Annotation of parser3/src/classes/op.C, revision 1.145
1.1 paf 1: /** @file
1.9 paf 2: Parser: parser @b operators.
1.1 paf 3:
1.145 ! paf 4: Copyright (c) 2001-2004 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:
1.145 ! paf 8: static const char * const IDENT_OP_C="$Date: 2003/12/22 11:44:34 $";
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"
1.134 paf 14: #include "pa_os.h"
1.1 paf 15: #include "pa_request.h"
16: #include "pa_vint.h"
17: #include "pa_sql_connection.h"
1.79 paf 18: #include "pa_vdate.h"
1.105 paf 19: #include "pa_vmethod_frame.h"
1.129 paf 20: #include "pa_vclass.h"
1.144 paf 21: #include "pa_charset.h"
1.1 paf 22:
1.18 parser 23: // limits
24:
25: #define MAX_LOOPS 10000
26:
1.10 paf 27: // defines
28:
1.82 paf 29: #define CASE_DEFAULT_VALUE "DEFAULT"
1.11 paf 30:
1.10 paf 31: // class
32:
1.113 paf 33: class VClassMAIN: public VClass {
1.10 paf 34: public:
1.129 paf 35: VClassMAIN();
1.10 paf 36: };
37:
1.129 paf 38: // defines for statics
39:
40: #define SWITCH_DATA_NAME "SWITCH-DATA"
41: #define CACHE_DATA_NAME "CACHE-DATA"
42: #define EXCEPTION_VAR_NAME "exception"
43:
44: // statics
45:
46: //^switch ^case
47: static const String switch_data_name(SWITCH_DATA_NAME);
48: //^cache
49: static const String cache_data_name(CACHE_DATA_NAME);
50:
51: static const String exception_var_name(EXCEPTION_VAR_NAME);
52:
1.136 paf 53: // local defines
54:
55: #define CACHE_EXCEPTION_HANDLED_CACHE_NAME "cache"
56:
1.129 paf 57: // helpers
58:
1.130 paf 59: class Untaint_lang_name2enum: public Hash<const String::Body, String::Language> {
1.129 paf 60: public:
61: Untaint_lang_name2enum() {
62: #define ULN(name, LANG) \
1.130 paf 63: put(String::Body(name), (value_type)(String::L_##LANG));
1.129 paf 64: ULN("as-is", AS_IS);
65: ULN("optimized-as-is", AS_IS|String::L_OPTIMIZE_BIT);
66: ULN("file-spec", FILE_SPEC);
67: ULN("http-header", HTTP_HEADER);
68: ULN("mail-header", MAIL_HEADER);
69: ULN("uri", URI);
70: ULN("table", TABLE);
71: ULN("sql", SQL);
72: ULN("js", JS);
73: ULN("xml", XML);
74: ULN("optimized-xml", XML|String::L_OPTIMIZE_BIT);
75: ULN("html", HTML);
76: ULN("optimized-html", HTML|String::L_OPTIMIZE_BIT);
77: #undef ULN
78: }
79: } untaint_lang_name2enum;
80:
1.10 paf 81: // methods
82:
1.129 paf 83: static void _if(Request& r, MethodParams& params) {
84: Value& condition_code=params.as_junction(0, "condition must be expression");
1.1 paf 85:
1.81 paf 86: bool condition=r.process_to_value(condition_code,
1.1 paf 87: false/*don't intercept string*/).as_bool();
1.6 paf 88: if(condition)
1.129 paf 89: r.write_pass_lang(r.process(params.as_junction(1, "'then' parameter must be code")));
90: else if(params.count()>2)
91: r.write_pass_lang(r.process(params.as_junction(2, "'else' parameter must be code")));
1.1 paf 92: }
93:
1.129 paf 94: static void _untaint(Request& r, MethodParams& params) {
1.1 paf 95:
1.129 paf 96: String::Language lang;
97: if(params.count()==1)
98: lang=String::L_AS_IS; // mark as simply 'tainted'. useful in html from sql
1.59 paf 99: else {
1.129 paf 100: const String& lang_name=params.as_string(0, "lang must be string");
101: lang=untaint_lang_name2enum.get(lang_name);
1.59 paf 102: if(!lang)
1.78 paf 103: throw Exception(0,
1.59 paf 104: &lang_name,
105: "invalid taint language");
106: }
1.1 paf 107:
108: {
1.129 paf 109: Value& vbody=params.as_junction(params.count()-1, "body must be code");
1.1 paf 110:
111: Temp_lang temp_lang(r, lang); // set temporarily specified ^untaint[language;
1.86 paf 112: r.write_pass_lang(r.process(vbody)); // process marking tainted with that lang
1.1 paf 113: }
114: }
