Add m-esr52 at 52.6.0

1 files changed, 531 insertions, 0 deletions

diff --git a/intl/icu/source/i18n/utf8collationiterator.cpp b/intl/icu/source/i18n/utf8collationiterator.cpp
new file mode 100644
index 000000000..0a0205e7b
--- /dev/null
+++ b/intl/icu/source/i18n/utf8collationiterator.cpp
@@ -0,0 +1,531 @@
+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+* Copyright (C) 2012-2014, International Business Machines
+* Corporation and others.  All Rights Reserved.
+*******************************************************************************
+* utf8collationiterator.cpp
+*
+* created on: 2012nov12 (from utf16collationiterator.cpp & uitercollationiterator.cpp)
+* created by: Markus W. Scherer
+*/
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_COLLATION
+
+#include "unicode/utf8.h"
+#include "charstr.h"
+#include "cmemory.h"
+#include "collation.h"
+#include "collationdata.h"
+#include "collationfcd.h"
+#include "collationiterator.h"
+#include "normalizer2impl.h"
+#include "uassert.h"
+#include "utf8collationiterator.h"
+
+U_NAMESPACE_BEGIN
+
+UTF8CollationIterator::~UTF8CollationIterator() {}
+
+void
+UTF8CollationIterator::resetToOffset(int32_t newOffset) {
+    reset();
+    pos = newOffset;
+}
+
+int32_t
+UTF8CollationIterator::getOffset() const {
+    return pos;
+}
+
+uint32_t
+UTF8CollationIterator::handleNextCE32(UChar32 &c, UErrorCode & /*errorCode*/) {
+    if(pos == length) {
+        c = U_SENTINEL;
+        return Collation::FALLBACK_CE32;
+    }
+    // Optimized combination of U8_NEXT_OR_FFFD() and UTRIE2_U8_NEXT32().
+    c = u8[pos++];
+    if(c < 0xc0) {
+        // ASCII 00..7F; trail bytes 80..BF map to error values.
+        return trie->data32[c];
+    }
+    uint8_t t1, t2;
+    if(c < 0xe0 && pos != length && (t1 = (u8[pos] - 0x80)) <= 0x3f) {
+        // U+0080..U+07FF; 00..7F map to error values.
+        uint32_t ce32 = trie->data32[trie->index[(UTRIE2_UTF8_2B_INDEX_2_OFFSET - 0xc0) + c] + t1];
+        c = ((c & 0x1f) << 6) | t1;
+        ++pos;
+        return ce32;
+    } else if(c <= 0xef &&
+              ((pos + 1) < length || length < 0) &&
+              (t1 = (u8[pos] - 0x80)) <= 0x3f && (c != 0xe0 || t1 >= 0x20) &&
+              (t2 = (u8[pos + 1] - 0x80)) <= 0x3f
+    ) {
+        // U+0800..U+FFFF; caller maps surrogates to error values.
+        c = (UChar)((c << 12) | (t1 << 6) | t2);
+        pos += 2;
+        return UTRIE2_GET32_FROM_U16_SINGLE_LEAD(trie, c);
+    } else {
+        // Function call for supplementary code points and error cases.
+        // Illegal byte sequences yield U+FFFD.
