Annotation of parser3/src/classes/op.C, revision 1.129
1.1 paf 1: /** @file
1.9 paf 2: Parser: parser @b operators.
1.1 paf 3:
1.129 ! paf 4: Copyright (c) 2001-2003 ArtLebedev Group (http://www.artlebedev.com)
1.71 paf 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.98 paf 6: */
1.1 paf 7:
1.129 ! paf 8: static const char* IDENT_OP_C="$Date: 2003/07/23 08:18:54 $";
1.1 paf 9:
1.13 paf 10: #include "classes.h"
1.129 ! paf 11: #include "pa_vmethod_frame.h"
! 12:
1.1 paf 13: #include "pa_common.h"
14: #include "pa_request.h"
15: #include "pa_vint.h"
16: #include "pa_sql_connection.h"
1.79 paf 17: #include "pa_vdate.h"
1.105 paf 18: #include "pa_vmethod_frame.h"
1.129 ! paf 19: #include "pa_vclass.h"
1.1 paf 20:
1.18 parser 21: // limits
22:
23: #define MAX_LOOPS 10000
24:
1.10 paf 25: // defines
26:
1.82 paf 27: #define CASE_DEFAULT_VALUE "DEFAULT"
1.11 paf 28:
1.10 paf 29: // class
30:
1.113 paf 31: class VClassMAIN: public VClass {
1.10 paf 32: public:
1.129 ! paf 33: VClassMAIN();
1.10 paf 34: };
35:
1.129 ! paf 36: // defines for statics
! 37:
! 38: #define SWITCH_DATA_NAME "SWITCH-DATA"
! 39: #define CACHE_DATA_NAME "CACHE-DATA"
! 40: #define EXCEPTION_VAR_NAME "exception"
! 41:
! 42: // statics
! 43:
! 44: //^switch ^case
! 45: static const String switch_data_name(SWITCH_DATA_NAME);
! 46: //^cache
! 47: static const String cache_data_name(CACHE_DATA_NAME);
! 48:
! 49: static const String exception_var_name(EXCEPTION_VAR_NAME);
! 50:
! 51: // helpers
! 52:
! 53: class Untaint_lang_name2enum: public Hash<const StringBody, String::Language> {
! 54: public:
! 55: Untaint_lang_name2enum() {
! 56: #define ULN(name, LANG) \
! 57: put(StringBody(name), (value_type)(String::L_##LANG));
! 58: ULN("as-is", AS_IS);
! 59: ULN("optimized-as-is", AS_IS|String::L_OPTIMIZE_BIT);
! 60: ULN("file-spec", FILE_SPEC);
! 61: ULN("http-header", HTTP_HEADER);
! 62: ULN("mail-header", MAIL_HEADER);
! 63: ULN("uri", URI);
! 64: ULN("table", TABLE);
! 65: ULN("sql", SQL);
! 66: ULN("js", JS);
! 67: ULN("xml", XML);
! 68: ULN("optimized-xml", XML|String::L_OPTIMIZE_BIT);
! 69: ULN("html", HTML);
! 70: ULN("optimized-html", HTML|String::L_OPTIMIZE_BIT);
! 71: #undef ULN
! 72: }
! 73: } untaint_lang_name2enum;
! 74:
1.10 paf 75: // methods
76:
1.129 ! paf 77: static void _if(Request& r, MethodParams& params) {
! 78: Value& condition_code=params.as_junction(0, "condition must be expression");
1.1 paf 79:
1.81 paf 80: bool condition=r.process_to_value(condition_code,
1.83 paf 81: /*0/*no name* /,*/
1.1 paf 82: false/*don't intercept string*/).as_bool();
1.6 paf 83: if(condition)
1.129 ! paf 84: r.write_pass_lang(r.process(params.as_junction(1, "'then' parameter must be code")));
! 85: else if(params.count()>2)
! 86: r.write_pass_lang(r.process(params.as_junction(2, "'else' parameter must be code")));
1.1 paf 87: }
88:
1.129 ! paf 89: static void _untaint(Request& r, MethodParams& params) {
1.1 paf 90:
1.129 ! paf 91: String::Language lang;
! 92: if(params.count()==1)
! 93: lang=String::L_AS_IS; // mark as simply 'tainted'. useful in html from sql
1.59 paf 94: else {
1.129 ! paf 95: const String& lang_name=params.as_string(0, "lang must be string");
! 96: lang=untaint_lang_name2enum.get(lang_name);
1.59 paf 97: if(!lang)
1.78 paf 98: throw Exception(0,
1.59 paf 99: &lang_name,
100: "invalid taint language");
101: }
1.1 paf 102:
103: {
