Annotation of parser3/src/classes/json.C, revision 1.24
1.1 misha 1: /** @file
2: Parser: @b json parser class.
3:
1.17 moko 4: Copyright (c) 2000-2012 Art. Lebedev Studio (http://www.artlebedev.com)
1.1 misha 5: */
6:
7: #include "classes.h"
8: #include "pa_vmethod_frame.h"
9:
10: #include "pa_request.h"
11: #include "pa_vbool.h"
12:
13: #include "pa_charset.h"
14: #include "pa_charsets.h"
15: #include "JSON_parser.h"
16:
1.14 misha 17: #ifdef XML
18: #include "pa_vxdoc.h"
19: #endif
20:
1.24 ! moko 21: volatile const char * IDENT_JSON_C="$Id: json.C,v 1.23 2012-06-04 13:46:18 moko Exp $";
1.17 moko 22:
1.1 misha 23: // class
24:
25: class MJson: public Methoded {
26: public:
27: MJson();
28: };
29:
30: // global variable
31:
32: DECLARE_CLASS_VAR(json, new MJson, 0);
33:
34: // methods
35: struct Json {
1.4 moko 36: Stack<VHash*> stack;
1.3 moko 37: Stack<String*> key_stack;
1.1 misha 38:
1.3 moko 39: String* key;
1.1 misha 40: Value* result;
41:
1.16 misha 42: Junction* hook_object;
43: Junction* hook_array;
1.3 moko 44: Request* request;
45:
1.1 misha 46: Charset *charset;
1.23 moko 47: String::Language taint;
48:
1.1 misha 49: bool handle_double;
1.4 moko 50: enum Distinct { D_EXCEPTION, D_FIRST, D_LAST, D_ALL } distinct;
1.3 moko 51:
1.23 moko 52: Json(Charset* acharset): stack(), key_stack(), key(NULL), result(NULL), hook_object(NULL), hook_array(NULL),
53: request(NULL), charset(acharset), taint(String::L_TAINTED), handle_double(true), distinct(D_EXCEPTION){}
1.4 moko 54:
55: bool set_distinct(const String &value){
56: if (value == "first") distinct = D_FIRST;
57: else if (value == "last") distinct = D_LAST;
58: else if (value == "all") distinct = D_ALL;
59: else return false;
60: return true;
61: }
1.1 misha 62: };
63:
64: static void set_json_value(Json *json, Value *value){
1.4 moko 65: VHash *top = json->stack.top_value();
1.3 moko 66: if(json->key == NULL){
1.4 moko 67: top->hash().put(String(format(top->get_hash()->count(), 0)), value);
1.1 misha 68: } else {
1.4 moko 69: switch (json->distinct){
70: case Json::D_EXCEPTION:
71: if (top->hash().put_dont_replace(*json->key, value))
72: throw Exception(PARSER_RUNTIME, json->key, "duplicate key");
73: break;
74: case Json::D_FIRST:
75: top->hash().put_dont_replace(*json->key, value);
76: break;
77: case Json::D_LAST:
78: top->hash().put(*json->key, value);
79: break;
80: case Json::D_ALL:
81: if (top->hash().put_dont_replace(*json->key, value)){
82: for(int i=2;;i++){
83: String key;
84: key << *json->key << "_" << format(i, 0);
85: if (!top->hash().put_dont_replace(key, value)) break;
86: }
87: }
88: break;
89: }
1.3 moko 90: json->key=NULL;
1.1 misha 91: }
92: }
93:
1.3 moko 94: String* json_string(Json *json, const JSON_value* value){
95: String::C result = json->charset !=NULL ?
