v8/src/v8conversions.cc

// Copyright 2011 the V8 project authors. All rights reserved.
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#include <stdarg.h>
#include <limits.h>

#include "v8.h"

#include "conversions-inl.h"
#include "v8conversions.h"
#include "dtoa.h"
#include "factory.h"
#include "strtod.h"

namespace v8 {
namespace internal {

namespace {

// C++-style iterator adaptor for StringCharacterStream
// (unlike C++ iterators the end-marker has different type).
class StringCharacterStreamIterator {
 public:
  class EndMarker {};

  explicit StringCharacterStreamIterator(StringCharacterStream* stream);

  uint16_t operator*() const;
  void operator++();
  bool operator==(EndMarker const&) const { return end_; }
  bool operator!=(EndMarker const& m) const { return !end_; }

 private:
  StringCharacterStream* const stream_;
  uint16_t current_;
  bool end_;
};


StringCharacterStreamIterator::StringCharacterStreamIterator(
    StringCharacterStream* stream) : stream_(stream) {
  ++(*this);
}

uint16_t StringCharacterStreamIterator::operator*() const {
  return current_;
}


void StringCharacterStreamIterator::operator++() {
  end_ = !stream_->HasMore();
  if (!end_) {
    current_ = stream_->GetNext();
  }
}
}  // End anonymous namespace.


double StringToDouble(UnicodeCache* unicode_cache,
                      String* str, int flags, double empty_string_val) {
  StringShape shape(str);
  // TODO(dcarney): Use a Visitor here.
  if (shape.IsSequentialAscii()) {
    const uint8_t* begin = SeqOneByteString::cast(str)->GetChars();
    const uint8_t* end = begin + str->length();
    return InternalStringToDouble(unicode_cache, begin, end, flags,
                                  empty_string_val);
  } else if (shape.IsSequentialTwoByte()) {
    const uc16* begin = SeqTwoByteString::cast(str)->GetChars();
    const uc16* end = begin + str->length();
    return InternalStringToDouble(unicode_cache, begin, end, flags,
                                  empty_string_val);
  } else {
    ConsStringIteratorOp op;
    StringCharacterStream stream(str, &op);
    return InternalStringToDouble(unicode_cache,
                                  StringCharacterStreamIterator(&stream),
                                  StringCharacterStreamIterator::EndMarker(),
                                  flags,
                                  empty_string_val);
  }
}


double StringToInt(UnicodeCache* unicode_cache,
                   String* str,
                   int radix) {
  StringShape shape(str);
  // TODO(dcarney): Use a Visitor here.
  if (shape.IsSequentialAscii()) {
    const uint8_t* begin = SeqOneByteString::cast(str)->GetChars();
    const uint8_t* end = begin + str->length();
    return InternalStringToInt(unicode_cache, begin, end, radix);
  } else if (shape.IsSequentialTwoByte()) {
    const uc16* begin = SeqTwoByteString::cast(str)->GetChars();
    const uc16* end = begin + str->length();
    return InternalStringToInt(unicode_cache, begin, end, radix);
  } else {
    ConsStringIteratorOp op;
    StringCharacterStream stream(str, &op);
    return InternalStringToInt(unicode_cache,
                               StringCharacterStreamIterator(&stream),
                               StringCharacterStreamIterator::EndMarker(),
                               radix);
  }
}

} }  // namespace v8::internal