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#include "cru/base/StringToNumberConverter.h"
#include "cru/base/Exception.h"
namespace cru {
bool StringToIntegerConverter::CheckParams() const {
return base == 0 || base >= 2 & base <= 36;
}
static bool IsSpace(char c) {
return c == ' ' || c == '\t' || c == '\n' || c == '\r';
}
StringToIntegerResult StringToIntegerConverter::Parse(
const char* const str, const Index size,
Index* processed_characters_count) const {
if (str == nullptr) throw std::invalid_argument("Invalid str.");
if (size < 0) throw std::invalid_argument("Invalid size.");
if (!CheckParams()) throw std::invalid_argument("Invalid parsing flags.");
const bool throw_on_error = flags.Has(StringToNumberFlags::kThrowOnError);
auto const end = str + size;
auto current = str;
if (flags & StringToNumberFlags::kAllowLeadingSpaces) {
while (current != end && IsSpace(*current)) {
current++;
}
}
if (current == end) {
if (processed_characters_count) {
*processed_characters_count = 0;
}
if (throw_on_error) {
throw Exception(u"Empty string (after reading leading spaces).");
} else {
return {false, 0};
}
}
bool negate = false;
if (*current == '-') {
++current;
negate = true;
} else if (*current == '+') {
++current;
}
if (current == end) {
if (processed_characters_count) {
*processed_characters_count = 0;
}
if (throw_on_error) {
throw Exception(u"Empty string (after reading sign).");
} else {
return {false, 0};
}
}
int real_base = base;
if (real_base == 0) {
if (*current == '0') {
++current;
if (current == end) {
if (processed_characters_count) {
*processed_characters_count = current - str;
}
return {negate, 0};
} else if (*current == 'x' || *current == 'X') {
++current;
real_base = 16;
} else if (*current == 'b' || *current == 'B') {
++current;
real_base = 2;
} else {
real_base = 8;
}
} else {
real_base = 10;
}
}
if (current == end) {
if (processed_characters_count) {
*processed_characters_count = 0;
}
if (throw_on_error) {
throw Exception(u"Empty string (after reading head base indicator).");
} else {
return {false, 0};
}
}
const bool allow_leading_zero =
flags.Has(StringToNumberFlags::kAllowLeadingZeroForInteger);
while (current != end && *current == '0') {
current++;
}
if (current == end) {
if (processed_characters_count) {
*processed_characters_count = current - str;
}
return {negate, 0};
}
const bool allow_trailing_junk =
flags.Has(StringToNumberFlags::kAllowTrailingJunk);
const bool allow_trailing_spaces =
flags.Has(StringToNumberFlags::kAllowTrailingSpaces);
unsigned long long result = 0;
while (current != end) {
const char c = *current;
if (c >= '0' && c <= (real_base > 10 ? '9' : real_base + '0' - 1)) {
result = result * real_base + c - '0';
current++;
} else if (real_base > 10 && c >= 'a' && c <= (real_base + 'a' - 10 - 1)) {
result = result * real_base + c - 'a' + 10;
current++;
} else if (real_base > 10 && c >= 'A' && c <= (real_base + 'A' - 10 - 1)) {
result = result * real_base + c - 'A' + 10;
current++;
} else if (allow_trailing_junk) {
break;
} else if (allow_trailing_spaces && IsSpace(c)) {
break;
} else {
if (processed_characters_count) {
*processed_characters_count = 0;
}
if (throw_on_error) {
throw Exception(String(u"Read invalid character '") + c + u"'.");
} else {
return {false, 0};
}
}
}
if (allow_trailing_spaces) {
while (current != end && IsSpace(*current)) {
current++;
}
if (current != end) {
if (processed_characters_count) {
*processed_characters_count = 0;
}
if (throw_on_error) {
throw Exception(u"There is trailing junk.");
} else {
return {false, 0};
}
}
}
if (processed_characters_count) {
*processed_characters_count = current - str;
}
return {negate, result};
}
} // namespace cru
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