1.23 moko 96: Charset::transcode(String::C(value->vu.str.value, value->vu.str.length), UTF8_charset, *json->charset) :
97: String::C(pa_strdup(value->vu.str.value, value->vu.str.length), value->vu.str.length);
98: return new String(result.str, json->taint, result.length);
1.1 misha 99: }
100:
1.3 moko 101: static Value *json_hook(Request &r, Junction *hook, String* key, Value* value){
102: VMethodFrame frame(*hook->method, r.method_frame, hook->self);
1.10 moko 103: Value *params[]={new VString(key ? *key : String::Empty), value};
1.3 moko 104:
105: frame.store_params(params, 2);
106: r.execute_method(frame);
107:
108: return &frame.result().as_value();
1.1 misha 109: }
110:
111: static int json_callback(Json *json, int type, const JSON_value* value)
112: {
113: switch(type) {
114: case JSON_T_OBJECT_BEGIN:{
1.4 moko 115: VHash *v = new VHash();
1.16 misha 116: if (json->hook_object){
1.1 misha 117: json->key_stack.push(json->key);
1.16 misha 118: json->key=NULL;
1.1 misha 119: } else {
120: if (json->stack.count()) set_json_value(json, v);
121: }
122: json->stack.push(v);
123: break;
124: }
125: case JSON_T_OBJECT_END:{
1.16 misha 126: if (json->hook_object){
1.3 moko 127: String* key = json->key_stack.pop();
1.16 misha 128: json->result = json_hook(*json->request, json->hook_object, key, json->stack.pop());
1.1 misha 129:
130: if (json->stack.count()){
131: json->key = key;
132: set_json_value(json, json->result);
133: }
134: } else {
135: json->result = json->stack.pop();
136: }
137: break;
138: }
139: case JSON_T_ARRAY_BEGIN:{
1.4 moko 140: VHash *v = new VHash();
1.16 misha 141: if (json->hook_array){
142: json->key_stack.push(json->key);
143: json->key=NULL;
144: } else {
145: if (json->stack.count()) set_json_value(json, v);
146: }
1.1 misha 147: json->stack.push(v);
148: break;
149: }
150: case JSON_T_ARRAY_END:
1.12 moko 151: // libjson supports array at top level, we too
1.16 misha 152: if (json->hook_array){
153: String* key = json->key_stack.pop();
154: json->result = json_hook(*json->request, json->hook_array, key, json->stack.pop());
155:
156: if (json->stack.count()){
157: json->key = key;
158: set_json_value(json, json->result);
159: }
160: } else {
161: json->result = json->stack.pop();
162: }
1.1 misha 163: break;
164: case JSON_T_KEY:
165: json->key = json_string(json, value);
1.16 misha 166: break;
1.1 misha 167: case JSON_T_INTEGER:
1.20 moko 168: set_json_value(json, new VDouble((double)value->vu.integer_value));
1.1 misha 169: break;
170: case JSON_T_FLOAT:
171: if (json->handle_double){
1.3 moko 172: set_json_value(json, new VDouble( json_string(json, value)->as_double() ));
1.1 misha 173: break;
174: } // else is JSON_T_STRING
175: case JSON_T_STRING:
1.3 moko 176: set_json_value(json, new VString(*json_string(json, value)));
1.1 misha 177: break;
178: case JSON_T_NULL:
1.18 moko 179: set_json_value(json, VVoid::get());
1.1 misha 180: break;
181: case JSON_T_TRUE:
182: set_json_value(json, &VBool::get(true));
183: break;
184: case JSON_T_FALSE:
185: set_json_value(json, &VBool::get(false));
186: break;
187: }
188: return 1;
189: }
190:
1.5 moko 191: static const char* json_error_message(int error_code){
192: static const char* error_messages[] = {
1.1 misha 193: NULL,
194: "invalid char",
195: "invalid keyword",
196: "invalid escape sequence",
197: "invalid unicode sequence",
198: "invalid number",
199: "nesting depth reached",
200: "unbalanced collection",
201: "expected key",
202: "expected colon",
203: "out of memory"
204: };
205: return error_messages[error_code];
206: }
207:
1.23 moko 208: extern String::Language get_untaint_lang(const String& lang_name);
209:
1.1 misha 210: static void _parse(Request& r, MethodParams& params) {
1.3 moko 211: const String& json_string=params.as_string(0, "json must be string");
212:
213: Json json(r.charsets.source().isUTF8() ? NULL : &(r.charsets.source()));
1.1 misha 214:
215: JSON_config config;
216: init_JSON_config(&config);
217:
218: config.depth = 19;
219: config.callback = (JSON_parser_callback)&json_callback;
220: config.allow_comments = 1;
221: config.handle_floats_manually = 1;
222: config.callback_ctx = &json;
223:
224: if(params.count() == 2)
225: if(HashStringValue* options=params.as_hash(1)) {
226: int valid_options=0;
227: if(Value* value=options->get("depth")) {
1.4 moko 228: config.depth=r.process_to_value(*value).as_int();
1.1 misha 229: valid_options++;
