/* * tkTextIndex.c -- * * This module provides functions that manipulate indices for text * widgets. * * Copyright (c) 1992-1994 The Regents of the University of California. * Copyright (c) 1994-1997 Sun Microsystems, Inc. * * See the file "license.terms" for information on usage and redistribution of * this file, and for a DISCLAIMER OF ALL WARRANTIES. */ #include "default.h" #include "tkInt.h" #include "tkText.h" /* * Index to use to select last character in line (very large integer): */ #define LAST_CHAR 1000000 /* * Modifiers for index parsing: 'display', 'any' or nothing. */ #define TKINDEX_NONE 0 #define TKINDEX_DISPLAY 1 #define TKINDEX_ANY 2 /* * Forward declarations for functions defined later in this file: */ static CONST char * ForwBack(TkText *textPtr, CONST char *string, TkTextIndex *indexPtr); static CONST char * StartEnd(TkText *textPtr, CONST char *string, TkTextIndex *indexPtr); static int GetIndex(Tcl_Interp *interp, TkSharedText *sharedPtr, TkText *textPtr, CONST char *string, TkTextIndex *indexPtr, int *canCachePtr); static int IndexCountBytesOrdered(CONST TkText *textPtr, CONST TkTextIndex *indexPtr1, CONST TkTextIndex *indexPtr2); /* * The "textindex" Tcl_Obj definition: */ static void DupTextIndexInternalRep(Tcl_Obj *srcPtr, Tcl_Obj *copyPtr); static void FreeTextIndexInternalRep(Tcl_Obj *listPtr); static int SetTextIndexFromAny(Tcl_Interp *interp, Tcl_Obj *objPtr); static void UpdateStringOfTextIndex(Tcl_Obj *objPtr); /* * Accessor macros for the "textindex" type. */ #define GET_TEXTINDEX(objPtr) \ ((TkTextIndex *) (objPtr)->internalRep.twoPtrValue.ptr1) #define GET_INDEXEPOCH(objPtr) \ (PTR2INT((objPtr)->internalRep.twoPtrValue.ptr2)) #define SET_TEXTINDEX(objPtr, indexPtr) \ ((objPtr)->internalRep.twoPtrValue.ptr1 = (VOID *) (indexPtr)) #define SET_INDEXEPOCH(objPtr, epoch) \ ((objPtr)->internalRep.twoPtrValue.ptr2 = INT2PTR(epoch)) /* * Define the 'textindex' object type, which Tk uses to represent indices in * text widgets internally. */ Tcl_ObjType tkTextIndexType = { "textindex", /* name */ FreeTextIndexInternalRep, /* freeIntRepProc */ DupTextIndexInternalRep, /* dupIntRepProc */ NULL, /* updateStringProc */ SetTextIndexFromAny /* setFromAnyProc */ }; static void FreeTextIndexInternalRep( Tcl_Obj *indexObjPtr) /* TextIndex object with internal rep to * free. */ { TkTextIndex *indexPtr = GET_TEXTINDEX(indexObjPtr); if (indexPtr->textPtr != NULL) { if (--indexPtr->textPtr->refCount == 0) { /* * The text widget has been deleted and we need to free it now. */ ckfree((char *) (indexPtr->textPtr)); } } ckfree((char *) indexPtr); } static void DupTextIndexInternalRep( Tcl_Obj *srcPtr, /* TextIndex obj with internal rep to copy. */ Tcl_Obj *copyPtr) /* TextIndex obj with internal rep to set. */ { int epoch; TkTextIndex *dupIndexPtr, *indexPtr; dupIndexPtr = (TkTextIndex *) ckalloc(sizeof(TkTextIndex)); indexPtr = GET_TEXTINDEX(srcPtr); epoch = GET_INDEXEPOCH(srcPtr); dupIndexPtr->tree = indexPtr->tree; dupIndexPtr->linePtr = indexPtr->linePtr; dupIndexPtr->byteIndex = indexPtr->byteIndex; dupIndexPtr->textPtr = indexPtr->textPtr; if (dupIndexPtr->textPtr != NULL) { dupIndexPtr->textPtr->refCount++; } SET_TEXTINDEX(copyPtr, dupIndexPtr); SET_INDEXEPOCH(copyPtr, epoch); copyPtr->typePtr = &tkTextIndexType; } /* * This will not be called except by TkTextNewIndexObj below. This is because * if a TkTextIndex is no longer valid, it is not possible to regenerate the * string representation. */ static void UpdateStringOfTextIndex( Tcl_Obj *objPtr) { char buffer[TK_POS_CHARS]; register int len; CONST TkTextIndex *indexPtr = GET_TEXTINDEX(objPtr); len = TkTextPrintIndex(indexPtr->textPtr, indexPtr, buffer); objPtr->bytes = ckalloc((unsigned) len + 1); strcpy(objPtr->bytes, buffer); objPtr->length = len; } static int SetTextIndexFromAny( Tcl_Interp *interp, /* Used for error reporting if not NULL. */ Tcl_Obj *objPtr) /* The object to convert. */ { Tcl_AppendToObj(Tcl_GetObjResult(interp), "can't convert value to textindex except via TkTextGetIndexFromObj API", -1); return TCL_ERROR; } /* *--------------------------------------------------------------------------- * * MakeObjIndex -- * * This function generates a Tcl_Obj description of an index, suitable * for reading in again later. If the 'textPtr' is NULL then we still * generate an index object, but it's internal description is deemed * non-cacheable, and therefore effectively useless (apart from as a * temporary memory storage). This is used for indices whose meaning is * very temporary (like @0,0 or the name of a mark or tag). The mapping * from such strings/objects to actual TkTextIndex pointers is not stable * to minor text widget changes which we do not track (we track * insertions and deletions). * * Results: * A pointer to an allocated TkTextIndex which will be freed * automatically when the Tcl_Obj is used for other purposes. * * Side effects: * A small amount of memory is allocated. * *--------------------------------------------------------------------------- */ static TkTextIndex * MakeObjIndex( TkText *textPtr, /* Information about text widget. */ Tcl_Obj *objPtr, /* Object containing description of * position. */ CONST TkTextIndex *origPtr) /* Pointer to index. */ { TkTextIndex *indexPtr = (TkTextIndex *) ckalloc(sizeof(TkTextIndex)); indexPtr->tree = origPtr->tree; indexPtr->linePtr = origPtr->linePtr; indexPtr->byteIndex = origPtr->byteIndex; SET_TEXTINDEX(objPtr, indexPtr); objPtr->typePtr = &tkTextIndexType; indexPtr->textPtr = textPtr; if (textPtr != NULL) { textPtr->refCount++; SET_INDEXEPOCH(objPtr, textPtr->sharedTextPtr->stateEpoch); } else { SET_INDEXEPOCH(objPtr, 0); } return indexPtr; } CONST TkTextIndex * TkTextGetIndexFromObj( Tcl_Interp *interp, /* Use this for error reporting. */ TkText *textPtr, /* Information about text widget. */ Tcl_Obj *objPtr) /* Object containing description of * position. */ { TkTextIndex index; TkTextIndex *indexPtr = NULL; int cache; if (objPtr->typePtr == &tkTextIndexType) { int epoch; indexPtr = GET_TEXTINDEX(objPtr); epoch = GET_INDEXEPOCH(objPtr); if (epoch == textPtr->sharedTextPtr->stateEpoch) { if (indexPtr->textPtr == textPtr) { return indexPtr; } } } /* * The object is either not an index type or referred to a different text * widget, or referred to the correct widget, but it is out of date (text * has been added/deleted since). */ if (GetIndex(interp, NULL, textPtr, Tcl_GetString(objPtr), &index, &cache) != TCL_OK) { return NULL; } if (objPtr->typePtr != NULL) { if (objPtr->bytes == NULL) { objPtr->typePtr->updateStringProc(objPtr); } if ((objPtr->typePtr->freeIntRepProc) != NULL) { (*objPtr->typePtr->freeIntRepProc)(objPtr); } } return MakeObjIndex((cache ? textPtr : NULL), objPtr, &index); } /* *--------------------------------------------------------------------------- * * TkTextNewIndexObj -- * * This function generates a Tcl_Obj description of an index, suitable * for reading in again later. The index generated is effectively stable * to all except insertion/deletion operations on the widget. * * Results: * A new Tcl_Obj with refCount zero. * * Side effects: * A small amount of memory is allocated. * *--------------------------------------------------------------------------- */ Tcl_Obj * TkTextNewIndexObj( TkText *textPtr, /* Text widget for this index */ CONST TkTextIndex *indexPtr)/* Pointer to index. */ { Tcl_Obj *retVal; retVal = Tcl_NewObj(); retVal->bytes = NULL; /* * Assumption that the above call returns an object with: * retVal->typePtr == NULL */ MakeObjIndex(textPtr, retVal, indexPtr); /* * Unfortunately, it isn't possible for us to regenerate the string * representation so we have to create it here, while we can be sure the * contents of the index are still valid. */ UpdateStringOfTextIndex(retVal); return retVal; } /* *--------------------------------------------------------------------------- * * TkTextMakePixelIndex -- * * Given a pixel index and a byte index, look things up in the B-tree and * fill in a TkTextIndex structure. * * The valid input range for pixelIndex is from 0 to the number of pixels * in the widget-1. Anything outside that range will be rounded to the * closest acceptable value. * * Results: * * The structure at *indexPtr is filled in with information about the * character at pixelIndex (or the closest existing character, if the * specified one doesn't exist), and the number of excess pixels is * returned as a result. This means if the given pixel index is exactly * correct for the top-edge of the indexPtr, then zero will be returned, * and otherwise we will return the calculation 'desired pixelIndex' - * 'actual pixel index of indexPtr'. * * Side effects: * None. * *--------------------------------------------------------------------------- */ int TkTextMakePixelIndex( TkText *textPtr, /* The Text Widget */ int pixelIndex, /* Pixel-index of desired line (0 means first * pixel of first line of text). */ TkTextIndex *indexPtr) /* Structure to fill in. */ { int pixelOffset = 0; indexPtr->tree = textPtr->sharedTextPtr->tree; indexPtr->textPtr = textPtr; if (pixelIndex < 0) { pixelIndex = 0; } indexPtr->linePtr = TkBTreeFindPixelLine(textPtr->sharedTextPtr->tree, textPtr, pixelIndex, &pixelOffset); /* * 'pixelIndex' was too large, so we try again, just to find the last * pixel in the window. */ if (indexPtr->linePtr == NULL) { int lastMinusOne = TkBTreeNumPixels(textPtr->sharedTextPtr->tree, textPtr)-1; indexPtr->linePtr = TkBTreeFindPixelLine(textPtr->sharedTextPtr->tree, textPtr, lastMinusOne, &pixelOffset); indexPtr->byteIndex = 0; return pixelOffset; } indexPtr->byteIndex = 0; if (pixelOffset <= 0) { return 0; } return TkTextMeasureDown(textPtr, indexPtr, pixelOffset); } /* *--------------------------------------------------------------------------- * * TkTextMakeByteIndex -- * * Given a line index and a byte index, look things up in the B-tree and * fill in a TkTextIndex structure. * * Results: * The structure at *indexPtr is filled in with information about the * character at lineIndex and byteIndex (or the closest existing * character, if the specified one doesn't exist), and indexPtr is * returned as result. * * Side effects: * None. * *--------------------------------------------------------------------------- */ TkTextIndex * TkTextMakeByteIndex( TkTextBTree tree, /* Tree that lineIndex and byteIndex refer * to. */ CONST TkText *textPtr, int lineIndex, /* Index of desired line (0 means first line * of text). */ int byteIndex, /* Byte index of desired character. */ TkTextIndex *indexPtr) /* Structure to fill in. */ { TkTextSegment *segPtr; int index; CONST char *p, *start; Tcl_UniChar ch; indexPtr->tree = tree; if (lineIndex < 0) { lineIndex = 0; byteIndex = 0; } if (byteIndex < 0) { byteIndex = 0; } indexPtr->linePtr = TkBTreeFindLine(tree, textPtr, lineIndex); if (indexPtr->linePtr == NULL) { indexPtr->linePtr = TkBTreeFindLine(tree, textPtr, TkBTreeNumLines(tree, textPtr)); byteIndex = 0; } if (byteIndex == 0) { indexPtr->byteIndex = byteIndex; return indexPtr; } /* * Verify that the index is within the range of the line and points to a * valid character boundary. */ index = 0; for (segPtr = indexPtr->linePtr->segPtr; ; segPtr = segPtr->nextPtr) { if (segPtr == NULL) { /* * Use the index of the last character in the line. Since the last * character on the line is guaranteed to be a '\n', we can back * up a constant sizeof(char) bytes. */ indexPtr->byteIndex = index - sizeof(char); break; } if (index + segPtr->size > byteIndex) { indexPtr->byteIndex = byteIndex; if ((byteIndex > index) && (segPtr->typePtr == &tkTextCharType)) { /* * Prevent UTF-8 character from being split up by ensuring * that byteIndex falls on a character boundary. If index * falls in the middle of a UTF-8 character, it will be * adjusted to the end of that UTF-8 character. */ start = segPtr->body.chars + (byteIndex - index); p = Tcl_UtfPrev(start, segPtr->body.chars); p += Tcl_UtfToUniChar(p, &ch); indexPtr->byteIndex += p - start; } break; } index += segPtr->size; } return indexPtr; } /* *--------------------------------------------------------------------------- * * TkTextMakeCharIndex -- * * Given a line index and a character index, look things up in the B-tree * and fill in a TkTextIndex structure. * * Results: * The structure at *indexPtr is filled in with information about the * character at lineIndex and charIndex (or the closest existing * character, if the specified one doesn't exist), and indexPtr is * returned as result. * * Side effects: * None. * *--------------------------------------------------------------------------- */ TkTextIndex * TkTextMakeCharIndex( TkTextBTree tree, /* Tree that lineIndex and charIndex refer * to. */ TkText *textPtr, int lineIndex, /* Index of desired line (0 means first line * of text). */ int charIndex, /* Index of desired character. */ TkTextIndex *indexPtr) /* Structure to fill in. */ { register TkTextSegment *segPtr; char *p, *start, *end; int index, offset; Tcl_UniChar ch; indexPtr->tree = tree; if (lineIndex < 0) { lineIndex = 0; charIndex = 0; } if (charIndex < 0) { charIndex = 0; } indexPtr->linePtr = TkBTreeFindLine(tree, textPtr, lineIndex); if (indexPtr->linePtr == NULL) { indexPtr->linePtr = TkBTreeFindLine(tree, textPtr, TkBTreeNumLines(tree, textPtr)); charIndex = 0; } /* * Verify that the index is within the range of the line. If not, just use * the index of the last character in the line. */ index = 0; for (segPtr = indexPtr->linePtr->segPtr; ; segPtr = segPtr->nextPtr) { if (segPtr == NULL) { /* * Use the index of the last character in the line. Since the last * character on the line is guaranteed to be a '\n', we can back * up a constant sizeof(char) bytes. */ indexPtr->byteIndex = index - sizeof(char); break; } if (segPtr->typePtr == &tkTextCharType) { /* * Turn character offset into a byte offset. */ start = segPtr->body.chars; end = start + segPtr->size; for (p = start; p < end; p += offset) { if (charIndex == 0) { indexPtr->byteIndex = index; return indexPtr; } charIndex--; offset = Tcl_UtfToUniChar(p, &ch); index += offset; } } else { if (charIndex < segPtr->size) { indexPtr->byteIndex = index; break; } charIndex -= segPtr->size; index += segPtr->size; } } return indexPtr; } /* *--------------------------------------------------------------------------- * * TkTextIndexToSeg -- * * Given an index, this function returns the segment and offset within * segment for the index. * * Results: * The