Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 356 insertions, 0 deletions

diff --git a/intl/icu/source/i18n/collationcompare.cpp b/intl/icu/source/i18n/collationcompare.cpp
new file mode 100644
index 0000000000..d9048afc27
--- /dev/null
+++ b/intl/icu/source/i18n/collationcompare.cpp
@@ -0,0 +1,356 @@
+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+* Copyright (C) 1996-2015, International Business Machines
+* Corporation and others.  All Rights Reserved.
+*******************************************************************************
+* collationcompare.cpp
+*
+* created on: 2012feb14 with new and old collation code
+* created by: Markus W. Scherer
+*/
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_COLLATION
+
+#include "unicode/ucol.h"
+#include "cmemory.h"
+#include "collation.h"
+#include "collationcompare.h"
+#include "collationiterator.h"
+#include "collationsettings.h"
+#include "uassert.h"
+
+U_NAMESPACE_BEGIN
+
+UCollationResult
+CollationCompare::compareUpToQuaternary(CollationIterator &left, CollationIterator &right,
+                                        const CollationSettings &settings,
+                                        UErrorCode &errorCode) {
+    if(U_FAILURE(errorCode)) { return UCOL_EQUAL; }
+
+    int32_t options = settings.options;
+    uint32_t variableTop;
+    if((options & CollationSettings::ALTERNATE_MASK) == 0) {
+        variableTop = 0;
+    } else {
+        // +1 so that we can use "<" and primary ignorables test out early.
+        variableTop = settings.variableTop + 1;
+    }
+    UBool anyVariable = false;
+
+    // Fetch CEs, compare primaries, store secondary & tertiary weights.
+    for(;;) {
+        // We fetch CEs until we get a non-ignorable primary or reach the end.
+        uint32_t leftPrimary;
+        do {
+            int64_t ce = left.nextCE(errorCode);
+            leftPrimary = (uint32_t)(ce >> 32);
+            if(leftPrimary < variableTop && leftPrimary > Collation::MERGE_SEPARATOR_PRIMARY) {
+                // Variable CE, shift it to quaternary level.
+                // Ignore all following primary ignorables, and shift further variable CEs.
+                anyVariable = true;
+                do {
+                    // Store only the primary of the variable CE.
+                    left.setCurrentCE(ce & INT64_C(0xffffffff00000000));
+                    for(;;) {
+                        ce = left.nextCE(errorCode);
+                        leftPrimary = (uint32_t)(ce >> 32);
+                        if(leftPrimary == 0) {
+                            left.setCurrentCE(0);
+                        } else {
+                            break;
+                        }
+                    }
+                } while(leftPrimary < variableTop &&
+                        leftPrimary > Collation::MERGE_SEPARATOR_PRIMARY);
+            }
+        } while(leftPrimary == 0);
+
+        uint32_t rightPrimary;
+        do {
+            int64_t ce = right.nextCE(errorCode);
+            rightPrimary = (uint32_t)(ce >> 32);
+            if(rightPrimary < variableTop && rightPrimary > Collation::MERGE_SEPARATOR_PRIMARY) {
+                // Variable CE, shift it to quaternary level.
+                // Ignore all following primary ignorables, and shift further variable CEs.
+                anyVariable = true;
+                do {
+                    // Store only the primary of the variable CE.
+                    right.setCurrentCE(ce & INT64_C(0xffffffff00000000));
+                    for(;;) {
+                        ce = right.nextCE(errorCode);
+                        rightPrimary = (uint32_t)(ce >> 32);
+                        if(rightPrimary == 0) {
+                            right.setCurrentCE(0);
+                        } else {
+                            break;
+                        }
+                    }
+                } while(rightPrimary < variableTop &&
+                        rightPrimary > Collation::MERGE_SEPARATOR_PRIMARY);
+            }
+        } while(rightPrimary == 0);
+
+        if(leftPrimary != rightPrimary) {
+            // Return the primary difference, with script reordering.
+            if(settings.hasReordering()) {
+                leftPrimary = settings.reorder(leftPrimary);
+                rightPrimary = settings.reorder(rightPrimary);
+            }
+            return (leftPrimary < rightPrimary) ? UCOL_LESS : UCOL_GREATER;
+        }
+        if(leftPrimary == Collation::NO_CE_PRIMARY) { break; }
+    }
+    if(U_FAILURE(errorCode)) { return UCOL_EQUAL; }
+
+    // Compare the buffered secondary & tertiary weights.
+    // We might skip the secondary level but continue with the case level
+    // which is turned on separately.
+    if(CollationSettings::getStrength(options) >= UCOL_SECONDARY) {
+        if((options & CollationSettings::BACKWARD_SECONDARY) == 0) {
+            int32_t leftIndex = 0;
+            int32_t rightIndex = 0;
+            for(;;) {
+                uint32_t leftSecondary;
+                do {
+                    leftSecondary = ((uint32_t)left.getCE(leftIndex++)) >> 16;
+                } while(leftSecondary == 0);
+
+                uint32_t rightSecondary;
+                do {
+                    rightSecondary = ((uint32_t)right.getCE(rightIndex++)) >> 16;
+                } while(rightSecondary == 0);
+
+                if(leftSecondary != rightSecondary) {
+                    return (leftSecondary < rightSecondary) ? UCOL_LESS : UCOL_GREATER;
+                }
+                if(leftSecondary == Collation::NO_CE_WEIGHT16) { break; }
+            }
+        } else {
+            // The backwards secondary level compares secondary weights backwards
+            // within segments separated by the merge separator (U+FFFE, weight 02).
