1 files changed, 85 insertions, 0 deletions
diff --git a/backend/lib/MIR/MIRParserUtilities.h b/backend/lib/MIR/MIRParserUtilities.h
new file mode 100644
index 0000000..2f69548
--- /dev/null
+++ b/backend/lib/MIR/MIRParserUtilities.h
@@ -0,0 +1,85 @@
+// 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