1 files changed, 435 insertions, 0 deletions
diff --git a/intl/unicharutil/util/nsUnicharUtils.cpp b/intl/unicharutil/util/nsUnicharUtils.cpp
new file mode 100644
index 000000000..57c482841
--- /dev/null
+++ b/intl/unicharutil/util/nsUnicharUtils.cpp
@@ -0,0 +1,435 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsUnicharUtils.h"
+#include "nsXPCOMStrings.h"
+#include "nsUTF8Utils.h"
+#include "nsUnicodeProperties.h"
+#include "mozilla/Likely.h"
+#include "mozilla/HashFunctions.h"
+
+// We map x -> x, except for upper-case letters,
+// which we map to their lower-case equivalents.
+static const uint8_t gASCIIToLower [128] = {
+    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
+    0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
+    0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
+    0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
+    0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
+    0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
+    0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
+};
+
+#define IS_ASCII(u)       ((u) < 0x80)
+#define IS_ASCII_UPPER(u) (('A' <= (u)) && ((u) <= 'Z'))
+#define IS_ASCII_LOWER(u) (('a' <= (u)) && ((u) <= 'z'))
+#define IS_ASCII_ALPHA(u) (IS_ASCII_UPPER(u) || IS_ASCII_LOWER(u))
+#define IS_ASCII_SPACE(u) (' ' == (u))
+
+// We want ToLowerCase(uint32_t) and ToLowerCaseASCII(uint32_t) to be fast
+// when they're called from within the case-insensitive comparators, so we
+// define inlined versions.
+static MOZ_ALWAYS_INLINE uint32_t
+ToLowerCase_inline(uint32_t aChar)
+{
+  if (IS_ASCII(aChar)) {
+    return gASCIIToLower[aChar];
+  }
+
+  return mozilla::unicode::GetLowercase(aChar);
+}
+
+static MOZ_ALWAYS_INLINE uint32_t
+ToLowerCaseASCII_inline(const uint32_t aChar)
+{
+  if (IS_ASCII(aChar)) {
+    return gASCIIToLower[aChar];
+  }
+
+  return aChar;
+}
+
+void
+ToLowerCase(nsAString& aString)
+{
+  char16_t *buf = aString.BeginWriting();
+  ToLowerCase(buf, buf, aString.Length());
+}
+
+void
+ToLowerCase(const nsAString& aSource,
+            nsAString& aDest)
+{
+  const char16_t *in;
+  char16_t *out;
+  uint32_t len = NS_StringGetData(aSource, &in);
+  NS_StringGetMutableData(aDest, len, &out);
+  NS_ASSERTION(out, "Uh...");
+  ToLowerCase(in, out, len);
+}
+
+uint32_t
+ToLowerCaseASCII(const uint32_t aChar)
+{
+  return ToLowerCaseASCII_inline(aChar);
+}
+
+void
+ToUpperCase(nsAString& aString)
+{
+  char16_t *buf = aString.BeginWriting();
+  ToUpperCase(buf, buf, aString.Length());
+}
+
+void
+ToUpperCase(const nsAString& aSource,
+            nsAString& aDest)
+{
+  const char16_t *in;
+  char16_t *out;
+  uint32_t len = NS_StringGetData(aSource, &in);
+  NS_StringGetMutableData(aDest, len, &out);
+  NS_ASSERTION(out, "Uh...");
+  ToUpperCase(in, out, len);
+}
+
+#ifdef MOZILLA_INTERNAL_API
+
+int32_t
+nsCaseInsensitiveStringComparator::operator()(const char16_t* lhs,
+                                              const char16_t* rhs,
+                                              uint32_t lLength,
+                                              uint32_t rLength) const
+{