+        c = utf8_nextCharSafeBody(u8, &pos, length, c, -3);
+        return data->getCE32(c);
+    }
+}
+
+UBool
+UTF8CollationIterator::foundNULTerminator() {
+    if(length < 0) {
+        length = --pos;
+        return TRUE;
+    } else {
+        return FALSE;
+    }
+}
+
+UBool
+UTF8CollationIterator::forbidSurrogateCodePoints() const {
+    return TRUE;
+}
+
+UChar32
+UTF8CollationIterator::nextCodePoint(UErrorCode & /*errorCode*/) {
+    if(pos == length) {
+        return U_SENTINEL;
+    }
+    if(u8[pos] == 0 && length < 0) {
+        length = pos;
+        return U_SENTINEL;
+    }
+    UChar32 c;
+    U8_NEXT_OR_FFFD(u8, pos, length, c);
+    return c;
+}
+
+UChar32
+UTF8CollationIterator::previousCodePoint(UErrorCode & /*errorCode*/) {
+    if(pos == 0) {
+        return U_SENTINEL;
+    }
+    UChar32 c;
+    U8_PREV_OR_FFFD(u8, 0, pos, c);
+    return c;
+}
+
+void
+UTF8CollationIterator::forwardNumCodePoints(int32_t num, UErrorCode & /*errorCode*/) {
+    U8_FWD_N(u8, pos, length, num);
+}
+
+void
+UTF8CollationIterator::backwardNumCodePoints(int32_t num, UErrorCode & /*errorCode*/) {
+    U8_BACK_N(u8, 0, pos, num);
+}
+
+// FCDUTF8CollationIterator ------------------------------------------------ ***
+
+FCDUTF8CollationIterator::~FCDUTF8CollationIterator() {}
+
+void
+FCDUTF8CollationIterator::resetToOffset(int32_t newOffset) {
+    reset();
+    start = pos = newOffset;
+    state = CHECK_FWD;
+}
+
+int32_t
+FCDUTF8CollationIterator::getOffset() const {
+    if(state != IN_NORMALIZED) {
+        return pos;
+    } else if(pos == 0) {
+        return start;
+    } else {
+        return limit;
+    }
+}
+
+uint32_t
+FCDUTF8CollationIterator::handleNextCE32(UChar32 &c, UErrorCode &errorCode) {
+    for(;;) {
+        if(state == CHECK_FWD) {
+            // Combination of UTF8CollationIterator::handleNextCE32() with FCD check fastpath.
+            if(pos == length) {
+                c = U_SENTINEL;
+                return Collation::FALLBACK_CE32;
+            }
+            c = u8[pos++];
+            if(c < 0xc0) {
+                // ASCII 00..7F; trail bytes 80..BF map to error values.
+                return trie->data32[c];
+            }
+            uint8_t t1, t2;
+            if(c < 0xe0 && pos != length && (t1 = (u8[pos] - 0x80)) <= 0x3f) {
+                // U+0080..U+07FF; 00..7F map to error values.
+                uint32_t ce32 = trie->data32[trie->index[(UTRIE2_UTF8_2B_INDEX_2_OFFSET - 0xc0) + c] + t1];
+                c = ((c & 0x1f) << 6) | t1;
+                ++pos;
+                if(CollationFCD::hasTccc(c) && pos != length && nextHasLccc()) {
+                    pos -= 2;
+                } else {
+                    return ce32;
+                }
+            } else if(c <= 0xef &&
+                      ((pos + 1) < length || length < 0) &&
+                      (t1 = (u8[pos] - 0x80)) <= 0x3f && (c != 0xe0 || t1 >= 0x20) &&
+                      (t2 = (u8[pos + 1] - 0x80)) <= 0x3f
+            ) {
+                // U+0800..U+FFFF; caller maps surrogates to error values.
+                c = (UChar)((c << 12) | (t1 << 6) | t2);
+                pos += 2;
+                if(CollationFCD::hasTccc(c) &&
+                        (CollationFCD::maybeTibetanCompositeVowel(c) ||
+                            (pos != length && nextHasLccc()))) {
+                    pos -= 3;
+                } else {
+                    break;  // return CE32(BMP)
+                }
+            } else {
+                // Function call for supplementary code points and error cases.
+                // Illegal byte sequences yield U+FFFD.
+                c = utf8_nextCharSafeBody(u8, &pos, length, c, -3);
+                if(c == 0xfffd) {
+                    return Collation::FFFD_CE32;
+                } else {
+                    U_ASSERT(c > 0xffff);
+                    if(CollationFCD::hasTccc(U16_LEAD(c)) && pos != length && nextHasLccc()) {
+                        pos -= 4;
+                    } else {
+                        return data->getCE32FromSupplementary(c);
+                    }
+                }
+            }
+            if(!nextSegment(errorCode)) {
+                c = U_SENTINEL;
+                return Collation::FALLBACK_CE32;
+            }
+            continue;
+        } else if(state == IN_FCD_SEGMENT && pos != limit) {
+            return UTF8CollationIterator::handleNextCE32(c, errorCode);
+        } else if(state == IN_NORMALIZED && pos != normalized.length()) {
+            c = normalized[pos++];
+            break;
+        } else {
+            switchToForward();
+        }
+    }
+    return UTRIE2_GET32_FROM_U16_SINGLE_LEAD(trie, c);
+}
+
+UBool
+FCDUTF8CollationIterator::nextHasLccc() const {
+    U_ASSERT(state == CHECK_FWD && pos != length);
+    // The lowest code point with ccc!=0 is U+0300 which is CC 80 in UTF-8.
