Java Code Examples for com.ibm.icu.text.UTF16#isSurrogate()

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Example 1
Source File: Normalizer2Impl.java    From fitnotifications with Apache License 2.0 4 votes vote down vote up 
public int decompose(CharSequence s, int src, int limit,
                     ReorderingBuffer buffer) {
    int minNoCP=minDecompNoCP;

    int prevSrc;
    int c=0;
    int norm16=0;

    // only for quick check
    int prevBoundary=src;
    int prevCC=0;

    for(;;) {
        // count code units below the minimum or with irrelevant data for the quick check
        for(prevSrc=src; src!=limit;) {
            if( (c=s.charAt(src))<minNoCP ||
                isMostDecompYesAndZeroCC(norm16=normTrie.getFromU16SingleLead((char)c))
            ) {
                ++src;
            } else if(!UTF16.isSurrogate((char)c)) {
                break;
            } else {
                char c2;
                if(UTF16Plus.isSurrogateLead(c)) {
                    if((src+1)!=limit && Character.isLowSurrogate(c2=s.charAt(src+1))) {
                        c=Character.toCodePoint((char)c, c2);
                    }
                } else /* trail surrogate */ {
                    if(prevSrc<src && Character.isHighSurrogate(c2=s.charAt(src-1))) {
                        --src;
                        c=Character.toCodePoint(c2, (char)c);
                    }
                }
                if(isMostDecompYesAndZeroCC(norm16=getNorm16(c))) {
                    src+=Character.charCount(c);
                } else {
                    break;
                }
            }
        }
        // copy these code units all at once
        if(src!=prevSrc) {
            if(buffer!=null) {
                buffer.flushAndAppendZeroCC(s, prevSrc, src);
            } else {
                prevCC=0;
                prevBoundary=src;
            }
        }
        if(src==limit) {
            break;
        }

        // Check one above-minimum, relevant code point.
        src+=Character.charCount(c);
        if(buffer!=null) {
            decompose(c, norm16, buffer);
        } else {
            if(isDecompYes(norm16)) {
                int cc=getCCFromYesOrMaybe(norm16);
                if(prevCC<=cc || cc==0) {
                    prevCC=cc;
                    if(cc<=1) {
                        prevBoundary=src;
                    }
                    continue;
                }
            }
            return prevBoundary;  // "no" or cc out of order
        }
    }
    return src;
}