1.129 ! paf 104: Value& vbody=params.as_junction(params.count()-1, "body must be code");
1.1 paf 105:
106: Temp_lang temp_lang(r, lang); // set temporarily specified ^untaint[language;
1.86 paf 107: r.write_pass_lang(r.process(vbody)); // process marking tainted with that lang
1.1 paf 108: }
109: }
110:
1.129 ! paf 111: static void _taint(Request& r, MethodParams& params) {
! 112: String::Language lang;
! 113: if(params.count()==1)
! 114: lang=String::L_TAINTED; // mark as simply 'tainted'. useful in table:set
1.1 paf 115: else {
1.129 ! paf 116: const String& lang_name=params.as_string(0, "lang must be string");
! 117: lang=untaint_lang_name2enum.get(lang_name);
1.1 paf 118: if(!lang)
1.78 paf 119: throw Exception(0,
1.3 paf 120: &lang_name,
121: "invalid taint language");
1.1 paf 122: }
123:
124: {
1.129 ! paf 125: Value& vbody=params.as_no_junction(params.count()-1, "body must not be code");
1.1 paf 126:
1.129 ! paf 127: String result;
1.1 paf 128: result.append(
129: vbody.as_string(), // process marking tainted with that lang
130: lang, true); // force result language to specified
131: r.write_pass_lang(result);
132: }
133: }
134:
1.129 ! paf 135: static void _process(Request& r, MethodParams& params) {
! 136: Method* main_method;
! 137:
! 138: size_t index=0;
! 139: Value* target_self;
! 140: Value& maybe_target_self=params[index];
! 141: if(maybe_target_self.get_string() || maybe_target_self.get_junction())
! 142: target_self=&r.get_method_frame()->caller()->self();
! 143: else {
! 144: target_self=&maybe_target_self; index++;
! 145: }
! 146:
1.1 paf 147: {
1.129 ! paf 148: VStateless_class *target_class=target_self->get_last_derived_class();
1.116 paf 149: if(!target_class)
150: throw Exception("parser.runtime",
1.129 ! paf 151: 0,
1.116 paf 152: "no target class");
1.114 paf 153:
1.73 paf 154: // temporary remove language change
1.129 ! paf 155: Temp_lang temp_lang(r, String::L_PASS_APPENDED);
1.1 paf 156: // temporary zero @main so to maybe-replace it in processed code
1.129 ! paf 157: Temp_method temp_method_main(*target_class, main_method_name, 0);
1.1 paf 158: // temporary zero @auto so it wouldn't be auto-called in Request::use_buf
1.129 ! paf 159: Temp_method temp_method_auto(*target_class, auto_method_name, 0);
! 160:
! 161: size_t main_alias_index=index+1;
! 162: const String* main_alias=0;
! 163: if(main_alias_index<params.count())
! 164: main_alias=¶ms.as_string(main_alias_index, "main alias must be string");
! 165:
! 166: if(const String* file_name=params[index].get_string()) { // ^process...[file]
! 167: r.use_file(*target_class, r.absolute(*file_name), main_alias, true/*ignore_class_path*/);
! 168: } else { // process...{string}
! 169: Value& vjunction=params.as_junction(index, "body must be code");
! 170: // evaluate source to process
! 171: const String& source=r.process_to_string(vjunction);
! 172: r.use_buf(*target_class,
! 173: source.cstr(String::L_UNSPECIFIED, r.connection(false)),
! 174: main_alias,
! 175: pseudo_file_no__process);
! 176: }
1.1 paf 177:
1.73 paf 178: // main_method
1.129 ! paf 179: main_method=target_class->get_method(main_method_name);
1.73 paf 180: }
181: // after restoring current-request-lang
182: // maybe-execute @main[]
183: if(main_method) {
1.119 paf 184: // temporarily set method_frame's self to target_self
1.129 ! paf 185: Temp_method_frame_self tmfs(*r.get_method_frame(), *target_self);
1.73 paf 186: // execute!
