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third_party/WebKit/Source/wtf/dtoa/double-conversion.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
 //       with the distribution.
 //     * Neither the name of Google Inc. nor the names of its
 //       contributors may be used to endorse or promote products derived
 //       from this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include "double-conversion.h"
 
+#include <limits.h>
+#include <math.h>
 #include "bignum-dtoa.h"
 #include "double.h"
 #include "fast-dtoa.h"
 #include "fixed-dtoa.h"
 #include "strtod.h"
 #include "utils.h"
-#include <limits.h>
-#include <math.h>
 
 namespace WTF {
 
 namespace double_conversion {
 
-    const DoubleToStringConverter& DoubleToStringConverter::EcmaScriptConverter() {
-        int flags = UNIQUE_ZERO | EMIT_POSITIVE_EXPONENT_SIGN;
-        static DoubleToStringConverter converter(flags,
-                                                 "Infinity",
-                                                 "NaN",
-                                                 'e',
-                                                 -6, 21,
-                                                 6, 0);
-        return converter;
-    }
-
-
-    bool DoubleToStringConverter::HandleSpecialValues(
-                                                      double value,
-                                                      StringBuilder* result_builder) const {
-        Double double_inspect(value);
-        if (double_inspect.IsInfinite()) {
-            if (infinity_symbol_ == NULL) return false;
-            if (value < 0) {
-                result_builder->AddCharacter('-');
-            }
-            result_builder->AddString(infinity_symbol_);
-            return true;
+const DoubleToStringConverter& DoubleToStringConverter::EcmaScriptConverter() {
+  int flags = UNIQUE_ZERO | EMIT_POSITIVE_EXPONENT_SIGN;
+  static DoubleToStringConverter converter(flags, "Infinity", "NaN", 'e', -6,
+                                           21, 6, 0);
+  return converter;
+}
+
+bool DoubleToStringConverter::HandleSpecialValues(
+    double value,
+    StringBuilder* result_builder) const {
+  Double double_inspect(value);
+  if (double_inspect.IsInfinite()) {
+    if (infinity_symbol_ == NULL)
+      return false;
+    if (value < 0) {
+      result_builder->AddCharacter('-');
+    }
+    result_builder->AddString(infinity_symbol_);
+    return true;
+  }
+  if (double_inspect.IsNan()) {
+    if (nan_symbol_ == NULL)
+      return false;
+    result_builder->AddString(nan_symbol_);
+    return true;
+  }
+  return false;
+}
+
+void DoubleToStringConverter::CreateExponentialRepresentation(
+    const char* decimal_digits,
+    int length,
+    int exponent,
+    StringBuilder* result_builder) const {
+  ASSERT(length != 0);
+  result_builder->AddCharacter(decimal_digits[0]);
+  if (length != 1) {
+    result_builder->AddCharacter('.');
+    result_builder->AddSubstring(&decimal_digits[1], length - 1);
+  }
+  result_builder->AddCharacter(exponent_character_);
+  if (exponent < 0) {
+    result_builder->AddCharacter('-');
+    exponent = -exponent;
+  } else {
+    if ((flags_ & EMIT_POSITIVE_EXPONENT_SIGN) != 0) {
+      result_builder->AddCharacter('+');
+    }
+  }
+  if (exponent == 0) {
+    result_builder->AddCharacter('0');
+    return;
+  }
+  ASSERT(exponent < 1e4);
+  const int kMaxExponentLength = 5;
+  char buffer[kMaxExponentLength + 1];
+  int first_char_pos = kMaxExponentLength;
+  buffer[first_char_pos] = '\0';
+  while (exponent > 0) {
+    buffer[--first_char_pos] = '0' + (exponent % 10);
+    exponent /= 10;
+  }
+  result_builder->AddSubstring(&buffer[first_char_pos],
+                               kMaxExponentLength - first_char_pos);
+}
+
+void DoubleToStringConverter::CreateDecimalRepresentation(
+    const char* decimal_digits,
+    int length,
+    int decimal_point,
+    int digits_after_point,
+    StringBuilder* result_builder) const {
+  // Create a representation that is padded with zeros if needed.
+  if (decimal_point <= 0) {
+    // "0.00000decimal_rep".
