Annotation of parser3/src/classes/op.C, revision 1.54
1.1 paf 1: /** @file
1.9 paf 2: Parser: parser @b operators.
1.1 paf 3:
4: Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
1.45 parser 5: Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
1.1 paf 6:
1.54 ! paf 7: $Id: op.C,v 1.53 2001/10/19 12:43:29 parser Exp $
1.1 paf 8: */
9:
1.13 paf 10: #include "classes.h"
1.1 paf 11: #include "pa_config_includes.h"
12: #include "pa_common.h"
13: #include "pa_request.h"
14: #include "pa_vint.h"
15: #include "pa_sql_connection.h"
16:
1.18 parser 17: // limits
18:
19: #define MAX_LOOPS 10000
20:
1.10 paf 21: // defines
22:
23: #define OP_CLASS_NAME "OP"
1.11 paf 24:
1.10 paf 25: // class
26:
27: class MOP : public Methoded {
28: public:
29: MOP(Pool& pool);
1.11 paf 30: public: // Methoded
1.10 paf 31: bool used_directly() { return true; }
1.11 paf 32: void configure_user(Request& r);
1.36 parser 33:
1.11 paf 34: private:
35: String main_sql_name;
36: String main_sql_drivers_name;
1.10 paf 37: };
38:
39: // methods
40:
1.5 paf 41: static void _if(Request& r, const String&, MethodParams *params) {
1.48 parser 42: Value& condition_code=params->as_junction(0, "condition must be expression");
1.1 paf 43:
44: bool condition=r.process(condition_code,
45: 0/*no name*/,
46: false/*don't intercept string*/).as_bool();
1.6 paf 47: if(condition)
1.34 parser 48: r.write_pass_lang(r.process(params->as_junction(1, "'then' parameter must be code")));
1.50 parser 49: else if(params->size()>2)
1.34 parser 50: r.write_pass_lang(r.process(params->as_junction(2, "'else' parameter must be code")));
1.1 paf 51: }
52:
1.5 paf 53: static void _untaint(Request& r, const String& method_name, MethodParams *params) {
1.1 paf 54: Pool& pool=r.pool();
55:
1.48 parser 56: const String& lang_name=params->as_string(0, "lang must be string");
1.1 paf 57: String::Untaint_lang lang=static_cast<String::Untaint_lang>(
58: untaint_lang_name2enum->get_int(lang_name));
59: if(!lang)
1.53 parser 60: throw Exception(0, 0,
1.1 paf 61: &lang_name,
62: "invalid untaint language");
63:
64: {
1.34 parser 65: Value& vbody=params->as_junction(1, "body must be code");
1.1 paf 66:
67: Temp_lang temp_lang(r, lang); // set temporarily specified ^untaint[language;
1.5 paf 68: r.write_pass_lang(r.process(vbody)); // process marking tainted with that lang
1.1 paf 69: }
70: }
71:
1.5 paf 72: static void _taint(Request& r, const String&, MethodParams *params) {
1.1 paf 73: Pool& pool=r.pool();
74:
75: String::Untaint_lang lang;
76: if(params->size()==1)
77: lang=String::UL_TAINTED; // mark as simply 'tainted'. useful in table:set
78: else {
1.48 parser 79: const String& lang_name=params->as_string(0, "lang must be string");
1.1 paf 80: lang=static_cast<String::Untaint_lang>(
81: untaint_lang_name2enum->get_int(lang_name));
82: if(!lang)
1.53 parser 83: throw Exception(0, 0,
1.3 paf 84: &lang_name,
85: "invalid taint language");
1.1 paf 86: }
87:
88: {
1.34 parser 89: Value& vbody=params->as_no_junction(params->size()-1, "body must not be code");
1.1 paf 90:
91: String result(r.pool());
92: result.append(
93: vbody.as_string(), // process marking tainted with that lang
94: lang, true); // force result language to specified
95: r.write_pass_lang(result);
96: }
97: }
98:
1.5 paf 99: static void _process(Request& r, const String& method_name, MethodParams *params) {
1.1 paf 100: // calculate pseudo file name of processed chars
101: // would be something like "/some/file(4) process"
102: char place[MAX_STRING];
103: #ifndef NO_STRING_ORIGIN
104: const Origin& origin=method_name.origin();
105: snprintf(place, MAX_STRING, "%s(%d) %s",
106: origin.file, 1+origin.line,
107: method_name.cstr());
108: #else
1.39 parser 109: strncpy(place, method_name.cstr(), MAX_STRING-1); place[MAX_STRING-1]=0;
1.1 paf 110: #endif
111:
112: VStateless_class& self_class=*r.self->get_class();
113: {
114: // temporary zero @main so to maybe-replace it in processed code
115: Temp_method temp_method_main(self_class, *main_method_name, 0);
116: // temporary zero @auto so it wouldn't be auto-called in Request::use_buf
117: Temp_method temp_method_auto(self_class, *auto_method_name, 0);
118:
119: // evaluate source to process
120: const String& source=
1.48 parser 121: r.process(params->as_no_junction(0, "body must be string")).as_string();
1.1 paf 122:
123: // process source code, append processed methods to 'self' class
124: // maybe-define new @main
125: r.use_buf(source.cstr(), place, &self_class);
126:
127: // maybe-execute @main[]
128: if(const Method *method=self_class.get_method(*main_method_name)) {
129: // execute!