+    // CJK U+4000..U+DFFF except U+Axxx are also FCD-inert. (Lead bytes E4..ED except EA.)
+    UChar32 c = u8[pos];
+    if(c < 0xcc || (0xe4 <= c && c <= 0xed && c != 0xea)) { return FALSE; }
+    int32_t i = pos;
+    U8_NEXT_OR_FFFD(u8, i, length, c);
+    if(c > 0xffff) { c = U16_LEAD(c); }
+    return CollationFCD::hasLccc(c);
+}
+
+UBool
+FCDUTF8CollationIterator::previousHasTccc() const {
+    U_ASSERT(state == CHECK_BWD && pos != 0);
+    UChar32 c = u8[pos - 1];
+    if(c < 0x80) { return FALSE; }
+    int32_t i = pos;
+    U8_PREV_OR_FFFD(u8, 0, i, c);
+    if(c > 0xffff) { c = U16_LEAD(c); }
+    return CollationFCD::hasTccc(c);
+}
+
+UChar
+FCDUTF8CollationIterator::handleGetTrailSurrogate() {
+    if(state != IN_NORMALIZED) { return 0; }
+    U_ASSERT(pos < normalized.length());
+    UChar trail;
+    if(U16_IS_TRAIL(trail = normalized[pos])) { ++pos; }
+    return trail;
+}
+
+UBool
+FCDUTF8CollationIterator::foundNULTerminator() {
+    if(state == CHECK_FWD && length < 0) {
+        length = --pos;
+        return TRUE;
+    } else {
+        return FALSE;
+    }
+}
+
+UChar32
+FCDUTF8CollationIterator::nextCodePoint(UErrorCode &errorCode) {
+    UChar32 c;
+    for(;;) {
+        if(state == CHECK_FWD) {
+            if(pos == length || ((c = u8[pos]) == 0 && length < 0)) {
+                return U_SENTINEL;
+            }
+            if(c < 0x80) {
+                ++pos;
+                return c;
+            }
+            U8_NEXT_OR_FFFD(u8, pos, length, c);
+            if(CollationFCD::hasTccc(c <= 0xffff ? c : U16_LEAD(c)) &&
+                    (CollationFCD::maybeTibetanCompositeVowel(c) ||
+                        (pos != length && nextHasLccc()))) {
+                // c is not FCD-inert, therefore it is not U+FFFD and it has a valid byte sequence
+                // and we can use U8_LENGTH() rather than a previous-position variable.
+                pos -= U8_LENGTH(c);
+                if(!nextSegment(errorCode)) {
+                    return U_SENTINEL;
+                }
+                continue;
+            }
+            return c;
+        } else if(state == IN_FCD_SEGMENT && pos != limit) {
+            U8_NEXT_OR_FFFD(u8, pos, length, c);
+            return c;
+        } else if(state == IN_NORMALIZED && pos != normalized.length()) {
+            c = normalized.char32At(pos);
+            pos += U16_LENGTH(c);
+            return c;
+        } else {
+            switchToForward();
+        }
+    }
+}
+
+UChar32
+FCDUTF8CollationIterator::previousCodePoint(UErrorCode &errorCode) {
+    UChar32 c;
+    for(;;) {
+        if(state == CHECK_BWD) {
+            if(pos == 0) {
+                return U_SENTINEL;
+            }
+            if((c = u8[pos - 1]) < 0x80) {
+                --pos;
+                return c;
+            }
+            U8_PREV_OR_FFFD(u8, 0, pos, c);
+            if(CollationFCD::hasLccc(c <= 0xffff ? c : U16_LEAD(c)) &&
+                    (CollationFCD::maybeTibetanCompositeVowel(c) ||
+                        (pos != 0 && previousHasTccc()))) {
+                // c is not FCD-inert, therefore it is not U+FFFD and it has a valid byte sequence
+                // and we can use U8_LENGTH() rather than a previous-position variable.
