The Tor Browser: comparison intl/icu/source/common/usc

--1:000000000000
+:b911af15dc5c
+/*
+**********************************************************************
+*   Copyright (C) 1999-2009, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+**********************************************************************
+*
+* File USC_IMPL.C
+*
+* Modification History:
+*
+*   Date        Name        Description
+*   07/08/2002  Eric Mader  Creation.
+******************************************************************************
+*/
+#include "unicode/uscript.h"
+#include "usc_impl.h"
+#include "cmemory.h"
+#define ARRAY_SIZE(array) (sizeof array  / sizeof array[0])
+#define PAREN_STACK_DEPTH 32
+#define MOD(sp) ((sp) % PAREN_STACK_DEPTH)
+#define LIMIT_INC(sp) (((sp) < PAREN_STACK_DEPTH)? (sp) + 1 : PAREN_STACK_DEPTH)
+#define INC(sp,count) (MOD((sp) + (count)))
+#define INC1(sp) (INC(sp, 1))
+#define DEC(sp,count) (MOD((sp) + PAREN_STACK_DEPTH - (count)))
+#define DEC1(sp) (DEC(sp, 1))
+#define STACK_IS_EMPTY(scriptRun) ((scriptRun)->pushCount <= 0)
+#define STACK_IS_NOT_EMPTY(scriptRun) (! STACK_IS_EMPTY(scriptRun))
+#define TOP(scriptRun) ((scriptRun)->parenStack[(scriptRun)->parenSP])
+#define SYNC_FIXUP(scriptRun) ((scriptRun)->fixupCount = 0)
+struct ParenStackEntry
+{
+int32_t pairIndex;
+UScriptCode scriptCode;
+};
+struct UScriptRun
+{
+int32_t textLength;
+const UChar *textArray;
+int32_t scriptStart;
+int32_t scriptLimit;
+UScriptCode scriptCode;
+struct ParenStackEntry parenStack[PAREN_STACK_DEPTH];
+int32_t parenSP;
+int32_t pushCount;
+int32_t fixupCount;
+};
+static int8_t highBit(int32_t value);
+static const UChar32 pairedChars[] = {
+0x0028, 0x0029, /* ascii paired punctuation */
+0x003c, 0x003e,
+0x005b, 0x005d,
+0x007b, 0x007d,
+0x00ab, 0x00bb, /* guillemets */
+0x2018, 0x2019, /* general punctuation */
+0x201c, 0x201d,
+0x2039, 0x203a,
+0x3008, 0x3009, /* chinese paired punctuation */
+0x300a, 0x300b,
+0x300c, 0x300d,
+0x300e, 0x300f,
+0x3010, 0x3011,
+0x3014, 0x3015,
+0x3016, 0x3017,
+0x3018, 0x3019,
+0x301a, 0x301b
+};
+static void push(UScriptRun *scriptRun, int32_t pairIndex, UScriptCode scriptCode)
+{
+scriptRun->pushCount  = LIMIT_INC(scriptRun->pushCount);
+scriptRun->fixupCount = LIMIT_INC(scriptRun->fixupCount);
+scriptRun->parenSP = INC1(scriptRun->parenSP);
+scriptRun->parenStack[scriptRun->parenSP].pairIndex  = pairIndex;
+scriptRun->parenStack[scriptRun->parenSP].scriptCode = scriptCode;
+}
+static void pop(UScriptRun *scriptRun)
+{
+if (STACK_IS_EMPTY(scriptRun)) {
+return;
+}
+if (scriptRun->fixupCount > 0) {
+scriptRun->fixupCount -= 1;
+}
+scriptRun->pushCount -= 1;
+scriptRun->parenSP = DEC1(scriptRun->parenSP);
+/* If the stack is now empty, reset the stack
+pointers to their initial values.
+*/
+if (STACK_IS_EMPTY(scriptRun)) {
+scriptRun->parenSP = -1;
+}
+}
+static void fixup(UScriptRun *scriptRun, UScriptCode scriptCode)
+{
+int32_t fixupSP = DEC(scriptRun->parenSP, scriptRun->fixupCount);
+while (scriptRun->fixupCount-- > 0) {
+fixupSP = INC1(fixupSP);
+scriptRun->parenStack[fixupSP].scriptCode = scriptCode;
+}
+}
+static int8_t
+highBit(int32_t value)
+{
+int8_t bit = 0;
+if (value <= 0) {
+return -32;
+}
+if (value >= 1 << 16) {
+value >>= 16;
+bit += 16;
+}
+if (value >= 1 << 8) {
+value >>= 8;
+bit += 8;
+}
+if (value >= 1 << 4) {
+value >>= 4;
+bit += 4;
+}
+if (value >= 1 << 2) {
+value >>= 2;
+bit += 2;
+}
+if (value >= 1 << 1) {
+value >>= 1;
+bit += 1;
+}
+return bit;
+}
+static int32_t
+getPairIndex(UChar32 ch)
+{
+int32_t pairedCharCount = ARRAY_SIZE(pairedChars);
+int32_t pairedCharPower = 1 << highBit(pairedCharCount);
+int32_t pairedCharExtra = pairedCharCount - pairedCharPower;
+int32_t probe = pairedCharPower;
+int32_t pairIndex = 0;
+if (ch >= pairedChars[pairedCharExtra]) {
+pairIndex = pairedCharExtra;
+}
+while (probe > (1 << 0)) {
+probe >>= 1;
+if (ch >= pairedChars[pairIndex + probe]) {
+pairIndex += probe;
+}
+}
+if (pairedChars[pairIndex] != ch) {
+pairIndex = -1;
+}
+return pairIndex;
+}
+static UBool
+sameScript(UScriptCode scriptOne, UScriptCode scriptTwo)
+{
