Annotation of parser3/src/classes/op.C, revision 1.135
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:
1.135 ! paf 8: static const char* IDENT_OP_C="$Date: 2003/11/06 09:16:33 $";
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:
52: // helpers
53:
1.130 paf 54: class Untaint_lang_name2enum: public Hash<const String::Body, String::Language> {
1.129 paf 55: public:
56: Untaint_lang_name2enum() {
57: #define ULN(name, LANG) \
1.130 paf 58: put(String::Body(name), (value_type)(String::L_##LANG));
1.129 paf 59: ULN("as-is", AS_IS);
60: ULN("optimized-as-is", AS_IS|String::L_OPTIMIZE_BIT);
61: ULN("file-spec", FILE_SPEC);
62: ULN("http-header", HTTP_HEADER);
63: ULN("mail-header", MAIL_HEADER);
64: ULN("uri", URI);
65: ULN("table", TABLE);
66: ULN("sql", SQL);
67: ULN("js", JS);
68: ULN("xml", XML);
69: ULN("optimized-xml", XML|String::L_OPTIMIZE_BIT);
70: ULN("html", HTML);
71: ULN("optimized-html", HTML|String::L_OPTIMIZE_BIT);
72: #undef ULN
73: }
74: } untaint_lang_name2enum;
75:
1.10 paf 76: // methods
77:
1.129 paf 78: static void _if(Request& r, MethodParams& params) {
79: Value& condition_code=params.as_junction(0, "condition must be expression");
1.1 paf 80:
1.81 paf 81: bool condition=r.process_to_value(condition_code,
1.83 paf 82: /*0/*no name* /,*/
1.1 paf 83: false/*don't intercept string*/).as_bool();
1.6 paf 84: if(condition)
1.129 paf 85: r.write_pass_lang(r.process(params.as_junction(1, "'then' parameter must be code")));
86: else if(params.count()>2)
87: r.write_pass_lang(r.process(params.as_junction(2, "'else' parameter must be code")));
1.1 paf 88: }
89:
1.129 paf 90: static void _untaint(Request& r, MethodParams& params) {
1.1 paf 91:
1.129 paf 92: String::Language lang;
93: if(params.count()==1)
94: lang=String::L_AS_IS; // mark as simply 'tainted'. useful in html from sql
1.59 paf 95: else {
1.129 paf 96: const String& lang_name=params.as_string(0, "lang must be string");
97: lang=untaint_lang_name2enum.get(lang_name);
1.59 paf 98: if(!lang)
1.78 paf 99: throw Exception(0,
1.59 paf 100: &lang_name,
101: "invalid taint language");
102: }
1.1 paf 103:
104: {
1.129 paf 105: Value& vbody=params.as_junction(params.count()-1, "body must be code");
1.1 paf 106:
107: Temp_lang temp_lang(r, lang); // set temporarily specified ^untaint[language;
1.86 paf 108: r.write_pass_lang(r.process(vbody)); // process marking tainted with that lang
1.1 paf 109: }
110: }
111:
1.129 paf 112: static void _taint(Request& r, MethodParams& params) {
113: String::Language lang;
114: if(params.count()==1)
115: lang=String::L_TAINTED; // mark as simply 'tainted'. useful in table:set
1.1 paf 116: else {
1.129 paf 117: const String& lang_name=params.as_string(0, "lang must be string");
118: lang=untaint_lang_name2enum.get(lang_name);
1.1 paf 119: if(!lang)
1.78 paf 120: throw Exception(0,
1.3 paf 121: &lang_name,
122: "invalid taint language");
1.1 paf 123: }
124:
125: {
1.129 paf 126: Value& vbody=params.as_no_junction(params.count()-1, "body must not be code");
1.1 paf 127:
1.129 paf 128: String result;
1.1 paf 129: result.append(
130: vbody.as_string(), // process marking tainted with that lang
131: lang, true); // force result language to specified
132: r.write_pass_lang(result);
133: }
134: }
135:
1.129 paf 136: static void _process(Request& r, MethodParams& params) {
137: Method* main_method;
138:
139: size_t index=0;
140: Value* target_self;
141: Value& maybe_target_self=params[index];
142: if(maybe_target_self.get_string() || maybe_target_self.get_junction())
143: target_self=&r.get_method_frame()->caller()->self();
