77 lines
2.0 KiB
C++
77 lines
2.0 KiB
C++
/*
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*******************************************************************************
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*
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* Copyright (C) 1999-2001, 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: scrptrun.cpp
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*
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* created on: 10/17/2001
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* created by: Eric R. Mader
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*/
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#include "unicode/utypes.h"
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#include "unicode/uscript.h"
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#include "scrptrun.h"
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UBool ScriptRun::sameScript(int32_t scriptOne, int32_t 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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UBool ScriptRun::next()
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{
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UErrorCode error = U_ZERO_ERROR;
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if (scriptEnd >= charLimit) {
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return false;
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}
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scriptCode = USCRIPT_COMMON;
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for (scriptStart = scriptEnd; scriptEnd < charLimit; scriptEnd += 1) {
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UChar high = charArray[scriptEnd];
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UChar32 ch = high;
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if (scriptEnd < charLimit - 1 && high >= 0xD800 && high <= 0xDBFF)
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{
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UChar low = charArray[scriptEnd + 1];
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if (low >= 0xDC00 && low <= 0xDFFF) {
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ch = (high - 0xD800) * 0x0400 + low - 0xDC00 + 0x10000;
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scriptEnd += 1;
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}
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}
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UScriptCode sc = uscript_getScript(ch, &error);
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if (ch == ')' && parenSP >= 0 && parenStack[parenSP] != scriptCode) {
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sc = parenStack[parenSP--];
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break;
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} else if (sameScript(scriptCode, sc)) {
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if (scriptCode <= USCRIPT_INHERITED && sc > USCRIPT_INHERITED) {
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scriptCode = sc;
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}
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} else {
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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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if (ch >= 0x10000) {
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scriptEnd -= 1;
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}
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for (int32_t i = scriptStart; i < scriptEnd; i += 1) {
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if (charArray[i] == '(') {
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parenStack[++parenSP] = scriptCode;
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}
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}
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break;
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}
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}
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return true;
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}
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