+    result_builder->AddCharacter('0');
+    if (digits_after_point > 0) {
+      result_builder->AddCharacter('.');
+      result_builder->AddPadding('0', -decimal_point);
+      ASSERT(length <= digits_after_point - (-decimal_point));
+      result_builder->AddSubstring(decimal_digits, length);
+      int remaining_digits = digits_after_point - (-decimal_point) - length;
+      result_builder->AddPadding('0', remaining_digits);
+    }
+  } else if (decimal_point >= length) {
+    // "decimal_rep0000.00000" or "decimal_rep.0000"
+    result_builder->AddSubstring(decimal_digits, length);
+    result_builder->AddPadding('0', decimal_point - length);
+    if (digits_after_point > 0) {
+      result_builder->AddCharacter('.');
+      result_builder->AddPadding('0', digits_after_point);
+    }
+  } else {
+    // "decima.l_rep000"
+    ASSERT(digits_after_point > 0);
+    result_builder->AddSubstring(decimal_digits, decimal_point);
+    result_builder->AddCharacter('.');
+    ASSERT(length - decimal_point <= digits_after_point);
+    result_builder->AddSubstring(&decimal_digits[decimal_point],
+                                 length - decimal_point);
+    int remaining_digits = digits_after_point - (length - decimal_point);
+    result_builder->AddPadding('0', remaining_digits);
+  }
+  if (digits_after_point == 0) {
+    if ((flags_ & EMIT_TRAILING_DECIMAL_POINT) != 0) {
+      result_builder->AddCharacter('.');
+    }
+    if ((flags_ & EMIT_TRAILING_ZERO_AFTER_POINT) != 0) {
+      result_builder->AddCharacter('0');
+    }
+  }
+}
+
+bool DoubleToStringConverter::ToShortest(double value,
+                                         StringBuilder* result_builder) const {
+  if (Double(value).IsSpecial()) {
+    return HandleSpecialValues(value, result_builder);
+  }
+
+  int decimal_point;
+  bool sign;
+  const int kDecimalRepCapacity = kBase10MaximalLength + 1;
+  char decimal_rep[kDecimalRepCapacity];
+  int decimal_rep_length;
+
+  DoubleToAscii(value, SHORTEST, 0, decimal_rep, kDecimalRepCapacity, &sign,
+                &decimal_rep_length, &decimal_point);
+
+  bool unique_zero = (flags_ & UNIQUE_ZERO) != 0;
+  if (sign && (value != 0.0 || !unique_zero)) {
+    result_builder->AddCharacter('-');
+  }
+
+  int exponent = decimal_point - 1;
+  if ((decimal_in_shortest_low_ <= exponent) &&
+      (exponent < decimal_in_shortest_high_)) {
+    CreateDecimalRepresentation(decimal_rep, decimal_rep_length, decimal_point,
+                                Max(0, decimal_rep_length - decimal_point),
+                                result_builder);
+  } else {
+    CreateExponentialRepresentation(decimal_rep, decimal_rep_length, exponent,
+                                    result_builder);
+  }
+  return true;
+}
+
+bool DoubleToStringConverter::ToFixed(double value,
+                                      int requested_digits,
+                                      StringBuilder* result_builder) const {
+  ASSERT(kMaxFixedDigitsBeforePoint == 60);
+  const double kFirstNonFixed = 1e60;
+
+  if (Double(value).IsSpecial()) {
+    return HandleSpecialValues(value, result_builder);
+  }
+
+  if (requested_digits > kMaxFixedDigitsAfterPoint)
+    return false;
+  if (value >= kFirstNonFixed || value <= -kFirstNonFixed)
+    return false;
+
+  // Find a sufficiently precise decimal representation of n.
+  int decimal_point;
+  bool sign;
+  // Add space for the '\0' byte.
+  const int kDecimalRepCapacity =
+      kMaxFixedDigitsBeforePoint + kMaxFixedDigitsAfterPoint + 1;
+  char decimal_rep[kDecimalRepCapacity];
+  int decimal_rep_length;
+  DoubleToAscii(value, FIXED, requested_digits, decimal_rep,
+                kDecimalRepCapacity, &sign, &decimal_rep_length,
+                &decimal_point);
+
+  bool unique_zero = ((flags_ & UNIQUE_ZERO) != 0);
+  if (sign && (value != 0.0 || !unique_zero)) {
+    result_builder->AddCharacter('-');
+  }
+
+  CreateDecimalRepresentation(decimal_rep, decimal_rep_length, decimal_point,
+                              requested_digits, result_builder);
+  return true;
+}
+
+bool DoubleToStringConverter::ToExponential(
+    double value,
+    int requested_digits,
+    StringBuilder* result_builder) const {
+  if (Double(value).IsSpecial()) {
+    return HandleSpecialValues(value, result_builder);
+  }
+
+  if (requested_digits < -1)
+    return false;
+  if (requested_digits > kMaxExponentialDigits)
+    return false;
+
+  int decimal_point;
+  bool sign;
+  // Add space for digit before the decimal point and the '\0' character.
+  const int kDecimalRepCapacity = kMaxExponentialDigits + 2;
+  ASSERT(kDecimalRepCapacity > kBase10MaximalLength);
+  char decimal_rep[kDecimalRepCapacity];
+  int decimal_rep_length;
+
+  if (requested_digits == -1) {
+    DoubleToAscii(value, SHORTEST, 0, decimal_rep, kDecimalRepCapacity, &sign,
+                  &decimal_rep_length, &decimal_point);
+  } else {
+    DoubleToAscii(value, PRECISION, requested_digits + 1, decimal_rep,
+                  kDecimalRepCapacity, &sign, &decimal_rep_length,
+                  &decimal_point);
+    ASSERT(decimal_rep_length <= requested_digits + 1);
+
+    for (int i = decimal_rep_length; i < requested_digits + 1; ++i) {
+      decimal_rep[i] = '0';
+    }
+    decimal_rep_length = requested_digits + 1;
+  }
+
+  bool unique_zero = ((flags_ & UNIQUE_ZERO) != 0);
+  if (sign && (value != 0.0 || !unique_zero)) {
+    result_builder->AddCharacter('-');
+  }
+
+  int exponent = decimal_point - 1;
+  CreateExponentialRepresentation(decimal_rep, decimal_rep_length, exponent,
+                                  result_builder);
+  return true;
+}
+
+bool DoubleToStringConverter::ToPrecision(double value,
+                                          int precision,
+                                          StringBuilder* result_builder) const {
+  if (Double(value).IsSpecial()) {
+    return HandleSpecialValues(value, result_builder);
+  }
+
+  if (precision < kMinPrecisionDigits || precision > kMaxPrecisionDigits) {
+    return false;
+  }
+
+  // Find a sufficiently precise decimal representation of n.
