt Shift<KeyPress>osfRight: key_select(\"right\", \"rect\")\n"
    "Meta Shift<KeyPress>osfRight: key_select(\"right\", \"rect\")\n"
    "Shift Ctrl<KeyPress>osfRight: forward_word(\"extend\")\n"
    "Ctrl<KeyPress>osfRight: forward_word()\n"
    "Shift<KeyPress>osfRight: key_select(\"right\")\n"
    "~Alt~Shift~Ctrl~Meta<KeyPress>osfRight: forward_character()\n"

    /* Up */
    "Alt Shift Ctrl<KeyPress>osfUp: backward_paragraph(\"extend\", \"rect\")\n"
    "Meta Shift Ctrl<KeyPress>osfUp: backward_paragraph(\"extend\", \"rect\")\n"
    "Alt Shift<KeyPress>osfUp: process_shift_up(\"rect\")\n"
    "Meta Shift<KeyPress>osfUp: process_shift_up(\"rect\")\n"
    "Shift Ctrl<KeyPress>osfUp: backward_paragraph(\"extend\")\n"