[apple/icu.git] / icuSources / layout / IndicRearrangementProcessor.cpp

/*
 * @(#)IndicRearrangementProcessor.cpp	1.7 00/03/15
 *
 * (C) Copyright IBM Corp. 1998-2003 - All Rights Reserved
 *
 */

#include "LETypes.h"
#include "MorphTables.h"
#include "StateTables.h"
#include "MorphStateTables.h"
#include "SubtableProcessor.h"
#include "StateTableProcessor.h"
#include "IndicRearrangementProcessor.h"
#include "LESwaps.h"

U_NAMESPACE_BEGIN

const char IndicRearrangementProcessor::fgClassID=0;

IndicRearrangementProcessor::IndicRearrangementProcessor(const MorphSubtableHeader *morphSubtableHeader)
  : StateTableProcessor(morphSubtableHeader)
{
    indicRearrangementSubtableHeader = (const IndicRearrangementSubtableHeader *) morphSubtableHeader;
    entryTable = (const IndicRearrangementStateEntry *) ((char *) &stateTableHeader->stHeader + entryTableOffset);
}

IndicRearrangementProcessor::~IndicRearrangementProcessor()
{
}

void IndicRearrangementProcessor::beginStateTable()
{
    firstGlyph = 0;
    lastGlyph = 0;
}

ByteOffset IndicRearrangementProcessor::processStateEntry(LEGlyphID *glyphs, le_int32 *charIndices, le_int32 &currGlyph,
        le_int32 /*glyphCount*/, EntryTableIndex index)
{
    const IndicRearrangementStateEntry *entry = &entryTable[index];
    ByteOffset newState = SWAPW(entry->newStateOffset);
    IndicRearrangementFlags flags = (IndicRearrangementFlags) SWAPW(entry->flags);

    if (flags & irfMarkFirst) {
        firstGlyph = currGlyph;
    }

    if (flags & irfMarkLast) {
        lastGlyph = currGlyph;
    }

    doRearrangementAction(glyphs, charIndices, (IndicRearrangementVerb) (flags & irfVerbMask));

    if (!(flags & irfDontAdvance)) {
        // XXX: Should handle reverse too...
        currGlyph += 1;
    }

    return newState;
}

void IndicRearrangementProcessor::endStateTable()
{
}

void IndicRearrangementProcessor::doRearrangementAction(LEGlyphID *glyphs, le_int32 *charIndices, IndicRearrangementVerb verb) const
{
    LEGlyphID a, b, c, d;
    le_int32 ia, ib, ic, id, x;

    switch(verb)
    {
    case irvNoAction:
        break;

    case irvxA:
        a = glyphs[firstGlyph];
        ia = charIndices[firstGlyph];
        x = firstGlyph + 1;

        while (x <= lastGlyph) {
            glyphs[x - 1] = glyphs[x];
            charIndices[x - 1] = charIndices[x];
            x += 1;
        }

        glyphs[lastGlyph] = a;
        charIndices[lastGlyph] = ia;
        break;

    case irvDx:
        d = glyphs[lastGlyph];
        id = charIndices[lastGlyph];
        x = lastGlyph - 1;

        while (x >= firstGlyph) {
            glyphs[x + 1] = glyphs[x];
            charIndices[x + 1] = charIndices[x];
            x -= 1;
        }

        glyphs[firstGlyph] = d;
        charIndices[firstGlyph] = id;
        break;

    case irvDxA:
        a = glyphs[firstGlyph];
        ia = charIndices[firstGlyph];

        glyphs[firstGlyph] = glyphs[lastGlyph];
        glyphs[lastGlyph] = a;

        charIndices[firstGlyph] = charIndices[lastGlyph];
        charIndices[lastGlyph] = ia;
        break;
        
    case irvxAB:
        a = glyphs[firstGlyph];
        b = glyphs[firstGlyph + 1];
        ia = charIndices[firstGlyph];
        ib = charIndices[firstGlyph + 1];
        x = firstGlyph + 2;

        while (x <= lastGlyph) {
            glyphs[x - 2] = glyphs[x];
            charIndices[x - 2] = charIndices[x];
            x += 1;
        }

        glyphs[lastGlyph - 1] = a;
        glyphs[lastGlyph] = b;

