901 lines
29 KiB
C++
901 lines
29 KiB
C++
/* Format strings for OctaSTD. Inspired by D's std.format module.
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*
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* This file is part of OctaSTD. See COPYING.md for futher information.
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*/
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#ifndef OSTD_FORMAT_HH
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#define OSTD_FORMAT_HH
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <assert.h>
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#include "ostd/algorithm.hh"
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#include "ostd/string.hh"
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#include "ostd/utility.hh"
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#include "ostd/internal/tuple.hh"
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namespace ostd {
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enum FormatFlags {
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FMT_FLAG_DASH = 1 << 0,
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FMT_FLAG_ZERO = 1 << 1,
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FMT_FLAG_SPACE = 1 << 2,
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FMT_FLAG_PLUS = 1 << 3,
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FMT_FLAG_HASH = 1 << 4
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};
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namespace detail {
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inline int parse_fmt_flags(ConstCharRange &fmt, int ret) {
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while (!fmt.empty()) {
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switch (fmt.front()) {
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case '-': ret |= FMT_FLAG_DASH; fmt.pop_front(); break;
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case '+': ret |= FMT_FLAG_PLUS; fmt.pop_front(); break;
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case '#': ret |= FMT_FLAG_HASH; fmt.pop_front(); break;
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case '0': ret |= FMT_FLAG_ZERO; fmt.pop_front(); break;
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case ' ': ret |= FMT_FLAG_SPACE; fmt.pop_front(); break;
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default: goto retflags;
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}
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}
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retflags:
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return ret;
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}
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inline Size read_digits(ConstCharRange &fmt, char *buf) {
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Size ret = 0;
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for (; !fmt.empty() && isdigit(fmt.front()); ++ret) {
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*buf++ = fmt.front();
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fmt.pop_front();
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}
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*buf = '\0';
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return ret;
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}
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/* 0 .. not allowed
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* 1 .. floating point
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* 2 .. character
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* 3 .. binary
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* 4 .. octal
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* 5 .. decimal
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* 6 .. hexadecimal
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* 7 .. string
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* 8 .. custom object
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*/
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static constexpr const byte fmt_specs[] = {
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/* uppercase spec set */
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1, 3, 8, 8, /* A B C D */
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1, 1, 1, 8, /* E F G H */
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8, 8, 8, 8, /* I J K L */
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8, 8, 8, 8, /* M N O P */
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8, 8, 8, 8, /* Q R S T */
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8, 8, 8, 6, /* U V W X */
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8, 8, /* Y Z */
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/* ascii filler */
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0, 0, 0, 0, 0, 0,
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/* lowercase spec set */
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1, 3, 2, 5, /* a b c d */
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1, 1, 1, 8, /* e f g h */
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8, 8, 8, 8, /* i j k l */
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8, 8, 4, 8, /* m n o p */
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8, 8, 7, 8, /* q r s t */
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8, 8, 8, 6, /* u v w x */
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8, 8, /* y z */
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/* ascii filler */
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0, 0, 0, 0, 0
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};
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static constexpr const int fmt_bases[] = {