115:
1.129 paf 116: static void _taint(Request& r, MethodParams& params) {
117: String::Language lang;
118: if(params.count()==1)
119: lang=String::L_TAINTED; // mark as simply 'tainted'. useful in table:set
1.1 paf 120: else {
1.129 paf 121: const String& lang_name=params.as_string(0, "lang must be string");
122: lang=untaint_lang_name2enum.get(lang_name);
1.1 paf 123: if(!lang)
1.78 paf 124: throw Exception(0,
1.3 paf 125: &lang_name,
126: "invalid taint language");
1.1 paf 127: }
128:
129: {
1.129 paf 130: Value& vbody=params.as_no_junction(params.count()-1, "body must not be code");
1.1 paf 131:
1.129 paf 132: String result;
1.1 paf 133: result.append(
134: vbody.as_string(), // process marking tainted with that lang
135: lang, true); // force result language to specified
136: r.write_pass_lang(result);
137: }
138: }
139:
1.129 paf 140: static void _process(Request& r, MethodParams& params) {
141: Method* main_method;
142:
143: size_t index=0;
144: Value* target_self;
145: Value& maybe_target_self=params[index];
146: if(maybe_target_self.get_string() || maybe_target_self.get_junction())
147: target_self=&r.get_method_frame()->caller()->self();
148: else {
149: target_self=&maybe_target_self; index++;
150: }
151:
1.1 paf 152: {
1.129 paf 153: VStateless_class *target_class=target_self->get_last_derived_class();
1.116 paf 154: if(!target_class)
155: throw Exception("parser.runtime",
1.129 paf 156: 0,
1.116 paf 157: "no target class");
1.114 paf 158:
1.73 paf 159: // temporary remove language change
1.129 paf 160: Temp_lang temp_lang(r, String::L_PASS_APPENDED);
1.1 paf 161: // temporary zero @main so to maybe-replace it in processed code
1.129 paf 162: Temp_method temp_method_main(*target_class, main_method_name, 0);
1.1 paf 163: // temporary zero @auto so it wouldn't be auto-called in Request::use_buf
1.129 paf 164: Temp_method temp_method_auto(*target_class, auto_method_name, 0);
165:
166: size_t main_alias_index=index+1;
167: const String* main_alias=0;
168: if(main_alias_index<params.count())
169: main_alias=¶ms.as_string(main_alias_index, "main alias must be string");
170:
171: if(const String* file_name=params[index].get_string()) { // ^process...[file]
172: r.use_file(*target_class, r.absolute(*file_name), main_alias, true/*ignore_class_path*/);
173: } else { // process...{string}
174: Value& vjunction=params.as_junction(index, "body must be code");
175: // evaluate source to process
176: const String& source=r.process_to_string(vjunction);
177: r.use_buf(*target_class,
178: source.cstr(String::L_UNSPECIFIED, r.connection(false)),
179: main_alias,
180: pseudo_file_no__process);
181: }
1.1 paf 182:
1.73 paf 183: // main_method
1.129 paf 184: main_method=target_class->get_method(main_method_name);
1.73 paf 185: }
186: // after restoring current-request-lang
187: // maybe-execute @main[]
188: if(main_method) {
1.119 paf 189: // temporarily set method_frame's self to target_self
1.129 paf 190: Temp_method_frame_self tmfs(*r.get_method_frame(), *target_self);
1.73 paf 191: // execute!
192: r.execute(*main_method->parser_code);
1.1 paf 193: }
194: }
195:
1.138 paf 196: static void _rem(Request&, MethodParams& params) {
1.129 paf 197: params.as_junction(0, "body must be code");
1.1 paf 198: }
199:
1.129 paf 200: static void _while(Request& r, MethodParams& params) {
201: Value& vcondition=params.as_junction(0, "condition must be expression");
202: Value& body=params.as_junction(1, "body must be code");
1.1 paf 203:
204: // while...
205: int endless_loop_count=0;
206: while(true) {
1.18 parser 207: if(++endless_loop_count>=MAX_LOOPS) // endless loop?