        charIndices[lastGlyph - 1] = ia;
        charIndices[lastGlyph] = ib;
        break;

    case irvxBA:
        a = glyphs[firstGlyph];
        b = glyphs[firstGlyph + 1];
        ia = charIndices[firstGlyph];
        ib = charIndices[firstGlyph + 1];
        x = firstGlyph + 2;

        while (x <= lastGlyph) {
            glyphs[x - 2] = glyphs[x];
            charIndices[x - 2] = charIndices[x];
            x += 1;
        }

        glyphs[lastGlyph - 1] = b;
        glyphs[lastGlyph] = a;

        charIndices[lastGlyph - 1] = ib;
        charIndices[lastGlyph] = ia;
        break;

    case irvCDx:
        c = glyphs[lastGlyph - 1];
        d = glyphs[lastGlyph];
        ic = charIndices[lastGlyph - 1];
        id = charIndices[lastGlyph];
        x = lastGlyph - 2;

        while (x >= lastGlyph) {
            glyphs[x + 2] = glyphs[x];
            charIndices[x + 2] = charIndices[x];
            x -= 1;
        }
        
        glyphs[firstGlyph] = c;
        glyphs[firstGlyph + 1] = d;

        charIndices[firstGlyph] = ic;
        charIndices[firstGlyph + 1] = id;
        break; 

    case irvDCx:
        c = glyphs[lastGlyph - 1];
        d = glyphs[lastGlyph];
        ic = charIndices[lastGlyph - 1];
        id = charIndices[lastGlyph];
        x = lastGlyph - 2;

        while (x >= lastGlyph) {
            glyphs[x + 2] = glyphs[x];
            charIndices[x + 2] = charIndices[x];
            x -= 1;
        }
        
        glyphs[firstGlyph] = d;
        glyphs[firstGlyph + 1] = c;

        charIndices[firstGlyph] = id;
        charIndices[firstGlyph + 1] = ic;
        break; 

    case irvCDxA:
        a = glyphs[firstGlyph];
        c = glyphs[lastGlyph - 1];
        d = glyphs[lastGlyph];
        ia = charIndices[firstGlyph];
        ic = charIndices[lastGlyph - 1];
        id = charIndices[lastGlyph];
        x = lastGlyph - 2;

        while (x > firstGlyph) {
            glyphs[x + 1] = glyphs[x];
            charIndices[x + 1] = charIndices[x];
            x -= 1;
        }
        
        glyphs[firstGlyph] = c;
        glyphs[firstGlyph + 1] = d;
        glyphs[lastGlyph] = a;

        charIndices[firstGlyph] = ic;
        charIndices[firstGlyph + 1] = id;
        charIndices[lastGlyph] = ia;
        break; 

    case irvDCxA:
        a = glyphs[firstGlyph];
        c = glyphs[lastGlyph - 1];
        d = glyphs[lastGlyph];
        ia = charIndices[firstGlyph];
        ic = charIndices[lastGlyph - 1];
        id = charIndices[lastGlyph];
        x = lastGlyph - 2;

        while (x > firstGlyph) {
            glyphs[x + 1] = glyphs[x];
            charIndices[x + 1] = charIndices[x];
            x -= 1;
        }
        
        glyphs[firstGlyph] = d;
        glyphs[firstGlyph + 1] = c;
        glyphs[lastGlyph] = a;

        charIndices[firstGlyph] = id;
        charIndices[firstGlyph + 1] = ic;
        charIndices[lastGlyph] = ia;
        break; 

    case irvDxAB:
        a = glyphs[firstGlyph];
        b = glyphs[firstGlyph + 1];
        d = glyphs[lastGlyph];
        ia = charIndices[firstGlyph];
        ib = charIndices[firstGlyph + 1];
        id = charIndices[lastGlyph];
        x = firstGlyph + 2;

        while (x < lastGlyph) {
            glyphs[x - 2] = glyphs[x];
            charIndices[x - 2] = charIndices[x];
            x += 1;
        }

        glyphs[firstGlyph] = d;
        glyphs[lastGlyph - 1] = a;
        glyphs[lastGlyph] = b;

        charIndices[firstGlyph] = id;
        charIndices[lastGlyph - 1] = ia;
        charIndices[lastGlyph] = ib;
        break;

