/
yajl_ext.c
1372 lines (1190 loc) · 45.6 KB
/
yajl_ext.c
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/*
* Copyright (c) 2008-2011 Brian Lopez - http://github.com/brianmario
*
* 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.
*/
#include "yajl_ext.h"
#include "yajl_lex.h"
#include "yajl_alloc.h"
#include "yajl_buf.h"
#include "yajl_encode.h"
#include "api/yajl_common.h"
#include "assert.h"
#define YAJL_RB_TO_JSON \
VALUE rb_encoder, cls; \
rb_scan_args(argc, argv, "01", &rb_encoder); \
cls = rb_obj_class(rb_encoder); \
if (rb_encoder == Qnil || cls != cEncoder) { \
rb_encoder = rb_yajl_encoder_new(0, NULL, cEncoder); \
} \
return rb_yajl_encoder_encode(1, &self, rb_encoder); \
static void *rb_internal_malloc(void *ctx, unsigned int sz) {
return xmalloc(sz);
}
static void *rb_internal_realloc(void *ctx, void *previous, unsigned int sz) {
return xrealloc(previous, sz);
}
static void rb_internal_free(void *ctx, void *ptr) {
xfree(ptr);
}
static yajl_alloc_funcs rb_alloc_funcs = {
rb_internal_malloc,
rb_internal_realloc,
rb_internal_free,
NULL
};
/* Helpers for building objects */
static void yajl_check_and_fire_callback(void * ctx) {
yajl_parser_wrapper * wrapper;
GetParser((VALUE)ctx, wrapper);
/* No need to do any of this if the callback isn't even setup */
if (wrapper->parse_complete_callback != Qnil) {
long len = RARRAY_LEN(wrapper->builderStack);
if (len == 1 && wrapper->nestedArrayLevel == 0 && wrapper->nestedHashLevel == 0) {
rb_funcall(wrapper->parse_complete_callback, intern_call, 1, rb_ary_pop(wrapper->builderStack));
}
} else {
long len = RARRAY_LEN(wrapper->builderStack);
if (len == 1 && wrapper->nestedArrayLevel == 0 && wrapper->nestedHashLevel == 0) {
wrapper->objectsFound++;
if (wrapper->objectsFound > 1) {
rb_raise(cParseError, "%s", "Found multiple JSON objects in the stream but no block or the on_parse_complete callback was assigned to handle them.");
}
}
}
}
static char *yajl_raise_encode_error_for_status(yajl_gen_status status, VALUE obj) {
switch (status) {
case yajl_gen_keys_must_be_strings:
rb_raise(cEncodeError, "YAJL internal error: attempted use of non-string object as key");
case yajl_max_depth_exceeded:
rb_raise(cEncodeError, "Max nesting depth of %d exceeded", YAJL_MAX_DEPTH);
case yajl_gen_in_error_state:
rb_raise(cEncodeError, "YAJL internal error: a generator function (yajl_gen_XXX) was called while in an error state");
case yajl_gen_generation_complete:
rb_raise(cEncodeError, "YAJL internal error: attempted to encode to an already-complete document");
case yajl_gen_invalid_number:
rb_raise(cEncodeError, "Invalid number: cannot encode Infinity, -Infinity, or NaN");
case yajl_gen_no_buf:
rb_raise(cEncodeError, "YAJL internal error: yajl_gen_get_buf was called, but a print callback was specified, so no internal buffer is available");
default:
return NULL;
}
}
static void yajl_set_static_value(void * ctx, VALUE val) {
yajl_parser_wrapper * wrapper;
VALUE lastEntry, hash;
long len;
GetParser((VALUE)ctx, wrapper);
len = RARRAY_LEN(wrapper->builderStack);
if (len > 0) {
lastEntry = rb_ary_entry(wrapper->builderStack, len-1);
switch (TYPE(lastEntry)) {
case T_ARRAY:
rb_ary_push(lastEntry, val);
if (TYPE(val) == T_HASH || TYPE(val) == T_ARRAY) {
rb_ary_push(wrapper->builderStack, val);
}
