Beispiel #1
0
U_CDECL_END

U_CAPI void U_EXPORT2
ucm_optimizeStates(UCMStates *states,
                   uint16_t **pUnicodeCodeUnits,
                   _MBCSToUFallback *toUFallbacks, int32_t countToUFallbacks,
                   UBool verbose) {
    UErrorCode errorCode;
    int32_t state, cell, entry;

    /* test each state table entry */
    for(state=0; state<states->countStates; ++state) {
        for(cell=0; cell<256; ++cell) {
            entry=states->stateTable[state][cell];
            /*
             * if the entry is a final one with an MBCS_STATE_VALID_DIRECT_16 action code
             * and the code point is "unassigned" (0xfffe), then change it to
             * the "unassigned" action code with bits 26..23 set to zero and U+fffe.
             */
            if(MBCS_ENTRY_SET_STATE(entry, 0)==MBCS_ENTRY_FINAL(0, MBCS_STATE_VALID_DIRECT_16, 0xfffe)) {
                states->stateTable[state][cell]=MBCS_ENTRY_FINAL_SET_ACTION(entry, MBCS_STATE_UNASSIGNED);
            }
        }
    }

    /* try to compact the toUnicode tables */
    if(states->maxCharLength==2) {
        compactToUnicode2(states, pUnicodeCodeUnits, toUFallbacks, countToUFallbacks, verbose);
    } else if(states->maxCharLength>2) {
        if(verbose) {
            compactToUnicodeHelper(states, *pUnicodeCodeUnits, toUFallbacks, countToUFallbacks);
        }
    }

    /* sort toUFallbacks */
    /*
     * It should be safe to sort them before compactToUnicode2() is called,
     * because it should not change the relative order of the offset values
     * that it adjusts, but they need to be sorted at some point, and
     * it is safest here.
     */
    if(countToUFallbacks>0) {
        errorCode=U_ZERO_ERROR; /* nothing bad will happen... */
        uprv_sortArray(toUFallbacks, countToUFallbacks,
                       sizeof(_MBCSToUFallback),
                       compareFallbacks, NULL, FALSE, &errorCode);
    }
}
/*
 * state table row grammar (ebnf-style):
 * (whitespace is allowed between all tokens)
 *
 * row=[[firstentry ','] entry (',' entry)*]
 * firstentry="initial" | "surrogates"
 *            (initial state (default for state 0), output is all surrogate pairs)
 * entry=range [':' nextstate] ['.' action]
 * range=number ['-' number]
 * nextstate=number
 *           (0..7f)
 * action='u' | 's' | 'p' | 'i'
 *        (unassigned, state change only, surrogate pair, illegal)
 * number=(1- or 2-digit hexadecimal number)
 */
static const char *
parseState(const char *s, int32_t state[256], uint32_t *pFlags) {
    const char *t;
    uint32_t start, end, i;
    int32_t entry;

    /* initialize the state: all illegal with U+ffff */
    for(i=0; i<256; ++i) {
        state[i]=MBCS_ENTRY_FINAL(0, MBCS_STATE_ILLEGAL, 0xffff);
    }

    /* skip leading white space */
    s=u_skipWhitespace(s);

    /* is there an "initial" or "surrogates" directive? */
    if(uprv_strncmp("initial", s, 7)==0) {
        *pFlags=MBCS_STATE_FLAG_DIRECT;
        s=u_skipWhitespace(s+7);
        if(*s++!=',') {
            return s-1;
        }
    } else if(*pFlags==0 && uprv_strncmp("surrogates", s, 10)==0) {
        *pFlags=MBCS_STATE_FLAG_SURROGATES;
        s=u_skipWhitespace(s+10);
        if(*s++!=',') {
            return s-1;
        }
    } else if(*s==0) {
        /* empty state row: all-illegal */
        return NULL;
    }

    for(;;) {
        /* read an entry, the start of the range first */
        s=u_skipWhitespace(s);
        start=uprv_strtoul(s, (char **)&t, 16);
        if(s==t || 0xff<start) {
            return s;
        }
        s=u_skipWhitespace(t);

