--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/icu/unicode/ushape.h Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,234 @@
+/*
+******************************************************************************
+*
+* Copyright (C) 2000-2004, International Business Machines
+* Corporation and others. All Rights Reserved.
+*
+******************************************************************************
+* file name: ushape.h
+* encoding: US-ASCII
+* tab size: 8 (not used)
+* indentation:4
+*
+* created on: 2000jun29
+* created by: Markus W. Scherer
+*/
+
+#ifndef __USHAPE_H__
+#define __USHAPE_H__
+
+#include "unicode/utypes.h"
+
+/**
+ * \file
+ * \brief C API: Arabic shaping
+ *
+ */
+
+/**
+ * Shape Arabic text on a character basis.
+ *
+ * <p>This function performs basic operations for "shaping" Arabic text. It is most
+ * useful for use with legacy data formats and legacy display technology
+ * (simple terminals). All operations are performed on Unicode characters.</p>
+ *
+ * <p>Text-based shaping means that some character code points in the text are
+ * replaced by others depending on the context. It transforms one kind of text
+ * into another. In comparison, modern displays for Arabic text select
+ * appropriate, context-dependent font glyphs for each text element, which means
+ * that they transform text into a glyph vector.</p>
+ *
+ * <p>Text transformations are necessary when modern display technology is not
+ * available or when text needs to be transformed to or from legacy formats that
+ * use "shaped" characters. Since the Arabic script is cursive, connecting
+ * adjacent letters to each other, computers select images for each letter based
+ * on the surrounding letters. This usually results in four images per Arabic
+ * letter: initial, middle, final, and isolated forms. In Unicode, on the other
+ * hand, letters are normally stored abstract, and a display system is expected
+ * to select the necessary glyphs. (This makes searching and other text
+ * processing easier because the same letter has only one code.) It is possible
+ * to mimic this with text transformations because there are characters in
+ * Unicode that are rendered as letters with a specific shape
+ * (or cursive connectivity). They were included for interoperability with
+ * legacy systems and codepages, and for unsophisticated display systems.</p>
+ *
+ * <p>A second kind of text transformations is supported for Arabic digits:
+ * For compatibility with legacy codepages that only include European digits,
+ * it is possible to replace one set of digits by another, changing the
+ * character code points. These operations can be performed for either
+ * Arabic-Indic Digits (U+0660...U+0669) or Eastern (Extended) Arabic-Indic
+ * digits (U+06f0...U+06f9).</p>
+ *
+ * <p>Some replacements may result in more or fewer characters (code points).
+ * By default, this means that the destination buffer may receive text with a
+ * length different from the source length. Some legacy systems rely on the
+ * length of the text to be constant. They expect extra spaces to be added
+ * or consumed either next to the affected character or at the end of the
+ * text.</p>
+ *
+ * <p>For details about the available operations, see the description of the
+ * <code>U_SHAPE_...</code> options.</p>
+ *
+ * @param source The input text.
+ *
+ * @param sourceLength The number of UChars in <code>source</code>.
+ *
+ * @param dest The destination buffer that will receive the results of the
+ * requested operations. It may be <code>NULL</code> only if
+ * <code>destSize</code> is 0. The source and destination must not
+ * overlap.
+ *
+ * @param destSize The size (capacity) of the destination buffer in UChars.
+ * If <code>destSize</code> is 0, then no output is produced,
+ * but the necessary buffer size is returned ("preflighting").
+ *
+ * @param options This is a 32-bit set of flags that specify the operations
+ * that are performed on the input text. If no error occurs,
+ * then the result will always be written to the destination
+ * buffer.
+ *
+ * @param pErrorCode must be a valid pointer to an error code value,
+ * which must not indicate a failure before the function call.
+ *
+ * @return The number of UChars written to the destination buffer.
+ * If an error occured, then no output was written, or it may be
+ * incomplete. If <code>U_BUFFER_OVERFLOW_ERROR</code> is set, then
+ * the return value indicates the necessary destination buffer size.
+ * @stable ICU 2.0
+ */
+U_STABLE int32_t U_EXPORT2
+u_shapeArabic(const UChar *source, int32_t sourceLength,
+ UChar *dest, int32_t destSize,
+ uint32_t options,
+ UErrorCode *pErrorCode);
+
+/**
+ * Memory option: allow the result to have a different length than the source.
+ * @stable ICU 2.0
+ */
+#define U_SHAPE_LENGTH_GROW_SHRINK 0
+
+/**
+ * Memory option: the result must have the same length as the source.
+ * If more room is necessary, then try to consume spaces next to modified characters.
+ * @stable ICU 2.0
+ */
+#define U_SHAPE_LENGTH_FIXED_SPACES_NEAR 1
+
+/**
+ * Memory option: the result must have the same length as the source.
+ * If more room is necessary, then try to consume spaces at the end of the text.
+ * @stable ICU 2.0
+ */
+#define U_SHAPE_LENGTH_FIXED_SPACES_AT_END 2
+
+/**
+ * Memory option: the result must have the same length as the source.
+ * If more room is necessary, then try to consume spaces at the beginning of the text.
