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#include <ruby.h>
#include <yajl/yajl_parse.h>
#ifdef HAVE_RUBY_ENCODING_H
#include <ruby/encoding.h>
static rb_encoding *utf8Encoding;
#endif
static VALUE mFFI_Yajl, mExt, mParser, cParseError;
typedef struct {
VALUE finished;
VALUE stack;
VALUE key_stack;
VALUE key;
} CTX;
void set_value(CTX *ctx, VALUE val) {
long len = RARRAY_LEN(ctx->stack);
VALUE last = rb_ary_entry(ctx->stack, len-1);
switch (TYPE(last)) {
case T_ARRAY:
rb_ary_push(last, val);
break;
case T_HASH:
rb_hash_aset(last, ctx->key, val);
break;
default:
break;
}
}
void set_key(CTX *ctx, VALUE key) {
ctx->key = key;
}
void start_object(CTX *ctx, VALUE obj) {
rb_ary_push(ctx->key_stack, ctx->key);
rb_ary_push(ctx->stack, obj);
}
void end_object(CTX *ctx) {
ctx->key = rb_ary_pop(ctx->key_stack);
if ( RARRAY_LEN(ctx->stack) > 1 ) {
set_value(ctx, rb_ary_pop(ctx->stack));
} else {
ctx->finished = rb_ary_pop(ctx->stack);
}
}
int null_callback(void *ctx) {
set_value(ctx, Qnil);
return 1;
}
int boolean_callback(void *ctx, int boolean) {
set_value(ctx, boolean ? Qtrue : Qfalse);
return 1;
}
int integer_callback(void *ctx, long long intVal) {
set_value(ctx, LONG2NUM(intVal));
return 1;
}
int double_callback(void *ctx, double doubleVal) {
set_value(ctx, rb_float_new(doubleVal));
return 1;
}
int number_callback(void *ctx, const char *numberVal, size_t numberLen) {
char buf[numberLen+1];
buf[numberLen] = 0;
memcpy(buf, numberVal, numberLen);
if (memchr(buf, '.', numberLen) ||
memchr(buf, 'e', numberLen) ||
memchr(buf, 'E', numberLen)) {
set_value(ctx, rb_float_new(strtod(buf, NULL)));
} else {
set_value(ctx, rb_cstr2inum(buf, 10));
}
return 1;
}
int string_callback(void *ctx, const unsigned char *stringVal, size_t stringLen) {
char buf[stringLen+1];
VALUE str;
#ifdef HAVE_RUBY_ENCODING_H
rb_encoding *default_internal_enc;
#endif
buf[stringLen] = 0;
memcpy(buf, stringVal, stringLen);
str = rb_str_new2(buf);
#ifdef HAVE_RUBY_ENCODING_H
default_internal_enc = rb_default_internal_encoding();
rb_enc_associate(str, utf8Encoding);
if (default_internal_enc) {
str = rb_str_export_to_enc(str, default_internal_enc);
}
#endif
set_value(ctx,str);
return 1;
}
int start_map_callback(void *ctx) {
start_object(ctx,rb_hash_new());
return 1;
}
int map_key_callback(void *ctx, const unsigned char *stringVal, size_t stringLen) {
char buf[stringLen+1];
VALUE str;
#ifdef HAVE_RUBY_ENCODING_H
rb_encoding *default_internal_enc;
#endif
buf[stringLen] = 0;
memcpy(buf, stringVal, stringLen);
str = rb_str_new2(buf);
#ifdef HAVE_RUBY_ENCODING_H
default_internal_enc = rb_default_internal_encoding();
rb_enc_associate(str, utf8Encoding);
if (default_internal_enc) {
str = rb_str_export_to_enc(str, default_internal_enc);
}
#endif
set_key(ctx,str);
return 1;
}
int end_map_callback(void *ctx) {
end_object(ctx);
return 1;
}
int start_array_callback(void *ctx) {
start_object(ctx,rb_ary_new());
return 1;
}
int end_array_callback(void *ctx) {
end_object(ctx);
return 1;
}
static yajl_callbacks callbacks = {
null_callback,
boolean_callback,
integer_callback,
double_callback,
number_callback,
string_callback,
start_map_callback,
map_key_callback,
end_map_callback,
start_array_callback,
end_array_callback,
};
static VALUE mParser_do_yajl_parse(VALUE self, VALUE str, VALUE opts) {
yajl_handle hand;
yajl_status stat;
unsigned char *err;
CTX ctx;
ctx.stack = rb_ary_new();
ctx.key_stack = rb_ary_new();
/* hack to avoid garbage collection */
rb_ivar_set(self, rb_intern("stack"), ctx.stack);
rb_ivar_set(self, rb_intern("key_stack"), ctx.key_stack);
hand = yajl_alloc(&callbacks, NULL, &ctx);
if ((stat = yajl_parse(hand, (unsigned char *)RSTRING_PTR(str), RSTRING_LEN(str))) != yajl_status_ok) {
err = yajl_get_error(hand, 1, (unsigned char *)RSTRING_PTR(str), RSTRING_LEN(str));
goto raise;
}
if ((stat = yajl_complete_parse(hand)) != yajl_status_ok) {
err = yajl_get_error(hand, 1, (unsigned char *)RSTRING_PTR(str), RSTRING_LEN(str));
goto raise;
}
yajl_free(hand);
return ctx.finished;
raise:
if (hand) {
yajl_free(hand);
}
rb_raise(cParseError, "%s", err);
}
void Init_parser() {
mFFI_Yajl = rb_define_module("FFI_Yajl");
cParseError = rb_define_class_under(mFFI_Yajl, "ParseError", rb_eStandardError);
mExt = rb_define_module_under(mFFI_Yajl, "Ext");
mParser = rb_define_module_under(mExt, "Parser");
rb_define_method(mParser, "do_yajl_parse", mParser_do_yajl_parse, 2);
#ifdef HAVE_RUBY_ENCODING_H
utf8Encoding = rb_utf8_encoding();
#endif
}
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