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authorEelco Dolstra <e.dolstra@tudelft.nl>2003-11-19T11·35+0000
committerEelco Dolstra <e.dolstra@tudelft.nl>2003-11-19T11·35+0000
commitac68840e79ce74f05ee8b31bb1d528c98b9c7f76 (patch)
tree98e8251d0537197b1c3e53068529f1e5e3114fdc /src/libexpr/eval.hh
parent2be8b5917a8040fac72e7970e94bbb436e8c35d6 (diff)
* Refactoring: put the Nix expression evaluator in its own library so
  that it can be used by multiple programs.

Diffstat (limited to 'src/libexpr/eval.hh')
-rw-r--r--src/libexpr/eval.hh42
1 files changed, 42 insertions, 0 deletions
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
new file mode 100644
index 000000000000..0bc052676deb
--- /dev/null
+++ b/src/libexpr/eval.hh
@@ -0,0 +1,42 @@
+#ifndef __EVAL_H
+#define __EVAL_H
+
+#include <map>
+
+#include "aterm.hh"
+#include "hash.hh"
+#include "nixexpr.hh"
+
+
+typedef map<Path, PathSet> DrvPaths;
+typedef map<Path, Hash> DrvHashes;
+
+struct EvalState 
+{
+    ATermMap normalForms;
+    DrvPaths drvPaths;
+    DrvHashes drvHashes; /* normalised derivation hashes */
+    Expr blackHole;
+
+    unsigned int nrEvaluated;
+    unsigned int nrCached;
+
+    EvalState();
+};
+
+
+/* Evaluate an expression to normal form. */
+Expr evalExpr(EvalState & state, Expr e);
+
+/* Evaluate an expression read from the given file to normal form. */
+Expr evalFile(EvalState & state, const Path & path);
+
+/* Specific results. */
+string evalString(EvalState & state, Expr e);
+Path evalPath(EvalState & state, Expr e);
+
+/* Print statistics. */
+void printEvalStats(EvalState & state);
+
+
+#endif /* !__EVAL_H */