StringOp.cc

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#include "StringOp.hh"
#include "MSXException.hh"
#include "ranges.hh"
#include "stl.hh"
#include <cstdlib>
 
using std::string;
using std::string_view;
 
namespace StringOp {
 
bool stringToBool(string_view str)
{
        if (str == "1") return true;
        if ((str.size() == 4) && (strncasecmp(str.data(), "true", 4) == 0))
                return true;
        if ((str.size() == 3) && (strncasecmp(str.data(), "yes", 3) == 0))
                return true;
        return false;
}
 
std::string toLower(std::string_view str)
{
        std::string result(str);
        transform_in_place(result, ::tolower);
        return result;
}
 
void trimRight(string& str, const char* chars)
{
        if (auto pos = str.find_last_not_of(chars); pos != string::npos) {
                str.erase(pos + 1);
        } else {
                str.clear();
        }
}
void trimRight(string& str, char chars)
{
        if (auto pos = str.find_last_not_of(chars); pos != string::npos) {
                str.erase(pos + 1);
        } else {
                str.clear();
        }
}
void trimRight(string_view& str, string_view chars)
{
        while (!str.empty() && (chars.find(str.back()) != string_view::npos)) {
                str.remove_suffix(1);
        }
}
void trimRight(string_view& str, char chars)
{
        while (!str.empty() && (str.back() == chars)) {
                str.remove_suffix(1);
        }
}
 
void trimLeft(string& str, const char* chars)
{
        str.erase(0, str.find_first_not_of(chars));
}
void trimLeft(string& str, char chars)
{
        str.erase(0, str.find_first_not_of(chars));
}
void trimLeft(string_view& str, string_view chars)
{
        while (!str.empty() && (chars.find(str.front()) != string_view::npos)) {
                str.remove_prefix(1);
        }
}
void trimLeft(string_view& str, char chars)
{
        while (!str.empty() && (str.front() == chars)) {
                str.remove_prefix(1);
        }
}
 
void trim(string_view& str, string_view chars)
{
        trimRight(str, chars);
        trimLeft (str, chars);
}
 
void trim(string_view& str, char chars)
{
        trimRight(str, chars);
        trimLeft (str, chars);
}
 
std::pair<string_view, string_view> splitOnFirst(string_view str, string_view chars)
{
        if (auto pos = str.find_first_of(chars); pos == string_view::npos) {
                return {str, string_view{}};
        } else {
                return {str.substr(0, pos), str.substr(pos + 1)};
        }
}
std::pair<string_view, string_view> splitOnFirst(string_view str, char chars)
{
        if (auto pos = str.find_first_of(chars); pos == string_view::npos) {
                return {str, string_view{}};
        } else {
                return {str.substr(0, pos), str.substr(pos + 1)};
        }
}
 
std::pair<string_view, string_view> splitOnLast(string_view str, string_view chars)
{
        if (auto pos = str.find_last_of(chars); pos == string_view::npos) {
                return {string_view{}, str};
        } else {
                return {str.substr(0, pos), str.substr(pos + 1)};
        }
}
std::pair<string_view, string_view> splitOnLast(string_view str, char chars)
{
        if (auto pos = str.find_last_of(chars); pos == string_view::npos) {
                return {string_view{}, str};
        } else {
                return {str.substr(0, pos), str.substr(pos + 1)};
        }
}
 
//std::vector<string_view> split(string_view str, char chars)
//{
//      std::vector<string_view> result;
//      while (!str.empty()) {
//              auto [first, last] = splitOnFirst(str, chars);
//              result.push_back(first);
//              str = last;
//      }
//      return result;
//}
 
static unsigned parseNumber(string_view str)
{
        trim(str, " \t");
        auto r = stringToBase<10, unsigned>(str);
        if (!r) {
                throw openmsx::MSXException("Invalid integer: ", str);
        }
        return *r;
}
 
static void checkRange(unsigned x, unsigned min, unsigned max)
{
        if ((min <= x) && (x <= max)) return;
        throw openmsx::MSXException(
                "Out of range, should be between [, ", min, ", ", max,
                "], but got: ", x);
}
 
static void parseRange2(string_view str, IterableBitSet<64>& result,
                        unsigned min, unsigned max)
{
        // trimRight only: here we only care about all spaces
        trimRight(str, " \t");
        if (str.empty()) return;
 
        if (auto pos = str.find('-'); pos == string_view::npos) {
                auto x = parseNumber(str);
                checkRange(x, min, max);
                result.set(x);
        } else {
                unsigned begin = parseNumber(str.substr(0, pos));
                unsigned end   = parseNumber(str.substr(pos + 1));
                if (end < begin) {
                        std::swap(begin, end);
                }
                checkRange(begin, min, max);
                checkRange(end,   min, max);
                result.setRange(begin, end + 1);
        }
}
 
IterableBitSet<64> parseRange(string_view str, unsigned min, unsigned max)
{
        assert(min <= max);
        assert(max < 64);
 
        IterableBitSet<64> result;
        while (true) {
                auto next = str.find(',');
                string_view sub = (next == string_view::npos)
                               ? str
                               : str.substr(0, next++);
                parseRange2(sub, result, min, max);
                if (next == string_view::npos) break;
                str = str.substr(next);
        }
        return result;
}
 
#if defined(__APPLE__)
 
std::string fromCFString(CFStringRef str)
{
        // Try the quick route first.
        const char *cstr = CFStringGetCStringPtr(str, kCFStringEncodingUTF8);
        if (cstr) {
                // String was already in UTF8 encoding.
                return std::string(cstr);
        }
 
        // Convert to UTF8 encoding.
        CFIndex len = CFStringGetLength(str);
        CFRange range = CFRangeMake(0, len);
        CFIndex usedBufLen = 0;
        CFStringGetBytes(
                str, range, kCFStringEncodingUTF8, '?', false, nullptr, len, &usedBufLen);
        UInt8 buffer[usedBufLen];
        CFStringGetBytes(
                str, range, kCFStringEncodingUTF8, '?', false, buffer, len, &usedBufLen);
        return std::string(reinterpret_cast<const char *>(buffer), usedBufLen);
}
 
#endif
 
} // namespace StringOp