87 lines
2.3 KiB
C++
87 lines
2.3 KiB
C++
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/* Format strings for OctaSTD.
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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 OCTA_FORMAT_HH
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#define OCTA_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 "octa/algorithm.hh"
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#include "octa/string.hh"
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namespace octa {
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template<typename R>
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static inline void write_val(R &writer, const char *val) {
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while (*val) writer.put(*val++);
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}
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template<typename R>
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static inline void write_val(R &writer, const octa::String &val) {
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for (octa::Size i = 0; i < val.size(); ++i) writer.put(val[i]);
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}
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template<typename R>
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static inline void write_val(R &writer, char val) {
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writer.put(val);
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}
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template<typename R, typename T>
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static inline void write_val(R &writer, const T &val) {
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write_val(writer, octa::to_string(val));
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}
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template<typename R, typename T, typename ...A>
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static inline void write_idx(R &writer, octa::Size idx, const T &v) {
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if (idx) assert(false && "not enough format args");
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write_val(writer, v);
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}
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template<typename R, typename T, typename ...A>
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static inline void write_idx(R &writer, octa::Size idx, const T &v,
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A &&...args) {
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if (idx) {
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write_idx(writer, idx - 1, octa::forward<A>(args)...);
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return;
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}
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write_val(writer, v);
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}
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template<typename R, typename ...A>
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static inline octa::Size formatted_write(R writer, const char *fmt,
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A &&...args) {
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octa::Size argidx = 0, retn = 0;
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while (*fmt) {
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if (*fmt == '{') {
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octa::Size needidx = argidx;
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if (*++fmt != '}') {
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char idx[8] = { '\0' };
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for (octa::Size i = 0; isdigit(*fmt); ++i)
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idx[i] = *fmt++;
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assert((*fmt == '}') && "malformed format string");
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needidx = atoi(idx);
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} else ++argidx;
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++fmt;
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retn = octa::max(needidx, retn);
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write_idx(writer, needidx, octa::forward<A>(args)...);
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continue;
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}
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writer.put(*fmt++);
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}
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return retn + 1;
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}
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template<typename R, typename ...A>
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octa::Size formatted_write(R writer, const octa::String &fmt, A &&...args) {
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return formatted_write(writer, fmt.data(), octa::forward<A>(args)...);
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}
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} /* namespace octa */
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#endif
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