break;
case T_HASH:
rb_hash_aset(lastEntry, val, Qnil);
rb_ary_push(wrapper->builderStack, val);
break;
case T_STRING:
case T_SYMBOL:
hash = rb_ary_entry(wrapper->builderStack, len-2);
if (TYPE(hash) == T_HASH) {
rb_hash_aset(hash, lastEntry, val);
rb_ary_pop(wrapper->builderStack);
if (TYPE(val) == T_HASH || TYPE(val) == T_ARRAY) {
rb_ary_push(wrapper->builderStack, val);
}
}
break;
}
} else {
rb_ary_push(wrapper->builderStack, val);
}
}
static void yajl_encoder_wrapper_free(void * wrapper) {
yajl_encoder_wrapper * w = wrapper;
if (w) {
if (w->indentString) {
xfree(w->indentString);
}
yajl_gen_free(w->encoder);
xfree(w);
}
}
static void yajl_encoder_wrapper_mark(void * wrapper) {
yajl_encoder_wrapper * w = wrapper;
if (w) {
rb_gc_mark(w->on_progress_callback);
rb_gc_mark(w->terminator);
}
}
#define CHECK_STATUS(call) \
if ((status = (call)) != yajl_gen_status_ok) { break; }
void yajl_encode_part(void * wrapper, VALUE obj, VALUE io) {
VALUE str, outBuff, otherObj;
yajl_encoder_wrapper * w = wrapper;
yajl_gen_status status;
int idx = 0;
const unsigned char * buffer;
const char * cptr;
unsigned int len;
VALUE keys, entry, keyStr;
if (io != Qnil || w->on_progress_callback != Qnil) {
status = yajl_gen_get_buf(w->encoder, &buffer, &len);
if (status != yajl_gen_status_ok) {
yajl_raise_encode_error_for_status(status, obj);
}
if (len >= WRITE_BUFSIZE) {
outBuff = rb_str_new((const char *)buffer, len);
if (io != Qnil) {
rb_io_write(io, outBuff);
} else if (w->on_progress_callback != Qnil) {
rb_funcall(w->on_progress_callback, intern_call, 1, outBuff);
}
yajl_gen_clear(w->encoder);
}
}
switch (TYPE(obj)) {
case T_HASH:
CHECK_STATUS(yajl_gen_map_open(w->encoder));
/* TODO: itterate through keys in the hash */
keys = rb_funcall(obj, intern_keys, 0);
for(idx=0; idx<RARRAY_LEN(keys); idx++) {
entry = rb_ary_entry(keys, idx);
keyStr = rb_funcall(entry, intern_to_s, 0); /* key must be a string */
/* the key */
yajl_encode_part(w, keyStr, io);
/* the value */
yajl_encode_part(w, rb_hash_aref(obj, entry), io);
}
CHECK_STATUS(yajl_gen_map_close(w->encoder));
break;
case T_ARRAY:
CHECK_STATUS(yajl_gen_array_open(w->encoder));
for(idx=0; idx<RARRAY_LEN(obj); idx++) {
otherObj = rb_ary_entry(obj, idx);
yajl_encode_part(w, otherObj, io);
}
CHECK_STATUS(yajl_gen_array_close(w->encoder));
break;
case T_NIL:
CHECK_STATUS(yajl_gen_null(w->encoder));
break;
case T_TRUE:
CHECK_STATUS(yajl_gen_bool(w->encoder, 1));
break;
case T_FALSE:
CHECK_STATUS(yajl_gen_bool(w->encoder, 0));
break;
case T_FIXNUM:
case T_FLOAT:
case T_BIGNUM:
str = rb_funcall(obj, intern_to_s, 0);
cptr = RSTRING_PTR(str);
len = (unsigned int)RSTRING_LEN(str);
if (memcmp(cptr, "NaN", 3) == 0 || memcmp(cptr, "Infinity", 8) == 0 || memcmp(cptr, "-Infinity", 9) == 0) {
rb_raise(cEncodeError, "'%s' is an invalid number", cptr);
}
CHECK_STATUS(yajl_gen_number(w->encoder, cptr, len));
break;
case T_STRING:
cptr = RSTRING_PTR(obj);
len = (unsigned int)RSTRING_LEN(obj);
CHECK_STATUS(yajl_gen_string(w->encoder, (const unsigned char *)cptr, len));
break;
default:
if (rb_respond_to(obj, intern_to_json)) {
str = rb_funcall(obj, intern_to_json, 0);
Check_Type(str, T_STRING);
cptr = RSTRING_PTR(str);
len = (unsigned int)RSTRING_LEN(str);
CHECK_STATUS(yajl_gen_number(w->encoder, cptr, len));
} else {