+  int decimal_point;
+  bool sign;
+  // Add one for the terminating null character.
+  const int kDecimalRepCapacity = kMaxPrecisionDigits + 1;
+  char decimal_rep[kDecimalRepCapacity];
+  int decimal_rep_length;
+
+  DoubleToAscii(value, PRECISION, precision, decimal_rep, kDecimalRepCapacity,
+                &sign, &decimal_rep_length, &decimal_point);
+  ASSERT(decimal_rep_length <= precision);
+
+  bool unique_zero = ((flags_ & UNIQUE_ZERO) != 0);
+  if (sign && (value != 0.0 || !unique_zero)) {
+    result_builder->AddCharacter('-');
+  }
+
+  // The exponent if we print the number as x.xxeyyy. That is with the
+  // decimal point after the first digit.
+  int exponent = decimal_point - 1;
+
+  int extra_zero = ((flags_ & EMIT_TRAILING_ZERO_AFTER_POINT) != 0) ? 1 : 0;
+  if ((-decimal_point + 1 > max_leading_padding_zeroes_in_precision_mode_) ||
+      (decimal_point - precision + extra_zero >
+       max_trailing_padding_zeroes_in_precision_mode_)) {
+    // Fill buffer to contain 'precision' digits.
+    // Usually the buffer is already at the correct length, but 'DoubleToAscii'
+    // is allowed to return less characters.
+    for (int i = decimal_rep_length; i < precision; ++i) {
+      decimal_rep[i] = '0';
+    }
+
+    CreateExponentialRepresentation(decimal_rep, precision, exponent,
+                                    result_builder);
+  } else {
+    CreateDecimalRepresentation(decimal_rep, decimal_rep_length, decimal_point,
+                                Max(0, precision - decimal_point),
+                                result_builder);
+  }
+  return true;
+}
+
+static BignumDtoaMode DtoaToBignumDtoaMode(
+    DoubleToStringConverter::DtoaMode dtoa_mode) {
+  switch (dtoa_mode) {
+    case DoubleToStringConverter::SHORTEST:
+      return BIGNUM_DTOA_SHORTEST;
+    case DoubleToStringConverter::FIXED:
+      return BIGNUM_DTOA_FIXED;
+    case DoubleToStringConverter::PRECISION:
+      return BIGNUM_DTOA_PRECISION;
+    default:
+      UNREACHABLE();
+      return BIGNUM_DTOA_SHORTEST;  // To silence compiler.
+  }
+}
+
+void DoubleToStringConverter::DoubleToAscii(double v,
+                                            DtoaMode mode,
+                                            int requested_digits,
+                                            char* buffer,
+                                            int buffer_length,
+                                            bool* sign,
+                                            int* length,
+                                            int* point) {
+  Vector<char> vector(buffer, buffer_length);
+  ASSERT(!Double(v).IsSpecial());
+  ASSERT(mode == SHORTEST || requested_digits >= 0);
+
+  if (Double(v).Sign() < 0) {
+    *sign = true;
+    v = -v;
+  } else {
+    *sign = false;
+  }
+
+  if (mode == PRECISION && requested_digits == 0) {
+    vector[0] = '\0';
+    *length = 0;
+    return;
+  }
+
+  if (v == 0) {
+    vector[0] = '0';
+    vector[1] = '\0';
+    *length = 1;
+    *point = 1;
+    return;
+  }
+
+  bool fast_worked;
+  switch (mode) {
+    case SHORTEST:
+      fast_worked = FastDtoa(v, FAST_DTOA_SHORTEST, 0, vector, length, point);
+      break;
+    case FIXED:
+      fast_worked = FastFixedDtoa(v, requested_digits, vector, length, point);
+      break;
+    case PRECISION:
+      fast_worked = FastDtoa(v, FAST_DTOA_PRECISION, requested_digits, vector,
+                             length, point);
+      break;
+    default:
+      UNREACHABLE();
+      fast_worked = false;
+  }
+  if (fast_worked)
+    return;
+
+  // If the fast dtoa didn't succeed use the slower bignum version.
+  BignumDtoaMode bignum_mode = DtoaToBignumDtoaMode(mode);
+  BignumDtoa(v, bignum_mode, requested_digits, vector, length, point);
+  vector[*length] = '\0';
+}
+
+// Maximum number of significant digits in decimal representation.
