| // © 2018 and later: Unicode, Inc. and others. |
| // License & terms of use: http://www.unicode.org/copyright.html |
| // |
| // From the double-conversion library. Original license: |
| // |
| // Copyright 2012 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. |
| |
| // ICU PATCH: ifdef around UCONFIG_NO_FORMATTING |
| #include "unicode/utypes.h" |
| #if !UCONFIG_NO_FORMATTING |
| |
| #ifndef DOUBLE_CONVERSION_STRING_TO_DOUBLE_H_ |
| #define DOUBLE_CONVERSION_STRING_TO_DOUBLE_H_ |
| |
| // ICU PATCH: Customize header file paths for ICU. |
| |
| #include "double-conversion-utils.h" |
| |
| // ICU PATCH: Wrap in ICU namespace |
| U_NAMESPACE_BEGIN |
| |
| namespace double_conversion { |
| |
| class StringToDoubleConverter { |
| public: |
| // Enumeration for allowing octals and ignoring junk when converting |
| // strings to numbers. |
| enum Flags { |
| NO_FLAGS = 0, |
| ALLOW_HEX = 1, |
| ALLOW_OCTALS = 2, |
| ALLOW_TRAILING_JUNK = 4, |
| ALLOW_LEADING_SPACES = 8, |
| ALLOW_TRAILING_SPACES = 16, |
| ALLOW_SPACES_AFTER_SIGN = 32, |
| ALLOW_CASE_INSENSITIVITY = 64, |
| ALLOW_CASE_INSENSIBILITY = 64, // Deprecated |
| ALLOW_HEX_FLOATS = 128, |
| }; |
| |
| static const uc16 kNoSeparator = '\0'; |
| |
| // Flags should be a bit-or combination of the possible Flags-enum. |
| // - NO_FLAGS: no special flags. |
| // - ALLOW_HEX: recognizes the prefix "0x". Hex numbers may only be integers. |
| // Ex: StringToDouble("0x1234") -> 4660.0 |
| // In StringToDouble("0x1234.56") the characters ".56" are trailing |
| // junk. The result of the call is hence dependent on |
| // the ALLOW_TRAILING_JUNK flag and/or the junk value. |
| // With this flag "0x" is a junk-string. Even with ALLOW_TRAILING_JUNK, |
| // the string will not be parsed as "0" followed by junk. |
| // |
| // - ALLOW_OCTALS: recognizes the prefix "0" for octals: |
| // If a sequence of octal digits starts with '0', then the number is |
| // read as octal integer. Octal numbers may only be integers. |
| // Ex: StringToDouble("01234") -> 668.0 |
| // StringToDouble("012349") -> 12349.0 // Not a sequence of octal |
| // // digits. |
| // In StringToDouble("01234.56") the characters ".56" are trailing |
| // junk. The result of the call is hence dependent on |
| // the ALLOW_TRAILING_JUNK flag and/or the junk value. |
| // In StringToDouble("01234e56") the characters "e56" are trailing |
| // junk, too. |
| // - ALLOW_TRAILING_JUNK: ignore trailing characters that are not part of |
| // a double literal. |
| // - ALLOW_LEADING_SPACES: skip over leading whitespace, including spaces, |
| // new-lines, and tabs. |
| // - ALLOW_TRAILING_SPACES: ignore trailing whitespace. |
| // - ALLOW_SPACES_AFTER_SIGN: ignore whitespace after the sign. |
| // Ex: StringToDouble("- 123.2") -> -123.2. |
| // StringToDouble("+ 123.2") -> 123.2 |
| // - ALLOW_CASE_INSENSITIVITY: ignore case of characters for special values: |
| // infinity and nan. |
| // - ALLOW_HEX_FLOATS: allows hexadecimal float literals. |
| // This *must* start with "0x" and separate the exponent with "p". |
| // Examples: 0x1.2p3 == 9.0 |
| // 0x10.1p0 == 16.0625 |
| // ALLOW_HEX and ALLOW_HEX_FLOATS are indendent. |
| // |
| // empty_string_value is returned when an empty string is given as input. |
| // If ALLOW_LEADING_SPACES or ALLOW_TRAILING_SPACES are set, then a string |
| // containing only spaces is converted to the 'empty_string_value', too. |
| // |
| // junk_string_value is returned when |
| // a) ALLOW_TRAILING_JUNK is not set, and a junk character (a character not |
| // part of a double-literal) is found. |
| // b) ALLOW_TRAILING_JUNK is set, but the string does not start with a |
| // double literal. |
| // |
| // infinity_symbol and nan_symbol are strings that are used to detect |
| // inputs that represent infinity and NaN. They can be null, in which case |
| // they are ignored. |
| // The conversion routine first reads any possible signs. Then it compares the |
| // following character of the input-string with the first character of |
| // the infinity, and nan-symbol. If either matches, the function assumes, that |
| // a match has been found, and expects the following input characters to match |
| // the remaining characters of the special-value symbol. |
| // This means that the following restrictions apply to special-value symbols: |
| // - they must not start with signs ('+', or '-'), |
| // - they must not have the same first character. |
| // - they must not start with digits. |
| // |
| // If the separator character is not kNoSeparator, then that specific |