187: r.execute(*main_method->parser_code);
1.1 paf 188: }
189: }
190:
1.129 ! paf 191: static void _rem(Request& r, MethodParams& params) {
! 192: params.as_junction(0, "body must be code");
1.1 paf 193: }
194:
1.129 ! paf 195: static void _while(Request& r, MethodParams& params) {
! 196: Value& vcondition=params.as_junction(0, "condition must be expression");
! 197: Value& body=params.as_junction(1, "body must be code");
1.1 paf 198:
199: // while...
200: int endless_loop_count=0;
201: while(true) {
1.18 parser 202: if(++endless_loop_count>=MAX_LOOPS) // endless loop?
1.78 paf 203: throw Exception("parser.runtime",
1.129 ! paf 204: 0,
1.1 paf 205: "endless loop detected");
206:
1.86 paf 207: bool condition=r.process_to_value(vcondition,
1.83 paf 208: /*0/*no name* /,*/
1.1 paf 209: false/*don't intercept string*/).as_bool();
210: if(!condition) // ...condition is true
211: break;
212:
213: // write processed body
1.86 paf 214: r.write_pass_lang(r.process(body));
1.1 paf 215: }
216: }
217:
1.129 ! paf 218: static void _use(Request& r, MethodParams& params) {
! 219: Value& vfile=params.as_no_junction(0, "file name must not be code");
1.113 paf 220: r.use_file(r.main_class, vfile.as_string());
1.1 paf 221: }
222:
1.129 ! paf 223: static void _for(Request& r, MethodParams& params) {
! 224: const String& var_name=params.as_string(0, "var name must be string");
! 225: int from=params.as_int(1, "from must be int", r);
! 226: int to=params.as_int(2, "to must be int", r);
! 227: Value& body_code=params.as_junction(3, "body must be code");
! 228: Value* delim_maybe_code=params.count()>4?¶ms[4]:0;
1.1 paf 229:
1.57 paf 230: if(to-from>=MAX_LOOPS) // too long loop?
1.78 paf 231: throw Exception("parser.runtime",
1.129 ! paf 232: 0,
1.57 paf 233: "endless loop detected");
234:
1.1 paf 235: bool need_delim=false;
1.129 ! paf 236: VInt* vint=new VInt(0);
1.117 paf 237: r.get_method_frame()->caller()->put_element(var_name, vint, false);
1.1 paf 238: for(int i=from; i<=to; i++) {
239: vint->set_int(i);
240:
1.108 paf 241: StringOrValue sv_processed=r.process(body_code);
1.129 ! paf 242: const String* s_processed=sv_processed.get_string();
! 243: if(delim_maybe_code && s_processed && s_processed->length()) { // delimiter set and we have body
1.108 paf 244: if(need_delim) // need delim & iteration produced string?