130: r.execute(*method->parser_code);
131: }
132: }
133: }
134:
1.5 paf 135: static void _rem(Request& r, const String&, MethodParams *params) {
1.34 parser 136: params->as_junction(0, "body must be code");
1.1 paf 137: }
138:
1.5 paf 139: static void _while(Request& r, const String& method_name, MethodParams *params) {
1.1 paf 140: Pool& pool=r.pool();
141:
1.34 parser 142: Value& vcondition=params->as_junction(0, "condition must be expression");
143: Value& body=params->as_junction(1, "body must be code");
1.1 paf 144:
145: // while...
146: int endless_loop_count=0;
147: while(true) {
1.18 parser 148: if(++endless_loop_count>=MAX_LOOPS) // endless loop?
1.53 parser 149: throw Exception(0, 0,
1.1 paf 150: &method_name,
151: "endless loop detected");
152:
153: bool condition=
154: r.process(
155: vcondition,
156: 0/*no name*/,
157: false/*don't intercept string*/).as_bool();
158: if(!condition) // ...condition is true
159: break;
160:
161: // write processed body
162: r.write_pass_lang(r.process(body));
163: }
164: }
165:
1.5 paf 166: static void _use(Request& r, const String& method_name, MethodParams *params) {
1.34 parser 167: Value& vfile=params->as_no_junction(0, "file name must not be code");
1.37 parser 168: r.use_file(vfile.as_string());
1.1 paf 169: }
170:
1.5 paf 171: static void _for(Request& r, const String& method_name, MethodParams *params) {
1.1 paf 172: Pool& pool=r.pool();
1.48 parser 173: const String& var_name=params->as_string(0, "var name must be string");
174: int from=params->as_int(1, "from must be int", r);
175: int to=params->as_int(2, "to must be int", r);
1.34 parser 176: Value& body_code=params->as_junction(3, "body must be code");
1.50 parser 177: Value *delim_maybe_code=params->size()>4?¶ms->get(4):0;
1.1 paf 178:
179: bool need_delim=false;
180: VInt *vint=new(pool) VInt(pool, 0);
181: int endless_loop_count=0;
1.54 ! paf 182: Value& var_context=*body_code.get_junction()->wcontext;
1.1 paf 183: for(int i=from; i<=to; i++) {
1.18 parser 184: if(++endless_loop_count>=MAX_LOOPS) // endless loop?
1.53 parser 185: throw Exception(0, 0,
1.1 paf 186: &method_name,
187: "endless loop detected");
188: vint->set_int(i);
1.54 ! paf 189: var_context.put_element(var_name, vint);
1.1 paf 190:
191: Value& processed_body=r.process(body_code);
1.49 parser 192: if(delim_maybe_code) { // delimiter set?
1.1 paf 193: const String *string=processed_body.get_string();
194: if(need_delim && string && string->size()) // need delim & iteration produced string?