1.78 paf 208: throw Exception("parser.runtime",
1.129 paf 209: 0,
1.1 paf 210: "endless loop detected");
211:
1.86 paf 212: bool condition=r.process_to_value(vcondition,
1.1 paf 213: false/*don't intercept string*/).as_bool();
214: if(!condition) // ...condition is true
215: break;
216:
217: // write processed body
1.86 paf 218: r.write_pass_lang(r.process(body));
1.1 paf 219: }
220: }
221:
1.129 paf 222: static void _use(Request& r, MethodParams& params) {
223: Value& vfile=params.as_no_junction(0, "file name must not be code");
1.113 paf 224: r.use_file(r.main_class, vfile.as_string());
1.1 paf 225: }
226:
1.129 paf 227: static void _for(Request& r, MethodParams& params) {
228: const String& var_name=params.as_string(0, "var name must be string");
229: int from=params.as_int(1, "from must be int", r);
230: int to=params.as_int(2, "to must be int", r);
231: Value& body_code=params.as_junction(3, "body must be code");
232: Value* delim_maybe_code=params.count()>4?¶ms[4]:0;
1.1 paf 233:
1.57 paf 234: if(to-from>=MAX_LOOPS) // too long loop?
1.78 paf 235: throw Exception("parser.runtime",
1.129 paf 236: 0,
1.57 paf 237: "endless loop detected");
238:
1.1 paf 239: bool need_delim=false;
1.129 paf 240: VInt* vint=new VInt(0);
1.117 paf 241: r.get_method_frame()->caller()->put_element(var_name, vint, false);
1.1 paf 242: for(int i=from; i<=to; i++) {
243: vint->set_int(i);
244:
1.108 paf 245: StringOrValue sv_processed=r.process(body_code);
1.129 paf 246: const String* s_processed=sv_processed.get_string();
247: if(delim_maybe_code && s_processed && s_processed->length()) { // delimiter set and we have body
1.108 paf 248: if(need_delim) // need delim & iteration produced string?
1.86 paf 249: r.write_pass_lang(r.process(*delim_maybe_code));
1.1 paf 250: need_delim=true;
251: }
1.108 paf 252: r.write_pass_lang(sv_processed);
1.1 paf 253: }
254: }
255:
1.129 paf 256: static void _eval(Request& r, MethodParams& params) {
257: Value& expr=params.as_junction(0, "need expression");
1.1 paf 258: // evaluate expresion
1.129 paf 259: Value& value_result=r.process_to_value(expr,
1.1 paf 260: true/*don't intercept string*/).as_expr_result();
1.129 paf 261: if(params.count()>1) {
262: Value& fmt=params.as_no_junction(1, "fmt must not be code");
263: r.write_no_lang(String(format(value_result.as_double(), fmt.as_string().cstrm())));
1.91 paf 264: } else
1.129 paf 265: r.write_no_lang(value_result);
1.1 paf 266: }
267:
1.129 paf 268: static void _connect(Request& r, MethodParams& params) {
1.63 paf 269: #ifdef RESOURCES_DEBUG
270: struct timeval mt[2];
271: #endif
1.129 paf 272: Value& url=params.as_no_junction(0, "url must not be code");
273: Value& body_code=params.as_junction(1, "body must be code");
1.1 paf 274:
1.129 paf 275: Table* protocol2driver_and_client=0;
276: if(Value* sql=r.main_class.get_element(String(MAIN_SQL_NAME), r.main_class, false)) {
277: if(Value* element=sql->get_element(String(MAIN_SQL_DRIVERS_NAME), *sql, false)) {
1.113 paf 278: protocol2driver_and_client=element->get_table();
279: }
280: }
1.11 paf 281:
1.63 paf 282: #ifdef RESOURCES_DEBUG
283: //measure:before
284: gettimeofday(&mt[0],NULL);
285: #endif
1.1 paf 286: // connect
1.142 paf 287: SQL_Connection* connection=SQL_driver_manager->get_connection(url.as_string(),
1.144 paf 288: protocol2driver_and_client,
289: r.charsets.source().NAME().cstr());
1.1 paf 290:
1.63 paf 291: #ifdef RESOURCES_DEBUG
292: //measure:after connect
293: gettimeofday(&mt[1],NULL);
294:
295: double t[2];
296: for(int i=0;i<2;i++)
297: t[i]=mt[i].tv_sec+mt[i].tv_usec/1000000.0;
298:
299: r.sql_connect_time+=t[1]-t[0];
300: #endif
1.129 paf 301: Temp_connection temp_connection(r, connection);
1.1 paf 302: // execute body
1.53 parser 303: try {
1.86 paf 304: r.write_assign_lang(r.process(body_code));
1.129 paf 305: connection->commit();
306: connection->close();
1.75 paf 307: } catch(...) { // process problem
1.129 paf 308: connection->rollback();
309: connection->close();
310: rethrow;
1.1 paf 311: }
312: }
313:
1.41 parser 314: #ifndef DOXYGEN
1.129 paf 315: class Switch_data: public PA_Object {
316: public:
317: Request& r;
318: Value& searching;
319: Value* found;
320: Value* _default;
