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move-only: Detail_CheckNumFormatSpecifiers and G_TRANSLATION_FUN

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Also move util::detail::Hex to a proper namespace instead of an inline
namespace so it doesn't conflict with the new util::detail namespace, and
won't create other problems for callers trying to use the inline namespaces.

Also fix a misleading comment in util_string_tests.cpp.

Co-Authored-By: Ryan Ofsky <ryan@ofsky.org>
This commit is contained in:
MarcoFalke
2024-10-09 11:42:44 +02:00
parent faff8403f0
commit fa72646f2b
4 changed files with 88 additions and 85 deletions
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124
src/util/string.h
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@@ -17,6 +17,69 @@
#include <vector>
namespace util {
namespace detail {
template <unsigned num_params>
constexpr static void CheckNumFormatSpecifiers(const char* str)
{
unsigned count_normal{0}; // Number of "normal" specifiers, like %s
unsigned count_pos{0}; // Max number in positional specifier, like %8$s
for (auto it{str}; *it != '\0'; ++it) {
if (*it != '%' || *++it == '%') continue; // Skip escaped %%
auto add_arg = [&] {
unsigned maybe_num{0};
while ('0' <= *it && *it <= '9') {
maybe_num *= 10;
maybe_num += *it - '0';
++it;
}
if (*it == '$') {
++it;
// Positional specifier, like %8$s
if (maybe_num == 0) throw "Positional format specifier must have position of at least 1";
count_pos = std::max(count_pos, maybe_num);
} else {
// Non-positional specifier, like %s
++count_normal;
}
};
// Increase argument count and consume positional specifier, if present.
add_arg();
// Consume flags.
while (*it == '#' || *it == '0' || *it == '-' || *it == ' ' || *it == '+') ++it;
auto parse_size = [&] {
if (*it == '*') {
++it;
add_arg();
} else {
while ('0' <= *it && *it <= '9') ++it;
}
};
// Consume dynamic or static width value.
parse_size();
// Consume dynamic or static precision value.
if (*it == '.') {
++it;
parse_size();
}
if (*it == '\0') throw "Format specifier incorrectly terminated by end of string";
// Length and type in "[flags][width][.precision][length]type"
// is not checked. Parsing continues with the next '%'.
}
if (count_normal && count_pos) throw "Format specifiers must be all positional or all non-positional!";
unsigned count{count_normal | count_pos};
if (num_params != count) throw "Format specifier count must match the argument count!";
}
} // namespace detail
/**
* @brief A wrapper for a compile-time partially validated format string
*
@@ -28,66 +91,7 @@ namespace util {
template <unsigned num_params>
struct ConstevalFormatString {
const char* const fmt;
consteval ConstevalFormatString(const char* str) : fmt{str} { Detail_CheckNumFormatSpecifiers(fmt); }
constexpr static void Detail_CheckNumFormatSpecifiers(const char* str)
{
unsigned count_normal{0}; // Number of "normal" specifiers, like %s
unsigned count_pos{0}; // Max number in positional specifier, like %8$s
for (auto it{str}; *it != '\0'; ++it) {
if (*it != '%' || *++it == '%') continue; // Skip escaped %%
auto add_arg = [&] {
unsigned maybe_num{0};
while ('0' <= *it && *it <= '9') {
maybe_num *= 10;
maybe_num += *it - '0';
++it;
}
if (*it == '$') {
++it;
// Positional specifier, like %8$s
if (maybe_num == 0) throw "Positional format specifier must have position of at least 1";
count_pos = std::max(count_pos, maybe_num);
} else {
// Non-positional specifier, like %s
++count_normal;
}
};
// Increase argument count and consume positional specifier, if present.
add_arg();
// Consume flags.
while (*it == '#' || *it == '0' || *it == '-' || *it == ' ' || *it == '+') ++it;
auto parse_size = [&] {
if (*it == '*') {
++it;
add_arg();
} else {
while ('0' <= *it && *it <= '9') ++it;
}
};
// Consume dynamic or static width value.
parse_size();
// Consume dynamic or static precision value.
if (*it == '.') {
++it;
parse_size();
}
if (*it == '\0') throw "Format specifier incorrectly terminated by end of string";
// Length and type in "[flags][width][.precision][length]type"
// is not checked. Parsing continues with the next '%'.
}
if (count_normal && count_pos) throw "Format specifiers must be all positional or all non-positional!";
unsigned count{count_normal | count_pos};
if (num_params != count) throw "Format specifier count must match the argument count!";
}
consteval ConstevalFormatString(const char* str) : fmt{str} { detail::CheckNumFormatSpecifiers<num_params>(fmt); }
};
void ReplaceAll(std::string& in_out, const std::string& search, const std::string& substitute);