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0, 0, 0, 2, 8, 10, 16, 0
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};
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static constexpr const char fmt_digits[2][16] = {
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{
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'0', '1', '2', '3', '4', '5', '6', '7',
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'8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
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},
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{
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'0', '1', '2', '3', '4', '5', '6', '7',
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'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
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}
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};
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static constexpr const char *fmt_intpfx[2][4] = {
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{ "0B", "0", "", "0X" },
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{ "0b", "0", "", "0x" }
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};
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/* retrieve width/precision */
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template<typename T>
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bool convert_arg_param(const T &val, int ¶m, EnableIf<
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IsIntegral<T>, bool
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> = true) {
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param = int(val);
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return true;
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}
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template<typename T>
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bool convert_arg_param(const T &, int &, EnableIf<
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!IsIntegral<T>, bool
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> = true) {
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assert(false && "invalid argument for width/precision");
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return false;
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}
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template<typename T>
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bool get_arg_param(Size idx, int ¶m, const T &val) {
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if (idx) {
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assert(false && "not enough format args");
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return false;
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}
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return convert_arg_param(val, param);
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}
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template<typename T, typename ...A>
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bool get_arg_param(Size idx, int ¶m, const T &val,
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const A &...args) {
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if (idx) return get_arg_param(idx - 1, param, args...);
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return convert_arg_param(val, param);
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}
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}
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struct FormatSpec {
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FormatSpec(): p_nested_escape(false), p_fmt() {}
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FormatSpec(ConstCharRange fmt, bool escape = false):
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p_nested_escape(escape), p_fmt(fmt) {}
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template<typename R>
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bool read_until_spec(R &writer, Size *wret) {
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Size written = 0;
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if (wret) *wret = 0;
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if (p_fmt.empty()) return false;
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while (!p_fmt.empty()) {
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if (p_fmt.front() == '%') {
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p_fmt.pop_front();
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if (p_fmt.front() == '%') goto plain;
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bool r = read_spec();
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if (wret) *wret = written;
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return r;
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}
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plain:
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++written;
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writer.put(p_fmt.front());
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p_fmt.pop_front();
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}
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if (wret) *wret = written;
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return false;
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}
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template<typename R>
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Size write_spaces(R &writer, Size n, bool left, char c = ' ') const {
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if (left == bool(p_flags & FMT_FLAG_DASH)) return 0;
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int r = p_width - int(n);
