443 lines
18 KiB
C
443 lines
18 KiB
C
/*
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******************************************************************************
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*
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* Copyright (C) 2000-2009, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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******************************************************************************
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* file name: ushape.h
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2000jun29
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* created by: Markus W. Scherer
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*/
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#ifndef __USHAPE_H__
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#define __USHAPE_H__
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#include "unicode/utypes.h"
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/**
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* \file
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* \brief C API: Arabic shaping
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*
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*/
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/**
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* Shape Arabic text on a character basis.
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*
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* <p>This function performs basic operations for "shaping" Arabic text. It is most
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* useful for use with legacy data formats and legacy display technology
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* (simple terminals). All operations are performed on Unicode characters.</p>
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*
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* <p>Text-based shaping means that some character code points in the text are
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* replaced by others depending on the context. It transforms one kind of text
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* into another. In comparison, modern displays for Arabic text select
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* appropriate, context-dependent font glyphs for each text element, which means
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* that they transform text into a glyph vector.</p>
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*
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* <p>Text transformations are necessary when modern display technology is not
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* available or when text needs to be transformed to or from legacy formats that
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* use "shaped" characters. Since the Arabic script is cursive, connecting
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* adjacent letters to each other, computers select images for each letter based
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* on the surrounding letters. This usually results in four images per Arabic
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* letter: initial, middle, final, and isolated forms. In Unicode, on the other
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* hand, letters are normally stored abstract, and a display system is expected
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* to select the necessary glyphs. (This makes searching and other text
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* processing easier because the same letter has only one code.) It is possible
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* to mimic this with text transformations because there are characters in
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* Unicode that are rendered as letters with a specific shape
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* (or cursive connectivity). They were included for interoperability with
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* legacy systems and codepages, and for unsophisticated display systems.</p>
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*
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* <p>A second kind of text transformations is supported for Arabic digits:
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* For compatibility with legacy codepages that only include European digits,
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* it is possible to replace one set of digits by another, changing the
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* character code points. These operations can be performed for either
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* Arabic-Indic Digits (U+0660...U+0669) or Eastern (Extended) Arabic-Indic
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* digits (U+06f0...U+06f9).</p>
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*
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* <p>Some replacements may result in more or fewer characters (code points).
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* By default, this means that the destination buffer may receive text with a
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* length different from the source length. Some legacy systems rely on the
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* length of the text to be constant. They expect extra spaces to be added
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* or consumed either next to the affected character or at the end of the
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* text.</p>
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*
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* <p>For details about the available operations, see the description of the
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* <code>U_SHAPE_...</code> options.</p>
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*
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* @param source The input text.
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*
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* @param sourceLength The number of UChars in <code>source</code>.
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*
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* @param dest The destination buffer that will receive the results of the
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* requested operations. It may be <code>NULL</code> only if
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* <code>destSize</code> is 0. The source and destination must not
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* overlap.
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*
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* @param destSize The size (capacity) of the destination buffer in UChars.
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* If <code>destSize</code> is 0, then no output is produced,
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* but the necessary buffer size is returned ("preflighting").
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*
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* @param options This is a 32-bit set of flags that specify the operations
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* that are performed on the input text. If no error occurs,
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* then the result will always be written to the destination
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* buffer.
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*
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* @param pErrorCode must be a valid pointer to an error code value,
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* which must not indicate a failure before the function call.
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*
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* @return The number of UChars written to the destination buffer.
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* If an error occured, then no output was written, or it may be
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* incomplete. If <code>U_BUFFER_OVERFLOW_ERROR</code> is set, then
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* the return value indicates the necessary destination buffer size.
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* @stable ICU 2.0
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*/
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U_STABLE int32_t U_EXPORT2
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u_shapeArabic(const UChar *source, int32_t sourceLength,
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UChar *dest, int32_t destSize,
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uint32_t options,
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UErrorCode *pErrorCode);
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/**
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* Memory option: allow the result to have a different length than the source.
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* Affects: LamAlef options
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* @stable ICU 2.0
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*/
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#define U_SHAPE_LENGTH_GROW_SHRINK 0
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/**
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* Memory option: allow the result to have a different length than the source.
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* Affects: LamAlef options
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* This option is an alias to U_SHAPE_LENGTH_GROW_SHRINK
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*/
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#define U_SHAPE_LAMALEF_RESIZE 0
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/**
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* Memory option: the result must have the same length as the source.
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* If more room is necessary, then try to consume spaces next to modified characters.
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* @stable ICU 2.0
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*/
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#define U_SHAPE_LENGTH_FIXED_SPACES_NEAR 1
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/**
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* Memory option: the result must have the same length as the source.
