mirror of
https://github.com/RPCS3/rpcs3.git
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615 lines
10 KiB
C++
615 lines
10 KiB
C++
#pragma once
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#include "types.h"
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#include <climits>
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#include <string>
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#include <vector>
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#include <algorithm>
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/*
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C-style format parser. Appends formatted string to `out`, returns number of characters written.
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`out`: mutable reference to std::string, std::vector<char> or other compatible container
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`fmt`: null-terminated string of `Char` type (char or constructible from char)
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`src`: rvalue reference to argument provider.
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*/
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template<typename Dst, typename Char, typename Src>
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std::size_t cfmt_append(Dst& out, const Char* fmt, Src&& src)
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{
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const std::size_t start_pos = out.size();
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struct cfmt_context
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{
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std::size_t size; // Size of current format sequence
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u8 args; // Number of extra args used
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u8 type; // Integral type bytesize
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bool dot; // Precision enabled
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bool left;
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bool sign;
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bool space;
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bool alter;
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bool zeros;
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uint width;
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uint prec;
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};
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cfmt_context ctx{0};
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// Error handling: print untouched sequence, stop further formatting
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const auto drop_sequence = [&]
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{
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out.insert(out.end(), fmt - ctx.size, fmt);
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ctx.size = -1;
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};
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const auto read_decimal = [&](uint result) -> uint
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{
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while (fmt[0] >= '0' && fmt[0] <= '9' && result <= (UINT_MAX / 10))
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{
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result = result * 10 + (fmt[0] - '0');
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fmt++, ctx.size++;
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}
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return result;
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};
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const auto write_octal = [&](u64 value, u64 min_num)
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{
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out.resize(out.size() + std::max<u64>(min_num, 66 / 3 - (cntlz64(value | 1, true) + 2) / 3), '0');
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// Write in reversed order
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for (auto i = out.rbegin(); value; i++, value /= 8)
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{
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*i = value % 8 + '0';
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}
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};
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const auto write_hex = [&](u64 value, bool upper, u64 min_num)
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{
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out.resize(out.size() + std::max<u64>(min_num, 64 / 4 - cntlz64(value | 1, true) / 4), '0');
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// Write in reversed order
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for (auto i = out.rbegin(); value; i++, value /= 16)
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{
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*i = (upper ? "0123456789ABCDEF" : "0123456789abcdef")[value % 16];
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}
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};
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const auto write_decimal = [&](u64 value, s64 min_size)
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{
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const std::size_t start = out.size();
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do
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{
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out.push_back(value % 10 + '0');
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value /= 10;
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}
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while (0 < --min_size || value);
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// Revert written characters
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for (std::size_t i = start, j = out.size() - 1; i < j; i++, j--)
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{
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std::swap(out[i], out[j]);
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}
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};
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// Single pass over fmt string (null-terminated), TODO: check correct order
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while (const Char ch = *fmt++) if (ctx.size == 0)
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{
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if (ch == '%')
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{
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ctx.size = 1;
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}
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else
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{
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out.push_back(ch);
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}
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}
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else if (ctx.size == 1 && ch == '%')
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{
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ctx = {0};
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out.push_back(ch);
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}
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else if (ctx.size == -1)
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{
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out.push_back(ch);
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}
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else switch (ctx.size++, ch)
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{
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case '-': ctx.left = true; break;
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case '+': ctx.sign = true; break;
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case ' ': ctx.space = true; break;
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case '#': ctx.alter = true; break;
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case '0': ctx.zeros = true; break;
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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{
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if (UNLIKELY(ctx.width))
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{
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drop_sequence();
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}
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else
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{
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ctx.width = read_decimal(ch - '0');
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}
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break;
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}
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case '*':
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{
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if (UNLIKELY(ctx.width || !src.test(ctx.args)))
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{
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drop_sequence();
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}
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else
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{
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const int warg = src.template get<int>(ctx.args++);
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ctx.width = std::abs(warg);
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ctx.left |= warg < 0;
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}
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break;
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}
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case '.':
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{
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if (UNLIKELY(ctx.dot || ctx.prec))
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{
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drop_sequence();
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}
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else if (*fmt >= '0' && *fmt <= '9') // TODO: does it allow '0'?
