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// SPDX-License-Identifier: GPL-3.0-or-later
// NOLINTNEXTLINE(llvm-header-guard)
#ifndef RCC_LIB_MIR_MIRPARSERUTILITIES_H
#define RCC_LIB_MIR_MIRPARSERUTILITIES_H
#include <charconv>
#include <cstdint>
#include <limits>
#include <optional>
#include <string_view>
namespace rcc::mir::parser_detail {
[[nodiscard]] inline std::string_view trim(std::string_view Text) noexcept {
while (!Text.empty() && (Text.front() == ' ' || Text.front() == '\t' || Text.front() == '\r' ||
Text.front() == '\n')) {
Text.remove_prefix(1);
}
while (!Text.empty() && (Text.back() == ' ' || Text.back() == '\t' || Text.back() == '\r' ||
Text.back() == '\n')) {
Text.remove_suffix(1);
}
return Text;
}
[[nodiscard]] inline bool parseUnsigned(std::string_view Text, std::uint64_t &Value) noexcept {
Text = trim(Text);
int Base = 10;
if (Text.starts_with("0x") || Text.starts_with("0X")) {
Text.remove_prefix(2);
Base = 16;
}
if (Text.empty())
return false;
const auto [End, Error] = std::from_chars(Text.data(), Text.data() + Text.size(), Value, Base);
return Error == std::errc{} && End == Text.data() + Text.size();
}
[[nodiscard]] inline bool parseSigned(std::string_view Text, std::int64_t &Value) noexcept {
Text = trim(Text);
if (Text.empty())
return false;
const auto [End, Error] = std::from_chars(Text.data(), Text.data() + Text.size(), Value, 10);
return Error == std::errc{} && End == Text.data() + Text.size();
}
[[nodiscard]] inline bool parseUnsigned32(std::string_view Text, std::uint32_t &Value) noexcept {
std::uint64_t Wide = 0;
if (!parseUnsigned(Text, Wide) || Wide > std::numeric_limits<std::uint32_t>::max())
return false;
Value = static_cast<std::uint32_t>(Wide);
return true;
}
[[nodiscard]] inline bool parseBool(std::string_view Text, bool &Value) noexcept {
if (Text == "true") {
Value = true;
return true;
}
if (Text == "false") {
Value = false;
return true;
}
return false;
}
[[nodiscard]] inline std::optional<std::uint32_t>
parsePrefixedID(std::string_view Text, std::string_view Prefix) noexcept {
Text = trim(Text);
if (!Text.starts_with(Prefix))
return std::nullopt;
Text.remove_prefix(Prefix.size());
const std::size_t Suffix = Text.find_first_of(". \t");
if (Suffix != std::string_view::npos)
Text = Text.substr(0, Suffix);
std::uint32_t ID = 0;
if (!parseUnsigned32(Text, ID))
return std::nullopt;
return ID;
}
} // namespace rcc::mir::parser_detail
#endif // RCC_LIB_MIR_MIRPARSERUTILITIES_H
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