Memory-managed wrapper type.

Construct a TextIter struct initialized to zero.

A convenience alias for Nothing :: Maybe TextIter.

Assigns the value of other to iter. This function is not useful in applications, because iterators can be assigned with GtkTextIter i = j;. The function is used by language bindings.

Since: 3.2

Moves backward by one character offset. Returns True if movement was possible; if iter was the first in the buffer (character offset 0), textIterBackwardChar returns False for convenience when writing loops.

Moves count characters backward, if possible (if count would move past the start or end of the buffer, moves to the start or end of the buffer). The return value indicates whether the iterator moved onto a dereferenceable position; if the iterator didn’t move, or moved onto the end iterator, then False is returned. If count is 0, the function does nothing and returns False.

Like textIterForwardCursorPosition, but moves backward.

Moves up to count cursor positions. See textIterForwardCursorPosition for details.

Same as textIterForwardFindChar, but goes backward from iter.

Moves iter to the start of the previous line. Returns True if iter could be moved; i.e. if iter was at character offset 0, this function returns False. Therefore if iter was already on line 0, but not at the start of the line, iter is snapped to the start of the line and the function returns True. (Note that this implies that in a loop calling this function, the line number may not change on every iteration, if your first iteration is on line 0.)

Moves count lines backward, if possible (if count would move past the start or end of the buffer, moves to the start or end of the buffer). The return value indicates whether the iterator moved onto a dereferenceable position; if the iterator didn’t move, or moved onto the end iterator, then False is returned. If count is 0, the function does nothing and returns False. If count is negative, moves forward by 0 - count lines.

Same as textIterForwardSearch, but moves backward.

matchEnd will never be set to a TextIter located after iter, even if there is a possible matchStart before or at iter.

Moves backward to the previous sentence start; if iter is already at the start of a sentence, moves backward to the next one. Sentence boundaries are determined by Pango and should be correct for nearly any language (if not, the correct fix would be to the Pango text boundary algorithms).

Calls textIterBackwardSentenceStart up to count times, or until it returns False. If count is negative, moves forward instead of backward.

Moves backward to the next toggle (on or off) of the TextTag tag, or to the next toggle of any tag if tag is Nothing. If no matching tag toggles are found, returns False, otherwise True. Does not return toggles located at iter, only toggles before iter. Sets iter to the location of the toggle, or the start of the buffer if no toggle is found.

Moves iter forward to the previous visible cursor position. See textIterBackwardCursorPosition for details.

Since: 2.4

Moves up to count visible cursor positions. See textIterBackwardCursorPosition for details.

Since: 2.4

Moves iter to the start of the previous visible line. Returns True if iter could be moved; i.e. if iter was at character offset 0, this function returns False. Therefore if iter was already on line 0, but not at the start of the line, iter is snapped to the start of the line and the function returns True. (Note that this implies that in a loop calling this function, the line number may not change on every iteration, if your first iteration is on line 0.)

Since: 2.8

Moves count visible lines backward, if possible (if count would move past the start or end of the buffer, moves to the start or end of the buffer). The return value indicates whether the iterator moved onto a dereferenceable position; if the iterator didn’t move, or moved onto the end iterator, then False is returned. If count is 0, the function does nothing and returns False. If count is negative, moves forward by 0 - count lines.

Since: 2.8

Moves backward to the previous visible word start. (If iter is currently on a word start, moves backward to the next one after that.) Word breaks are determined by Pango and should be correct for nearly any language (if not, the correct fix would be to the Pango word break algorithms).

Since: 2.4

Calls textIterBackwardVisibleWordStart up to count times.

Since: 2.4

Moves backward to the previous word start. (If iter is currently on a word start, moves backward to the next one after that.) Word breaks are determined by Pango and should be correct for nearly any language (if not, the correct fix would be to the Pango word break algorithms).

Calls textIterBackwardWordStart up to count times.

Returns True if tag is toggled on at exactly this point. If tag is Nothing, returns True if any tag is toggled on at this point.

Note that if textIterBeginsTag returns True, it means that iter is at the beginning of the tagged range, and that the character at iter is inside the tagged range. In other words, unlike textIterEndsTag, if textIterBeginsTag returns True, textIterHasTag will also return True for the same parameters.

Considering the default editability of the buffer, and tags that affect editability, determines whether text inserted at iter would be editable. If text inserted at iter would be editable then the user should be allowed to insert text at iter. textBufferInsertInteractive uses this function to decide whether insertions are allowed at a given position.

