* ext/json: Update to JSON 1.4.1.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27493 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

3 files changed, 1518 insertions, 0 deletions

diff --git a/ext/json/generator/extconf.rb b/ext/json/generator/extconf.rb
new file mode 100644
index 0000000000..ff231a6fe9
--- /dev/null
+++ b/ext/json/generator/extconf.rb
@@ -0,0 +1,14 @@
+require 'mkmf'
+require 'rbconfig'
+
+unless $CFLAGS.gsub!(/ -O[\dsz]?/, ' -O3')
+  $CFLAGS << ' -O3'
+end
+if CONFIG['CC'] =~ /gcc/
+  $CFLAGS << ' -Wall'
+  #unless $CFLAGS.gsub!(/ -O[\dsz]?/, ' -O0 -ggdb')
+  #  $CFLAGS << ' -O0 -ggdb'
+  #end
+end
+
+create_makefile 'json/ext/generator'
diff --git a/ext/json/generator/generator.c b/ext/json/generator/generator.c
new file mode 100644
index 0000000000..555fcce4ab
--- /dev/null
+++ b/ext/json/generator/generator.c
@@ -0,0 +1,1334 @@
+#include "generator.h"
+
+#ifdef HAVE_RUBY_ENCODING_H
+static VALUE CEncoding_UTF_8;
+static ID i_encoding, i_encode;
+#endif
+
+static VALUE mJSON, mExt, mGenerator, cState, mGeneratorMethods, mObject,
+             mHash, mArray, mInteger, mFloat, mString, mString_Extend,
+             mTrueClass, mFalseClass, mNilClass, eGeneratorError,
+             eNestingError, CRegexp_MULTILINE, CJSON_SAFE_STATE_PROTOTYPE;
+
+static ID i_to_s, i_to_json, i_new, i_indent, i_space, i_space_before,
+          i_object_nl, i_array_nl, i_max_nesting, i_allow_nan, i_ascii_only,
+          i_pack, i_unpack, i_create_id, i_extend, i_key_p, i_aref, i_send,
+          i_respond_to_p, i_match;
+
+/*
+ * Copyright 2001-2004 Unicode, Inc.
+ * 
+ * Disclaimer
+ * 
+ * This source code is provided as is by Unicode, Inc. No claims are
+ * made as to fitness for any particular purpose. No warranties of any
+ * kind are expressed or implied. The recipient agrees to determine
+ * applicability of information provided. If this file has been
+ * purchased on magnetic or optical media from Unicode, Inc., the
+ * sole remedy for any claim will be exchange of defective media
+ * within 90 days of receipt.
+ * 
+ * Limitations on Rights to Redistribute This Code
+ * 
+ * Unicode, Inc. hereby grants the right to freely use the information
+ * supplied in this file in the creation of products supporting the
+ * Unicode Standard, and to make copies of this file in any form
+ * for internal or external distribution as long as this notice
+ * remains attached.
+ */
+
+/*
+ * Index into the table below with the first byte of a UTF-8 sequence to
+ * get the number of trailing bytes that are supposed to follow it.
+ * Note that *legal* UTF-8 values can't have 4 or 5-bytes. The table is
+ * left as-is for anyone who may want to do such conversion, which was
+ * allowed in earlier algorithms.
+ */
+static const char trailingBytesForUTF8[256] = {
+    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
+    2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5
+};
+
+/*
+ * Magic values subtracted from a buffer value during UTF8 conversion.
+ * This table contains as many values as there might be trailing bytes
+ * in a UTF-8 sequence.
+ */
+static const UTF32 offsetsFromUTF8[6] = { 0x00000000UL, 0x00003080UL, 0x000E2080UL, 
+		     0x03C82080UL, 0xFA082080UL, 0x82082080UL };
+
+/*
+ * Utility routine to tell whether a sequence of bytes is legal UTF-8.
+ * This must be called with the length pre-determined by the first byte.
+ * If not calling this from ConvertUTF8to*, then the length can be set by:
+ *  length = trailingBytesForUTF8[*source]+1;
+ * and the sequence is illegal right away if there aren't that many bytes
+ * available.
+ * If presented with a length > 4, this returns 0.  The Unicode
+ * definition of UTF-8 goes up to 4-byte sequences.
+ */
+static unsigned char isLegalUTF8(const UTF8 *source, int length)
+{
+    UTF8 a;
+    const UTF8 *srcptr = source+length;
+    switch (length) {
+        default: return 0;
+                 /* Everything else falls through when "1"... */
+        case 4: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return 0;
+        case 3: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return 0;
+        case 2: if ((a = (*--srcptr)) > 0xBF) return 0;
+
+                    switch (*source) {
+                        /* no fall-through in this inner switch */
+                        case 0xE0: if (a < 0xA0) return 0; break;
+                        case 0xED: if (a > 0x9F) return 0; break;
+                        case 0xF0: if (a < 0x90) return 0; break;
+                        case 0xF4: if (a > 0x8F) return 0; break;
+                        default:   if (a < 0x80) return 0;
+                    }
+
+        case 1: if (*source >= 0x80 && *source < 0xC2) return 0;
+    }
+    if (*source > 0xF4) return 0;
+    return 1;
+}
+
+/* Escapes the UTF16 character and stores the result in the buffer buf. */
+static void unicode_escape(char *buf, UTF16 character)
+{
+    const char *digits = "0123456789abcdef";
+
+    buf[2] = digits[character >> 12];
+    buf[3] = digits[(character >> 8) & 0xf];
+    buf[4] = digits[(character >> 4) & 0xf];
+    buf[5] = digits[character & 0xf];
+}
+
+/* Escapes the UTF16 character and stores the result in the buffer buf, then
+ * the buffer buf іs appended to the FBuffer buffer. */
+static void unicode_escape_to_buffer(FBuffer *buffer, char buf[6], UTF16
+        character)
+{
+    unicode_escape(buf, character);
+    fbuffer_append(buffer, buf, 6);
+}
+
+/* Converts string to a JSON string in FBuffer buffer, where all but the ASCII
+ * and control characters are JSON escaped. */
+static void convert_UTF8_to_JSON_ASCII(FBuffer *buffer, VALUE string)
+{
+    const UTF8 *source = (UTF8 *) RSTRING_PTR(string);
+    const UTF8 *sourceEnd = source + RSTRING_LEN(string);
+    char buf[6] = { '\\', 'u' };
+
+    while (source < sourceEnd) {
+        UTF32 ch = 0;
+        unsigned short extraBytesToRead = trailingBytesForUTF8[*source];
+        if (source + extraBytesToRead >= sourceEnd) {
+            rb_raise(rb_path2class("JSON::GeneratorError"),
+                    "partial character in source, but hit end");
+        }
+        if (!isLegalUTF8(source, extraBytesToRead+1)) {
+            rb_raise(rb_path2class("JSON::GeneratorError"),
+                    "source sequence is illegal/malformed utf-8");
+        }
+        /*
+         * The cases all fall through. See "Note A" below.
