Annotation of parser3/src/classes/op.C, revision 1.139
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:
1.139 ! paf 8: static const char * const IDENT_OP_C="$Date: 2003/11/20 15:35:29 $";
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"
1.1 paf 21:
1.18 parser 22: // limits
23:
24: #define MAX_LOOPS 10000
25:
1.10 paf 26: // defines
27:
1.82 paf 28: #define CASE_DEFAULT_VALUE "DEFAULT"
1.11 paf 29:
1.10 paf 30: // class
31:
1.113 paf 32: class VClassMAIN: public VClass {
1.10 paf 33: public:
1.129 paf 34: VClassMAIN();
1.10 paf 35: };
36:
1.129 paf 37: // defines for statics
38:
39: #define SWITCH_DATA_NAME "SWITCH-DATA"
40: #define CACHE_DATA_NAME "CACHE-DATA"
41: #define EXCEPTION_VAR_NAME "exception"
42:
43: // statics
44:
45: //^switch ^case
46: static const String switch_data_name(SWITCH_DATA_NAME);
47: //^cache
48: static const String cache_data_name(CACHE_DATA_NAME);
49:
50: static const String exception_var_name(EXCEPTION_VAR_NAME);
51:
1.136 paf 52: // local defines
53:
54: #define CACHE_EXCEPTION_HANDLED_CACHE_NAME "cache"
55:
1.129 paf 56: // helpers
57:
1.130 paf 58: class Untaint_lang_name2enum: public Hash<const String::Body, String::Language> {
1.129 paf 59: public:
60: Untaint_lang_name2enum() {
61: #define ULN(name, LANG) \
1.130 paf 62: put(String::Body(name), (value_type)(String::L_##LANG));
1.129 paf 63: ULN("as-is", AS_IS);
64: ULN("optimized-as-is", AS_IS|String::L_OPTIMIZE_BIT);
65: ULN("file-spec", FILE_SPEC);
66: ULN("http-header", HTTP_HEADER);
67: ULN("mail-header", MAIL_HEADER);
68: ULN("uri", URI);
69: ULN("table", TABLE);
70: ULN("sql", SQL);
71: ULN("js", JS);
72: ULN("xml", XML);
73: ULN("optimized-xml", XML|String::L_OPTIMIZE_BIT);
74: ULN("html", HTML);
75: ULN("optimized-html", HTML|String::L_OPTIMIZE_BIT);
76: #undef ULN
77: }
78: } untaint_lang_name2enum;
79:
1.10 paf 80: // methods
81:
1.129 paf 82: static void _if(Request& r, MethodParams& params) {
83: Value& condition_code=params.as_junction(0, "condition must be expression");
1.1 paf 84:
1.81 paf 85: bool condition=r.process_to_value(condition_code,
1.83 paf 86: /*0/*no name* /,*/
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,
1.83 paf 213: /*0/*no name* /,*/
1.1 paf 214: false/*don't intercept string*/).as_bool();
215: if(!condition) // ...condition is true
216: break;
217:
218: // write processed body
1.86 paf 219: r.write_pass_lang(r.process(body));
1.1 paf 220: }
221: }
222:
1.129 paf 223: static void _use(Request& r, MethodParams& params) {
224: Value& vfile=params.as_no_junction(0, "file name must not be code");
1.113 paf 225: r.use_file(r.main_class, vfile.as_string());
1.1 paf 226: }
227:
1.129 paf 228: static void _for(Request& r, MethodParams& params) {
229: const String& var_name=params.as_string(0, "var name must be string");
230: int from=params.as_int(1, "from must be int", r);
231: int to=params.as_int(2, "to must be int", r);
232: Value& body_code=params.as_junction(3, "body must be code");
233: Value* delim_maybe_code=params.count()>4?¶ms[4]:0;
1.1 paf 234:
1.57 paf 235: if(to-from>=MAX_LOOPS) // too long loop?