321: public:
322: Switch_data(Request& ar, Value& asearching):
323: r(ar), searching(asearching) {}
1.28 parser 324: };
1.41 parser 325: #endif
1.129 paf 326: static void _switch(Request& r, MethodParams& params) {
327: Switch_data* data=new Switch_data(r, r.process_to_value(params[0]));
1.135 paf 328: Temp_hash_value<const String::Body, void*>
1.129 paf 329: switch_data_setter(r.classes_conf, switch_data_name, data);
1.28 parser 330:
1.129 paf 331: Value& cases_code=params.as_junction(1, "switch cases must be code");
1.82 paf 332: // execution of found ^case[...]{code} must be in context of ^switch[...]{code}
333: // because of stacked WWrapper used there as wcontext
1.84 paf 334: r.process(cases_code, true/*intercept_string*/);
1.129 paf 335: if(Value* selected_code=data->found? data->found: data->_default) {
1.83 paf 336: // setting code context, would execute in ^switch[...]{>>context<<}
1.105 paf 337: //selected_code->get_junction()->change_context(cases_code.get_junction());
1.107 paf 338: r.write_pass_lang(r.process(*selected_code));
1.83 paf 339: }
1.28 parser 340: }
341:
1.129 paf 342: static void _case(Request& r, MethodParams& params) {
343: Switch_data* data=static_cast<Switch_data*>(r.classes_conf.get(switch_data_name));
1.38 parser 344: if(!data)
1.78 paf 345: throw Exception("parser.runtime",
1.129 paf 346: 0,
1.38 parser 347: "without switch");
1.28 parser 348:
1.129 paf 349: int count=params.count();
350: Value& code=params.as_junction(--count, "case result must be code");
1.83 paf 351:
352: // killing context for safety, would execute in ^switch[...]{>>context<<}
353: // reason: context is stacked, and it would become invalid afterwards
1.105 paf 354: //code->get_junction()->change_context(0);
1.83 paf 355:
1.28 parser 356: for(int i=0; i<count; i++) {
1.129 paf 357: Value& value=r.process_to_value(params[i]);
1.28 parser 358:
1.82 paf 359: if(value.as_string() == CASE_DEFAULT_VALUE) {
1.129 paf 360: data->_default=&code;
1.28 parser 361: break;
362: }
363:
364: bool matches;
1.129 paf 365: if(data->searching.is_string())
366: matches=data->searching.as_string() == value.as_string();
1.28 parser 367: else
1.129 paf 368: matches=data->searching.as_double() == value.as_double();
1.28 parser 369:
370: if(matches) {
1.82 paf 371: if(data->found)
372: throw Exception("parser.runtime",
1.129 paf 373: 0,
1.82 paf 374: "duplicate found");
375:
1.129 paf 376: data->found=&code;
1.28 parser 377: break;
378: }
379: }
380: }
1.136 paf 381: #ifndef DOXYGEN
382: struct Try_catch_result {
383: StringOrValue processed_code;
384: const String* exception_should_be_handled;
385:
386: Try_catch_result(): exception_should_be_handled(0) {}
387: };
388: #endif
389:
390: /// used by ^try and ^cache, @returns $exception.handled[string] if any
391: template<class I>
392: static Try_catch_result try_catch(Request& r,
393: StringOrValue body_code(Request&, I), I info,
394: Value* catch_code)
395: {
396: Try_catch_result result;
397: if(!catch_code) {
398: result.processed_code=body_code(r, info);
399: return result;
400: }
401:
402: // taking snapshot of try-context
403: Request_context_saver try_context(r);
404: try {
405: result.processed_code=body_code(r, info);
406: } catch(const Exception& e) {
407: Request_context_saver throw_context(r); // taking snapshot of throw-context [stack trace contains error]
408: Request::Exception_details details=r.get_details(e);
409: try_context.restore(); // restoring try-context to perform catch-code
410:
411: Junction* junction=catch_code->get_junction();
412: Value* method_frame=junction->method_frame;
413: Value* saved_exception_var_value=method_frame->get_element(exception_var_name, *method_frame, false);
414: junction->method_frame->put_element(exception_var_name, &details.vhash, false);
415: result.processed_code=r.process(*catch_code);
416:
417: // retriving $exception.handled, restoring $exception var
418: Value* vhandled=details.vhash.hash().get(exception_handled_part_name);
419: junction->method_frame->put_element(exception_var_name, saved_exception_var_value, false);
420:
421: bool bhandled=false;
422: if(vhandled) {
423: if(vhandled->is_string()) { // not simple $exception.handled(1/0)?