    case irvDxBA:
        a = glyphs[firstGlyph];
        b = glyphs[firstGlyph + 1];
        d = glyphs[lastGlyph];
        ia = charIndices[firstGlyph];
        ib = charIndices[firstGlyph + 1];
        id = charIndices[lastGlyph];
        x = firstGlyph + 2;

        while (x < lastGlyph) {
            glyphs[x - 2] = glyphs[x];
            charIndices[x - 2] = charIndices[x];
            x += 1;
        }

        glyphs[firstGlyph] = d;
        glyphs[lastGlyph - 1] = b;
        glyphs[lastGlyph] = a;

        charIndices[firstGlyph] = id;
        charIndices[lastGlyph - 1] = ib;
        charIndices[lastGlyph] = ia;
        break;

    case irvCDxAB:
        a = glyphs[firstGlyph];
        b = glyphs[firstGlyph + 1];

        glyphs[firstGlyph] = glyphs[lastGlyph - 1];
        glyphs[firstGlyph + 1] = glyphs[lastGlyph];

        glyphs[lastGlyph - 1] = a;
        glyphs[lastGlyph] = b;

        ia = charIndices[firstGlyph];
        ib = charIndices[firstGlyph + 1];

        charIndices[firstGlyph] = charIndices[lastGlyph - 1];
        charIndices[firstGlyph + 1] = charIndices[lastGlyph];

        charIndices[lastGlyph - 1] = ia;
        charIndices[lastGlyph] = ib;
        break;

    case irvCDxBA:
        a = glyphs[firstGlyph];
        b = glyphs[firstGlyph + 1];

        glyphs[firstGlyph] = glyphs[lastGlyph - 1];
        glyphs[firstGlyph + 1] = glyphs[lastGlyph];

        glyphs[lastGlyph - 1] = b;
        glyphs[lastGlyph] = a;

        ia = charIndices[firstGlyph];
        ib = charIndices[firstGlyph + 1];

        charIndices[firstGlyph] = charIndices[lastGlyph - 1];
        charIndices[firstGlyph + 1] = charIndices[lastGlyph];

        charIndices[lastGlyph - 1] = ib;
        charIndices[lastGlyph] = ia;
        break;

    case irvDCxAB:
        a = glyphs[firstGlyph];
        b = glyphs[firstGlyph + 1];

        glyphs[firstGlyph] = glyphs[lastGlyph];
        glyphs[firstGlyph + 1] = glyphs[lastGlyph - 1];

        glyphs[lastGlyph - 1] = a;
        glyphs[lastGlyph] = b;

        ia = charIndices[firstGlyph];
        ib = charIndices[firstGlyph + 1];

        charIndices[firstGlyph] = charIndices[lastGlyph];
        charIndices[firstGlyph + 1] = charIndices[lastGlyph - 1];

        charIndices[lastGlyph - 1] = ia;
        charIndices[lastGlyph] = ib;
        break;

    case irvDCxBA:
        a = glyphs[firstGlyph];
        b = glyphs[firstGlyph + 1];

        glyphs[firstGlyph] = glyphs[lastGlyph];
        glyphs[firstGlyph + 1] = glyphs[lastGlyph - 1];

        glyphs[lastGlyph - 1] = b;
        glyphs[lastGlyph] = a;

        ia = charIndices[firstGlyph];
        ib = charIndices[firstGlyph + 1];

        charIndices[firstGlyph] = charIndices[lastGlyph];
        charIndices[firstGlyph + 1] = charIndices[lastGlyph - 1];

        charIndices[lastGlyph - 1] = ib;
        charIndices[lastGlyph] = ia;
        break;
    