str = rb_funcall(obj, intern_to_s, 0);
Check_Type(str, T_STRING);
cptr = RSTRING_PTR(str);
len = (unsigned int)RSTRING_LEN(str);
CHECK_STATUS(yajl_gen_string(w->encoder, (const unsigned char *)cptr, len));
}
break;
}
if (status != yajl_gen_status_ok) {
yajl_raise_encode_error_for_status(status, obj);
rb_raise(cEncodeError, "Encountered unknown YAJL status %d during JSON generation", status);
}
}
void yajl_parser_wrapper_free(void * wrapper) {
yajl_parser_wrapper * w = wrapper;
if (w) {
yajl_free(w->parser);
xfree(w);
}
}
void yajl_parser_wrapper_mark(void * wrapper) {
yajl_parser_wrapper * w = wrapper;
if (w) {
rb_gc_mark(w->builderStack);
rb_gc_mark(w->parse_complete_callback);
}
}
void yajl_parse_chunk(const unsigned char * chunk, unsigned int len, yajl_handle parser) {
yajl_status stat;
stat = yajl_parse(parser, chunk, len);
if (stat != yajl_status_ok && stat != yajl_status_insufficient_data) {
unsigned char * str = yajl_get_error(parser, 1, chunk, len);
VALUE errobj = rb_exc_new2(cParseError, (const char*) str);
yajl_free_error(parser, str);
rb_exc_raise(errobj);
}
}
/* YAJL Callbacks */
static int yajl_found_null(void * ctx) {
yajl_set_static_value(ctx, Qnil);
yajl_check_and_fire_callback(ctx);
return 1;
}
static int yajl_found_boolean(void * ctx, int boolean) {
yajl_set_static_value(ctx, boolean ? Qtrue : Qfalse);
yajl_check_and_fire_callback(ctx);
return 1;
}
static int yajl_found_number(void * ctx, const char * numberVal, unsigned int numberLen) {
char* buf = (char*)malloc(numberLen + 1);
buf[numberLen] = 0;
memcpy(buf, numberVal, numberLen);
if (memchr(buf, '.', numberLen) ||
memchr(buf, 'e', numberLen) ||
memchr(buf, 'E', numberLen)) {
yajl_set_static_value(ctx, rb_float_new(strtod(buf, NULL)));
} else {
yajl_set_static_value(ctx, rb_cstr2inum(buf, 10));
}
free(buf);
return 1;
}
static int yajl_found_string(void * ctx, const unsigned char * stringVal, unsigned int stringLen) {
VALUE str = rb_str_new((const char *)stringVal, stringLen);
#ifdef HAVE_RUBY_ENCODING_H
rb_encoding *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
yajl_set_static_value(ctx, str);
yajl_check_and_fire_callback(ctx);
return 1;
}
static int yajl_found_hash_key(void * ctx, const unsigned char * stringVal, unsigned int stringLen) {
yajl_parser_wrapper * wrapper;
VALUE keyStr;
#ifdef HAVE_RUBY_ENCODING_H
rb_encoding *default_internal_enc;
#endif
GetParser((VALUE)ctx, wrapper);
#ifdef HAVE_RUBY_ENCODING_H
default_internal_enc = rb_default_internal_encoding();
#endif
if (wrapper->symbolizeKeys) {
#ifdef HAVE_RUBY_ENCODING_H
ID id = rb_intern3((const char *)stringVal, stringLen, utf8Encoding);
keyStr = ID2SYM(id);
#else
VALUE str = rb_str_new((const char *)stringVal, stringLen);
keyStr = rb_str_intern(str);
#endif
} else {
keyStr = rb_str_new((const char *)stringVal, stringLen);
#ifdef HAVE_RUBY_ENCODING_H
rb_enc_associate(keyStr, utf8Encoding);
if (default_internal_enc) {
keyStr = rb_str_export_to_enc(keyStr, default_internal_enc);
}
#endif
}
yajl_set_static_value(ctx, keyStr);
yajl_check_and_fire_callback(ctx);
return 1;
}
static int yajl_found_start_hash(void * ctx) {
yajl_parser_wrapper * wrapper;
GetParser((VALUE)ctx, wrapper);
wrapper->nestedHashLevel++;
yajl_set_static_value(ctx, rb_hash_new());
return 1;
}
static int yajl_found_end_hash(void * ctx) {