A qsort()-style function that returns negative if lhs is less than rhs, positive if lhs is greater than rhs, and 0 if they’re equal. Ordering is in character offset order, i.e. the first character in the buffer is less than the second character in the buffer.

Creates a dynamically-allocated copy of an iterator. This function is not useful in applications, because iterators can be copied with a simple assignment (GtkTextIter i = j;). The function is used by language bindings.

Returns whether the character at iter is within an editable region of text. Non-editable text is “locked” and can’t be changed by the user via TextView. This function is simply a convenience wrapper around textIterGetAttributes. If no tags applied to this text affect editability, defaultSetting will be returned.

You don’t want to use this function to decide whether text can be inserted at iter, because for insertion you don’t want to know whether the char at iter is inside an editable range, you want to know whether a new character inserted at iter would be inside an editable range. Use textIterCanInsert to handle this case.

Returns True if iter points to the start of the paragraph delimiter characters for a line (delimiters will be either a newline, a carriage return, a carriage return followed by a newline, or a Unicode paragraph separator character). Note that an iterator pointing to the \n of a \r\n pair will not be counted as the end of a line, the line ends before the \r. The end iterator is considered to be at the end of a line, even though there are no paragraph delimiter chars there.

Determines whether iter ends a sentence. Sentence boundaries are determined by Pango and should be correct for nearly any language (if not, the correct fix would be to the Pango text boundary algorithms).

Returns True if tag is toggled off at exactly this point. If tag is Nothing, returns True if any tag is toggled off at this point.

Note that if textIterEndsTag returns True, it means that iter is at the end of the tagged range, but that the character at iter is outside the tagged range. In other words, unlike textIterStartsTag, if textIterEndsTag returns True, textIterHasTag will return False for the same parameters.

Determines whether iter ends a natural-language word. Word breaks are determined by Pango and should be correct for nearly any language (if not, the correct fix would be to the Pango word break algorithms).

Tests whether two iterators are equal, using the fastest possible mechanism. This function is very fast; you can expect it to perform better than e.g. getting the character offset for each iterator and comparing the offsets yourself. Also, it’s a bit faster than textIterCompare.

Moves iter forward by one character offset. Note that images embedded in the buffer occupy 1 character slot, so textIterForwardChar may actually move onto an image instead of a character, if you have images in your buffer. If iter is the end iterator or one character before it, iter will now point at the end iterator, and textIterForwardChar returns False for convenience when writing loops.

Moves count characters if possible (if count would move past the start or end of the buffer, moves to the start or end of the buffer). The return value indicates whether the new position of iter is different from its original position, and dereferenceable (the last iterator in the buffer is not dereferenceable). If count is 0, the function does nothing and returns False.

Moves iter forward by a single cursor position. Cursor positions are (unsurprisingly) positions where the cursor can appear. Perhaps surprisingly, there may not be a cursor position between all characters. The most common example for European languages would be a carriage return/newline sequence. For some Unicode characters, the equivalent of say the letter “a” with an accent mark will be represented as two characters, first the letter then a "combining mark" that causes the accent to be rendered; so the cursor can’t go between those two characters. See also the LogAttr-struct and break function.

Moves up to count cursor positions. See textIterForwardCursorPosition for details.

Advances iter, calling pred on each character. If pred returns True, returns True and stops scanning. If pred never returns True, iter is set to limit if limit is non-Nothing, otherwise to the end iterator.

Moves iter to the start of the next line. If the iter is already on the last line of the buffer, moves the iter to the end of the current line. If after the operation, the iter is at the end of the buffer and not dereferencable, returns False. Otherwise, returns True.

Moves count lines forward, if possible (if count would move past the start or end of the buffer, moves to the start or end of the buffer). The return value indicates whether the iterator moved onto a dereferenceable position; if the iterator didn’t move, or moved onto the end iterator, then False is returned. If count is 0, the function does nothing and returns False. If count is negative, moves backward by 0 - count lines.

Searches forward for str. Any match is returned by setting matchStart to the first character of the match and matchEnd to the first character after the match. The search will not continue past limit. Note that a search is a linear or O(n) operation, so you may wish to use limit to avoid locking up your UI on large buffers.

matchStart will never be set to a TextIter located before iter, even if there is a possible matchEnd after or at iter.

Moves forward to the next sentence end. (If iter is at the end of a sentence, moves to the next end of sentence.) Sentence boundaries are determined by Pango and should be correct for nearly any language (if not, the correct fix would be to the Pango text boundary algorithms).

Calls textIterForwardSentenceEnd count times (or until textIterForwardSentenceEnd returns False). If count is negative, moves backward instead of forward.