1.78 paf 236: throw Exception("parser.runtime",
1.129 paf 237: 0,
1.57 paf 238: "endless loop detected");
239:
1.1 paf 240: bool need_delim=false;
1.129 paf 241: VInt* vint=new VInt(0);
1.117 paf 242: r.get_method_frame()->caller()->put_element(var_name, vint, false);
1.1 paf 243: for(int i=from; i<=to; i++) {
244: vint->set_int(i);
245:
1.108 paf 246: StringOrValue sv_processed=r.process(body_code);
1.129 paf 247: const String* s_processed=sv_processed.get_string();
248: if(delim_maybe_code && s_processed && s_processed->length()) { // delimiter set and we have body
1.108 paf 249: if(need_delim) // need delim & iteration produced string?
1.86 paf 250: r.write_pass_lang(r.process(*delim_maybe_code));
1.1 paf 251: need_delim=true;
252: }
1.108 paf 253: r.write_pass_lang(sv_processed);
1.1 paf 254: }
255: }
256:
1.129 paf 257: static void _eval(Request& r, MethodParams& params) {
258: Value& expr=params.as_junction(0, "need expression");
1.1 paf 259: // evaluate expresion
1.129 paf 260: Value& value_result=r.process_to_value(expr,
1.83 paf 261: /*0/*no name YET* /,*/
1.1 paf 262: true/*don't intercept string*/).as_expr_result();
1.129 paf 263: if(params.count()>1) {
264: Value& fmt=params.as_no_junction(1, "fmt must not be code");
265: r.write_no_lang(String(format(value_result.as_double(), fmt.as_string().cstrm())));
1.91 paf 266: } else
1.129 paf 267: r.write_no_lang(value_result);
1.1 paf 268: }
269:
1.129 paf 270: static void _connect(Request& r, MethodParams& params) {
1.63 paf 271: #ifdef RESOURCES_DEBUG
272: struct timeval mt[2];
273: #endif
1.129 paf 274: Value& url=params.as_no_junction(0, "url must not be code");
275: Value& body_code=params.as_junction(1, "body must be code");
1.1 paf 276:
1.129 paf 277: Table* protocol2driver_and_client=0;
278: if(Value* sql=r.main_class.get_element(String(MAIN_SQL_NAME), r.main_class, false)) {
279: if(Value* element=sql->get_element(String(MAIN_SQL_DRIVERS_NAME), *sql, false)) {
1.113 paf 280: protocol2driver_and_client=element->get_table();
281: }
282: }
1.11 paf 283:
1.63 paf 284: #ifdef RESOURCES_DEBUG
285: //measure:before
286: gettimeofday(&mt[0],NULL);
287: #endif
1.1 paf 288: // connect
1.129 paf 289: SQL_Connection* connection=SQL_driver_manager.get_connection(url.as_string(),
290: protocol2driver_and_client);
1.1 paf 291:
1.63 paf 292: #ifdef RESOURCES_DEBUG
293: //measure:after connect
294: gettimeofday(&mt[1],NULL);
295:
296: double t[2];
297: for(int i=0;i<2;i++)
298: t[i]=mt[i].tv_sec+mt[i].tv_usec/1000000.0;
299:
300: r.sql_connect_time+=t[1]-t[0];
301: #endif
1.129 paf 302: Temp_connection temp_connection(r, connection);
1.1 paf 303: // execute body
1.53 parser 304: try {
1.86 paf 305: r.write_assign_lang(r.process(body_code));
1.129 paf 306: connection->commit();
307: connection->close();
1.75 paf 308: } catch(...) { // process problem
1.129 paf 309: connection->rollback();
310: connection->close();
311: rethrow;
1.1 paf 312: }
313: }
314:
1.41 parser 315: #ifndef DOXYGEN
1.129 paf 316: class Switch_data: public PA_Object {
317: public:
318: Request& r;
319: Value& searching;
320: Value* found;
321: Value* _default;
322: public:
323: Switch_data(Request& ar, Value& asearching):
324: r(ar), searching(asearching) {}
1.28 parser 325: };
1.41 parser 326: #endif
1.129 paf 327: static void _switch(Request& r, MethodParams& params) {
328: Switch_data* data=new Switch_data(r, r.process_to_value(params[0]));
1.135 paf 329: Temp_hash_value<const String::Body, void*>
1.129 paf 330: switch_data_setter(r.classes_conf, switch_data_name, data);
1.28 parser 331:
1.129 paf 332: Value& cases_code=params.as_junction(1, "switch cases must be code");