+         */
+        switch (extraBytesToRead) {
+            case 5: ch += *source++; ch <<= 6; /* remember, illegal UTF-8 */
+            case 4: ch += *source++; ch <<= 6; /* remember, illegal UTF-8 */
+            case 3: ch += *source++; ch <<= 6;
+            case 2: ch += *source++; ch <<= 6;
+            case 1: ch += *source++; ch <<= 6;
+            case 0: ch += *source++;
+        }
+        ch -= offsetsFromUTF8[extraBytesToRead];
+
+        if (ch <= UNI_MAX_BMP) { /* Target is a character <= 0xFFFF */
+            /* UTF-16 surrogate values are illegal in UTF-32 */
+            if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
+#if UNI_STRICT_CONVERSION
+                source -= (extraBytesToRead+1); /* return to the illegal value itself */
+                rb_raise(rb_path2class("JSON::GeneratorError"),
+                        "source sequence is illegal/malformed utf-8");
+#else
+                unicode_escape_to_buffer(buffer, buf, UNI_REPLACEMENT_CHAR);
+#endif
+            } else {
+                /* normal case */
+                if (ch >= 0x20 && ch <= 0x7f) {
+                    switch (ch) {
+                        case '\\':
+                            fbuffer_append(buffer, "\\\\", 2);
+                            break;
+                        case '"':
+                            fbuffer_append(buffer, "\\\"", 2);
+                            break;
+                        default:
+                            fbuffer_append_char(buffer, ch);
+                            break;
+                    }
+                } else {
+                    switch (ch) {
+                        case '\n':
+                            fbuffer_append(buffer, "\\n", 2);
+                            break;
+                        case '\r':
+                            fbuffer_append(buffer, "\\r", 2);
+                            break;
+                        case '\t':
+                            fbuffer_append(buffer, "\\t", 2);
+                            break;
+                        case '\f':
+                            fbuffer_append(buffer, "\\f", 2);
+                            break;
+                        case '\b':
+                            fbuffer_append(buffer, "\\b", 2);
+                            break;
+                        default:
+                            unicode_escape_to_buffer(buffer, buf, (UTF16) ch);
+                            break;
+                    }
+                }
+            }
+        } else if (ch > UNI_MAX_UTF16) {
+#if UNI_STRICT_CONVERSION
+            source -= (extraBytesToRead+1); /* return to the start */
+            rb_raise(rb_path2class("JSON::GeneratorError"),
+                    "source sequence is illegal/malformed utf8");
+#else
+            unicode_escape_to_buffer(buffer, buf, UNI_REPLACEMENT_CHAR);
+#endif
+        } else {
+            /* target is a character in range 0xFFFF - 0x10FFFF. */
+            ch -= halfBase;
+            unicode_escape_to_buffer(buffer, buf, (UTF16)((ch >> halfShift) + UNI_SUR_HIGH_START));
+            unicode_escape_to_buffer(buffer, buf, (UTF16)((ch & halfMask) + UNI_SUR_LOW_START));
+        }
+    }
+}
+
+/* Converts string to a JSON string in FBuffer buffer, where only the
+ * characters required by the JSON standard are JSON escaped. The remaining
+ * characters (should be UTF8) are just passed through and appended to the
+ * result. */
+static void convert_UTF8_to_JSON(FBuffer *buffer, VALUE string)
+{
+    const char *ptr = RSTRING_PTR(string), *p;
+    int len = RSTRING_LEN(string), start = 0, end = 0;
+    const char *escape = NULL;
+    int escape_len;
+    unsigned char c;
+    char buf[6] = { '\\', 'u' };
+
+    for (start = 0, end = 0; end < len;) {
+        p = ptr + end;
+        c = (unsigned char) *p;
+        if (c < 0x20) {
+            switch (c) {
+                case '\n':
+                    escape = "\\n";
+                    escape_len = 2;
+                    break;
+                case '\r':
+                    escape = "\\r";
+                    escape_len = 2;
+                    break;
+                case '\t':
+                    escape = "\\t";
+                    escape_len = 2;
+                    break;
+                case '\f':
+                    escape = "\\f";
+                    escape_len = 2;
+                    break;
+                case '\b':
+                    escape = "\\b";
+                    escape_len = 2;
+                    break;
+                default:
+                    unicode_escape(buf, (UTF16) *p);
+                    escape = buf;
+                    escape_len = 6;
+                    break;
+            }
+        } else {
+            switch (c) {
+                case '\\':
+                    escape = "\\\\";
+                    escape_len = 2;
+                    break;
+                case '"':
+                    escape =  "\\\"";
+                    escape_len = 2;
+                    break;
+                default:
+                    end++;
+                    continue;
+                    break;
+            }
+        }
+        fbuffer_append(buffer, ptr + start, end - start);
+        fbuffer_append(buffer, escape, escape_len);
+        start = ++end;
+        escape = NULL;
+    }
+    fbuffer_append(buffer, ptr + start, end - start);
+}
+
+static char *fstrndup(const char *ptr, int len) {
+  if (len <= 0) return NULL;
+  char *result = ALLOC_N(char, len);
+  memccpy(result, ptr, 0, len);
+  return result;
+}
+
+/* fbuffer implementation */
+
+static FBuffer *fbuffer_alloc()
+{
+    FBuffer *fb = ALLOC(FBuffer);
+    memset((void *) fb, 0, sizeof(FBuffer));
+    fb->initial_length = FBUFFER_INITIAL_LENGTH;
+    return fb;
+}
+
+static FBuffer *fbuffer_alloc_with_length(unsigned int initial_length)
+{
+    assert(initial_length > 0);
+    FBuffer *fb = ALLOC(FBuffer);
+    memset((void *) fb, 0, sizeof(FBuffer));
+    fb->initial_length = initial_length;
+    return fb;
+}
+
+static void fbuffer_free(FBuffer *fb)
+{
+    if (fb->ptr) ruby_xfree(fb->ptr);
+    ruby_xfree(fb);
+}
+
+static void fbuffer_free_only_buffer(FBuffer *fb)
+{
+    ruby_xfree(fb);
+}
+
+static void fbuffer_clear(FBuffer *fb)
+{
+    fb->len = 0;
+}
+
+static void fbuffer_inc_capa(FBuffer *fb, unsigned int requested)
+{
+    unsigned int required;
+
+    if (!fb->ptr) {
+        fb->ptr = ALLOC_N(char, fb->initial_length);
+        fb->capa = fb->initial_length;
+    }
+
+    for (required = fb->capa; requested > required - fb->len; required <<= 1);
+
+    if (required > fb->capa) {
+        fb->ptr = (char *) REALLOC_N((long*) fb->ptr, char, required);
+        fb->capa = required;
+    }
+}
+
+static void fbuffer_append(FBuffer *fb, const char *newstr, unsigned int len)
+{
+    if (len > 0) {
+        fbuffer_inc_capa(fb, len);
+        MEMCPY(fb->ptr + fb->len, newstr, char, len);
+        fb->len += len;
+    }
+}
+
+static void fbuffer_append_char(FBuffer *fb, char newchr)
+{
+    fbuffer_inc_capa(fb, 1);
+    *(fb->ptr + fb->len) = newchr;
+    fb->len++;
+}
+
+static void freverse(char *start, char *end)
+{
+	char c;
+
+	while (end > start) {
+		c = *end, *end-- = *start, *start++ = c;
+    }
+}
+
+static int fltoa(long number, char *buf)
+{
+	static char digits[] = "0123456789";
+	long sign = number;
+	char* tmp = buf;
+
+	if (sign < 0) number = -number;
+    do *tmp++ = digits[number % 10]; while (number /= 10);
+	if (sign < 0) *tmp++ = '-';
+	freverse(buf, tmp - 1);
+    return tmp - buf;
+}
+
+static void fbuffer_append_long(FBuffer *fb, long number)
+{
+    char buf[20];
+    int len = fltoa(number, buf);
+    fbuffer_append(fb, buf, len);
+}
+
+static FBuffer *fbuffer_dup(FBuffer *fb)
+{
+    int len = fb->len;
+    FBuffer *result;
+
+    if (len > 0) {
+        result = fbuffer_alloc_with_length(len);
+        fbuffer_append(result, FBUFFER_PAIR(fb));
+    } else {
+        result = fbuffer_alloc();
+    }
+    return result;
+}
+
+/* 
+ * Document-module: JSON::Ext::Generator
+ *
+ * This is the JSON generator implemented as a C extension. It can be
+ * configured to be used by setting
+ *
+ *  JSON.generator = JSON::Ext::Generator
+ *
+ * with the method generator= in JSON.