+// The longest possible double in decimal representation is
+// (2^53 - 1) * 2 ^ -1074 that is (2 ^ 53 - 1) * 5 ^ 1074 / 10 ^ 1074
+// (768 digits). If we parse a number whose first digits are equal to a
+// mean of 2 adjacent doubles (that could have up to 769 digits) the result
+// must be rounded to the bigger one unless the tail consists of zeros, so
+// we don't need to preserve all the digits.
+const int kMaxSignificantDigits = 772;
+
+static double SignedZero(bool sign) {
+  return sign ? -0.0 : 0.0;
+}
+
+double StringToDoubleConverter::StringToDouble(
+    const char* input,
+    size_t length,
+    size_t* processed_characters_count) {
+  const char* current = input;
+  const char* end = input + length;
+
+  *processed_characters_count = 0;
+
+  // To make sure that iterator dereferencing is valid the following
+  // convention is used:
+  // 1. Each '++current' statement is followed by check for equality to 'end'.
+  // 3. If 'current' becomes equal to 'end' the function returns or goes to
+  // 'parsing_done'.
+  // 4. 'current' is not dereferenced after the 'parsing_done' label.
+  // 5. Code before 'parsing_done' may rely on 'current != end'.
+  if (current == end)
+    return 0.0;
+
+  // The longest form of simplified number is: "-<significant digits>.1eXXX\0".
+  const int kBufferSize = kMaxSignificantDigits + 10;
+  char buffer[kBufferSize];  // NOLINT: size is known at compile time.
+  int buffer_pos = 0;
+
+  // Exponent will be adjusted if insignificant digits of the integer part
+  // or insignificant leading zeros of the fractional part are dropped.
+  int exponent = 0;
+  int significant_digits = 0;
+  int insignificant_digits = 0;
+  bool nonzero_digit_dropped = false;
+  bool sign = false;
+
+  if (*current == '+' || *current == '-') {
+    sign = (*current == '-');
+    ++current;
+    if (current == end)
+      return 0.0;
+  }
+
+  bool leading_zero = false;
+  if (*current == '0') {
+    ++current;
+    if (current == end) {
+      *processed_characters_count = current - input;
+      return SignedZero(sign);
+    }
+
+    leading_zero = true;
+
+    // Ignore leading zeros in the integer part.
+    while (*current == '0') {
+      ++current;
+      if (current == end) {
+        *processed_characters_count = current - input;
+        return SignedZero(sign);
+      }
+    }
+  }
+
+  // Copy significant digits of the integer part (if any) to the buffer.
+  while (*current >= '0' && *current <= '9') {
+    if (significant_digits < kMaxSignificantDigits) {
+      ASSERT(buffer_pos < kBufferSize);
+      buffer[buffer_pos++] = static_cast<char>(*current);
+      significant_digits++;
+    } else {
+      insignificant_digits++;  // Move the digit into the exponential part.
+      nonzero_digit_dropped = nonzero_digit_dropped || *current != '0';
+    }
+    ++current;
+    if (current == end)
+      goto parsing_done;
+  }
+
+  if (*current == '.') {
+    ++current;
+    if (current == end) {
+      if (significant_digits == 0 && !leading_zero) {
+        return 0.0;
+      } else {
+        goto parsing_done;
+      }
+    }
+
+    if (significant_digits == 0) {
+      // Integer part consists of 0 or is absent. Significant digits start after
+      // leading zeros (if any).
+      while (*current == '0') {
+        ++current;
+        if (current == end) {
+          *processed_characters_count = current - input;
+          return SignedZero(sign);
         }
-        if (double_inspect.IsNan()) {
-            if (nan_symbol_ == NULL) return false;
-            result_builder->AddString(nan_symbol_);
-            return true;
-        }
-        return false;
-    }
-
-
-    void DoubleToStringConverter::CreateExponentialRepresentation(
-                                                                  const char* decimal_digits,
-                                                                  int length,
-                                                                  int exponent,
-                                                                  StringBuilder* result_builder) const {
-        ASSERT(length != 0);
-        result_builder->AddCharacter(decimal_digits[0]);
-        if (length != 1) {
-            result_builder->AddCharacter('.');
-            result_builder->AddSubstring(&decimal_digits[1], length-1);
-        }
-        result_builder->AddCharacter(exponent_character_);
-        if (exponent < 0) {
-            result_builder->AddCharacter('-');
-            exponent = -exponent;
-        } else {
-            if ((flags_ & EMIT_POSITIVE_EXPONENT_SIGN) != 0) {
-                result_builder->AddCharacter('+');
-            }
-        }
-        if (exponent == 0) {
-            result_builder->AddCharacter('0');
-            return;
-        }
-        ASSERT(exponent < 1e4);
-        const int kMaxExponentLength = 5;
-        char buffer[kMaxExponentLength + 1];
-        int first_char_pos = kMaxExponentLength;
-        buffer[first_char_pos] = '\0';
-        while (exponent > 0) {
-            buffer[--first_char_pos] = '0' + (exponent % 10);
-            exponent /= 10;
-        }
-        result_builder->AddSubstring(&buffer[first_char_pos],
-                                     kMaxExponentLength - first_char_pos);
-    }
-
-
-    void DoubleToStringConverter::CreateDecimalRepresentation(
-                                                              const char* decimal_digits,
-                                                              int length,
-                                                              int decimal_point,
-                                                              int digits_after_point,
-                                                              StringBuilder* result_builder) const {
-        // Create a representation that is padded with zeros if needed.