1.82 paf 333: // execution of found ^case[...]{code} must be in context of ^switch[...]{code}
334: // because of stacked WWrapper used there as wcontext
1.84 paf 335: r.process(cases_code, true/*intercept_string*/);
1.129 paf 336: if(Value* selected_code=data->found? data->found: data->_default) {
1.83 paf 337: // setting code context, would execute in ^switch[...]{>>context<<}
1.105 paf 338: //selected_code->get_junction()->change_context(cases_code.get_junction());
1.107 paf 339: r.write_pass_lang(r.process(*selected_code));
1.83 paf 340: }
1.28 parser 341: }
342:
1.129 paf 343: static void _case(Request& r, MethodParams& params) {
344: Switch_data* data=static_cast<Switch_data*>(r.classes_conf.get(switch_data_name));
1.38 parser 345: if(!data)
1.78 paf 346: throw Exception("parser.runtime",
1.129 paf 347: 0,
1.38 parser 348: "without switch");
1.28 parser 349:
1.129 paf 350: int count=params.count();
351: Value& code=params.as_junction(--count, "case result must be code");
1.83 paf 352:
353: // killing context for safety, would execute in ^switch[...]{>>context<<}
354: // reason: context is stacked, and it would become invalid afterwards
1.105 paf 355: //code->get_junction()->change_context(0);
1.83 paf 356:
1.28 parser 357: for(int i=0; i<count; i++) {
1.129 paf 358: Value& value=r.process_to_value(params[i]);
1.28 parser 359:
1.82 paf 360: if(value.as_string() == CASE_DEFAULT_VALUE) {
1.129 paf 361: data->_default=&code;
1.28 parser 362: break;
363: }
364:
365: bool matches;
1.129 paf 366: if(data->searching.is_string())
367: matches=data->searching.as_string() == value.as_string();
1.28 parser 368: else
1.129 paf 369: matches=data->searching.as_double() == value.as_double();
1.28 parser 370:
371: if(matches) {
1.82 paf 372: if(data->found)
373: throw Exception("parser.runtime",
1.129 paf 374: 0,
1.82 paf 375: "duplicate found");
376:
1.129 paf 377: data->found=&code;
1.28 parser 378: break;
379: }
380: }
381: }
1.136 paf 382: #ifndef DOXYGEN
383: struct Try_catch_result {
384: StringOrValue processed_code;
385: const String* exception_should_be_handled;
386:
387: Try_catch_result(): exception_should_be_handled(0) {}
388: };
389: #endif
390:
391: /// used by ^try and ^cache, @returns $exception.handled[string] if any
392: template<class I>
393: static Try_catch_result try_catch(Request& r,
394: StringOrValue body_code(Request&, I), I info,
395: Value* catch_code)
396: {
397: Try_catch_result result;
398: if(!catch_code) {
399: result.processed_code=body_code(r, info);
400: return result;
401: }
402:
403: // taking snapshot of try-context
404: Request_context_saver try_context(r);
405: try {
406: result.processed_code=body_code(r, info);
407: } catch(const Exception& e) {
408: Request_context_saver throw_context(r); // taking snapshot of throw-context [stack trace contains error]
409: Request::Exception_details details=r.get_details(e);
410: try_context.restore(); // restoring try-context to perform catch-code
411:
412: Junction* junction=catch_code->get_junction();
413: Value* method_frame=junction->method_frame;
414: Value* saved_exception_var_value=method_frame->get_element(exception_var_name, *method_frame, false);
415: junction->method_frame->put_element(exception_var_name, &details.vhash, false);
416: result.processed_code=r.process(*catch_code);
417:
418: // retriving $exception.handled, restoring $exception var
419: Value* vhandled=details.vhash.hash().get(exception_handled_part_name);
420: junction->method_frame->put_element(exception_var_name, saved_exception_var_value, false);
421:
422: bool bhandled=false;
423: if(vhandled) {
424: if(vhandled->is_string()) { // not simple $exception.handled(1/0)?