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for (int w = p_width - int(n); --w >= 0; writer.put(c));
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if (r < 0) return 0;
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return r;
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}
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ConstCharRange rest() const {
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return p_fmt;
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}
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template<typename R>
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Size build_spec(R &&out, ConstCharRange spec) {
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Size ret = out.put('%');
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if (p_flags & FMT_FLAG_DASH ) ret += out.put('-');
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if (p_flags & FMT_FLAG_ZERO ) ret += out.put('0');
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if (p_flags & FMT_FLAG_SPACE) ret += out.put(' ');
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if (p_flags & FMT_FLAG_PLUS ) ret += out.put('+');
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if (p_flags & FMT_FLAG_HASH ) ret += out.put('#');
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ret += out.put_n("*.*", 3);
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ret += out.put_n(&spec[0], spec.size());
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return ret;
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}
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int width() const { return p_width; }
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int precision() const { return p_precision; }
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bool has_width() const { return p_has_width; }
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bool has_precision() const { return p_has_precision; }
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bool arg_width() const { return p_arg_width; }
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bool arg_precision() const { return p_arg_precision; }
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template<typename ...A>
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bool set_width(Size idx, const A &...args) {
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return detail::get_arg_param(idx, p_width, args...);
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}
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template<typename ...A>
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bool set_precision(Size idx, const A &...args) {
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return detail::get_arg_param(idx, p_precision, args...);
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}
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int flags() const { return p_flags; }
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char spec() const { return p_spec; }
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byte index() const { return p_index; }
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ConstCharRange nested() const { return p_nested; }
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ConstCharRange nested_sep() const { return p_nested_sep; }
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bool is_nested() const { return p_is_nested; }
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bool nested_escape() const { return p_nested_escape; }
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protected:
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ConstCharRange p_nested;
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ConstCharRange p_nested_sep;
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int p_flags = 0;
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int p_width = 0;
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int p_precision = 0;
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bool p_has_width = false;
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bool p_has_precision = false;
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bool p_arg_width = false;
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bool p_arg_precision = false;
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char p_spec = '\0';
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byte p_index = 0;
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bool p_is_nested = false;
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bool p_nested_escape = false;
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bool read_until_dummy() {
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while (!p_fmt.empty()) {
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if (p_fmt.front() == '%') {
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p_fmt.pop_front();
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if (p_fmt.front() == '%') goto plain;
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return read_spec();
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}
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plain:
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p_fmt.pop_front();
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}
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return false;
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}
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bool read_spec_range() {
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int sflags = p_flags;
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p_nested_escape = !(sflags & FMT_FLAG_DASH);
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p_fmt.pop_front();
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ConstCharRange begin_inner(p_fmt);