-        if (decimal_point <= 0) {
-            // "0.00000decimal_rep".
-            result_builder->AddCharacter('0');
-            if (digits_after_point > 0) {
-                result_builder->AddCharacter('.');
-                result_builder->AddPadding('0', -decimal_point);
-                ASSERT(length <= digits_after_point - (-decimal_point));
-                result_builder->AddSubstring(decimal_digits, length);
-                int remaining_digits = digits_after_point - (-decimal_point) - length;
-                result_builder->AddPadding('0', remaining_digits);
-            }
-        } else if (decimal_point >= length) {
-            // "decimal_rep0000.00000" or "decimal_rep.0000"
-            result_builder->AddSubstring(decimal_digits, length);
-            result_builder->AddPadding('0', decimal_point - length);
-            if (digits_after_point > 0) {
-                result_builder->AddCharacter('.');
-                result_builder->AddPadding('0', digits_after_point);
-            }
-        } else {
-            // "decima.l_rep000"
-            ASSERT(digits_after_point > 0);
-            result_builder->AddSubstring(decimal_digits, decimal_point);
-            result_builder->AddCharacter('.');
-            ASSERT(length - decimal_point <= digits_after_point);
-            result_builder->AddSubstring(&decimal_digits[decimal_point],
-                                         length - decimal_point);
-            int remaining_digits = digits_after_point - (length - decimal_point);
-            result_builder->AddPadding('0', remaining_digits);
-        }
-        if (digits_after_point == 0) {
-            if ((flags_ & EMIT_TRAILING_DECIMAL_POINT) != 0) {
-                result_builder->AddCharacter('.');
-            }
-            if ((flags_ & EMIT_TRAILING_ZERO_AFTER_POINT) != 0) {
-                result_builder->AddCharacter('0');
-            }
-        }
-    }
-
-
-    bool DoubleToStringConverter::ToShortest(double value,
-                                             StringBuilder* result_builder) const {
-        if (Double(value).IsSpecial()) {
-            return HandleSpecialValues(value, result_builder);
-        }
-
-        int decimal_point;
-        bool sign;
-        const int kDecimalRepCapacity = kBase10MaximalLength + 1;
-        char decimal_rep[kDecimalRepCapacity];
-        int decimal_rep_length;
-
-        DoubleToAscii(value, SHORTEST, 0, decimal_rep, kDecimalRepCapacity,
-                      &sign, &decimal_rep_length, &decimal_point);
-
-        bool unique_zero = (flags_ & UNIQUE_ZERO) != 0;
-        if (sign && (value != 0.0 || !unique_zero)) {
-            result_builder->AddCharacter('-');
-        }
-
-        int exponent = decimal_point - 1;
-        if ((decimal_in_shortest_low_ <= exponent) &&
-            (exponent < decimal_in_shortest_high_)) {
-            CreateDecimalRepresentation(decimal_rep, decimal_rep_length,
-                                        decimal_point,
-                                        Max(0, decimal_rep_length - decimal_point),
-                                        result_builder);
-        } else {
-            CreateExponentialRepresentation(decimal_rep, decimal_rep_length, exponent,
-                                            result_builder);
-        }
-        return true;
-    }
-
-
-    bool DoubleToStringConverter::ToFixed(double value,
-                                          int requested_digits,
-                                          StringBuilder* result_builder) const {
-        ASSERT(kMaxFixedDigitsBeforePoint == 60);
-        const double kFirstNonFixed = 1e60;
-
-        if (Double(value).IsSpecial()) {
-            return HandleSpecialValues(value, result_builder);
-        }
-
-        if (requested_digits > kMaxFixedDigitsAfterPoint) return false;
-        if (value >= kFirstNonFixed || value <= -kFirstNonFixed) return false;
-
-        // Find a sufficiently precise decimal representation of n.
-        int decimal_point;
-        bool sign;
-        // Add space for the '\0' byte.
-        const int kDecimalRepCapacity =
-        kMaxFixedDigitsBeforePoint + kMaxFixedDigitsAfterPoint + 1;
-        char decimal_rep[kDecimalRepCapacity];
-        int decimal_rep_length;
-        DoubleToAscii(value, FIXED, requested_digits,
-                      decimal_rep, kDecimalRepCapacity,
-                      &sign, &decimal_rep_length, &decimal_point);
-
-        bool unique_zero = ((flags_ & UNIQUE_ZERO) != 0);
-        if (sign && (value != 0.0 || !unique_zero)) {
-            result_builder->AddCharacter('-');
-        }
-
-        CreateDecimalRepresentation(decimal_rep, decimal_rep_length, decimal_point,
-                                    requested_digits, result_builder);
-        return true;
-    }
-
-
-    bool DoubleToStringConverter::ToExponential(
-                                                double value,
-                                                int requested_digits,
-                                                StringBuilder* result_builder) const {
-        if (Double(value).IsSpecial()) {
-            return HandleSpecialValues(value, result_builder);
-        }
-
-        if (requested_digits < -1) return false;
-        if (requested_digits > kMaxExponentialDigits) return false;
-
-        int decimal_point;
-        bool sign;
-        // Add space for digit before the decimal point and the '\0' character.
