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diff --git a/prism/encoding.h b/prism/encoding.h
deleted file mode 100644
index 5f7724821f..0000000000
--- a/prism/encoding.h
+++ /dev/null
@@ -1,283 +0,0 @@
-/**
- * @file encoding.h
- *
- * The encoding interface and implementations used by the parser.
- */
-#ifndef PRISM_ENCODING_H
-#define PRISM_ENCODING_H
-
-#include "prism/defines.h"
-#include "prism/util/pm_strncasecmp.h"
-
-#include <assert.h>
-#include <stdbool.h>
-#include <stddef.h>
-#include <stdint.h>
-
-/**
- * This struct defines the functions necessary to implement the encoding
- * interface so we can determine how many bytes the subsequent character takes.
- * Each callback should return the number of bytes, or 0 if the next bytes are
- * invalid for the encoding and type.
- */
-typedef struct {
-    /**
-     * Return the number of bytes that the next character takes if it is valid
-     * in the encoding. Does not read more than n bytes. It is assumed that n is
-     * at least 1.
-     */
-    size_t (*char_width)(const uint8_t *b, ptrdiff_t n);
-
-    /**
-     * Return the number of bytes that the next character takes if it is valid
-     * in the encoding and is alphabetical. Does not read more than n bytes. It
-     * is assumed that n is at least 1.
-     */
-    size_t (*alpha_char)(const uint8_t *b, ptrdiff_t n);
-
-    /**
-     * Return the number of bytes that the next character takes if it is valid
-     * in the encoding and is alphanumeric. Does not read more than n bytes. It
-     * is assumed that n is at least 1.
-     */
-    size_t (*alnum_char)(const uint8_t *b, ptrdiff_t n);
-
-    /**
-     * Return true if the next character is valid in the encoding and is an
-     * uppercase character. Does not read more than n bytes. It is assumed that
-     * n is at least 1.
-     */
-    bool (*isupper_char)(const uint8_t *b, ptrdiff_t n);
-
-    /**
-     * The name of the encoding. This should correspond to a value that can be
-     * passed to Encoding.find in Ruby.
-     */
-    const char *name;
-
-    /**
-     * Return true if the encoding is a multibyte encoding.
-     */
-    bool multibyte;
-} pm_encoding_t;
-
-/**
- * All of the lookup tables use the first bit of each embedded byte to indicate
- * whether the codepoint is alphabetical.
- */
-#define PRISM_ENCODING_ALPHABETIC_BIT 1 << 0
-
-/**
- * All of the lookup tables use the second bit of each embedded byte to indicate
- * whether the codepoint is alphanumeric.
- */
-#define PRISM_ENCODING_ALPHANUMERIC_BIT 1 << 1
-
-/**
- * All of the lookup tables use the third bit of each embedded byte to indicate
- * whether the codepoint is uppercase.
- */
-#define PRISM_ENCODING_UPPERCASE_BIT 1 << 2
-
-/**
- * Return the size of the next character in the UTF-8 encoding.
- *
- * @param b The bytes to read.
- * @param n The number of bytes that can be read.
- * @returns The number of bytes that the next character takes if it is valid in
- *     the encoding, or 0 if it is not.
- */
-size_t pm_encoding_utf_8_char_width(const uint8_t *b, ptrdiff_t n);
-
-/**
- * Return the size of the next character in the UTF-8 encoding if it is an
- * alphabetical character.
- *
- * @param b The bytes to read.
- * @param n The number of bytes that can be read.
- * @returns The number of bytes that the next character takes if it is valid in
- *     the encoding, or 0 if it is not.
- */
-size_t pm_encoding_utf_8_alpha_char(const uint8_t *b, ptrdiff_t n);
-
-/**
- * Return the size of the next character in the UTF-8 encoding if it is an
- * alphanumeric character.
- *
- * @param b The bytes to read.
- * @param n The number of bytes that can be read.
- * @returns The number of bytes that the next character takes if it is valid in
- *     the encoding, or 0 if it is not.