yajl_parser_wrapper * wrapper;
GetParser((VALUE)ctx, wrapper);
wrapper->nestedHashLevel--;
if (RARRAY_LEN(wrapper->builderStack) > 1) {
rb_ary_pop(wrapper->builderStack);
}
yajl_check_and_fire_callback(ctx);
return 1;
}
static int yajl_found_start_array(void * ctx) {
yajl_parser_wrapper * wrapper;
GetParser((VALUE)ctx, wrapper);
wrapper->nestedArrayLevel++;
yajl_set_static_value(ctx, rb_ary_new());
return 1;
}
static int yajl_found_end_array(void * ctx) {
yajl_parser_wrapper * wrapper;
GetParser((VALUE)ctx, wrapper);
wrapper->nestedArrayLevel--;
if (RARRAY_LEN(wrapper->builderStack) > 1) {
rb_ary_pop(wrapper->builderStack);
}
yajl_check_and_fire_callback(ctx);
return 1;
}
/* Ruby Interface */
/*
* Document-class: Yajl::Parser
*
* This class contains methods for parsing JSON directly from an IO object.
* The only basic requirment currently is that the IO object respond to #read(len) and #eof?
* The IO is parsed until a complete JSON object has been read and a ruby object will be returned.
*/
/*
* Document-method: new
*
* call-seq: new([:symbolize_keys => true, [:allow_comments => false[, :check_utf8 => false]]])
*
* :symbolize_keys will turn hash keys into Ruby symbols, defaults to false.
*
* :allow_comments will turn on/off the check for comments inside the JSON stream, defaults to true.
*
* :check_utf8 will validate UTF8 characters found in the JSON stream, defaults to true.
*/
static VALUE rb_yajl_parser_new(int argc, VALUE * argv, VALUE klass) {
yajl_parser_wrapper * wrapper;
yajl_parser_config cfg;
VALUE opts, obj;
int allowComments = 1, checkUTF8 = 1, symbolizeKeys = 0;
/* Scan off config vars */
if (rb_scan_args(argc, argv, "01", &opts) == 1) {
Check_Type(opts, T_HASH);
if (rb_hash_aref(opts, sym_allow_comments) == Qfalse) {
allowComments = 0;
}
if (rb_hash_aref(opts, sym_check_utf8) == Qfalse) {
checkUTF8 = 0;
}
if (rb_hash_aref(opts, sym_symbolize_keys) == Qtrue || rb_hash_aref(opts, sym_symbolize_names) == Qtrue) {
symbolizeKeys = 1;
}
}
cfg = (yajl_parser_config){allowComments, checkUTF8};
obj = Data_Make_Struct(klass, yajl_parser_wrapper, yajl_parser_wrapper_mark, yajl_parser_wrapper_free, wrapper);
wrapper->parser = yajl_alloc(&callbacks, &cfg, &rb_alloc_funcs, (void *)obj);
wrapper->nestedArrayLevel = 0;
wrapper->nestedHashLevel = 0;
wrapper->objectsFound = 0;
wrapper->symbolizeKeys = symbolizeKeys;
wrapper->builderStack = rb_ary_new();
wrapper->parse_complete_callback = Qnil;
rb_obj_call_init(obj, 0, 0);
return obj;
}
/*
* Document-method: initialize
*
* call-seq: new([:symbolize_keys => true, [:allow_comments => false[, :check_utf8 => false]]])
*
* :symbolize_keys will turn hash keys into Ruby symbols, defaults to false.
*
* :allow_comments will turn on/off the check for comments inside the JSON stream, defaults to true.
*
* :check_utf8 will validate UTF8 characters found in the JSON stream, defaults to true.
*/
static VALUE rb_yajl_parser_init(int argc, VALUE * argv, VALUE self) {
return self;
}
/*
* Document-method: parse
*
* call-seq:
* parse(input, buffer_size=8092)
* parse(input, buffer_size=8092) { |obj| ... }
*
* +input+ can either be a string or an IO to parse JSON from
*
* +buffer_size+ is the size of chunk that will be parsed off the input (if it's an IO) for each loop of the parsing process.