-        const int kDecimalRepCapacity = kMaxExponentialDigits + 2;
-        ASSERT(kDecimalRepCapacity > kBase10MaximalLength);
-        char decimal_rep[kDecimalRepCapacity];
-        int decimal_rep_length;
-
-        if (requested_digits == -1) {
-            DoubleToAscii(value, SHORTEST, 0,
-                          decimal_rep, kDecimalRepCapacity,
-                          &sign, &decimal_rep_length, &decimal_point);
-        } else {
-            DoubleToAscii(value, PRECISION, requested_digits + 1,
-                          decimal_rep, kDecimalRepCapacity,
-                          &sign, &decimal_rep_length, &decimal_point);
-            ASSERT(decimal_rep_length <= requested_digits + 1);
-
-            for (int i = decimal_rep_length; i < requested_digits + 1; ++i) {
-                decimal_rep[i] = '0';
-            }
-            decimal_rep_length = requested_digits + 1;
-        }
-
-        bool unique_zero = ((flags_ & UNIQUE_ZERO) != 0);
-        if (sign && (value != 0.0 || !unique_zero)) {
-            result_builder->AddCharacter('-');
-        }
-
-        int exponent = decimal_point - 1;
-        CreateExponentialRepresentation(decimal_rep,
-                                        decimal_rep_length,
-                                        exponent,
-                                        result_builder);
-        return true;
-    }
-
-
-    bool DoubleToStringConverter::ToPrecision(double value,
-                                              int precision,
-                                              StringBuilder* result_builder) const {
-        if (Double(value).IsSpecial()) {
-            return HandleSpecialValues(value, result_builder);
-        }
-
-        if (precision < kMinPrecisionDigits || precision > kMaxPrecisionDigits) {
-            return false;
-        }
-
-        // Find a sufficiently precise decimal representation of n.
-        int decimal_point;
-        bool sign;
-        // Add one for the terminating null character.
-        const int kDecimalRepCapacity = kMaxPrecisionDigits + 1;
-        char decimal_rep[kDecimalRepCapacity];
-        int decimal_rep_length;
-
-        DoubleToAscii(value, PRECISION, precision,
-                      decimal_rep, kDecimalRepCapacity,
-                      &sign, &decimal_rep_length, &decimal_point);
-        ASSERT(decimal_rep_length <= precision);
-
-        bool unique_zero = ((flags_ & UNIQUE_ZERO) != 0);
-        if (sign && (value != 0.0 || !unique_zero)) {
-            result_builder->AddCharacter('-');
-        }
-
-        // The exponent if we print the number as x.xxeyyy. That is with the
-        // decimal point after the first digit.
-        int exponent = decimal_point - 1;
-
-        int extra_zero = ((flags_ & EMIT_TRAILING_ZERO_AFTER_POINT) != 0) ? 1 : 0;
-        if ((-decimal_point + 1 > max_leading_padding_zeroes_in_precision_mode_) ||
-            (decimal_point - precision + extra_zero >
-             max_trailing_padding_zeroes_in_precision_mode_)) {
-                // Fill buffer to contain 'precision' digits.
-                // Usually the buffer is already at the correct length, but 'DoubleToAscii'
-                // is allowed to return less characters.
-                for (int i = decimal_rep_length; i < precision; ++i) {
-                    decimal_rep[i] = '0';
-                }
-
-                CreateExponentialRepresentation(decimal_rep,
-                                                precision,
-                                                exponent,
-                                                result_builder);
-            } else {
-                CreateDecimalRepresentation(decimal_rep, decimal_rep_length, decimal_point,
-                                            Max(0, precision - decimal_point),
-                                            result_builder);
-            }
-        return true;
-    }
-
-
-    static BignumDtoaMode DtoaToBignumDtoaMode(
-                                               DoubleToStringConverter::DtoaMode dtoa_mode) {
-        switch (dtoa_mode) {
-            case DoubleToStringConverter::SHORTEST:  return BIGNUM_DTOA_SHORTEST;
-            case DoubleToStringConverter::FIXED:     return BIGNUM_DTOA_FIXED;
-            case DoubleToStringConverter::PRECISION: return BIGNUM_DTOA_PRECISION;
-            default:
-                UNREACHABLE();
-                return BIGNUM_DTOA_SHORTEST;  // To silence compiler.