+            int32_t leftStart = 0;
+            int32_t rightStart = 0;
+            for(;;) {
+                // Find the merge separator or the NO_CE terminator.
+                uint32_t p;
+                int32_t leftLimit = leftStart;
+                while((p = (uint32_t)(left.getCE(leftLimit) >> 32)) >
+                            Collation::MERGE_SEPARATOR_PRIMARY ||
+                        p == 0) {
+                    ++leftLimit;
+                }
+                int32_t rightLimit = rightStart;
+                while((p = (uint32_t)(right.getCE(rightLimit) >> 32)) >
+                            Collation::MERGE_SEPARATOR_PRIMARY ||
+                        p == 0) {
+                    ++rightLimit;
+                }
+
+                // Compare the segments.
+                int32_t leftIndex = leftLimit;
+                int32_t rightIndex = rightLimit;
+                for(;;) {
+                    int32_t leftSecondary = 0;
+                    while(leftSecondary == 0 && leftIndex > leftStart) {
+                        leftSecondary = ((uint32_t)left.getCE(--leftIndex)) >> 16;
+                    }
+
+                    int32_t rightSecondary = 0;
+                    while(rightSecondary == 0 && rightIndex > rightStart) {
+                        rightSecondary = ((uint32_t)right.getCE(--rightIndex)) >> 16;
+                    }
+
+                    if(leftSecondary != rightSecondary) {
+                        return (leftSecondary < rightSecondary) ? UCOL_LESS : UCOL_GREATER;
+                    }
+                    if(leftSecondary == 0) { break; }
+                }
+
+                // Did we reach the end of either string?
+                // Both strings have the same number of merge separators,
+                // or else there would have been a primary-level difference.
+                U_ASSERT(left.getCE(leftLimit) == right.getCE(rightLimit));
+                if(p == Collation::NO_CE_PRIMARY) { break; }
+                // Skip both merge separators and continue.
+                leftStart = leftLimit + 1;
+                rightStart = rightLimit + 1;
+            }
+        }
+    }
+
+    if((options & CollationSettings::CASE_LEVEL) != 0) {
+        int32_t strength = CollationSettings::getStrength(options);
+        int32_t leftIndex = 0;
+        int32_t rightIndex = 0;
+        for(;;) {
+            uint32_t leftCase, leftLower32, rightCase;
+            if(strength == UCOL_PRIMARY) {
+                // Primary+caseLevel: Ignore case level weights of primary ignorables.
+                // Otherwise we would get a-umlaut > a
+                // which is not desirable for accent-insensitive sorting.
+                // Check for (lower 32 bits) == 0 as well because variable CEs are stored
+                // with only primary weights.
+                int64_t ce;
+                do {
+                    ce = left.getCE(leftIndex++);
+                    leftCase = (uint32_t)ce;
+                } while((uint32_t)(ce >> 32) == 0 || leftCase == 0);
+                leftLower32 = leftCase;
+                leftCase &= 0xc000;
+
+                do {
+                    ce = right.getCE(rightIndex++);
+                    rightCase = (uint32_t)ce;
+                } while((uint32_t)(ce >> 32) == 0 || rightCase == 0);
+                rightCase &= 0xc000;
+            } else {
+                // Secondary+caseLevel: By analogy with the above,
+                // ignore case level weights of secondary ignorables.
+                //
+                // Note: A tertiary CE has uppercase case bits (0.0.ut)
+                // to keep tertiary+caseFirst well-formed.
+                //
+                // Tertiary+caseLevel: Also ignore case level weights of secondary ignorables.
+                // Otherwise a tertiary CE's uppercase would be no greater than
+                // a primary/secondary CE's uppercase.
+                // (See UCA well-formedness condition 2.)
+                // We could construct a special case weight higher than uppercase,
+                // but it's simpler to always ignore case weights of secondary ignorables,
+                // turning 0.0.ut into 0.0.0.t.
+                // (See LDML Collation, Case Parameters.)
+                do {
+                    leftCase = (uint32_t)left.getCE(leftIndex++);
+                } while(leftCase <= 0xffff);
+                leftLower32 = leftCase;
+                leftCase &= 0xc000;
+
+                do {
+                    rightCase = (uint32_t)right.getCE(rightIndex++);
+                } while(rightCase <= 0xffff);
+                rightCase &= 0xc000;
+            }
+
+            // No need to handle NO_CE and MERGE_SEPARATOR specially:
+            // There is one case weight for each previous-level weight,
+            // so level length differences were handled there.