425: result.exception_should_be_handled=vhandled->get_string(); // considering 'recovered' and let the caller recover
426: return result;
427: }
428:
429: bhandled=vhandled->as_bool();
430: }
431:
432: if(!bhandled) {
433: throw_context.restore(); // restoring throw-context [exception were not handled]
434: rethrow;
435: }
436: }
437: return result;
438: }
1.28 parser 439:
1.63 paf 440: // cache--
441:
442: // consts
443:
1.131 paf 444: const int DATA_STRING_SERIALIZED_VERSION=0x0005;
1.63 paf 445:
446: // helper types
447:
448: #ifndef DOXYGEN
449: struct Data_string_serialized_prolog {
450: int version;
1.79 paf 451: time_t expires;
1.63 paf 452: };
453: #endif
454:
1.68 paf 455: void cache_delete(const String& file_spec) {
456: file_delete(file_spec, false/*fail_on_read_problem*/);
1.63 paf 457: }
1.69 paf 458:
459: #ifndef DOXYGEN
1.135 paf 460: struct Cache_scope {
1.129 paf 461: public:
1.79 paf 462: time_t expires;
1.135 paf 463: const String* body_from_disk;
1.79 paf 464: };
1.69 paf 465: struct Locked_process_and_cache_put_action_info {
466: Request *r;
1.136 paf 467: Cache_scope *scope;
468: Value* body_code; Value* catch_code;
469: const String* processed_code;
1.69 paf 470: };
471: #endif
1.136 paf 472:
473:
474:
475: static StringOrValue process_cache_body_code(Request& r, Value* body_code) {
476: return StringOrValue(&r.process_to_string(*body_code), 0);
477: }
478:
1.129 paf 479: /* @todo maybe network order worth spending some effort?
480: don't bothering myself with network byte order,
481: am not planning to be able to move resulting file across platforms
482: */
1.69 paf 483: static void locked_process_and_cache_put_action(int f, void *context) {
484: Locked_process_and_cache_put_action_info& info=
485: *static_cast<Locked_process_and_cache_put_action_info *>(context);
1.129 paf 486:
1.69 paf 487: // body->process
1.136 paf 488: Try_catch_result result=try_catch(*info.r,
489: process_cache_body_code, info.body_code,
490: info.catch_code);
491:
492: if(result.exception_should_be_handled) {
493: if(*result.exception_should_be_handled==CACHE_EXCEPTION_HANDLED_CACHE_NAME) {
494: if(const String* body_from_disk=info.scope->body_from_disk) // we have something old?
495: info.processed_code=body_from_disk;
496: else
497: throw Exception(0,
498: new String("$"EXCEPTION_VAR_NAME"."EXCEPTION_HANDLED_PART_NAME"["CACHE_EXCEPTION_HANDLED_CACHE_NAME"]"),
499: "fallback failed - there is no old cached body");
500: } else
501: throw Exception("parser.runtime",
502: result.exception_should_be_handled,
503: "$"EXCEPTION_VAR_NAME"."EXCEPTION_HANDLED_PART_NAME" value must be "
504: "either boolean or string '"CACHE_EXCEPTION_HANDLED_CACHE_NAME"'");
505: } else
506: info.processed_code=&result.processed_code.as_string();
1.69 paf 507:
1.79 paf 508: // expiration time not spoiled by ^cache(0) or something?
1.136 paf 509: if(info.scope->expires > time(0)) {
1.79 paf 510: // string -serialize> buffer
1.136 paf 511: String::Cm serialized=info.processed_code->serialize(
1.129 paf 512: sizeof(Data_string_serialized_prolog));
1.79 paf 513: Data_string_serialized_prolog& prolog=
1.129 paf 514: *reinterpret_cast<Data_string_serialized_prolog *>(serialized.str);
1.79 paf 515: prolog.version=DATA_STRING_SERIALIZED_VERSION;
1.136 paf 516: prolog.expires=info.scope->expires;
1.79 paf 517:
518: // buffer -write> file
1.129 paf 519: write(f, serialized.str, serialized.length);
1.79 paf 520: } else // expired!
