Check in the pristine copy of ICU 4.6...

icu46/source/common/ubidi_props.c

+/*
+*******************************************************************************
+*
+*   Copyright (C) 2004-2010, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+*
+*******************************************************************************
+*   file name:  ubidi_props.c
+*   encoding:   US-ASCII
+*   tab size:   8 (not used)
+*   indentation:4
+*
+*   created on: 2004dec30
+*   created by: Markus W. Scherer
+*
+*   Low-level Unicode bidi/shaping properties access.
+*/
+
+#include "unicode/utypes.h"
+#include "unicode/uset.h"
+#include "unicode/udata.h" /* UDataInfo */
+#include "ucmndata.h" /* DataHeader */
+#include "udatamem.h"
+#include "umutex.h"
+#include "uassert.h"
+#include "cmemory.h"
+#include "utrie2.h"
+#include "ubidi_props.h"
+#include "ucln_cmn.h"
+
+struct UBiDiProps {
+    UDataMemory *mem;
+    const int32_t *indexes;
+    const uint32_t *mirrors;
+    const uint8_t *jgArray;
+
+    UTrie2 trie;
+    uint8_t formatVersion[4];
+};
+
+/* ubidi_props_data.c is machine-generated by genbidi --csource */
+#include "ubidi_props_data.c"
+
+/* UBiDiProps singleton ----------------------------------------------------- */
+
+U_CFUNC const UBiDiProps *
+ubidi_getSingleton() {
+    return &ubidi_props_singleton;
+}
+
+/* set of property starts for UnicodeSet ------------------------------------ */
+
+static UBool U_CALLCONV
+_enumPropertyStartsRange(const void *context, UChar32 start, UChar32 end, uint32_t value) {
+    /* add the start code point to the USet */
+    const USetAdder *sa=(const USetAdder *)context;
+    sa->add(sa->set, start);
+    return TRUE;
+}
+
+U_CFUNC void
+ubidi_addPropertyStarts(const UBiDiProps *bdp, const USetAdder *sa, UErrorCode *pErrorCode) {
+    int32_t i, length;
+    UChar32 c, start, limit;
+
+    const uint8_t *jgArray;
+    uint8_t prev, jg;
+
+    if(U_FAILURE(*pErrorCode)) {
+        return;
+    }
+
+    /* add the start code point of each same-value range of the trie */
+    utrie2_enum(&bdp->trie, NULL, _enumPropertyStartsRange, sa);
+
+    /* add the code points from the bidi mirroring table */
+    length=bdp->indexes[UBIDI_IX_MIRROR_LENGTH];
+    for(i=0; i<length; ++i) {
+        c=UBIDI_GET_MIRROR_CODE_POINT(bdp->mirrors[i]);
+        sa->addRange(sa->set, c, c+1);
+    }
+
+    /* add the code points from the Joining_Group array where the value changes */
+    start=bdp->indexes[UBIDI_IX_JG_START];
+    limit=bdp->indexes[UBIDI_IX_JG_LIMIT];
+    jgArray=bdp->jgArray;
+    prev=0;
+    while(start<limit) {
+        jg=*jgArray++;
+        if(jg!=prev) {
+            sa->add(sa->set, start);
+            prev=jg;
+        }
+        ++start;
+    }
+    if(prev!=0) {
+        /* add the limit code point if the last value was not 0 (it is now start==limit) */
+        sa->add(sa->set, limit);
+    }
+
+    /* add code points with hardcoded properties, plus the ones following them */
+
+    /* (none right now) */
+}
+
+/* property access functions ------------------------------------------------ */
+
+U_CFUNC int32_t
+ubidi_getMaxValue(const UBiDiProps *bdp, UProperty which) {