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* If more room is necessary, then try to consume spaces next to modified characters.
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* Affects: LamAlef options
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* This option is an alias to U_SHAPE_LENGTH_FIXED_SPACES_NEAR
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*/
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#define U_SHAPE_LAMALEF_NEAR 1
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/**
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* Memory option: the result must have the same length as the source.
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* If more room is necessary, then try to consume spaces at the end of the text.
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* @stable ICU 2.0
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*/
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#define U_SHAPE_LENGTH_FIXED_SPACES_AT_END 2
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/**
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* Memory option: the result must have the same length as the source.
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* If more room is necessary, then try to consume spaces at the end of the text.
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* Affects: LamAlef options
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* This option is an alias to U_SHAPE_LENGTH_FIXED_SPACES_AT_END
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*/
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#define U_SHAPE_LAMALEF_END 2
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/**
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* Memory option: the result must have the same length as the source.
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* If more room is necessary, then try to consume spaces at the beginning of the text.
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* @stable ICU 2.0
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*/
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#define U_SHAPE_LENGTH_FIXED_SPACES_AT_BEGINNING 3
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/**
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* Memory option: the result must have the same length as the source.
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* If more room is necessary, then try to consume spaces at the beginning of the text.
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* Affects: LamAlef options
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* This option is an alias to U_SHAPE_LENGTH_FIXED_SPACES_AT_BEGINNING
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*/
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#define U_SHAPE_LAMALEF_BEGIN 3
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/**
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* Memory option: the result must have the same length as the source.
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* Shaping Mode: For each LAMALEF character found, expand LAMALEF using space at end.
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* If there is no space at end, use spaces at beginning of the buffer. If there
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* is no space at beginning of the buffer, use spaces at the near (i.e. the space
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* after the LAMALEF character).
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* If there are no spaces found, an error U_NO_SPACE_AVAILABLE (as defined in utypes.h)
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* will be set in pErrorCode
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*
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* Deshaping Mode: Perform the same function as the flag equals U_SHAPE_LAMALEF_END.
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* Affects: LamAlef options
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*/
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#define U_SHAPE_LAMALEF_AUTO 0x10000
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/** Bit mask for memory options. @stable ICU 2.0 */
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#define U_SHAPE_LENGTH_MASK 0x10003 /* Changed old value 3 */
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/** Bit mask for LamAlef memory options. */
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#define U_SHAPE_LAMALEF_MASK 0x10003 /* updated */
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/** Direction indicator: the source is in logical (keyboard) order. @stable ICU 2.0 */
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#define U_SHAPE_TEXT_DIRECTION_LOGICAL 0
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/**
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* Direction indicator:
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* the source is in visual RTL order,
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* the rightmost displayed character stored first.
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* This option is an alias to U_SHAPE_TEXT_DIRECTION_LOGICAL
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*/
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#define U_SHAPE_TEXT_DIRECTION_VISUAL_RTL 0
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/**
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* Direction indicator:
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* the source is in visual LTR order,
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* the leftmost displayed character stored first.
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* @stable ICU 2.0
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*/
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#define U_SHAPE_TEXT_DIRECTION_VISUAL_LTR 4
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/** Bit mask for direction indicators. @stable ICU 2.0 */
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#define U_SHAPE_TEXT_DIRECTION_MASK 4
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/** Letter shaping option: do not perform letter shaping. @stable ICU 2.0 */
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#define U_SHAPE_LETTERS_NOOP 0
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/** Letter shaping option: replace abstract letter characters by "shaped" ones. @stable ICU 2.0 */
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#define U_SHAPE_LETTERS_SHAPE 8
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/** Letter shaping option: replace "shaped" letter characters by abstract ones. @stable ICU 2.0 */
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#define U_SHAPE_LETTERS_UNSHAPE 0x10
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/**
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* Letter shaping option: replace abstract letter characters by "shaped" ones.
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* The only difference with U_SHAPE_LETTERS_SHAPE is that Tashkeel letters
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* are always "shaped" into the isolated form instead of the medial form
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* (selecting code points from the Arabic Presentation Forms-B block).
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* @stable ICU 2.0
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*/
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#define U_SHAPE_LETTERS_SHAPE_TASHKEEL_ISOLATED 0x18
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/** Bit mask for letter shaping options. @stable ICU 2.0 */
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#define U_SHAPE_LETTERS_MASK 0x18
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/** Digit shaping option: do not perform digit shaping. @stable ICU 2.0 */
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#define U_SHAPE_DIGITS_NOOP 0
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/**
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* Digit shaping option:
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* Replace European digits (U+0030...) by Arabic-Indic digits.