+ *
+ */
+
+/*
+ * call-seq: to_json(state = nil, depth = 0)
+ *
+ * Returns a JSON string containing a JSON object, that is generated from
+ * this Hash instance.
+ * _state_ is a JSON::State object, that can also be used to configure the
+ * produced JSON string output further.
+ * _depth_ is used to find out nesting depth, to indent accordingly.
+ */
+static VALUE mHash_to_json(int argc, VALUE *argv, VALUE self)
+{
+    VALUE state, depth;
+
+    rb_scan_args(argc, argv, "02", &state, &depth);
+    state = cState_from_state_s(cState, state);
+    return cState_partial_generate(state, self, depth);
+}
+
+/*
+ * call-seq: to_json(state = nil, depth = 0)
+ *
+ * Returns a JSON string containing a JSON array, that is generated from
+ * this Array instance.
+ * _state_ is a JSON::State object, that can also be used to configure the
+ * produced JSON string output further.
+ * _depth_ is used to find out nesting depth, to indent accordingly.
+ */
+static VALUE mArray_to_json(int argc, VALUE *argv, VALUE self) {
+    VALUE state, depth;
+    rb_scan_args(argc, argv, "02", &state, &depth);
+    state = cState_from_state_s(cState, state);
+    return cState_partial_generate(state, self, depth);
+}
+
+/*
+ * call-seq: to_json(*)
+ *
+ * Returns a JSON string representation for this Integer number.
+ */
+static VALUE mInteger_to_json(int argc, VALUE *argv, VALUE self)
+{
+    VALUE state, depth;
+    rb_scan_args(argc, argv, "02", &state, &depth);
+    state = cState_from_state_s(cState, state);
+    return cState_partial_generate(state, self, depth);
+}
+
+/*
+ * call-seq: to_json(*)
+ *
+ * Returns a JSON string representation for this Float number.
+ */
+static VALUE mFloat_to_json(int argc, VALUE *argv, VALUE self)
+{
+    VALUE state, depth;
+    rb_scan_args(argc, argv, "02", &state, &depth);
+    state = cState_from_state_s(cState, state);
+    return cState_partial_generate(state, self, depth);
+}
+
+/*
+ * call-seq: String.included(modul)
+ *
+ * Extends _modul_ with the String::Extend module.
+ */
+static VALUE mString_included_s(VALUE self, VALUE modul) {
+    VALUE result = rb_funcall(modul, i_extend, 1, mString_Extend);
+    return result;
+}
+
+/*
+ * call-seq: to_json(*)
+ *
+ * This string should be encoded with UTF-8 A call to this method
+ * returns a JSON string encoded with UTF16 big endian characters as
+ * \u????.
+ */
+static VALUE mString_to_json(int argc, VALUE *argv, VALUE self)
+{
+    VALUE state, depth;
+    rb_scan_args(argc, argv, "02", &state, &depth);
+    state = cState_from_state_s(cState, state);
+    return cState_partial_generate(state, self, depth);
+}
+
+/*
+ * call-seq: to_json_raw_object()
+ *
+ * This method creates a raw object hash, that can be nested into
+ * other data structures and will be generated as a raw string. This
+ * method should be used, if you want to convert raw strings to JSON
+ * instead of UTF-8 strings, e. g. binary data.
+ */
+static VALUE mString_to_json_raw_object(VALUE self)
+{
+    VALUE ary;
+    VALUE result = rb_hash_new();
+    rb_hash_aset(result, rb_funcall(mJSON, i_create_id, 0), rb_class_name(rb_obj_class(self)));
+    ary = rb_funcall(self, i_unpack, 1, rb_str_new2("C*"));
+    rb_hash_aset(result, rb_str_new2("raw"), ary);
+    return result;
+}
+
+/*
+ * call-seq: to_json_raw(*args)
+ *
+ * This method creates a JSON text from the result of a call to
+ * to_json_raw_object of this String.
+ */
+static VALUE mString_to_json_raw(int argc, VALUE *argv, VALUE self)
+{
+    VALUE obj = mString_to_json_raw_object(self);
+    Check_Type(obj, T_HASH);
+    return mHash_to_json(argc, argv, obj);
+}
+
+/*
+ * call-seq: json_create(o)
+ *
+ * Raw Strings are JSON Objects (the raw bytes are stored in an array for the
+ * key "raw"). The Ruby String can be created by this module method.
+ */
+static VALUE mString_Extend_json_create(VALUE self, VALUE o)
+{
+    VALUE ary;
+    Check_Type(o, T_HASH);
+    ary = rb_hash_aref(o, rb_str_new2("raw"));
+    return rb_funcall(ary, i_pack, 1, rb_str_new2("C*"));
+}
+
+/*
+ * call-seq: to_json(*)
+ *
+ * Returns a JSON string for true: 'true'.
+ */
+static VALUE mTrueClass_to_json(int argc, VALUE *argv, VALUE self)
+{
+    VALUE state, depth;
+    rb_scan_args(argc, argv, "02", &state, &depth);
+    state = cState_from_state_s(cState, state);
+    return cState_partial_generate(state, self, depth);
+}
+
+/*
+ * call-seq: to_json(*)
+ *
+ * Returns a JSON string for false: 'false'.
+ */
+static VALUE mFalseClass_to_json(int argc, VALUE *argv, VALUE self)
+{
+    VALUE state, depth;
+    rb_scan_args(argc, argv, "02", &state, &depth);
+    state = cState_from_state_s(cState, state);
+    return cState_partial_generate(state, self, depth);
+}
+
+/*
+ * call-seq: to_json(*)
+ *
+ */
+static VALUE mNilClass_to_json(int argc, VALUE *argv, VALUE self)
+{
+    VALUE state, depth;
+    rb_scan_args(argc, argv, "02", &state, &depth);
+    state = cState_from_state_s(cState, state);
+    return cState_partial_generate(state, self, depth);
+}
+
+/*
+ * call-seq: to_json(*)
+ *
+ * Converts this object to a string (calling #to_s), converts
+ * it to a JSON string, and returns the result. This is a fallback, if no
+ * special method #to_json was defined for some object.
+ */
+static VALUE mObject_to_json(int argc, VALUE *argv, VALUE self)
+{
+    VALUE state, depth;
+    VALUE string = rb_funcall(self, i_to_s, 0);
+    rb_scan_args(argc, argv, "02", &state, &depth);
+    Check_Type(string, T_STRING);
+    state = cState_from_state_s(cState, state);
+    return cState_partial_generate(state, string, depth);
+}
+
+static void State_free(JSON_Generator_State *state)
+{
+    if (state->indent) ruby_xfree(state->indent);
+    if (state->space) ruby_xfree(state->space);
+    if (state->space_before) ruby_xfree(state->space_before);
+    if (state->object_nl) ruby_xfree(state->object_nl);
+    if (state->array_nl) ruby_xfree(state->array_nl);
+    if (state->array_delim) fbuffer_free(state->array_delim);
+    if (state->object_delim) fbuffer_free(state->object_delim);
+    if (state->object_delim2) fbuffer_free(state->object_delim2);
+    ruby_xfree(state);
+}
+
+static JSON_Generator_State *State_allocate()
+{
+    JSON_Generator_State *state = ALLOC(JSON_Generator_State);
+    return state;
+}
+
+static VALUE cState_s_allocate(VALUE klass)
+{
+    JSON_Generator_State *state = State_allocate();
+    return Data_Wrap_Struct(klass, NULL, State_free, state);
+}
+
+/*
+ * call-seq: configure(opts)
+ *
+ * Configure this State instance with the Hash _opts_, and return
+ * itself.