+                pos += U8_LENGTH(c);
+                if(!previousSegment(errorCode)) {
+                    return U_SENTINEL;
+                }
+                continue;
+            }
+            return c;
+        } else if(state == IN_FCD_SEGMENT && pos != start) {
+            U8_PREV_OR_FFFD(u8, 0, pos, c);
+            return c;
+        } else if(state >= IN_NORMALIZED && pos != 0) {
+            c = normalized.char32At(pos - 1);
+            pos -= U16_LENGTH(c);
+            return c;
+        } else {
+            switchToBackward();
+        }
+    }
+}
+
+void
+FCDUTF8CollationIterator::forwardNumCodePoints(int32_t num, UErrorCode &errorCode) {
+    // Specify the class to avoid a virtual-function indirection.
+    // In Java, we would declare this class final.
+    while(num > 0 && FCDUTF8CollationIterator::nextCodePoint(errorCode) >= 0) {
+        --num;
+    }
+}
+
+void
+FCDUTF8CollationIterator::backwardNumCodePoints(int32_t num, UErrorCode &errorCode) {
+    // Specify the class to avoid a virtual-function indirection.
+    // In Java, we would declare this class final.
+    while(num > 0 && FCDUTF8CollationIterator::previousCodePoint(errorCode) >= 0) {
+        --num;
+    }
+}
+
+void
+FCDUTF8CollationIterator::switchToForward() {
+    U_ASSERT(state == CHECK_BWD ||
+             (state == IN_FCD_SEGMENT && pos == limit) ||
+             (state == IN_NORMALIZED && pos == normalized.length()));
+    if(state == CHECK_BWD) {
+        // Turn around from backward checking.
+        start = pos;
+        if(pos == limit) {
+            state = CHECK_FWD;  // Check forward.
+        } else {  // pos < limit
+            state = IN_FCD_SEGMENT;  // Stay in FCD segment.
+        }
+    } else {
+        // Reached the end of the FCD segment.
+        if(state == IN_FCD_SEGMENT) {
+            // The input text segment is FCD, extend it forward.
+        } else {
+            // The input text segment needed to be normalized.
+            // Switch to checking forward from it.
+            start = pos = limit;
+        }
+        state = CHECK_FWD;
+    }
+}
+
+UBool
+FCDUTF8CollationIterator::nextSegment(UErrorCode &errorCode) {
+    if(U_FAILURE(errorCode)) { return FALSE; }
+    U_ASSERT(state == CHECK_FWD && pos != length);
+    // The input text [start..pos[ passes the FCD check.
+    int32_t segmentStart = pos;
+    // Collect the characters being checked, in case they need to be normalized.
+    UnicodeString s;
+    uint8_t prevCC = 0;
+    for(;;) {
+        // Fetch the next character and its fcd16 value.
+        int32_t cpStart = pos;
+        UChar32 c;
+        U8_NEXT_OR_FFFD(u8, pos, length, c);
+        uint16_t fcd16 = nfcImpl.getFCD16(c);
+        uint8_t leadCC = (uint8_t)(fcd16 >> 8);
+        if(leadCC == 0 && cpStart != segmentStart) {
+            // FCD boundary before this character.
+            pos = cpStart;
+            break;
+        }
+        s.append(c);
+        if(leadCC != 0 && (prevCC > leadCC || CollationFCD::isFCD16OfTibetanCompositeVowel(fcd16))) {
+            // Fails FCD check. Find the next FCD boundary and normalize.
