1 files changed, 83 insertions, 0 deletions
diff --git a/backend/include/rcc/Support/TextDiagnostic.h b/backend/include/rcc/Support/TextDiagnostic.h
new file mode 100644
index 0000000..4c21486
--- /dev/null
+++ b/backend/include/rcc/Support/TextDiagnostic.h
@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef RCC_SUPPORT_TEXTDIAGNOSTIC_H
+#define RCC_SUPPORT_TEXTDIAGNOSTIC_H
+
+#include <cstddef>
+#include <span>
+#include <string>
+#include <string_view>
+#include <vector>
+
+namespace rcc {
+
+struct TextPosition final {
+  std::size_t Offset = 0;
+  std::size_t Line = 1;
+  std::size_t Column = 1;
+
+  friend constexpr bool operator==(TextPosition Left, TextPosition Right) noexcept = default;
+};
+
+struct TextRange final {
+  TextPosition Begin;
+  TextPosition End;
+
+  [[nodiscard]] constexpr bool isOrdered() const noexcept {
+    return Begin.Offset <= End.Offset;
+  }
+
+  friend constexpr bool operator==(TextRange Left, TextRange Right) noexcept = default;
+};
+
+enum class DiagnosticSeverity : unsigned char {
+  Note,
+  Warning,
+  Error,
+};
+
+[[nodiscard]] std::string_view getDiagnosticSeverityName(DiagnosticSeverity Severity) noexcept;
+
+struct TextDiagnostic final {
+  DiagnosticSeverity Severity = DiagnosticSeverity::Error;
+  std::string Category;
+  std::string Message;
+  std::string SourceName;
+  TextRange Range;
+};
+
+class TextSource final {
+public:
+  TextSource(std::string Name, std::string Text);
+
+  [[nodiscard]] std::string_view name() const noexcept {
+    return Name;
+  }
+
+  [[nodiscard]] std::string_view text() const noexcept {
+    return Text;
+  }
+
+  [[nodiscard]] std::size_t lineCount() const noexcept {
+    return LineOffsets.size();
+  }
+
+  [[nodiscard]] TextPosition positionAt(std::size_t Offset) const noexcept;
+  [[nodiscard]] TextRange range(std::size_t Begin, std::size_t End) const noexcept;
+  [[nodiscard]] std::string_view line(std::size_t OneBasedLine) const noexcept;
+  [[nodiscard]] std::span<const std::size_t> lineOffsets() const noexcept {
+    return LineOffsets;
+  }
+
+private:
+  std::string Name;
+  std::string Text;
+  std::vector<std::size_t> LineOffsets;
+};
+
+[[nodiscard]] std::string formatTextDiagnostic(const TextDiagnostic &Diagnostic,
+                                               const TextSource &Source);
+
+} // namespace rcc
+
+#endif // RCC_SUPPORT_TEXTDIAGNOSTIC_H