| // character is ignored when in between two valid digits of the significant. |
| // It is not allowed to appear in the exponent. |
| // It is not allowed to lead or trail the number. |
| // It is not allowed to appear twice next to each other. |
| // |
| // Examples: |
| // flags = ALLOW_HEX | ALLOW_TRAILING_JUNK, |
| // empty_string_value = 0.0, |
| // junk_string_value = NaN, |
| // infinity_symbol = "infinity", |
| // nan_symbol = "nan": |
| // StringToDouble("0x1234") -> 4660.0. |
| // StringToDouble("0x1234K") -> 4660.0. |
| // StringToDouble("") -> 0.0 // empty_string_value. |
| // StringToDouble(" ") -> NaN // junk_string_value. |
| // StringToDouble(" 1") -> NaN // junk_string_value. |
| // StringToDouble("0x") -> NaN // junk_string_value. |
| // StringToDouble("-123.45") -> -123.45. |
| // StringToDouble("--123.45") -> NaN // junk_string_value. |
| // StringToDouble("123e45") -> 123e45. |
| // StringToDouble("123E45") -> 123e45. |
| // StringToDouble("123e+45") -> 123e45. |
| // StringToDouble("123E-45") -> 123e-45. |
| // StringToDouble("123e") -> 123.0 // trailing junk ignored. |
| // StringToDouble("123e-") -> 123.0 // trailing junk ignored. |
| // StringToDouble("+NaN") -> NaN // NaN string literal. |
| // StringToDouble("-infinity") -> -inf. // infinity literal. |
| // StringToDouble("Infinity") -> NaN // junk_string_value. |
| // |
| // flags = ALLOW_OCTAL | ALLOW_LEADING_SPACES, |
| // empty_string_value = 0.0, |
| // junk_string_value = NaN, |
| // infinity_symbol = NULL, |
| // nan_symbol = NULL: |
| // StringToDouble("0x1234") -> NaN // junk_string_value. |
| // StringToDouble("01234") -> 668.0. |
| // StringToDouble("") -> 0.0 // empty_string_value. |
| // StringToDouble(" ") -> 0.0 // empty_string_value. |
| // StringToDouble(" 1") -> 1.0 |
| // StringToDouble("0x") -> NaN // junk_string_value. |
| // StringToDouble("0123e45") -> NaN // junk_string_value. |
| // StringToDouble("01239E45") -> 1239e45. |
| // StringToDouble("-infinity") -> NaN // junk_string_value. |
| // StringToDouble("NaN") -> NaN // junk_string_value. |
| // |
| // flags = NO_FLAGS, |
| // separator = ' ': |
| // StringToDouble("1 2 3 4") -> 1234.0 |
| // StringToDouble("1 2") -> NaN // junk_string_value |
| // StringToDouble("1 000 000.0") -> 1000000.0 |
| // StringToDouble("1.000 000") -> 1.0 |
| // StringToDouble("1.0e1 000") -> NaN // junk_string_value |
| StringToDoubleConverter(int flags, |
| double empty_string_value, |
| double junk_string_value, |
| const char* infinity_symbol, |
| const char* nan_symbol, |
| uc16 separator = kNoSeparator) |
| : flags_(flags), |
| empty_string_value_(empty_string_value), |
| junk_string_value_(junk_string_value), |
| infinity_symbol_(infinity_symbol), |
| nan_symbol_(nan_symbol), |
| separator_(separator) { |
| } |
| |
| // Performs the conversion. |
| // The output parameter 'processed_characters_count' is set to the number |
| // of characters that have been processed to read the number. |
| // Spaces than are processed with ALLOW_{LEADING|TRAILING}_SPACES are included |
| // in the 'processed_characters_count'. Trailing junk is never included. |
| double StringToDouble(const char* buffer, |
| int length, |
| int* processed_characters_count) const; |
| |
| // Same as StringToDouble above but for 16 bit characters. |
| double StringToDouble(const uc16* buffer, |
| int length, |
| int* processed_characters_count) const; |
| |
| // Same as StringToDouble but reads a float. |
| // Note that this is not equivalent to static_cast<float>(StringToDouble(...)) |
| // due to potential double-rounding. |
| float StringToFloat(const char* buffer, |
| int length, |
| int* processed_characters_count) const; |
| |
| // Same as StringToFloat above but for 16 bit characters. |
| float StringToFloat(const uc16* buffer, |
| int length, |
| int* processed_characters_count) const; |
| |
| private: |
| const int flags_; |
| const double empty_string_value_; |
| const double junk_string_value_; |
| const char* const infinity_symbol_; |
| const char* const nan_symbol_; |
| const uc16 separator_; |
| |
| template <class Iterator> |
| double StringToIeee(Iterator start_pointer, |
| int length, |
| bool read_as_double, |
| int* processed_characters_count) const; |
| |
| DOUBLE_CONVERSION_DISALLOW_IMPLICIT_CONSTRUCTORS(StringToDoubleConverter); |
| }; |
| |
| } // namespace double_conversion |
| |
| // ICU PATCH: Close ICU namespace |
| U_NAMESPACE_END |
| |
| #endif // DOUBLE_CONVERSION_STRING_TO_DOUBLE_H_ |
| #endif // ICU PATCH: close #if !UCONFIG_NO_FORMATTING |
