245 lines
11 KiB
C++
245 lines
11 KiB
C++
// © 2018 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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//
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// From the double-conversion library. Original license:
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//
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// Copyright 2012 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// ICU PATCH: ifdef around UCONFIG_NO_FORMATTING
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_FORMATTING
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#ifndef DOUBLE_CONVERSION_STRING_TO_DOUBLE_H_
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#define DOUBLE_CONVERSION_STRING_TO_DOUBLE_H_
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// ICU PATCH: Customize header file paths for ICU.
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#include "double-conversion-utils.h"
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// ICU PATCH: Wrap in ICU namespace
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U_NAMESPACE_BEGIN
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namespace double_conversion {
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class StringToDoubleConverter {
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public:
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// Enumeration for allowing octals and ignoring junk when converting
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// strings to numbers.
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enum Flags {
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NO_FLAGS = 0,
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ALLOW_HEX = 1,
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ALLOW_OCTALS = 2,
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ALLOW_TRAILING_JUNK = 4,
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ALLOW_LEADING_SPACES = 8,
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ALLOW_TRAILING_SPACES = 16,
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ALLOW_SPACES_AFTER_SIGN = 32,
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ALLOW_CASE_INSENSITIVITY = 64,
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ALLOW_CASE_INSENSIBILITY = 64, // Deprecated
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ALLOW_HEX_FLOATS = 128,
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};
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static const uc16 kNoSeparator = '\0';
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// Flags should be a bit-or combination of the possible Flags-enum.
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// - NO_FLAGS: no special flags.
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// - ALLOW_HEX: recognizes the prefix "0x". Hex numbers may only be integers.
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// Ex: StringToDouble("0x1234") -> 4660.0
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// In StringToDouble("0x1234.56") the characters ".56" are trailing
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// junk. The result of the call is hence dependent on
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// the ALLOW_TRAILING_JUNK flag and/or the junk value.
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// With this flag "0x" is a junk-string. Even with ALLOW_TRAILING_JUNK,
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// the string will not be parsed as "0" followed by junk.
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//
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// - ALLOW_OCTALS: recognizes the prefix "0" for octals:
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// If a sequence of octal digits starts with '0', then the number is
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// read as octal integer. Octal numbers may only be integers.
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// Ex: StringToDouble("01234") -> 668.0
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// StringToDouble("012349") -> 12349.0 // Not a sequence of octal
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// // digits.
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// In StringToDouble("01234.56") the characters ".56" are trailing
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// junk. The result of the call is hence dependent on
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// the ALLOW_TRAILING_JUNK flag and/or the junk value.
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// In StringToDouble("01234e56") the characters "e56" are trailing
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// junk, too.
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// - ALLOW_TRAILING_JUNK: ignore trailing characters that are not part of
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// a double literal.
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// - ALLOW_LEADING_SPACES: skip over leading whitespace, including spaces,
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// new-lines, and tabs.
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// - ALLOW_TRAILING_SPACES: ignore trailing whitespace.
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// - ALLOW_SPACES_AFTER_SIGN: ignore whitespace after the sign.
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// Ex: StringToDouble("- 123.2") -> -123.2.
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// StringToDouble("+ 123.2") -> 123.2
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// - ALLOW_CASE_INSENSITIVITY: ignore case of characters for special values:
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// infinity and nan.
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// - ALLOW_HEX_FLOATS: allows hexadecimal float literals.
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// This *must* start with "0x" and separate the exponent with "p".
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// Examples: 0x1.2p3 == 9.0
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// 0x10.1p0 == 16.0625
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// ALLOW_HEX and ALLOW_HEX_FLOATS are indendent.
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//
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// empty_string_value is returned when an empty string is given as input.
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// If ALLOW_LEADING_SPACES or ALLOW_TRAILING_SPACES are set, then a string
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// containing only spaces is converted to the 'empty_string_value', too.
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//
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// junk_string_value is returned when
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// a) ALLOW_TRAILING_JUNK is not set, and a junk character (a character not
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// part of a double-literal) is found.
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// b) ALLOW_TRAILING_JUNK is set, but the string does not start with a
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// double literal.
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//
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// infinity_symbol and nan_symbol are strings that are used to detect
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// inputs that represent infinity and NaN. They can be null, in which case
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// they are ignored.
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// The conversion routine first reads any possible signs. Then it compares the
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// following character of the input-string with the first character of
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// the infinity, and nan-symbol. If either matches, the function assumes, that
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// a match has been found, and expects the following input characters to match
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// the remaining characters of the special-value symbol.
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// This means that the following restrictions apply to special-value symbols:
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// - they must not start with signs ('+', or '-'),
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// - they must not have the same first character.
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// - they must not start with digits.
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//
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// If the separator character is not kNoSeparator, then that specific
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// character is ignored when in between two valid digits of the significant.
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// It is not allowed to appear in the exponent.