144: else {
145: target_self=&maybe_target_self; index++;
146: }
147:
1.1 paf 148: {
1.129 paf 149: VStateless_class *target_class=target_self->get_last_derived_class();
1.116 paf 150: if(!target_class)
151: throw Exception("parser.runtime",
1.129 paf 152: 0,
1.116 paf 153: "no target class");
1.114 paf 154:
1.73 paf 155: // temporary remove language change
1.129 paf 156: Temp_lang temp_lang(r, String::L_PASS_APPENDED);
1.1 paf 157: // temporary zero @main so to maybe-replace it in processed code
1.129 paf 158: Temp_method temp_method_main(*target_class, main_method_name, 0);
1.1 paf 159: // temporary zero @auto so it wouldn't be auto-called in Request::use_buf
1.129 paf 160: Temp_method temp_method_auto(*target_class, auto_method_name, 0);
161:
162: size_t main_alias_index=index+1;
163: const String* main_alias=0;
164: if(main_alias_index<params.count())
165: main_alias=¶ms.as_string(main_alias_index, "main alias must be string");
166:
167: if(const String* file_name=params[index].get_string()) { // ^process...[file]
168: r.use_file(*target_class, r.absolute(*file_name), main_alias, true/*ignore_class_path*/);
169: } else { // process...{string}
170: Value& vjunction=params.as_junction(index, "body must be code");
171: // evaluate source to process
172: const String& source=r.process_to_string(vjunction);
173: r.use_buf(*target_class,
174: source.cstr(String::L_UNSPECIFIED, r.connection(false)),
175: main_alias,
176: pseudo_file_no__process);
177: }
1.1 paf 178:
1.73 paf 179: // main_method
1.129 paf 180: main_method=target_class->get_method(main_method_name);
1.73 paf 181: }
182: // after restoring current-request-lang
183: // maybe-execute @main[]
184: if(main_method) {
1.119 paf 185: // temporarily set method_frame's self to target_self
1.129 paf 186: Temp_method_frame_self tmfs(*r.get_method_frame(), *target_self);
1.73 paf 187: // execute!
188: r.execute(*main_method->parser_code);
1.1 paf 189: }
190: }
191:
1.129 paf 192: static void _rem(Request& r, MethodParams& params) {
193: params.as_junction(0, "body must be code");
1.1 paf 194: }
195:
1.129 paf 196: static void _while(Request& r, MethodParams& params) {
197: Value& vcondition=params.as_junction(0, "condition must be expression");
198: Value& body=params.as_junction(1, "body must be code");
1.1 paf 199:
200: // while...
201: int endless_loop_count=0;
202: while(true) {
1.18 parser 203: if(++endless_loop_count>=MAX_LOOPS) // endless loop?
1.78 paf 204: throw Exception("parser.runtime",
1.129 paf 205: 0,
1.1 paf 206: "endless loop detected");
207:
1.86 paf 208: bool condition=r.process_to_value(vcondition,
1.83 paf 209: /*0/*no name* /,*/
1.1 paf 210: false/*don't intercept string*/).as_bool();
211: if(!condition) // ...condition is true
212: break;
213:
214: // write processed body
1.86 paf 215: r.write_pass_lang(r.process(body));
1.1 paf 216: }
217: }
218:
1.129 paf 219: static void _use(Request& r, MethodParams& params) {
220: Value& vfile=params.as_no_junction(0, "file name must not be code");
1.113 paf 221: r.use_file(r.main_class, vfile.as_string());
1.1 paf 222: }
223:
1.129 paf 224: static void _for(Request& r, MethodParams& params) {
225: const String& var_name=params.as_string(0, "var name must be string");
226: int from=params.as_int(1, "from must be int", r);
227: int to=params.as_int(2, "to must be int", r);
228: Value& body_code=params.as_junction(3, "body must be code");
229: Value* delim_maybe_code=params.count()>4?¶ms[4]:0;
1.1 paf 230:
1.57 paf 231: if(to-from>=MAX_LOOPS) // too long loop?