    default:
        break;
    }
}

U_NAMESPACE_END
Commit	Line	Data
b75a7d8f A	1	/*
	2	* @(#)IndicRearrangementProcessor.cpp 1.7 00/03/15
	3	*
	4	* (C) Copyright IBM Corp. 1998-2003 - All Rights Reserved
	5	*
	6	*/
	7
	8	#include "LETypes.h"
	9	#include "MorphTables.h"
	10	#include "StateTables.h"
	11	#include "MorphStateTables.h"
	12	#include "SubtableProcessor.h"
	13	#include "StateTableProcessor.h"
	14	#include "IndicRearrangementProcessor.h"
	15	#include "LESwaps.h"
	16
	17	U_NAMESPACE_BEGIN
	18
	19	const char IndicRearrangementProcessor::fgClassID=0;
	20
	21	IndicRearrangementProcessor::IndicRearrangementProcessor(const MorphSubtableHeader *morphSubtableHeader)
	22	: StateTableProcessor(morphSubtableHeader)
	23	{
	24	indicRearrangementSubtableHeader = (const IndicRearrangementSubtableHeader *) morphSubtableHeader;
	25	entryTable = (const IndicRearrangementStateEntry ) ((char ) &stateTableHeader->stHeader + entryTableOffset);
	26	}
	27
	28	IndicRearrangementProcessor::~IndicRearrangementProcessor()
	29	{
	30	}
	31
	32	void IndicRearrangementProcessor::beginStateTable()
	33	{
	34	firstGlyph = 0;
	35	lastGlyph = 0;
	36	}
	37
	38	ByteOffset IndicRearrangementProcessor::processStateEntry(LEGlyphID glyphs, le_int32 charIndices, le_int32 &currGlyph,
	39	le_int32 /glyphCount/, EntryTableIndex index)
	40	{
	41	const IndicRearrangementStateEntry *entry = &entryTable[index];
	42	ByteOffset newState = SWAPW(entry->newStateOffset);
	43	IndicRearrangementFlags flags = (IndicRearrangementFlags) SWAPW(entry->flags);
	44
	45	if (flags & irfMarkFirst) {
	46	firstGlyph = currGlyph;
	47	}
	48
	49	if (flags & irfMarkLast) {
	50	lastGlyph = currGlyph;
	51	}
	52
	53	doRearrangementAction(glyphs, charIndices, (IndicRearrangementVerb) (flags & irfVerbMask));
	54
	55	if (!(flags & irfDontAdvance)) {
	56	// XXX: Should handle reverse too...
	57	currGlyph += 1;
	58	}
	59
	60	return newState;
	61	}
	62
	63	void IndicRearrangementProcessor::endStateTable()
	64	{
65	}
66
67	void IndicRearrangementProcessor::doRearrangementAction(LEGlyphID glyphs, le_int32 charIndices, IndicRearrangementVerb verb) const
68	{
69	LEGlyphID a, b, c, d;
70	le_int32 ia, ib, ic, id, x;
71
72	switch(verb)
73	{
74	case irvNoAction:
75	break;
76
77	case irvxA:
78	a = glyphs[firstGlyph];
79	ia = charIndices[firstGlyph];
80	x = firstGlyph + 1;
81
82	while (x <= lastGlyph) {
83	glyphs[x - 1] = glyphs[x];
84	charIndices[x - 1] = charIndices[x];
85	x += 1;
86	}
87
88	glyphs[lastGlyph] = a;
89	charIndices[lastGlyph] = ia;
90	break;
91
92	case irvDx:
93	d = glyphs[lastGlyph];
94	id = charIndices[lastGlyph];
95	x = lastGlyph - 1;
96
97	while (x >= firstGlyph) {
98	glyphs[x + 1] = glyphs[x];
99	charIndices[x + 1] = charIndices[x];
100	x -= 1;
101	}
102
103	glyphs[firstGlyph] = d;
104	charIndices[firstGlyph] = id;
105	break;
106
107	case irvDxA:
108	a = glyphs[firstGlyph];
109	ia = charIndices[firstGlyph];
110
111	glyphs[firstGlyph] = glyphs[lastGlyph];
112	glyphs[lastGlyph] = a;
113
114	charIndices[firstGlyph] = charIndices[lastGlyph];
115	charIndices[lastGlyph] = ia;
116	break;
117
118	case irvxAB:
119	a = glyphs[firstGlyph];
120	b = glyphs[firstGlyph + 1];
121	ia = charIndices[firstGlyph];
122	ib = charIndices[firstGlyph + 1];
123	x = firstGlyph + 2;
124
125	while (x <= lastGlyph) {
126	glyphs[x - 2] = glyphs[x];
127	charIndices[x - 2] = charIndices[x];
128	x += 1;
129	}
130
131	glyphs[lastGlyph - 1] = a;
132	glyphs[lastGlyph] = b;
133
134	charIndices[lastGlyph - 1] = ia;
135	charIndices[lastGlyph] = ib;
136	break;
137
138	case irvxBA:
139	a = glyphs[firstGlyph];
140	b = glyphs[firstGlyph + 1];
141	ia = charIndices[firstGlyph];
142	ib = charIndices[firstGlyph + 1];
143	x = firstGlyph + 2;
144
145	while (x <= lastGlyph) {
146	glyphs[x - 2] = glyphs[x];
147	charIndices[x - 2] = charIndices[x];
148	x += 1;
149	}
150
151	glyphs[lastGlyph - 1] = b;
152	glyphs[lastGlyph] = a;
153
154	charIndices[lastGlyph - 1] = ib;
155	charIndices[lastGlyph] = ia;
156	break;
157
158	case irvCDx:
159	c = glyphs[lastGlyph - 1];
160	d = glyphs[lastGlyph];
161	ic = charIndices[lastGlyph - 1];
162	id = charIndices[lastGlyph];
163	x = lastGlyph - 2;
164
165	while (x >= lastGlyph) {
166	glyphs[x + 2] = glyphs[x];
167	charIndices[x + 2] = charIndices[x];
168	x -= 1;
169	}
170
171	glyphs[firstGlyph] = c;
172	glyphs[firstGlyph + 1] = d;
173
174	charIndices[firstGlyph] = ic;
175	charIndices[firstGlyph + 1] = id;
176	break;
177
178	case irvDCx:
179	c = glyphs[lastGlyph - 1];
180	d = glyphs[lastGlyph];
181	ic = charIndices[lastGlyph - 1];
182	id = charIndices[lastGlyph];
183	x = lastGlyph - 2;
184
185	while (x >= lastGlyph) {
186	glyphs[x + 2] = glyphs[x];
187	charIndices[x + 2] = charIndices[x];
188	x -= 1;
189	}
190
191	glyphs[firstGlyph] = d;
192	glyphs[firstGlyph + 1] = c;
193
194	charIndices[firstGlyph] = id;
195	charIndices[firstGlyph + 1] = ic;
196	break;
197
198	case irvCDxA:
199	a = glyphs[firstGlyph];
200	c = glyphs[lastGlyph - 1];
201	d = glyphs[lastGlyph];
202	ia = charIndices[firstGlyph];
203	ic = charIndices[lastGlyph - 1];
204	id = charIndices[lastGlyph];
205	x = lastGlyph - 2;
206
207	while (x > firstGlyph) {
208	glyphs[x + 1] = glyphs[x];
209	charIndices[x + 1] = charIndices[x];
210	x -= 1;
211	}
212
213	glyphs[firstGlyph] = c;
214	glyphs[firstGlyph + 1] = d;
215	glyphs[lastGlyph] = a;
216
217	charIndices[firstGlyph] = ic;
218	charIndices[firstGlyph + 1] = id;
219	charIndices[lastGlyph] = ia;
220	break;
221
222	case irvDCxA:
223	a = glyphs[firstGlyph];
224	c = glyphs[lastGlyph - 1];
225	d = glyphs[lastGlyph];
226	ia = charIndices[firstGlyph];
227	ic = charIndices[lastGlyph - 1];
228	id = charIndices[lastGlyph];
229	x = lastGlyph - 2;
230
231	while (x > firstGlyph) {
232	glyphs[x + 1] = glyphs[x];
233	charIndices[x + 1] = charIndices[x];
234	x -= 1;
235	}
236
237	glyphs[firstGlyph] = d;
238	glyphs[firstGlyph + 1] = c;
239	glyphs[lastGlyph] = a;
240
241	charIndices[firstGlyph] = id;
242	charIndices[firstGlyph + 1] = ic;
243	charIndices[lastGlyph] = ia;
244	break;
245
246	case irvDxAB:
247	a = glyphs[firstGlyph];
248	b = glyphs[firstGlyph + 1];
249	d = glyphs[lastGlyph];
250	ia = charIndices[firstGlyph];
251	ib = charIndices[firstGlyph + 1];
252	id = charIndices[lastGlyph];
