362 lines
9.3 KiB
C++
362 lines
9.3 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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**********************************************************************
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* Copyright (C) 1999-2016, 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 USC_IMPL.C
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*
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* Modification History:
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*
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* Date Name Description
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* 07/08/2002 Eric Mader Creation.
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******************************************************************************
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*/
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#include "unicode/uscript.h"
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#include "usc_impl.h"
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#include "cmemory.h"
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#define PAREN_STACK_DEPTH 32
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#define MOD(sp) ((sp) % PAREN_STACK_DEPTH)
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#define LIMIT_INC(sp) (((sp) < PAREN_STACK_DEPTH)? (sp) + 1 : PAREN_STACK_DEPTH)
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#define INC(sp,count) (MOD((sp) + (count)))
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#define INC1(sp) (INC(sp, 1))
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#define DEC(sp,count) (MOD((sp) + PAREN_STACK_DEPTH - (count)))
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#define DEC1(sp) (DEC(sp, 1))
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#define STACK_IS_EMPTY(scriptRun) ((scriptRun)->pushCount <= 0)
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#define STACK_IS_NOT_EMPTY(scriptRun) (! STACK_IS_EMPTY(scriptRun))
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#define TOP(scriptRun) ((scriptRun)->parenStack[(scriptRun)->parenSP])
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#define SYNC_FIXUP(scriptRun) ((scriptRun)->fixupCount = 0)
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struct ParenStackEntry
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{
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int32_t pairIndex;
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UScriptCode scriptCode;
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};
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struct UScriptRun
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{
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int32_t textLength;
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const UChar *textArray;
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int32_t scriptStart;
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int32_t scriptLimit;
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UScriptCode scriptCode;
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struct ParenStackEntry parenStack[PAREN_STACK_DEPTH];
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int32_t parenSP;
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int32_t pushCount;
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int32_t fixupCount;
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};
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static int8_t highBit(int32_t value);
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static const UChar32 pairedChars[] = {
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0x0028, 0x0029, /* ascii paired punctuation */
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0x003c, 0x003e,
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0x005b, 0x005d,
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0x007b, 0x007d,
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0x00ab, 0x00bb, /* guillemets */
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0x2018, 0x2019, /* general punctuation */
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0x201c, 0x201d,
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0x2039, 0x203a,
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0x3008, 0x3009, /* chinese paired punctuation */
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0x300a, 0x300b,
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0x300c, 0x300d,
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0x300e, 0x300f,
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0x3010, 0x3011,
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0x3014, 0x3015,
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0x3016, 0x3017,
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0x3018, 0x3019,
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0x301a, 0x301b
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};
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static void push(UScriptRun *scriptRun, int32_t pairIndex, UScriptCode scriptCode)
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{
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scriptRun->pushCount = LIMIT_INC(scriptRun->pushCount);
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scriptRun->fixupCount = LIMIT_INC(scriptRun->fixupCount);
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scriptRun->parenSP = INC1(scriptRun->parenSP);
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scriptRun->parenStack[scriptRun->parenSP].pairIndex = pairIndex;
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scriptRun->parenStack[scriptRun->parenSP].scriptCode = scriptCode;
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}
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static void pop(UScriptRun *scriptRun)
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{
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if (STACK_IS_EMPTY(scriptRun)) {
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return;
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}
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if (scriptRun->fixupCount > 0) {
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scriptRun->fixupCount -= 1;
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}
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scriptRun->pushCount -= 1;
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scriptRun->parenSP = DEC1(scriptRun->parenSP);
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/* If the stack is now empty, reset the stack
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pointers to their initial values.
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*/
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if (STACK_IS_EMPTY(scriptRun)) {
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scriptRun->parenSP = -1;
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}
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}
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static void fixup(UScriptRun *scriptRun, UScriptCode scriptCode)
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{
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int32_t fixupSP = DEC(scriptRun->parenSP, scriptRun->fixupCount);
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while (scriptRun->fixupCount-- > 0) {
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fixupSP = INC1(fixupSP);
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scriptRun->parenStack[fixupSP].scriptCode = scriptCode;
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}
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}
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static int8_t
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highBit(int32_t value)
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{
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int8_t bit = 0;
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if (value <= 0) {
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return -32;
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}
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if (value >= 1 << 16) {
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value >>= 16;
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bit += 16;
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}
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if (value >= 1 << 8) {
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value >>= 8;
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bit += 8;
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}
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if (value >= 1 << 4) {
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value >>= 4;
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bit += 4;
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}
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if (value >= 1 << 2) {
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value >>= 2;
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bit += 2;
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}
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if (value >= 1 << 1) {
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//value >>= 1;
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bit += 1;
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}
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return bit;
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}
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static int32_t
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getPairIndex(UChar32 ch)
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{
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int32_t pairedCharCount = UPRV_LENGTHOF(pairedChars);
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int32_t pairedCharPower = 1 << highBit(pairedCharCount);
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int32_t pairedCharExtra = pairedCharCount - pairedCharPower;
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int32_t probe = pairedCharPower;
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int32_t pairIndex = 0;
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if (ch >= pairedChars[pairedCharExtra]) {
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pairIndex = pairedCharExtra;
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}
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while (probe > (1 << 0)) {
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probe >>= 1;
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if (ch >= pairedChars[pairIndex + probe]) {
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pairIndex += probe;
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}
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}
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if (pairedChars[pairIndex] != ch) {
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pairIndex = -1;
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}
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return pairIndex;
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}
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static UBool
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sameScript(UScriptCode scriptOne, UScriptCode scriptTwo)