return value is a pointer to the segment referred to by indexPtr; * this will always be a segment with non-zero size. The variable at * *offsetPtr is set to hold the integer offset within the segment of the * character given by indexPtr. * * Side effects: * None. * *--------------------------------------------------------------------------- */ TkTextSegment * TkTextIndexToSeg( CONST TkTextIndex *indexPtr,/* Text index. */ int *offsetPtr) /* Where to store offset within segment, or * NULL if offset isn't wanted. */ { TkTextSegment *segPtr; int offset; for (offset = indexPtr->byteIndex, segPtr = indexPtr->linePtr->segPtr; offset >= segPtr->size; offset -= segPtr->size, segPtr = segPtr->nextPtr) { /* Empty loop body. */ } if (offsetPtr != NULL) { *offsetPtr = offset; } return segPtr; } /* *--------------------------------------------------------------------------- * * TkTextSegToOffset -- * * Given a segment pointer and the line containing it, this function * returns the offset of the segment within its line. * * Results: * The return value is the offset (within its line) of the first * character in segPtr. * * Side effects: * None. * *--------------------------------------------------------------------------- */ int TkTextSegToOffset( CONST TkTextSegment *segPtr,/* Segment whose offset is desired. */ CONST TkTextLine *linePtr) /* Line containing segPtr. */ { CONST TkTextSegment *segPtr2; int offset = 0; for (segPtr2 = linePtr->segPtr; segPtr2 != segPtr; segPtr2 = segPtr2->nextPtr) { offset += segPtr2->size; } return offset; } /* *--------------------------------------------------------------------------- * * TkTextGetObjIndex -- * * Simpler wrapper around the string based function, but could be * enhanced with a new object type in the future. * * Results: * see TkTextGetIndex * * Side effects: * None. * *--------------------------------------------------------------------------- */ int TkTextGetObjIndex( Tcl_Interp *interp, /* Use this for error reporting. */ TkText *textPtr, /* Information about text widget. */ Tcl_Obj *idxObj, /* Object containing textual description of * position. */ TkTextIndex *indexPtr) /* Index structure to fill in. */ { return GetIndex(interp, NULL, textPtr, Tcl_GetString(idxObj), indexPtr, NULL); } /* *--------------------------------------------------------------------------- * * TkTextSharedGetObjIndex -- * * Simpler wrapper around the string based function, but could be * enhanced with a new object type in the future. * * Results: * see TkTextGetIndex * * Side effects: * None. * *--------------------------------------------------------------------------- */ int TkTextSharedGetObjIndex( Tcl_Interp *interp, /* Use this for error reporting. */ TkSharedText *sharedTextPtr,/* Information about text widget. */ Tcl_Obj *idxObj, /* Object containing textual description of * position. */ TkTextIndex *indexPtr) /* Index structure to fill in. */ { return GetIndex(interp, sharedTextPtr, NULL, Tcl_GetString(idxObj), indexPtr, NULL); } /* *--------------------------------------------------------------------------- * * TkTextGetIndex -- * * Given a string, return the index that is described. * * Results: * The return value is a standard Tcl return result. If TCL_OK is * returned, then everything went well and the index at *indexPtr is * filled in; otherwise TCL_ERROR is returned and an error message is * left in the interp's result. * * Side effects: * None. * *--------------------------------------------------------------------------- */ int TkTextGetIndex( Tcl_Interp *interp, /* Use this for error reporting. */ TkText *textPtr, /* Information about text widget. */ CONST char *string, /* Textual description of position. */ TkTextIndex *indexPtr) /* Index structure to fill in. */ { return GetIndex(interp, NULL, textPtr, string, indexPtr, NULL); } /* *--------------------------------------------------------------------------- * * GetIndex -- * * Given a string, return the index that is described. * * Results: * The return value is a standard Tcl return result. If TCL_OK is * returned, then everything went well and the index at *indexPtr is * filled in; otherwise TCL_ERROR is returned and an error message is * left in the interp's result. * * If *canCachePtr is non-NULL, and everything went well, the integer it * points to is set to 1 if the indexPtr is something which can be * cached, and zero otherwise. * * Side effects: * None. * *--------------------------------------------------------------------------- */ static int GetIndex( Tcl_Interp *interp, /* Use this for error reporting. */ TkSharedText *sharedPtr, TkText *textPtr, /* Information about text widget. */ CONST char *string, /* Textual description of position. */ TkTextIndex *indexPtr, /* Index structure to fill in. */ int *canCachePtr) /* Pointer to integer to store whether we can * cache the index (or NULL). */ { char *p, *end, *endOfBase; TkTextIndex first, last; int wantLast, result; char c; CONST char *cp; Tcl_DString copy; int canCache = 0; if (sharedPtr == NULL) { sharedPtr = textPtr->sharedTextPtr; } /* *--------------------------------------------------------------------- * Stage 1: check to see if the index consists of nothing but a mark * name, an embedded window or an embedded image. We do this check * now even though it's also done later, in order to allow mark names, * embedded window names or image names that include funny characters * such as spaces or "+1c". *--------------------------------------------------------------------- */ if (TkTextMarkNameToIndex(textPtr, string, indexPtr) == TCL_OK) { goto done; } if (TkTextWindowIndex(textPtr, string, indexPtr) != 0) { return TCL_OK; } if (TkTextImageIndex(textPtr, string, indexPtr) != 0) { return TCL_OK; } /* *------------------------------------------------ * Stage 2: start again by parsing the base index. *------------------------------------------------ */ indexPtr->tree = sharedPtr->tree; /* * First look for the form "tag.first" or "tag.last" where "tag" is the * name of a valid tag. Try to use up as much as possible of the string in * this check (strrchr instead of strchr below). Doing the check now, and * in this way, allows tag names to include funny characters like "@" or * "+1c". */ Tcl_DStringInit(©); p = strrchr(Tcl_DStringAppend(©, string, -1), '.'); if (p != NULL) { TkTextSearch search; TkTextTag *tagPtr; Tcl_HashEntry *hPtr = NULL; CONST char *tagName; if ((p[1] == 'f') && (strncmp(p+1, "first", 5) == 0)) { wantLast = 0; endOfBase = p+6; } else if ((p[1] == 'l') && (strncmp(p+1, "last", 4) == 0)) { wantLast = 1; endOfBase = p+5; } else { goto tryxy; } tagPtr = NULL; tagName = Tcl_DStringValue(©); if (((p - tagName) == 3) && !strncmp(tagName, "sel", 3)) { /* * Special case for sel tag which is not stored in the hash table. */ tagPtr = textPtr->selTagPtr; } else { *p = 0; hPtr = Tcl_FindHashEntry(&sharedPtr->tagTable, tagName); *p = '.'; if (hPtr != NULL) { tagPtr = (TkTextTag *) Tcl_GetHashValue(hPtr); } } if (tagPtr == NULL) { goto tryxy; } TkTextMakeByteIndex(sharedPtr->tree, textPtr, 0, 0, &first); TkTextMakeByteIndex(sharedPtr->tree, textPtr, TkBTreeNumLines(sharedPtr->tree, textPtr), 0, &last); TkBTreeStartSearch(&first, &last, tagPtr, &search); if (!TkBTreeCharTagged(&first, tagPtr) && !TkBTreeNextTag(&search)) { if (tagPtr == textPtr->selTagPtr) { tagName = "sel"; } else { tagName = Tcl_GetHashKey(&sharedPtr->tagTable, hPtr); } Tcl_ResetResult(interp); Tcl_AppendResult(interp, "text doesn't contain any characters tagged with \"", tagName, "\"", NULL); Tcl_DStringFree(©); return TCL_ERROR; } *indexPtr = search.curIndex; if (wantLast) { while (TkBTreeNextTag(&search)) { *indexPtr = search.curIndex; } } goto gotBase; } tryxy: if (string[0] == '@') { /* * Find character at a given x,y location in the window. */ int x, y; cp = string+1; x = strtol(cp, &end, 0); if ((end == cp) || (*end != ',')) { goto error; } cp = end+1; y = strtol(cp, &end, 0); if (end == cp) { goto error; } TkTextPixelIndex(textPtr, x, y, indexPtr, NULL); endOfBase = end; goto gotBase; } if (isdigit(UCHAR(string[0])) || (string[0] == '-')) { int lineIndex, charIndex; /* * Base is identified with line and character indices. */ lineIndex = strtol(string, &end, 0) - 1; if ((end == string) || (*end != '.')) { goto error; } p = end+1; if ((*p == 'e') && (strncmp(p, "end", 3) == 0)) { charIndex = LAST_CHAR; endOfBase = p+3; } else { charIndex = strtol(p, &end, 0); if (end == p) { goto error; } endOfBase = end; } TkTextMakeCharIndex(sharedPtr->tree, textPtr, lineIndex, charIndex, indexPtr); canCache = 1; goto gotBase; } for (p = Tcl_DStringValue(©); *p != 0; p++) { if (isspace(UCHAR(*p)) || (*p == '+') || (*p == '-')) { break; } } endOfBase = p; if (string[0] == '.') { /* * See if the base position is the name of an embedded window. */ c = *endOfBase; *endOfBase = 0; result = TkTextWindowIndex(textPtr, Tcl_DStringValue(©), indexPtr); *endOfBase = c; if (result != 0) { goto gotBase; } } if ((string[0] == 'e') && (strncmp(string, "end", (size_t) (endOfBase-Tcl_DStringValue(©))) == 0)) { /* * Base position is end of text. */ TkTextMakeByteIndex(sharedPtr->tree, textPtr, TkBTreeNumLines(sharedPtr->tree, textPtr), 0, indexPtr); canCache = 1; goto gotBase; } else { /* * See if the base position is the name of a mark. */ c = *endOfBase; *endOfBase = 0; result = TkTextMarkNameToIndex(textPtr, Tcl_DStringValue(©), indexPtr); *endOfBase = c; if (result == TCL_OK) { goto gotBase; } /* * See if the base position is the name of an embedded image. */ c = *endOfBase; *endOfBase = 0; result = TkTextImageIndex(textPtr, Tcl_DStringValue(©), indexPtr); *endOfBase = c; if (result != 0) { goto gotBase; } } goto error; /* *------------------------------------------------------------------- * Stage 3: process zero or more modifiers. Each modifier is either a * keyword like "wordend" or "linestart", or it has the form "op count * units" where op is + or -, count is a number, and units is "chars" or * "lines". *------------------------------------------------------------------- */ gotBase: cp = endOfBase; while (1) { while (isspace(UCHAR(*cp))) { cp++; } if (*cp == 0) { break; } if ((*cp == '+') || (*cp == '-')) { cp = ForwBack(textPtr, cp, indexPtr); } else { cp = StartEnd(textPtr, cp, indexPtr); } if (cp == NULL) { goto error; } } Tcl_DStringFree(©); done: if (canCachePtr != NULL) { *canCachePtr = canCache; } if (indexPtr->linePtr == NULL) { Tcl_Panic("Bad index created"); } return TCL_OK; error: Tcl_DStringFree(©); Tcl_ResetResult(interp); Tcl_AppendResult(interp, "bad text index \"", string, "\"", NULL); return TCL_ERROR; } /* *--------------------------------------------------------------------------- * * TkTextPrintIndex -- * * This function generates a string description of an index, suitable for * reading in again later. * * Results: * The characters pointed to by string are modified. Returns the number * of characters in the string. * * Side effects: * None. * *--------------------------------------------------------------------------- */ int TkTextPrintIndex( CONST TkText *textPtr, CONST TkTextIndex *indexPtr,/* Pointer to index. */ char *string) /* Place to store the position. Must have at * least TK_POS_CHARS characters. */ { TkTextSegment *segPtr; TkTextLine *linePtr; int numBytes, charIndex; numBytes = indexPtr->byteIndex; charIndex = 0; linePtr = indexPtr->linePtr; for (segPtr = linePtr->segPtr; ; segPtr = segPtr->nextPtr) { if (segPtr == NULL) { /* * Two logical lines merged into one display line through eliding * of a newline. */ linePtr = TkBTreeNextLine(NULL, linePtr); segPtr = linePtr->segPtr; } if (numBytes <= segPtr->size) { break; } if (segPtr->typePtr == &tkTextCharType) { charIndex += Tcl_NumUtfChars(segPtr->body.chars, segPtr->size); } else { charIndex += segPtr->size; } numBytes -= segPtr->size; } if (segPtr->typePtr == &tkTextCharType) { charIndex += Tcl_NumUtfChars(segPtr->body.chars, numBytes); } else { charIndex += numBytes; } return sprintf(string, "%d.%d", TkBTreeLinesTo(textPtr, indexPtr->linePtr) + 1, charIndex); } /* *--------------------------------------------------------------------------- * * TkTextIndexCmp -- * * Compare two indices to see which one is earlier in the text. * * Results: * The return value is 0 if index1Ptr and index2Ptr refer to the same * position in the file, -1 if index1Ptr refers to an earlier position * than index2Ptr, and 1 otherwise. * * Side effects: * None. * *--------------------------------------------------------------------------- */ int TkTextIndexCmp( CONST TkTextIndex*index1Ptr,/* First index. */ CONST TkTextIndex*index2Ptr)/* Second index. */ { int line1, line2; if (index1Ptr->linePtr == index2Ptr->linePtr) { if (index1Ptr->byteIndex < index2Ptr->byteIndex) { return -1; } else if (index1Ptr->byteIndex > index2Ptr->byteIndex) { return 1; } else { return 0; } } /* * Assumption here that it is ok for comparisons to reflect the full * B-tree and not just the portion that is available to any client. This * should be true because the only indexPtr's we should be given are ones * which are valid for the current client. */ line1 = TkBTreeLinesTo(NULL, index1Ptr->linePtr); line2 = TkBTreeLinesTo(NULL, index2Ptr->linePtr); if (line1 < line2) { return -1; } if (line1 > line2) { return 1; } return 0; } /* *--------------------------------------------------------------------------- * * ForwBack -- * * This function handles +/- modifiers for indices to adjust the index * forwards or backwards. * * Results: * If the modifier in string is successfully parsed then the return value * is the address of the first character after the modifier, and * *indexPtr is updated to reflect the modifier. If there is a syntax * error in the modifier then NULL is returned. * * Side effects: * None. * *--------------------------------------------------------------------------- */ static CONST char * ForwBack( TkText *textPtr, /* Information about text widget. */ CONST char *string, /* String to parse for additional info about * modifier (count and units). Points to "+" * or "-" that starts modifier. */ TkTextIndex *indexPtr) /* Index to update as specified in string. */ { register CONST char *p, *units; char *end; int count, lineIndex, modifier; size_t length; /* * Get the count (how many units forward or backward). */ p = string+1; while (isspace(UCHAR(*p))) { p++; } count = strtol(p, &end, 0); if (end == p) { return NULL; } p = end; while (isspace(UCHAR(*p))) { p++; } /* * Find the end of this modifier (next space or + or - character), then * check if there is a textual 'display' or 'any' modifier. These * modifiers can be their own word (in which case they can be abbreviated) * or they can follow on to the actual unit in a single word (in which * case no abbreviation is allowed). So, 'display lines', 'd lines', * 'displaylin' are all ok, but 'dline' is not. */ units = p; while ((*p != '\0') && !isspace(UCHAR(*p)) && (*p != '+') && (*p != '-')) { p++; } length = p - units; if ((*units == 'd') && (strncmp(units, "display", (length > 7 ? 