424: result.exception_should_be_handled=vhandled->get_string(); // considering 'recovered' and let the caller recover
425: return result;
426: }
427:
428: bhandled=vhandled->as_bool();
429: }
430:
431: if(!bhandled) {
432: throw_context.restore(); // restoring throw-context [exception were not handled]
433: rethrow;
434: }
435: }
436: return result;
437: }
1.28 parser 438:
1.63 paf 439: // cache--
440:
441: // consts
442:
1.131 paf 443: const int DATA_STRING_SERIALIZED_VERSION=0x0005;
1.63 paf 444:
445: // helper types
446:
447: #ifndef DOXYGEN
448: struct Data_string_serialized_prolog {
449: int version;
1.79 paf 450: time_t expires;
1.63 paf 451: };
452: #endif
453:
1.68 paf 454: void cache_delete(const String& file_spec) {
455: file_delete(file_spec, false/*fail_on_read_problem*/);
1.63 paf 456: }
1.69 paf 457:
458: #ifndef DOXYGEN
1.135 paf 459: struct Cache_scope {
1.129 paf 460: public:
1.79 paf 461: time_t expires;
1.135 paf 462: const String* body_from_disk;
1.79 paf 463: };
1.69 paf 464: struct Locked_process_and_cache_put_action_info {
465: Request *r;
1.136 paf 466: Cache_scope *scope;
467: Value* body_code; Value* catch_code;
468: const String* processed_code;
1.69 paf 469: };
470: #endif
1.136 paf 471:
472:
473:
474: static StringOrValue process_cache_body_code(Request& r, Value* body_code) {
475: return StringOrValue(&r.process_to_string(*body_code), 0);
476: }
477:
1.129 paf 478: /* @todo maybe network order worth spending some effort?
479: don't bothering myself with network byte order,
480: am not planning to be able to move resulting file across platforms
481: */
1.69 paf 482: static void locked_process_and_cache_put_action(int f, void *context) {
483: Locked_process_and_cache_put_action_info& info=
484: *static_cast<Locked_process_and_cache_put_action_info *>(context);
1.129 paf 485:
1.69 paf 486: // body->process
1.136 paf 487: Try_catch_result result=try_catch(*info.r,
488: process_cache_body_code, info.body_code,
489: info.catch_code);
490:
491: if(result.exception_should_be_handled) {
492: if(*result.exception_should_be_handled==CACHE_EXCEPTION_HANDLED_CACHE_NAME) {
493: if(const String* body_from_disk=info.scope->body_from_disk) // we have something old?
494: info.processed_code=body_from_disk;
495: else
496: throw Exception(0,
497: new String("$"EXCEPTION_VAR_NAME"."EXCEPTION_HANDLED_PART_NAME"["CACHE_EXCEPTION_HANDLED_CACHE_NAME"]"),
498: "fallback failed - there is no old cached body");
499: } else
500: throw Exception("parser.runtime",
501: result.exception_should_be_handled,
502: "$"EXCEPTION_VAR_NAME"."EXCEPTION_HANDLED_PART_NAME" value must be "
503: "either boolean or string '"CACHE_EXCEPTION_HANDLED_CACHE_NAME"'");
504: } else
505: info.processed_code=&result.processed_code.as_string();
1.69 paf 506:
1.79 paf 507: // expiration time not spoiled by ^cache(0) or something?
1.136 paf 508: if(info.scope->expires > time(0)) {
1.79 paf 509: // string -serialize> buffer
1.136 paf 510: String::Cm serialized=info.processed_code->serialize(
1.129 paf 511: sizeof(Data_string_serialized_prolog));
1.79 paf 512: Data_string_serialized_prolog& prolog=
1.129 paf 513: *reinterpret_cast<Data_string_serialized_prolog *>(serialized.str);
1.79 paf 514: prolog.version=DATA_STRING_SERIALIZED_VERSION;
1.136 paf 515: prolog.expires=info.scope->expires;
1.79 paf 516:
517: // buffer -write> file
1.129 paf 518: write(f, serialized.str, serialized.length);
1.79 paf 519: } else // expired!