1.136 paf 521: info.scope->expires=0; // flag it so that could be easily checked by caller
1.69 paf 522: }
1.129 paf 523: const String* locked_process_and_cache_put(Request& r,
1.128 paf 524: Value& body_code,
1.136 paf 525: Value* catch_code,
526: Cache_scope& scope,
527: const String& file_spec)
528: {
529: Locked_process_and_cache_put_action_info info={&r, &scope, &body_code, catch_code};
1.69 paf 530:
1.129 paf 531: const String* result=file_write_action_under_lock(
1.69 paf 532: file_spec,
533: "cache_put", locked_process_and_cache_put_action, &info,
534: false/*as_text*/,
535: false/*do_append*/,
1.96 paf 536: false/*block*/,
1.136 paf 537: false/*fail on lock problem*/) ? info.processed_code: 0;
1.100 paf 538: time_t now=time(0);
1.136 paf 539: if(scope.expires<=now)
1.79 paf 540: cache_delete(file_spec);
541: return result;
1.63 paf 542: }
1.137 paf 543: #ifndef DOXYGEN
1.135 paf 544: struct Cache_get_result {
545: const String* body;
546: bool expired;
1.137 paf 547: };
548: #endif
549: static Cache_get_result cache_get(Request_charsets& charsets, const String& file_spec, time_t now) {
1.135 paf 550: Cache_get_result result={0};
551:
1.129 paf 552: File_read_result file=file_read(charsets, file_spec,
1.63 paf 553: false/*as_text*/,
1.129 paf 554: 0, //no params
555: false/*fail_on_read_problem*/);
556: if(file.success && file.length/* ignore reads which are empty due to
1.72 paf 557: non-unary open+lockEX conflict with lockSH */) {
1.129 paf 558:
1.72 paf 559: Data_string_serialized_prolog& prolog=
1.129 paf 560: *reinterpret_cast<Data_string_serialized_prolog *>(file.str);
1.63 paf 561:
1.135 paf 562: String* body=new String;
1.72 paf 563: if(
1.129 paf 564: file.length>=sizeof(Data_string_serialized_prolog)
1.135 paf 565: && prolog.version==DATA_STRING_SERIALIZED_VERSION) {
566: if(body->deserialize(sizeof(Data_string_serialized_prolog), file.str, file.length)) {
567: result.body=body;
568: result.expired=prolog.expires <= now;
569: }
570: }
1.72 paf 571: }
1.63 paf 572:
1.135 paf 573: return result;
1.63 paf 574: }
1.129 paf 575: static time_t as_expires(Request& r, MethodParams& params,
1.79 paf 576: int index, time_t now) {
577: time_t result;
1.129 paf 578: if(Value* vdate=params[index].as(VDATE_TYPE, false))
579: result=static_cast<VDate*>(vdate)->get_time();
1.79 paf 580: else
1.129 paf 581: result=now+(time_t)params.as_double(index, "lifespan must be date or number", r);
1.79 paf 582:
583: return result;
584: }
1.129 paf 585: static const String& as_file_spec(Request& r, MethodParams& params, int index) {
586: return r.absolute(params.as_string(index, "filespec must be string"));
1.79 paf 587: }
1.129 paf 588: static void _cache(Request& r, MethodParams& params) {
1.79 paf 589: time_t now=time(0);
590:
591: // ^cache[filename] ^cache(seconds) ^cache[expires date]
1.129 paf 592: if(params.count()==1) {
593: if(params[0].is_string()) { // filename?
1.79 paf 594: cache_delete(as_file_spec(r, params, 0));
595: return;
596: }
597:
598: // secods|expires date
1.135 paf 599: Cache_scope* scope=static_cast<Cache_scope*>(r.classes_conf.get(cache_data_name));
600: if(!scope)
1.79 paf 601: throw Exception("parser.runtime",
1.129 paf 602: 0,
1.79 paf 603: "expire-time reducing instruction without cache");
604:
1.129 paf 605: time_t expires=as_expires(r, params, 0, now);
1.135 paf 606: if(expires < scope->expires)
607: scope->expires=expires;
1.79 paf 608:
609: return;
610: }
1.63 paf 611:
612: // file_spec, expires, body code
1.129 paf 613: const String& file_spec=r.absolute(params.as_string(0, "filespec must be string"));
1.65 paf 614:
1.135 paf 615: Cache_scope scope={as_expires(r, params, 1, now)};
616:
617: Temp_hash_value<const String::Body, void*>
618: cache_scope_setter(r.classes_conf, cache_data_name, &scope);
1.136 paf 619: Value& body_code=params.as_junction(2, "body_code must be code");
620: Value* catch_code=0;
621: if(params.count()>3)
622: catch_code=¶ms.as_junction(3, "catch_code must be code");
1.63 paf 623:
1.135 paf 624: if(scope.expires>now) { // valid 'expires' specified? try cached copy...