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* @stable ICU 2.0
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*/
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#define U_SHAPE_DIGITS_EN2AN 0x20
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/**
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* Digit shaping option:
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* Replace Arabic-Indic digits by European digits (U+0030...).
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* @stable ICU 2.0
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*/
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#define U_SHAPE_DIGITS_AN2EN 0x40
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/**
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* Digit shaping option:
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* Replace European digits (U+0030...) by Arabic-Indic digits if the most recent
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* strongly directional character is an Arabic letter
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* (<code>u_charDirection()</code> result <code>U_RIGHT_TO_LEFT_ARABIC</code> [AL]).<br>
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* The direction of "preceding" depends on the direction indicator option.
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* For the first characters, the preceding strongly directional character
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* (initial state) is assumed to be not an Arabic letter
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* (it is <code>U_LEFT_TO_RIGHT</code> [L] or <code>U_RIGHT_TO_LEFT</code> [R]).
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* @stable ICU 2.0
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*/
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#define U_SHAPE_DIGITS_ALEN2AN_INIT_LR 0x60
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/**
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* Digit shaping option:
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* Replace European digits (U+0030...) by Arabic-Indic digits if the most recent
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* strongly directional character is an Arabic letter
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* (<code>u_charDirection()</code> result <code>U_RIGHT_TO_LEFT_ARABIC</code> [AL]).<br>
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* The direction of "preceding" depends on the direction indicator option.
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* For the first characters, the preceding strongly directional character
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* (initial state) is assumed to be an Arabic letter.
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* @stable ICU 2.0
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*/
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#define U_SHAPE_DIGITS_ALEN2AN_INIT_AL 0x80
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/** Not a valid option value. May be replaced by a new option. @stable ICU 2.0 */
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#define U_SHAPE_DIGITS_RESERVED 0xa0
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/** Bit mask for digit shaping options. @stable ICU 2.0 */
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#define U_SHAPE_DIGITS_MASK 0xe0
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/** Digit type option: Use Arabic-Indic digits (U+0660...U+0669). @stable ICU 2.0 */
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#define U_SHAPE_DIGIT_TYPE_AN 0
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/** Digit type option: Use Eastern (Extended) Arabic-Indic digits (U+06f0...U+06f9). @stable ICU 2.0 */
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#define U_SHAPE_DIGIT_TYPE_AN_EXTENDED 0x100
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/** Not a valid option value. May be replaced by a new option. @stable ICU 2.0 */
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#define U_SHAPE_DIGIT_TYPE_RESERVED 0x200
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/** Bit mask for digit type options. @stable ICU 2.0 */
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#define U_SHAPE_DIGIT_TYPE_MASK 0x300 /* I need to change this from 0x3f00 to 0x300 */
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/**
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* Tashkeel aggregation option:
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* Replaces any combination of U+0651 with one of
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* U+064C, U+064D, U+064E, U+064F, U+0650 with
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* U+FC5E, U+FC5F, U+FC60, U+FC61, U+FC62 consecutively.
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* @stable ICU 3.6
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*/
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#define U_SHAPE_AGGREGATE_TASHKEEL 0x4000
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/** Tashkeel aggregation option: do not aggregate tashkeels. @stable ICU 3.6 */
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#define U_SHAPE_AGGREGATE_TASHKEEL_NOOP 0
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/** Bit mask for tashkeel aggregation. @stable ICU 3.6 */
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#define U_SHAPE_AGGREGATE_TASHKEEL_MASK 0x4000
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/**
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* Presentation form option:
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* Don't replace Arabic Presentation Forms-A and Arabic Presentation Forms-B
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* characters with 0+06xx characters, before shaping.
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* @stable ICU 3.6
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*/
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#define U_SHAPE_PRESERVE_PRESENTATION 0x8000
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/** Presentation form option:
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* Replace Arabic Presentation Forms-A and Arabic Presentationo Forms-B with
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* their unshaped correspondants in range 0+06xx, before shaping.
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* @stable ICU 3.6
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*/
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#define U_SHAPE_PRESERVE_PRESENTATION_NOOP 0
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/** Bit mask for preserve presentation form. @stable ICU 3.6 */
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#define U_SHAPE_PRESERVE_PRESENTATION_MASK 0x8000
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/* Seen Tail option */
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/**
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* Memory option: the result must have the same length as the source.
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* Shaping mode: The SEEN family character will expand into two characters using space near
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* the SEEN family character(i.e. the space after the character).
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* If there are no spaces found, an error U_NO_SPACE_AVAILABLE (as defined in utypes.h)
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* will be set in pErrorCode
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*
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* De-shaping mode: Any Seen character followed by Tail character will be
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* replaced by one cell Seen and a space will replace the Tail.