+  return (lLength == rLength) ? CaseInsensitiveCompare(lhs, rhs, lLength) :
+         (lLength > rLength) ? 1 : -1;
+}
+
+int32_t
+nsCaseInsensitiveUTF8StringComparator::operator()(const char* lhs,
+                                                  const char* rhs,
+                                                  uint32_t lLength,
+                                                  uint32_t rLength) const
+{
+  return CaseInsensitiveCompare(lhs, rhs, lLength, rLength);
+}
+
+int32_t
+nsASCIICaseInsensitiveStringComparator::operator()(const char16_t* lhs,
+                                                   const char16_t* rhs,
+                                                   uint32_t lLength,
+                                                   uint32_t rLength) const
+{
+  if (lLength != rLength) {
+    if (lLength > rLength)
+      return 1;
+    return -1;
+  }
+
+  while (rLength) {
+    // we don't care about surrogates here, because we're only
+    // lowercasing the ASCII range
+    char16_t l = *lhs++;
+    char16_t r = *rhs++;
+    if (l != r) {
+      l = ToLowerCaseASCII_inline(l);
+      r = ToLowerCaseASCII_inline(r);
+
+      if (l > r)
+        return 1;
+      else if (r > l)
+        return -1;
+    }
+    rLength--;
+  }
+
+  return 0;
+}
+
+#endif // MOZILLA_INTERNAL_API
+
+uint32_t
+ToLowerCase(uint32_t aChar)
+{
+  return ToLowerCase_inline(aChar);
+}
+
+void
+ToLowerCase(const char16_t *aIn, char16_t *aOut, uint32_t aLen)
+{
+  for (uint32_t i = 0; i < aLen; i++) {
+    uint32_t ch = aIn[i];
+    if (NS_IS_HIGH_SURROGATE(ch) && i < aLen - 1 &&
+        NS_IS_LOW_SURROGATE(aIn[i + 1])) {
+      ch = mozilla::unicode::GetLowercase(SURROGATE_TO_UCS4(ch, aIn[i + 1]));
+      NS_ASSERTION(!IS_IN_BMP(ch), "case mapping crossed BMP/SMP boundary!");
+      aOut[i++] = H_SURROGATE(ch);
+      aOut[i] = L_SURROGATE(ch);
+      continue;
+    }
+    aOut[i] = ToLowerCase(ch);
+  }
+}
+
+uint32_t
+ToUpperCase(uint32_t aChar)
+{
+  if (IS_ASCII(aChar)) {
+    if (IS_ASCII_LOWER(aChar)) {
+      return aChar - 0x20;
+    }
+    return aChar;
+  }
+
+  return mozilla::unicode::GetUppercase(aChar);
+}
+
+void
+ToUpperCase(const char16_t *aIn, char16_t *aOut, uint32_t aLen)
+{
+  for (uint32_t i = 0; i < aLen; i++) {
+    uint32_t ch = aIn[i];
+    if (NS_IS_HIGH_SURROGATE(ch) && i < aLen - 1 &&
+        NS_IS_LOW_SURROGATE(aIn[i + 1])) {
+      ch = mozilla::unicode::GetUppercase(SURROGATE_TO_UCS4(ch, aIn[i + 1]));
+      NS_ASSERTION(!IS_IN_BMP(ch), "case mapping crossed BMP/SMP boundary!");
+      aOut[i++] = H_SURROGATE(ch);
+      aOut[i] = L_SURROGATE(ch);
+      continue;
+    }
+    aOut[i] = ToUpperCase(ch);
+  }
+}
+
+uint32_t
+ToTitleCase(uint32_t aChar)
+{
+  if (IS_ASCII(aChar)) {
+    return ToUpperCase(aChar);
+  }
+
+  return mozilla::unicode::GetTitlecaseForLower(aChar);
+}
+
+int32_t
+CaseInsensitiveCompare(const char16_t *a,
+                       const char16_t *b,
+                       uint32_t len)
+{
+  NS_ASSERTION(a && b, "Do not pass in invalid pointers!");
+
+  if (len) {
+    do {
+      uint32_t c1 = *a++;
+      uint32_t c2 = *b++;
+
