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diff --git a/source/blender/blenlib/BLI_expr_pylike_eval.h b/source/blender/blenlib/BLI_expr_pylike_eval.h
new file mode 100644
index 00000000000..e8311bc43b6
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+++ b/source/blender/blenlib/BLI_expr_pylike_eval.h
@@ -0,0 +1,66 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2018 Blender Foundation, Alexander Gavrilov
+ * All rights reserved.
+ *
+ * Contributor(s): Alexander Gavrilov
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#ifndef __BLI_EXPR_PYLIKE_EVAL_H__
+#define __BLI_EXPR_PYLIKE_EVAL_H__
+
+/** \file BLI_expr_pylike_eval.h
+ *  \ingroup bli
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Opaque structure containing pre-parsed data for evaluation. */
+typedef struct ExprPyLike_Parsed ExprPyLike_Parsed;
+
+/** Expression evaluation return code. */
+typedef enum eExprPyLike_EvalStatus {
+	EXPR_PYLIKE_SUCCESS = 0,
+	/* Computation errors; result is still set, but may be NaN */
+	EXPR_PYLIKE_DIV_BY_ZERO,
+	EXPR_PYLIKE_MATH_ERROR,
+	/* Expression dependent errors or bugs; result is 0 */
+	EXPR_PYLIKE_INVALID,
+	EXPR_PYLIKE_FATAL_ERROR,
+} eExprPyLike_EvalStatus;
+
+void BLI_expr_pylike_free(struct ExprPyLike_Parsed *expr);
+bool BLI_expr_pylike_is_valid(struct ExprPyLike_Parsed *expr);
+bool BLI_expr_pylike_is_constant(struct ExprPyLike_Parsed *expr);
+ExprPyLike_Parsed *BLI_expr_pylike_parse(
+        const char *expression,
+        const char **param_names, int param_names_len);
+eExprPyLike_EvalStatus BLI_expr_pylike_eval(
+        struct ExprPyLike_Parsed *expr,
+        const double *param_values, int param_values_len,
+		double *r_result);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __BLI_EXPR_PYLIKE_EVALUATE_H__ */