1.78 paf 232: throw Exception("parser.runtime",
1.129 paf 233: 0,
1.57 paf 234: "endless loop detected");
235:
1.1 paf 236: bool need_delim=false;
1.129 paf 237: VInt* vint=new VInt(0);
1.117 paf 238: r.get_method_frame()->caller()->put_element(var_name, vint, false);
1.1 paf 239: for(int i=from; i<=to; i++) {
240: vint->set_int(i);
241:
1.108 paf 242: StringOrValue sv_processed=r.process(body_code);
1.129 paf 243: const String* s_processed=sv_processed.get_string();
244: if(delim_maybe_code && s_processed && s_processed->length()) { // delimiter set and we have body
1.108 paf 245: if(need_delim) // need delim & iteration produced string?
1.86 paf 246: r.write_pass_lang(r.process(*delim_maybe_code));
1.1 paf 247: need_delim=true;
248: }
1.108 paf 249: r.write_pass_lang(sv_processed);
1.1 paf 250: }
251: }
252:
1.129 paf 253: static void _eval(Request& r, MethodParams& params) {
254: Value& expr=params.as_junction(0, "need expression");
1.1 paf 255: // evaluate expresion
1.129 paf 256: Value& value_result=r.process_to_value(expr,
1.83 paf 257: /*0/*no name YET* /,*/
1.1 paf 258: true/*don't intercept string*/).as_expr_result();
1.129 paf 259: if(params.count()>1) {
260: Value& fmt=params.as_no_junction(1, "fmt must not be code");
261: r.write_no_lang(String(format(value_result.as_double(), fmt.as_string().cstrm())));
1.91 paf 262: } else
1.129 paf 263: r.write_no_lang(value_result);
1.1 paf 264: }
265:
1.129 paf 266: static void _connect(Request& r, MethodParams& params) {
1.63 paf 267: #ifdef RESOURCES_DEBUG
268: struct timeval mt[2];
269: #endif
1.129 paf 270: Value& url=params.as_no_junction(0, "url must not be code");
271: Value& body_code=params.as_junction(1, "body must be code");
1.1 paf 272:
1.129 paf 273: Table* protocol2driver_and_client=0;
274: if(Value* sql=r.main_class.get_element(String(MAIN_SQL_NAME), r.main_class, false)) {
275: if(Value* element=sql->get_element(String(MAIN_SQL_DRIVERS_NAME), *sql, false)) {
1.113 paf 276: protocol2driver_and_client=element->get_table();
277: }
278: }
1.11 paf 279:
1.63 paf 280: #ifdef RESOURCES_DEBUG
281: //measure:before
282: gettimeofday(&mt[0],NULL);
283: #endif
1.1 paf 284: // connect
1.129 paf 285: SQL_Connection* connection=SQL_driver_manager.get_connection(url.as_string(),
286: protocol2driver_and_client);
1.1 paf 287:
1.63 paf 288: #ifdef RESOURCES_DEBUG
289: //measure:after connect
290: gettimeofday(&mt[1],NULL);
291:
292: double t[2];
293: for(int i=0;i<2;i++)
294: t[i]=mt[i].tv_sec+mt[i].tv_usec/1000000.0;
295:
296: r.sql_connect_time+=t[1]-t[0];
297: #endif
1.129 paf 298: Temp_connection temp_connection(r, connection);
1.1 paf 299: // execute body
1.53 parser 300: try {
1.86 paf 301: r.write_assign_lang(r.process(body_code));
1.129 paf 302: connection->commit();
303: connection->close();
1.75 paf 304: } catch(...) { // process problem
1.129 paf 305: connection->rollback();
306: connection->close();
307: rethrow;
1.1 paf 308: }
309: }
310:
1.41 parser 311: #ifndef DOXYGEN
1.129 paf 312: class Switch_data: public PA_Object {
313: public:
314: Request& r;
315: Value& searching;
316: Value* found;
317: Value* _default;
318: public:
319: Switch_data(Request& ar, Value& asearching):
320: r(ar), searching(asearching) {}
1.28 parser 321: };