1.69 paf 625: // hence we don't hope to have unary create/lockEX
626: // we need some plan to live in a life like that, so...
627: // worst races plan:
628: // A B
629: // open
630: // |open
631: // lockSH
632: // |nonblocking-lockEX fails
633: // unlockSH
634: // close, cache_get returns 0
635: // open
636: // nonblocking-lockEX succeeds; process, write, close
637: // |retry1: open
638: // ...
639: // |lockSH succeeds; ...
640:
641: for(int retry=0; retry<2; retry++) {
1.135 paf 642: Cache_get_result cached=cache_get(r.charsets, file_spec, now);
1.136 paf 643: if(cached.body) { // have cached copy
1.135 paf 644: if(cached.expired)
645: scope.body_from_disk=cached.body; // storing for user to retrive it with ^cache[]
1.136 paf 646: else // and it's not expired yet
647: {
1.135 paf 648: // write it out
649: r.write_assign_lang(*cached.body);
650: // happy with it
651: return;
652: }
1.79 paf 653: }
1.69 paf 654:
1.135 paf 655: // non-blocked lock; process; cache it
656: if(const String* processed_body=
1.136 paf 657: locked_process_and_cache_put(r, body_code, catch_code, scope, file_spec)) {
1.135 paf 658: // write it out
659: r.write_assign_lang(*processed_body);
660: // happy with it
661: return;
662: } else { // somebody writing result right now
663: pa_sleep(0, 500000); // waiting half a second
664: retry=0; // prolonging our wait, than could cache_get it, without processing body_code
665: }
1.69 paf 666: }
1.78 paf 667: throw Exception(0,
1.69 paf 668: &file_spec,
669: "locking problem");
670: } else {
1.79 paf 671: // instructed not to cache; forget cached copy
1.68 paf 672: cache_delete(file_spec);
1.69 paf 673: // process
1.81 paf 674: const String& processed_body=r.process_to_string(body_code);
1.69 paf 675: // write it out
676: r.write_assign_lang(processed_body);
677: // happy with it
678: return;
679: }
680: // never reached
1.63 paf 681: }
682:
1.136 paf 683: static StringOrValue process_try_body_code(Request& r, Value* body_code) {
684: return r.process(*body_code);
685: }
1.129 paf 686: static void _try_operator(Request& r, MethodParams& params) {
687: Value& body_code=params.as_junction(0, "body_code must be code");
688: Value& catch_code=params.as_junction(1, "catch_code must be code");
1.74 paf 689:
1.136 paf 690: Try_catch_result result=try_catch(r,
691: process_try_body_code, &body_code,
692: &catch_code);
693:
694: if(result.exception_should_be_handled)
695: throw Exception("parser.runtime",
696: result.exception_should_be_handled,
697: "catch block must set $exception.handled to some boolean value, not string");
1.123 paf 698:
1.136 paf 699: // write out processed body_code or catch_code
700: r.write_pass_lang(result.processed_code);
1.74 paf 701: }
702:
1.138 paf 703: static void _throw_operator(Request&, MethodParams& params) {
1.129 paf 704: if(params.count()==1) {
705: if(HashStringValue *hash=params[0].get_hash()) {
706: const char* type=0;
707: if(Value* value=hash->get(exception_type_part_name))
1.78 paf 708: type=value->as_string().cstr();
1.129 paf 709: const String* source=0;
710: if(Value* value=hash->get(exception_source_part_name))
1.74 paf 711: source=&value->as_string();
1.138 paf 712: const char* comment=0;
1.129 paf 713: if(Value* value=hash->get(exception_comment_part_name))
1.74 paf 714: comment=value->as_string().cstr();
715:
1.78 paf 716: throw Exception(type,
1.129 paf 717: source?source:0,
718: "%s", comment?comment:"");