253	x = firstGlyph + 2;
254
255	while (x < lastGlyph) {
256	glyphs[x - 2] = glyphs[x];
257	charIndices[x - 2] = charIndices[x];
258	x += 1;
259	}
260
261	glyphs[firstGlyph] = d;
262	glyphs[lastGlyph - 1] = a;
263	glyphs[lastGlyph] = b;
264
265	charIndices[firstGlyph] = id;
266	charIndices[lastGlyph - 1] = ia;
267	charIndices[lastGlyph] = ib;
268	break;
269
270	case irvDxBA:
271	a = glyphs[firstGlyph];
272	b = glyphs[firstGlyph + 1];
273	d = glyphs[lastGlyph];
274	ia = charIndices[firstGlyph];
275	ib = charIndices[firstGlyph + 1];
276	id = charIndices[lastGlyph];
277	x = firstGlyph + 2;
278
279	while (x < lastGlyph) {
280	glyphs[x - 2] = glyphs[x];
281	charIndices[x - 2] = charIndices[x];
282	x += 1;
283	}
284
285	glyphs[firstGlyph] = d;
286	glyphs[lastGlyph - 1] = b;
287	glyphs[lastGlyph] = a;
288
289	charIndices[firstGlyph] = id;
290	charIndices[lastGlyph - 1] = ib;
291	charIndices[lastGlyph] = ia;
292	break;
293
294	case irvCDxAB:
295	a = glyphs[firstGlyph];
296	b = glyphs[firstGlyph + 1];
297
298	glyphs[firstGlyph] = glyphs[lastGlyph - 1];
299	glyphs[firstGlyph + 1] = glyphs[lastGlyph];
300
301	glyphs[lastGlyph - 1] = a;
302	glyphs[lastGlyph] = b;
303
304	ia = charIndices[firstGlyph];
305	ib = charIndices[firstGlyph + 1];
306
307	charIndices[firstGlyph] = charIndices[lastGlyph - 1];
308	charIndices[firstGlyph + 1] = charIndices[lastGlyph];
309
310	charIndices[lastGlyph - 1] = ia;
311	charIndices[lastGlyph] = ib;
312	break;
313
314	case irvCDxBA:
315	a = glyphs[firstGlyph];
316	b = glyphs[firstGlyph + 1];
317
318	glyphs[firstGlyph] = glyphs[lastGlyph - 1];
319	glyphs[firstGlyph + 1] = glyphs[lastGlyph];
320
321	glyphs[lastGlyph - 1] = b;
322	glyphs[lastGlyph] = a;
323
324	ia = charIndices[firstGlyph];
325	ib = charIndices[firstGlyph + 1];
326
327	charIndices[firstGlyph] = charIndices[lastGlyph - 1];
328	charIndices[firstGlyph + 1] = charIndices[lastGlyph];
329
330	charIndices[lastGlyph - 1] = ib;
331	charIndices[lastGlyph] = ia;
332	break;
333
334	case irvDCxAB:
335	a = glyphs[firstGlyph];
336	b = glyphs[firstGlyph + 1];
337
338	glyphs[firstGlyph] = glyphs[lastGlyph];
339	glyphs[firstGlyph + 1] = glyphs[lastGlyph - 1];
340
341	glyphs[lastGlyph - 1] = a;
342	glyphs[lastGlyph] = b;
343
344	ia = charIndices[firstGlyph];
345	ib = charIndices[firstGlyph + 1];
346
347	charIndices[firstGlyph] = charIndices[lastGlyph];
348	charIndices[firstGlyph + 1] = charIndices[lastGlyph - 1];
349
350	charIndices[lastGlyph - 1] = ia;
351	charIndices[lastGlyph] = ib;
352	break;
353
354	case irvDCxBA:
355	a = glyphs[firstGlyph];
356	b = glyphs[firstGlyph + 1];
357
358	glyphs[firstGlyph] = glyphs[lastGlyph];
359	glyphs[firstGlyph + 1] = glyphs[lastGlyph - 1];
360
361	glyphs[lastGlyph - 1] = b;
362	glyphs[lastGlyph] = a;
363
364	ia = charIndices[firstGlyph];
365	ib = charIndices[firstGlyph + 1];
366
367	charIndices[firstGlyph] = charIndices[lastGlyph];
368	charIndices[firstGlyph + 1] = charIndices[lastGlyph - 1];
369
370	charIndices[lastGlyph - 1] = ib;
371	charIndices[lastGlyph] = ia;
372	break;
373
374	default:
375	break;
376	}
377	}
378
379	U_NAMESPACE_END