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if (!read_until_dummy()) {
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p_is_nested = false;
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return false;
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}
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/* skip to the last spec in case multiple specs are present */
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ConstCharRange curfmt(p_fmt);
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while (read_until_dummy()) {
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curfmt = p_fmt;
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}
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p_fmt = curfmt;
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p_flags = sflags;
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/* find delimiter or ending */
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ConstCharRange begin_delim(p_fmt);
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ConstCharRange p = find(begin_delim, '%');
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for (; !p.empty(); p = find(p, '%')) {
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p.pop_front();
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/* escape, skip */
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if (p.front() == '%') {
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p.pop_front();
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continue;
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}
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/* found end, in that case delimiter is after spec */
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if (p.front() == ')') {
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p_nested = begin_inner.slice(0, &begin_delim[0] - &begin_inner[0]);
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p_nested_sep = begin_delim.slice(0, &p[0] - &begin_delim[0] - 1);
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p.pop_front();
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p_fmt = p;
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p_is_nested = true;
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return true;
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}
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/* found actual delimiter start... */
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if (p.front() == '|') {
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p_nested = begin_inner.slice(0, &p[0] - &begin_inner[0] - 1);
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p.pop_front();
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p_nested_sep = p;
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for (p = find(p, '%'); !p.empty(); p = find(p, '%')) {
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p.pop_front();
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if (p.front() == ')') {
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p_nested_sep = p_nested_sep.slice(0, &p[0] - &p_nested_sep[0] - 1);
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p.pop_front();
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p_fmt = p;
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p_is_nested = true;
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return true;
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}
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}
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p_is_nested = false;
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return false;
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}
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}
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p_is_nested = false;
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return false;
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}
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bool read_spec() {
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Size ndig = detail::read_digits(p_fmt, p_buf);
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bool havepos = false;
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p_index = 0;
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/* parse index */
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if (p_fmt.front() == '$') {
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if (ndig <= 0) return false; /* no pos given */
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int idx = atoi(p_buf);
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if (idx <= 0 || idx > 255) return false; /* bad index */
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p_index = byte(idx);
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p_fmt.pop_front();
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havepos = true;
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}
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/* parse flags */
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p_flags = 0;
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Size skipd = 0;
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if (havepos || !ndig) {
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p_flags = detail::parse_fmt_flags(p_fmt, 0);
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} else {
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for (Size i = 0; i < ndig; ++i) {
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if (p_buf[i] != '0') break;
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++skipd;
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}
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if (skipd) p_flags = FMT_FLAG_ZERO;
