ubiditransform.cpp | Explore in Territory

/*
******************************************************************************
*
* © 2016 and later: Unicode, Inc. and others.
* License & terms of use: http://www.unicode.org/copyright.html
*
******************************************************************************
*   file name:  ubiditransform.c
*   encoding:   UTF-8
*   tab size:   8 (not used)
*   indentation:4
*
*   created on: 2016jul24
*   created by: Lina Kemmel
*
*/

#include "cmemory.h"
#include "unicode/ubidi.h"
#include "unicode/ustring.h"
#include "unicode/ushape.h"
#include "unicode/utf16.h"
#include "ustr_imp.h"
#include "unicode/ubiditransform.h"

/* Some convenience defines */
#define LTR …
#define RTL …
#define LOGICAL …
#define VISUAL …
#define SHAPE_LOGICAL …
#define SHAPE_VISUAL …

#define CHECK_LEN(STR, LEN, ERROR) …

#define MAX_ACTIONS …

/**
 * Typedef for a pointer to a function, which performs some operation (such as
 * reordering, setting "inverse" mode, character mirroring, etc.). Return value
 * indicates whether the text was changed in the course of this operation or
 * not.
 */
UBiDiAction;

/**
 * Structure that holds a predefined reordering scheme, including the following
 * information:
 * <ul>
 * <li>an input base direction,</li>
 * <li>an input order,</li>
 * <li>an output base direction,</li>
 * <li>an output order,</li>
 * <li>a digit shaping direction,</li>
 * <li>a letter shaping direction,</li>
 * <li>a base direction that should be applied when the reordering engine is
 *     invoked (which can not always be derived from the caller-defined
 *     options),</li>
 * <li>an array of pointers to functions that accomplish the bidi layout
 *     transformation.</li>
 * </ul>
 */
ReorderingScheme;

struct UBiDiTransform { … };

U_CAPI UBiDiTransform* U_EXPORT2
ubiditransform_open(UErrorCode *pErrorCode)
{ … }

U_CAPI void U_EXPORT2
ubiditransform_close(UBiDiTransform *pBiDiTransform)
{ … }

/**
 * Performs Bidi resolution of text.
 * 
 * @param pTransform Pointer to the <code>UBiDiTransform</code> structure.
 * @param pErrorCode Pointer to the error code value.
 *
 * @return Whether or not this function modifies the text. Besides the return
 * value, the caller should also check <code>U_SUCCESS(*pErrorCode)</code>.
 */
static UBool
action_resolve(UBiDiTransform *pTransform, UErrorCode *pErrorCode)
{ … }

/**
 * Performs basic reordering of text (Logical -> Visual LTR).
 * 
 * @param pTransform Pointer to the <code>UBiDiTransform</code> structure.
 * @param pErrorCode Pointer to the error code value.
 *
 * @return Whether or not this function modifies the text. Besides the return
 * value, the caller should also check <code>U_SUCCESS(*pErrorCode)</code>.
 */
static UBool
action_reorder(UBiDiTransform *pTransform, UErrorCode *pErrorCode)
{ … }

/**
 * Sets "inverse" mode on the <code>UBiDi</code> object.
 * 
 * @param pTransform Pointer to the <code>UBiDiTransform</code> structure.
 * @param pErrorCode Pointer to the error code value.
 *
 * @return Whether or not this function modifies the text. Besides the return
 * value, the caller should also check <code>U_SUCCESS(*pErrorCode)</code>.
 */
static UBool
action_setInverse(UBiDiTransform *pTransform, UErrorCode *pErrorCode)
{ … }

/**
 * Sets "runs only" reordering mode indicating a Logical LTR <-> Logical RTL
 * transformation.
 * 
 * @param pTransform Pointer to the <code>UBiDiTransform</code> structure.
 * @param pErrorCode Pointer to the error code value.
 *
 * @return Whether or not this function modifies the text. Besides the return
 * value, the caller should also check <code>U_SUCCESS(*pErrorCode)</code>.
 */
static UBool
action_setRunsOnly(UBiDiTransform *pTransform, UErrorCode *pErrorCode)
{ … }