1.136 paf 520: info.scope->expires=0; // flag it so that could be easily checked by caller
1.69 paf 521: }
1.129 paf 522: const String* locked_process_and_cache_put(Request& r,
1.128 paf 523: Value& body_code,
1.136 paf 524: Value* catch_code,
525: Cache_scope& scope,
526: const String& file_spec)
527: {
1.140 paf 528: Locked_process_and_cache_put_action_info info={&r, &scope, &body_code, catch_code, 0};
1.69 paf 529:
1.129 paf 530: const String* result=file_write_action_under_lock(
1.69 paf 531: file_spec,
532: "cache_put", locked_process_and_cache_put_action, &info,
533: false/*as_text*/,
534: false/*do_append*/,
1.96 paf 535: false/*block*/,
1.136 paf 536: false/*fail on lock problem*/) ? info.processed_code: 0;
1.100 paf 537: time_t now=time(0);
1.136 paf 538: if(scope.expires<=now)
1.79 paf 539: cache_delete(file_spec);
540: return result;
1.63 paf 541: }
1.137 paf 542: #ifndef DOXYGEN
1.135 paf 543: struct Cache_get_result {
544: const String* body;
545: bool expired;
1.137 paf 546: };
547: #endif
548: static Cache_get_result cache_get(Request_charsets& charsets, const String& file_spec, time_t now) {
1.140 paf 549: Cache_get_result result={0, false};
1.135 paf 550:
1.129 paf 551: File_read_result file=file_read(charsets, file_spec,
1.63 paf 552: false/*as_text*/,
1.129 paf 553: 0, //no params
554: false/*fail_on_read_problem*/);
555: if(file.success && file.length/* ignore reads which are empty due to
1.72 paf 556: non-unary open+lockEX conflict with lockSH */) {
1.129 paf 557:
1.72 paf 558: Data_string_serialized_prolog& prolog=
1.129 paf 559: *reinterpret_cast<Data_string_serialized_prolog *>(file.str);
1.63 paf 560:
1.135 paf 561: String* body=new String;
1.72 paf 562: if(
1.129 paf 563: file.length>=sizeof(Data_string_serialized_prolog)
1.135 paf 564: && prolog.version==DATA_STRING_SERIALIZED_VERSION) {
565: if(body->deserialize(sizeof(Data_string_serialized_prolog), file.str, file.length)) {
566: result.body=body;
567: result.expired=prolog.expires <= now;
568: }
569: }
1.72 paf 570: }
1.63 paf 571:
1.135 paf 572: return result;
1.63 paf 573: }
1.129 paf 574: static time_t as_expires(Request& r, MethodParams& params,
1.79 paf 575: int index, time_t now) {
576: time_t result;
1.129 paf 577: if(Value* vdate=params[index].as(VDATE_TYPE, false))
578: result=static_cast<VDate*>(vdate)->get_time();
1.79 paf 579: else
1.129 paf 580: result=now+(time_t)params.as_double(index, "lifespan must be date or number", r);
1.79 paf 581:
582: return result;
583: }
1.129 paf 584: static const String& as_file_spec(Request& r, MethodParams& params, int index) {
585: return r.absolute(params.as_string(index, "filespec must be string"));
1.79 paf 586: }
1.129 paf 587: static void _cache(Request& r, MethodParams& params) {
1.79 paf 588: time_t now=time(0);
589:
590: // ^cache[filename] ^cache(seconds) ^cache[expires date]
1.129 paf 591: if(params.count()==1) {
592: if(params[0].is_string()) { // filename?