Moves iter forward to the “end iterator,” which points one past the last valid character in the buffer. textIterGetChar called on the end iterator returns 0, which is convenient for writing loops.

Moves the iterator to point to the paragraph delimiter characters, which will be either a newline, a carriage return, a carriage return/newline in sequence, or the Unicode paragraph separator character. If the iterator is already at the paragraph delimiter characters, moves to the paragraph delimiter characters for the next line. If iter is on the last line in the buffer, which does not end in paragraph delimiters, moves to the end iterator (end of the last line), and returns False.

Moves forward to the next toggle (on or off) of the TextTag tag, or to the next toggle of any tag if tag is Nothing. If no matching tag toggles are found, returns False, otherwise True. Does not return toggles located at iter, only toggles after iter. Sets iter to the location of the toggle, or to the end of the buffer if no toggle is found.

Moves iter forward to the next visible cursor position. See textIterForwardCursorPosition for details.

Since: 2.4

Moves up to count visible cursor positions. See textIterForwardCursorPosition for details.

Since: 2.4

Moves iter to the start of the next visible line. Returns True if there was a next line to move to, and False if iter was simply moved to the end of the buffer and is now not dereferenceable, or if iter was already at the end of the buffer.

Since: 2.8

Moves count visible lines forward, if possible (if count would move past the start or end of the buffer, moves to the start or end of the buffer). The return value indicates whether the iterator moved onto a dereferenceable position; if the iterator didn’t move, or moved onto the end iterator, then False is returned. If count is 0, the function does nothing and returns False. If count is negative, moves backward by 0 - count lines.

Since: 2.8

Moves forward to the next visible word end. (If iter is currently on a word end, moves forward to the next one after that.) Word breaks are determined by Pango and should be correct for nearly any language (if not, the correct fix would be to the Pango word break algorithms).

Since: 2.4

Calls textIterForwardVisibleWordEnd up to count times.

Since: 2.4

Moves forward to the next word end. (If iter is currently on a word end, moves forward to the next one after that.) Word breaks are determined by Pango and should be correct for nearly any language (if not, the correct fix would be to the Pango word break algorithms).

Calls textIterForwardWordEnd up to count times.

Free an iterator allocated on the heap. This function is intended for use in language bindings, and is not especially useful for applications, because iterators can simply be allocated on the stack.

Computes the effect of any tags applied to this spot in the text. The values parameter should be initialized to the default settings you wish to use if no tags are in effect. You’d typically obtain the defaults from textViewGetDefaultAttributes.

textIterGetAttributes will modify values, applying the effects of any tags present at iter. If any tags affected values, the function returns True.

Returns the TextBuffer this iterator is associated with.

Returns the number of bytes in the line containing iter, including the paragraph delimiters.

The Unicode character at this iterator is returned. (Equivalent to operator* on a C++ iterator.) If the element at this iterator is a non-character element, such as an image embedded in the buffer, the Unicode “unknown” character 0xFFFC is returned. If invoked on the end iterator, zero is returned; zero is not a valid Unicode character. So you can write a loop which ends when textIterGetChar returns 0.

Returns the number of characters in the line containing iter, including the paragraph delimiters.

If the location at iter contains a child anchor, the anchor is returned (with no new reference count added). Otherwise, Nothing is returned.

A convenience wrapper around textIterGetAttributes, which returns the language in effect at iter. If no tags affecting language apply to iter, the return value is identical to that of getDefaultLanguage.

Returns the line number containing the iterator. Lines in a TextBuffer are numbered beginning with 0 for the first line in the buffer.

Returns the byte index of the iterator, counting from the start of a newline-terminated line. Remember that TextBuffer encodes text in UTF-8, and that characters can require a variable number of bytes to represent.

Returns the character offset of the iterator, counting from the start of a newline-terminated line. The first character on the line has offset 0.

Returns a list of all TextMark at this location. Because marks are not iterable (they don’t take up any "space" in the buffer, they are just marks in between iterable locations), multiple marks can exist in the same place. The returned list is not in any meaningful order.

Returns the character offset of an iterator. Each character in a TextBuffer has an offset, starting with 0 for the first character in the buffer. Use textBufferGetIterAtOffset to convert an offset back into an iterator.

If the element at iter is a pixbuf, the pixbuf is returned (with no new reference count added). Otherwise, Nothing is returned.

Returns the text in the given range. A “slice” is an array of characters encoded in UTF-8 format, including the Unicode “unknown” character 0xFFFC for iterable non-character elements in the buffer, such as images. Because images are encoded in the slice, byte and character offsets in the returned array will correspond to byte offsets in the text buffer. Note that 0xFFFC can occur in normal text as well, so it is not a reliable indicator that a pixbuf or widget is in the buffer.