+ * @stable ICU 2.0
+ */
+#define U_SHAPE_LENGTH_FIXED_SPACES_AT_BEGINNING 3
+
+/** Bit mask for memory options. @stable ICU 2.0 */
+#define U_SHAPE_LENGTH_MASK 3
+
+
+/** Direction indicator: the source is in logical (keyboard) order. @stable ICU 2.0 */
+#define U_SHAPE_TEXT_DIRECTION_LOGICAL 0
+
+/**
+ * Direction indicator:
+ * the source is in visual LTR order,
+ * the leftmost displayed character stored first.
+ * @stable ICU 2.0
+ */
+#define U_SHAPE_TEXT_DIRECTION_VISUAL_LTR 4
+
+/** Bit mask for direction indicators. @stable ICU 2.0 */
+#define U_SHAPE_TEXT_DIRECTION_MASK 4
+
+
+/** Letter shaping option: do not perform letter shaping. @stable ICU 2.0 */
+#define U_SHAPE_LETTERS_NOOP 0
+
+/** Letter shaping option: replace abstract letter characters by "shaped" ones. @stable ICU 2.0 */
+#define U_SHAPE_LETTERS_SHAPE 8
+
+/** Letter shaping option: replace "shaped" letter characters by abstract ones. @stable ICU 2.0 */
+#define U_SHAPE_LETTERS_UNSHAPE 0x10
+
+/**
+ * Letter shaping option: replace abstract letter characters by "shaped" ones.
+ * The only difference with U_SHAPE_LETTERS_SHAPE is that Tashkeel letters
+ * are always "shaped" into the isolated form instead of the medial form
+ * (selecting code points from the Arabic Presentation Forms-B block).
+ * @stable ICU 2.0
+ */
+#define U_SHAPE_LETTERS_SHAPE_TASHKEEL_ISOLATED 0x18
+
+/** Bit mask for letter shaping options. @stable ICU 2.0 */
+#define U_SHAPE_LETTERS_MASK 0x18
+
+
+/** Digit shaping option: do not perform digit shaping. @stable ICU 2.0 */
+#define U_SHAPE_DIGITS_NOOP 0
+
+/**
+ * Digit shaping option:
+ * Replace European digits (U+0030...) by Arabic-Indic digits.
+ * @stable ICU 2.0
+ */
+#define U_SHAPE_DIGITS_EN2AN 0x20
+
+/**
+ * Digit shaping option:
+ * Replace Arabic-Indic digits by European digits (U+0030...).
+ * @stable ICU 2.0
+ */
+#define U_SHAPE_DIGITS_AN2EN 0x40
+
+/**
+ * Digit shaping option:
+ * Replace European digits (U+0030...) by Arabic-Indic digits if the most recent
+ * strongly directional character is an Arabic letter
+ * (<code>u_charDirection()</code> result <code>U_RIGHT_TO_LEFT_ARABIC</code> [AL]).<br>
+ * The direction of "preceding" depends on the direction indicator option.
+ * For the first characters, the preceding strongly directional character
+ * (initial state) is assumed to be not an Arabic letter
+ * (it is <code>U_LEFT_TO_RIGHT</code> [L] or <code>U_RIGHT_TO_LEFT</code> [R]).
+ * @stable ICU 2.0
+ */
+#define U_SHAPE_DIGITS_ALEN2AN_INIT_LR 0x60
+
+/**
+ * Digit shaping option:
+ * Replace European digits (U+0030...) by Arabic-Indic digits if the most recent
+ * strongly directional character is an Arabic letter
+ * (<code>u_charDirection()</code> result <code>U_RIGHT_TO_LEFT_ARABIC</code> [AL]).<br>
+ * The direction of "preceding" depends on the direction indicator option.
+ * For the first characters, the preceding strongly directional character
+ * (initial state) is assumed to be an Arabic letter.
+ * @stable ICU 2.0
+ */
+#define U_SHAPE_DIGITS_ALEN2AN_INIT_AL 0x80
+
+/** Not a valid option value. May be replaced by a new option. @stable ICU 2.0 */
+#define U_SHAPE_DIGITS_RESERVED 0xa0
+
+/** Bit mask for digit shaping options. @stable ICU 2.0 */
+#define U_SHAPE_DIGITS_MASK 0xe0
+
+
+/** Digit type option: Use Arabic-Indic digits (U+0660...U+0669). @stable ICU 2.0 */
+#define U_SHAPE_DIGIT_TYPE_AN 0
+
+/** Digit type option: Use Eastern (Extended) Arabic-Indic digits (U+06f0...U+06f9). @stable ICU 2.0 */
+#define U_SHAPE_DIGIT_TYPE_AN_EXTENDED 0x100
+
+/** Not a valid option value. May be replaced by a new option. @stable ICU 2.0 */
+#define U_SHAPE_DIGIT_TYPE_RESERVED 0x200
+
+/** Bit mask for digit type options. @stable ICU 2.0 */
+#define U_SHAPE_DIGIT_TYPE_MASK 0x3f00
+
+#endif