Index: runtime/vm/double_conversion.cc |
diff --git a/runtime/vm/double_conversion.cc b/runtime/vm/double_conversion.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..ae9d82e7246364c023daa51a9a51d5ac84ac8592 |
--- /dev/null |
+++ b/runtime/vm/double_conversion.cc |
@@ -0,0 +1,150 @@ |
+// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file |
+// for details. All rights reserved. Use of this source code is governed by a |
+// BSD-style license that can be found in the LICENSE file. |
+ |
+#include "vm/double_conversion.h" |
+ |
+#include "third_party/double-conversion/src/double-conversion.h" |
+ |
+#include "vm/exceptions.h" |
+#include "vm/globals.h" |
+#include "vm/object.h" |
+ |
+namespace dart { |
+ |
+static const char kDoubleToStringCommonExponentChar = 'e'; |
+static const char* kDoubleToStringCommonInfinitySymbol = "Infinity"; |
+static const char* kDoubleToStringCommonNaNSymbol = "NaN"; |
+ |
+bool DoubleToString(double d, String& result) { |
+ static const int kDecimalLow = -6; |
+ static const int kDecimalHigh = 21; |
+ static const int kConversionFlags = |
+ double_conversion::DoubleToStringConverter::EMIT_POSITIVE_EXPONENT_SIGN | |
+ double_conversion::DoubleToStringConverter::EMIT_TRAILING_DECIMAL_POINT | |
+ double_conversion::DoubleToStringConverter::EMIT_TRAILING_ZERO_AFTER_POINT; |
+ const int kBufferSize = 128; |
+ // The output contains the sign, at most kDecimalHigh - 1 digits, |
+ // the decimal point followed by a 0 plus the \0. |
+ ASSERT(kBufferSize >= 1 + (kDecimalHigh - 1) + 1 + 1 + 1); |
+ // Or it contains the sign, a 0, the decimal point, kDecimalLow '0's, |
+ // 17 digits (the precision needed for doubles), plus the \0. |
+ ASSERT(kBufferSize >= 1 + 1 + 1 + kDecimalLow + 17 + 1); |
+ // Alternatively it contains a sign, at most 17 digits (precision needed for |
+ // any double), the decimal point, the exponent character, the exponent's |
+ // sign, at most three exponent digits, plus the \0. |
+ ASSERT(kBufferSize >= 1 + 17 + 1 + 1 + 1 + 3 + 1); |
+ |
+ const double_conversion::DoubleToStringConverter converter( |
+ kConversionFlags, |
+ kDoubleToStringCommonInfinitySymbol, |
+ kDoubleToStringCommonNaNSymbol, |
+ kDoubleToStringCommonExponentChar, |
+ kDecimalLow, |
+ kDecimalHigh, |
+ 0, 0); // Last two values are ignored in shortest mode. |
+ |
+ UNIMPLEMENTED(); |
+ return false; |
+} |
+ |
+bool DoubleToStringAsFixed(double d, int fraction_digits, String& result) { |
+ static const int kMinFractionDigits = 0; |
+ static const int kMaxFractionDigits = 20; |
+ static const int kMaxDigitsBeforePoint = 20; |
+ // The boundaries are exclusive. |
+ static const double kLowerBoundary = -1e21; |
+ static const double kUpperBoundary = 1e21; |
+ static const int kConversionFlags = |
+ double_conversion::DoubleToStringConverter::NO_FLAGS; |
+ const int kBufferSize = 128; |
+ // The output contains the sign, at most kMaxDigitsBeforePoint digits, |
+ // the decimal point followed by at most fraction_digits digits plus the \0. |
+ ASSERT(kBufferSize >= 1 + kMaxDigitsBeforePoint + 1 + kMaxFractionDigits + 1); |
+ |
+ if (d <= kLowerBoundary || d >= kUpperBoundary) { |
+ return false; |
+ } |
+ if (fraction_digits < kMinFractionDigits || |
+ fraction_digits > kMaxFractionDigits) { |
+ return false; |
+ } |
+ |
+ const double_conversion::DoubleToStringConverter converter( |
+ kConversionFlags, |
+ kDoubleToStringCommonInfinitySymbol, |
+ kDoubleToStringCommonNaNSymbol, |
+ kDoubleToStringCommonExponentChar, |
+ 0, 0, 0, 0); // Last four values are ignored in fixed mode. |
+ |
+ char buffer[kBufferSize]; |
+ double_conversion::StringBuilder builder(buffer, kBufferSize); |
+ bool status = converter.ToFixed(d, fraction_digits, &builder); |
+ if (!status) return false; |
+ int length = builder.position(); |
+ result ^= String::New(reinterpret_cast<uint8_t*>(builder.Finalize()), length); |
+ return true; |
+} |
+ |
+ |
+bool DoubleToStringAsExponential(double d, |
+ int fraction_digits, |
+ String& result) { |
+ static const int kMinFractionDigits = 0; |
+ static const int kMaxFractionDigits = 20; |
+ static const int kConversionFlags = |
+ double_conversion::DoubleToStringConverter::EMIT_POSITIVE_EXPONENT_SIGN; |
+ const int kBufferSize = 128; |
+ // The output contains the sign, at most 1 digits, the decimal point followed |
+ // by at most kMaxFractionDigits digits, the exponent-character, the |
+ // exponent-sign and three exponent digits plus \0. |
+ ASSERT(kBufferSize >= 1 + 1 + kMaxFractionDigits + 1 + 1 + 3 + 1); |
+ |
+ if (!(kMinFractionDigits <= fraction_digits && |
+ fraction_digits <= kMaxFractionDigits)) { |
+ return false; |
+ } |
+ |
+ const double_conversion::DoubleToStringConverter converter( |
+ kConversionFlags, |
+ kDoubleToStringCommonInfinitySymbol, |
+ kDoubleToStringCommonNaNSymbol, |
+ kDoubleToStringCommonExponentChar, |
+ 0, 0, 0, 0); // Last four values are ignored in exponential mode. |
+ |
+ UNIMPLEMENTED(); |
+ return false; |
+} |
+ |
+ |
+bool DoubleToStringAsPrecision(double d, int precision, String& result) { |
+ static const int kMinPrecisionDigits = 1; |
+ static const int kMaxPrecisionDigits = 21; |
+ static const int kMaxLeadingPaddingZeroes = 6; |
+ static const int kMaxTrailingPaddingZeroes = 0; |
+ static const int kConversionFlags = |
+ double_conversion::DoubleToStringConverter::EMIT_POSITIVE_EXPONENT_SIGN; |
+ const int kBufferSize = 128; |
+ // The output contains the sign, the decimal point, precision digits, |
+ // the exponent-character, the exponent-sign, three exponent digits |
+ // plus the \0. |
+ ASSERT(kBufferSize >= 1 + 1 + kMaxPrecisionDigits + 1 + 1 + 3 + 1); |
+ |
+ if (!(kMinPrecisionDigits <= precision && precision <= kMaxPrecisionDigits)) { |
+ return false; |
+ } |
+ |
+ const double_conversion::DoubleToStringConverter converter( |
+ kConversionFlags, |
+ kDoubleToStringCommonInfinitySymbol, |
+ kDoubleToStringCommonNaNSymbol, |
+ kDoubleToStringCommonExponentChar, |
+ 0, 0, // Ignored in precision mode. |
+ kMaxLeadingPaddingZeroes, |
+ kMaxTrailingPaddingZeroes); |
+ |
+ UNIMPLEMENTED(); |
+ return false; |
+} |
+ |
+} // namespace dart |