1.86 paf 245: r.write_pass_lang(r.process(*delim_maybe_code));
1.1 paf 246: need_delim=true;
247: }
1.108 paf 248: r.write_pass_lang(sv_processed);
1.1 paf 249: }
250: }
251:
1.129 ! paf 252: static void _eval(Request& r, MethodParams& params) {
! 253: Value& expr=params.as_junction(0, "need expression");
1.1 paf 254: // evaluate expresion
1.129 ! paf 255: Value& value_result=r.process_to_value(expr,
1.83 paf 256: /*0/*no name YET* /,*/
1.1 paf 257: true/*don't intercept string*/).as_expr_result();
1.129 ! paf 258: if(params.count()>1) {
! 259: Value& fmt=params.as_no_junction(1, "fmt must not be code");
! 260: r.write_no_lang(String(format(value_result.as_double(), fmt.as_string().cstrm())));
1.91 paf 261: } else
1.129 ! paf 262: r.write_no_lang(value_result);
1.1 paf 263: }
264:
1.129 ! paf 265: static void _connect(Request& r, MethodParams& params) {
1.63 paf 266: #ifdef RESOURCES_DEBUG
267: struct timeval mt[2];
268: #endif
1.129 ! paf 269: Value& url=params.as_no_junction(0, "url must not be code");
! 270: Value& body_code=params.as_junction(1, "body must be code");
1.1 paf 271:
1.129 ! paf 272: Table* protocol2driver_and_client=0;
! 273: if(Value* sql=r.main_class.get_element(String(MAIN_SQL_NAME), r.main_class, false)) {
! 274: if(Value* element=sql->get_element(String(MAIN_SQL_DRIVERS_NAME), *sql, false)) {
1.113 paf 275: protocol2driver_and_client=element->get_table();
276: }
277: }
1.11 paf 278:
1.63 paf 279: #ifdef RESOURCES_DEBUG
280: //measure:before
281: gettimeofday(&mt[0],NULL);
282: #endif
1.1 paf 283: // connect
1.129 ! paf 284: SQL_Connection* connection=SQL_driver_manager.get_connection(url.as_string(),
! 285: protocol2driver_and_client);
1.1 paf 286:
1.63 paf 287: #ifdef RESOURCES_DEBUG
288: //measure:after connect
289: gettimeofday(&mt[1],NULL);
290:
291: double t[2];
292: for(int i=0;i<2;i++)
293: t[i]=mt[i].tv_sec+mt[i].tv_usec/1000000.0;
294:
295: r.sql_connect_time+=t[1]-t[0];
296: #endif
1.129 ! paf 297: Temp_connection temp_connection(r, connection);
1.1 paf 298: // execute body
1.53 parser 299: try {
1.86 paf 300: r.write_assign_lang(r.process(body_code));
1.129 ! paf 301: connection->commit();
! 302: connection->close();
1.75 paf 303: } catch(...) { // process problem
1.129 ! paf 304: connection->rollback();
! 305: connection->close();
! 306: rethrow;
1.1 paf 307: }
308: }
309:
1.41 parser 310: #ifndef DOXYGEN
1.129 ! paf 311: class Switch_data: public PA_Object {
! 312: public:
! 313: Request& r;
! 314: Value& searching;
! 315: Value* found;
! 316: Value* _default;
! 317: public:
! 318: Switch_data(Request& ar, Value& asearching):
! 319: r(ar), searching(asearching) {}
1.28 parser 320: };
1.41 parser 321: #endif
1.129 ! paf 322: static void _switch(Request& r, MethodParams& params) {
! 323: Switch_data* data=new Switch_data(r, r.process_to_value(params[0]));
! 324: Temp_hash_value<const StringBody, PA_Object*>
! 325: switch_data_setter(r.classes_conf, switch_data_name, data);
1.28 parser 326:
1.129 ! paf 327: Value& cases_code=params.as_junction(1, "switch cases must be code");
1.82 paf 328: // execution of found ^case[...]{code} must be in context of ^switch[...]{code}
329: // because of stacked WWrapper used there as wcontext
1.84 paf 330: r.process(cases_code, true/*intercept_string*/);
1.129 ! paf 331: if(Value* selected_code=data->found? data->found: data->_default) {
1.83 paf 332: // setting code context, would execute in ^switch[...]{>>context<<}
1.105 paf 333: //selected_code->get_junction()->change_context(cases_code.get_junction());