230: }
231: if(Value* value=options->get("double")) {
1.4 moko 232: json.handle_double=r.process_to_value(*value).as_bool();
233: valid_options++;
234: }
235: if(Value* value=options->get("distinct")) {
236: const String& sdistinct=value->as_string();
237: if (!json.set_distinct(sdistinct))
238: throw Exception(PARSER_RUNTIME, &sdistinct, "must be 'first', 'last' or 'all'");
1.1 misha 239: valid_options++;
240: }
1.23 moko 241: if(Value* value=options->get("taint")) {
242: json.taint=get_untaint_lang(value->as_string());
243: valid_options++;
244: }
1.1 misha 245: if(Value* value=options->get("object")) {
1.16 misha 246: json.hook_object=value->get_junction();
1.3 moko 247: json.request=&r;
1.16 misha 248: if (!json.hook_object || !json.hook_object->method || !json.hook_object->method->params_names || !(json.hook_object->method->params_names->count() == 2))
1.1 misha 249: throw Exception(PARSER_RUNTIME, 0, "$.object must be parser method with 2 parameters");
250: valid_options++;
251: }
1.16 misha 252: if(Value* value=options->get("array")) {
253: json.hook_array=value->get_junction();
254: json.request=&r;
255: if (!json.hook_array || !json.hook_array->method || !json.hook_array->method->params_names || !(json.hook_array->method->params_names->count() == 2))
256: throw Exception(PARSER_RUNTIME, 0, "$.array must be parser method with 2 parameters");
257: valid_options++;
258: }
1.1 misha 259: if(valid_options!=options->count())
260: throw Exception(PARSER_RUNTIME, 0, CALLED_WITH_INVALID_OPTION);
261: }
262:
1.2 misha 263: const String::Body json_body = json_string.cstr_to_string_body_untaint(String::L_JSON, 0, &(r.charsets));
1.1 misha 264: const char *json_cstr = json.charset != NULL ? Charset::transcode(json_body, *json.charset, UTF8_charset).cstr() : json_body.cstr();
265:
1.3 moko 266: struct JSON_parser_struct* jc = new_JSON_parser(&config);
267:
1.1 misha 268: for (const char *c=json_cstr; *c; c++){
269: if (!JSON_parser_char(jc, *((const unsigned char *)c))) {
270: throw Exception("json.parse", 0, "%s at byte %d", json_error_message(JSON_parser_get_last_error(jc)), c-json_cstr);
271: }
272: }
273:
274: if (!JSON_parser_done(jc)) {
275: throw Exception("json.parse", 0, "%s at the end", json_error_message(JSON_parser_get_last_error(jc)));
276: }
277:
278: delete_JSON_parser(jc);
279:
280: if (json.result) r.write_no_lang(*json.result);
281: }
282:
1.8 moko 283: char *get_indent(uint level){
284: static char* cache[ANTI_ENDLESS_JSON_STRING_RECOURSION]={};
285: if (!cache[level]){
286: char *result = static_cast<char*>(pa_gc_malloc_atomic(level+1));
287: memset(result, '\t', level);
1.9 moko 288: result[level]='\0';
1.8 moko 289: return cache[level]=result;
290: }
291: return cache[level];
292: }
293:
1.21 moko 294: const String& value_json_string(String::Body key, Value& v, Json_options& options);
1.6 misha 295:
1.21 moko 296: const String* Json_options::hash_json_string(HashStringValue &hash) {
1.6 misha 297: if(!hash.count())
1.21 moko 298: return new String("{}", String::L_AS_IS);
1.8 moko 299:
1.21 moko 300: uint level = r->json_string_recoursion_go_down();
1.8 moko 301:
302: String& result = *new String("{\n", String::L_AS_IS);
303:
1.21 moko 304: if (indent){
1.8 moko 305:
306: String *delim=NULL;
1.21 moko 307: indent=get_indent(level);
1.8 moko 308: for(HashStringValue::Iterator i(hash); i; i.next() ){
309: if (delim){
310: result << *delim;
311: } else {
1.21 moko 312: result << indent << "\"";
313: delim = new String(",\n", String::L_AS_IS); *delim << indent << "\"";
1.8 moko 314: }
1.21 moko 315: result << String(i.key(), String::L_JSON) << "\":" << value_json_string(i.key(), *i.value(), *this);
1.8 moko 316: }
1.21 moko 317: result << "\n" << (indent=get_indent(level-1)) << "}";
1.6 misha 318:
1.8 moko 319: } else {
320:
321: bool need_delim=false;
322: for(HashStringValue::Iterator i(hash); i; i.next() ){
323: result << (need_delim ? ",\n\"" : "\"");
1.21 moko 324: result << String(i.key(), String::L_JSON) << "\":" << value_json_string(i.key(), *i.value(), *this);
1.8 moko 325: need_delim=true;
326: }
327: result << "\n}";
1.6 misha 328:
329: }
330:
1.21 moko 331: r->json_string_recoursion_go_up();
332: return &result;
1.6 misha 333: }
334:
1.21 moko 335: static bool based_on(HashStringValue::key_type key, HashStringValue::value_type /*value*/, Value* v) {
1.15 misha 336: return v->is(key.cstr());
337: }