+return scriptOne <= USCRIPT_INHERITED || scriptTwo <= USCRIPT_INHERITED || scriptOne == scriptTwo;
+}
+U_CAPI UScriptRun * U_EXPORT2
+uscript_openRun(const UChar *src, int32_t length, UErrorCode *pErrorCode)
+{
+UScriptRun *result = NULL;
+if (pErrorCode == NULL || U_FAILURE(*pErrorCode)) {
+return NULL;
+}
+result = uprv_malloc(sizeof (UScriptRun));
+if (result == NULL) {
+*pErrorCode = U_MEMORY_ALLOCATION_ERROR;
+return NULL;
+}
+uscript_setRunText(result, src, length, pErrorCode);
+/* Release the UScriptRun if uscript_setRunText() returns an error */
+if (U_FAILURE(*pErrorCode)) {
+uprv_free(result);
+result = NULL;
+}
+return result;
+}
+U_CAPI void U_EXPORT2
+uscript_closeRun(UScriptRun *scriptRun)
+{
+if (scriptRun != NULL) {
+uprv_free(scriptRun);
+}
+}
+U_CAPI void U_EXPORT2
+uscript_resetRun(UScriptRun *scriptRun)
+{
+if (scriptRun != NULL) {
+scriptRun->scriptStart = 0;
+scriptRun->scriptLimit = 0;
+scriptRun->scriptCode  = USCRIPT_INVALID_CODE;
+scriptRun->parenSP     = -1;
+scriptRun->pushCount   =  0;
+scriptRun->fixupCount  =  0;
+}
+}
+U_CAPI void U_EXPORT2
+uscript_setRunText(UScriptRun *scriptRun, const UChar *src, int32_t length, UErrorCode *pErrorCode)
+{
+if (pErrorCode == NULL || U_FAILURE(*pErrorCode)) {
+return;
+}
+if (scriptRun == NULL || length < 0 || ((src == NULL) != (length == 0))) {
+*pErrorCode = U_ILLEGAL_ARGUMENT_ERROR;
+return;
+}
+scriptRun->textArray  = src;
+scriptRun->textLength = length;
+uscript_resetRun(scriptRun);
+}
+U_CAPI UBool U_EXPORT2
+uscript_nextRun(UScriptRun *scriptRun, int32_t *pRunStart, int32_t *pRunLimit, UScriptCode *pRunScript)
+{
+UErrorCode error = U_ZERO_ERROR;
+/* if we've fallen off the end of the text, we're done */
+if (scriptRun == NULL || scriptRun->scriptLimit >= scriptRun->textLength) {
+return FALSE;
+}
+SYNC_FIXUP(scriptRun);
+scriptRun->scriptCode = USCRIPT_COMMON;
+for (scriptRun->scriptStart = scriptRun->scriptLimit; scriptRun->scriptLimit < scriptRun->textLength; scriptRun->scriptLimit += 1) {
+UChar   high = scriptRun->textArray[scriptRun->scriptLimit];
+UChar32 ch   = high;
+UScriptCode sc;
+int32_t pairIndex;
+/*
+* if the character is a high surrogate and it's not the last one
+* in the text, see if it's followed by a low surrogate
+*/
+if (high >= 0xD800 && high <= 0xDBFF && scriptRun->scriptLimit < scriptRun->textLength - 1) {
+UChar low = scriptRun->textArray[scriptRun->scriptLimit + 1];
+/*
+* if it is followed by a low surrogate,
+* consume it and form the full character
+*/
+if (low >= 0xDC00 && low <= 0xDFFF) {
+ch = (high - 0xD800) * 0x0400 + low - 0xDC00 + 0x10000;
+scriptRun->scriptLimit += 1;
+}
+}
+sc = uscript_getScript(ch, &error);
+pairIndex = getPairIndex(ch);
+/*
+* Paired character handling:
+*
+* if it's an open character, push it onto the stack.
+* if it's a close character, find the matching open on the
+* stack, and use that script code. Any non-matching open
+* characters above it on the stack will be poped.
+*/
+if (pairIndex >= 0) {
+if ((pairIndex & 1) == 0) {
+push(scriptRun, pairIndex, scriptRun->scriptCode);
+} else {
+int32_t pi = pairIndex & ~1;
+while (STACK_IS_NOT_EMPTY(scriptRun) && TOP(scriptRun).pairIndex != pi) {
+pop(scriptRun);
+}
+if (STACK_IS_NOT_EMPTY(scriptRun)) {
+sc = TOP(scriptRun).scriptCode;
+}
+}
+}
+if (sameScript(scriptRun->scriptCode, sc)) {
+if (scriptRun->scriptCode <= USCRIPT_INHERITED && sc > USCRIPT_INHERITED) {
+scriptRun->scriptCode = sc;
+fixup(scriptRun, scriptRun->scriptCode);
+}
+/*
+* if this character is a close paired character,
+* pop the matching open character from the stack
+*/
+if (pairIndex >= 0 && (pairIndex & 1) != 0) {
+pop(scriptRun);
+}
+} else {
+/*
+* if the run broke on a surrogate pair,
+* end it before the high surrogate
+*/
+if (ch >= 0x10000) {
+scriptRun->scriptLimit -= 1;
+}
+break;
+}
+}
+if (pRunStart != NULL) {
+*pRunStart = scriptRun->scriptStart;
+}
+if (pRunLimit != NULL) {
+*pRunLimit = scriptRun->scriptLimit;
+}
+if (pRunScript != NULL) {
+*pRunScript = scriptRun->scriptCode;
+}
+return TRUE;
+}

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comparison: intl/icu/source/common/usc_impl.c

intl/icu/source/common/usc_impl.c