1.41 parser 322: #endif
1.129 paf 323: static void _switch(Request& r, MethodParams& params) {
324: Switch_data* data=new Switch_data(r, r.process_to_value(params[0]));
1.135 ! paf 325: Temp_hash_value<const String::Body, void*>
1.129 paf 326: switch_data_setter(r.classes_conf, switch_data_name, data);
1.28 parser 327:
1.129 paf 328: Value& cases_code=params.as_junction(1, "switch cases must be code");
1.82 paf 329: // execution of found ^case[...]{code} must be in context of ^switch[...]{code}
330: // because of stacked WWrapper used there as wcontext
1.84 paf 331: r.process(cases_code, true/*intercept_string*/);
1.129 paf 332: if(Value* selected_code=data->found? data->found: data->_default) {
1.83 paf 333: // setting code context, would execute in ^switch[...]{>>context<<}
1.105 paf 334: //selected_code->get_junction()->change_context(cases_code.get_junction());
1.107 paf 335: r.write_pass_lang(r.process(*selected_code));
1.83 paf 336: }
1.28 parser 337: }
338:
1.129 paf 339: static void _case(Request& r, MethodParams& params) {
340: Switch_data* data=static_cast<Switch_data*>(r.classes_conf.get(switch_data_name));
1.38 parser 341: if(!data)
1.78 paf 342: throw Exception("parser.runtime",
1.129 paf 343: 0,
1.38 parser 344: "without switch");
1.28 parser 345:
1.129 paf 346: int count=params.count();
347: Value& code=params.as_junction(--count, "case result must be code");
1.83 paf 348:
349: // killing context for safety, would execute in ^switch[...]{>>context<<}
350: // reason: context is stacked, and it would become invalid afterwards
1.105 paf 351: //code->get_junction()->change_context(0);
1.83 paf 352:
1.28 parser 353: for(int i=0; i<count; i++) {
1.129 paf 354: Value& value=r.process_to_value(params[i]);
1.28 parser 355:
1.82 paf 356: if(value.as_string() == CASE_DEFAULT_VALUE) {
1.129 paf 357: data->_default=&code;
1.28 parser 358: break;
359: }
360:
361: bool matches;
1.129 paf 362: if(data->searching.is_string())
363: matches=data->searching.as_string() == value.as_string();
1.28 parser 364: else
1.129 paf 365: matches=data->searching.as_double() == value.as_double();
1.28 parser 366:
367: if(matches) {
1.82 paf 368: if(data->found)
369: throw Exception("parser.runtime",
1.129 paf 370: 0,
1.82 paf 371: "duplicate found");
372:
1.129 paf 373: data->found=&code;
1.28 parser 374: break;
375: }
376: }
377: }
378:
1.63 paf 379: // cache--
380:
381: // consts
382:
1.131 paf 383: const int DATA_STRING_SERIALIZED_VERSION=0x0005;
1.63 paf 384:
385: // helper types
386:
387: #ifndef DOXYGEN
388: struct Data_string_serialized_prolog {
389: int version;
1.79 paf 390: time_t expires;
1.63 paf 391: };
392: #endif
393:
1.68 paf 394: void cache_delete(const String& file_spec) {
395: file_delete(file_spec, false/*fail_on_read_problem*/);
1.63 paf 396: }
1.69 paf 397:
398: #ifndef DOXYGEN
1.135 ! paf 399: struct Cache_scope {
1.129 paf 400: public:
1.79 paf 401: time_t expires;
1.135 ! paf 402: const String* body_from_disk;
1.79 paf 403: };
1.69 paf 404: struct Locked_process_and_cache_put_action_info {
405: Request *r;
1.135 ! paf 406: Cache_scope *data;
1.129 paf 407: Value* body_code; const String* evaluated_body;
1.69 paf 408: };
409: #endif
1.129 paf 410: /* @todo maybe network order worth spending some effort?
