pip/main.cpp

#include "pip.h"
#include "piiostream.h"
#include "pibytearray.h"
#include "pimathbase.h"

using namespace PICoutManipulators;

template <typename T>
T toDecimal(const PIString & s) {
	int part = 0, exp = 0;
	bool negative = false, negative_exp = false, err = false, has_digit = false;
	T ret = 0., frac = 0., frac_delim = 1.;
	for (const PIChar pc: s) {
		char c = pc.toAscii();
		switch (part) {
		case 0: // sign
			if (pc.isSpace()) continue;
			if (c >= '0' && c <= '9') {
				has_digit = true;
				ret = c - '0';
				part = 1;
				continue;
			}
			if (c == '+') {
				part = 1;
				continue;
			}
			if (c == '-') {
				negative = true;
				part = 1;
				continue;
			}
			if (c == '.' || c == ',') {
				part = 2;
				continue;
			}
			err = true;
			break;
		case 1: // integer
			if (c >= '0' && c <= '9') {
				has_digit = true;
				ret = ret * 10 + (c - '0');
				continue;
			}
			if (c == '.' || c == ',') {
				part = 2;
				continue;
			}
			if ((c == 'e' || c == 'E') && has_digit) {
				part = 3;
				continue;
			}
			err = true;
			break;
		case 2: // fractional
			if (c >= '0' && c <= '9') {
				has_digit = true;
				frac = frac * 10 + (c - '0');
				frac_delim *= 10.;
				//piCout << frac << frac_delim;
				//printf("%.20f %.20f\n", frac, T(c - '0') / frac_delim);
				continue;
			}
			if ((c == 'e' || c == 'E') && has_digit) {
				part = 3;
				continue;
			}
			err = true;
			break;
		case 3: // exponent with sign
			if (c == '+') {
				part = 4;
				continue;
			}
			if (c == '-') {
				negative_exp = true;
				part = 4;
				continue;
			}
		case 4: // exponent
			if (c >= '0' && c <= '9') {
				exp = (exp * 10) + (c - '0');
				continue;
			}
			err = true;
			break;
		}
		if (err) break;
	}
	frac /= frac_delim;
	ret += frac;
	if (negative && has_digit) ret = -ret;
	if (exp > 0) {
		if (negative_exp) ret /= pow10((T)exp);
		else ret *= pow10((T)exp);
	}
	return ret;
}

inline void test(const PIString & s) {
	double av = atof(s.dataAscii());
	double v = toDecimal<double>(s);
	printf("\n");
	piCout << s << "=" << v << av;
	printf("atof = %.20f\n", av);
	printf(" PIP = %.20f\n", v);
}

int main(int argc, char * argv[]) {
	/*test(" 123 ");
	test("\n123 ");
	test("\t123 ");
	test(" +123 ");
	test(" ++123 ");
	test(" + 123 ");
	test(" -123 ");
	test(" --123 ");
	test(" - 123 ");
	test("123.1");
	test("123 .1");
	test("123 . 1");
	test("123.+1");
	test("123.-1");
	test("123E2");
	test("123E+2");
	test("123E +2");
	test("123E+ 2");
	test("123E + 2");
	test("123 E+2");
	test("123 E +2");
	test("123 E+ 2");
	test("123 E + 2");
	test("123E+2.5");
	test("123.4E+2");
	test("123.4.5E+2");
	test("123EE+2");
	test("123e+2");
	test("123e++2");
	test("E+2");
	test("1E+2");
	test("1.E+2");
	test(".E+2");
	test(".1E-2");
	test("+E2");
	test("nan");
	test("inf");*/
	test("-");
	test("-0");
	test("-.");
	test("-.0");
	test(".23456123456789987654");
	test("-E+100");

	return 0;

	PITimeMeasurer tm;
	PIString s("1.23456789");
	int cnt = 10000000;
	int el_o = 0, el_n = 0;
	double v = 0.;
	NO_UNUSED(v);

	tm.reset();
	piForTimes (cnt) {
		v = s.toDouble();
	}
	el_o = tm.elapsed_u();
	piCout << v << el_o;

	tm.reset();
	piForTimes (cnt) {
		v = toDecimal<double>(s);
	}
	el_n = tm.elapsed_u();
	piCout << v << el_n;

	piCout << (double)el_o / el_n;
	return 0;
}