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diff --git a/src/earley_composer.h b/src/earley_composer.h
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+++ b/src/earley_composer.h
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+#ifndef _EARLEY_COMPOSER_H_
+#define _EARLEY_COMPOSER_H_
+
+#include <iostream>
+
+class EarleyComposerImpl;
+class FSTNode;
+class Hypergraph;
+
+class EarleyComposer {
+ public:
+  ~EarleyComposer();
+  EarleyComposer(const FSTNode* phrasetable_root);
+  bool Compose(const Hypergraph& src_forest, Hypergraph* trg_forest);
+
+  // reads the grammar from a file. There must be a single top-level
+  // S -> X rule.  Anything else is possible. Format is:
+  // [S] ||| [SS,1]
+  // [SS] ||| [NP,1] [VP,2] ||| Feature1=0.2 Feature2=-2.3
+  // [SS] ||| [VP,1] [NP,2] ||| Feature1=0.8
+  // [NP] ||| [DET,1] [N,2] ||| Feature3=2
+  // ...
+  bool Compose(std::istream* grammar_file, Hypergraph* trg_forest);
+
+ private:
+  EarleyComposerImpl* pimpl_;
+};
+
+#endif