411: don't bothering myself with network byte order,
412: am not planning to be able to move resulting file across platforms
413: */
1.69 paf 414: static void locked_process_and_cache_put_action(int f, void *context) {
415: Locked_process_and_cache_put_action_info& info=
416: *static_cast<Locked_process_and_cache_put_action_info *>(context);
1.129 paf 417:
1.69 paf 418: // body->process
1.81 paf 419: info.evaluated_body=&info.r->process_to_string(*info.body_code);
1.69 paf 420:
1.79 paf 421: // expiration time not spoiled by ^cache(0) or something?
422: if(info.data->expires > time(0)) {
423: // string -serialize> buffer
1.129 paf 424: String::Cm serialized=info.evaluated_body->serialize(
425: sizeof(Data_string_serialized_prolog));
1.79 paf 426: Data_string_serialized_prolog& prolog=
1.129 paf 427: *reinterpret_cast<Data_string_serialized_prolog *>(serialized.str);
1.79 paf 428: prolog.version=DATA_STRING_SERIALIZED_VERSION;
429: prolog.expires=info.data->expires;
430:
431: // buffer -write> file
1.129 paf 432: write(f, serialized.str, serialized.length);
1.79 paf 433: } else // expired!
434: info.data->expires=0; // flag it so that could be easily checked by caller
1.69 paf 435: }
1.129 paf 436: const String* locked_process_and_cache_put(Request& r,
1.128 paf 437: Value& body_code,
1.135 ! paf 438: Cache_scope& data,
1.128 paf 439: const String& file_spec) {
1.129 paf 440: Locked_process_and_cache_put_action_info info={0};
441: info.r=&r;
442: info.data=&data;
443: info.body_code=&body_code;
1.69 paf 444:
1.129 paf 445: const String* result=file_write_action_under_lock(
1.69 paf 446: file_spec,
447: "cache_put", locked_process_and_cache_put_action, &info,
448: false/*as_text*/,
449: false/*do_append*/,
1.96 paf 450: false/*block*/,
451: false/*fail on lock problem*/) ? info.evaluated_body: 0;
1.100 paf 452: time_t now=time(0);
453: if(data.expires<=now)
1.79 paf 454: cache_delete(file_spec);
455: return result;
1.63 paf 456: }
1.135 ! paf 457: struct Cache_get_result {
! 458: const String* body;
! 459: bool expired;
! 460: } cache_get(Request_charsets& charsets, const String& file_spec, time_t now) {
! 461: Cache_get_result result={0};
! 462:
1.129 paf 463: File_read_result file=file_read(charsets, file_spec,
1.63 paf 464: false/*as_text*/,
1.129 paf 465: 0, //no params
466: false/*fail_on_read_problem*/);
467: if(file.success && file.length/* ignore reads which are empty due to
1.72 paf 468: non-unary open+lockEX conflict with lockSH */) {
1.129 paf 469:
1.72 paf 470: Data_string_serialized_prolog& prolog=
1.129 paf 471: *reinterpret_cast<Data_string_serialized_prolog *>(file.str);
1.63 paf 472:
1.135 ! paf 473: String* body=new String;
1.72 paf 474: if(
1.129 paf 475: file.length>=sizeof(Data_string_serialized_prolog)
1.135 ! paf 476: && prolog.version==DATA_STRING_SERIALIZED_VERSION) {
! 477: if(body->deserialize(sizeof(Data_string_serialized_prolog), file.str, file.length)) {
! 478: result.body=body;
! 479: result.expired=prolog.expires <= now;
! 480: }
! 481: }
1.72 paf 482: }
1.63 paf 483:
1.135 ! paf 484: return result;