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if (skipd == ndig)
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p_flags = detail::parse_fmt_flags(p_fmt, p_flags);
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}
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/* range/array formatting */
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if ((p_fmt.front() == '(') && (havepos || !(ndig - skipd))) {
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return read_spec_range();
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}
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/* parse width */
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p_width = 0;
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p_has_width = false;
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p_arg_width = false;
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if (!havepos && ndig && (ndig - skipd)) {
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p_width = atoi(p_buf + skipd);
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p_has_width = true;
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} else if (detail::read_digits(p_fmt, p_buf)) {
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p_width = atoi(p_buf);
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p_has_width = true;
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} else if (p_fmt.front() == '*') {
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p_arg_width = p_has_width = true;
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p_fmt.pop_front();
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}
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/* parse precision */
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p_precision = 0;
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p_has_precision = false;
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p_arg_precision = false;
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if (p_fmt.front() != '.') goto fmtchar;
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p_fmt.pop_front();
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if (detail::read_digits(p_fmt, p_buf)) {
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p_precision = atoi(p_buf);
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p_has_precision = true;
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} else if (p_fmt.front() == '*') {
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p_arg_precision = p_has_precision = true;
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p_fmt.pop_front();
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} else return false;
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fmtchar:
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p_spec = p_fmt.front();
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p_fmt.pop_front();
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/* make sure we're testing on a signed byte - our mapping only
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* tests values up to 127 */
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sbyte sp = p_spec;
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return (sp >= 65) && (detail::fmt_specs[sp - 65] != 0);
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}
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ConstCharRange p_fmt;
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char p_buf[32];
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};
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/* for custom container formatting */
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template<typename T, typename R, typename = EnableIf<
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IsSame<decltype(declval<const T &>()
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.to_format(declval<R &>(), declval<const FormatSpec &>())), bool
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>
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>> inline bool to_format(const T &v, R &writer, const FormatSpec &fs) {
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return v.to_format(writer, fs);
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}
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namespace detail {
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template<typename R, typename T>
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inline Ptrdiff write_u(R &writer, const FormatSpec *fl, bool neg, T val) {
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char buf[20];
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Ptrdiff r = 0;
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Size n = 0;
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char spec = fl->spec();
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if (spec == 's') spec = 'd';
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byte specn = detail::fmt_specs[spec - 65];
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if (specn <= 2 || specn > 7) {
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assert(false && "cannot format integers with the given spec");
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return -1;
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}
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int base = detail::fmt_bases[specn];
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if (!val) buf[n++] = '0';
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for (; val; val /= base)
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buf[n++] = detail::fmt_digits[spec >= 'a'][val % base];
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r = n;
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int flags = fl->flags();
