Annotation of parser3/src/classes/json.C, revision 1.22
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:
1.22 ! moko 21: volatile const char * IDENT_JSON_C="$Id: json.C,v 1.21 2012-05-28 19:47:52 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;
47: bool handle_double;
1.4 moko 48: enum Distinct { D_EXCEPTION, D_FIRST, D_LAST, D_ALL } distinct;
1.3 moko 49:
1.16 misha 50: Json(Charset* acharset): stack(), key_stack(), key(NULL), result(NULL), hook_object(NULL), hook_array(NULL), request(NULL), charset(acharset), handle_double(true), distinct(D_EXCEPTION){}
1.4 moko 51:
52: bool set_distinct(const String &value){
53: if (value == "first") distinct = D_FIRST;
54: else if (value == "last") distinct = D_LAST;
55: else if (value == "all") distinct = D_ALL;
56: else return false;
57: return true;
58: }
1.1 misha 59: };
60:
61: static void set_json_value(Json *json, Value *value){
1.4 moko 62: VHash *top = json->stack.top_value();
1.3 moko 63: if(json->key == NULL){
1.4 moko 64: top->hash().put(String(format(top->get_hash()->count(), 0)), value);
1.1 misha 65: } else {
1.4 moko 66: switch (json->distinct){
67: case Json::D_EXCEPTION:
68: if (top->hash().put_dont_replace(*json->key, value))
69: throw Exception(PARSER_RUNTIME, json->key, "duplicate key");
70: break;
71: case Json::D_FIRST:
72: top->hash().put_dont_replace(*json->key, value);
73: break;
74: case Json::D_LAST:
75: top->hash().put(*json->key, value);
76: break;
77: case Json::D_ALL:
78: if (top->hash().put_dont_replace(*json->key, value)){
79: for(int i=2;;i++){
80: String key;
81: key << *json->key << "_" << format(i, 0);
82: if (!top->hash().put_dont_replace(key, value)) break;
83: }
84: }
85: break;
86: }
1.3 moko 87: json->key=NULL;
1.1 misha 88: }
89: }
90:
1.3 moko 91: String* json_string(Json *json, const JSON_value* value){
92: String::C result = json->charset !=NULL ?
93: Charset::transcode(String::C(value->vu.str.value, value->vu.str.length), UTF8_charset, *json->charset) :
94: String::C(pa_strdup(value->vu.str.value, value->vu.str.length), value->vu.str.length);
95: return new String(result.str, String::L_TAINTED, result.length);
1.1 misha 96: }
97:
1.3 moko 98: static Value *json_hook(Request &r, Junction *hook, String* key, Value* value){
99: VMethodFrame frame(*hook->method, r.method_frame, hook->self);
1.10 moko 100: Value *params[]={new VString(key ? *key : String::Empty), value};
1.3 moko 101:
102: frame.store_params(params, 2);
103: r.execute_method(frame);
104:
105: return &frame.result().as_value();
1.1 misha 106: }
107:
108: static int json_callback(Json *json, int type, const JSON_value* value)
109: {
110: switch(type) {
111: case JSON_T_OBJECT_BEGIN:{
1.4 moko 112: VHash *v = new VHash();
1.16 misha 113: if (json->hook_object){
1.1 misha 114: json->key_stack.push(json->key);
1.16 misha 115: json->key=NULL;
1.1 misha 116: } else {
117: if (json->stack.count()) set_json_value(json, v);
118: }
119: json->stack.push(v);
120: break;
121: }
122: case JSON_T_OBJECT_END:{
1.16 misha 123: if (json->hook_object){
1.3 moko 124: String* key = json->key_stack.pop();
1.16 misha 125: json->result = json_hook(*json->request, json->hook_object, key, json->stack.pop());
1.1 misha 126:
127: if (json->stack.count()){
128: json->key = key;
129: set_json_value(json, json->result);
130: }
131: } else {
132: json->result = json->stack.pop();
133: }
134: break;
135: }
136: case JSON_T_ARRAY_BEGIN:{
1.4 moko 137: VHash *v = new VHash();
1.16 misha 138: if (json->hook_array){
139: json->key_stack.push(json->key);
140: json->key=NULL;
141: } else {
142: if (json->stack.count()) set_json_value(json, v);
143: }
1.1 misha 144: json->stack.push(v);