7 : length)) == 0)) { modifier = TKINDEX_DISPLAY; if (length > 7) { p -= (length - 7); } } else if ((*units == 'a') && (strncmp(units, "any", (length > 3 ? 3 : length)) == 0)) { modifier = TKINDEX_ANY; if (length > 3) { p -= (length - 3); } } else { modifier = TKINDEX_NONE; } /* * If we had a modifier, which we interpreted ok, so now forward to the * actual units. */ if (modifier != TKINDEX_NONE) { while (isspace(UCHAR(*p))) { p++; } units = p; while (*p!='\0' && !isspace(UCHAR(*p)) && *p!='+' && *p!='-') { p++; } length = p - units; } /* * Finally parse the units. */ if ((*units == 'c') && (strncmp(units, "chars", length) == 0)) { TkTextCountType type; if (modifier == TKINDEX_NONE) { type = COUNT_INDICES; } else if (modifier == TKINDEX_ANY) { type = COUNT_CHARS; } else { type = COUNT_DISPLAY_CHARS; } if (*string == '+') { TkTextIndexForwChars(textPtr, indexPtr, count, indexPtr, type); } else { TkTextIndexBackChars(textPtr, indexPtr, count, indexPtr, type); } } else if ((*units == 'i') && (strncmp(units, "indices", length) == 0)) { TkTextCountType type; if (modifier == TKINDEX_DISPLAY) { type = COUNT_DISPLAY_INDICES; } else { type = COUNT_INDICES; } if (*string == '+') { TkTextIndexForwChars(textPtr, indexPtr, count, indexPtr, type); } else { TkTextIndexBackChars(textPtr, indexPtr, count, indexPtr, type); } } else if ((*units == 'l') && (strncmp(units, "lines", length) == 0)) { if (modifier == TKINDEX_DISPLAY) { /* * Find the appropriate pixel offset of the current position * within its display line. This also has the side-effect of * moving indexPtr, but that doesn't matter since we will do it * again below. * * Then find the right display line, and finally calculated the * index we want in that display line, based on the original pixel * offset. */ int xOffset, forward; if (TkTextIsElided(textPtr, indexPtr, NULL)) { /* * Go forward to the first non-elided index. */ TkTextIndexForwChars(textPtr, indexPtr, 0, indexPtr, COUNT_DISPLAY_INDICES); } /* * Unlike the Forw/BackChars code, the display line code is * sensitive to whether we are genuinely going forwards or * backwards. So, we need to determine that. This is important in * the case where we have "+ -3 displaylines", for example. */ if ((count < 0) ^ (*string == '-')) { forward = 0; } else { forward = 1; } count = abs(count); if (count == 0) { return p; } if (forward) { TkTextFindDisplayLineEnd(textPtr, indexPtr, 1, &xOffset); while (count-- > 0) { /* * Go to the end of the line, then forward one char/byte * to get to the beginning of the next line. */ TkTextFindDisplayLineEnd(textPtr, indexPtr, 1, NULL); TkTextIndexForwChars(textPtr, indexPtr, 1, indexPtr, COUNT_DISPLAY_INDICES); } } else { TkTextFindDisplayLineEnd(textPtr, indexPtr, 0, &xOffset); while (count-- > 0) { /* * Go to the beginning of the line, then backward one * char/byte to get to the end of the previous line. */ TkTextFindDisplayLineEnd(textPtr, indexPtr, 0, NULL); TkTextIndexBackChars(textPtr, indexPtr, 1, indexPtr, COUNT_DISPLAY_INDICES); } TkTextFindDisplayLineEnd(textPtr, indexPtr, 0, NULL); } /* * This call assumes indexPtr is the beginning of a display line * and moves it to the 'xOffset' position of that line, which is * just what we want. */ TkTextIndexOfX(textPtr, xOffset, indexPtr); } else { lineIndex = TkBTreeLinesTo(textPtr, indexPtr->linePtr); if (*string == '+') { lineIndex += count; } else { lineIndex -= count; /* * The check below retains the character position, even if the * line runs off the start of the file. Without it, the * character position will get reset to 0 by TkTextMakeIndex. */ if (lineIndex < 0) { lineIndex = 0; } } /* * This doesn't work quite right if using a proportional font or * UTF-8 characters with varying numbers of bytes, or if there are * embedded windows, images, etc. The cursor will bop around, * keeping a constant number of bytes (not characters) from the * left edge (but making sure not to split any UTF-8 characters), * regardless of the x-position the index corresponds to. The * proper way to do this is to get the x-position of the index and * then pick the character at the same x-position in the new line. */ TkTextMakeByteIndex(indexPtr->tree, textPtr, lineIndex, indexPtr->byteIndex, indexPtr); } } else { return NULL; } return p; } /* *--------------------------------------------------------------------------- * * TkTextIndexForwBytes -- * * Given an index for a text widget, this function creates a new index * that points "count" bytes ahead of the source index. * * Results: * *dstPtr is modified to refer to the character "count" bytes after * srcPtr, or to the last character in the TkText if there aren't "count" * bytes left. * * In this latter case, the function returns '1' to indicate that not all * of 'byteCount' could be used. * * Side effects: * None. * *--------------------------------------------------------------------------- */ int TkTextIndexForwBytes( CONST TkText *textPtr, CONST TkTextIndex *srcPtr, /* Source index. */ int byteCount, /* How many bytes forward to move. May be * negative. */ TkTextIndex *dstPtr) /* Destination index: gets modified. */ { TkTextLine *linePtr; TkTextSegment *segPtr; int lineLength; if (byteCount < 0) { TkTextIndexBackBytes(textPtr, srcPtr, -byteCount, dstPtr); return 0; } *dstPtr = *srcPtr; dstPtr->byteIndex += byteCount; while (1) { /* * Compute the length of the current line. */ lineLength = 0; for (segPtr = dstPtr->linePtr->segPtr; segPtr != NULL; segPtr = segPtr->nextPtr) { lineLength += segPtr->size; } /* * If the new index is in the same line then we're done. Otherwise go * on to the next line. */ if (dstPtr->byteIndex < lineLength) { return 0; } dstPtr->byteIndex -= lineLength; linePtr = TkBTreeNextLine(textPtr, dstPtr->linePtr); if (linePtr == NULL) { dstPtr->byteIndex = lineLength - 1; return 1; } dstPtr->linePtr = linePtr; } } /* *--------------------------------------------------------------------------- * * TkTextIndexForwChars -- * * Given an index for a text widget, this function creates a new index * that points "count" items of type given by "type" ahead of the source * index. "count" can be zero, which is useful in the case where one * wishes to move forward by display (non-elided) chars or indices or one * wishes to move forward by chars, skipping any intervening indices. In * this case dstPtr will point to the first acceptable index which is * encountered. * * Results: * *dstPtr is modified to refer to the character "count" items after * srcPtr, or to the last character in the TkText if there aren't * sufficient items left in the widget. * * Side effects: * None. * *--------------------------------------------------------------------------- */ void TkTextIndexForwChars( CONST TkText *textPtr, /* Overall information about text widget. */ CONST TkTextIndex *srcPtr, /* Source index. */ int charCount, /* How many characters forward to move. May * be negative. */ TkTextIndex *dstPtr, /* Destination index: gets modified. */ TkTextCountType type) /* The type of item to count */ { TkTextLine *linePtr; TkTextSegment *segPtr; TkTextElideInfo *infoPtr = NULL; int byteOffset; char *start, *end, *p; Tcl_UniChar ch; int elide = 0; int checkElided = (type & COUNT_DISPLAY); if (charCount < 0) { TkTextIndexBackChars(textPtr, srcPtr, -charCount, dstPtr, type); return; } if (checkElided) { infoPtr = (TkTextElideInfo *) ckalloc((unsigned) sizeof(TkTextElideInfo)); elide = TkTextIsElided(textPtr, srcPtr, infoPtr); } *dstPtr = *srcPtr; /* * Find seg that contains src byteIndex. Move forward specified number of * chars. */ if (checkElided) { /* * In this case we have already calculated the information we need, so * no need to use TkTextIndexToSeg() */ segPtr = infoPtr->segPtr; byteOffset = dstPtr->byteIndex - infoPtr->segOffset; } else { segPtr = TkTextIndexToSeg(dstPtr, &byteOffset); } while (1) { /* * Go through each segment in line looking for specified character * index. */ for ( ; segPtr != NULL; segPtr = segPtr->nextPtr) { /* * If we do need to pay attention to the visibility of * characters/indices, check that first. If the current segment * isn't visible, then we simply continue the loop. */ if (checkElided && ((segPtr->typePtr == &tkTextToggleOffType) || (segPtr->typePtr == &tkTextToggleOnType))) { TkTextTag *tagPtr = segPtr->body.toggle.tagPtr; /* * The elide state only changes if this tag is either the * current highest priority tag (and is therefore being * toggled off), or it's a new tag with higher priority. */ if (tagPtr->elideString != NULL) { infoPtr->tagCnts[tagPtr->priority]++; if (infoPtr->tagCnts[tagPtr->priority] & 1) { infoPtr->tagPtrs[tagPtr->priority] = tagPtr; } if (tagPtr->priority >= infoPtr->elidePriority) { if (segPtr->typePtr == &tkTextToggleOffType) { /* * If it is being toggled off, and it has an elide * string, it must actually be the current highest * priority tag, so this check is redundant: */ if (tagPtr->priority != infoPtr->elidePriority) { Tcl_Panic("Bad tag priority being toggled off"); } /* * Find previous elide tag, if any (if not then * elide will be zero, of course). */ elide = 0; while (--infoPtr->elidePriority > 0) { if (infoPtr->tagCnts[infoPtr->elidePriority] & 1) { elide = infoPtr->tagPtrs [infoPtr->elidePriority]->elide; break; } } } else { elide = tagPtr->elide; infoPtr->elidePriority = tagPtr->priority; } } } } if (!elide) { if (segPtr->typePtr == &tkTextCharType) { start = segPtr->body.chars + byteOffset; end = segPtr->body.chars + segPtr->size; for (p = start; p < end; p += Tcl_UtfToUniChar(p, &ch)) { if (charCount == 0) { dstPtr->byteIndex += (p - start); goto forwardCharDone; } charCount--; } } else if (type & COUNT_INDICES) { if (charCount < segPtr->size - byteOffset) { dstPtr->byteIndex += charCount; goto forwardCharDone; } charCount -= segPtr->size - byteOffset; } } dstPtr->byteIndex += segPtr->size - byteOffset; byteOffset = 0; } /* * Go to the next line. If we are at the end of the text item, back up * one byte (for the terminal '\n' character) and return that index. */ linePtr = TkBTreeNextLine(textPtr, dstPtr->linePtr); if (linePtr == NULL) { dstPtr->byteIndex -= sizeof(char); goto forwardCharDone; } dstPtr->linePtr = linePtr; dstPtr->byteIndex = 0; segPtr = dstPtr->linePtr->segPtr; } forwardCharDone: if (infoPtr != NULL) { TkTextFreeElideInfo(infoPtr); ckfree((char *) infoPtr); } } /* *--------------------------------------------------------------------------- * * TkTextIndexCountBytes -- * * Given a pair of indices in a text widget, this function counts how * many bytes are between the two indices. The two indices do not need * to be ordered. * * Results: * The number of bytes in the given range. * * Side effects: * None. * *--------------------------------------------------------------------------- */ int TkTextIndexCountBytes( CONST TkText *textPtr, CONST TkTextIndex *indexPtr1, /* Index describing one location. */ CONST TkTextIndex *indexPtr2) /* Index describing second location. */ { int compare = TkTextIndexCmp(indexPtr1, indexPtr2); if (compare == 0) { return 0; } else if (compare > 0) { return IndexCountBytesOrdered(textPtr, indexPtr2, indexPtr1); } else { return IndexCountBytesOrdered(textPtr, indexPtr1, indexPtr2); } } static int IndexCountBytesOrdered( CONST TkText *textPtr, CONST TkTextIndex *indexPtr1, /* Index describing location of character from * which to count. */ CONST TkTextIndex *indexPtr2) /* Index describing location of last character * at which to stop the count. */ { int byteCount, offset; TkTextSegment *segPtr, *segPtr1; TkTextLine *linePtr; if (indexPtr1->linePtr == indexPtr2->linePtr) { return indexPtr2->byteIndex - indexPtr1->byteIndex; } /* * indexPtr2 is on a line strictly after the line containing indexPtr1. * Add up: * bytes between indexPtr1 and end of its line * bytes in lines strictly between indexPtr1 and indexPtr2 * bytes between start of the indexPtr2 line and indexPtr2 */ segPtr1 = TkTextIndexToSeg(indexPtr1, &offset); byteCount = -offset; for (segPtr = segPtr1; segPtr != NULL; segPtr = segPtr->nextPtr) { byteCount += segPtr->size; } linePtr = indexPtr1->linePtr->nextPtr; while (linePtr != indexPtr2->linePtr) { for (segPtr = linePtr->segPtr; segPtr != NULL; segPtr = segPtr->nextPtr) { byteCount += segPtr->size; } linePtr = TkBTreeNextLine(textPtr, linePtr); if (linePtr == NULL) { Tcl_Panic("TextIndexCountBytesOrdered ran out of lines"); } } byteCount += indexPtr2->byteIndex; return byteCount; } /* *--------------------------------------------------------------------------- * * TkTextIndexCount -- * * Given an ordered pair of indices in a text widget, this function * counts how many characters (not bytes) are between the two indices. * * It is illegal to call this function with unordered indices. * * Note that 'textPtr' is only used if we need to check for elided * attributes, i.e. if type is COUNT_DISPLAY_INDICES or * COUNT_DISPLAY_CHARS. * * Results: * The number of characters in the given range, which meet the * appropriate 'type' attributes. * * Side effects: * None. * *--------------------------------------------------------------------------- */ int TkTextIndexCount( CONST TkText *textPtr, /* Overall information about text widget. */ CONST TkTextIndex *indexPtr1, /* Index describing location of character from * which to count. */ CONST TkTextIndex *indexPtr2, /* Index describing location of last character * at which to stop the count. */ TkTextCountType type) /* The kind of indices to count. */ { TkTextLine *linePtr1; TkTextSegment *segPtr, *seg2Ptr = NULL; TkTextElideInfo *infoPtr = NULL; int byteOffset, maxBytes, count = 0, elide = 0; int checkElided = (type & COUNT_DISPLAY); /* * Find seg that contains src index, and remember how many bytes not to * count in the given segment. */ segPtr = TkTextIndexToSeg(indexPtr1, &byteOffset); linePtr1 = indexPtr1->linePtr; seg2Ptr = TkTextIndexToSeg(indexPtr2, &maxBytes); if (checkElided) { infoPtr = (TkTextElideInfo *) ckalloc((unsigned) sizeof(TkTextElideInfo)); elide = TkTextIsElided(textPtr, indexPtr1, infoPtr); } while (1) { /* * Go through each segment in line adding up the number of characters. */ for ( ; segPtr != NULL; segPtr = segPtr->nextPtr) { /* * If we do need to pay attention to the visibility of * characters/indices, check that first. If the current segment * isn't visible, then we simply continue the loop. */ if (checkElided) { if ((segPtr->typePtr == &tkTextToggleOffType) || (segPtr->typePtr == &tkTextToggleOnType)) { TkTextTag *tagPtr = segPtr->body.toggle.tagPtr; /* * The elide state only changes if this tag is either the * current highest priority tag (and is therefore being * toggled off), or it's a new tag with higher priority. */ if (tagPtr->elideString != NULL) { infoPtr->tagCnts[tagPtr->priority]++; if (infoPtr->tagCnts[tagPtr->priority] & 1) { infoPtr->tagPtrs[tagPtr->priority] = tagPtr; } if (tagPtr->priority >= infoPtr->elidePriority) { if (segPtr->typePtr == &tkTextToggleOffType) { /* * If it is being toggled off, and it has an * elide string, it must actually be the * current highest priority tag, so this check * is redundant: */ if (tagPtr->priority!=infoPtr->elidePriority) { Tcl_Panic("Bad tag priority being toggled off"); } /* * Find previous elide tag, if any (if not * then elide will be zero, of course). */ elide = 0; while (--infoPtr->elidePriority > 0) { if (infoPtr->tagCnts[ infoPtr->elidePriority] & 1) { elide = infoPtr->tagPtrs[ infoPtr->elidePriority]->elide; break; } } } else { elide = tagPtr->elide; infoPtr->elidePriority = tagPtr->priority; } } } } if (elide) { if (segPtr == seg2Ptr) { goto countDone; } byteOffset = 0; continue; } } if (segPtr->typePtr == &tkTextCharType) { int byteLen = segPtr->size - byteOffset; register unsigned char *str = (unsigned char *) segPtr->body.chars + byteOffset; register int i; if (segPtr == seg2Ptr) { if (byteLen > (maxBytes - byteOffset)) { byteLen = maxBytes - byteOffset; } } i = byteLen; /* * This is a speed sensitive function, so run specially over * the string to count continuous ascii characters before * resorting to the Tcl_NumUtfChars call. This is a long form * of: * * stringPtr->numChars = * Tcl_NumUtfChars(objPtr->bytes, objPtr->length); */ while (i && (*str < 0xC0)) { i--; str++; } count += byteLen - i; if (i) { count += Tcl_NumUtfChars(segPtr->body.chars + byteOffset + (byteLen - i), i); } } else { if (type & COUNT_INDICES) { int byteLen = segPtr->size - byteOffset; if (segPtr == seg2Ptr) { if (byteLen > (maxBytes - byteOffset)) { byteLen = maxBytes - byteOffset; } } count += byteLen; } } if (segPtr == seg2Ptr) { goto countDone; } byteOffset = 0; } /* * Go to the next line. If we are at the end of the text item, back up * one byte (for the terminal '\n' character) and return that index. */ linePtr1 = TkBTreeNextLine(textPtr, linePtr1); if (linePtr1 == NULL) { Tcl_Panic("Reached end of text widget when counting characters"); } segPtr = linePtr1->segPtr; } countDone: if (infoPtr != NULL) { TkTextFreeElideInfo(infoPtr); ckfree((char *) infoPtr); } return count; } /* *--------------------------------------------------------------------------- * * TkTextIndexBackBytes -- * * Given an index for a text widget, this function creates a new index * that points "count" bytes earlier than the source index. * * Results: * *dstPtr is modified to refer to the character "count" bytes before * srcPtr, or to the first character in the TkText if there aren't * "count" bytes earlier than srcPtr. * * Returns 1 if we couldn't use all of 'byteCount' because we have run * into the beginning or end of the text, and zero otherwise. * * Side effects: * None. * *--------------------------------------------------------------------------- */ int TkTextIndexBackBytes( CONST TkText *textPtr, CONST TkTextIndex *srcPtr, /* Source index. */ int byteCount, /* How many bytes backward to move. May be * negative. */ TkTextIndex *dstPtr) /* Destination index: gets modified. */ { TkTextSegment *segPtr; int lineIndex; if (byteCount < 0) { return TkTextIndexForwBytes(textPtr, srcPtr, -byteCount, dstPtr); } *dstPtr = *srcPtr; dstPtr->byteIndex -= byteCount; lineIndex = -1; while (dstPtr->byteIndex < 0) { /* * Move back one line in the text. If we run off the beginning of the * file then just return the first character in the text. */ if (lineIndex < 0) { lineIndex = TkBTreeLinesTo(textPtr, dstPtr->linePtr); } if (lineIndex == 0) { dstPtr->byteIndex = 0; return 1; } lineIndex--; dstPtr->linePtr = TkBTreeFindLine(dstPtr->tree, textPtr, lineIndex); /* * Compute the length of the line and add that to dstPtr->charIndex. */ for (segPtr = dstPtr->linePtr->segPtr; segPtr != NULL; segPtr = segPtr->nextPtr) { dstPtr->byteIndex += segPtr->size; } } return 0; } /* *--------------------------------------------------------------------------- * * TkTextIndexBackChars -- * * Given an index for a text widget, this function creates a new index * that points "count" items of type given by "type" earlier than the * source index. "count" can be zero, which is useful in the case where * one wishes to move backward by display (non-elided) chars or indices * or one wishes to move backward by chars, skipping any intervening * indices. In this case the returned index *dstPtr will point just * _after_ the first acceptable index which is encountered. * * Results: * *dstPtr is modified to refer to the character "count" items before * srcPtr, or to the first index in the window if there aren't sufficient * items earlier than srcPtr. * * Side effects: * None. * *--------------------------------------------------------------------------- */ void TkTextIndexBackChars( CONST TkText *textPtr, /* Overall information about text widget. */ CONST TkTextIndex *srcPtr, /* Source index. */ int charCount, /* How many characters backward to move. May * be negative. */ TkTextIndex *dstPtr, /* Destination index: gets modified. */ TkTextCountType type) /* The type of item to count */ { TkTextSegment *segPtr, *oldPtr; TkTextElideInfo *infoPtr = NULL; int lineIndex, segSize; CONST char *p, *start, *end; int elide = 0; int checkElided = (type & COUNT_DISPLAY); if (charCount < 0) { TkTextIndexForwChars(textPtr, srcPtr, -charCount, dstPtr, type); return; } if (checkElided) { infoPtr = (TkTextElideInfo *) ckalloc(sizeof(TkTextElideInfo)); elide = TkTextIsElided(textPtr, srcPtr, infoPtr); } *dstPtr = *srcPtr; /* * Find offset within seg that contains byteIndex. Move backward specified * number of chars. */ lineIndex = -1; segSize = dstPtr->byteIndex; if (checkElided) { segPtr = infoPtr->segPtr; segSize -= infoPtr->segOffset; } else { TkTextLine *linePtr = dstPtr->linePtr; for (segPtr = linePtr->segPtr; ; segPtr = segPtr->nextPtr) { if (segPtr == NULL) { /* * Two logical lines merged into one display line through * eliding of a newline. */ linePtr = TkBTreeNextLine(NULL, linePtr); segPtr = linePtr->segPtr; } if (segSize <= segPtr->size) { break; } segSize -= segPtr->size; } } /* * Now segPtr points to the segment containing the starting index. */ while (1) { /* * If we do need to pay attention to the visibility of * characters/indices, check that first. If the current segment isn't * visible, then