338:
1.21 moko 339: const String& value_json_string(String::Body key, Value& v, Json_options& options) {
340: if(options.methods) {
341: Value* method=options.methods->get(v.type());
342: if(!method){
343: method=options.methods->first_that<Value*>(based_on, &v);
344: options.methods->put(key, method ? method : VVoid::get());
345: }
346: if(method && !method->is_void()) {
1.6 misha 347: Junction* junction=method->get_junction();
1.21 moko 348: VMethodFrame frame(*junction->method, options.r->method_frame, junction->self);
1.6 misha 349:
1.21 moko 350: Value *params[]={new VString(*new String(key, String::L_JSON)), &v, options.params ? options.params : VVoid::get()};
1.13 moko 351: frame.store_params(params, 3);
1.6 misha 352:
1.21 moko 353: options.r->execute_method(frame);
1.6 misha 354:
355: return frame.result().as_string();
356: }
1.15 misha 357: }
1.6 misha 358:
1.21 moko 359: options.key=key;
1.6 misha 360: return *v.get_json_string(options);
361: }
362:
363: static void _string(Request& r, MethodParams& params) {
364: Json_options json(&r);
365:
366: if(params.count() == 2)
367: if(HashStringValue* options=params.as_hash(1)) {
368: json.params=params.get(1);
369: HashStringValue* methods=new HashStringValue();
370: int valid_options=0;
1.14 misha 371: HashStringValue* vvalue;
1.6 misha 372: for(HashStringValue::Iterator i(*options); i; i.next() ){
373: String::Body key=i.key();
374: Value* value=i.value();
375: if(key == "skip-unknown"){
376: json.skip_unknown=r.process_to_value(*value).as_bool();
377: valid_options++;
378: } else if(key == "date" && value->is_string()){
379: const String& svalue=value->as_string();
380: if(!json.set_date_format(svalue))
381: throw Exception(PARSER_RUNTIME, &svalue, "must be 'sql-string', 'gmt-string' or 'unix-timestamp'");
382: valid_options++;
1.8 moko 383: } else if(key == "indent"){
384: json.indent=r.process_to_value(*value).as_bool() ? "":NULL;
385: valid_options++;
1.6 misha 386: } else if(key == "table" && value->is_string()){
387: const String& svalue=value->as_string();
388: if(!json.set_table_format(svalue))
1.13 moko 389: throw Exception(PARSER_RUNTIME, &svalue, "must be 'array', 'object' or 'compact'");
1.6 misha 390: valid_options++;
391: } else if(key == "file" && value->is_string()){
392: const String& svalue=value->as_string();
393: if(!json.set_file_format(svalue))
1.19 misha 394: throw Exception(PARSER_RUNTIME, &svalue, "must be 'base64', 'text' or 'stat'");
1.6 misha 395: valid_options++;
1.14 misha 396: #ifdef XML
397: } else if(key == "xdoc" && (vvalue = value->get_hash())){
1.24 ! moko 398: json.xdoc_options=new XDocOutputOptions();
! 399: json.xdoc_options->append(r, vvalue);
1.14 misha 400: valid_options++;
401: #endif
1.6 misha 402: } else if(Junction* junction=value->get_junction()){
1.13 moko 403: if(!junction->method || !junction->method->params_names || junction->method->params_names->count() != 3)
404: throw Exception(PARSER_RUNTIME, 0, "$.%s must be parser method with 3 parameters", key.cstr());
1.6 misha 405: methods->put(key, value);
406: valid_options++;
407: }
408: }
1.22 moko 409:
1.6 misha 410: if(valid_options!=options->count())
411: throw Exception(PARSER_RUNTIME, 0, CALLED_WITH_INVALID_OPTION);
1.22 moko 412:
413: // special handling for $._default
414: if(VHash* vhash=static_cast<VHash*>(params[1].as(VHASH_TYPE)))
415: if(Value* value=vhash->get_default()) {
416: Junction* junction=value->get_junction();
417: if(!junction || !junction->method || !junction->method->params_names || junction->method->params_names->count() != 3)
418: throw Exception(PARSER_RUNTIME, 0, "$.%s must be parser method with 3 parameters", HASH_DEFAULT_ELEMENT_NAME);
419: json.default_method=value;
420: }
421:
1.6 misha 422: if(methods->count())
423: json.methods=methods;
424: }
1.14 misha 425:
1.21 moko 426: const String& result_string=value_json_string(String::Body(), params[0], json);
1.13 moko 427: String::Body result_body=result_string.cstr_to_string_body_untaint(String::L_JSON, 0, &r.charsets);
428: r.write_pass_lang(*new String(result_body, String::L_AS_IS));
1.6 misha 429: }
430:
1.1 misha 431: // constructor
432:
433: MJson::MJson(): Methoded("json") {
434: add_native_method("parse", Method::CT_STATIC, _parse, 1, 2);
1.6 misha 435:
436: add_native_method("string", Method::CT_ANY, _string, 1, 2);
1.1 misha 437: }
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