145: break;
146: }
147: case JSON_T_ARRAY_END:
1.12 moko 148: // libjson supports array at top level, we too
1.16 misha 149: if (json->hook_array){
150: String* key = json->key_stack.pop();
151: json->result = json_hook(*json->request, json->hook_array, key, json->stack.pop());
152:
153: if (json->stack.count()){
154: json->key = key;
155: set_json_value(json, json->result);
156: }
157: } else {
158: json->result = json->stack.pop();
159: }
1.1 misha 160: break;
161: case JSON_T_KEY:
162: json->key = json_string(json, value);
1.16 misha 163: break;
1.1 misha 164: case JSON_T_INTEGER:
1.20 moko 165: set_json_value(json, new VDouble((double)value->vu.integer_value));
1.1 misha 166: break;
167: case JSON_T_FLOAT:
168: if (json->handle_double){
1.3 moko 169: set_json_value(json, new VDouble( json_string(json, value)->as_double() ));
1.1 misha 170: break;
171: } // else is JSON_T_STRING
172: case JSON_T_STRING:
1.3 moko 173: set_json_value(json, new VString(*json_string(json, value)));
1.1 misha 174: break;
175: case JSON_T_NULL:
1.18 moko 176: set_json_value(json, VVoid::get());
1.1 misha 177: break;
178: case JSON_T_TRUE:
179: set_json_value(json, &VBool::get(true));
180: break;
181: case JSON_T_FALSE:
182: set_json_value(json, &VBool::get(false));
183: break;
184: }
185: return 1;
186: }
187:
1.5 moko 188: static const char* json_error_message(int error_code){
189: static const char* error_messages[] = {
1.1 misha 190: NULL,
191: "invalid char",
192: "invalid keyword",
193: "invalid escape sequence",
194: "invalid unicode sequence",
195: "invalid number",
196: "nesting depth reached",
197: "unbalanced collection",
198: "expected key",
199: "expected colon",
200: "out of memory"
201: };
202: return error_messages[error_code];
203: }
204:
205: static void _parse(Request& r, MethodParams& params) {
1.3 moko 206: const String& json_string=params.as_string(0, "json must be string");
207:
208: Json json(r.charsets.source().isUTF8() ? NULL : &(r.charsets.source()));
1.1 misha 209:
210: JSON_config config;
211: init_JSON_config(&config);
212:
213: config.depth = 19;
214: config.callback = (JSON_parser_callback)&json_callback;
215: config.allow_comments = 1;
216: config.handle_floats_manually = 1;
217: config.callback_ctx = &json;
218:
219: if(params.count() == 2)
220: if(HashStringValue* options=params.as_hash(1)) {
221: int valid_options=0;
222: if(Value* value=options->get("depth")) {
1.4 moko 223: config.depth=r.process_to_value(*value).as_int();
1.1 misha 224: valid_options++;
225: }
226: if(Value* value=options->get("double")) {
1.4 moko 227: json.handle_double=r.process_to_value(*value).as_bool();
228: valid_options++;
229: }
230: if(Value* value=options->get("distinct")) {
231: const String& sdistinct=value->as_string();
232: if (!json.set_distinct(sdistinct))
233: throw Exception(PARSER_RUNTIME, &sdistinct, "must be 'first', 'last' or 'all'");
1.1 misha 234: valid_options++;
235: }
236: if(Value* value=options->get("object")) {
1.16 misha 237: json.hook_object=value->get_junction();
1.3 moko 238: json.request=&r;
1.16 misha 239: 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 240: throw Exception(PARSER_RUNTIME, 0, "$.object must be parser method with 2 parameters");
241: valid_options++;
242: }
1.16 misha 243: if(Value* value=options->get("array")) {
244: json.hook_array=value->get_junction();
245: json.request=&r;
246: if (!json.hook_array || !json.hook_array->method || !json.hook_array->method->params_names || !(json.hook_array->method->params_names->count() == 2))
247: throw Exception(PARSER_RUNTIME, 0, "$.array must be parser method with 2 parameters");
248: valid_options++;
249: }