we simply continue the loop. */ if (checkElided && ((segPtr->typePtr == &tkTextToggleOffType) || (segPtr->typePtr == &tkTextToggleOnType))) { TkTextTag *tagPtr = segPtr->body.toggle.tagPtr; /* * The elide state only changes if this tag is either the current * highest priority tag (and is therefore being toggled off), or * it's a new tag with higher priority. */ if (tagPtr->elideString != NULL) { infoPtr->tagCnts[tagPtr->priority]++; if (infoPtr->tagCnts[tagPtr->priority] & 1) { infoPtr->tagPtrs[tagPtr->priority] = tagPtr; } if (tagPtr->priority >= infoPtr->elidePriority) { if (segPtr->typePtr == &tkTextToggleOnType) { /* * If it is being toggled on, and it has an elide * string, it must actually be the current highest * priority tag, so this check is redundant: */ if (tagPtr->priority != infoPtr->elidePriority) { Tcl_Panic("Bad tag priority being toggled on"); } /* * Find previous elide tag, if any (if not then elide * will be zero, of course). */ elide = 0; while (--infoPtr->elidePriority > 0) { if (infoPtr->tagCnts[infoPtr->elidePriority] & 1) { elide = infoPtr->tagPtrs[ infoPtr->elidePriority]->elide; break; } } } else { elide = tagPtr->elide; infoPtr->elidePriority = tagPtr->priority; } } } } if (!elide) { if (segPtr->typePtr == &tkTextCharType) { start = segPtr->body.chars; end = segPtr->body.chars + segSize; for (p = end; ; p = Tcl_UtfPrev(p, start)) { if (charCount == 0) { dstPtr->byteIndex -= (end - p); goto backwardCharDone; } if (p == start) { break; } charCount--; } } else { if (type & COUNT_INDICES) { if (charCount <= segSize) { dstPtr->byteIndex -= charCount; goto backwardCharDone; } charCount -= segSize; } } } dstPtr->byteIndex -= segSize; /* * Move back into previous segment. */ oldPtr = segPtr; segPtr = dstPtr->linePtr->segPtr; if (segPtr != oldPtr) { for ( ; segPtr->nextPtr != oldPtr; segPtr = segPtr->nextPtr) { /* Empty body. */ } segSize = segPtr->size; continue; } /* * Move back to previous line. */ if (lineIndex < 0) { lineIndex = TkBTreeLinesTo(textPtr, dstPtr->linePtr); } if (lineIndex == 0) { dstPtr->byteIndex = 0; goto backwardCharDone; } lineIndex--; dstPtr->linePtr = TkBTreeFindLine(dstPtr->tree, textPtr, lineIndex); /* * Compute the length of the line and add that to dstPtr->byteIndex. */ oldPtr = dstPtr->linePtr->segPtr; for (segPtr = oldPtr; segPtr != NULL; segPtr = segPtr->nextPtr) { dstPtr->byteIndex += segPtr->size; oldPtr = segPtr; } segPtr = oldPtr; segSize = segPtr->size; } backwardCharDone: if (infoPtr != NULL) { TkTextFreeElideInfo(infoPtr); ckfree((char *) infoPtr); } } /* *---------------------------------------------------------------------- * * StartEnd -- * * This function handles modifiers like "wordstart" and "lineend" to * adjust indices forwards or backwards. * * Results: * If the modifier is successfully parsed then the return value is the * address of the first character after the modifier, and *indexPtr is * updated to reflect the modifier. If there is a syntax error in the * modifier then NULL is returned. * * Side effects: * None. * *---------------------------------------------------------------------- */ static CONST char * StartEnd( TkText *textPtr, /* Information about text widget. */ CONST char *string, /* String to parse for additional info about * modifier (count and units). Points to first * character of modifer word. */ TkTextIndex *indexPtr) /* Index to modify based on string. */ { CONST char *p; size_t length; register TkTextSegment *segPtr; int modifier; /* * Find the end of the modifier word. */ for (p = string; isalnum(UCHAR(*p)); p++) { /* Empty loop body. */ } length = p-string; if ((*string == 'd') && (strncmp(string, "display", (length > 7 ? 7 : length)) == 0)) { modifier = TKINDEX_DISPLAY; if (length > 7) { p -= (length - 7); } } else if ((*string == 'a') && (strncmp(string, "any", (length > 3 ? 3 : length)) == 0)) { modifier = TKINDEX_ANY; if (length > 3) { p -= (length - 3); } } else { modifier = TKINDEX_NONE; } /* * If we had a modifier, which we interpreted ok, so now forward to the * actual units. */ if (modifier != TKINDEX_NONE) { while (isspace(UCHAR(*p))) { p++; } string = p; while ((*p!='\0') && !isspace(UCHAR(*p)) && (*p!='+') && (*p!='-')) { p++; } length = p - string; } if ((*string == 'l') && (strncmp(string, "lineend", length) == 0) && (length >= 5)) { if (modifier == TKINDEX_DISPLAY) { TkTextFindDisplayLineEnd(textPtr, indexPtr, 1, NULL); } else { indexPtr->byteIndex = 0; for (segPtr = indexPtr->linePtr->segPtr; segPtr != NULL; segPtr = segPtr->nextPtr) { indexPtr->byteIndex += segPtr->size; } /* * We know '\n' is encoded with a single byte index. */ indexPtr->byteIndex -= sizeof(char); } } else if ((*string == 'l') && (strncmp(string, "linestart", length) == 0) && (length >= 5)) { if (modifier == TKINDEX_DISPLAY) { TkTextFindDisplayLineEnd(textPtr, indexPtr, 0, NULL); } else { indexPtr->byteIndex = 0; } } else if ((*string == 'w') && (strncmp(string, "wordend", length) == 0) && (length >= 5)) { int firstChar = 1; int offset; /* * If the current character isn't part of a word then just move * forward one character. Otherwise move forward until finding a * character that isn't part of a word and stop there. */ if (modifier == TKINDEX_DISPLAY) { TkTextIndexForwChars(textPtr, indexPtr, 0, indexPtr, COUNT_DISPLAY_INDICES); } segPtr = TkTextIndexToSeg(indexPtr, &offset); while (1) { int chSize = 1; if (segPtr->typePtr == &tkTextCharType) { Tcl_UniChar ch; chSize = Tcl_UtfToUniChar(segPtr->body.chars + offset, &ch); if (!Tcl_UniCharIsWordChar(ch)) { break; } firstChar = 0; } offset += chSize; indexPtr->byteIndex += chSize; if (offset >= segPtr->size) { segPtr = TkTextIndexToSeg(indexPtr, &offset); } } if (firstChar) { if (modifier == TKINDEX_DISPLAY) { TkTextIndexForwChars(textPtr, indexPtr, 1, indexPtr, COUNT_DISPLAY_INDICES); } else { TkTextIndexForwChars(NULL, indexPtr, 1, indexPtr, COUNT_INDICES); } } } else if ((*string == 'w') && (strncmp(string, "wordstart", length) == 0) && (length >= 5)) { int firstChar = 1; int offset; if (modifier == TKINDEX_DISPLAY) { TkTextIndexForwChars(NULL, indexPtr, 0, indexPtr, COUNT_DISPLAY_INDICES); } /* * Starting with the current character, look for one that's not part * of a word and keep moving backward until you find one. Then if the * character found wasn't the first one, move forward again one * position. */ segPtr = TkTextIndexToSeg(indexPtr, &offset); while (1) { int chSize = 1; if (segPtr->typePtr == &tkTextCharType) { Tcl_UniChar ch; Tcl_UtfToUniChar(segPtr->body.chars + offset, &ch); if (!Tcl_UniCharIsWordChar(ch)) { break; } if (offset > 0) { chSize = (segPtr->body.chars + offset - Tcl_UtfPrev(segPtr->body.chars + offset, segPtr->body.chars)); } firstChar = 0; } offset -= chSize; indexPtr->byteIndex -= chSize; if (offset < 0) { if (indexPtr->byteIndex < 0) { indexPtr->byteIndex = 0; goto done; } segPtr = TkTextIndexToSeg(indexPtr, &offset); } } if (!firstChar) { if (modifier == TKINDEX_DISPLAY) { TkTextIndexForwChars(textPtr, indexPtr, 1, indexPtr, COUNT_DISPLAY_INDICES); } else { TkTextIndexForwChars(NULL, indexPtr, 1, indexPtr, COUNT_INDICES); } } } else { return NULL; } done: return p; } /* * Local Variables: * mode: c * c-basic-offset: 4 * fill-column: 78 * End: */