* 8092 is a good balance between the different types of streams (off disk, off a socket, etc...), but this option
* is here so the caller can better tune their parsing depending on the type of stream being passed.
* A larger read buffer will perform better for files off disk, where as a smaller size may be more efficient for
* reading off of a socket directly.
*
* If a block was passed, it's called when an object has been parsed off the stream. This is especially
* usefull when parsing a stream of multiple JSON objects.
*
* NOTE: you can optionally assign the +on_parse_complete+ callback, and it will be called the same way the optional
* block is for this method.
*/
static VALUE rb_yajl_parser_parse(int argc, VALUE * argv, VALUE self) {
yajl_status stat;
yajl_parser_wrapper * wrapper;
VALUE rbufsize, input, blk;
unsigned int len;
const char * cptr;
GetParser(self, wrapper);
/* setup our parameters */
rb_scan_args(argc, argv, "11&", &input, &rbufsize, &blk);
if (NIL_P(rbufsize)) {
rbufsize = INT2FIX(READ_BUFSIZE);
} else {
Check_Type(rbufsize, T_FIXNUM);
}
if (!NIL_P(blk)) {
rb_yajl_parser_set_complete_cb(self, blk);
}
if (TYPE(input) == T_STRING) {
cptr = RSTRING_PTR(input);
len = (unsigned int)RSTRING_LEN(input);
yajl_parse_chunk((const unsigned char*)cptr, len, wrapper->parser);
} else if (rb_respond_to(input, intern_io_read)) {
VALUE parsed = rb_str_new(0, FIX2LONG(rbufsize));
while (rb_funcall(input, intern_io_read, 2, rbufsize, parsed) != Qnil) {
cptr = RSTRING_PTR(parsed);
len = (unsigned int)RSTRING_LEN(parsed);
yajl_parse_chunk((const unsigned char*)cptr, len, wrapper->parser);
}
} else {
rb_raise(cParseError, "input must be a string or IO");
}
/* parse any remaining buffered data */
stat = yajl_parse_complete(wrapper->parser);
if (wrapper->parse_complete_callback != Qnil) {
yajl_check_and_fire_callback((void *)self);
return Qnil;
}
return rb_ary_pop(wrapper->builderStack);
}
/*
* Document-method: parse_chunk
*
* call-seq: parse_chunk(string_chunk)
*
* +string_chunk+ can be a partial or full JSON string to push on the parser.
*
* This method will throw an exception if the +on_parse_complete+ callback hasn't been assigned yet.
* The +on_parse_complete+ callback assignment is required so the user can handle objects that have been
* parsed off the stream as they're found.
*/
static VALUE rb_yajl_parser_parse_chunk(VALUE self, VALUE chunk) {
yajl_parser_wrapper * wrapper;
unsigned int len;
GetParser(self, wrapper);
if (NIL_P(chunk)) {
rb_raise(cParseError, "Can't parse a nil string.");
}
if (wrapper->parse_complete_callback != Qnil) {
const char * cptr = RSTRING_PTR(chunk);
len = (unsigned int)RSTRING_LEN(chunk);
yajl_parse_chunk((const unsigned char*)cptr, len, wrapper->parser);
} else {
rb_raise(cParseError, "The on_parse_complete callback isn't setup, parsing useless.");
}
return Qnil;
}
/*
* Document-method: on_parse_complete=
*
* call-seq: on_parse_complete = Proc.new { |obj| ... }
*
* This callback setter allows you to pass a Proc/lambda or any other object that responds to #call.
*
* It will pass a single parameter, the ruby object built from the last parsed JSON object
*/
static VALUE rb_yajl_parser_set_complete_cb(VALUE self, VALUE callback) {
yajl_parser_wrapper * wrapper;
GetParser(self, wrapper);
wrapper->parse_complete_callback = callback;
return Qnil;
}
/*
* An event stream pulls data off the IO source into the buffer,
* then runs the lexer over that stream.
