201 lines
8.6 KiB
C++
201 lines
8.6 KiB
C++
// Copyright 2017 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "absl/strings/ascii.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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namespace ascii_internal {
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// # Table generated by this Python code (bit 0x02 is currently unused):
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// TODO(mbar) Move Python code for generation of table to BUILD and link here.
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// NOTE: The kAsciiPropertyBits table used within this code was generated by
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// Python code of the following form. (Bit 0x02 is currently unused and
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// available.)
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//
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// def Hex2(n):
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// return '0x' + hex(n/16)[2:] + hex(n%16)[2:]
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// def IsPunct(ch):
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// return (ord(ch) >= 32 and ord(ch) < 127 and
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// not ch.isspace() and not ch.isalnum())
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// def IsBlank(ch):
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// return ch in ' \t'
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// def IsCntrl(ch):
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// return ord(ch) < 32 or ord(ch) == 127
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// def IsXDigit(ch):
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// return ch.isdigit() or ch.lower() in 'abcdef'
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// for i in range(128):
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// ch = chr(i)
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// mask = ((ch.isalpha() and 0x01 or 0) |
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// (ch.isalnum() and 0x04 or 0) |
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// (ch.isspace() and 0x08 or 0) |
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// (IsPunct(ch) and 0x10 or 0) |
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// (IsBlank(ch) and 0x20 or 0) |
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// (IsCntrl(ch) and 0x40 or 0) |
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// (IsXDigit(ch) and 0x80 or 0))
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// print Hex2(mask) + ',',
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// if i % 16 == 7:
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// print ' //', Hex2(i & 0x78)
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// elif i % 16 == 15:
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// print
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// clang-format off
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// Array of bitfields holding character information. Each bit value corresponds
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// to a particular character feature. For readability, and because the value
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// of these bits is tightly coupled to this implementation, the individual bits
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// are not named. Note that bitfields for all characters above ASCII 127 are
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// zero-initialized.
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ABSL_DLL const unsigned char kPropertyBits[256] = {
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0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, // 0x00
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0x40, 0x68, 0x48, 0x48, 0x48, 0x48, 0x40, 0x40,
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0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, // 0x10
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0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,
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0x28, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, // 0x20
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0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
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0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, // 0x30
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0x84, 0x84, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
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0x10, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x05, // 0x40
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0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
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0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, // 0x50
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0x05, 0x05, 0x05, 0x10, 0x10, 0x10, 0x10, 0x10,
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0x10, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x05, // 0x60
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0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
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0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, // 0x70
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0x05, 0x05, 0x05, 0x10, 0x10, 0x10, 0x10, 0x40,
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};
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// Array of characters for the ascii_tolower() function. For values 'A'
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// through 'Z', return the lower-case character; otherwise, return the
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// identity of the passed character.
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ABSL_DLL const char kToLower[256] = {
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'\x00', '\x01', '\x02', '\x03', '\x04', '\x05', '\x06', '\x07',
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'\x08', '\x09', '\x0a', '\x0b', '\x0c', '\x0d', '\x0e', '\x0f',
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'\x10', '\x11', '\x12', '\x13', '\x14', '\x15', '\x16', '\x17',
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'\x18', '\x19', '\x1a', '\x1b', '\x1c', '\x1d', '\x1e', '\x1f',
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'\x20', '\x21', '\x22', '\x23', '\x24', '\x25', '\x26', '\x27',
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'\x28', '\x29', '\x2a', '\x2b', '\x2c', '\x2d', '\x2e', '\x2f',
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'\x30', '\x31', '\x32', '\x33', '\x34', '\x35', '\x36', '\x37',
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'\x38', '\x39', '\x3a', '\x3b', '\x3c', '\x3d', '\x3e', '\x3f',
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'\x40', 'a', 'b', 'c', 'd', 'e', 'f', 'g',
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'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
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'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
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'x', 'y', 'z', '\x5b', '\x5c', '\x5d', '\x5e', '\x5f',
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'\x60', '\x61', '\x62', '\x63', '\x64', '\x65', '\x66', '\x67',
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'\x68', '\x69', '\x6a', '\x6b', '\x6c', '\x6d', '\x6e', '\x6f',
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'\x70', '\x71', '\x72', '\x73', '\x74', '\x75', '\x76', '\x77',
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'\x78', '\x79', '\x7a', '\x7b', '\x7c', '\x7d', '\x7e', '\x7f',
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'\x80', '\x81', '\x82', '\x83', '\x84', '\x85', '\x86', '\x87',
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'\x88', '\x89', '\x8a', '\x8b', '\x8c', '\x8d', '\x8e', '\x8f',
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'\x90', '\x91', '\x92', '\x93', '\x94', '\x95', '\x96', '\x97',
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'\x98', '\x99', '\x9a', '\x9b', '\x9c', '\x9d', '\x9e', '\x9f',
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'\xa0', '\xa1', '\xa2', '\xa3', '\xa4', '\xa5', '\xa6', '\xa7',
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'\xa8', '\xa9', '\xaa', '\xab', '\xac', '\xad', '\xae', '\xaf',
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'\xb0', '\xb1', '\xb2', '\xb3', '\xb4', '\xb5', '\xb6', '\xb7',
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'\xb8', '\xb9', '\xba', '\xbb', '\xbc', '\xbd', '\xbe', '\xbf',
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'\xc0', '\xc1', '\xc2', '\xc3', '\xc4', '\xc5', '\xc6', '\xc7',
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'\xc8', '\xc9', '\xca', '\xcb', '\xcc', '\xcd', '\xce', '\xcf',
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'\xd0', '\xd1', '\xd2', '\xd3', '\xd4', '\xd5', '\xd6', '\xd7',
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'\xd8', '\xd9', '\xda', '\xdb', '\xdc', '\xdd', '\xde', '\xdf',
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'\xe0', '\xe1', '\xe2', '\xe3', '\xe4', '\xe5', '\xe6', '\xe7',
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'\xe8', '\xe9', '\xea', '\xeb', '\xec', '\xed', '\xee', '\xef',
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'\xf0', '\xf1', '\xf2', '\xf3', '\xf4', '\xf5', '\xf6', '\xf7',
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'\xf8', '\xf9', '\xfa', '\xfb', '\xfc', '\xfd', '\xfe', '\xff',
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};
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// Array of characters for the ascii_toupper() function. For values 'a'
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// through 'z', return the upper-case character; otherwise, return the
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// identity of the passed character.
