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305 lines
9.1 KiB
C++
305 lines
9.1 KiB
C++
#ifndef MISC_STRINGOPS_H
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#define MISC_STRINGOPS_H
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#include <cctype>
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#include <string>
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#include <algorithm>
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#include "utf8stream.hpp"
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namespace Misc
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{
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class StringUtils
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{
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struct ci
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{
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bool operator()(char x, char y) const {
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return toLower(x) < toLower(y);
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}
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};
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// Allow to convert complex arguments to C-style strings for format() function
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template <typename T>
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static T argument(T value) noexcept
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{
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return value;
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}
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template <typename T>
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static T const * argument(std::basic_string<T> const & value) noexcept
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{
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return value.c_str();
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}
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public:
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/// Plain and simple locale-unaware toLower. Anything from A to Z is lower-cased, multibyte characters are unchanged.
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/// Don't use std::tolower(char, locale&) because that is abysmally slow.
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/// Don't use tolower(int) because that depends on global locale.
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static char toLower(char c)
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{
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return (c >= 'A' && c <= 'Z') ? c + 'a' - 'A' : c;
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}
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static Utf8Stream::UnicodeChar toLowerUtf8(Utf8Stream::UnicodeChar ch)
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{
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// Russian alphabet
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if (ch >= 0x0410 && ch < 0x0430)
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return ch + 0x20;
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// Cyrillic IO character
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if (ch == 0x0401)
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return ch + 0x50;
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// Latin alphabet
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if (ch >= 0x41 && ch < 0x60)
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return ch + 0x20;
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// Deutch characters
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if (ch == 0xc4 || ch == 0xd6 || ch == 0xdc)
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return ch + 0x20;
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if (ch == 0x1e9e)
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return 0xdf;
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// TODO: probably we will need to support characters from other languages
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return ch;
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}
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static std::string lowerCaseUtf8(const std::string& str)
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{
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if (str.empty())
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return str;
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// Decode string as utf8 characters, convert to lower case and pack them to string
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std::string out;
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Utf8Stream stream (str.c_str());
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while (!stream.eof ())
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{
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Utf8Stream::UnicodeChar character = toLowerUtf8(stream.peek());
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if (character <= 0x7f)
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out.append(1, static_cast<char>(character));
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else if (character <= 0x7ff)
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{
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out.append(1, static_cast<char>(0xc0 | ((character >> 6) & 0x1f)));
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out.append(1, static_cast<char>(0x80 | (character & 0x3f)));
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}
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else if (character <= 0xffff)
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{
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out.append(1, static_cast<char>(0xe0 | ((character >> 12) & 0x0f)));
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out.append(1, static_cast<char>(0x80 | ((character >> 6) & 0x3f)));
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out.append(1, static_cast<char>(0x80 | (character & 0x3f)));
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}
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else
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{
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out.append(1, static_cast<char>(0xf0 | ((character >> 18) & 0x07)));
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out.append(1, static_cast<char>(0x80 | ((character >> 12) & 0x3f)));
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out.append(1, static_cast<char>(0x80 | ((character >> 6) & 0x3f)));
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out.append(1, static_cast<char>(0x80 | (character & 0x3f)));
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}
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stream.consume();
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}
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return out;
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}
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static bool ciLess(const std::string &x, const std::string &y) {
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return std::lexicographical_compare(x.begin(), x.end(), y.begin(), y.end(), ci());
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}
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static bool ciEqual(const std::string &x, const std::string &y) {
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if (x.size() != y.size()) {
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return false;
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}
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std::string::const_iterator xit = x.begin();
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std::string::const_iterator yit = y.begin();
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for (; xit != x.end(); ++xit, ++yit) {
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if (toLower(*xit) != toLower(*yit)) {
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return false;
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}
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}
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return true;
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}
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static int ciCompareLen(const std::string &x, const std::string &y, size_t len)
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{
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std::string::const_iterator xit = x.begin();
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std::string::const_iterator yit = y.begin();
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for(;xit != x.end() && yit != y.end() && len > 0;++xit,++yit,--len)
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{
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char left = *xit;
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char right = *yit;
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if (left == right)
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continue;
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left = toLower(left);
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right = toLower(right);
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int res = left - right;
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if(res != 0)
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return (res > 0) ? 1 : -1;
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}
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if(len > 0)
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{
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if(xit != x.end())
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return 1;
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if(yit != y.end())
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return -1;
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}
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return 0;
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}
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/// Transforms input string to lower case w/o copy
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static void lowerCaseInPlace(std::string &inout) {
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for (unsigned int i=0; i<inout.size(); ++i)
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inout[i] = toLower(inout[i]);
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}
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/// Returns lower case copy of input string
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static std::string lowerCase(const std::string &in)
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{
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std::string out = in;
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lowerCaseInPlace(out);
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return out;
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}
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struct CiComp
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{
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bool operator()(const std::string& left, const std::string& right) const
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{
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return ciLess(left, right);
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}
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};
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/// Performs a binary search on a sorted container for a string that 'key' starts with
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template<typename Iterator, typename T>
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static Iterator partialBinarySearch(Iterator begin, Iterator end, const T& key)
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{
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const Iterator notFound = end;
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while(begin < end)
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{
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const Iterator middle = begin + (std::distance(begin, end) / 2);
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int comp = Misc::StringUtils::ciCompareLen((*middle), key, (*middle).size());
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if(comp == 0)
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return middle;
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else if(comp > 0)
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end = middle;
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else
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begin = middle + 1;
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}
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return notFound;
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}
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/** @brief Replaces all occurrences of a string in another string.