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{
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return scriptOne <= USCRIPT_INHERITED || scriptTwo <= USCRIPT_INHERITED || scriptOne == scriptTwo;
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}
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U_CAPI UScriptRun * U_EXPORT2
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uscript_openRun(const UChar *src, int32_t length, UErrorCode *pErrorCode)
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{
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UScriptRun *result = NULL;
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if (pErrorCode == NULL || U_FAILURE(*pErrorCode)) {
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return NULL;
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}
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result = (UScriptRun *)uprv_malloc(sizeof (UScriptRun));
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if (result == NULL) {
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*pErrorCode = U_MEMORY_ALLOCATION_ERROR;
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return NULL;
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}
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uscript_setRunText(result, src, length, pErrorCode);
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/* Release the UScriptRun if uscript_setRunText() returns an error */
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if (U_FAILURE(*pErrorCode)) {
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uprv_free(result);
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result = NULL;
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}
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return result;
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}
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U_CAPI void U_EXPORT2
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uscript_closeRun(UScriptRun *scriptRun)
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{
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if (scriptRun != NULL) {
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uprv_free(scriptRun);
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}
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}
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U_CAPI void U_EXPORT2
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uscript_resetRun(UScriptRun *scriptRun)
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{
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if (scriptRun != NULL) {
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scriptRun->scriptStart = 0;
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scriptRun->scriptLimit = 0;
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scriptRun->scriptCode = USCRIPT_INVALID_CODE;
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scriptRun->parenSP = -1;
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scriptRun->pushCount = 0;
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scriptRun->fixupCount = 0;
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}
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}
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U_CAPI void U_EXPORT2
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uscript_setRunText(UScriptRun *scriptRun, const UChar *src, int32_t length, UErrorCode *pErrorCode)
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{
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if (pErrorCode == NULL || U_FAILURE(*pErrorCode)) {
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return;
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}
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if (scriptRun == NULL || length < 0 || ((src == NULL) != (length == 0))) {
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*pErrorCode = U_ILLEGAL_ARGUMENT_ERROR;
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return;
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}
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scriptRun->textArray = src;
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scriptRun->textLength = length;
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uscript_resetRun(scriptRun);
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}
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U_CAPI UBool U_EXPORT2
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uscript_nextRun(UScriptRun *scriptRun, int32_t *pRunStart, int32_t *pRunLimit, UScriptCode *pRunScript)
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{
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UErrorCode error = U_ZERO_ERROR;
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/* if we've fallen off the end of the text, we're done */
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if (scriptRun == NULL || scriptRun->scriptLimit >= scriptRun->textLength) {
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return false;
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}
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SYNC_FIXUP(scriptRun);
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scriptRun->scriptCode = USCRIPT_COMMON;
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for (scriptRun->scriptStart = scriptRun->scriptLimit; scriptRun->scriptLimit < scriptRun->textLength; scriptRun->scriptLimit += 1) {
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UChar high = scriptRun->textArray[scriptRun->scriptLimit];
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UChar32 ch = high;
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UScriptCode sc;
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int32_t pairIndex;
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/*
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* if the character is a high surrogate and it's not the last one
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* in the text, see if it's followed by a low surrogate
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*/
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if (high >= 0xD800 && high <= 0xDBFF && scriptRun->scriptLimit < scriptRun->textLength - 1) {
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UChar low = scriptRun->textArray[scriptRun->scriptLimit + 1];
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/*
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* if it is followed by a low surrogate,
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* consume it and form the full character
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*/
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if (low >= 0xDC00 && low <= 0xDFFF) {
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ch = (high - 0xD800) * 0x0400 + low - 0xDC00 + 0x10000;
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scriptRun->scriptLimit += 1;
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}
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}
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sc = uscript_getScript(ch, &error);
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pairIndex = getPairIndex(ch);
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/*
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* Paired character handling:
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*
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* if it's an open character, push it onto the stack.
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* if it's a close character, find the matching open on the
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* stack, and use that script code. Any non-matching open
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* characters above it on the stack will be poped.
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*/
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if (pairIndex >= 0) {
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if ((pairIndex & 1) == 0) {
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push(scriptRun, pairIndex, scriptRun->scriptCode);
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} else {
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int32_t pi = pairIndex & ~1;
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while (STACK_IS_NOT_EMPTY(scriptRun) && TOP(scriptRun).pairIndex != pi) {
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pop(scriptRun);
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}
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if (STACK_IS_NOT_EMPTY(scriptRun)) {
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sc = TOP(scriptRun).scriptCode;
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}
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}
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}
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if (sameScript(scriptRun->scriptCode, sc)) {
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if (scriptRun->scriptCode <= USCRIPT_INHERITED && sc > USCRIPT_INHERITED) {
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scriptRun->scriptCode = sc;
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fixup(scriptRun, scriptRun->scriptCode);
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}
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/*
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* if this character is a close paired character,
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* pop the matching open character from the stack
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*/
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if (pairIndex >= 0 && (pairIndex & 1) != 0) {
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pop(scriptRun);
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}
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} else {
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/*
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* if the run broke on a surrogate pair,
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* end it before the high surrogate
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*/
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if (ch >= 0x10000) {
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scriptRun->scriptLimit -= 1;
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}
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break;
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}
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}
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if (pRunStart != NULL) {
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*pRunStart = scriptRun->scriptStart;
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}
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if (pRunLimit != NULL) {
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*pRunLimit = scriptRun->scriptLimit;
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}
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if (pRunScript != NULL) {
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*pRunScript = scriptRun->scriptCode;
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}
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return true;
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}
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