+ */
+static VALUE cState_configure(VALUE self, VALUE opts)
+{
+    VALUE tmp;
+    GET_STATE(self);
+    tmp = rb_convert_type(opts, T_HASH, "Hash", "to_hash");
+    if (NIL_P(tmp)) tmp = rb_convert_type(opts, T_HASH, "Hash", "to_h");
+    if (NIL_P(tmp)) {
+        rb_raise(rb_eArgError, "opts has to be hash like or convertable into a hash");
+    }
+    opts = tmp;
+    tmp = rb_hash_aref(opts, ID2SYM(i_indent));
+    if (RTEST(tmp)) {
+        Check_Type(tmp, T_STRING);
+        int len = RSTRING_LEN(tmp);
+        state->indent = fstrndup(RSTRING_PTR(tmp), len);
+        state->indent_len = len;
+    }
+    tmp = rb_hash_aref(opts, ID2SYM(i_space));
+    if (RTEST(tmp)) {
+        Check_Type(tmp, T_STRING);
+        int len = RSTRING_LEN(tmp);
+        state->space = fstrndup(RSTRING_PTR(tmp), len);
+        state->space_len = len;
+    }
+    tmp = rb_hash_aref(opts, ID2SYM(i_space_before));
+    if (RTEST(tmp)) {
+        Check_Type(tmp, T_STRING);
+        int len = RSTRING_LEN(tmp);
+        state->space_before = fstrndup(RSTRING_PTR(tmp), len);
+        state->space_before_len = len;
+    }
+    tmp = rb_hash_aref(opts, ID2SYM(i_array_nl));
+    if (RTEST(tmp)) {
+        Check_Type(tmp, T_STRING);
+        int len = RSTRING_LEN(tmp);
+        state->array_nl = fstrndup(RSTRING_PTR(tmp), len);
+        state->array_nl_len = len;
+    }
+    tmp = rb_hash_aref(opts, ID2SYM(i_object_nl));
+    if (RTEST(tmp)) {
+        Check_Type(tmp, T_STRING);
+        int len = RSTRING_LEN(tmp);
+        state->object_nl = fstrndup(RSTRING_PTR(tmp), len);
+        state->object_nl_len = len;
+    }
+    tmp = ID2SYM(i_max_nesting);
+    state->max_nesting = 19;
+    if (option_given_p(opts, tmp)) {
+        VALUE max_nesting = rb_hash_aref(opts, tmp);
+        if (RTEST(max_nesting)) {
+            Check_Type(max_nesting, T_FIXNUM);
+            state->max_nesting = FIX2LONG(max_nesting);
+        } else {
+            state->max_nesting = 0;
+        }
+    }
+    tmp = rb_hash_aref(opts, ID2SYM(i_allow_nan));
+    state->allow_nan = RTEST(tmp);
+    tmp = rb_hash_aref(opts, ID2SYM(i_ascii_only));
+    state->ascii_only = RTEST(tmp);
+    return self;
+}
+
+/*
+ * call-seq: to_h
+ *
+ * Returns the configuration instance variables as a hash, that can be
+ * passed to the configure method.
+ */
+static VALUE cState_to_h(VALUE self)
+{
+    VALUE result = rb_hash_new();
+    GET_STATE(self);
+    rb_hash_aset(result, ID2SYM(i_indent), rb_str_new(state->indent, state->indent_len));
+    rb_hash_aset(result, ID2SYM(i_space), rb_str_new(state->space, state->space_len));
+    rb_hash_aset(result, ID2SYM(i_space_before), rb_str_new(state->space_before, state->space_before_len));
+    rb_hash_aset(result, ID2SYM(i_object_nl), rb_str_new(state->object_nl, state->object_nl_len));
+    rb_hash_aset(result, ID2SYM(i_array_nl), rb_str_new(state->array_nl, state->array_nl_len));
+    rb_hash_aset(result, ID2SYM(i_allow_nan), state->allow_nan ? Qtrue : Qfalse);
+    rb_hash_aset(result, ID2SYM(i_ascii_only), state->ascii_only ? Qtrue : Qfalse);
+    rb_hash_aset(result, ID2SYM(i_max_nesting), LONG2FIX(state->max_nesting));
+    return result;
+}
+
+/*
+* call-seq: [](name)
+*
+* Return the value returned by method +name+.
+*/
+static VALUE cState_aref(VALUE self, VALUE name)
+{
+    GET_STATE(self);
+    if (RTEST(rb_funcall(self, i_respond_to_p, 1, name))) {
+        return rb_funcall(self, i_send, 1, name);
+    } else {
+        return Qnil;
+    }
+}
+
+static void generate_json(FBuffer *buffer, VALUE Vstate, JSON_Generator_State *state, VALUE obj, long depth)
+{
+    VALUE tmp;
+    switch (TYPE(obj)) {
+        case T_HASH:
+            {
+                char *object_nl = state->object_nl;
+                long object_nl_len = state->object_nl_len;
+                char *indent = state->indent;
+                long indent_len = state->indent_len;
+                long max_nesting = state->max_nesting;
+                char *delim = FBUFFER_PTR(state->object_delim);
+                long delim_len = FBUFFER_LEN(state->object_delim);
+                char *delim2 = FBUFFER_PTR(state->object_delim2);
+                long delim2_len = FBUFFER_LEN(state->object_delim2);
+                int i, j;
+                depth++;
+                if (max_nesting != 0 && depth > max_nesting) {
+                    fbuffer_free(buffer);
+                    rb_raise(eNestingError, "nesting of %ld is too deep", depth);
+                }
+                fbuffer_append_char(buffer, '{');
+                VALUE keys = rb_funcall(obj, rb_intern("keys"), 0);
+                VALUE key, key_to_s;
+                for(i = 0; i < RARRAY_LEN(keys); i++) {
+                    if (i > 0) fbuffer_append(buffer, delim, delim_len);
+                    if (object_nl) {
+                        fbuffer_append(buffer, object_nl, object_nl_len);
+                    }
+                    if (indent) {
+                        for (j = 0; j < depth; j++) {
+                            fbuffer_append(buffer, indent, indent_len);
+                        }
+                    }
+                    key = rb_ary_entry(keys, i);
+                    key_to_s = rb_funcall(key, i_to_s, 0);
+                    Check_Type(key_to_s, T_STRING);
+                    generate_json(buffer, Vstate, state, key_to_s, depth);
+                    fbuffer_append(buffer, delim2, delim2_len);
+                    generate_json(buffer, Vstate, state, rb_hash_aref(obj, key), depth);
+                }
+                depth--;
+                if (object_nl) {
+                    fbuffer_append(buffer, object_nl, object_nl_len);
+                    if (indent) {
+                        for (j = 0; j < depth; j++) {
+                            fbuffer_append(buffer, indent, indent_len);
+                        }
+                    }
+                }
+                fbuffer_append_char(buffer, '}');
+            }
+            break;
+        case T_ARRAY:
+            {
+                char *array_nl = state->array_nl;
+                long array_nl_len = state->array_nl_len;
+                char *indent = state->indent;
+                long indent_len = state->indent_len;
+                long max_nesting = state->max_nesting;
+                char *delim = FBUFFER_PTR(state->array_delim);
+                long delim_len = FBUFFER_LEN(state->array_delim);
+                int i, j;
+                depth++;
+                if (max_nesting != 0 && depth > max_nesting) {