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* Affects: Seen options
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*/
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#define U_SHAPE_SEEN_TWOCELL_NEAR 0x200000
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/** Bit mask for Seen memory options. */
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#define U_SHAPE_SEEN_MASK 0x700000
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/* YehHamza option */
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/**
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* Memory option: the result must have the same length as the source.
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* Shaping mode: The YEHHAMZA character will expand into two characters using space near it
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* (i.e. the space after the character
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* If there are no spaces found, an error U_NO_SPACE_AVAILABLE (as defined in utypes.h)
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* will be set in pErrorCode
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*
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* De-shaping mode: Any Yeh (final or isolated) character followed by Hamza character will be
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* replaced by one cell YehHamza and space will replace the Hamza.
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* Affects: YehHamza options
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*/
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#define U_SHAPE_YEHHAMZA_TWOCELL_NEAR 0x1000000
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/** Bit mask for YehHamza memory options. */
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#define U_SHAPE_YEHHAMZA_MASK 0x3800000
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/* New Tashkeel options */
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/**
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* Memory option: the result must have the same length as the source.
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* Shaping mode: Tashkeel characters will be replaced by spaces.
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* Spaces will be placed at beginning of the buffer
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*
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* De-shaping mode: N/A
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* Affects: Tashkeel options
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*/
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#define U_SHAPE_TASHKEEL_BEGIN 0x40000
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/**
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* Memory option: the result must have the same length as the source.
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* Shaping mode: Tashkeel characters will be replaced by spaces.
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* Spaces will be placed at end of the buffer
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*
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* De-shaping mode: N/A
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* Affects: Tashkeel options
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*/
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#define U_SHAPE_TASHKEEL_END 0x60000
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/**
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* Memory option: allow the result to have a different length than the source.
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* Shaping mode: Tashkeel characters will be removed, buffer length will shrink.
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* De-shaping mode: N/A
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*
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* Affect: Tashkeel options
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*/
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#define U_SHAPE_TASHKEEL_RESIZE 0x80000
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/**
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* Memory option: the result must have the same length as the source.
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* Shaping mode: Tashkeel characters will be replaced by Tatweel if it is connected to adjacent
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* characters (i.e. shaped on Tatweel) or replaced by space if it is not connected.
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*
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* De-shaping mode: N/A
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* Affects: YehHamza options
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*/
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#define U_SHAPE_TASHKEEL_REPLACE_BY_TATWEEL 0xC0000
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/** Bit mask for Tashkeel replacement with Space or Tatweel memory options. */
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#define U_SHAPE_TASHKEEL_MASK 0xE0000
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/* Space location Control options */
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/**
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* This option affect the meaning of BEGIN and END options. if this option is not used the default
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* for BEGIN and END will be as following:
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* The Default (for both Visual LTR, Visual RTL and Logical Text)
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* 1. BEGIN always refers to the start address of physical memory.
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* 2. END always refers to the end address of physical memory.
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*
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* If this option is used it will swap the meaning of BEGIN and END only for Visual LTR text.
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*
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* The effect on BEGIN and END Memory Options will be as following:
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* A. BEGIN For Visual LTR text: This will be the beginning (right side) of the visual text(
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* corresponding to the physical memory address end for Visual LTR text, Same as END in
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* default behavior)
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* B. BEGIN For Logical text: Same as BEGIN in default behavior.
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* C. END For Visual LTR text: This will be the end (left side) of the visual text (corresponding
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* to the physical memory address beginning for Visual LTR text, Same as BEGIN in default behavior.
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* D. END For Logical text: Same as END in default behavior).
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* Affects: All LamAlef BEGIN, END and AUTO options.
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*/
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#define U_SHAPE_SPACES_RELATIVE_TO_TEXT_BEGIN_END 0x4000000
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/** Bit mask for swapping BEGIN and END for Visual LTR text */
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#define U_SHAPE_SPACES_RELATIVE_TO_TEXT_MASK 0x4000000
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/**
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* If this option is used, shaping will use the new Unicode code point for TAIL (i.e. 0xFE73).
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* If this option is not specified (Default), old unofficial Unicode TAIL code point is used (i.e. 0x200B)
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* De-shaping will not use this option as it will always search for both the new Unicode code point for the
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* TAIL (i.e. 0xFE73) or the old unofficial Unicode TAIL code point (i.e. 0x200B) and de-shape the
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* Seen-Family letter accordingly.
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*
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* Shaping Mode: Only shaping.
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* De-shaping Mode: N/A.
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* Affects: All Seen options
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*/
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#define SHAPE_TAIL_NEW_UNICODE 0x8000000
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/** Bit mask for new Unicode Tail option */
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#define SHAPE_TAIL_TYPE_MASK 0x8000000
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#endif
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