bidiline.java

iText是一个能够快速产生PDF文件的java类库。iText的java类对于那些要产生包含文本

            indexChunk = 0;
        }
        storedRunDirection = runDirection;
        storedTotalTextLength = totalTextLength;
        storedIndexChunk = indexChunk;
        storedIndexChunkChar = indexChunkChar;
        storedCurrentChar = currentChar;
        shortStore = (currentChar < totalTextLength);
        if (!shortStore) {
            // long save
            if (storedText.length < totalTextLength) {
                storedText = new char[totalTextLength];
                storedDetailChunks = new PdfChunk[totalTextLength];
            }
            System.arraycopy(text, 0, storedText, 0, totalTextLength);
            System.arraycopy(detailChunks, 0, storedDetailChunks, 0, totalTextLength);
        }
        if (runDirection == PdfWriter.RUN_DIRECTION_LTR || runDirection == PdfWriter.RUN_DIRECTION_RTL) {
            if (storedOrderLevels.length < totalTextLength) {
                storedOrderLevels = new byte[totalTextLength];
                storedIndexChars = new int[totalTextLength];
            }
            System.arraycopy(orderLevels, currentChar, storedOrderLevels, currentChar, totalTextLength - currentChar);
            System.arraycopy(indexChars, currentChar, storedIndexChars, currentChar, totalTextLength - currentChar);
        }
    }
    
    public void restore() {
        runDirection = storedRunDirection;
        totalTextLength = storedTotalTextLength;
        indexChunk = storedIndexChunk;
        indexChunkChar = storedIndexChunkChar;
        currentChar = storedCurrentChar;
        if (!shortStore) {
            // long restore
            System.arraycopy(storedText, 0, text, 0, totalTextLength);
            System.arraycopy(storedDetailChunks, 0, detailChunks, 0, totalTextLength);
        }
        if (runDirection == PdfWriter.RUN_DIRECTION_LTR || runDirection == PdfWriter.RUN_DIRECTION_RTL) {
            System.arraycopy(storedOrderLevels, currentChar, orderLevels, currentChar, totalTextLength - currentChar);
            System.arraycopy(storedIndexChars, currentChar, indexChars, currentChar, totalTextLength - currentChar);
        }
    }
    
    public void mirrorGlyphs() {
        for (int k = 0; k < totalTextLength; ++k) {
            if ((orderLevels[k] & 1) == 1) {
                int mirror = mirrorChars.get(text[k]);
                if (mirror != 0)
                    text[k] = (char)mirror;
            }
        }
    }
    
    public void doArabicShapping() {
        int src = 0;
        int dest = 0;
        for (;;) {
            while (src < totalTextLength) {
                char c = text[src];
                if (c >= 0x0600 && c <= 0x06ff)
                    break;
                if (src != dest) {
                    text[dest] = text[src];
                    detailChunks[dest] = detailChunks[src];
                    orderLevels[dest] = orderLevels[src];
                }
                ++src;
                ++dest;
            }
            if (src >= totalTextLength) {
                totalTextLength = dest;
                return;
            }
            int startArabicIdx = src;
            ++src;
            while (src < totalTextLength) {
                char c = text[src];
                if (c < 0x0600 || c > 0x06ff)
                    break;
                ++src;
            }
            int arabicWordSize = src - startArabicIdx;
            int size = ArabicLigaturizer.arabic_shape(text, startArabicIdx, arabicWordSize, text, dest, arabicWordSize, arabicOptions /*PangoArabicShapping.ar_novowel PangoArabicShapping.ar_lig | PangoArabicShapping.ar_composedtashkeel*/);
            if (startArabicIdx != dest) {
                for (int k = 0; k < size; ++k) {
                    detailChunks[dest] = detailChunks[startArabicIdx];
                    orderLevels[dest++] = orderLevels[startArabicIdx++];
                }
            }
            else
                dest += size;
        }
    }
       