*/
struct yajl_event_stream_s {
yajl_alloc_funcs *funcs;
VALUE stream; // source
VALUE buffer;
unsigned int offset;
yajl_lexer lexer; // event source
};
typedef struct yajl_event_stream_s *yajl_event_stream_t;
struct yajl_event_s {
yajl_tok token;
const char *buf;
unsigned int len;
};
typedef struct yajl_event_s yajl_event_t;
static yajl_event_t yajl_event_stream_next(yajl_event_stream_t parser, int pop) {
assert(parser->stream);
assert(parser->buffer);
while (1) {
if (parser->offset >= RSTRING_LEN(parser->buffer)) {
//printf("reading offset %d size %ld\n", parser->offset, RSTRING_LEN(parser->buffer));
// Refill the buffer
rb_funcall(parser->stream, intern_io_read, 2, INT2FIX(RSTRING_LEN(parser->buffer)), parser->buffer);
if (RSTRING_LEN(parser->buffer) == 0) {
yajl_event_t event = {
.token = yajl_tok_eof,
};
return event;
}
parser->offset = 0;
}
// Try to pull an event off the lexer
yajl_event_t event;
yajl_tok token;
if (pop == 0) {
//printf("peeking %p %ld %d\n", RSTRING_PTR(parser->buffer), RSTRING_LEN(parser->buffer), parser->offset);
token = yajl_lex_peek(parser->lexer, (const unsigned char *)RSTRING_PTR(parser->buffer), (unsigned int)RSTRING_LEN(parser->buffer), parser->offset);
//printf("peeked event %d\n", token);
if (token == yajl_tok_eof) {
parser->offset = (unsigned int)RSTRING_LEN(parser->buffer);
continue;
}
event.token = token;
return event;
}
//printf("popping\n");
token = yajl_lex_lex(parser->lexer, (const unsigned char *)RSTRING_PTR(parser->buffer), (unsigned int)RSTRING_LEN(parser->buffer), &parser->offset, (const unsigned char **)&event.buf, &event.len);
//printf("popped event %d\n", token);
if (token == yajl_tok_eof) {
continue;
}
event.token = token;
return event;
}
return (yajl_event_t){};
}
static VALUE rb_yajl_projector_filter_array_subtree(yajl_event_stream_t parser, VALUE schema, yajl_event_t event);
static VALUE rb_yajl_projector_filter_object_subtree(yajl_event_stream_t parser, VALUE schema, yajl_event_t event);
static void rb_yajl_projector_ignore_value(yajl_event_stream_t parser);
static void rb_yajl_projector_ignore_container(yajl_event_stream_t parser);
static VALUE rb_yajl_projector_build_simple_value(yajl_event_stream_t parser, yajl_event_t event);
static VALUE rb_yajl_projector_build_string(yajl_event_stream_t parser, yajl_event_t event);
static VALUE rb_yajl_projector_filter(yajl_event_stream_t parser, VALUE schema, yajl_event_t event) {
assert(parser->stream);
switch(event.token) {
case yajl_tok_left_brace:
return rb_yajl_projector_filter_array_subtree(parser, schema, event);
break;
case yajl_tok_left_bracket:
return rb_yajl_projector_filter_object_subtree(parser, schema, event);
break;
default:
return rb_yajl_projector_build_simple_value(parser, event);
}
}
static VALUE rb_yajl_projector_filter_array_subtree(yajl_event_stream_t parser, VALUE schema, yajl_event_t event) {
assert(event.token == yajl_tok_left_brace);
VALUE ary = rb_ary_new();
while (1) {
event = yajl_event_stream_next(parser, 1);
if (event.token == yajl_tok_right_brace) {
break;
}
VALUE val = rb_yajl_projector_filter(parser, schema, event);
rb_ary_push(ary, val);
event = yajl_event_stream_next(parser, 0);
if (event.token == yajl_tok_comma) {
event = yajl_event_stream_next(parser, 1);
assert(event.token == yajl_tok_comma);