Returns a list of tags that apply to iter, in ascending order of priority (highest-priority tags are last). The TextTag in the list don’t have a reference added, but you have to free the list itself.

Returns text in the given range. If the range contains non-text elements such as images, the character and byte offsets in the returned string will not correspond to character and byte offsets in the buffer. If you want offsets to correspond, see textIterGetSlice.

Returns a list of TextTag that are toggled on or off at this point. (If toggledOn is True, the list contains tags that are toggled on.) If a tag is toggled on at iter, then some non-empty range of characters following iter has that tag applied to it. If a tag is toggled off, then some non-empty range following iter does not have the tag applied to it.

Returns the number of bytes from the start of the line to the given iter, not counting bytes that are invisible due to tags with the “invisible” flag toggled on.

Returns the offset in characters from the start of the line to the given iter, not counting characters that are invisible due to tags with the “invisible” flag toggled on.

Like textIterGetSlice, but invisible text is not included. Invisible text is usually invisible because a TextTag with the “invisible” attribute turned on has been applied to it.

Like textIterGetText, but invisible text is not included. Invisible text is usually invisible because a TextTag with the “invisible” attribute turned on has been applied to it.

Returns True if iter points to a character that is part of a range tagged with tag. See also textIterStartsTag and textIterEndsTag.

Checks whether iter falls in the range [start, end). start and end must be in ascending order.

Determines whether iter is inside a sentence (as opposed to in between two sentences, e.g. after a period and before the first letter of the next sentence). Sentence boundaries are determined by Pango and should be correct for nearly any language (if not, the correct fix would be to the Pango text boundary algorithms).

Determines whether the character pointed by iter is part of a natural-language word (as opposed to say inside some whitespace). Word breaks are determined by Pango and should be correct for nearly any language (if not, the correct fix would be to the Pango word break algorithms).

Note that if textIterStartsWord returns True, then this function returns True too, since iter points to the first character of the word.

See textIterForwardCursorPosition or LogAttr or break for details on what a cursor position is.

Returns True if iter is the end iterator, i.e. one past the last dereferenceable iterator in the buffer. textIterIsEnd is the most efficient way to check whether an iterator is the end iterator.

Returns True if iter is the first iterator in the buffer, that is if iter has a character offset of 0.

Swaps the value of first and second if second comes before first in the buffer. That is, ensures that first and second are in sequence. Most text buffer functions that take a range call this automatically on your behalf, so there’s no real reason to call it yourself in those cases. There are some exceptions, such as textIterInRange, that expect a pre-sorted range.

Moves iterator iter to the start of the line lineNumber. If lineNumber is negative or larger than the number of lines in the buffer, moves iter to the start of the last line in the buffer.

Same as textIterSetLineOffset, but works with a byte index. The given byte index must be at the start of a character, it can’t be in the middle of a UTF-8 encoded character.

Moves iter within a line, to a new character (not byte) offset. The given character offset must be less than or equal to the number of characters in the line; if equal, iter moves to the start of the next line. See textIterSetLineIndex if you have a byte index rather than a character offset.

Sets iter to point to charOffset. charOffset counts from the start of the entire text buffer, starting with 0.

Like textIterSetLineIndex, but the index is in visible bytes, i.e. text with a tag making it invisible is not counted in the index.

Like textIterSetLineOffset, but the offset is in visible characters, i.e. text with a tag making it invisible is not counted in the offset.

Returns True if iter begins a paragraph, i.e. if textIterGetLineOffset would return 0. However this function is potentially more efficient than textIterGetLineOffset because it doesn’t have to compute the offset, it just has to see whether it’s 0.

Determines whether iter begins a sentence. Sentence boundaries are determined by Pango and should be correct for nearly any language (if not, the correct fix would be to the Pango text boundary algorithms).

Returns True if tag is toggled on at exactly this point. If tag is Nothing, returns True if any tag is toggled on at this point.

Note that if textIterStartsTag returns True, it means that iter is at the beginning of the tagged range, and that the character at iter is inside the tagged range. In other words, unlike textIterEndsTag, if textIterStartsTag returns True, textIterHasTag will also return True for the same parameters.

Since: 3.20

Determines whether iter begins a natural-language word. Word breaks are determined by Pango and should be correct for nearly any language (if not, the correct fix would be to the Pango word break algorithms).

This is equivalent to (textIterStartsTag || textIterEndsTag), i.e. it tells you whether a range with tag applied to it begins or ends at iter.