+            while(pos != length) {
+                cpStart = pos;
+                U8_NEXT_OR_FFFD(u8, pos, length, c);
+                if(nfcImpl.getFCD16(c) <= 0xff) {
+                    pos = cpStart;
+                    break;
+                }
+                s.append(c);
+            }
+            if(!normalize(s, errorCode)) { return FALSE; }
+            start = segmentStart;
+            limit = pos;
+            state = IN_NORMALIZED;
+            pos = 0;
+            return TRUE;
+        }
+        prevCC = (uint8_t)fcd16;
+        if(pos == length || prevCC == 0) {
+            // FCD boundary after the last character.
+            break;
+        }
+    }
+    limit = pos;
+    pos = segmentStart;
+    U_ASSERT(pos != limit);
+    state = IN_FCD_SEGMENT;
+    return TRUE;
+}
+
+void
+FCDUTF8CollationIterator::switchToBackward() {
+    U_ASSERT(state == CHECK_FWD ||
+             (state == IN_FCD_SEGMENT && pos == start) ||
+             (state >= IN_NORMALIZED && pos == 0));
+    if(state == CHECK_FWD) {
+        // Turn around from forward checking.
+        limit = pos;
+        if(pos == start) {
+            state = CHECK_BWD;  // Check backward.
+        } else {  // pos > start
+            state = IN_FCD_SEGMENT;  // Stay in FCD segment.
+        }
+    } else {
+        // Reached the start of the FCD segment.
+        if(state == IN_FCD_SEGMENT) {
+            // The input text segment is FCD, extend it backward.
+        } else {
+            // The input text segment needed to be normalized.
+            // Switch to checking backward from it.
+            limit = pos = start;
+        }
+        state = CHECK_BWD;
+    }
+}
+
+UBool
+FCDUTF8CollationIterator::previousSegment(UErrorCode &errorCode) {
+    if(U_FAILURE(errorCode)) { return FALSE; }
+    U_ASSERT(state == CHECK_BWD && pos != 0);
+    // The input text [pos..limit[ passes the FCD check.
+    int32_t segmentLimit = pos;
+    // Collect the characters being checked, in case they need to be normalized.
+    UnicodeString s;
+    uint8_t nextCC = 0;
+    for(;;) {
+        // Fetch the previous character and its fcd16 value.
+        int32_t cpLimit = pos;
+        UChar32 c;
+        U8_PREV_OR_FFFD(u8, 0, pos, c);
+        uint16_t fcd16 = nfcImpl.getFCD16(c);
+        uint8_t trailCC = (uint8_t)fcd16;
+        if(trailCC == 0 && cpLimit != segmentLimit) {
+            // FCD boundary after this character.
+            pos = cpLimit;
+            break;
+        }
+        s.append(c);
+        if(trailCC != 0 && ((nextCC != 0 && trailCC > nextCC) ||
+                            CollationFCD::isFCD16OfTibetanCompositeVowel(fcd16))) {
+            // Fails FCD check. Find the previous FCD boundary and normalize.
+            while(fcd16 > 0xff && pos != 0) {
+                cpLimit = pos;
+                U8_PREV_OR_FFFD(u8, 0, pos, c);
+                fcd16 = nfcImpl.getFCD16(c);
+                if(fcd16 == 0) {
+                    pos = cpLimit;
+                    break;
+                }
+                s.append(c);
+            }
+            s.reverse();
+            if(!normalize(s, errorCode)) { return FALSE; }
+            limit = segmentLimit;
+            start = pos;
+            state = IN_NORMALIZED;
+            pos = normalized.length();
+            return TRUE;
+        }
+        nextCC = (uint8_t)(fcd16 >> 8);
+        if(pos == 0 || nextCC == 0) {
+            // FCD boundary before the following character.
+            break;
+        }
+    }
+    start = pos;
+    pos = segmentLimit;
+    U_ASSERT(pos != start);
+    state = IN_FCD_SEGMENT;
+    return TRUE;
+}
+
+UBool
+FCDUTF8CollationIterator::normalize(const UnicodeString &s, UErrorCode &errorCode) {
+    // NFD without argument checking.
+    U_ASSERT(U_SUCCESS(errorCode));
+    nfcImpl.decompose(s, normalized, errorCode);
+    return U_SUCCESS(errorCode);
+}
+
+U_NAMESPACE_END
+
+#endif  // !UCONFIG_NO_COLLATION