Examples of com.ibm.icu.text.ArabicShaping

com.ibm.icu.text.ArabicShaping
Shape Arabic text on a character basis.
ArabicShaping performs basic operations for "shaping" Arabic text. It is most useful for use with legacy data formats and legacy display technology (simple terminals). All operations are performed on Unicode characters.

Text-based shaping means that some character code points in the text are replaced by others depending on the context. It transforms one kind of text into another. In comparison, modern displays for Arabic text select appropriate, context-dependent font glyphs for each text element, which means that they transform text into a glyph vector.

Text transformations are necessary when modern display technology is not available or when text needs to be transformed to or from legacy formats that use "shaped" characters. Since the Arabic script is cursive, connecting adjacent letters to each other, computers select images for each letter based on the surrounding letters. This usually results in four images per Arabic letter: initial, middle, final, and isolated forms. In Unicode, on the other hand, letters are normally stored abstract, and a display system is expected to select the necessary glyphs. (This makes searching and other text processing easier because the same letter has only one code.) It is possible to mimic this with text transformations because there are characters in Unicode that are rendered as letters with a specific shape (or cursive connectivity). They were included for interoperability with legacy systems and codepages, and for unsophisticated display systems.

A second kind of text transformations is supported for Arabic digits: For compatibility with legacy codepages that only include European digits, it is possible to replace one set of digits by another, changing the character code points. These operations can be performed for either Arabic-Indic Digits (U+0660...U+0669) or Eastern (Extended) Arabic-Indic digits (U+06f0...U+06f9).

Some replacements may result in more or fewer characters (code points). By default, this means that the destination buffer may receive text with a length different from the source length. Some legacy systems rely on the length of the text to be constant. They expect extra spaces to be added or consumed either next to the affected character or at the end of the text.
@stable ICU 2.0

        if (dl < 0) {
            dl = 2 * sl;
            System.out.println("dl defaulting to " + dl);
        }


        ArabicShaping shaper = new ArabicShaping(options);
        System.out.println("shaper: " + shaper);


        char[] src = text.toCharArray();
        System.out.println(" input: '" + escapedText(src, ss, sl) + "'");
        if (testtype != STRING) {
            System.out.println("start: " + ss + " length: " + sl + " total length: " + src.length);
        }


        int result = -1;
        char[] dest = null;


        try {
            switch (testtype) {
            case COPY:
                dest = new char[ds + dl];
                result = shaper.shape(src, ss, sl, dest, ds, dl);
                break;


            case INPLACE:
                shaper.shape(src, ss, sl);
                ds = ss;
                result = sl;
                dest = src;
                break;


            case STRING:
                dest = shaper.shape(text).toCharArray();
                ds = 0;
                result = dest.length;
                break;
            }

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        for (int i = 0; i < standardTests.length; ++i) {
            TestData test = standardTests[i];


            Exception ex = null;
            String result = null;
            ArabicShaping shaper = null;


            try {
                shaper = new ArabicShaping(test.flags);
                result = shaper.shape(test.source);
            }
            catch(MissingResourceException e){
                throw e;
            }
            catch (IllegalStateException ie){

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            TestData test = preflightTests[i];


            Exception ex = null;
            char src[] = null;
            int len = 0;
            ArabicShaping shaper = null;


            if (test.source != null) {
                src = test.source.toCharArray();
            }


            try {
                shaper = new ArabicShaping(test.flags);
                len = shaper.shape(src, 0, src.length, null, 0, 0);
            }
            catch (Exception e) {
                ex = e;
            }

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            TestData test = errorTests[i];


            Exception ex = null;
            char src[] = null;
            int len = 0;
            ArabicShaping shaper = null;


            if (test.source != null) {
                src = test.source.toCharArray();
                len = src.length;
            }


            try {
                shaper = new ArabicShaping(test.flags);
                shaper.shape(src, 0, len);
            }
            catch (Exception e) {
                ex = e;
            }

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        }
    }


    public void testEquals()
    {
        ArabicShaping as1 = new ArabicShaping(LETTERS_SHAPE | TEXT_DIRECTION_VISUAL_LTR | LENGTH_FIXED_SPACES_NEAR);
        ArabicShaping as2 = new ArabicShaping(LETTERS_SHAPE | TEXT_DIRECTION_VISUAL_LTR | LENGTH_FIXED_SPACES_NEAR);
        ArabicShaping as3 = new ArabicShaping(LETTERS_UNSHAPE | TEXT_DIRECTION_LOGICAL | LENGTH_FIXED_SPACES_AT_BEGINNING);


        if (! as1.equals(as1)) {
            err("as1: " + as1 + " does not equal itself!\n");
        }

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    private String bidiReorder(String p_147647_1_)
    {
        try
        {
            Bidi bidi = new Bidi((new ArabicShaping(8)).shape(p_147647_1_), 127);
            bidi.setReorderingMode(0);
            return bidi.writeReordered(2);
        }
        catch (ArabicShapingException arabicshapingexception)
        {

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