+    int32_t max;
+
+    if(bdp==NULL) {
+        return -1;
+    }
+
+    max=bdp->indexes[UBIDI_MAX_VALUES_INDEX];
+    switch(which) {
+    case UCHAR_BIDI_CLASS:
+        return (max&UBIDI_CLASS_MASK);
+    case UCHAR_JOINING_GROUP:
+        return (max&UBIDI_MAX_JG_MASK)>>UBIDI_MAX_JG_SHIFT;
+    case UCHAR_JOINING_TYPE:
+        return (max&UBIDI_JT_MASK)>>UBIDI_JT_SHIFT;
+    default:
+        return -1; /* undefined */
+    }
+}
+
+U_CAPI UCharDirection
+ubidi_getClass(const UBiDiProps *bdp, UChar32 c) {
+    uint16_t props=UTRIE2_GET16(&bdp->trie, c);
+    return (UCharDirection)UBIDI_GET_CLASS(props);
+}
+
+U_CFUNC UBool
+ubidi_isMirrored(const UBiDiProps *bdp, UChar32 c) {
+    uint16_t props=UTRIE2_GET16(&bdp->trie, c);
+    return (UBool)UBIDI_GET_FLAG(props, UBIDI_IS_MIRRORED_SHIFT);
+}
+
+U_CFUNC UChar32
+ubidi_getMirror(const UBiDiProps *bdp, UChar32 c) {
+    uint16_t props=UTRIE2_GET16(&bdp->trie, c);
+    int32_t delta=((int16_t)props)>>UBIDI_MIRROR_DELTA_SHIFT;
+    if(delta!=UBIDI_ESC_MIRROR_DELTA) {
+        return c+delta;
+    } else {
+        /* look for mirror code point in the mirrors[] table */
+        const uint32_t *mirrors;
+        uint32_t m;
+        int32_t i, length;
+        UChar32 c2;
+
+        mirrors=bdp->mirrors;
+        length=bdp->indexes[UBIDI_IX_MIRROR_LENGTH];
+
+        /* linear search */
+        for(i=0; i<length; ++i) {
+            m=mirrors[i];
+            c2=UBIDI_GET_MIRROR_CODE_POINT(m);
+            if(c==c2) {
+                /* found c, return its mirror code point using the index in m */
+                return UBIDI_GET_MIRROR_CODE_POINT(mirrors[UBIDI_GET_MIRROR_INDEX(m)]);
+            } else if(c<c2) {
+                break;
+            }
+        }
+
+        /* c not found, return it itself */
+        return c;
+    }
+}
+
+U_CFUNC UBool
+ubidi_isBidiControl(const UBiDiProps *bdp, UChar32 c) {
+    uint16_t props=UTRIE2_GET16(&bdp->trie, c);
+    return (UBool)UBIDI_GET_FLAG(props, UBIDI_BIDI_CONTROL_SHIFT);
+}
+
+U_CFUNC UBool
+ubidi_isJoinControl(const UBiDiProps *bdp, UChar32 c) {
+    uint16_t props=UTRIE2_GET16(&bdp->trie, c);
+    return (UBool)UBIDI_GET_FLAG(props, UBIDI_JOIN_CONTROL_SHIFT);
+}
+
+U_CFUNC UJoiningType
+ubidi_getJoiningType(const UBiDiProps *bdp, UChar32 c) {
+    uint16_t props=UTRIE2_GET16(&bdp->trie, c);
+    return (UJoiningType)((props&UBIDI_JT_MASK)>>UBIDI_JT_SHIFT);
+}
+
+U_CFUNC UJoiningGroup
+ubidi_getJoiningGroup(const UBiDiProps *bdp, UChar32 c) {
+    UChar32 start, limit;
+
+    start=bdp->indexes[UBIDI_IX_JG_START];
+    limit=bdp->indexes[UBIDI_IX_JG_LIMIT];
+    if(start<=c && c<limit) {
+        return (UJoiningGroup)bdp->jgArray[c-start];
+    } else {
+        return U_JG_NO_JOINING_GROUP;
+    }
+}
+
+/* public API (see uchar.h) ------------------------------------------------- */
+
+U_CFUNC UCharDirection
+u_charDirection(UChar32 c) {   
+    return ubidi_getClass(&ubidi_props_singleton, c);
+}
+
+U_CFUNC UBool
+u_isMirrored(UChar32 c) {
+    return ubidi_isMirrored(&ubidi_props_singleton, c);
+}
+
+U_CFUNC UChar32
+u_charMirror(UChar32 c) {
+    return ubidi_getMirror(&ubidi_props_singleton, c);
+}