1.1 misha 250: if(valid_options!=options->count())
251: throw Exception(PARSER_RUNTIME, 0, CALLED_WITH_INVALID_OPTION);
252: }
253:
1.2 misha 254: const String::Body json_body = json_string.cstr_to_string_body_untaint(String::L_JSON, 0, &(r.charsets));
1.1 misha 255: const char *json_cstr = json.charset != NULL ? Charset::transcode(json_body, *json.charset, UTF8_charset).cstr() : json_body.cstr();
256:
1.3 moko 257: struct JSON_parser_struct* jc = new_JSON_parser(&config);
258:
1.1 misha 259: for (const char *c=json_cstr; *c; c++){
260: if (!JSON_parser_char(jc, *((const unsigned char *)c))) {
261: throw Exception("json.parse", 0, "%s at byte %d", json_error_message(JSON_parser_get_last_error(jc)), c-json_cstr);
262: }
263: }
264:
265: if (!JSON_parser_done(jc)) {
266: throw Exception("json.parse", 0, "%s at the end", json_error_message(JSON_parser_get_last_error(jc)));
267: }
268:
269: delete_JSON_parser(jc);
270:
271: if (json.result) r.write_no_lang(*json.result);
272: }
273:
1.8 moko 274: char *get_indent(uint level){
275: static char* cache[ANTI_ENDLESS_JSON_STRING_RECOURSION]={};
276: if (!cache[level]){
277: char *result = static_cast<char*>(pa_gc_malloc_atomic(level+1));
278: memset(result, '\t', level);
1.9 moko 279: result[level]='\0';
1.8 moko 280: return cache[level]=result;
281: }
282: return cache[level];
283: }
284:
1.21 moko 285: const String& value_json_string(String::Body key, Value& v, Json_options& options);
1.6 misha 286:
1.21 moko 287: const String* Json_options::hash_json_string(HashStringValue &hash) {
1.6 misha 288: if(!hash.count())
1.21 moko 289: return new String("{}", String::L_AS_IS);
1.8 moko 290:
1.21 moko 291: uint level = r->json_string_recoursion_go_down();
1.8 moko 292:
293: String& result = *new String("{\n", String::L_AS_IS);
294:
1.21 moko 295: if (indent){
1.8 moko 296:
297: String *delim=NULL;
1.21 moko 298: indent=get_indent(level);
1.8 moko 299: for(HashStringValue::Iterator i(hash); i; i.next() ){
300: if (delim){
301: result << *delim;
302: } else {
1.21 moko 303: result << indent << "\"";
304: delim = new String(",\n", String::L_AS_IS); *delim << indent << "\"";
1.8 moko 305: }
1.21 moko 306: result << String(i.key(), String::L_JSON) << "\":" << value_json_string(i.key(), *i.value(), *this);
1.8 moko 307: }
1.21 moko 308: result << "\n" << (indent=get_indent(level-1)) << "}";
1.6 misha 309:
1.8 moko 310: } else {
311:
312: bool need_delim=false;
313: for(HashStringValue::Iterator i(hash); i; i.next() ){
314: result << (need_delim ? ",\n\"" : "\"");
1.21 moko 315: result << String(i.key(), String::L_JSON) << "\":" << value_json_string(i.key(), *i.value(), *this);
1.8 moko 316: need_delim=true;
317: }
318: result << "\n}";
1.6 misha 319:
320: }
321:
1.21 moko 322: r->json_string_recoursion_go_up();
323: return &result;
1.6 misha 324: }
325:
1.21 moko 326: static bool based_on(HashStringValue::key_type key, HashStringValue::value_type /*value*/, Value* v) {
1.15 misha 327: return v->is(key.cstr());
328: }
329:
1.21 moko 330: const String& value_json_string(String::Body key, Value& v, Json_options& options) {
331: if(options.methods) {
332: Value* method=options.methods->get(v.type());
333: if(!method){
334: method=options.methods->first_that<Value*>(based_on, &v);
335: options.methods->put(key, method ? method : VVoid::get());
336: }
337: if(method && !method->is_void()) {
1.6 misha 338: Junction* junction=method->get_junction();
1.21 moko 339: VMethodFrame frame(*junction->method, options.r->method_frame, junction->self);
1.6 misha 340:
1.21 moko 341: Value *params[]={new VString(*new String(key, String::L_JSON)), &v, options.params ? options.params : VVoid::get()};
