254 lines
6.2 KiB
C++
254 lines
6.2 KiB
C++
#pragma once
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#include <BAN/Move.h>
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#include <stdint.h>
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#include <stddef.h>
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namespace BAN::Formatter
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{
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struct ValueFormat;
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template<typename F, typename... Args>
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concept PrintableArguments = requires(F putc, Args&&... args, const ValueFormat& format)
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{
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(print_argument(putc, BAN::forward<Args>(args), format), ...);
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};
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template<typename F, typename T>
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inline void print_argument(F putc, T value, const ValueFormat& format);
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namespace detail
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{
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template<typename F, typename T>
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inline size_t parse_format_and_print_argument(F putc, const char* format, T&& arg);
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}
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/*
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IMPLEMENTATION
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*/
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struct ValueFormat
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{
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int base = 10;
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int percision = 3;
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int fill = 0;
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char fill_char = '0';
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bool upper = false;
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};
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template<typename F>
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inline void print(F putc, const char* format)
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{
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while (*format)
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{
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putc(*format);
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format++;
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}
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}
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template<typename F, typename Arg, typename... Args> requires PrintableArguments<F, Arg, Args...>
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inline void print(F putc, const char* format, Arg&& arg, Args&&... args)
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{
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while (*format && *format != '{')
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{
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putc(*format);
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format++;
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}
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if (*format == '{')
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{
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size_t arg_len = detail::parse_format_and_print_argument(putc, format, forward<Arg>(arg));
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if (arg_len == size_t(-1))
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return print(putc, format);
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print(putc, format + arg_len, forward<Args>(args)...);
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}
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}
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template<typename F, typename... Args>
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inline void println(F putc, const char* format, Args&&... args)
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{
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print(putc, format, args...);
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putc('\n');
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}
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namespace detail
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{
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template<typename F, typename Arg>
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inline size_t parse_format_and_print_argument(F putc, const char* format, Arg&& argument)
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{
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ValueFormat value_format;
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if (format[0] != '{')
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return size_t(-1);
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size_t i = 1;
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do
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{
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if (!format[i] || format[i] == '}')
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break;
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if (format[i] == ' ')
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{
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value_format.fill_char = ' ';
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i++;
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}
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if ('0' <= format[i] && format[i] <= '9')
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{
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int fill = 0;
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while ('0' <= format[i] && format[i] <= '9')
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{
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fill = (fill * 10) + (format[i] - '0');
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i++;
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}
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value_format.fill = fill;
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}
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switch (format[i])
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{
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case 'b': value_format.base = 2; value_format.upper = false; i++; break;
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case 'B': value_format.base = 2; value_format.upper = true; i++; break;
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case 'o': value_format.base = 8; value_format.upper = false; i++; break;
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case 'O': value_format.base = 8; value_format.upper = true; i++; break;
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case 'd': value_format.base = 10; value_format.upper = false; i++; break;
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case 'D': value_format.base = 10; value_format.upper = true; i++; break;
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case 'h': value_format.base = 16; value_format.upper = false; i++; break;
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case 'H': value_format.base = 16; value_format.upper = true; i++; break;
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default: break;
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}
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if (!format[i] || format[i] == '}')
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break;
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if (format[i] == '.')
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{
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i++;
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int percision = 0;
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while ('0' <= format[i] && format[i] <= '9')
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{
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percision = (percision * 10) + (format[i] - '0');
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i++;
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}
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value_format.percision = percision;
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}
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} while(false);
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if (format[i] != '}')
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return size_t(-1);
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print_argument(putc, forward<Arg>(argument), value_format);
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return i + 1;
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}
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inline char value_to_base_char(uint8_t value, int base, bool upper)
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{
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if (base <= 10)
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return value + '0';
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if (base <= 36)
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{
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if (value < 10)
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return value + '0';
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return value + (upper ? 'A' : 'a') - 10;
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}
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return '?';
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}
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template<typename F, typename T>
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inline void print_integer(F putc, T value, const ValueFormat& format)
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{
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if (value == 0)
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{
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for (int i = 0; i < format.fill - 1; i++)
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putc(format.fill_char);
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putc('0');
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return;
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}
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bool sign = false;
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// Fits signed 64-bit binary number and null
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char buffer[66];
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char* ptr = buffer + sizeof(buffer);
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*(--ptr) = '\0';
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if (value < 0)
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{
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sign = true;
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T digit = (format.base - (value % format.base)) % format.base;
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*(--ptr) = value_to_base_char(digit, format.base, format.upper);
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value = -(value / format.base);
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}
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while (value)
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{
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*(--ptr) = value_to_base_char(value % format.base, format.base, format.upper);
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value /= format.base;
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}
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while (ptr >= buffer + sizeof(buffer) - format.fill)
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*(--ptr) = format.fill_char;
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if (sign)
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*(--ptr) = '-';
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print(putc, ptr);
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}
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template<typename F, typename T>
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inline void print_floating(F putc, T value, const ValueFormat& format)
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{
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int64_t int_part = (int64_t)value;
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T frac_part = value - (T)int_part;
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if (frac_part < 0)
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frac_part = -frac_part;
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print_integer(putc, int_part, format);
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if (format.percision > 0)
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putc('.');
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for (int i = 0; i < format.percision; i++)
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{
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frac_part *= format.base;
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if (i == format.percision - 1)
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frac_part += 0.5;
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putc(value_to_base_char((uint8_t)frac_part % format.base, format.base, format.upper));
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}
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}
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template<typename F>
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inline void print_pointer(F putc, void* ptr, const ValueFormat& format)
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{
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uintptr_t value = (uintptr_t)ptr;
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print(putc, "0x");
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for (int i = sizeof(void*) * 8 - 4; i >= 0; i -= 4)
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putc(value_to_base_char((value >> i) & 0xF, 16, format.upper));
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}
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}
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/*
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TEMPLATE SPECIALIZATIONS
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*/
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template<typename F, integral T> inline void print_argument(F putc, T value, const ValueFormat& format) { detail::print_integer(putc, value, format); }
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template<typename F, floating_point T> inline void print_argument(F putc, T value, const ValueFormat& format) { detail::print_floating(putc, value, format); }
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template<typename F, pointer T> inline void print_argument(F putc, T value, const ValueFormat& format) { detail::print_pointer(putc, (void*)value, format); }
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template<typename F> inline void print_argument(F putc, char value, const ValueFormat&) { putc(value); }
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template<typename F> inline void print_argument(F putc, bool value, const ValueFormat&) { print(putc, value ? "true" : "false"); }
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template<typename F> inline void print_argument(F putc, const char* value, const ValueFormat&) { print(putc, value); }
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template<typename F> inline void print_argument(F putc, char* value, const ValueFormat&) { print(putc, value); }
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}
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