+                    fbuffer_free(buffer);
+                    rb_raise(eNestingError, "nesting of %ld is too deep", depth);
+                }
+                fbuffer_append_char(buffer, '[');
+                if (array_nl) fbuffer_append(buffer, array_nl, array_nl_len);
+                for(i = 0; i < RARRAY_LEN(obj); i++) {
+                    if (i > 0) fbuffer_append(buffer, delim, delim_len);
+                    if (indent) {
+                        for (j = 0; j < depth; j++) {
+                            fbuffer_append(buffer, indent, indent_len);
+                        }
+                    }
+                    generate_json(buffer, Vstate, state, rb_ary_entry(obj, i), depth);
+                }
+                depth--;
+                if (array_nl) {
+                    fbuffer_append(buffer, array_nl, array_nl_len);
+                    if (indent) {
+                        for (j = 0; j < depth; j++) {
+                            fbuffer_append(buffer, indent, indent_len);
+                        }
+                    }
+                }
+                fbuffer_append_char(buffer, ']');
+            }
+            break;
+        case T_STRING:
+            fbuffer_append_char(buffer, '"');
+#ifdef HAVE_RUBY_ENCODING_H
+            obj = rb_funcall(obj, i_encode, 1, CEncoding_UTF_8);
+#endif
+            if (state->ascii_only) {
+                convert_UTF8_to_JSON_ASCII(buffer, obj);
+            } else {
+                convert_UTF8_to_JSON(buffer, obj);
+            }
+            fbuffer_append_char(buffer, '"');
+            break;
+        case T_NIL:
+            fbuffer_append(buffer, "null", 4);
+            break;
+        case T_FALSE:
+            fbuffer_append(buffer, "false", 5);
+            break;
+        case T_TRUE:
+            fbuffer_append(buffer, "true", 4);
+            break;
+        case T_FIXNUM:
+            fbuffer_append_long(buffer, FIX2LONG(obj));
+            break;
+        case T_BIGNUM:
+            tmp = rb_funcall(obj, i_to_s, 0);
+            fbuffer_append(buffer, RSTRING_PAIR(tmp));
+            break;
+        case T_FLOAT:
+            {
+                double value = RFLOAT_VALUE(obj);
+                char allow_nan = state->allow_nan;
+                tmp = rb_funcall(obj, i_to_s, 0);
+                if (!allow_nan) {
+                    if (isinf(value)) {
+                        fbuffer_free(buffer);
+                        rb_raise(eGeneratorError, "%u: %s not allowed in JSON", __LINE__, StringValueCStr(tmp));
+                    } else if (isnan(value)) {
+                        fbuffer_free(buffer);
+                        rb_raise(eGeneratorError, "%u: %s not allowed in JSON", __LINE__, StringValueCStr(tmp));
+                    }
+                }
+                fbuffer_append(buffer, RSTRING_PAIR(tmp));
+            }
+            break;
+        default:
+            if (rb_respond_to(obj, i_to_json)) {
+                tmp = rb_funcall(obj, i_to_json, 2, Vstate, INT2FIX(depth + 1));
+                Check_Type(tmp, T_STRING);
+                fbuffer_append(buffer, RSTRING_PAIR(tmp));
+            } else {
+                tmp = rb_funcall(obj, i_to_s, 0);
+                Check_Type(tmp, T_STRING);
+                generate_json(buffer, Vstate, state, tmp, depth + 1);
+            }
+            break;
+    }
+}
+
+/*
+ * call-seq: partial_generate(obj)
+ *
+ * Generates a part of a JSON document from object +obj+ and returns the
+ * result.
+ */
+static VALUE cState_partial_generate(VALUE self, VALUE obj, VALUE depth)
+{
+    VALUE result;
+    FBuffer *buffer = fbuffer_alloc();
+    GET_STATE(self);
+
+    if (state->object_delim) {
+        fbuffer_clear(state->object_delim);
+    } else {
+        state->object_delim = fbuffer_alloc_with_length(16);
+    }
+    fbuffer_append_char(state->object_delim, ',');
+    if (state->object_delim2) {
+        fbuffer_clear(state->object_delim2);
+    } else {
+        state->object_delim2 = fbuffer_alloc_with_length(16);
+    }
+    fbuffer_append_char(state->object_delim2, ':');
+    if (state->space) fbuffer_append(state->object_delim2, state->space, state->space_len);
+
+    if (state->array_delim) {
+        fbuffer_clear(state->array_delim);
+    } else {
+        state->array_delim = fbuffer_alloc_with_length(16);
+    }
+    fbuffer_append_char(state->array_delim, ',');
+    if (state->array_nl) fbuffer_append(state->array_delim, state->array_nl, state->array_nl_len);
+
+    generate_json(buffer, self, state, obj, NIL_P(depth) ? 0 : FIX2INT(depth));
+    result = rb_str_new(FBUFFER_PAIR(buffer));
+    fbuffer_free_only_buffer(buffer);
+    FORCE_UTF8(result);
+    return result;
+}
+
+/*
+ * call-seq: generate(obj)
+ *
+ * Generates a valid JSON document from object +obj+ and returns the
+ * result. If no valid JSON document can be created this method raises a
+ * GeneratorError exception.
+ */
+static VALUE cState_generate(VALUE self, VALUE obj)
+{
+    VALUE result = cState_partial_generate(self, obj, Qnil);
+    VALUE re, args[2];
+    args[0] = rb_str_new2("\\A\\s*(?:\\[.*\\]|\\{.*\\})\\s*\\Z");
+    args[1] = CRegexp_MULTILINE;
+    re = rb_class_new_instance(2, args, rb_cRegexp);
+    if (NIL_P(rb_funcall(re, i_match, 1, result))) {
+        rb_raise(eGeneratorError, "only generation of JSON objects or arrays allowed");
+    }
+    return result;
+}
+
+/*
+ * call-seq: new(opts = {})
+ *
+ * Instantiates a new State object, configured by _opts_.
+ *
+ * _opts_ can have the following keys:
+ *
+ * * *indent*: a string used to indent levels (default: ''),
+ * * *space*: a string that is put after, a : or , delimiter (default: ''),
+ * * *space_before*: a string that is put before a : pair delimiter (default: ''),
+ * * *object_nl*: a string that is put at the end of a JSON object (default: ''), 
+ * * *array_nl*: a string that is put at the end of a JSON array (default: ''),
+ * * *allow_nan*: true if NaN, Infinity, and -Infinity should be
+ *   generated, otherwise an exception is thrown, if these values are
+ *   encountered. This options defaults to false.
+ */
+static VALUE cState_initialize(int argc, VALUE *argv, VALUE self)
+{
+    VALUE opts;
+    GET_STATE(self);
+    MEMZERO(state, JSON_Generator_State, 1);
+    state->max_nesting = 19;
+    rb_scan_args(argc, argv, "01", &opts);
+    if (!NIL_P(opts)) cState_configure(self, opts);
+    return self;
+}
+
+/*
+ * call-seq: initialize_copy(orig)
+ *
+ * Initializes this object from orig if it to be duplicated/cloned and returns
+ * it.