1.13 moko 342: frame.store_params(params, 3);
1.6 misha 343:
1.21 moko 344: options.r->execute_method(frame);
1.6 misha 345:
346: return frame.result().as_string();
347: }
1.15 misha 348: }
1.6 misha 349:
1.21 moko 350: options.key=key;
1.6 misha 351: return *v.get_json_string(options);
352: }
353:
354: static void _string(Request& r, MethodParams& params) {
355: Json_options json(&r);
356:
357: if(params.count() == 2)
358: if(HashStringValue* options=params.as_hash(1)) {
359: json.params=params.get(1);
360: HashStringValue* methods=new HashStringValue();
361: int valid_options=0;
1.14 misha 362: HashStringValue* vvalue;
1.6 misha 363: for(HashStringValue::Iterator i(*options); i; i.next() ){
364: String::Body key=i.key();
365: Value* value=i.value();
366: if(key == "skip-unknown"){
367: json.skip_unknown=r.process_to_value(*value).as_bool();
368: valid_options++;
369: } else if(key == "date" && value->is_string()){
370: const String& svalue=value->as_string();
371: if(!json.set_date_format(svalue))
372: throw Exception(PARSER_RUNTIME, &svalue, "must be 'sql-string', 'gmt-string' or 'unix-timestamp'");
373: valid_options++;
1.8 moko 374: } else if(key == "indent"){
375: json.indent=r.process_to_value(*value).as_bool() ? "":NULL;
376: valid_options++;
1.6 misha 377: } else if(key == "table" && value->is_string()){
378: const String& svalue=value->as_string();
379: if(!json.set_table_format(svalue))
1.13 moko 380: throw Exception(PARSER_RUNTIME, &svalue, "must be 'array', 'object' or 'compact'");
1.6 misha 381: valid_options++;
382: } else if(key == "file" && value->is_string()){
383: const String& svalue=value->as_string();
384: if(!json.set_file_format(svalue))
1.19 misha 385: throw Exception(PARSER_RUNTIME, &svalue, "must be 'base64', 'text' or 'stat'");
1.6 misha 386: valid_options++;
1.14 misha 387: #ifdef XML
388: } else if(key == "xdoc" && (vvalue = value->get_hash())){
389: json.xdoc_options=new XDocOutputOptions(r, vvalue);
390: valid_options++;
391: #endif
1.6 misha 392: } else if(Junction* junction=value->get_junction()){
1.13 moko 393: if(!junction->method || !junction->method->params_names || junction->method->params_names->count() != 3)
394: throw Exception(PARSER_RUNTIME, 0, "$.%s must be parser method with 3 parameters", key.cstr());
1.6 misha 395: methods->put(key, value);
396: valid_options++;
397: }
398: }
1.22 ! moko 399:
1.6 misha 400: if(valid_options!=options->count())
401: throw Exception(PARSER_RUNTIME, 0, CALLED_WITH_INVALID_OPTION);
1.22 ! moko 402:
! 403: // special handling for $._default
! 404: if(VHash* vhash=static_cast<VHash*>(params[1].as(VHASH_TYPE)))
! 405: if(Value* value=vhash->get_default()) {
! 406: Junction* junction=value->get_junction();
! 407: if(!junction || !junction->method || !junction->method->params_names || junction->method->params_names->count() != 3)
! 408: throw Exception(PARSER_RUNTIME, 0, "$.%s must be parser method with 3 parameters", HASH_DEFAULT_ELEMENT_NAME);
! 409: json.default_method=value;
! 410: }
! 411:
1.6 misha 412: if(methods->count())
413: json.methods=methods;
414: }
1.14 misha 415:
1.21 moko 416: const String& result_string=value_json_string(String::Body(), params[0], json);
1.13 moko 417: String::Body result_body=result_string.cstr_to_string_body_untaint(String::L_JSON, 0, &r.charsets);
418: r.write_pass_lang(*new String(result_body, String::L_AS_IS));
1.6 misha 419: }
420:
1.1 misha 421: // constructor
422:
423: MJson::MJson(): Methoded("json") {
424: add_native_method("parse", Method::CT_STATIC, _parse, 1, 2);
1.6 misha 425:
426: add_native_method("string", Method::CT_ANY, _string, 1, 2);
1.1 misha 427: }
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