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// It is not allowed to lead or trail the number.
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// It is not allowed to appear twice next to each other.
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//
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// Examples:
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// flags = ALLOW_HEX | ALLOW_TRAILING_JUNK,
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// empty_string_value = 0.0,
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// junk_string_value = NaN,
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// infinity_symbol = "infinity",
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// nan_symbol = "nan":
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// StringToDouble("0x1234") -> 4660.0.
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// StringToDouble("0x1234K") -> 4660.0.
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// StringToDouble("") -> 0.0 // empty_string_value.
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// StringToDouble(" ") -> NaN // junk_string_value.
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// StringToDouble(" 1") -> NaN // junk_string_value.
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// StringToDouble("0x") -> NaN // junk_string_value.
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// StringToDouble("-123.45") -> -123.45.
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// StringToDouble("--123.45") -> NaN // junk_string_value.
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// StringToDouble("123e45") -> 123e45.
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// StringToDouble("123E45") -> 123e45.
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// StringToDouble("123e+45") -> 123e45.
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// StringToDouble("123E-45") -> 123e-45.
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// StringToDouble("123e") -> 123.0 // trailing junk ignored.
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// StringToDouble("123e-") -> 123.0 // trailing junk ignored.
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// StringToDouble("+NaN") -> NaN // NaN string literal.
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// StringToDouble("-infinity") -> -inf. // infinity literal.
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// StringToDouble("Infinity") -> NaN // junk_string_value.
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//
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// flags = ALLOW_OCTAL | ALLOW_LEADING_SPACES,
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// empty_string_value = 0.0,
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// junk_string_value = NaN,
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// infinity_symbol = NULL,
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// nan_symbol = NULL:
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// StringToDouble("0x1234") -> NaN // junk_string_value.
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// StringToDouble("01234") -> 668.0.
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// StringToDouble("") -> 0.0 // empty_string_value.
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// StringToDouble(" ") -> 0.0 // empty_string_value.
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// StringToDouble(" 1") -> 1.0
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// StringToDouble("0x") -> NaN // junk_string_value.
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// StringToDouble("0123e45") -> NaN // junk_string_value.
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// StringToDouble("01239E45") -> 1239e45.
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// StringToDouble("-infinity") -> NaN // junk_string_value.
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// StringToDouble("NaN") -> NaN // junk_string_value.
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//
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// flags = NO_FLAGS,
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// separator = ' ':
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// StringToDouble("1 2 3 4") -> 1234.0
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// StringToDouble("1 2") -> NaN // junk_string_value
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// StringToDouble("1 000 000.0") -> 1000000.0
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// StringToDouble("1.000 000") -> 1.0
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// StringToDouble("1.0e1 000") -> NaN // junk_string_value
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StringToDoubleConverter(int flags,
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double empty_string_value,
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double junk_string_value,
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const char* infinity_symbol,
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const char* nan_symbol,
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uc16 separator = kNoSeparator)
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: flags_(flags),
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empty_string_value_(empty_string_value),
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junk_string_value_(junk_string_value),
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infinity_symbol_(infinity_symbol),
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nan_symbol_(nan_symbol),
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separator_(separator) {
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}
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// Performs the conversion.
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// The output parameter 'processed_characters_count' is set to the number
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// of characters that have been processed to read the number.
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// Spaces than are processed with ALLOW_{LEADING|TRAILING}_SPACES are included
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// in the 'processed_characters_count'. Trailing junk is never included.
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double StringToDouble(const char* buffer,
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int length,
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int* processed_characters_count) const;
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// Same as StringToDouble above but for 16 bit characters.
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double StringToDouble(const uc16* buffer,
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int length,
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int* processed_characters_count) const;
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// Same as StringToDouble but reads a float.
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// Note that this is not equivalent to static_cast<float>(StringToDouble(...))
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// due to potential double-rounding.
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float StringToFloat(const char* buffer,
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int length,
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int* processed_characters_count) const;
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// Same as StringToFloat above but for 16 bit characters.
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float StringToFloat(const uc16* buffer,
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int length,
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int* processed_characters_count) const;
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private:
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const int flags_;
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const double empty_string_value_;
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const double junk_string_value_;
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const char* const infinity_symbol_;
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const char* const nan_symbol_;
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const uc16 separator_;
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template <class Iterator>
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double StringToIeee(Iterator start_pointer,
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int length,
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bool read_as_double,
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int* processed_characters_count) const;
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DOUBLE_CONVERSION_DISALLOW_IMPLICIT_CONSTRUCTORS(StringToDoubleConverter);
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};
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} // namespace double_conversion
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// ICU PATCH: Close ICU namespace
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U_NAMESPACE_END
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#endif // DOUBLE_CONVERSION_STRING_TO_DOUBLE_H_
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#endif // ICU PATCH: close #if !UCONFIG_NO_FORMATTING
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