1.107 paf 334: r.write_pass_lang(r.process(*selected_code));
1.83 paf 335: }
1.28 parser 336: }
337:
1.129 ! paf 338: static void _case(Request& r, MethodParams& params) {
! 339: Switch_data* data=static_cast<Switch_data*>(r.classes_conf.get(switch_data_name));
1.38 parser 340: if(!data)
1.78 paf 341: throw Exception("parser.runtime",
1.129 ! paf 342: 0,
1.38 parser 343: "without switch");
1.28 parser 344:
1.129 ! paf 345: int count=params.count();
! 346: Value& code=params.as_junction(--count, "case result must be code");
1.83 paf 347:
348: // killing context for safety, would execute in ^switch[...]{>>context<<}
349: // reason: context is stacked, and it would become invalid afterwards
1.105 paf 350: //code->get_junction()->change_context(0);
1.83 paf 351:
1.28 parser 352: for(int i=0; i<count; i++) {
1.129 ! paf 353: Value& value=r.process_to_value(params[i]);
1.28 parser 354:
1.82 paf 355: if(value.as_string() == CASE_DEFAULT_VALUE) {
1.129 ! paf 356: data->_default=&code;
1.28 parser 357: break;
358: }
359:
360: bool matches;
1.129 ! paf 361: if(data->searching.is_string())
! 362: matches=data->searching.as_string() == value.as_string();
1.28 parser 363: else
1.129 ! paf 364: matches=data->searching.as_double() == value.as_double();
1.28 parser 365:
366: if(matches) {
1.82 paf 367: if(data->found)
368: throw Exception("parser.runtime",
1.129 ! paf 369: 0,
1.82 paf 370: "duplicate found");
371:
1.129 ! paf 372: data->found=&code;
1.28 parser 373: break;
374: }
375: }
376: }
377:
1.63 paf 378: // cache--
379:
380: // consts
381:
1.129 ! paf 382: const int DATA_STRING_SERIALIZED_VERSION=0x0004;
1.63 paf 383:
384: // helper types
385:
386: #ifndef DOXYGEN
387: struct Data_string_serialized_prolog {
388: int version;
1.79 paf 389: time_t expires;
1.63 paf 390: };
391: #endif
392:
1.68 paf 393: void cache_delete(const String& file_spec) {
394: file_delete(file_spec, false/*fail_on_read_problem*/);
1.63 paf 395: }
1.69 paf 396:
397: #ifndef DOXYGEN
1.129 ! paf 398: class Cache_data: public PA_Object {
! 399: public:
1.79 paf 400: time_t expires;
401: };
1.69 paf 402: struct Locked_process_and_cache_put_action_info {
403: Request *r;
1.79 paf 404: Cache_data *data;
1.129 ! paf 405: Value* body_code; const String* evaluated_body;
1.69 paf 406: };
407: #endif
1.129 ! paf 408: /* @todo maybe network order worth spending some effort?
! 409: don't bothering myself with network byte order,
! 410: am not planning to be able to move resulting file across platforms
! 411: */
1.69 paf 412: static void locked_process_and_cache_put_action(int f, void *context) {
413: Locked_process_and_cache_put_action_info& info=
414: *static_cast<Locked_process_and_cache_put_action_info *>(context);
1.129 ! paf 415:
1.69 paf 416: // body->process
1.81 paf 417: info.evaluated_body=&info.r->process_to_string(*info.body_code);
1.69 paf 418:
1.79 paf 419: // expiration time not spoiled by ^cache(0) or something?
420: if(info.data->expires > time(0)) {
421: // string -serialize> buffer
1.129 ! paf 422: String::Cm serialized=info.evaluated_body->serialize(
! 423: sizeof(Data_string_serialized_prolog));
1.79 paf 424: Data_string_serialized_prolog& prolog=
1.129 ! paf 425: *reinterpret_cast<Data_string_serialized_prolog *>(serialized.str);
1.79 paf 426: prolog.version=DATA_STRING_SERIALIZED_VERSION;
427: prolog.expires=info.data->expires;
428:
429: // buffer -write> file
1.129 ! paf 430: write(f, serialized.str, serialized.length);
1.79 paf 431: } else // expired!