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bool lsgn = flags & FMT_FLAG_PLUS;
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bool lsp = flags & FMT_FLAG_SPACE;
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bool zero = flags & FMT_FLAG_ZERO;
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bool sign = neg + lsgn + lsp;
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r += sign;
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const char *pfx = nullptr;
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int pfxlen = 0;
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if (flags & FMT_FLAG_HASH && spec != 'd') {
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pfx = detail::fmt_intpfx[spec >= 'a'][specn - 3];
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pfxlen = !!pfx[1] + 1;
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r += pfxlen;
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}
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if (!zero)
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r += fl->write_spaces(writer, n + pfxlen + sign, true, ' ');
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if (sign) writer.put(neg ? '-' : *((" \0+") + lsgn * 2));
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writer.put_n(pfx, pfxlen);
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if (zero)
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r += fl->write_spaces(writer, n + pfxlen + sign, true, '0');
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for (int i = int(n - 1); i >= 0; --i) {
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writer.put(buf[i]);
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}
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r += fl->write_spaces(writer, n + sign + pfxlen, false);
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return r;
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}
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template<typename R, typename ...A>
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static Ptrdiff format_impl(R &writer, Size &fmtn, bool escape,
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ConstCharRange fmt, const A &...args);
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template<typename T, typename = RangeOf<T>>
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static True test_fmt_range(int);
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template<typename>
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static False test_fmt_range(...);
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template<typename T>
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constexpr bool FmtRangeTest = decltype(test_fmt_range<T>(0))::value;
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template<Size I>
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struct FmtTupleUnpacker {
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template<typename R, typename T, typename ...A>
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static inline Ptrdiff unpack(R &writer, Size &fmtn, bool esc,
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ConstCharRange fmt, const T &item,
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const A &...args) {
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return FmtTupleUnpacker<I - 1>::unpack(writer, fmtn, esc, fmt,
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item, get<I - 1>(item), args...);
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}
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};
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template<>
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struct FmtTupleUnpacker<0> {
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template<typename R, typename T, typename ...A>
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static inline Ptrdiff unpack(R &writer, Size &fmtn, bool esc,
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ConstCharRange fmt, const T &,
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const A &...args) {
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return format_impl(writer, fmtn, esc, fmt, args...);
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}
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};
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template<typename R, typename T>
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inline Ptrdiff format_ritem(R &writer, Size &fmtn, bool esc, bool,
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ConstCharRange fmt, const T &item,
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EnableIf<!IsTupleLike<T>, bool>
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= true) {
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return format_impl(writer, fmtn, esc, fmt, item);
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}
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template<typename R, typename T>
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inline Ptrdiff format_ritem(R &writer, Size &fmtn, bool esc,
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bool expandval, ConstCharRange fmt,
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const T &item,
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EnableIf<IsTupleLike<T>, bool>
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= true) {
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if (expandval) {
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return FmtTupleUnpacker<TupleSize<T>>::unpack(writer,
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fmtn, esc, fmt, item);
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}
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return format_impl(writer, fmtn, esc, fmt, item);