-        }
-    }
-
-
-    void DoubleToStringConverter::DoubleToAscii(double v,
-                                                DtoaMode mode,
-                                                int requested_digits,
-                                                char* buffer,
-                                                int buffer_length,
-                                                bool* sign,
-                                                int* length,
-                                                int* point) {
-        Vector<char> vector(buffer, buffer_length);
-        ASSERT(!Double(v).IsSpecial());
-        ASSERT(mode == SHORTEST || requested_digits >= 0);
-
-        if (Double(v).Sign() < 0) {
-            *sign = true;
-            v = -v;
-        } else {
-            *sign = false;
-        }
-
-        if (mode == PRECISION && requested_digits == 0) {
-            vector[0] = '\0';
-            *length = 0;
-            return;
-        }
-
-        if (v == 0) {
-            vector[0] = '0';
-            vector[1] = '\0';
-            *length = 1;
-            *point = 1;
-            return;
-        }
-
-        bool fast_worked;
-        switch (mode) {
-            case SHORTEST:
-                fast_worked = FastDtoa(v, FAST_DTOA_SHORTEST, 0, vector, length, point);
-                break;
-            case FIXED:
-                fast_worked = FastFixedDtoa(v, requested_digits, vector, length, point);
-                break;
-            case PRECISION:
-                fast_worked = FastDtoa(v, FAST_DTOA_PRECISION, requested_digits,
-                                       vector, length, point);
-                break;
-            default:
-                UNREACHABLE();
-                fast_worked = false;
-        }
-        if (fast_worked) return;
-
-        // If the fast dtoa didn't succeed use the slower bignum version.
-        BignumDtoaMode bignum_mode = DtoaToBignumDtoaMode(mode);
-        BignumDtoa(v, bignum_mode, requested_digits, vector, length, point);
-        vector[*length] = '\0';
-    }
-
-
-    // Maximum number of significant digits in decimal representation.
-    // The longest possible double in decimal representation is
-    // (2^53 - 1) * 2 ^ -1074 that is (2 ^ 53 - 1) * 5 ^ 1074 / 10 ^ 1074
-    // (768 digits). If we parse a number whose first digits are equal to a
-    // mean of 2 adjacent doubles (that could have up to 769 digits) the result
-    // must be rounded to the bigger one unless the tail consists of zeros, so
-    // we don't need to preserve all the digits.
-    const int kMaxSignificantDigits = 772;
-
-
-    static double SignedZero(bool sign) {
-        return sign ? -0.0 : 0.0;
-    }
-
-
-    double StringToDoubleConverter::StringToDouble(
-                                                   const char* input,
-                                                   size_t length,
-                                                   size_t* processed_characters_count) {
-        const char* current = input;
-        const char* end = input + length;
-
-        *processed_characters_count = 0;
-
-        // To make sure that iterator dereferencing is valid the following
-        // convention is used:
-        // 1. Each '++current' statement is followed by check for equality to 'end'.
-        // 3. If 'current' becomes equal to 'end' the function returns or goes to
-        // 'parsing_done'.
-        // 4. 'current' is not dereferenced after the 'parsing_done' label.
-        // 5. Code before 'parsing_done' may rely on 'current != end'.
-        if (current == end) return 0.0;
-
-        // The longest form of simplified number is: "-<significant digits>.1eXXX\0".
-        const int kBufferSize = kMaxSignificantDigits + 10;
-        char buffer[kBufferSize];  // NOLINT: size is known at compile time.
-        int buffer_pos = 0;
-
-        // Exponent will be adjusted if insignificant digits of the integer part
-        // or insignificant leading zeros of the fractional part are dropped.
-        int exponent = 0;
-        int significant_digits = 0;
-        int insignificant_digits = 0;
-        bool nonzero_digit_dropped = false;
-        bool sign = false;
-
-        if (*current == '+' || *current == '-') {
-            sign = (*current == '-');
-            ++current;
-            if (current == end) return 0.0;
-        }
-
-        bool leading_zero = false;
-        if (*current == '0') {
-            ++current;
-            if (current == end) {
-                *processed_characters_count = current - input;
-                return SignedZero(sign);
-            }
-
-            leading_zero = true;
-
-            // Ignore leading zeros in the integer part.
-            while (*current == '0') {
-                ++current;
-                if (current == end) {
-                    *processed_characters_count = current - input;
-                    return SignedZero(sign);
-                }
-            }
-        }
-
-        // Copy significant digits of the integer part (if any) to the buffer.
-        while (*current >= '0' && *current <= '9') {
-            if (significant_digits < kMaxSignificantDigits) {
-                ASSERT(buffer_pos < kBufferSize);
-                buffer[buffer_pos++] = static_cast<char>(*current);
-                significant_digits++;
-            } else {
-                insignificant_digits++;  // Move the digit into the exponential part.
-                nonzero_digit_dropped = nonzero_digit_dropped || *current != '0';
-            }
-            ++current;
-            if (current == end) goto parsing_done;
-        }
-
-        if (*current == '.') {
-            ++current;
-            if (current == end) {
-                if (significant_digits == 0 && !leading_zero) {
-                    return 0.0;
-                } else {
-                    goto parsing_done;
-                }
-            }
-
-            if (significant_digits == 0) {
-                // Integer part consists of 0 or is absent. Significant digits start after
-                // leading zeros (if any).
-                while (*current == '0') {
-                    ++current;
-                    if (current == end) {
-                        *processed_characters_count = current - input;
-                        return SignedZero(sign);
-                    }
-                    exponent--;  // Move this 0 into the exponent.
-                }
-            }
-
-            // There is a fractional part.