        /* read the end of the range if there is one */
        if(*s=='-') {
            s=u_skipWhitespace(s+1);
            end=uprv_strtoul(s, (char **)&t, 16);
            if(s==t || end<start || 0xff<end) {
                return s;
            }
            s=u_skipWhitespace(t);
        } else {
            end=start;
        }

        /* determine the state entrys for this range */
        if(*s!=':' && *s!='.') {
            /* the default is: final state with valid entries */
            entry=MBCS_ENTRY_FINAL(0, MBCS_STATE_VALID_16, 0);
        } else {
            entry=MBCS_ENTRY_TRANSITION(0, 0);
            if(*s==':') {
                /* get the next state, default to 0 */
                s=u_skipWhitespace(s+1);
                i=uprv_strtoul(s, (char **)&t, 16);
                if(s!=t) {
                    if(0x7f<i) {
                        return s;
                    }
                    s=u_skipWhitespace(t);
                    entry=MBCS_ENTRY_SET_STATE(entry, i);
                }
            }

            /* get the state action, default to valid */
            if(*s=='.') {
                /* this is a final state */
                entry=MBCS_ENTRY_SET_FINAL(entry);

                s=u_skipWhitespace(s+1);
                if(*s=='u') {
                    /* unassigned set U+fffe */
                    entry=MBCS_ENTRY_FINAL_SET_ACTION_VALUE(entry, MBCS_STATE_UNASSIGNED, 0xfffe);
                    s=u_skipWhitespace(s+1);
                } else if(*s=='p') {
                    if(*pFlags!=MBCS_STATE_FLAG_DIRECT) {
                        entry=MBCS_ENTRY_FINAL_SET_ACTION(entry, MBCS_STATE_VALID_16_PAIR);
                    } else {
                        entry=MBCS_ENTRY_FINAL_SET_ACTION(entry, MBCS_STATE_VALID_16);
                    }
                    s=u_skipWhitespace(s+1);
                } else if(*s=='s') {
                    entry=MBCS_ENTRY_FINAL_SET_ACTION(entry, MBCS_STATE_CHANGE_ONLY);
                    s=u_skipWhitespace(s+1);
                } else if(*s=='i') {
                    /* illegal set U+ffff */
                    entry=MBCS_ENTRY_FINAL_SET_ACTION_VALUE(entry, MBCS_STATE_ILLEGAL, 0xffff);
                    s=u_skipWhitespace(s+1);
                } else {
                    /* default to valid */
                    entry=MBCS_ENTRY_FINAL_SET_ACTION(entry, MBCS_STATE_VALID_16);
                }
            } else {
                /* this is an intermediate state, nothing to do */
            }
        }

        /* adjust "final valid" states according to the state flags */
        if(MBCS_ENTRY_FINAL_ACTION(entry)==MBCS_STATE_VALID_16) {
            switch(*pFlags) {
            case 0:
                /* no adjustment */
                break;
            case MBCS_STATE_FLAG_DIRECT:
                /* set the valid-direct code point to "unassigned"==0xfffe */
                entry=MBCS_ENTRY_FINAL_SET_ACTION_VALUE(entry, MBCS_STATE_VALID_DIRECT_16, 0xfffe);
                break;
            case MBCS_STATE_FLAG_SURROGATES:
                entry=MBCS_ENTRY_FINAL_SET_ACTION_VALUE(entry, MBCS_STATE_VALID_16_PAIR, 0);
                break;
            default:
                break;
            }
        }

        /* set this entry for the range */
        for(i=start; i<=end; ++i) {
            state[i]=entry;
        }

        if(*s==',') {
            ++s;
        } else {
            return *s==0 ? NULL : s;
        }
    }
}