Float.cpp

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#include <tdme/utilities/Float.h>
 
#include <algorithm>
#include <cctype>
#include <cstring>
#include <string>
#include <string_view>
 
#include <tdme/tdme.h>
#include <tdme/utilities/Console.h>
#include <tdme/utilities/StringTools.h>
 
using std::find_if;
using std::isdigit;
using std::isnan;
using std::stof;
using std::string;
using std::string_view;
using std::to_string;
 
using tdme::utilities::Float;
 
using tdme::utilities::Console;
using tdme::utilities::StringTools;
 
bool Float::is(const string& str) {
    auto trimmedStr = StringTools::trim(str);
    int dotCount = 0;
    return
        str.empty() == false &&
        find_if(
            trimmedStr.begin() + (trimmedStr[0] == '-'?1:0),
            trimmedStr.end(),
            [&dotCount](unsigned char c) {
                return isdigit(c) == 0 && (c != '.' || ++dotCount > 1);
        }) == trimmedStr.end();
}
 
bool Float::viewIs(const string_view& str) {
    auto trimmedStr = StringTools::viewTrim(str);
    int dotCount = 0;
    return
        str.empty() == false &&
        find_if(
            trimmedStr.begin() + (trimmedStr[0] == '-'?1:0),
            trimmedStr.end(),
            [&dotCount](unsigned char c) {
                return isdigit(c) == 0 && (c != '.' || ++dotCount > 1);
            }
        ) == trimmedStr.end();
}
 
float Float::parse(const string& str) {
    auto trimmedStr = StringTools::trim(str);
    if (trimmedStr.empty() == true) return 0.0f;
    if (trimmedStr == "-") return -0.0f;
    auto dotCount = 0;
    auto digitSum = 0;
    return
        (str.empty() == false &&
        find_if(
            trimmedStr.begin() + (trimmedStr[0] == '-'?1:0),
            trimmedStr.end(),
            [&dotCount, &digitSum](unsigned char c) {
                if (isdigit(c) != 0) digitSum+= c - '0'; return isdigit(c) == 0 && (c != '.' || ++dotCount > 1);
            }
        ) == trimmedStr.end()) == true && digitSum > 0?stof(trimmedStr):0.0f;
}
 
float Float::viewParse(const string_view& str) {
    auto trimmedStr = StringTools::viewTrim(str);
    if (trimmedStr.empty() == true) return 0.0f;
    if (trimmedStr == "-") return -0.0f;
    // TODO: we need to do this this way as long there is no from_chars with float
    if (str.size() > 32) {
        Console::println("Float::viewParse(): str.size() > 32, returning 0.0f");
        return 0.0f;
    }
    char buf[33];
    memcpy(buf, &trimmedStr[0], trimmedStr.size());
    buf[str.size()] = 0;
    return atof(buf);
}