- */
-size_t pm_encoding_utf_8_alnum_char(const uint8_t *b, ptrdiff_t n);
-
-/**
- * Return true if the next character in the UTF-8 encoding if it is an uppercase
- * character.
- *
- * @param b The bytes to read.
- * @param n The number of bytes that can be read.
- * @returns True if the next character is valid in the encoding and is an
- *     uppercase character, or false if it is not.
- */
-bool pm_encoding_utf_8_isupper_char(const uint8_t *b, ptrdiff_t n);
-
-/**
- * This lookup table is referenced in both the UTF-8 encoding file and the
- * parser directly in order to speed up the default encoding processing. It is
- * used to indicate whether a character is alphabetical, alphanumeric, or
- * uppercase in unicode mappings.
- */
-extern const uint8_t pm_encoding_unicode_table[256];
-
-/**
- * These are all of the encodings that prism supports.
- */
-typedef enum {
-    PM_ENCODING_UTF_8 = 0,
-    PM_ENCODING_US_ASCII,
-    PM_ENCODING_ASCII_8BIT,
-    PM_ENCODING_EUC_JP,
-    PM_ENCODING_WINDOWS_31J,
-
-// We optionally support excluding the full set of encodings to only support the
-// minimum necessary to process Ruby code without encoding comments.
-#ifndef PRISM_ENCODING_EXCLUDE_FULL
-    PM_ENCODING_BIG5,
-    PM_ENCODING_BIG5_HKSCS,
-    PM_ENCODING_BIG5_UAO,
-    PM_ENCODING_CESU_8,
-    PM_ENCODING_CP51932,
-    PM_ENCODING_CP850,
-    PM_ENCODING_CP852,
-    PM_ENCODING_CP855,
-    PM_ENCODING_CP949,
-    PM_ENCODING_CP950,
-    PM_ENCODING_CP951,
-    PM_ENCODING_EMACS_MULE,
-    PM_ENCODING_EUC_JP_MS,
-    PM_ENCODING_EUC_JIS_2004,
-    PM_ENCODING_EUC_KR,
-    PM_ENCODING_EUC_TW,
-    PM_ENCODING_GB12345,
-    PM_ENCODING_GB18030,
-    PM_ENCODING_GB1988,
-    PM_ENCODING_GB2312,
-    PM_ENCODING_GBK,
-    PM_ENCODING_IBM437,
-    PM_ENCODING_IBM720,
-    PM_ENCODING_IBM737,
-    PM_ENCODING_IBM775,
-    PM_ENCODING_IBM852,
-    PM_ENCODING_IBM855,
-    PM_ENCODING_IBM857,
-    PM_ENCODING_IBM860,
-    PM_ENCODING_IBM861,
-    PM_ENCODING_IBM862,
-    PM_ENCODING_IBM863,
-    PM_ENCODING_IBM864,
-    PM_ENCODING_IBM865,
-    PM_ENCODING_IBM866,
-    PM_ENCODING_IBM869,
-    PM_ENCODING_ISO_8859_1,
-    PM_ENCODING_ISO_8859_2,
-    PM_ENCODING_ISO_8859_3,
-    PM_ENCODING_ISO_8859_4,
-    PM_ENCODING_ISO_8859_5,
-    PM_ENCODING_ISO_8859_6,
-    PM_ENCODING_ISO_8859_7,
-    PM_ENCODING_ISO_8859_8,
-    PM_ENCODING_ISO_8859_9,
-    PM_ENCODING_ISO_8859_10,
-    PM_ENCODING_ISO_8859_11,
-    PM_ENCODING_ISO_8859_13,
-    PM_ENCODING_ISO_8859_14,
-    PM_ENCODING_ISO_8859_15,
-    PM_ENCODING_ISO_8859_16,
-    PM_ENCODING_KOI8_R,
-    PM_ENCODING_KOI8_U,
-    PM_ENCODING_MAC_CENT_EURO,
-    PM_ENCODING_MAC_CROATIAN,
-    PM_ENCODING_MAC_CYRILLIC,