432: info.data->expires=0; // flag it so that could be easily checked by caller
1.69 paf 433: }
1.129 ! paf 434: const String* locked_process_and_cache_put(Request& r,
1.128 paf 435: Value& body_code,
436: Cache_data& data,
437: const String& file_spec) {
1.129 ! paf 438: Locked_process_and_cache_put_action_info info={0};
! 439: info.r=&r;
! 440: info.data=&data;
! 441: info.body_code=&body_code;
1.69 paf 442:
1.129 ! paf 443: const String* result=file_write_action_under_lock(
1.69 paf 444: file_spec,
445: "cache_put", locked_process_and_cache_put_action, &info,
446: false/*as_text*/,
447: false/*do_append*/,
1.96 paf 448: false/*block*/,
449: false/*fail on lock problem*/) ? info.evaluated_body: 0;
1.100 paf 450: time_t now=time(0);
451: if(data.expires<=now)
1.79 paf 452: cache_delete(file_spec);
453: return result;
1.63 paf 454: }
1.129 ! paf 455: const String* cache_get(Request_charsets& charsets, const String& file_spec, time_t now) {
! 456: File_read_result file=file_read(charsets, file_spec,
1.63 paf 457: false/*as_text*/,
1.129 ! paf 458: 0, //no params
! 459: false/*fail_on_read_problem*/);
! 460: if(file.success && file.length/* ignore reads which are empty due to
1.72 paf 461: non-unary open+lockEX conflict with lockSH */) {
1.129 ! paf 462:
1.72 paf 463: Data_string_serialized_prolog& prolog=
1.129 ! paf 464: *reinterpret_cast<Data_string_serialized_prolog *>(file.str);
1.63 paf 465:
1.129 ! paf 466: String* result=new String;
1.72 paf 467: if(
1.129 ! paf 468: file.length>=sizeof(Data_string_serialized_prolog)
1.72 paf 469: && prolog.version==DATA_STRING_SERIALIZED_VERSION
1.79 paf 470: && prolog.expires > now
1.129 ! paf 471: && result->deserialize(sizeof(Data_string_serialized_prolog), file.str, file.length))
1.72 paf 472: return result;
473: }
1.63 paf 474:
1.72 paf 475: return 0;
1.63 paf 476: }
1.129 ! paf 477: static time_t as_expires(Request& r, MethodParams& params,
1.79 paf 478: int index, time_t now) {
479: time_t result;
1.129 ! paf 480: if(Value* vdate=params[index].as(VDATE_TYPE, false))
! 481: result=static_cast<VDate*>(vdate)->get_time();
1.79 paf 482: else
1.129 ! paf 483: result=now+(time_t)params.as_double(index, "lifespan must be date or number", r);
1.79 paf 484:
485: return result;
486: }
1.129 ! paf 487: static const String& as_file_spec(Request& r, MethodParams& params, int index) {
! 488: return r.absolute(params.as_string(index, "filespec must be string"));
1.79 paf 489: }
1.129 ! paf 490: static void _cache(Request& r, MethodParams& params) {
1.79 paf 491: time_t now=time(0);
492:
493: // ^cache[filename] ^cache(seconds) ^cache[expires date]
1.129 ! paf 494: if(params.count()==1) {
! 495: if(params[0].is_string()) { // filename?
1.79 paf 496: cache_delete(as_file_spec(r, params, 0));
497: return;
498: }
499:
500: // secods|expires date
1.129 ! paf 501: Cache_data* data=static_cast<Cache_data*>(r.classes_conf.get(cache_data_name));
1.79 paf 502: if(!data)
503: throw Exception("parser.runtime",
1.129 ! paf 504: 0,
1.79 paf 505: "expire-time reducing instruction without cache");
506:
1.129 ! paf 507: time_t expires=as_expires(r, params, 0, now);
1.79 paf 508: if(expires < data->expires)
509: data->expires=expires;
510:
511: return;
512: }
1.63 paf 513:
514: // file_spec, expires, body code
1.129 ! paf 515: const String& file_spec=r.absolute(params.as_string(0, "filespec must be string"));
1.65 paf 516:
1.129 ! paf 517: Cache_data* data=new Cache_data;
! 518: Temp_hash_value<const StringBody, PA_Object*>
! 519: cache_data_setter(r.classes_conf, cache_data_name, data);
! 520: data->expires=as_expires(r, params, 1, now);
! 521: Value& body_code=params.as_junction(2, "body must be code");
1.63 paf 522:
1.129 ! paf 523: if(data->expires>now) { // valid 'expires' specified? try cached copy...
1.69 paf 524: // hence we don't hope to have unary create/lockEX
525: // we need some plan to live in a life like that, so...
526: // worst races plan:
527: // A B
528: // open
529: // |open
530: // lockSH
531: // |nonblocking-lockEX fails
532: // unlockSH
533: // close, cache_get returns 0
534: // open
535: // nonblocking-lockEX succeeds; process, write, close
536: // |retry1: open
537: // ...
538: // |lockSH succeeds; ...
539:
540: for(int retry=0; retry<2; retry++) {
1.129 ! paf 541: if(const String* cached_body=cache_get(r.charsets, file_spec, now)) { // have cached copy?