+            if(leftCase != rightCase) {
+                if((options & CollationSettings::UPPER_FIRST) == 0) {
+                    return (leftCase < rightCase) ? UCOL_LESS : UCOL_GREATER;
+                } else {
+                    return (leftCase < rightCase) ? UCOL_GREATER : UCOL_LESS;
+                }
+            }
+            if((leftLower32 >> 16) == Collation::NO_CE_WEIGHT16) { break; }
+        }
+    }
+    if(CollationSettings::getStrength(options) <= UCOL_SECONDARY) { return UCOL_EQUAL; }
+
+    uint32_t tertiaryMask = CollationSettings::getTertiaryMask(options);
+
+    int32_t leftIndex = 0;
+    int32_t rightIndex = 0;
+    uint32_t anyQuaternaries = 0;
+    for(;;) {
+        uint32_t leftLower32, leftTertiary;
+        do {
+            leftLower32 = (uint32_t)left.getCE(leftIndex++);
+            anyQuaternaries |= leftLower32;
+            U_ASSERT((leftLower32 & Collation::ONLY_TERTIARY_MASK) != 0 ||
+                     (leftLower32 & 0xc0c0) == 0);
+            leftTertiary = leftLower32 & tertiaryMask;
+        } while(leftTertiary == 0);
+
+        uint32_t rightLower32, rightTertiary;
+        do {
+            rightLower32 = (uint32_t)right.getCE(rightIndex++);
+            anyQuaternaries |= rightLower32;
+            U_ASSERT((rightLower32 & Collation::ONLY_TERTIARY_MASK) != 0 ||
+                     (rightLower32 & 0xc0c0) == 0);
+            rightTertiary = rightLower32 & tertiaryMask;
+        } while(rightTertiary == 0);
+
+        if(leftTertiary != rightTertiary) {
+            if(CollationSettings::sortsTertiaryUpperCaseFirst(options)) {
+                // Pass through NO_CE and keep real tertiary weights larger than that.
+                // Do not change the artificial uppercase weight of a tertiary CE (0.0.ut),
+                // to keep tertiary CEs well-formed.
+                // Their case+tertiary weights must be greater than those of
+                // primary and secondary CEs.
+                if(leftTertiary > Collation::NO_CE_WEIGHT16) {
+                    if(leftLower32 > 0xffff) {
+                        leftTertiary ^= 0xc000;
+                    } else {
+                        leftTertiary += 0x4000;
+                    }
+                }
+                if(rightTertiary > Collation::NO_CE_WEIGHT16) {
+                    if(rightLower32 > 0xffff) {
+                        rightTertiary ^= 0xc000;
+                    } else {
+                        rightTertiary += 0x4000;
+                    }
+                }
+            }
+            return (leftTertiary < rightTertiary) ? UCOL_LESS : UCOL_GREATER;
+        }
+        if(leftTertiary == Collation::NO_CE_WEIGHT16) { break; }
+    }
+    if(CollationSettings::getStrength(options) <= UCOL_TERTIARY) { return UCOL_EQUAL; }
+
+    if(!anyVariable && (anyQuaternaries & 0xc0) == 0) {
+        // If there are no "variable" CEs and no non-zero quaternary weights,
+        // then there are no quaternary differences.
+        return UCOL_EQUAL;
+    }
+
+    leftIndex = 0;
+    rightIndex = 0;
+    for(;;) {
+        uint32_t leftQuaternary;
+        do {
+            int64_t ce = left.getCE(leftIndex++);
+            leftQuaternary = (uint32_t)ce & 0xffff;
+            if(leftQuaternary <= Collation::NO_CE_WEIGHT16) {
+                // Variable primary or completely ignorable or NO_CE.
+                leftQuaternary = (uint32_t)(ce >> 32);
+            } else {
+                // Regular CE, not tertiary ignorable.
+                // Preserve the quaternary weight in bits 7..6.
+                leftQuaternary |= 0xffffff3f;
+            }
+        } while(leftQuaternary == 0);
+
+        uint32_t rightQuaternary;
+        do {
+            int64_t ce = right.getCE(rightIndex++);
+            rightQuaternary = (uint32_t)ce & 0xffff;
+            if(rightQuaternary <= Collation::NO_CE_WEIGHT16) {
+                // Variable primary or completely ignorable or NO_CE.
+                rightQuaternary = (uint32_t)(ce >> 32);
+            } else {
+                // Regular CE, not tertiary ignorable.
+                // Preserve the quaternary weight in bits 7..6.
+                rightQuaternary |= 0xffffff3f;
+            }
+        } while(rightQuaternary == 0);
+
+        if(leftQuaternary != rightQuaternary) {
+            // Return the difference, with script reordering.
+            if(settings.hasReordering()) {
+                leftQuaternary = settings.reorder(leftQuaternary);
+                rightQuaternary = settings.reorder(rightQuaternary);
+            }
+            return (leftQuaternary < rightQuaternary) ? UCOL_LESS : UCOL_GREATER;
+        }
+        if(leftQuaternary == Collation::NO_CE_PRIMARY) { break; }
+    }
+    return UCOL_EQUAL;
+}
+
+U_NAMESPACE_END
+
+#endif  // !UCONFIG_NO_COLLATION