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}
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template<typename R, typename T>
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inline Ptrdiff write_range(R &writer, const FormatSpec *fl,
|
|
bool escape, bool expandval,
|
|
ConstCharRange sep,
|
|
const T &val,
|
|
EnableIf<FmtRangeTest<T>, bool>
|
|
= true) {
|
|
auto range = ostd::iter(val);
|
|
if (range.empty()) return 0;
|
|
Ptrdiff ret = 0;
|
|
Size fmtn = 0;
|
|
/* test first item */
|
|
Ptrdiff fret = format_ritem(writer, fmtn, escape, expandval,
|
|
fl->rest(), range.front());
|
|
if (fret < 0) return fret;
|
|
ret += fret;
|
|
range.pop_front();
|
|
/* write the rest (if any) */
|
|
for (; !range.empty(); range.pop_front()) {
|
|
auto v = writer.put_n(&sep[0], sep.size());
|
|
if (v != sep.size())
|
|
return -1;
|
|
ret += sep.size();
|
|
fret = format_ritem(writer, fmtn, escape, expandval,
|
|
fl->rest(), range.front());
|
|
if (fret < 0) return fret;
|
|
ret += fret;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
template<typename R, typename T>
|
|
inline Ptrdiff write_range(R &, const FormatSpec *, bool, bool,
|
|
ConstCharRange, const T &,
|
|
EnableIf<!FmtRangeTest<T>, bool>
|
|
= true) {
|
|
assert(false && "invalid value for ranged format");
|
|
return -1;
|
|
}
|
|
|
|
template<typename T>
|
|
static True test_fmt_tostr(decltype(ostd::to_string(declval<T>())) *);
|
|
template<typename> static False test_fmt_tostr(...);
|
|
|
|
template<typename T>
|
|
constexpr bool FmtTostrTest = decltype(test_fmt_tostr<T>(0))::value;
|
|
|
|
/* non-printable escapes up to 0x20 (space) */
|
|
static constexpr const char *fmt_escapes[] = {
|
|
"\\0" , "\\x01", "\\x02", "\\x03", "\\x04", "\\x05",
|
|
"\\x06", "\\a" , "\\b" , "\\t" , "\\n" , "\\v" ,
|
|
"\\f" , "\\r" , "\\x0E", "\\x0F", "\\x10", "\\x11",
|
|
"\\x12", "\\x13", "\\x14", "\\x15", "\\x16", "\\x17",
|
|
"\\x18", "\\x19", "\\x1A", "\\x1B", "\\x1C", "\\x1D",
|
|
"\\x1E", "\\x1F",
|
|
/* we want to escape double quotes... */
|
|
nullptr, nullptr, "\\\"", nullptr, nullptr, nullptr,
|
|
nullptr, "\\\'"
|
|
};
|
|
|
|
inline const char *escape_fmt_char(char v, char quote) {
|
|
if ((v >= 0 && v < 0x20) || (v == quote)) {
|
|
return fmt_escapes[Size(v)];
|
|
} else if (v == 0x7F) {
|
|
return "\\x7F";
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
inline String escape_fmt_str(ConstCharRange val) {
|
|
String ret;
|
|
ret.push('"');
|
|
while (!val.empty()) {
|
|
const char *esc = escape_fmt_char(val.front(), '"');
|
|
if (esc)
|
|
ret.append(esc);
|
|
else
|
|
ret.push(val.front());
|
|
val.pop_front();
|
|
}
|
|
ret.push('"');
|
|
return ret;
|
|
}
|
|
|
|
template<typename T, typename R>
|
|
static True test_tofmt(decltype(to_format(declval<const T &>(),
|
|
declval<R &>(),
|
|
declval<const FormatSpec &>())) *);
|
|
|
|
template<typename, typename>
|
|
static False test_tofmt(...);
|
|
|
|
template<typename T, typename R>
|
|
constexpr bool FmtTofmtTest = decltype(test_tofmt<T, R>(0))::value;
|
|
|
|
struct WriteSpec: FormatSpec {
|
|
WriteSpec(): FormatSpec() {}
|
|
WriteSpec(ConstCharRange fmt, bool esc): FormatSpec(fmt, esc) {}
|
|
|
|
/* string base writer */
|
|
template<typename R>
|
|
Ptrdiff write_str(R &writer, bool escape, ConstCharRange val) {
|
|
if (escape) {
|
|
return write_str(writer, false, escape_fmt_str(val));
|
|
}
|
|
Size n = val.size();
|
|
if (this->precision()) n = this->precision();
|
|
Ptrdiff r = n;
|
|
r += this->write_spaces(writer, n, true);
|
|
writer.put_n(&val[0], n);
|
|
r += this->write_spaces(writer, n, false);
|
|
return r;
|
|
}
|
|
|
|
/* any string value */
|
|
template<typename R, typename T>
|
|
Ptrdiff write(R &writer, bool escape, const T &val, EnableIf<
|
|
IsConstructible<ConstCharRange, const T &>, bool
|
|
> = true) {
|
|
if (this->spec() != 's') {
|
|
assert(false && "cannot print strings with the given spec");
|
|
return -1;
|
|
}
|
|
return write_str(writer, escape, val);
|
|
}
|
|
|
|
/* character */
|
|
template<typename R>
|
|
Ptrdiff write(R &writer, bool escape, char val) {
|
|
if (this->spec() != 's' && this->spec() != 'c') {
|
|
assert(false && "cannot print chars with the given spec");
|
|
return -1;
|
|
}
|
|
if (escape) {
|
|
const char *esc = escape_fmt_char(val, '\'');
|
|
if (esc) {
|
|
char buf[6];
|
|
buf[0] = '\'';
|
|
Size elen = strlen(esc);
|
|
memcpy(buf + 1, esc, elen);
|
|
buf[elen + 1] = '\'';
|
|
return write(writer, false, (const char *)buf, elen + 2);
|
|
}
|
|
}
|
|
Ptrdiff r = 1 + escape * 2;
|
|
r += this->write_spaces(writer, 1 + escape * 2, true);
|
|
if (escape) {
|
|
writer.put('\'');
|
|
writer.put(val);
|
|
writer.put('\'');
|
|
} else writer.put(val);
|
|
r += this->write_spaces(writer, 1 + escape * 2, false);
|
|
return r;
|
|
}
|
|
|
|
/* bool */
|
|
template<typename R>
|
|
Ptrdiff write(R &writer, bool, bool val) {
|
|
if (this->spec() == 's')
|
|
return write(writer, ("false\0true") + (6 * val));
|
|
else
|
|
return write(writer, int(val));
|
|
}
|
|
|
|
/* signed integers */
|
|
template<typename R, typename T>
|
|
Ptrdiff write(R &writer, bool, T val, EnableIf<
|
|
IsIntegral<T> && IsSigned<T>, bool
|
|
> = true) {
|
|
using UT = MakeUnsigned<T>;
|
|
return detail::write_u(writer, this, val < 0,
|
|
(val < 0) ? (UT)(-val) : (UT)(val));
|
|
}
|
|
|
|
/* unsigned integers */
|
|
template<typename R, typename T>
|
|
Ptrdiff write(R &writer, bool, T val, EnableIf<
|
|
IsIntegral<T> && IsUnsigned<T>, bool
|
|
> = true) {
|
|
return detail::write_u(writer, this, false, val);
|
|
}
|
|
|
|
template<typename R, typename T, bool Long = IsSame<T, ldouble>>
|
|
Ptrdiff write(R &writer, bool, T val, EnableIf<IsFloatingPoint<T>, bool>
|
|
= true) {
|
|
char buf[16], rbuf[128];
|
|
char fmtspec[Long + 1];
|
|
|
|
fmtspec[Long] = this->spec();
|
|
byte specn = detail::fmt_specs[this->spec() - 65];