1.79 paf 542: // write it out
543: r.write_assign_lang(*cached_body);
544: // happy with it
545: return;
546: }
1.69 paf 547:
548: // non-blocked lock; process; cache it
1.129 ! paf 549: if(const String* processed_body=
! 550: locked_process_and_cache_put(r, body_code, *data, file_spec)) {
1.63 paf 551: // write it out
1.69 paf 552: r.write_assign_lang(*processed_body);
1.63 paf 553: // happy with it
554: return;
1.69 paf 555: } else { // somebody writing result right now
556: pa_sleep(0, 500000); // waiting half a second
557: retry=0; // prolonging our wait, than could cache_get it, without processing body_code
1.63 paf 558: }
1.69 paf 559: }
1.78 paf 560: throw Exception(0,
1.69 paf 561: &file_spec,
562: "locking problem");
563: } else {
1.79 paf 564: // instructed not to cache; forget cached copy
1.68 paf 565: cache_delete(file_spec);
1.69 paf 566: // process
1.81 paf 567: const String& processed_body=r.process_to_string(body_code);
1.69 paf 568: // write it out
569: r.write_assign_lang(processed_body);
570: // happy with it
571: return;
572: }
573: // never reached
1.63 paf 574: }
575:
1.74 paf 576:
577:
1.129 ! paf 578: // also used in pa_request.C to pass param to @unhandled_exception
1.74 paf 579:
1.129 ! paf 580: static void _try_operator(Request& r, MethodParams& params) {
! 581: Value& body_code=params.as_junction(0, "body_code must be code");
! 582: Value& catch_code=params.as_junction(1, "catch_code must be code");
1.74 paf 583:
1.86 paf 584: StringOrValue result;
1.123 paf 585: // taking snapshot of try-context
586: Request_context_saver try_context(r);
1.74 paf 587: try {
1.86 paf 588: result=r.process(body_code);
1.74 paf 589: } catch(const Exception& e) {
1.129 ! paf 590: Request::Exception_details details=r.get_details(e);
! 591:
1.123 paf 592: Request_context_saver throw_context(r); // taking snapshot of throw-context [stack trace contains error]
593: try_context.restore(); // restoring try-context to perform catch-code
594:
1.129 ! paf 595: Junction* junction=catch_code.get_junction();
! 596: Value* method_frame=junction->method_frame;
! 597: Value* saved_exception_var_value=method_frame->get_element(exception_var_name, *method_frame, false);
! 598: junction->method_frame->put_element(exception_var_name, &details.vhash, false);
1.86 paf 599: result=r.process(catch_code);
1.74 paf 600: bool handled=false;
1.129 ! paf 601: if(Value* value=
! 602: details.vhash.hash().get(exception_handled_part_name))
1.74 paf 603: handled=value->as_bool();
1.129 ! paf 604: junction->method_frame->put_element(exception_var_name, saved_exception_var_value, false);
1.74 paf 605:
1.123 paf 606: if(!handled) {
607: throw_context.restore(); // restoring throw-context [exception were not handled]
1.129 ! paf 608: rethrow;
1.123 paf 609: }
1.74 paf 610: }
1.123 paf 611: // write out result
1.86 paf 612: r.write_pass_lang(result);
1.74 paf 613: }
614:
1.129 ! paf 615: static void _throw_operator(Request& r, MethodParams& params) {
! 616: if(params.count()==1) {
! 617: if(HashStringValue *hash=params[0].get_hash()) {
! 618: const char* type=0;
! 619: if(Value* value=hash->get(exception_type_part_name))
1.78 paf 620: type=value->as_string().cstr();
1.129 ! paf 621: const String* source=0;
! 622: if(Value* value=hash->get(exception_source_part_name))
1.74 paf 623: source=&value->as_string();
1.129 ! paf 624: const char* comment;
! 625: if(Value* value=hash->get(exception_comment_part_name))