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ABSL_DLL const char kToUpper[256] = {
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'\x00', '\x01', '\x02', '\x03', '\x04', '\x05', '\x06', '\x07',
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'\x08', '\x09', '\x0a', '\x0b', '\x0c', '\x0d', '\x0e', '\x0f',
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'\x10', '\x11', '\x12', '\x13', '\x14', '\x15', '\x16', '\x17',
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'\x18', '\x19', '\x1a', '\x1b', '\x1c', '\x1d', '\x1e', '\x1f',
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'\x20', '\x21', '\x22', '\x23', '\x24', '\x25', '\x26', '\x27',
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'\x28', '\x29', '\x2a', '\x2b', '\x2c', '\x2d', '\x2e', '\x2f',
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'\x30', '\x31', '\x32', '\x33', '\x34', '\x35', '\x36', '\x37',
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'\x38', '\x39', '\x3a', '\x3b', '\x3c', '\x3d', '\x3e', '\x3f',
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'\x40', '\x41', '\x42', '\x43', '\x44', '\x45', '\x46', '\x47',
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'\x48', '\x49', '\x4a', '\x4b', '\x4c', '\x4d', '\x4e', '\x4f',
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'\x50', '\x51', '\x52', '\x53', '\x54', '\x55', '\x56', '\x57',
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'\x58', '\x59', '\x5a', '\x5b', '\x5c', '\x5d', '\x5e', '\x5f',
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'\x60', 'A', 'B', 'C', 'D', 'E', 'F', 'G',
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'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
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'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
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'X', 'Y', 'Z', '\x7b', '\x7c', '\x7d', '\x7e', '\x7f',
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'\x80', '\x81', '\x82', '\x83', '\x84', '\x85', '\x86', '\x87',
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'\x88', '\x89', '\x8a', '\x8b', '\x8c', '\x8d', '\x8e', '\x8f',
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'\x90', '\x91', '\x92', '\x93', '\x94', '\x95', '\x96', '\x97',
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'\x98', '\x99', '\x9a', '\x9b', '\x9c', '\x9d', '\x9e', '\x9f',
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'\xa0', '\xa1', '\xa2', '\xa3', '\xa4', '\xa5', '\xa6', '\xa7',
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'\xa8', '\xa9', '\xaa', '\xab', '\xac', '\xad', '\xae', '\xaf',
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'\xb0', '\xb1', '\xb2', '\xb3', '\xb4', '\xb5', '\xb6', '\xb7',
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'\xb8', '\xb9', '\xba', '\xbb', '\xbc', '\xbd', '\xbe', '\xbf',
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'\xc0', '\xc1', '\xc2', '\xc3', '\xc4', '\xc5', '\xc6', '\xc7',
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'\xc8', '\xc9', '\xca', '\xcb', '\xcc', '\xcd', '\xce', '\xcf',
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'\xd0', '\xd1', '\xd2', '\xd3', '\xd4', '\xd5', '\xd6', '\xd7',
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'\xd8', '\xd9', '\xda', '\xdb', '\xdc', '\xdd', '\xde', '\xdf',
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'\xe0', '\xe1', '\xe2', '\xe3', '\xe4', '\xe5', '\xe6', '\xe7',
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'\xe8', '\xe9', '\xea', '\xeb', '\xec', '\xed', '\xee', '\xef',
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'\xf0', '\xf1', '\xf2', '\xf3', '\xf4', '\xf5', '\xf6', '\xf7',
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'\xf8', '\xf9', '\xfa', '\xfb', '\xfc', '\xfd', '\xfe', '\xff',
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};
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// clang-format on
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} // namespace ascii_internal
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void AsciiStrToLower(std::string* s) {
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for (auto& ch : *s) {
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ch = absl::ascii_tolower(ch);
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}
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}
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void AsciiStrToUpper(std::string* s) {
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for (auto& ch : *s) {
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ch = absl::ascii_toupper(ch);
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}
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}
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void RemoveExtraAsciiWhitespace(std::string* str) {
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auto stripped = StripAsciiWhitespace(*str);
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if (stripped.empty()) {
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str->clear();
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return;
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}
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auto input_it = stripped.begin();
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auto input_end = stripped.end();
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auto output_it = &(*str)[0];
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bool is_ws = false;
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for (; input_it < input_end; ++input_it) {
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if (is_ws) {
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// Consecutive whitespace? Keep only the last.
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is_ws = absl::ascii_isspace(*input_it);
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if (is_ws) --output_it;
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} else {
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is_ws = absl::ascii_isspace(*input_it);
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}
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*output_it = *input_it;
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++output_it;
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}
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str->erase(output_it - &(*str)[0]);
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}
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ABSL_NAMESPACE_END
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} // namespace absl
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