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diff --git a/py/parse2.h b/py/parse2.h
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+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2013-2016 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#ifndef __MICROPY_INCLUDED_PY_PARSE_H__
+#define __MICROPY_INCLUDED_PY_PARSE_H__
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "py/obj.h"
+
+struct _mp_lexer_t;
+
+#define MP_PT_NULL (0)
+#define MP_PT_TOKEN (1)
+#define MP_PT_SMALL_INT (3)
+#define MP_PT_STRING (4)
+#define MP_PT_BYTES (5)
+#define MP_PT_CONST_OBJECT (8)
+#define MP_PT_ID_BASE (10) // +16
+#define MP_PT_RULE_BASE (26) // +173-ish
+
+extern const byte pt_const_int0[];
+
+static inline const byte *pt_tok_extract(const byte *p, byte *tok) {
+    //assert(*p == MP_PT_TOKEN);
+    p += 1;
+    *tok = *p++;
+    return p;
+}
+
+static inline bool pt_is_null(const byte *p) {
+    return *p == MP_PT_NULL;
+}
+
+static inline bool pt_is_null_with_top(const byte *p, const byte *ptop) {
+    return p == ptop || *p == MP_PT_NULL;
+}
+
+static inline bool pt_is_small_int(const byte *p) {
+    return *p == MP_PT_SMALL_INT;
+}
+
+static inline bool pt_is_any_rule(const byte *p) {
+    return *p >= MP_PT_RULE_BASE;
+}
+
+static inline mp_uint_t pt_rule_extract_rule_id(const byte *p) {
+    return *p - MP_PT_RULE_BASE;
+}
+
+static inline bool pt_is_any_id(const byte *p) {
+    return *p >= MP_PT_ID_BASE && *p < MP_PT_RULE_BASE;
+}
+
+static inline bool pt_is_id(const byte *p, qstr qst) {
+    //assert(*p == MP_PT_ID_BASE);
+    return qst == ((mp_uint_t)p[1] | (((mp_uint_t)p[0] - MP_PT_ID_BASE) << 8));
+}
+
+static inline bool pt_is_any_tok(const byte *p) {
+    return p[0] == MP_PT_TOKEN;
+}
+
+static inline bool pt_is_tok(const byte *p, int tok) {
+    return p[0] == MP_PT_TOKEN && p[1] == tok;
+}
+
+static inline bool pt_is_rule(const byte *p, int rule) {
+    return *p == MP_PT_RULE_BASE + rule;
+}
+
+int pt_num_nodes(const byte *p, const byte *ptop);
+const byte *pt_next(const byte *p);
+
+//const byte *pt_extract_id(const byte *p, qstr *qst);
+static inline const byte *pt_extract_id(const byte *p, qstr *qst) {
+    //assert(*p == MP_PT_ID_BASE);
+    *qst = p[1] | ((p[0] - MP_PT_ID_BASE) << 8);
+    return p + 2;
+}
+
+const byte *pt_extract_const_obj(const byte *p, mp_uint_t *idx);
+mp_int_t pt_small_int_value(const byte *p);
+const byte *pt_get_small_int(const byte *p, mp_int_t *val);
+const byte *pt_rule_first(const byte *p);
+const byte *pt_rule_extract_top(const byte *p, const byte **ptop);
+const byte *pt_rule_extract(const byte *p, mp_uint_t *rule_id, size_t *src_line, const byte **ptop);
+bool pt_is_rule_empty(const byte *p);
+
+bool mp_parse_node_get_int_maybe(const byte *p, mp_obj_t *o);
+const byte *mp_parse_node_extract_list(const byte **p, mp_uint_t pn_kind);
+
+typedef enum {
+    MP_PARSE_SINGLE_INPUT,
+    MP_PARSE_FILE_INPUT,
+    MP_PARSE_EVAL_INPUT,
+} mp_parse_input_kind_t;
+
+typedef struct _mp_parse_t {
+    const byte *root;
+    mp_uint_t *co_data;
+    struct _mp_parse_chunk_t *chunk;
+} mp_parse_tree_t;
+
+// the parser will raise an exception if an error occurred
+// the parser will free the lexer before it returns
+mp_parse_tree_t mp_parse(struct _mp_lexer_t *lex, mp_parse_input_kind_t input_kind);
+void mp_parse_tree_clear(mp_parse_tree_t *tree);
+
+#endif // __MICROPY_INCLUDED_PY_PARSE_H__