1.63 paf 485: }
1.129 paf 486: static time_t as_expires(Request& r, MethodParams& params,
1.79 paf 487: int index, time_t now) {
488: time_t result;
1.129 paf 489: if(Value* vdate=params[index].as(VDATE_TYPE, false))
490: result=static_cast<VDate*>(vdate)->get_time();
1.79 paf 491: else
1.129 paf 492: result=now+(time_t)params.as_double(index, "lifespan must be date or number", r);
1.79 paf 493:
494: return result;
495: }
1.129 paf 496: static const String& as_file_spec(Request& r, MethodParams& params, int index) {
497: return r.absolute(params.as_string(index, "filespec must be string"));
1.79 paf 498: }
1.129 paf 499: static void _cache(Request& r, MethodParams& params) {
1.79 paf 500: time_t now=time(0);
501:
1.135 ! paf 502: if(params.count()==0) {
! 503: Cache_scope* scope=static_cast<Cache_scope*>(r.classes_conf.get(cache_data_name));
! 504: if(!scope)
! 505: throw Exception("parser.runtime",
! 506: 0,
! 507: "getting old cache body without cache");
! 508:
! 509: if(const String* body_from_disk=scope->body_from_disk) // we have something old
! 510: r.write_assign_lang(*body_from_disk);
! 511: else
! 512: throw Exception(0,
! 513: 0,
! 514: "there is no old cached body");
! 515:
! 516: return;
! 517: }
! 518:
1.79 paf 519: // ^cache[filename] ^cache(seconds) ^cache[expires date]
1.129 paf 520: if(params.count()==1) {
521: if(params[0].is_string()) { // filename?
1.79 paf 522: cache_delete(as_file_spec(r, params, 0));
523: return;
524: }
525:
526: // secods|expires date
1.135 ! paf 527: Cache_scope* scope=static_cast<Cache_scope*>(r.classes_conf.get(cache_data_name));
! 528: if(!scope)
1.79 paf 529: throw Exception("parser.runtime",
1.129 paf 530: 0,
1.79 paf 531: "expire-time reducing instruction without cache");
532:
1.129 paf 533: time_t expires=as_expires(r, params, 0, now);
1.135 ! paf 534: if(expires < scope->expires)
! 535: scope->expires=expires;
1.79 paf 536:
537: return;
538: }
1.63 paf 539:
540: // file_spec, expires, body code
1.129 paf 541: const String& file_spec=r.absolute(params.as_string(0, "filespec must be string"));
1.65 paf 542:
1.135 ! paf 543: Cache_scope scope={as_expires(r, params, 1, now)};
! 544:
! 545: Temp_hash_value<const String::Body, void*>
! 546: cache_scope_setter(r.classes_conf, cache_data_name, &scope);
1.129 paf 547: Value& body_code=params.as_junction(2, "body must be code");
1.63 paf 548:
1.135 ! paf 549: if(scope.expires>now) { // valid 'expires' specified? try cached copy...
1.69 paf 550: // hence we don't hope to have unary create/lockEX
551: // we need some plan to live in a life like that, so...
552: // worst races plan:
553: // A B
554: // open
555: // |open
556: // lockSH
557: // |nonblocking-lockEX fails
558: // unlockSH
559: // close, cache_get returns 0
560: // open
561: // nonblocking-lockEX succeeds; process, write, close
562: // |retry1: open
563: // ...
564: // |lockSH succeeds; ...
565:
566: for(int retry=0; retry<2; retry++) {
1.135 ! paf 567: Cache_get_result cached=cache_get(r.charsets, file_spec, now);
! 568: if(cached.body) { // have cached copy?