1.74 paf 719: } else
1.78 paf 720: throw Exception("parser.runtime",
1.129 paf 721: 0,
1.74 paf 722: "one-param version has hash param");
723: } else {
1.129 paf 724: const char* type=params.as_string(0, "type must be string").cstr();
725: const String& source=params.as_string(1, "source must be string");
726: const char* comment=params.count()>2? params.as_string(2, "comment must be string").cstr()
727: :0;
1.97 paf 728: throw Exception(type, &source, "%s", comment?comment:"");
1.74 paf 729: }
1.132 paf 730: }
1.129 paf 731:
732: #if defined(WIN32) && defined(_DEBUG)
733: # define PA_BPT
1.138 paf 734: static void _bpt(Request&, MethodParams&) {
1.129 paf 735: _asm int 3;
736: }
737: #endif
738:
1.10 paf 739: // constructor
740:
1.129 paf 741: VClassMAIN::VClassMAIN(): VClass() {
742: set_name(*new String(MAIN_CLASS_NAME));
743:
744: #ifdef PA_BPT
745: // ^bpt[]
746: add_native_method("bpt", Method::CT_ANY, _bpt, 0, 0);
747: #endif
1.121 paf 748:
1.1 paf 749: // ^if(condition){code-when-true}
750: // ^if(condition){code-when-true}{code-when-false}
1.10 paf 751: add_native_method("if", Method::CT_ANY, _if, 2, 3);
1.1 paf 752:
753: // ^untaint[as-is|uri|sql|js|html|html-typo]{code}
1.59 paf 754: add_native_method("untaint", Method::CT_ANY, _untaint, 1, 2);
1.1 paf 755:
756: // ^taint[as-is|uri|sql|js|html|html-typo]{code}
1.10 paf 757: add_native_method("taint", Method::CT_ANY, _taint, 1, 2);
1.1 paf 758:
759: // ^process[code]
1.116 paf 760: add_native_method("process", Method::CT_ANY, _process, 1, 2);
1.1 paf 761:
762: // ^rem{code}
1.51 parser 763: add_native_method("rem", Method::CT_ANY, _rem, 1, 10000);
1.1 paf 764:
765: // ^while(condition){code}
1.10 paf 766: add_native_method("while", Method::CT_ANY, _while, 2, 2);
1.1 paf 767:
768: // ^use[file]
1.10 paf 769: add_native_method("use", Method::CT_ANY, _use, 1, 1);
1.1 paf 770:
1.54 paf 771: // ^for[i](from-number;to-number-inclusive){code}[delim]
1.10 paf 772: add_native_method("for", Method::CT_ANY, _for, 3+1, 3+1+1);
1.1 paf 773:
774: // ^eval(expr)
775: // ^eval(expr)[format]
1.10 paf 776: add_native_method("eval", Method::CT_ANY, _eval, 1, 2);
1.52 parser 777:
1.1 paf 778: // ^connect[protocol://user:pass@host[:port]/database]{code with ^sql-s}
1.10 paf 779: add_native_method("connect", Method::CT_ANY, _connect, 2, 2);
780:
1.63 paf 781:
1.136 paf 782: // ^cache[file_spec](time){code}[{catch code}] time=0 no cache
1.65 paf 783: // ^cache[file_spec] delete cache
1.136 paf 784: add_native_method("cache", Method::CT_ANY, _cache, 1, 4);
1.63 paf 785:
1.28 parser 786: // switch
787:
788: // ^switch[value]{cases}
789: add_native_method("switch", Method::CT_ANY, _switch, 2, 2);
790:
791: // ^case[value]{code}
1.51 parser 792: add_native_method("case", Method::CT_ANY, _case, 2, 10000);
1.74 paf 793:
794: // try-catch
795:
796: // ^try{code}{catch code}
797: add_native_method("try", Method::CT_ANY, _try_operator, 2, 2);
798: // ^throw[$exception hash]
799: // ^throw[type;source;comment]
800: add_native_method("throw", Method::CT_ANY, _throw_operator, 1, 3);
801:
1.10 paf 802: }
1.11 paf 803:
804: // constructor & configurator
1.1 paf 805:
1.129 paf 806: VStateless_class& VClassMAIN_create() {
807: return *new VClassMAIN;
1.1 paf 808: }
E-mail:
![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to op.C CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [parser3project] / parser3 / src / classes