parser/html/nsHtml5Portability.cpp

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this
   3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 #include "nsHtml5Portability.h"
   6 #include "jArray.h"
   7 #include "nsAtom.h"
   8 #include "nsHtml5TreeBuilder.h"
   9 #include "nsString.h"
  10 #include "mozilla/CheckedInt.h"
  11
  12 int32_t nsHtml5Portability::checkedAdd(int32_t a, int32_t b) {
  13   mozilla::CheckedInt<int32_t> sum(a);
  14   sum += b;
  15   MOZ_RELEASE_ASSERT(sum.isValid(),
  16                      "HTML input too large for signed 32-bit integer.");
  17   return sum.value();
  18 }
  19
  20 nsAtom* nsHtml5Portability::newLocalNameFromBuffer(char16_t* buf,
  21                                                    int32_t length,
  22                                                    nsHtml5AtomTable* interner) {
  23   NS_ASSERTION(interner, "Didn't get an atom service.");
  24   return interner->GetAtom(nsDependentSubstring(buf, buf + length));
  25 }
  26
  27 static bool ContainsWhiteSpace(mozilla::Span<char16_t> aSpan) {
  28   for (char16_t c : aSpan) {
  29     if (nsContentUtils::IsHTMLWhitespace(c)) {
  30       return true;
  31     }
  32   }
  33   return false;
  34 }
  35
  36 nsHtml5String nsHtml5Portability::newStringFromBuffer(
  37     char16_t* buf, int32_t offset, int32_t length,
  38     nsHtml5TreeBuilder* treeBuilder, bool maybeAtomize) {
  39   if (!length) {
  40     return nsHtml5String::EmptyString();
  41   }
  42   if (maybeAtomize &&
  43       !ContainsWhiteSpace(mozilla::Span(buf + offset, length))) {
  44     return nsHtml5String::FromAtom(
  45         NS_AtomizeMainThread(nsDependentSubstring(buf + offset, length)));
  46   }
  47   return nsHtml5String::FromBuffer(buf + offset, length, treeBuilder);
  48 }
  49
  50 nsHtml5String nsHtml5Portability::newEmptyString() {
  51   return nsHtml5String::EmptyString();
  52 }
  53
  54 nsHtml5String nsHtml5Portability::newStringFromLiteral(const char* literal) {
  55   return nsHtml5String::FromLiteral(literal);
  56 }
  57
  58 nsHtml5String nsHtml5Portability::newStringFromString(nsHtml5String string) {
  59   return string.Clone();
  60 }
  61
  62 jArray<char16_t, int32_t> nsHtml5Portability::newCharArrayFromLocal(
  63     nsAtom* local) {
  64   nsAutoString temp;
  65   local->ToString(temp);
  66   int32_t len = temp.Length();
  67   jArray<char16_t, int32_t> arr = jArray<char16_t, int32_t>::newJArray(len);
  68   memcpy(arr, temp.BeginReading(), len * sizeof(char16_t));
  69   return arr;
  70 }
  71
  72 jArray<char16_t, int32_t> nsHtml5Portability::newCharArrayFromString(
  73     nsHtml5String string) {
  74   MOZ_RELEASE_ASSERT(string);
  75   uint32_t len = string.Length();
  76   MOZ_RELEASE_ASSERT(len < INT32_MAX);
  77   jArray<char16_t, int32_t> arr = jArray<char16_t, int32_t>::newJArray(len);
  78   string.CopyToBuffer(arr);
  79   return arr;
  80 }
  81
  82 bool nsHtml5Portability::localEqualsBuffer(nsAtom* local, char16_t* buf,
  83                                            int32_t length) {
  84   return local->Equals(buf, length);
  85 }
  86
  87 bool nsHtml5Portability::lowerCaseLiteralIsPrefixOfIgnoreAsciiCaseString(
  88     const char* lowerCaseLiteral, nsHtml5String string) {
  89   return string.LowerCaseStartsWithASCII(lowerCaseLiteral);
  90 }
  91
  92 bool nsHtml5Portability::lowerCaseLiteralEqualsIgnoreAsciiCaseString(
  93     const char* lowerCaseLiteral, nsHtml5String string) {
  94   return string.LowerCaseEqualsASCII(lowerCaseLiteral);
  95 }
  96
  97 bool nsHtml5Portability::literalEqualsString(const char* literal,
  98                                              nsHtml5String string) {
  99   return string.EqualsASCII(literal);
 100 }
 101
 102 bool nsHtml5Portability::stringEqualsString(nsHtml5String one,
 103                                             nsHtml5String other) {
 104   return one.Equals(other);
 105 }
 106
 107 void nsHtml5Portability::initializeStatics() {}
 108
 109 void nsHtml5Portability::releaseStatics() {}