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diff --git a/yajl/yajl_lex.h b/yajl/yajl_lex.h
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+/*
+ * Copyright (c) 2007-2014, Lloyd Hilaiel <me@lloyd.io>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef __YAJL_LEX_H__
+#define __YAJL_LEX_H__
+
+#include "yajl_common.h"
+
+typedef enum {
+    yajl_tok_bool,
+    yajl_tok_colon,
+    yajl_tok_comma,
+    yajl_tok_eof,
+    yajl_tok_error,
+    yajl_tok_left_brace,
+    yajl_tok_left_bracket,
+    yajl_tok_null,
+    yajl_tok_right_brace,
+    yajl_tok_right_bracket,
+
+    /* we differentiate between integers and doubles to allow the
+     * parser to interpret the number without re-scanning */
+    yajl_tok_integer,
+    yajl_tok_double,
+
+    /* we differentiate between strings which require further processing,
+     * and strings that do not */
+    yajl_tok_string,
+    yajl_tok_string_with_escapes,
+
+    /* we return the two types of comment tokens as well */
+    yajl_tok_c_comment,
+    yajl_tok_cpp_comment
+
+} yajl_tok;
+
+typedef struct yajl_lexer_t * yajl_lexer;
+
+yajl_lexer yajl_lex_alloc(yajl_alloc_funcs * alloc,
+                          unsigned int allowComments,
+                          unsigned int validateUTF8);
+
+void yajl_lex_free(yajl_lexer lexer);
+
+/**
+ * run/continue a lex. "offset" is an input/output parameter.
+ * It should be initialized to zero for a
+ * new chunk of target text, and upon subsetquent calls with the same
+ * target text should passed with the value of the previous invocation.
+ *
+ * the client may be interested in the value of offset when an error is
+ * returned from the lexer.  This allows the client to render useful
+ * error messages.
+ *
+ * When you pass the next chunk of data, context should be reinitialized
+ * to zero.
+ *
+ * Finally, the output buffer is usually just a pointer into the jsonText,
+ * however in cases where the entity being lexed spans multiple chunks,
+ * the lexer will buffer the entity and the data returned will be
+ * a pointer into that buffer.
+ *
+ * This behavior is abstracted from client code except for the performance
+ * implications which require that the client choose a reasonable chunk
+ * size to get adequate performance.
+ */
+yajl_tok yajl_lex_lex(yajl_lexer lexer, const unsigned char * jsonText,
+                      size_t jsonTextLen, size_t * offset,
+                      const unsigned char ** outBuf, size_t * outLen);
+
+/** have a peek at the next token, but don't move the lexer forward */
+yajl_tok yajl_lex_peek(yajl_lexer lexer, const unsigned char * jsonText,
+                       size_t jsonTextLen, size_t offset);
+
+
+typedef enum {
+    yajl_lex_e_ok = 0,
+    yajl_lex_string_invalid_utf8,
+    yajl_lex_string_invalid_escaped_char,
+    yajl_lex_string_invalid_json_char,
+    yajl_lex_string_invalid_hex_char,
+    yajl_lex_invalid_char,
+    yajl_lex_invalid_string,
+    yajl_lex_missing_integer_after_decimal,
+    yajl_lex_missing_integer_after_exponent,
+    yajl_lex_missing_integer_after_minus,
+    yajl_lex_unallowed_comment
+} yajl_lex_error;
+
+const char * yajl_lex_error_to_string(yajl_lex_error error);
+
+/** allows access to more specific information about the lexical
+ *  error when yajl_lex_lex returns yajl_tok_error. */
+yajl_lex_error yajl_lex_get_error(yajl_lexer lexer);
+
+/** get the current offset into the most recently lexed json string. */
+size_t yajl_lex_current_offset(yajl_lexer lexer);
+
+/** get the number of lines lexed by this lexer instance */
+size_t yajl_lex_current_line(yajl_lexer lexer);
+
+/** get the number of chars lexed by this lexer instance since the last
+ *  \n or \r */
+size_t yajl_lex_current_char(yajl_lexer lexer);
+
+#endif