|
|
if (specn != 1 && specn != 7) {
|
|
assert(false && "cannot format floats with the given spec");
|
|
return -1;
|
|
}
|
|
if (specn == 7) fmtspec[Long] = 'g';
|
|
if (Long) fmtspec[0] = 'L';
|
|
|
|
buf[this->build_spec(iter(buf), fmtspec)] = '\0';
|
|
Ptrdiff ret = snprintf(rbuf, sizeof(rbuf), buf,
|
|
this->width(),
|
|
this->has_precision() ? this->precision() : 6, val);
|
|
|
|
char *dbuf = nullptr;
|
|
if (Size(ret) >= sizeof(rbuf)) {
|
|
/* this should typically never happen */
|
|
dbuf = (char *)malloc(ret + 1);
|
|
ret = snprintf(dbuf, ret + 1, buf, this->width(),
|
|
this->has_precision() ? this->precision() : 6, val);
|
|
writer.put_n(dbuf, ret);
|
|
free(dbuf);
|
|
} else writer.put_n(rbuf, ret);
|
|
return ret;
|
|
}
|
|
|
|
/* pointer value */
|
|
template<typename R, typename T>
|
|
Ptrdiff write(R &writer, bool, T *val, EnableIf<
|
|
!IsConstructible<ConstCharRange, T *>, bool
|
|
> = true) {
|
|
if (this->p_spec == 's') {
|
|
this->p_spec = 'x';
|
|
this->p_flags |= FMT_FLAG_HASH;
|
|
}
|
|
return write(writer, false, Size(val));
|
|
}
|
|
|
|
/* generic value */
|
|
template<typename R, typename T>
|
|
Ptrdiff write(R &writer, bool, const T &val, EnableIf<
|
|
!IsArithmetic<T> &&
|
|
!IsConstructible<ConstCharRange, const T &> &&
|
|
FmtTostrTest<T> && !FmtTofmtTest<T, TostrRange<R>>, bool
|
|
> = true) {
|
|
if (this->spec() != 's') {
|
|
assert(false && "custom objects need '%s' format");
|
|
return -1;
|
|
}
|
|
return write(writer, false, ostd::to_string(val));
|
|
}
|
|
|
|
/* custom format case */
|
|
template<typename R, typename T>
|
|
Ptrdiff write(R &writer, bool, const T &val,
|
|
EnableIf<FmtTofmtTest<T, TostrRange<R>>, bool
|
|
> = true) {
|
|
TostrRange<R> sink(writer);
|
|
if (!to_format(val, sink, *this)) return -1;
|
|
return sink.get_written();
|
|
}
|
|
|
|
/* generic failure case */
|
|
template<typename R, typename T>
|
|
Ptrdiff write(R &, bool, const T &, EnableIf<
|
|
!IsArithmetic<T> &&
|
|
!IsConstructible<ConstCharRange, const T &> &&
|
|
!FmtTostrTest<T> && !FmtTofmtTest<T, TostrRange<R>>, bool
|
|
> = true) {
|
|
assert(false && "value cannot be formatted");
|
|
return -1;
|
|
}
|
|
|
|
/* actual writer */
|
|
template<typename R, typename T>
|
|
Ptrdiff write_arg(R &writer, Size idx, const T &val) {
|
|
if (idx) {
|
|
assert(false && "not enough format args");
|
|
return -1;
|
|
}
|
|
return write(writer, this->p_nested_escape, val);
|
|
}
|
|
|
|
template<typename R, typename T, typename ...A>
|
|
Ptrdiff write_arg(R &writer, Size idx, const T &val,
|
|
const A &...args) {
|
|
if (idx) return write_arg(writer, idx - 1, args...);
|
|
return write(writer, this->p_nested_escape, val);
|
|
}
|
|
|
|
/* range writer */
|
|
template<typename R, typename T>
|
|
Ptrdiff write_range(R &writer, Size idx, bool expandval,
|
|
ConstCharRange sep, const T &val) {
|
|
if (idx) {
|
|
assert(false && "not enough format args");
|
|
return -1;
|
|
}
|
|
return detail::write_range(writer, this, this->p_nested_escape,
|
|
expandval, sep, val);
|
|
}
|
|
|
|
template<typename R, typename T, typename ...A>
|
|
Ptrdiff write_range(R &writer, Size idx, bool expandval,
|
|
ConstCharRange sep, const T &val,
|
|
const A &...args) {
|
|
if (idx) {
|
|
return write_range(writer, idx - 1, expandval, sep, args...);
|
|
}
|
|
return detail::write_range(writer, this,
|
|
this->p_nested_escape, expandval, sep, val);
|
|
}
|
|
};
|
|
|
|
template<typename R, typename ...A>
|
|
inline Ptrdiff format_impl(R &writer, Size &fmtn, bool escape,
|
|
ConstCharRange fmt, const A &...args) {
|
|
Size argidx = 1, retn = 0, twr = 0;
|
|
Ptrdiff written = 0;
|
|
detail::WriteSpec spec(fmt, escape);
|
|
while (spec.read_until_spec(writer, &twr)) {
|
|
written += twr;
|
|
Size argpos = spec.index();
|
|
if (spec.is_nested()) {
|
|
if (!argpos) argpos = argidx++;
|
|
/* FIXME: figure out a better way */
|
|
detail::WriteSpec nspec(spec.nested(), spec.nested_escape());
|
|
Ptrdiff sw = nspec.write_range(writer, argpos - 1,
|
|
(spec.flags() & FMT_FLAG_HASH),
|
|
spec.nested_sep(), args...);
|
|
if (sw < 0) return sw;
|
|
written += sw;
|
|
continue;
|
|
}
|
|
if (!argpos) {
|
|
argpos = argidx++;
|
|
if (spec.arg_width()) {
|
|
if (!spec.set_width(argpos - 1, args...))
|
|
return -1;
|
|
argpos = argidx++;
|
|
}
|
|
if (spec.arg_precision()) {
|
|
if (!spec.set_precision(argpos - 1, args...))
|
|
return -1;
|
|
argpos = argidx++;
|
|
}
|
|
} else {
|
|
bool argprec = spec.arg_precision();
|
|
if (argprec) {
|
|
if (argpos <= 1) {
|
|
assert(false && "argument precision not given");
|
|
return -1;
|
|
}
|
|
if (!spec.set_precision(argpos - 2, args...))
|
|
return -1;
|
|
}
|
|
if (spec.arg_width()) {
|
|
if (argpos <= (Size(argprec) + 1)) {
|
|
assert(false && "argument width not given");
|
|
return -1;
|
|
}
|
|
if (!spec.set_width(argpos - 2 - argprec, args...))
|
|
return -1;
|
|
}
|
|
}
|
|
Ptrdiff sw = spec.write_arg(writer, argpos - 1, args...);
|
|
if (sw < 0) return sw;
|
|
written += sw;
|
|
}
|
|
written += twr;
|
|
fmtn = retn;
|
|
return written;
|
|
}
|
|
|
|
template<typename R, typename ...A>
|
|
inline Ptrdiff format_impl(R &writer, Size &fmtn, bool,
|
|
ConstCharRange fmt) {
|
|
Size written = 0;
|
|
detail::WriteSpec spec(fmt, false);
|
|
if (spec.read_until_spec(writer, &written)) return -1;
|
|
fmtn = 0;
|
|
return written;
|
|
}
|
|
} /* namespace detail */
|
|
|
|
template<typename R, typename ...A>
|
|
inline Ptrdiff format(R &&writer, Size &fmtn, ConstCharRange fmt,
|
|
const A &...args) {
|
|
return detail::format_impl(writer, fmtn, false, fmt, args...);
|
|
}
|
|
|
|
template<typename R, typename ...A>
|
|
Ptrdiff format(R &&writer, ConstCharRange fmt, const A &...args) {
|
|
Size fmtn = 0;
|
|
return format(writer, fmtn, fmt, args...);
|
|
}
|
|
|
|
} /* namespace ostd */
|
|
|
|
#endif
|