1.74 paf 626: comment=value->as_string().cstr();
627:
1.78 paf 628: throw Exception(type,
1.129 ! paf 629: source?source:0,
! 630: "%s", comment?comment:"");
1.74 paf 631: } else
1.78 paf 632: throw Exception("parser.runtime",
1.129 ! paf 633: 0,
1.74 paf 634: "one-param version has hash param");
635: } else {
1.129 ! paf 636: const char* type=params.as_string(0, "type must be string").cstr();
! 637: const String& source=params.as_string(1, "source must be string");
! 638: const char* comment=params.count()>2? params.as_string(2, "comment must be string").cstr()
! 639: :0;
1.97 paf 640: throw Exception(type, &source, "%s", comment?comment:"");
1.74 paf 641: }
642: }
1.129 ! paf 643:
! 644: #if defined(WIN32) && defined(_DEBUG)
! 645: # define PA_BPT
! 646: static void _bpt(Request& r, MethodParams& params) {
! 647: _asm int 3;
! 648: }
! 649: #endif
! 650:
1.10 paf 651: // constructor
652:
1.129 ! paf 653: VClassMAIN::VClassMAIN(): VClass() {
! 654: set_name(*new String(MAIN_CLASS_NAME));
! 655:
! 656: #ifdef PA_BPT
! 657: // ^bpt[]
! 658: add_native_method("bpt", Method::CT_ANY, _bpt, 0, 0);
! 659: #endif
1.121 paf 660:
1.1 paf 661: // ^if(condition){code-when-true}
662: // ^if(condition){code-when-true}{code-when-false}
1.10 paf 663: add_native_method("if", Method::CT_ANY, _if, 2, 3);
1.1 paf 664:
665: // ^untaint[as-is|uri|sql|js|html|html-typo]{code}
1.59 paf 666: add_native_method("untaint", Method::CT_ANY, _untaint, 1, 2);
1.1 paf 667:
668: // ^taint[as-is|uri|sql|js|html|html-typo]{code}
1.10 paf 669: add_native_method("taint", Method::CT_ANY, _taint, 1, 2);
1.1 paf 670:
671: // ^process[code]
1.116 paf 672: add_native_method("process", Method::CT_ANY, _process, 1, 2);
1.1 paf 673:
674: // ^rem{code}
1.51 parser 675: add_native_method("rem", Method::CT_ANY, _rem, 1, 10000);
1.1 paf 676:
677: // ^while(condition){code}
1.10 paf 678: add_native_method("while", Method::CT_ANY, _while, 2, 2);
1.1 paf 679:
680: // ^use[file]
1.10 paf 681: add_native_method("use", Method::CT_ANY, _use, 1, 1);
1.1 paf 682:
1.54 paf 683: // ^for[i](from-number;to-number-inclusive){code}[delim]
1.10 paf 684: add_native_method("for", Method::CT_ANY, _for, 3+1, 3+1+1);
1.1 paf 685:
686: // ^eval(expr)
687: // ^eval(expr)[format]
1.10 paf 688: add_native_method("eval", Method::CT_ANY, _eval, 1, 2);
1.52 parser 689:
1.1 paf 690: // ^connect[protocol://user:pass@host[:port]/database]{code with ^sql-s}
1.10 paf 691: add_native_method("connect", Method::CT_ANY, _connect, 2, 2);
692:
1.63 paf 693:
1.65 paf 694: // ^cache[file_spec] delete cache
1.63 paf 695: // ^cache[file_spec](time){code} time=0 no cache
1.65 paf 696: add_native_method("cache", Method::CT_ANY, _cache, 1, 3);
1.63 paf 697:
1.28 parser 698: // switch
699:
700: // ^switch[value]{cases}
701: add_native_method("switch", Method::CT_ANY, _switch, 2, 2);
702:
703: // ^case[value]{code}
1.51 parser 704: add_native_method("case", Method::CT_ANY, _case, 2, 10000);
1.74 paf 705:
706: // try-catch
707:
708: // ^try{code}{catch code}
709: add_native_method("try", Method::CT_ANY, _try_operator, 2, 2);
710: // ^throw[$exception hash]
711: // ^throw[type;source;comment]
712: add_native_method("throw", Method::CT_ANY, _throw_operator, 1, 3);
713:
1.10 paf 714: }
1.11 paf 715:
716: // constructor & configurator
1.1 paf 717:
1.129 ! paf 718: VStateless_class& VClassMAIN_create() {
! 719: return *new VClassMAIN;
1.1 paf 720: }
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