! 569: if(cached.expired)
! 570: scope.body_from_disk=cached.body; // storing for user to retrive it with ^cache[]
! 571: else
! 572: { // and it's not expired yet
! 573: // write it out
! 574: r.write_assign_lang(*cached.body);
! 575: // happy with it
! 576: return;
! 577: }
1.79 paf 578: }
1.69 paf 579:
1.135 ! paf 580: // non-blocked lock; process; cache it
! 581: if(const String* processed_body=
! 582: locked_process_and_cache_put(r, body_code, scope, file_spec)) {
! 583: // write it out
! 584: r.write_assign_lang(*processed_body);
! 585: // happy with it
! 586: return;
! 587: } else { // somebody writing result right now
! 588: pa_sleep(0, 500000); // waiting half a second
! 589: retry=0; // prolonging our wait, than could cache_get it, without processing body_code
! 590: }
1.69 paf 591: }
1.78 paf 592: throw Exception(0,
1.69 paf 593: &file_spec,
594: "locking problem");
595: } else {
1.79 paf 596: // instructed not to cache; forget cached copy
1.68 paf 597: cache_delete(file_spec);
1.69 paf 598: // process
1.81 paf 599: const String& processed_body=r.process_to_string(body_code);
1.69 paf 600: // write it out
601: r.write_assign_lang(processed_body);
602: // happy with it
603: return;
604: }
605: // never reached
1.63 paf 606: }
607:
1.74 paf 608:
609:
1.129 paf 610: // also used in pa_request.C to pass param to @unhandled_exception
1.74 paf 611:
1.129 paf 612: static void _try_operator(Request& r, MethodParams& params) {
613: Value& body_code=params.as_junction(0, "body_code must be code");
614: Value& catch_code=params.as_junction(1, "catch_code must be code");
1.74 paf 615:
1.86 paf 616: StringOrValue result;
1.123 paf 617: // taking snapshot of try-context
618: Request_context_saver try_context(r);
1.74 paf 619: try {
1.86 paf 620: result=r.process(body_code);
1.74 paf 621: } catch(const Exception& e) {
1.133 paf 622: Request_context_saver throw_context(r); // taking snapshot of throw-context [stack trace contains error]
1.129 paf 623: Request::Exception_details details=r.get_details(e);
1.123 paf 624: try_context.restore(); // restoring try-context to perform catch-code
625:
1.129 paf 626: Junction* junction=catch_code.get_junction();
627: Value* method_frame=junction->method_frame;
628: Value* saved_exception_var_value=method_frame->get_element(exception_var_name, *method_frame, false);
629: junction->method_frame->put_element(exception_var_name, &details.vhash, false);
1.86 paf 630: result=r.process(catch_code);
1.74 paf 631: bool handled=false;
1.129 paf 632: if(Value* value=
633: details.vhash.hash().get(exception_handled_part_name))
1.74 paf 634: handled=value->as_bool();
1.129 paf 635: junction->method_frame->put_element(exception_var_name, saved_exception_var_value, false);
1.74 paf 636:
1.123 paf 637: if(!handled) {
638: throw_context.restore(); // restoring throw-context [exception were not handled]
1.129 paf 639: rethrow;
1.123 paf 640: }
1.74 paf 641: }
1.123 paf 642: // write out result
1.86 paf 643: r.write_pass_lang(result);
1.74 paf 644: }
645:
1.129 paf 646: static void _throw_operator(Request& r, MethodParams& params) {
647: if(params.count()==1) {
648: if(HashStringValue *hash=params[0].get_hash()) {
649: const char* type=0;
650: if(Value* value=hash->get(exception_type_part_name))
1.78 paf 651: type=value->as_string().cstr();
1.129 paf 652: const String* source=0;
653: if(Value* value=hash->get(exception_source_part_name))
1.74 paf 654: source=&value->as_string();
1.129 paf 655: const char* comment;
