mirror of https://github.com/bsnes-emu/bsnes.git
88 lines
2.1 KiB
C++
88 lines
2.1 KiB
C++
#pragma once
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#include <nall/stdint.hpp>
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namespace nall {
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constexpr inline auto binary_(const char* s, uintmax sum = 0) -> uintmax {
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return (
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*s == '0' || *s == '1' ? binary_(s + 1, (sum << 1) | *s - '0') :
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*s == '\'' ? binary_(s + 1, sum) :
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sum
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);
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}
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constexpr inline auto octal_(const char* s, uintmax sum = 0) -> uintmax {
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return (
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*s >= '0' && *s <= '7' ? octal_(s + 1, (sum << 3) | *s - '0') :
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*s == '\'' ? octal_(s + 1, sum) :
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sum
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);
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}
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constexpr inline auto decimal_(const char* s, uintmax sum = 0) -> uintmax {
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return (
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*s >= '0' && *s <= '9' ? decimal_(s + 1, (sum * 10) + *s - '0') :
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*s == '\'' ? decimal_(s + 1, sum) :
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sum
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);
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}
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constexpr inline auto hex_(const char* s, uintmax sum = 0) -> uintmax {
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return (
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*s >= 'A' && *s <= 'F' ? hex_(s + 1, (sum << 4) | *s - 'A' + 10) :
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*s >= 'a' && *s <= 'f' ? hex_(s + 1, (sum << 4) | *s - 'a' + 10) :
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*s >= '0' && *s <= '9' ? hex_(s + 1, (sum << 4) | *s - '0') :
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*s == '\'' ? hex_(s + 1, sum) :
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sum
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);
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}
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//
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constexpr inline auto binary(const char* s) -> uintmax {
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return (
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*s == '0' && (*(s + 1) == 'B' || *(s + 1) == 'b') ? binary_(s + 2) :
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*s == '%' ? binary_(s + 1) : binary_(s)
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);
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}
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constexpr inline auto octal(const char* s) -> uintmax {
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return (
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*s == '0' && (*(s + 1) == 'O' || *(s + 1) == 'o') ? octal_(s + 2) :
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octal_(s)
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);
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}
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constexpr inline auto hex(const char* s) -> uintmax {
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return (
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*s == '0' && (*(s + 1) == 'X' || *(s + 1) == 'x') ? hex_(s + 2) :
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*s == '$' ? hex_(s + 1) : hex_(s)
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);
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}
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//
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constexpr inline auto natural(const char* s) -> uintmax {
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return (
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*s == '0' && (*(s + 1) == 'B' || *(s + 1) == 'b') ? binary_(s + 2) :
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*s == '0' && (*(s + 1) == 'O' || *(s + 1) == 'o') ? octal_(s + 2) :
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*s == '0' && (*(s + 1) == 'X' || *(s + 1) == 'x') ? hex_(s + 2) :
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*s == '%' ? binary_(s + 1) : *s == '$' ? hex_(s + 1) : decimal_(s)
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);
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}
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constexpr inline auto integer(const char* s) -> intmax {
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return (
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*s == '+' ? +natural(s + 1) : *s == '-' ? -natural(s + 1) : natural(s)
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);
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}
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//
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inline auto real(const char* s) -> double {
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return atof(s);
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}
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}
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