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*
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* @param str The string to operate on.
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* @param what The string to replace.
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* @param with The replacement string.
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* @param whatLen The length of the string to replace.
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* @param withLen The length of the replacement string.
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*
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* @return A reference to the string passed in @p str.
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*/
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static std::string &replaceAll(std::string &str, const char *what, const char *with,
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std::size_t whatLen=std::string::npos, std::size_t withLen=std::string::npos)
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{
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if (whatLen == std::string::npos)
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whatLen = strlen(what);
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if (withLen == std::string::npos)
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withLen = strlen(with);
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std::size_t found;
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std::size_t offset = 0;
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while((found = str.find(what, offset, whatLen)) != std::string::npos)
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{
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str.replace(found, whatLen, with, withLen);
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offset = found + withLen;
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}
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return str;
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}
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// Requires some C++11 features:
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// 1. std::string needs to be contiguous
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// 2. std::snprintf with zero size (second argument) returns an output string size
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// 3. variadic templates support
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template <typename ... Args>
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static std::string format(const char* fmt, Args const & ... args)
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{
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auto size = std::snprintf(nullptr, 0, fmt, argument(args) ...);
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// Note: sprintf also writes a trailing null character. We should remove it.
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std::string ret(size+1, '\0');
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std::sprintf(&ret[0], fmt, argument(args) ...);
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ret.erase(size);
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return ret;
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}
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template <typename ... Args>
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static std::string format(const std::string& fmt, Args const & ... args)
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{
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return format(fmt.c_str(), args ...);
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}
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static inline void trim(std::string &s)
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{
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// left trim
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s.erase(s.begin(), std::find_if(s.begin(), s.end(), [](int ch)
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{
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return !std::isspace(ch);
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}));
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// right trim
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s.erase(std::find_if(s.rbegin(), s.rend(), [](int ch)
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{
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return !std::isspace(ch);
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}).base(), s.end());
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}
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template <class Container>
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static inline void split(const std::string& str, Container& cont, const std::string& delims = " ")
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{
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std::size_t current, previous = 0;
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current = str.find_first_of(delims);
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while (current != std::string::npos)
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{
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cont.push_back(str.substr(previous, current - previous));
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previous = current + 1;
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current = str.find_first_of(delims, previous);
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}
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cont.push_back(str.substr(previous, current - previous));
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}
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// TODO: use the std::string_view once we will use the C++17.
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// It should allow us to avoid data copying while we still will support both string and literal arguments.
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static inline void replaceAll(std::string& data, const std::string& toSearch, const std::string& replaceStr)
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{
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size_t pos = data.find(toSearch);
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while( pos != std::string::npos)
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{
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data.replace(pos, toSearch.size(), replaceStr);
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pos = data.find(toSearch, pos + replaceStr.size());
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}
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}
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static inline void replaceLast(std::string& str, const std::string& substr, const std::string& with)
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{
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size_t pos = str.rfind(substr);
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if (pos == std::string::npos)
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return;
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str.replace(pos, substr.size(), with);
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}
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};
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}
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#endif
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