1.79 paf 593: cache_delete(as_file_spec(r, params, 0));
594: return;
595: }
596:
597: // secods|expires date
1.135 paf 598: Cache_scope* scope=static_cast<Cache_scope*>(r.classes_conf.get(cache_data_name));
599: if(!scope)
1.79 paf 600: throw Exception("parser.runtime",
1.129 paf 601: 0,
1.79 paf 602: "expire-time reducing instruction without cache");
603:
1.129 paf 604: time_t expires=as_expires(r, params, 0, now);
1.135 paf 605: if(expires < scope->expires)
606: scope->expires=expires;
1.79 paf 607:
608: return;
609: }
1.63 paf 610:
611: // file_spec, expires, body code
1.129 paf 612: const String& file_spec=r.absolute(params.as_string(0, "filespec must be string"));
1.65 paf 613:
1.141 paf 614: Cache_scope scope={as_expires(r, params, 1, now), 0};
1.135 paf 615:
616: Temp_hash_value<const String::Body, void*>
617: cache_scope_setter(r.classes_conf, cache_data_name, &scope);
1.136 paf 618: Value& body_code=params.as_junction(2, "body_code must be code");
619: Value* catch_code=0;
620: if(params.count()>3)
621: catch_code=¶ms.as_junction(3, "catch_code must be code");
1.63 paf 622:
1.135 paf 623: if(scope.expires>now) { // valid 'expires' specified? try cached copy...
1.69 paf 624: // hence we don't hope to have unary create/lockEX
625: // we need some plan to live in a life like that, so...
626: // worst races plan:
627: // A B
628: // open
629: // |open
630: // lockSH
631: // |nonblocking-lockEX fails
632: // unlockSH
633: // close, cache_get returns 0
634: // open
635: // nonblocking-lockEX succeeds; process, write, close
636: // |retry1: open
637: // ...
638: // |lockSH succeeds; ...
639:
640: for(int retry=0; retry<2; retry++) {
1.135 paf 641: Cache_get_result cached=cache_get(r.charsets, file_spec, now);
1.136 paf 642: if(cached.body) { // have cached copy
1.135 paf 643: if(cached.expired)
644: scope.body_from_disk=cached.body; // storing for user to retrive it with ^cache[]
1.136 paf 645: else // and it's not expired yet
646: {
1.135 paf 647: // write it out
648: r.write_assign_lang(*cached.body);
649: // happy with it
650: return;
651: }
1.79 paf 652: }
1.69 paf 653:
1.135 paf 654: // non-blocked lock; process; cache it
655: if(const String* processed_body=
1.136 paf 656: locked_process_and_cache_put(r, body_code, catch_code, scope, file_spec)) {
1.135 paf 657: // write it out
658: r.write_assign_lang(*processed_body);
659: // happy with it
660: return;
661: } else { // somebody writing result right now
662: pa_sleep(0, 500000); // waiting half a second
663: retry=0; // prolonging our wait, than could cache_get it, without processing body_code
664: }
1.69 paf 665: }
1.78 paf 666: throw Exception(0,
1.69 paf 667: &file_spec,
668: "locking problem");
669: } else {
1.79 paf 670: // instructed not to cache; forget cached copy
1.68 paf 671: cache_delete(file_spec);
1.69 paf 672: // process
1.81 paf 673: const String& processed_body=r.process_to_string(body_code);
1.69 paf 674: // write it out
675: r.write_assign_lang(processed_body);
676: // happy with it
677: return;
678: }
679: // never reached
1.63 paf 680: }
681:
1.136 paf 682: static StringOrValue process_try_body_code(Request& r, Value* body_code) {
683: return r.process(*body_code);
684: }
1.129 paf 685: static void _try_operator(Request& r, MethodParams& params) {
686: Value& body_code=params.as_junction(0, "body_code must be code");
687: Value& catch_code=params.as_junction(1, "catch_code must be code");
1.74 paf 688:
1.136 paf 689: Try_catch_result result=try_catch(r,
690: process_try_body_code, &body_code,
691: &catch_code);
692:
693: if(result.exception_should_be_handled)
694: throw Exception("parser.runtime",
695: result.exception_should_be_handled,
696: "catch block must set $exception.handled to some boolean value, not string");
1.123 paf 697:
1.136 paf 698: // write out processed body_code or catch_code
699: r.write_pass_lang(result.processed_code);
1.74 paf 700: }
701:
1.138 paf 702: static void _throw_operator(Request&, MethodParams& params) {
