1 files changed, 47 insertions, 0 deletions
diff --git a/third_party/nix/src/libexpr/parser.hh b/third_party/nix/src/libexpr/parser.hh
new file mode 100644
index 000000000000..ae0e932147f5
--- /dev/null
+++ b/third_party/nix/src/libexpr/parser.hh
@@ -0,0 +1,47 @@
+// Parser utilities for use in parser.y
+#pragma once
+
+// TODO(tazjin): Audit these includes, they were in parser.y
+#include <optional>
+#include <variant>
+
+#include <glog/logging.h>
+
+#include "libexpr/eval.hh"
+#include "libexpr/nixexpr.hh"
+#include "libutil/util.hh"
+
+#define YY_DECL                                                               \
+  int yylex(YYSTYPE* yylval_param, YYLTYPE* yylloc_param, yyscan_t yyscanner, \
+            nix::ParseData* data)
+
+namespace nix {
+
+struct ParseData {
+  EvalState& state;
+  SymbolTable& symbols;
+  Expr* result;
+  Path basePath;
+  std::optional<Symbol> path;
+  std::string error;
+  Symbol sLetBody;
+
+  ParseData(EvalState& state)
+      : state(state),
+        symbols(state.symbols),
+        sLetBody(symbols.Create("<let-body>")){};
+};
+
+// TODO(tazjin): move dupAttr to anonymous namespace
+static void dupAttr(const AttrPath& attrPath, const Pos& pos,
+                    const Pos& prevPos) {
+  throw ParseError(format("attribute '%1%' at %2% already defined at %3%") %
+                   showAttrPath(attrPath) % pos % prevPos);
+}
+
+static void dupAttr(Symbol attr, const Pos& pos, const Pos& prevPos) {
+  throw ParseError(format("attribute '%1%' at %2% already defined at %3%") %
+                   attr % pos % prevPos);
+}
+
+}  // namespace nix