event = yajl_event_stream_next(parser, 0);
if (!(event.token == yajl_tok_string || event.token == yajl_tok_integer || event.token == yajl_tok_double || event.token == yajl_tok_null || event.token == yajl_tok_bool || event.token == yajl_tok_left_bracket || event.token == yajl_tok_left_brace)) {
rb_raise(cParseError, "read a comma, expected a value to follow, actually read %s", yajl_tok_name(event.token));
}
} else if (event.token != yajl_tok_right_brace) {
rb_raise(cParseError, "didn't read a comma, expected closing array, actually read %s", yajl_tok_name(event.token));
}
}
return ary;
}
static VALUE rb_yajl_projector_filter_object_subtree(yajl_event_stream_t parser, VALUE schema, yajl_event_t event) {
assert(event.token == yajl_tok_left_bracket);
VALUE hsh = rb_hash_new();
while (1) {
event = yajl_event_stream_next(parser, 1);
if (event.token == yajl_tok_right_bracket) {
break;
}
if (!(event.token == yajl_tok_string || event.token == yajl_tok_string_with_escapes)) {
rb_raise(cParseError, "Expected string, unexpected stream event %s", yajl_tok_name(event.token));
}
VALUE key = rb_yajl_projector_build_string(parser, event);
event = yajl_event_stream_next(parser, 1);
if (!(event.token == yajl_tok_colon)) {
rb_raise(cParseError, "Expected colon, unexpected stream event %s", yajl_tok_name(event.token));
}
// nil schema means reify the subtree from here on
// otherwise if the schema has a key for this we want it
int interesting = (schema == Qnil || rb_funcall(schema, rb_intern("key?"), 1, key) == Qtrue);
if (!interesting) {
rb_yajl_projector_ignore_value(parser);
goto peek_comma;
}
yajl_event_t value_event = yajl_event_stream_next(parser, 1);
VALUE key_schema;
if (schema == Qnil) {
key_schema = Qnil;
} else {
key_schema = rb_hash_aref(schema, key);
}
VALUE val = rb_yajl_projector_filter(parser, key_schema, value_event);
rb_str_freeze(key);
rb_hash_aset(hsh, key, val);
peek_comma:
event = yajl_event_stream_next(parser, 0);
if (event.token == yajl_tok_comma) {
event = yajl_event_stream_next(parser, 1);
assert(event.token == yajl_tok_comma);
event = yajl_event_stream_next(parser, 0);
if (!(event.token == yajl_tok_string || event.token == yajl_tok_string_with_escapes)) {
rb_raise(cParseError, "read a comma, expected a key to follow, actually read %s", yajl_tok_name(event.token));
}
} else if (event.token != yajl_tok_right_bracket) {
rb_raise(cParseError, "read a value without tailing comma, expected closing bracket, actually read %s", yajl_tok_name(event.token));
}
}
return hsh;
}
/*
# After reading a key if we know we are not interested in the next value,
# read and discard all its stream events.
#
# Values can be simple (string, numeric, boolean, null) or compound (object
# or array).
#
# Returns nothing.
*/
static void rb_yajl_projector_ignore_value(yajl_event_stream_t parser) {
yajl_event_t value_event = yajl_event_stream_next(parser, 1);
switch (value_event.token) {
case yajl_tok_null:
case yajl_tok_bool:
case yajl_tok_integer:
case yajl_tok_double:
case yajl_tok_string:
case yajl_tok_string_with_escapes:
return;
default:
break;
}
if (value_event.token == yajl_tok_left_brace || value_event.token == yajl_tok_left_bracket) {
rb_yajl_projector_ignore_container(parser);
return;
}
rb_raise(cParseError, "unknown value type to ignore %s", yajl_tok_name(value_event.token));