+*/
+static VALUE cState_init_copy(VALUE obj, VALUE orig)
+{
+    JSON_Generator_State *objState, *origState;
+
+    Data_Get_Struct(obj, JSON_Generator_State, objState);
+    Data_Get_Struct(orig, JSON_Generator_State, origState);
+    if (!objState) rb_raise(rb_eArgError, "unallocated JSON::State");
+
+    MEMCPY(objState, origState, JSON_Generator_State, 1);
+    objState->indent = fstrndup(origState->indent, origState->indent_len);
+    objState->space = fstrndup(origState->space, origState->space_len);
+    objState->space_before = fstrndup(origState->space_before, origState->space_before_len);
+    objState->object_nl = fstrndup(origState->object_nl, origState->object_nl_len);
+    objState->array_nl = fstrndup(origState->array_nl, origState->array_nl_len);
+    if (origState->array_delim) objState->array_delim = fbuffer_dup(origState->array_delim);
+    if (origState->object_delim) objState->object_delim = fbuffer_dup(origState->object_delim);
+    if (origState->object_delim2) objState->object_delim2 = fbuffer_dup(origState->object_delim2);
+    return obj;
+}
+
+/*
+ * call-seq: from_state(opts)
+ *
+ * Creates a State object from _opts_, which ought to be Hash to create a
+ * new State instance configured by _opts_, something else to create an
+ * unconfigured instance. If _opts_ is a State object, it is just returned.
+ */
+static VALUE cState_from_state_s(VALUE self, VALUE opts)
+{
+    if (rb_obj_is_kind_of(opts, self)) {
+        return opts;
+    } else if (rb_obj_is_kind_of(opts, rb_cHash)) {
+        return rb_funcall(self, i_new, 1, opts);
+    } else {
+        if (NIL_P(CJSON_SAFE_STATE_PROTOTYPE)) {
+            CJSON_SAFE_STATE_PROTOTYPE = rb_const_get(mJSON, rb_intern("SAFE_STATE_PROTOTYPE"));
+        }
+        return CJSON_SAFE_STATE_PROTOTYPE;
+    }
+}
+
+/*
+ * call-seq: indent()
+ *
+ * This string is used to indent levels in the JSON text.
+ */
+static VALUE cState_indent(VALUE self)
+{
+    GET_STATE(self);
+    return state->indent ? rb_str_new2(state->indent) : rb_str_new2("");
+}
+
+/*
+ * call-seq: indent=(indent)
+ *
+ * This string is used to indent levels in the JSON text.
+ */
+static VALUE cState_indent_set(VALUE self, VALUE indent)
+{
+    GET_STATE(self);
+    Check_Type(indent, T_STRING);
+    if (RSTRING_LEN(indent) == 0) {
+        if (state->indent) {
+            ruby_xfree(state->indent);
+            state->indent = NULL;
+        }
+    } else {
+        if (state->indent) ruby_xfree(state->indent);
+        state->indent = strdup(RSTRING_PTR(indent));
+    }
+    return Qnil;
+}
+
+/*
+ * call-seq: space()
+ *
+ * This string is used to insert a space between the tokens in a JSON
+ * string.
+ */
+static VALUE cState_space(VALUE self)
+{
+    GET_STATE(self);
+    return state->space ? rb_str_new2(state->space) : rb_str_new2("");
+}
+
+/*
+ * call-seq: space=(space)
+ *
+ * This string is used to insert a space between the tokens in a JSON
+ * string.
+ */
+static VALUE cState_space_set(VALUE self, VALUE space)
+{
+    GET_STATE(self);
+    Check_Type(space, T_STRING);
+    if (RSTRING_LEN(space) == 0) {
+        if (state->space) {
+            ruby_xfree(state->space);
+            state->space = NULL;
+        }
+    } else {
+        if (state->space) ruby_xfree(state->space);
+        state->space = strdup(RSTRING_PTR(space));
+    }
+    return Qnil;
+}
+
+/*
+ * call-seq: space_before()
+ *
+ * This string is used to insert a space before the ':' in JSON objects.
+ */
+static VALUE cState_space_before(VALUE self)
+{
+    GET_STATE(self);
+    return state->space_before ? rb_str_new2(state->space_before) : rb_str_new2("");
+}
+
+/*
+ * call-seq: space_before=(space_before)
+ *
+ * This string is used to insert a space before the ':' in JSON objects.
+ */
+static VALUE cState_space_before_set(VALUE self, VALUE space_before)
+{
+    GET_STATE(self);
+    Check_Type(space_before, T_STRING);
+    if (RSTRING_LEN(space_before) == 0) {
+        if (state->space_before) {
+            ruby_xfree(state->space_before);
+            state->space_before = NULL;
+        }
+    } else {
+        if (state->space_before) ruby_xfree(state->space_before);
+        state->space_before = strdup(RSTRING_PTR(space_before));
+    }
+    return Qnil;
+}
+
+/*
+ * call-seq: object_nl()
+ *
+ * This string is put at the end of a line that holds a JSON object (or
+ * Hash).
+ */
+static VALUE cState_object_nl(VALUE self)
+{
+    GET_STATE(self);
+    return state->object_nl ? rb_str_new2(state->object_nl) : rb_str_new2("");
+}
+
+/*
+ * call-seq: object_nl=(object_nl)
+ *
+ * This string is put at the end of a line that holds a JSON object (or
+ * Hash).
+ */
+static VALUE cState_object_nl_set(VALUE self, VALUE object_nl)
+{
+    GET_STATE(self);
+    Check_Type(object_nl, T_STRING);
+    if (RSTRING_LEN(object_nl) == 0) {
+        if (state->object_nl) {
+            ruby_xfree(state->object_nl);
+            state->object_nl = NULL;
+        }
+    } else {
+        if (state->object_nl) ruby_xfree(state->object_nl);
+        state->object_nl = strdup(RSTRING_PTR(object_nl));
+    }
+    return Qnil;
+}
+
+/*
+ * call-seq: array_nl()
+ *
+ * This string is put at the end of a line that holds a JSON array.
+ */
+static VALUE cState_array_nl(VALUE self)
+{
+    GET_STATE(self);
+    return state->array_nl ? rb_str_new2(state->array_nl) : rb_str_new2("");
+}
+
+/*
+ * call-seq: array_nl=(array_nl)
+ *
+ * This string is put at the end of a line that holds a JSON array.
+ */
+static VALUE cState_array_nl_set(VALUE self, VALUE array_nl)
+{
+    GET_STATE(self);
+    Check_Type(array_nl, T_STRING);
+    if (RSTRING_LEN(array_nl) == 0) {
+        if (state->array_nl) {
+            ruby_xfree(state->array_nl);
+            state->array_nl = NULL;
+        }
+    } else {
+        if (state->array_nl) ruby_xfree(state->array_nl);
+        state->array_nl = strdup(RSTRING_PTR(array_nl));
+    }
+    return Qnil;
+}
+
+
+/*
+* call-seq: check_circular?
+*
+* Returns true, if circular data structures should be checked,
+* otherwise returns false.
+*/
+static VALUE cState_check_circular_p(VALUE self)
+{
+    GET_STATE(self);
+    return state->max_nesting ? Qtrue : Qfalse;
+}
+
+/*
+ * call-seq: max_nesting
+ *
+ * This integer returns the maximum level of data structure nesting in
+ * the generated JSON, max_nesting = 0 if no maximum is checked.