+      // Unfortunately, we need to check for surrogates BEFORE we check
+      // for equality, because we could have identical high surrogates
+      // but non-identical characters, so we can't just skip them
+
+      // If c1 isn't a surrogate, we don't bother to check c2;
+      // in the case where it _is_ a surrogate, we're definitely going to get
+      // a mismatch, and don't need to interpret and lowercase it
+
+      if (NS_IS_HIGH_SURROGATE(c1) && len > 1 && NS_IS_LOW_SURROGATE(*a)) {
+        c1 = SURROGATE_TO_UCS4(c1, *a++);
+        if (NS_IS_HIGH_SURROGATE(c2) && NS_IS_LOW_SURROGATE(*b)) {
+          c2 = SURROGATE_TO_UCS4(c2, *b++);
+        }
+        // If c2 wasn't a surrogate, decrementing len means we'd stop
+        // short of the end of string b, but that doesn't actually matter
+        // because we're going to find a mismatch and return early
+        --len;
+      }
+
+      if (c1 != c2) {
+        c1 = ToLowerCase_inline(c1);
+        c2 = ToLowerCase_inline(c2);
+        if (c1 != c2) {
+          if (c1 < c2) {
+            return -1;
+          }
+          return 1;
+        }
+      }
+    } while (--len != 0);
+  }
+  return 0;
+}
+
+// Calculates the codepoint of the UTF8 sequence starting at aStr.  Sets aNext
+// to the byte following the end of the sequence.
+//
+// If the sequence is invalid, or if computing the codepoint would take us off
+// the end of the string (as marked by aEnd), returns -1 and does not set
+// aNext.  Note that this function doesn't check that aStr < aEnd -- it assumes
+// you've done that already.
+static MOZ_ALWAYS_INLINE uint32_t
+GetLowerUTF8Codepoint(const char* aStr, const char* aEnd, const char **aNext)
+{
+  // Convert to unsigned char so that stuffing chars into PRUint32s doesn't
+  // sign extend.
+  const unsigned char *str = (unsigned char*)aStr;
+
+  if (UTF8traits::isASCII(str[0])) {
+    // It's ASCII; just convert to lower-case and return it.
+    *aNext = aStr + 1;
+    return gASCIIToLower[*str];
+  }
+  if (UTF8traits::is2byte(str[0]) && MOZ_LIKELY(aStr + 1 < aEnd)) {
+    // It's a two-byte sequence, so it looks like
+    //  110XXXXX 10XXXXXX.
+    // This is definitely in the BMP, so we can store straightaway into a
+    // uint16_t.
+
+    uint16_t c;
+    c  = (str[0] & 0x1F) << 6;
+    c += (str[1] & 0x3F);
+
+    // we don't go through ToLowerCase here, because we know this isn't
+    // an ASCII character so the ASCII fast-path there is useless
+    c = mozilla::unicode::GetLowercase(c);
+
+    *aNext = aStr + 2;
+    return c;
+  }
+  if (UTF8traits::is3byte(str[0]) && MOZ_LIKELY(aStr + 2 < aEnd)) {
+    // It's a three-byte sequence, so it looks like
+    //  1110XXXX 10XXXXXX 10XXXXXX.
+    // This will just barely fit into 16-bits, so store into a uint16_t.
+
+    uint16_t c;
+    c  = (str[0] & 0x0F) << 12;
+    c += (str[1] & 0x3F) << 6;
+    c += (str[2] & 0x3F);
+
+    c = mozilla::unicode::GetLowercase(c);
+
+    *aNext = aStr + 3;
+    return c;
+  }
+  if (UTF8traits::is4byte(str[0]) && MOZ_LIKELY(aStr + 3 < aEnd)) {
+    // It's a four-byte sequence, so it looks like
+    //   11110XXX 10XXXXXX 10XXXXXX 10XXXXXX.