    public PdfLine processLine(float width, int alignment, int runDirection, int arabicOptions) {
        this.arabicOptions = arabicOptions;
        save();
        boolean isRTL = (runDirection == PdfWriter.RUN_DIRECTION_RTL);
        if (currentChar >= totalTextLength) {
            boolean hasText = getParagraph(runDirection);
            if (!hasText)
                return null;
            if (totalTextLength == 0) {
                ArrayList ar = new ArrayList();
                PdfChunk ck = new PdfChunk("", detailChunks[0]);
                ar.add(ck);
                return new PdfLine(0, 0, alignment, true, ar, isRTL);
            }
        }
        float originalWidth = width;
        int lastSplit = -1;
        if (currentChar != 0)
            currentChar = trimLeftEx(currentChar, totalTextLength - 1);
        int oldCurrentChar = currentChar;
        char c = 0;
        char uniC = 0;
        PdfChunk ck = null;
        float charWidth = 0;
        PdfChunk lastValidChunk = null;
        for (; currentChar < totalTextLength; ++currentChar) {
            c = text[currentChar];
            ck = detailChunks[currentChar];
            uniC = ck.getUnicodeEquivalent(c);
            if (PdfChunk.noPrint(uniC))
                continue;
            charWidth = ck.getCharWidth(c);
            if (ck.isExtSplitCharacter(oldCurrentChar, currentChar, totalTextLength, text, detailChunks))
                lastSplit = currentChar;
            if (width - charWidth < 0)
                break;
            width -= charWidth;
            lastValidChunk = ck;
        }
        if (lastValidChunk == null) {
            // not even a single char fit; must output the first char
            ++currentChar;
            return new PdfLine(0, 0, alignment, false, createArrayOfPdfChunks(currentChar - 1, currentChar - 1), isRTL);
        }
        if (currentChar >= totalTextLength) {
            // there was more line than text
            return new PdfLine(0, width, alignment, true, createArrayOfPdfChunks(oldCurrentChar, totalTextLength - 1), isRTL);
        }
        int newCurrentChar = trimRightEx(oldCurrentChar, currentChar - 1);
        if (newCurrentChar < oldCurrentChar) {
            // only WS
            return new PdfLine(0, width, alignment, false, createArrayOfPdfChunks(oldCurrentChar, currentChar - 1), isRTL);
        }
        if (newCurrentChar == currentChar - 1) { // middle of word
            HyphenationEvent he = (HyphenationEvent)lastValidChunk.getAttribute(Chunk.HYPHENATION);
            if (he != null) {
                int word[] = getWord(oldCurrentChar, newCurrentChar);
                if (word != null) {
                    float testWidth = width + getWidth(word[0], currentChar - 1);
                    String pre = he.getHyphenatedWordPre(new String(text, word[0], word[1] - word[0]), lastValidChunk.font().getFont(), lastValidChunk.font().size(), testWidth);
                    String post = he.getHyphenatedWordPost();
                    if (pre.length() > 0) {
                        PdfChunk extra = new PdfChunk(pre, lastValidChunk);
                        currentChar = word[1] - post.length();
                        return new PdfLine(0, testWidth - lastValidChunk.font().width(pre), alignment, false, createArrayOfPdfChunks(oldCurrentChar, word[0] - 1, extra), isRTL);
                    }
                }
            }
        }
        if (lastSplit == -1 || lastSplit >= newCurrentChar) {
            // no split point or split point ahead of end
            return new PdfLine(0, width + getWidth(newCurrentChar + 1, currentChar - 1), alignment, false, createArrayOfPdfChunks(oldCurrentChar, newCurrentChar), isRTL);
        }
        // standard split
        currentChar = lastSplit + 1;
        newCurrentChar = trimRightEx(oldCurrentChar, lastSplit);
        if (newCurrentChar < oldCurrentChar) {
            // only WS again
            newCurrentChar = currentChar - 1;
        }
        return new PdfLine(0, originalWidth - getWidth(oldCurrentChar, newCurrentChar), alignment, false, createArrayOfPdfChunks(oldCurrentChar, newCurrentChar), isRTL);
    }
    
    /** Gets the width of a range of characters.
     * @param startIdx the first index to calculate
     * @param lastIdx the last inclusive index to calculate
     * @return the sum of all widths
     */    
    public float getWidth(int startIdx, int lastIdx) {
        char c = 0;
        char uniC;
        PdfChunk ck = null;
        float width = 0;
        for (; startIdx <= lastIdx; ++startIdx) {
            c = text[startIdx];
            ck = detailChunks[startIdx];
            uniC = ck.getUnicodeEquivalent(c);
            if (PdfChunk.noPrint(uniC))
                continue;
            width += detailChunks[startIdx].getCharWidth(c);
        }
        return width;
    }
    
    public ArrayList createArrayOfPdfChunks(int startIdx, int endIdx) {
        return createArrayOfPdfChunks(startIdx, endIdx, null);
    }
    
    public ArrayList createArrayOfPdfChunks(int startIdx, int endIdx, PdfChunk extraPdfChunk) {
        boolean bidi = (runDirection == PdfWriter.RUN_DIRECTION_LTR || runDirection == PdfWriter.RUN_DIRECTION_RTL);
        if (bidi)
            reorder(startIdx, endIdx);
        ArrayList ar = new ArrayList();
        PdfChunk refCk = detailChunks[startIdx];
        PdfChunk ck = null;
        StringBuffer buf = new StringBuffer();
        char c;
        int idx = 0;
        for (; startIdx <= endIdx; ++startIdx) {
            idx = bidi ? indexChars[startIdx] : startIdx;
            c = text[idx];
            ck = detailChunks[idx];
            if (PdfChunk.noPrint(ck.getUnicodeEquivalent(c)))
                continue;
            if (ck.isImage()) {
                if (buf.length() > 0) {
                    ar.add(new PdfChunk(buf.toString(), refCk));
                    buf = new StringBuffer();
                }
                ar.add(ck);
            }
            else if (ck == refCk) {
                buf.append(c);
            }