Integer.cpp

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#include <tdme/utilities/Integer.h>
 
#include <string.h>
 
#include <algorithm>
#include <cctype>
#include <charconv>
#include <string>
#include <string_view>
 
#include <tdme/tdme.h>
#include <tdme/utilities/StringTools.h>
 
using tdme::utilities::StringTools;
 
using std::find_if;
using std::from_chars;
using std::isdigit;
using std::stoi;
using std::string;
using std::string_view;
using std::to_string;
 
using tdme::utilities::Integer;
 
bool Integer::is(const string& str) {
    auto trimmedStr = StringTools::trim(str);
    return
        trimmedStr.empty() == false &&
        find_if(
            trimmedStr.begin() + (trimmedStr[0] == '-'?1:0),
            trimmedStr.end(),
            [](unsigned char c) {
                return isdigit(c) == 0;
            }
        ) == trimmedStr.end();
}
 
bool Integer::viewIs(const string_view& str) {
    auto trimmedStr = StringTools::viewTrim(str);
    return
        trimmedStr.empty() == false &&
        find_if(
            trimmedStr.begin() + (trimmedStr[0] == '-'?1:0),
            trimmedStr.end(),
            [](unsigned char c) {
                return isdigit(c) == 0;
            }
        ) == trimmedStr.end();
}
 
int Integer::parse(const string& str) {
    auto trimmedStr = StringTools::trim(str);
    if (trimmedStr.empty() == true) return 0;
    if (trimmedStr == "-") return -0;
    return stoi(trimmedStr);
}
 
int Integer::viewParse(const string_view& str) {
    auto trimmedStr = StringTools::viewTrim(str);
    if (trimmedStr.empty() == true) return 0;
    if (trimmedStr == "-") return -0;
    int result;
    from_chars(&trimmedStr[0], &trimmedStr[trimmedStr.size()], result);
    return result;
}
 
void Integer::encode(const uint32_t decodedInt, string& encodedString) {
    encodedString = "";
    char encodingCharSet[] = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVW-+/*.";
    for (auto i = 0; i < 6; i++) {
        auto charIdx = (decodedInt >> (i * 6)) & 63;
        encodedString = encodingCharSet[charIdx] + encodedString;
    }
}
 
bool Integer::decode(const string& encodedString, uint32_t& decodedInt) {
    char encodingCharSet[] = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVW-+/*.";
    decodedInt = 0;
    for (auto i = 0; i < encodedString.length(); i++) {
        auto codeIdx = -1;
        char c = encodedString[encodedString.length() - i - 1];
        char* codePtr = strchr(encodingCharSet, c);
        if (codePtr == NULL) {
            return false;
        } else {
            codeIdx = codePtr - encodingCharSet;
        }
        decodedInt+= codeIdx << (i * 6);
    }
    return true;
}
 
bool Integer::viewDecode(const string_view& encodedString, uint32_t& decodedInt) {
    char encodingCharSet[] = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVW-+/*.";
    decodedInt = 0;
    for (auto i = 0; i < encodedString.length(); i++) {
        auto codeIdx = -1;
        char c = encodedString[encodedString.length() - i - 1];
        char* codePtr = strchr(encodingCharSet, c);
        if (codePtr == NULL) {
            return false;
        } else {
            codeIdx = codePtr - encodingCharSet;
        }
        decodedInt+= codeIdx << (i * 6);
    }
    return true;
}