-    PM_ENCODING_MAC_GREEK,
-    PM_ENCODING_MAC_ICELAND,
-    PM_ENCODING_MAC_JAPANESE,
-    PM_ENCODING_MAC_ROMAN,
-    PM_ENCODING_MAC_ROMANIA,
-    PM_ENCODING_MAC_THAI,
-    PM_ENCODING_MAC_TURKISH,
-    PM_ENCODING_MAC_UKRAINE,
-    PM_ENCODING_SHIFT_JIS,
-    PM_ENCODING_SJIS_DOCOMO,
-    PM_ENCODING_SJIS_KDDI,
-    PM_ENCODING_SJIS_SOFTBANK,
-    PM_ENCODING_STATELESS_ISO_2022_JP,
-    PM_ENCODING_STATELESS_ISO_2022_JP_KDDI,
-    PM_ENCODING_TIS_620,
-    PM_ENCODING_UTF8_MAC,
-    PM_ENCODING_UTF8_DOCOMO,
-    PM_ENCODING_UTF8_KDDI,
-    PM_ENCODING_UTF8_SOFTBANK,
-    PM_ENCODING_WINDOWS_1250,
-    PM_ENCODING_WINDOWS_1251,
-    PM_ENCODING_WINDOWS_1252,
-    PM_ENCODING_WINDOWS_1253,
-    PM_ENCODING_WINDOWS_1254,
-    PM_ENCODING_WINDOWS_1255,
-    PM_ENCODING_WINDOWS_1256,
-    PM_ENCODING_WINDOWS_1257,
-    PM_ENCODING_WINDOWS_1258,
-    PM_ENCODING_WINDOWS_874,
-#endif
-
-    PM_ENCODING_MAXIMUM
-} pm_encoding_type_t;
-
-/**
- * This is the table of all of the encodings that prism supports.
- */
-extern const pm_encoding_t pm_encodings[PM_ENCODING_MAXIMUM];
-
-/**
- * This is the default UTF-8 encoding. We need a reference to it to quickly
- * create parsers.
- */
-#define PM_ENCODING_UTF_8_ENTRY (&pm_encodings[PM_ENCODING_UTF_8])
-
-/**
- * This is the US-ASCII encoding. We need a reference to it to be able to
- * compare against it when a string is being created because it could possibly
- * need to fall back to ASCII-8BIT.
- */
-#define PM_ENCODING_US_ASCII_ENTRY (&pm_encodings[PM_ENCODING_US_ASCII])
-
-/**
- * This is the ASCII-8BIT encoding. We need a reference to it so that pm_strpbrk
- * can compare against it because invalid multibyte characters are not a thing
- * in this encoding. It is also needed for handling Regexp encoding flags.
- */
-#define PM_ENCODING_ASCII_8BIT_ENTRY (&pm_encodings[PM_ENCODING_ASCII_8BIT])
-
-/**
- * This is the EUC-JP encoding. We need a reference to it to quickly process
- * regular expression modifiers.
- */
-#define PM_ENCODING_EUC_JP_ENTRY (&pm_encodings[PM_ENCODING_EUC_JP])
-
-/**
- * This is the Windows-31J encoding. We need a reference to it to quickly
- * process regular expression modifiers.
- */
-#define PM_ENCODING_WINDOWS_31J_ENTRY (&pm_encodings[PM_ENCODING_WINDOWS_31J])
-
-/**
- * Parse the given name of an encoding and return a pointer to the corresponding
- * encoding struct if one can be found, otherwise return NULL.
- *
- * @param start A pointer to the first byte of the name.
- * @param end A pointer to the last byte of the name.
- * @returns A pointer to the encoding struct if one is found, otherwise NULL.
- */
-const pm_encoding_t * pm_encoding_find(const uint8_t *start, const uint8_t *end);
-
-#endif