+ */
+static VALUE cState_max_nesting(VALUE self)
+{
+    GET_STATE(self);
+    return LONG2FIX(state->max_nesting);
+}
+
+/*
+ * call-seq: max_nesting=(depth)
+ *
+ * This sets the maximum level of data structure nesting in the generated JSON
+ * to the integer depth, max_nesting = 0 if no maximum should be checked.
+ */
+static VALUE cState_max_nesting_set(VALUE self, VALUE depth)
+{
+    GET_STATE(self);
+    Check_Type(depth, T_FIXNUM);
+    return state->max_nesting = FIX2LONG(depth);
+}
+
+/*
+ * call-seq: allow_nan?
+ *
+ * Returns true, if NaN, Infinity, and -Infinity should be generated, otherwise
+ * returns false.
+ */
+static VALUE cState_allow_nan_p(VALUE self)
+{
+    GET_STATE(self);
+    return state->allow_nan ? Qtrue : Qfalse;
+}
+
+/*
+ * call-seq: ascii_only?
+ *
+ * Returns true, if NaN, Infinity, and -Infinity should be generated, otherwise
+ * returns false.
+ */
+static VALUE cState_ascii_only_p(VALUE self)
+{
+    GET_STATE(self);
+    return state->ascii_only ? Qtrue : Qfalse;
+}
+
+/*
+ *
+ */
+void Init_generator()
+{
+    rb_require("json/common");
+
+    mJSON = rb_define_module("JSON");
+    mExt = rb_define_module_under(mJSON, "Ext");
+    mGenerator = rb_define_module_under(mExt, "Generator");
+
+    eGeneratorError = rb_path2class("JSON::GeneratorError");
+    eNestingError = rb_path2class("JSON::NestingError");
+
+    cState = rb_define_class_under(mGenerator, "State", rb_cObject);
+    rb_define_alloc_func(cState, cState_s_allocate);
+    rb_define_singleton_method(cState, "from_state", cState_from_state_s, 1);
+    rb_define_method(cState, "initialize", cState_initialize, -1);
+    rb_define_method(cState, "initialize_copy", cState_init_copy, 1);
+    rb_define_method(cState, "indent", cState_indent, 0);
+    rb_define_method(cState, "indent=", cState_indent_set, 1);
+    rb_define_method(cState, "space", cState_space, 0);
+    rb_define_method(cState, "space=", cState_space_set, 1);
+    rb_define_method(cState, "space_before", cState_space_before, 0);
+    rb_define_method(cState, "space_before=", cState_space_before_set, 1);
+    rb_define_method(cState, "object_nl", cState_object_nl, 0);
+    rb_define_method(cState, "object_nl=", cState_object_nl_set, 1);
+    rb_define_method(cState, "array_nl", cState_array_nl, 0);
+    rb_define_method(cState, "array_nl=", cState_array_nl_set, 1);
+    rb_define_method(cState, "max_nesting", cState_max_nesting, 0);
+    rb_define_method(cState, "max_nesting=", cState_max_nesting_set, 1);
+    rb_define_method(cState, "check_circular?", cState_check_circular_p, 0);
+    rb_define_method(cState, "allow_nan?", cState_allow_nan_p, 0);
+    rb_define_method(cState, "ascii_only?", cState_ascii_only_p, 0);
+    rb_define_method(cState, "configure", cState_configure, 1);
+    rb_define_method(cState, "to_h", cState_to_h, 0);
+    rb_define_method(cState, "[]", cState_aref, 1);
+    rb_define_method(cState, "generate", cState_generate, 1);
+    rb_define_method(cState, "partial_generate", cState_partial_generate, 1);
+
+    mGeneratorMethods = rb_define_module_under(mGenerator, "GeneratorMethods");
+    mObject = rb_define_module_under(mGeneratorMethods, "Object");
+    rb_define_method(mObject, "to_json", mObject_to_json, -1);
+    mHash = rb_define_module_under(mGeneratorMethods, "Hash");
+    rb_define_method(mHash, "to_json", mHash_to_json, -1);
+    mArray = rb_define_module_under(mGeneratorMethods, "Array");
+    rb_define_method(mArray, "to_json", mArray_to_json, -1);
+    mInteger = rb_define_module_under(mGeneratorMethods, "Integer");
+    rb_define_method(mInteger, "to_json", mInteger_to_json, -1);
+    mFloat = rb_define_module_under(mGeneratorMethods, "Float");
+    rb_define_method(mFloat, "to_json", mFloat_to_json, -1);
+    mString = rb_define_module_under(mGeneratorMethods, "String");
+    rb_define_singleton_method(mString, "included", mString_included_s, 1);
+    rb_define_method(mString, "to_json", mString_to_json, -1);
+    rb_define_method(mString, "to_json_raw", mString_to_json_raw, -1);
+    rb_define_method(mString, "to_json_raw_object", mString_to_json_raw_object, 0);
+    mString_Extend = rb_define_module_under(mString, "Extend");
+    rb_define_method(mString_Extend, "json_create", mString_Extend_json_create, 1);
+    mTrueClass = rb_define_module_under(mGeneratorMethods, "TrueClass");
+    rb_define_method(mTrueClass, "to_json", mTrueClass_to_json, -1);
+    mFalseClass = rb_define_module_under(mGeneratorMethods, "FalseClass");
+    rb_define_method(mFalseClass, "to_json", mFalseClass_to_json, -1);
+    mNilClass = rb_define_module_under(mGeneratorMethods, "NilClass");
+    rb_define_method(mNilClass, "to_json", mNilClass_to_json, -1);
+
+    CRegexp_MULTILINE = rb_const_get(rb_cRegexp, rb_intern("MULTILINE"));
+    i_to_s = rb_intern("to_s");
+    i_to_json = rb_intern("to_json");
+    i_new = rb_intern("new");
+    i_indent = rb_intern("indent");
+    i_space = rb_intern("space");
+    i_space_before = rb_intern("space_before");
+    i_object_nl = rb_intern("object_nl");
+    i_array_nl = rb_intern("array_nl");
+    i_max_nesting = rb_intern("max_nesting");
+    i_allow_nan = rb_intern("allow_nan");
+    i_ascii_only = rb_intern("ascii_only");
+    i_pack = rb_intern("pack");
+    i_unpack = rb_intern("unpack");
+    i_create_id = rb_intern("create_id");
+    i_extend = rb_intern("extend");
+    i_key_p = rb_intern("key?");
+    i_aref = rb_intern("[]");
+    i_send = rb_intern("__send__");
+    i_respond_to_p = rb_intern("respond_to?");
+    i_match = rb_intern("match");
+#ifdef HAVE_RUBY_ENCODING_H
+    CEncoding_UTF_8 = rb_funcall(rb_path2class("Encoding"), rb_intern("find"), 1, rb_str_new2("utf-8"));
+    i_encoding = rb_intern("encoding");
+    i_encode = rb_intern("encode");
+#endif
+    CJSON_SAFE_STATE_PROTOTYPE = Qnil;
+}
diff --git a/ext/json/generator/generator.h b/ext/json/generator/generator.h
new file mode 100644
index 0000000000..37240a9c6b