-            while (*current >= '0' && *current <= '9') {
-                if (significant_digits < kMaxSignificantDigits) {
-                    ASSERT(buffer_pos < kBufferSize);
-                    buffer[buffer_pos++] = static_cast<char>(*current);
-                    significant_digits++;
-                    exponent--;
-                } else {
-                    // Ignore insignificant digits in the fractional part.
-                    nonzero_digit_dropped = nonzero_digit_dropped || *current != '0';
-                }
-                ++current;
-                if (current == end) goto parsing_done;
-            }
-        }
-
-        if (!leading_zero && exponent == 0 && significant_digits == 0) {
-            // If leading_zeros is true then the string contains zeros.
-            // If exponent < 0 then string was [+-]\.0*...
-            // If significant_digits != 0 the string is not equal to 0.
-            // Otherwise there are no digits in the string.
-            return 0.0;
-        }
-
-        // Parse exponential part.
-        if (*current == 'e' || *current == 'E') {
-            ++current;
-            if (current == end) {
-                --current;
-                goto parsing_done;
-            }
-            char sign = 0;
-            if (*current == '+' || *current == '-') {
-                sign = static_cast<char>(*current);
-                ++current;
-                if (current == end) {
-                    current -= 2;
-                    goto parsing_done;
-                }
-            }
-
-            if (*current < '0' || *current > '9') {
-                if (sign)
-                    --current;
-                --current;
-                goto parsing_done;
-            }
-
-            const int max_exponent = INT_MAX / 2;
-            ASSERT(-max_exponent / 2 <= exponent && exponent <= max_exponent / 2);
-            int num = 0;
-            do {
-                // Check overflow.
-                int digit = *current - '0';
-                if (num >= max_exponent / 10
-                    && !(num == max_exponent / 10 && digit <= max_exponent % 10)) {
-                    num = max_exponent;
-                } else {
-                    num = num * 10 + digit;
-                }
-                ++current;
-            } while (current != end && *current >= '0' && *current <= '9');
-
-            exponent += (sign == '-' ? -num : num);
-        }
-
-    parsing_done:
-        exponent += insignificant_digits;
-
-        if (nonzero_digit_dropped) {
-            buffer[buffer_pos++] = '1';
-            exponent--;
-        }
-
+        exponent--;  // Move this 0 into the exponent.
+      }
+    }
+
+    // There is a fractional part.
+    while (*current >= '0' && *current <= '9') {
+      if (significant_digits < kMaxSignificantDigits) {
         ASSERT(buffer_pos < kBufferSize);
-        buffer[buffer_pos] = '\0';
-
-        double converted = Strtod(Vector<const char>(buffer, buffer_pos), exponent);
-        *processed_characters_count = current - input;
-        return sign? -converted: converted;
-    }
+        buffer[buffer_pos++] = static_cast<char>(*current);
+        significant_digits++;
+        exponent--;
+      } else {
+        // Ignore insignificant digits in the fractional part.
+        nonzero_digit_dropped = nonzero_digit_dropped || *current != '0';
+      }
+      ++current;
+      if (current == end)
+        goto parsing_done;
+    }
+  }
+
+  if (!leading_zero && exponent == 0 && significant_digits == 0) {
+    // If leading_zeros is true then the string contains zeros.
+    // If exponent < 0 then string was [+-]\.0*...
+    // If significant_digits != 0 the string is not equal to 0.
+    // Otherwise there are no digits in the string.
+    return 0.0;
+  }
+
+  // Parse exponential part.
+  if (*current == 'e' || *current == 'E') {
+    ++current;
+    if (current == end) {
+      --current;
+      goto parsing_done;
+    }
+    char sign = 0;
+    if (*current == '+' || *current == '-') {
+      sign = static_cast<char>(*current);
+      ++current;
+      if (current == end) {
+        current -= 2;
+        goto parsing_done;
+      }
+    }
+
+    if (*current < '0' || *current > '9') {
+      if (sign)
+        --current;
+      --current;
+      goto parsing_done;
+    }
+
+    const int max_exponent = INT_MAX / 2;
+    ASSERT(-max_exponent / 2 <= exponent && exponent <= max_exponent / 2);
+    int num = 0;
+    do {
+      // Check overflow.
+      int digit = *current - '0';
+      if (num >= max_exponent / 10 &&
+          !(num == max_exponent / 10 && digit <= max_exponent % 10)) {
+        num = max_exponent;
+      } else {
+        num = num * 10 + digit;
+      }
+      ++current;
+    } while (current != end && *current >= '0' && *current <= '9');
+
+    exponent += (sign == '-' ? -num : num);
+  }
+
+parsing_done:
+  exponent += insignificant_digits;
+
+  if (nonzero_digit_dropped) {
+    buffer[buffer_pos++] = '1';
+    exponent--;
+  }
+
+  ASSERT(buffer_pos < kBufferSize);
+  buffer[buffer_pos] = '\0';
+
+  double converted = Strtod(Vector<const char>(buffer, buffer_pos), exponent);
+  *processed_characters_count = current - input;
+  return sign ? -converted : converted;
+}
 
 }  // namespace double_conversion
 
-} // namespace WTF
+}  // namespace WTF