+
+    uint32_t c;
+    c  = (str[0] & 0x07) << 18;
+    c += (str[1] & 0x3F) << 12;
+    c += (str[2] & 0x3F) << 6;
+    c += (str[3] & 0x3F);
+
+    c = mozilla::unicode::GetLowercase(c);
+
+    *aNext = aStr + 4;
+    return c;
+  }
+
+  // Hm, we don't understand this sequence.
+  return -1;
+}
+
+int32_t CaseInsensitiveCompare(const char *aLeft,
+                               const char *aRight,
+                               uint32_t aLeftBytes,
+                               uint32_t aRightBytes)
+{
+  const char *leftEnd = aLeft + aLeftBytes;
+  const char *rightEnd = aRight + aRightBytes;
+
+  while (aLeft < leftEnd && aRight < rightEnd) {
+    uint32_t leftChar = GetLowerUTF8Codepoint(aLeft, leftEnd, &aLeft);
+    if (MOZ_UNLIKELY(leftChar == uint32_t(-1)))
+      return -1;
+
+    uint32_t rightChar = GetLowerUTF8Codepoint(aRight, rightEnd, &aRight);
+    if (MOZ_UNLIKELY(rightChar == uint32_t(-1)))
+      return -1;
+
+    // Now leftChar and rightChar are lower-case, so we can compare them.
+    if (leftChar != rightChar) {
+      if (leftChar > rightChar)
+        return 1;
+      return -1;
+    }
+  }
+
+  // Make sure that if one string is longer than the other we return the
+  // correct result.
+  if (aLeft < leftEnd)
+    return 1;
+  if (aRight < rightEnd)
+    return -1;
+
+  return 0;
+}
+
+bool
+CaseInsensitiveUTF8CharsEqual(const char* aLeft, const char* aRight,
+                              const char* aLeftEnd, const char* aRightEnd,
+                              const char** aLeftNext, const char** aRightNext,
+                              bool* aErr)
+{
+  NS_ASSERTION(aLeftNext, "Out pointer shouldn't be null.");
+  NS_ASSERTION(aRightNext, "Out pointer shouldn't be null.");
+  NS_ASSERTION(aErr, "Out pointer shouldn't be null.");
+  NS_ASSERTION(aLeft < aLeftEnd, "aLeft must be less than aLeftEnd.");
+  NS_ASSERTION(aRight < aRightEnd, "aRight must be less than aRightEnd.");
+
+  uint32_t leftChar = GetLowerUTF8Codepoint(aLeft, aLeftEnd, aLeftNext);
+  if (MOZ_UNLIKELY(leftChar == uint32_t(-1))) {
+    *aErr = true;
+    return false;
+  }
+
+  uint32_t rightChar = GetLowerUTF8Codepoint(aRight, aRightEnd, aRightNext);
+  if (MOZ_UNLIKELY(rightChar == uint32_t(-1))) {
+    *aErr = true;
+    return false;
+  }
+
+  // Can't have an error past this point.
+  *aErr = false;
+
+  return leftChar == rightChar;
+}
+
+namespace mozilla {
+
+uint32_t
+HashUTF8AsUTF16(const char* aUTF8, uint32_t aLength, bool* aErr)
+{
+  uint32_t hash = 0;
+  const char* s = aUTF8;
+  const char* end = aUTF8 + aLength;
+
+  *aErr = false;
+
+  while (s < end)
+  {
+    uint32_t ucs4 = UTF8CharEnumerator::NextChar(&s, end, aErr);
+    if (*aErr) {
+      return 0;
+    }
+
+    if (ucs4 < PLANE1_BASE) {
+      hash = AddToHash(hash, ucs4);
+    }
+    else {
+      hash = AddToHash(hash, H_SURROGATE(ucs4), L_SURROGATE(ucs4));
+    }
+  }
+
+  return hash;
+}
+
+bool
+IsSegmentBreakSkipChar(uint32_t u)
+{
+  return unicode::IsEastAsianWidthFWH(u) &&
+         unicode::GetScriptCode(u) != unicode::Script::HANGUL;
+}
+
+} // namespace mozilla