}
/*
# Given the start of an array or object, read until the closing event.
# Object structures can nest and this is considered.
#
# Returns nothing.
*/
static void rb_yajl_projector_ignore_container(yajl_event_stream_t parser) {
int depth = 1;
while (depth > 0) {
yajl_event_t event = yajl_event_stream_next(parser, 1);
if (event.token == yajl_tok_eof) {
return;
}
if (event.token == yajl_tok_left_bracket || event.token == yajl_tok_left_brace) {
depth += 1;
} else if (event.token == yajl_tok_right_bracket || event.token == yajl_tok_right_brace) {
depth -= 1;
}
}
}
static VALUE rb_yajl_projector_build_simple_value(yajl_event_stream_t parser, yajl_event_t event) {
assert(parser->stream);
switch (event.token) {
case yajl_tok_null:;
return Qnil;
case yajl_tok_bool:;
if (memcmp(event.buf, "true", 4) == 0) {
return Qtrue;
} else if (memcmp(event.buf, "false", 4) == 0) {
return Qfalse;
} else {
rb_raise(cStandardError, "unknown boolean token %s", event.buf);
}
case yajl_tok_integer:;
case yajl_tok_double:;
char *buf = (char *)malloc(event.len + 1);
buf[event.len] = 0;
memcpy(buf, event.buf, event.len);
VALUE val;
if (memchr(buf, '.', event.len) ||
memchr(buf, 'e', event.len) ||
memchr(buf, 'E', event.len)) {
val = rb_float_new(strtod(buf, NULL));
} else {
val = rb_cstr2inum(buf, 10);
}
free(buf);
return val;
case yajl_tok_string:;
case yajl_tok_string_with_escapes:;
return rb_yajl_projector_build_string(parser, event);
case yajl_tok_eof:;
rb_raise(cParseError, "unexpected eof while constructing value");
case yajl_tok_comma:
rb_raise(cParseError, "unexpected comma while constructing value");
case yajl_tok_colon:
rb_raise(cParseError, "unexpected colon while constructing value");
default:;
assert(0);
}
}
static VALUE rb_yajl_projector_build_string(yajl_event_stream_t parser, yajl_event_t event) {
switch (event.token) {
case yajl_tok_string:; {
VALUE str = rb_str_new(event.buf, event.len);
rb_enc_associate(str, utf8Encoding);
rb_encoding *default_internal_enc = rb_default_internal_encoding();
if (default_internal_enc) {
str = rb_str_export_to_enc(str, default_internal_enc);
}
return str;
}
case yajl_tok_string_with_escapes:; {
//printf("decoding string with escapes\n");
yajl_buf strBuf = yajl_buf_alloc(parser->funcs);
yajl_string_decode(strBuf, (const unsigned char *)event.buf, event.len);
VALUE str = rb_str_new((const char *)yajl_buf_data(strBuf), yajl_buf_len(strBuf));
rb_enc_associate(str, utf8Encoding);
yajl_buf_free(strBuf);
rb_encoding *default_internal_enc = rb_default_internal_encoding();
if (default_internal_enc) {
str = rb_str_export_to_enc(str, default_internal_enc);
}
return str;
}
default:; {
assert(0);
}
}
}
static VALUE rb_protected_yajl_projector_filter(VALUE pointer) {
VALUE *args = (VALUE *)pointer;
return rb_yajl_projector_filter((struct yajl_event_stream_s *)args[0],
args[1],
*(yajl_event_t *)args[2]);
}
/*
* Document-method: project
*/
static VALUE rb_yajl_projector_project(VALUE self, VALUE schema) {
VALUE stream = rb_iv_get(self, "@stream");
long buffer_size = FIX2LONG(rb_iv_get(self, "@buffer_size"));
VALUE buffer = rb_str_new(0, buffer_size);
struct yajl_event_stream_s parser = {
.funcs = &rb_alloc_funcs,
.stream = stream,
.buffer = buffer,
.offset = (unsigned int)buffer_size,
.lexer = yajl_lex_alloc(&rb_alloc_funcs, 0, 1),
};
yajl_event_t event = yajl_event_stream_next(&parser, 1);
RB_GC_GUARD(stream);
RB_GC_GUARD(buffer);
VALUE result;
int state = 0;
if (event.token == yajl_tok_left_brace || event.token == yajl_tok_left_bracket) {
VALUE args[3];
args[0] = (VALUE)&parser;
args[1] = schema;
args[2] = (VALUE)&event;
result = rb_protect(rb_protected_yajl_projector_filter,
(VALUE)args,
&state);
} else {
yajl_lex_free(parser.lexer);
rb_raise(cParseError, "expected left bracket or brace, actually read %s", yajl_tok_name(event.token));
}
yajl_lex_free(parser.lexer);
if (state) rb_jump_tag(state);
return result;
}
/*
* Document-class: Yajl::Encoder
*
* This class contains methods for encoding a Ruby object into JSON, streaming it's output into an IO object.
* The IO object need only respond to #write(str)
* The JSON stream created is written to the IO in chunks, as it's being created.
*/
static unsigned char * defaultIndentString = (unsigned char *)" ";
/*
* Document-method: new
*
* call-seq: initialize([:pretty => false[, :indent => ' '][, :terminator => "\n"]])
*
* :pretty will enable/disable beautifying or "pretty priting" the output string.
*
* :indent is the character(s) used to indent the output string.