C++ UnicodeSet::applyPattern方法代码示例

void TransliteratorErrorTest::TestUnicodeSetErrors() {
    UnicodeString badPattern="[[:L:]-[0x0300-0x0400]";
    UnicodeSet set;
    UErrorCode status = U_ZERO_ERROR;
    UnicodeString result;

    if (!set.isEmpty()) {
        errln("FAIL: The default ctor of UnicodeSet created a non-empty object.");
    }
    set.applyPattern(badPattern, status);
    if (U_SUCCESS(status)) {
        errln("FAIL: Applied a bad pattern to the UnicodeSet object okay.");
    }
    status = U_ZERO_ERROR;
    UnicodeSet *set1 = new UnicodeSet(badPattern, status);
    if (U_SUCCESS(status)) {
        errln("FAIL: Created a UnicodeSet based on bad patterns.");
    }
    delete set1;
}

/**
 * Parse the pattern from the given RuleCharacterIterator.  The
 * iterator is advanced over the parsed pattern.
 * @param chars iterator over the pattern characters.  Upon return
 * it will be advanced to the first character after the parsed
 * pattern, or the end of the iteration if all characters are
 * parsed.
 * @param symbols symbol table to use to parse and dereference
 * variables, or null if none.
 * @param rebuiltPat the pattern that was parsed, rebuilt or
 * copied from the input pattern, as appropriate.
 * @param options a bit mask of zero or more of the following:
 * IGNORE_SPACE, CASE.
 */
void UnicodeSet::applyPattern(RuleCharacterIterator& chars,
                              const SymbolTable* symbols,
                              UnicodeString& rebuiltPat,
                              uint32_t options,
                              UnicodeSet& (UnicodeSet::*caseClosure)(int32_t attribute),
                              UErrorCode& ec) {
    if (U_FAILURE(ec)) return;

    // Syntax characters: [ ] ^ - & { }

    // Recognized special forms for chars, sets: c-c s-s s&s

    int32_t opts = RuleCharacterIterator::PARSE_VARIABLES |
                   RuleCharacterIterator::PARSE_ESCAPES;
    if ((options & USET_IGNORE_SPACE) != 0) {
        opts |= RuleCharacterIterator::SKIP_WHITESPACE;
    }

    UnicodeString patLocal, buf;
    UBool usePat = FALSE;
    UnicodeSetPointer scratch;
    RuleCharacterIterator::Pos backup;

    // mode: 0=before [, 1=between [...], 2=after ]
    // lastItem: 0=none, 1=char, 2=set
    int8_t lastItem = 0, mode = 0;
    UChar32 lastChar = 0;
    UChar op = 0;

    UBool invert = FALSE;

    clear();

    while (mode != 2 && !chars.atEnd()) {
        U_ASSERT((lastItem == 0 && op == 0) ||
                 (lastItem == 1 && (op == 0 || op == HYPHEN /*'-'*/)) ||
                 (lastItem == 2 && (op == 0 || op == HYPHEN /*'-'*/ ||
                                    op == INTERSECTION /*'&'*/)));

        UChar32 c = 0;
        UBool literal = FALSE;
        UnicodeSet* nested = 0; // alias - do not delete

        // -------- Check for property pattern

        // setMode: 0=none, 1=unicodeset, 2=propertypat, 3=preparsed
        int8_t setMode = 0;
        if (resemblesPropertyPattern(chars, opts)) {
            setMode = 2;
        }

        // -------- Parse '[' of opening delimiter OR nested set.
        // If there is a nested set, use `setMode' to define how
        // the set should be parsed.  If the '[' is part of the
        // opening delimiter for this pattern, parse special
        // strings "[", "[^", "[-", and "[^-".  Check for stand-in
        // characters representing a nested set in the symbol
        // table.

        else {
            // Prepare to backup if necessary
            chars.getPos(backup);
            c = chars.next(opts, literal, ec);
            if (U_FAILURE(ec)) return;

            if (c == 0x5B /*'['*/ && !literal) {
                if (mode == 1) {
                    chars.setPos(backup); // backup
                    setMode = 1;
                } else {
                    // Handle opening '[' delimiter
                    mode = 1;
                    patLocal.append((UChar) 0x5B /*'['*/);
                    chars.getPos(backup); // prepare to backup
                    c = chars.next(opts, literal, ec); 
                    if (U_FAILURE(ec)) return;
                    if (c == 0x5E /*'^'*/ && !literal) {
                        invert = TRUE;
                        patLocal.append((UChar) 0x5E /*'^'*/);
                        chars.getPos(backup); // prepare to backup
                        c = chars.next(opts, literal, ec);
                        if (U_FAILURE(ec)) return;
                    }
                    // Fall through to handle special leading '-';
                    // otherwise restart loop for nested [], \p{}, etc.
                    if (c == HYPHEN /*'-'*/) {
//.........这里部分代码省略.........