/**
 * Performs string reverse.
 * 
 * @param pTransform Pointer to the <code>UBiDiTransform</code> structure.
 * @param pErrorCode Pointer to the error code value.
 *
 * @return Whether or not this function modifies the text. Besides the return
 * value, the caller should also check <code>U_SUCCESS(*pErrorCode)</code>.
 */
static UBool
action_reverse(UBiDiTransform *pTransform, UErrorCode *pErrorCode)
{ … }

/**
 * Applies a new value to the text that serves as input at the current
 * processing step. This value is identical to the original one when we begin
 * the processing, but usually changes as the transformation progresses.
 * 
 * @param pTransform A pointer to the <code>UBiDiTransform</code> structure.
 * @param newSrc A pointer whose value is to be used as input text.
 * @param newLength A length of the new text in <code>char16_t</code>s.
 * @param newSize A new source capacity in <code>char16_t</code>s.
 * @param pErrorCode Pointer to the error code value.
 */
static void
updateSrc(UBiDiTransform *pTransform, const char16_t *newSrc, uint32_t newLength,
        uint32_t newSize, UErrorCode *pErrorCode)
{ … }

/**
 * Calls a lower level shaping function.
 * 
 * @param pTransform Pointer to the <code>UBiDiTransform</code> structure.
 * @param options Shaping options.
 * @param pErrorCode Pointer to the error code value.
 */
static void
doShape(UBiDiTransform *pTransform, uint32_t options, UErrorCode *pErrorCode)
{ … }

/**
 * Performs digit and letter shaping.
 * 
 * @param pTransform Pointer to the <code>UBiDiTransform</code> structure.
 * @param pErrorCode Pointer to the error code value.
 *
 * @return Whether or not this function modifies the text. Besides the return
 * value, the caller should also check <code>U_SUCCESS(*pErrorCode)</code>.
 */
static UBool
action_shapeArabic(UBiDiTransform *pTransform, UErrorCode *pErrorCode)
{ … }

/**
 * Performs character mirroring.
 * 
 * @param pTransform Pointer to the <code>UBiDiTransform</code> structure.
 * @param pErrorCode Pointer to the error code value.
 *
 * @return Whether or not this function modifies the text. Besides the return
 * value, the caller should also check <code>U_SUCCESS(*pErrorCode)</code>.
 */
static UBool
action_mirror(UBiDiTransform *pTransform, UErrorCode *pErrorCode)
{ … }

/**
 * All possible reordering schemes.
 *
 */
static const ReorderingScheme Schemes[] = …;

static const uint32_t nSchemes = …;

/**
 * When the direction option is <code>UBIDI_DEFAULT_LTR</code> or
 * <code>UBIDI_DEFAULT_RTL</code>, resolve the base direction according to that
 * of the first strong bidi character.
 */
static void
resolveBaseDirection(const char16_t *text, uint32_t length,
        UBiDiLevel *pInLevel, UBiDiLevel *pOutLevel)
{ … }

/**
 * Finds a valid <code>ReorderingScheme</code> matching the
 * caller-defined scheme.
 * 
 * @return A valid <code>ReorderingScheme</code> object or nullptr
 */
static const ReorderingScheme*
findMatchingScheme(UBiDiLevel inLevel, UBiDiLevel outLevel,
        UBiDiOrder inOrder, UBiDiOrder outOrder)
{ … }

U_CAPI uint32_t U_EXPORT2
ubiditransform_transform(UBiDiTransform *pBiDiTransform,
            const char16_t *src, int32_t srcLength,
            char16_t *dest, int32_t destSize,
            UBiDiLevel inParaLevel, UBiDiOrder inOrder,
            UBiDiLevel outParaLevel, UBiDiOrder outOrder,
            UBiDiMirroring doMirroring, uint32_t shapingOptions,
            UErrorCode *pErrorCode)
{ … }
chromium/third_party/icu/source/common/ubiditransform.cpp