1.129 paf 703: if(params.count()==1) {
704: if(HashStringValue *hash=params[0].get_hash()) {
705: const char* type=0;
706: if(Value* value=hash->get(exception_type_part_name))
1.78 paf 707: type=value->as_string().cstr();
1.129 paf 708: const String* source=0;
709: if(Value* value=hash->get(exception_source_part_name))
1.74 paf 710: source=&value->as_string();
1.138 paf 711: const char* comment=0;
1.129 paf 712: if(Value* value=hash->get(exception_comment_part_name))
1.74 paf 713: comment=value->as_string().cstr();
714:
1.78 paf 715: throw Exception(type,
1.129 paf 716: source?source:0,
717: "%s", comment?comment:"");
1.74 paf 718: } else
1.78 paf 719: throw Exception("parser.runtime",
1.129 paf 720: 0,
1.74 paf 721: "one-param version has hash param");
722: } else {
1.129 paf 723: const char* type=params.as_string(0, "type must be string").cstr();
724: const String& source=params.as_string(1, "source must be string");
725: const char* comment=params.count()>2? params.as_string(2, "comment must be string").cstr()
726: :0;
1.97 paf 727: throw Exception(type, &source, "%s", comment?comment:"");
1.74 paf 728: }
1.132 paf 729: }
1.129 paf 730:
731: #if defined(WIN32) && defined(_DEBUG)
732: # define PA_BPT
1.138 paf 733: static void _bpt(Request&, MethodParams&) {
1.129 paf 734: _asm int 3;
735: }
736: #endif
737:
1.10 paf 738: // constructor
739:
1.129 paf 740: VClassMAIN::VClassMAIN(): VClass() {
741: set_name(*new String(MAIN_CLASS_NAME));
742:
743: #ifdef PA_BPT
744: // ^bpt[]
745: add_native_method("bpt", Method::CT_ANY, _bpt, 0, 0);
746: #endif
1.121 paf 747:
1.1 paf 748: // ^if(condition){code-when-true}
749: // ^if(condition){code-when-true}{code-when-false}
1.10 paf 750: add_native_method("if", Method::CT_ANY, _if, 2, 3);
1.1 paf 751:
752: // ^untaint[as-is|uri|sql|js|html|html-typo]{code}
1.59 paf 753: add_native_method("untaint", Method::CT_ANY, _untaint, 1, 2);
1.1 paf 754:
755: // ^taint[as-is|uri|sql|js|html|html-typo]{code}
1.10 paf 756: add_native_method("taint", Method::CT_ANY, _taint, 1, 2);
1.1 paf 757:
758: // ^process[code]
1.116 paf 759: add_native_method("process", Method::CT_ANY, _process, 1, 2);
1.1 paf 760:
761: // ^rem{code}
1.51 parser 762: add_native_method("rem", Method::CT_ANY, _rem, 1, 10000);
1.1 paf 763:
764: // ^while(condition){code}
1.10 paf 765: add_native_method("while", Method::CT_ANY, _while, 2, 2);
1.1 paf 766:
767: // ^use[file]
1.10 paf 768: add_native_method("use", Method::CT_ANY, _use, 1, 1);
1.1 paf 769:
1.54 paf 770: // ^for[i](from-number;to-number-inclusive){code}[delim]
1.10 paf 771: add_native_method("for", Method::CT_ANY, _for, 3+1, 3+1+1);
1.1 paf 772:
773: // ^eval(expr)
774: // ^eval(expr)[format]
1.10 paf 775: add_native_method("eval", Method::CT_ANY, _eval, 1, 2);
1.52 parser 776:
1.1 paf 777: // ^connect[protocol://user:pass@host[:port]/database]{code with ^sql-s}
1.10 paf 778: add_native_method("connect", Method::CT_ANY, _connect, 2, 2);
779:
1.63 paf 780:
1.136 paf 781: // ^cache[file_spec](time){code}[{catch code}] time=0 no cache
1.65 paf 782: // ^cache[file_spec] delete cache
1.136 paf 783: add_native_method("cache", Method::CT_ANY, _cache, 1, 4);
1.63 paf 784:
1.28 parser 785: // switch
786:
787: // ^switch[value]{cases}
788: add_native_method("switch", Method::CT_ANY, _switch, 2, 2);
789:
790: // ^case[value]{code}
1.51 parser 791: add_native_method("case", Method::CT_ANY, _case, 2, 10000);
1.74 paf 792:
793: // try-catch
794:
795: // ^try{code}{catch code}
796: add_native_method("try", Method::CT_ANY, _try_operator, 2, 2);
797: // ^throw[$exception hash]
798: // ^throw[type;source;comment]
799: add_native_method("throw", Method::CT_ANY, _throw_operator, 1, 3);
800:
1.10 paf 801: }
1.11 paf 802:
803: // constructor & configurator
1.1 paf 804:
1.129 paf 805: VStateless_class& VClassMAIN_create() {
806: return *new VClassMAIN;
1.1 paf 807: }
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