656: if(Value* value=hash->get(exception_comment_part_name))
1.74 paf 657: comment=value->as_string().cstr();
658:
1.78 paf 659: throw Exception(type,
1.129 paf 660: source?source:0,
661: "%s", comment?comment:"");
1.74 paf 662: } else
1.78 paf 663: throw Exception("parser.runtime",
1.129 paf 664: 0,
1.74 paf 665: "one-param version has hash param");
666: } else {
1.129 paf 667: const char* type=params.as_string(0, "type must be string").cstr();
668: const String& source=params.as_string(1, "source must be string");
669: const char* comment=params.count()>2? params.as_string(2, "comment must be string").cstr()
670: :0;
1.97 paf 671: throw Exception(type, &source, "%s", comment?comment:"");
1.74 paf 672: }
1.132 paf 673: }
1.129 paf 674:
675: #if defined(WIN32) && defined(_DEBUG)
676: # define PA_BPT
677: static void _bpt(Request& r, MethodParams& params) {
678: _asm int 3;
679: }
680: #endif
681:
1.10 paf 682: // constructor
683:
1.129 paf 684: VClassMAIN::VClassMAIN(): VClass() {
685: set_name(*new String(MAIN_CLASS_NAME));
686:
687: #ifdef PA_BPT
688: // ^bpt[]
689: add_native_method("bpt", Method::CT_ANY, _bpt, 0, 0);
690: #endif
1.121 paf 691:
1.1 paf 692: // ^if(condition){code-when-true}
693: // ^if(condition){code-when-true}{code-when-false}
1.10 paf 694: add_native_method("if", Method::CT_ANY, _if, 2, 3);
1.1 paf 695:
696: // ^untaint[as-is|uri|sql|js|html|html-typo]{code}
1.59 paf 697: add_native_method("untaint", Method::CT_ANY, _untaint, 1, 2);
1.1 paf 698:
699: // ^taint[as-is|uri|sql|js|html|html-typo]{code}
1.10 paf 700: add_native_method("taint", Method::CT_ANY, _taint, 1, 2);
1.1 paf 701:
702: // ^process[code]
1.116 paf 703: add_native_method("process", Method::CT_ANY, _process, 1, 2);
1.1 paf 704:
705: // ^rem{code}
1.51 parser 706: add_native_method("rem", Method::CT_ANY, _rem, 1, 10000);
1.1 paf 707:
708: // ^while(condition){code}
1.10 paf 709: add_native_method("while", Method::CT_ANY, _while, 2, 2);
1.1 paf 710:
711: // ^use[file]
1.10 paf 712: add_native_method("use", Method::CT_ANY, _use, 1, 1);
1.1 paf 713:
1.54 paf 714: // ^for[i](from-number;to-number-inclusive){code}[delim]
1.10 paf 715: add_native_method("for", Method::CT_ANY, _for, 3+1, 3+1+1);
1.1 paf 716:
717: // ^eval(expr)
718: // ^eval(expr)[format]
1.10 paf 719: add_native_method("eval", Method::CT_ANY, _eval, 1, 2);
1.52 parser 720:
1.1 paf 721: // ^connect[protocol://user:pass@host[:port]/database]{code with ^sql-s}
1.10 paf 722: add_native_method("connect", Method::CT_ANY, _connect, 2, 2);
723:
1.63 paf 724:
1.135 ! paf 725: // ^cache[file_spec](time){code} time=0 no cache
1.65 paf 726: // ^cache[file_spec] delete cache
1.135 ! paf 727: // ^cache[] retrive old cached body, if any
! 728: add_native_method("cache", Method::CT_ANY, _cache, 0, 3);
1.63 paf 729:
1.28 parser 730: // switch
731:
732: // ^switch[value]{cases}
733: add_native_method("switch", Method::CT_ANY, _switch, 2, 2);
734:
735: // ^case[value]{code}
1.51 parser 736: add_native_method("case", Method::CT_ANY, _case, 2, 10000);
1.74 paf 737:
738: // try-catch
739:
740: // ^try{code}{catch code}
741: add_native_method("try", Method::CT_ANY, _try_operator, 2, 2);
742: // ^throw[$exception hash]
743: // ^throw[type;source;comment]
744: add_native_method("throw", Method::CT_ANY, _throw_operator, 1, 3);
745:
1.10 paf 746: }
1.11 paf 747:
748: // constructor & configurator
1.1 paf 749:
1.129 paf 750: VStateless_class& VClassMAIN_create() {
751: return *new VClassMAIN;
1.1 paf 752: }
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