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{
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ctx.prec = read_decimal(0);
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ctx.dot = true;
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}
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else if (*fmt == '*')
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{
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if (UNLIKELY(!src.test(ctx.args)))
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{
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drop_sequence();
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}
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else
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{
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fmt++, ctx.size++;
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const int parg = src.template get<int>(ctx.args++);
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ctx.prec = std::max(parg, 0);
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ctx.dot = parg >= 0;
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}
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}
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else
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{
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ctx.prec = 0;
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ctx.dot = true;
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}
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break;
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}
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case 'h':
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{
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if (UNLIKELY(ctx.type))
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{
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drop_sequence();
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}
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else if (fmt[0] == 'h')
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{
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fmt++, ctx.size++;
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ctx.type = sizeof(char);
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}
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else
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{
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ctx.type = sizeof(short);
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}
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break;
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}
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case 'l':
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{
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if (UNLIKELY(ctx.type))
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{
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drop_sequence();
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}
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else if (fmt[0] == 'l')
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{
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fmt++, ctx.size++;
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ctx.type = sizeof(llong);
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}
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else
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{
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ctx.type = sizeof(long);
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}
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break;
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}
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case 'z':
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{
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if (UNLIKELY(ctx.type))
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{
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drop_sequence();
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}
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else
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{
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ctx.type = sizeof(std::size_t);
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}
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break;
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}
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case 'j':
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{
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if (UNLIKELY(ctx.type))
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{
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drop_sequence();
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}
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else
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{
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ctx.type = sizeof(std::intmax_t);
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}
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break;
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}
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case 't':
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{
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if (UNLIKELY(ctx.type))
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{
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drop_sequence();
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}
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else
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{
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ctx.type = sizeof(std::ptrdiff_t);
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}
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break;
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}
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case 'c':
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{
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if (UNLIKELY(ctx.type || !src.test(ctx.args)))
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{
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drop_sequence();
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break;
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}
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const std::size_t start = out.size();
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out.push_back(src.template get<Char>(ctx.args));
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if (1 < ctx.width)
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{
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// Add spaces if necessary
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out.insert(out.begin() + start + ctx.left, ctx.width - 1, ' ');
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}
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src.skip(ctx.args);
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ctx = {0};
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break;
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}
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case 's':
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{
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if (UNLIKELY(ctx.type || !src.test(ctx.args)))
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{
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drop_sequence();
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break;
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}
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const std::size_t start = out.size();
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const std::size_t size1 = src.fmt_string(out, ctx.args);
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if (ctx.dot && size1 > ctx.prec)
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{
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// Shrink if necessary
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out.resize(start + ctx.prec);
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}
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const std::size_t size2 = out.size() - start;
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if (size2 < ctx.width)
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{
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// Add spaces if necessary
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out.insert(ctx.left ? out.end() : out.begin() + start, ctx.width - size2, ' ');
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}
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src.skip(ctx.args);
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ctx = {0};
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break;
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}
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case 'd':
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case 'i':
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{
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if (UNLIKELY(!src.test(ctx.args)))
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{
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drop_sequence();
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break;
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}
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if (!ctx.type)
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{
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ctx.type = (u8)src.type(ctx.args);
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}
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// Sign-extended argument expected
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const u64 val = src.template get<u64>(ctx.args);
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const bool negative = ctx.type && static_cast<s64>(val) < 0;
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const std::size_t start = out.size();
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if (!ctx.dot || ctx.prec)
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{
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if (negative)
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{
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out.push_back('-');
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}
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else if (ctx.sign)
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{
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out.push_back('+');
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}
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else if (ctx.space)
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{
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out.push_back(' ');
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}
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write_decimal(negative ? 0 - val : val, ctx.prec);
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}
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const std::size_t size2 = out.size() - start;
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if (size2 < ctx.width)
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{
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// Add padding if necessary
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if (ctx.zeros && !ctx.left && !ctx.dot)
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{
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out.insert(out.begin() + start + (negative || ctx.sign || ctx.space), ctx.width - size2, '0');
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}
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else
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{
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out.insert(ctx.left ? out.end() : out.begin() + start, ctx.width - size2, ' ');
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}
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}
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src.skip(ctx.args);
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ctx = {0};
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break;
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}
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case 'o':
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{
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if (UNLIKELY(!src.test(ctx.args)))
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{
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drop_sequence();
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break;
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}
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if (!ctx.type)