--- /dev/null
+++ b/ext/json/generator/generator.h
@@ -0,0 +1,170 @@
+#ifndef _GENERATOR_H_
+#define _GENERATOR_H_
+
+#include <string.h>
+#include <assert.h>
+#include <math.h>
+
+#include "ruby.h"
+
+#if HAVE_RUBY_RE_H
+#include "ruby/re.h"
+#endif
+
+#if HAVE_RE_H
+#include "re.h"
+#endif
+
+#ifdef HAVE_RUBY_ENCODING_H
+#include "ruby/encoding.h"
+#define FORCE_UTF8(obj) rb_enc_associate((obj), rb_utf8_encoding())
+#else
+#define FORCE_UTF8(obj)
+#endif
+
+#define option_given_p(opts, key) RTEST(rb_funcall(opts, i_key_p, 1, key))
+
+#ifndef RHASH_SIZE
+#define RHASH_SIZE(hsh) (RHASH(hsh)->tbl->num_entries)
+#endif
+
+#ifndef RFLOAT_VALUE
+#define RFLOAT_VALUE(val) (RFLOAT(val)->value)
+#endif
+
+#ifndef RARRAY_PTR
+#define RARRAY_PTR(ARRAY) RARRAY(ARRAY)->ptr
+#endif
+#ifndef RARRAY_LEN
+#define RARRAY_LEN(ARRAY) RARRAY(ARRAY)->len
+#endif
+#ifndef RSTRING_PTR
+#define RSTRING_PTR(string) RSTRING(string)->ptr
+#endif
+#ifndef RSTRING_LEN
+#define RSTRING_LEN(string) RSTRING(string)->len
+#endif
+
+#define RSTRING_PAIR(string) RSTRING_PTR(string), RSTRING_LEN(string)
+
+/* fbuffer implementation */
+
+typedef struct FBufferStruct {
+    unsigned int initial_length;
+    char *ptr;
+    unsigned int len;
+    unsigned int capa;
+} FBuffer;
+
+#define FBUFFER_INITIAL_LENGTH 4096
+
+#define FBUFFER_PTR(fb) (fb->ptr)
+#define FBUFFER_LEN(fb) (fb->len)
+#define FBUFFER_CAPA(fb) (fb->capa)
+#define FBUFFER_PAIR(fb) FBUFFER_PTR(fb), FBUFFER_LEN(fb)
+
+static char *fstrndup(const char *ptr, int len);
+static FBuffer *fbuffer_alloc();
+static FBuffer *fbuffer_alloc_with_length(unsigned initial_length);
+static void fbuffer_free(FBuffer *fb);
+static void fbuffer_free_only_buffer(FBuffer *fb);
+static void fbuffer_clear(FBuffer *fb);
+static void fbuffer_append(FBuffer *fb, const char *newstr, unsigned int len);
+static void fbuffer_append_long(FBuffer *fb, long number);
+static void fbuffer_append_char(FBuffer *fb, char newchr);
+static FBuffer *fbuffer_dup(FBuffer *fb);
+
+/* unicode defintions */
+
+#define UNI_STRICT_CONVERSION 1
+
+typedef unsigned long	UTF32;	/* at least 32 bits */
+typedef unsigned short	UTF16;	/* at least 16 bits */
+typedef unsigned char	UTF8;	/* typically 8 bits */
+
+#define UNI_REPLACEMENT_CHAR (UTF32)0x0000FFFD
+#define UNI_MAX_BMP (UTF32)0x0000FFFF
+#define UNI_MAX_UTF16 (UTF32)0x0010FFFF
+#define UNI_MAX_UTF32 (UTF32)0x7FFFFFFF
+#define UNI_MAX_LEGAL_UTF32 (UTF32)0x0010FFFF
+
+#define UNI_SUR_HIGH_START  (UTF32)0xD800
+#define UNI_SUR_HIGH_END    (UTF32)0xDBFF
+#define UNI_SUR_LOW_START   (UTF32)0xDC00
+#define UNI_SUR_LOW_END     (UTF32)0xDFFF
+
+static const int halfShift  = 10; /* used for shifting by 10 bits */
+
+static const UTF32 halfBase = 0x0010000UL;
+static const UTF32 halfMask = 0x3FFUL;
+
+static unsigned char isLegalUTF8(const UTF8 *source, int length);
+static void unicode_escape(char *buf, UTF16 character);
+static void unicode_escape_to_buffer(FBuffer *buffer, char buf[6], UTF16 character);
+static void convert_UTF8_to_JSON_ASCII(FBuffer *buffer, VALUE string);
+static void convert_UTF8_to_JSON(FBuffer *buffer, VALUE string);
+
+/* ruby api and some helpers */
+
+typedef struct JSON_Generator_StateStruct {
+    char *indent;
+    long indent_len;
+    char *space;
+    long space_len;
+    char *space_before;
+    long space_before_len;
+    char *object_nl;
+    long object_nl_len;
+    char *array_nl;
+    long array_nl_len;
+    FBuffer *array_delim;
+    FBuffer *object_delim;
+    FBuffer *object_delim2;
+    long max_nesting;
+    char allow_nan;
+    char ascii_only;
+} JSON_Generator_State;
+
+#define GET_STATE(self)                       \
+    JSON_Generator_State *state;              \
+    Data_Get_Struct(self, JSON_Generator_State, state)
+
+static VALUE mHash_to_json(int argc, VALUE *argv, VALUE self);
+static VALUE mArray_to_json(int argc, VALUE *argv, VALUE self);
+static VALUE mInteger_to_json(int argc, VALUE *argv, VALUE self);
+static VALUE mFloat_to_json(int argc, VALUE *argv, VALUE self);
+static VALUE mString_included_s(VALUE self, VALUE modul);
+static VALUE mString_to_json(int argc, VALUE *argv, VALUE self);
+static VALUE mString_to_json_raw_object(VALUE self);
+static VALUE mString_to_json_raw(int argc, VALUE *argv, VALUE self);
+static VALUE mString_Extend_json_create(VALUE self, VALUE o);
+static VALUE mTrueClass_to_json(int argc, VALUE *argv, VALUE self);
+static VALUE mFalseClass_to_json(int argc, VALUE *argv, VALUE self);
+static VALUE mNilClass_to_json(int argc, VALUE *argv, VALUE self);
+static VALUE mObject_to_json(int argc, VALUE *argv, VALUE self);
+static void State_free(JSON_Generator_State *state);
+static JSON_Generator_State *State_allocate();
+static VALUE cState_s_allocate(VALUE klass);
+static VALUE cState_configure(VALUE self, VALUE opts);
+static VALUE cState_to_h(VALUE self);
+static void generate_json(FBuffer *buffer, VALUE Vstate, JSON_Generator_State *state, VALUE obj, long depth);
+static VALUE cState_partial_generate(VALUE self, VALUE obj, VALUE depth);
+static VALUE cState_generate(VALUE self, VALUE obj);
+static VALUE cState_initialize(int argc, VALUE *argv, VALUE self);
+static VALUE cState_from_state_s(VALUE self, VALUE opts);
+static VALUE cState_indent(VALUE self);
+static VALUE cState_indent_set(VALUE self, VALUE indent);
+static VALUE cState_space(VALUE self);
+static VALUE cState_space_set(VALUE self, VALUE space);
+static VALUE cState_space_before(VALUE self);
+static VALUE cState_space_before_set(VALUE self, VALUE space_before);
+static VALUE cState_object_nl(VALUE self);
+static VALUE cState_object_nl_set(VALUE self, VALUE object_nl);
+static VALUE cState_array_nl(VALUE self);
+static VALUE cState_array_nl_set(VALUE self, VALUE array_nl);
+static VALUE cState_max_nesting(VALUE self);
+static VALUE cState_max_nesting_set(VALUE self, VALUE depth);
+static VALUE cState_allow_nan_p(VALUE self);
+static VALUE cState_ascii_only_p(VALUE self);
+
+#endif