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{
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ctx.type = (u8)src.type(ctx.args);
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}
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const u64 mask =
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ctx.type == 1 ? 0xffull :
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ctx.type == 2 ? 0xffffull :
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ctx.type == 4 ? 0xffffffffull : 0xffffffffffffffffull;
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// Trunc sign-extended signed types
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const u64 val = src.template get<u64>(ctx.args) & mask;
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const std::size_t start = out.size();
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if (ctx.alter)
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{
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out.push_back('0');
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if (val)
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{
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write_octal(val, ctx.prec ? ctx.prec - 1 : 0);
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}
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}
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else if (!ctx.dot || ctx.prec)
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{
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write_octal(val, ctx.prec);
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}
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const std::size_t size2 = out.size() - start;
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if (size2 < ctx.width)
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{
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// Add padding if necessary
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out.insert(ctx.left ? out.end() : out.begin() + start, ctx.width - size2, ctx.zeros && !ctx.left && !ctx.dot ? '0' : ' ');
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}
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src.skip(ctx.args);
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ctx = {0};
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break;
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}
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case 'x':
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case 'X':
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{
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if (UNLIKELY(!src.test(ctx.args)))
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{
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drop_sequence();
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break;
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}
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if (!ctx.type)
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{
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ctx.type = (u8)src.type(ctx.args);
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}
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const u64 mask =
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ctx.type == 1 ? 0xffull :
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ctx.type == 2 ? 0xffffull :
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ctx.type == 4 ? 0xffffffffull : 0xffffffffffffffffull;
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// Trunc sign-extended signed types
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const u64 val = src.template get<u64>(ctx.args) & mask;
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const std::size_t start = out.size();
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if (ctx.alter)
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{
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out.push_back('0');
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if (val)
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{
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out.push_back(ch); // Prepend 0x or 0X
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write_hex(val, ch == 'X', ctx.prec);
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}
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}
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else if (!ctx.dot || ctx.prec)
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{
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write_hex(val, ch == 'X', ctx.prec);
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}
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const std::size_t size2 = out.size() - start;
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if (size2 < ctx.width)
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{
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// Add padding if necessary
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if (ctx.zeros && !ctx.left && !ctx.dot)
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{
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out.insert(out.begin() + start + (ctx.alter && val ? 2 : 0), ctx.width - size2, '0');
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}
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else
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{
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out.insert(ctx.left ? out.end() : out.begin() + start, ctx.width - size2, ' ');
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}
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}
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src.skip(ctx.args);
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ctx = {0};
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break;
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}
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case 'u':
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{
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if (UNLIKELY(!src.test(ctx.args)))
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{
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drop_sequence();
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break;
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}
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if (!ctx.type)
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{
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ctx.type = (u8)src.type(ctx.args);
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}
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const u64 mask =
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ctx.type == 1 ? 0xffull :
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ctx.type == 2 ? 0xffffull :
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ctx.type == 4 ? 0xffffffffull : 0xffffffffffffffffull;
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// Trunc sign-extended signed types
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const u64 val = src.template get<u64>(ctx.args) & mask;
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const std::size_t start = out.size();
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if (!ctx.dot || ctx.prec)
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{
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write_decimal(val, ctx.prec);
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}
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const std::size_t size2 = out.size() - start;
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if (size2 < ctx.width)
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{
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// Add padding if necessary
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out.insert(ctx.left ? out.end() : out.begin() + start, ctx.width - size2, ctx.zeros && !ctx.left && !ctx.dot ? '0' : ' ');
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}
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src.skip(ctx.args);
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ctx = {0};
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break;
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}
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case 'p':
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{
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if (UNLIKELY(!src.test(ctx.args) || ctx.type))
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{
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drop_sequence();
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break;
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}
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const u64 val = src.template get<u64>(ctx.args);
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const std::size_t start = out.size();
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write_hex(val, false, sizeof(void*) * 2);
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const std::size_t size2 = out.size() - start;
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if (size2 < ctx.width)
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{
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// Add padding if necessary
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out.insert(ctx.left ? out.end() : out.begin() + start, ctx.width - size2, ' ');
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}
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src.skip(ctx.args);
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ctx = {0};
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break;
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}
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case 'f':
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case 'F':
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case 'e':
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case 'E':
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case 'a':
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case 'A':
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case 'g':
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case 'G':
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{
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if (UNLIKELY(!src.test(ctx.args) || ctx.type))
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{
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drop_sequence();
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break;
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}
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// Fallback (TODO)
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const std::string _fmt(fmt - ctx.size, fmt);
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const f64 arg0 = src.template get<f64>(0);
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const u64 arg1 = ctx.args >= 1 ? src.template get<u64>(1) : 0;
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const u64 arg2 = ctx.args >= 2 ? src.template get<u64>(2) : 0;
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if (const std::size_t _size = std::snprintf(0, 0, _fmt.c_str(), arg0, arg1, arg2))
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{
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out.resize(out.size() + _size);
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std::snprintf(&out.front() + out.size() - _size, _size + 1, _fmt.c_str(), arg0, arg1, arg2);
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}
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src.skip(ctx.args);
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ctx = {0};
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break;
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}
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case 'L': // long double, not supported
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case 'n': // writeback, not supported
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default:
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{
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drop_sequence();
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}
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}
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// Handle unfinished sequence
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if (ctx.size && ctx.size != -1)
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{
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fmt--, drop_sequence();
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}
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return out.size() - start_pos;
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}
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