1.49 parser 195: r.write_pass_lang(r.process(*delim_maybe_code));
1.1 paf 196: need_delim=true;
197: }
198: r.write_pass_lang(processed_body);
199: }
200: }
201:
1.15 paf 202: static void _eval(Request& r, const String& method_name, MethodParams *params) {
1.34 parser 203: Value& expr=params->as_junction(0, "need expression");
1.1 paf 204: // evaluate expresion
205: Value *result=r.process(expr,
1.16 paf 206: 0/*no name YET*/,
1.1 paf 207: true/*don't intercept string*/).as_expr_result();
1.50 parser 208: if(params->size()>1) {
1.34 parser 209: Value& fmt=params->as_no_junction(1, "fmt must not be code");
1.1 paf 210:
211: Pool& pool=r.pool();
212: String& string=*new(pool) String(pool);
213: string.APPEND_CONST(format(pool, result->as_double(), fmt.as_string().cstr()));
214: result=new(pool) VString(string);
215: }
1.16 paf 216: result->set_name(method_name);
1.1 paf 217: r.write_no_lang(*result);
218: }
219:
1.52 parser 220: static void _error(Request& r, const String& method_name, MethodParams *params) {
221: Pool& pool=r.pool();
222:
223: const String& serror=params->as_string(0, "message must be string");
1.53 parser 224: throw Exception(0, 0,
1.52 parser 225: &method_name,
226: "%s", serror.cstr());
227: }
228:
1.1 paf 229:
1.53 parser 230: /// @todo rewrite ugly code with try/try to autoobject TempConnection
1.42 parser 231: static void _connect(Request& r, const String& method_name, MethodParams *params) {
1.1 paf 232: Pool& pool=r.pool();
233:
1.34 parser 234: Value& url=params->as_no_junction(0, "url must not be code");
235: Value& body_code=params->as_junction(1, "body must be code");
1.1 paf 236:
1.19 parser 237: Table *protocol2driver_and_client=
1.35 parser 238: static_cast<Table *>(r.classes_conf.get(r.OP.name()));
1.11 paf 239:
1.1 paf 240: // connect
241: SQL_Connection& connection=SQL_driver_manager->get_connection(
1.42 parser 242: url.as_string(), method_name, protocol2driver_and_client);
1.1 paf 243:
244: // remember/set current connection
245: SQL_Connection *saved_connection=r.connection;
246: r.connection=&connection;
247: // execute body
1.53 parser 248: try {
249: try {
250: r.write_assign_lang(r.process(body_code));
251:
252: connection.commit();
253: } catch(...) { // process/commit problem
254: connection.rollback();
255:
256: /*re*/throw;
257: }
258:
259: } catch(...) {
260: // close connection [cache it]
261: connection.close();
262: // recall current connection from remembered
263: r.connection=saved_connection;
1.1 paf 264:
1.53 parser 265: /*re*/throw;
1.1 paf 266: }
267:
1.53 parser 268: // and anyway
1.1 paf 269: // close connection [cache it]
1.21 parser 270: connection.close();
1.1 paf 271: // recall current connection from remembered
272: r.connection=saved_connection;
273: }
274:
1.41 parser 275: #ifndef DOXYGEN
1.28 parser 276: struct Switch_data {
277: Value *searching;
278: Value *found;
279: Value *_default;
280: };
1.41 parser 281: #endif
1.28 parser 282: static void _switch(Request& r, const String&, MethodParams *params) {
283: void *backup=r.classes_conf.get(*switch_data_name);
284: Switch_data data={&r.process(params->get(0))};
285: r.classes_conf.put(*switch_data_name, &data);
286:
1.34 parser 287: r.process(params->as_junction(1, "switch cases must be code")); // and ignore result
1.28 parser 288:
289: r.classes_conf.put(*switch_data_name, backup);
290:
291: if(Value *code=data.found ? data.found : data._default)
292: r.write_pass_lang(r.process(*code));
293: }
294:
1.38 parser 295: static void _case(Request& r, const String& method_name, MethodParams *params) {
296: Pool& pool=r.pool();
297:
298: Switch_data *data=static_cast<Switch_data *>(r.classes_conf.get(*switch_data_name));
299: if(!data)
1.53 parser 300: throw Exception(0, 0,
1.38 parser 301: &method_name,
302: "without switch");
1.28 parser 303:
304: int count=params->size();
1.34 parser 305: Value *code=¶ms->as_junction(--count, "case result must be code");
1.28 parser 306: for(int i=0; i<count; i++) {
307: Value& value=r.process(params->get(i));
308:
1.36 parser 309: if(value.as_string() == *case_default_value) {
1.38 parser 310: data->_default=code;
1.28 parser 311: break;
312: }
313:
314: bool matches;
1.38 parser 315: if(data->searching->is_string())
316: matches=data->searching->as_string() == value.as_string();
1.28 parser 317: else
1.38 parser 318: matches=data->searching->as_double() == value.as_double();
1.28 parser 319:
320: if(matches) {
1.38 parser 321: data->found=code;
1.28 parser 322: break;
323: }
324: }
325: }
326:
1.10 paf 327: // constructor
328:
1.11 paf 329: MOP::MOP(Pool& apool) : Methoded(apool),
330: main_sql_name(apool, MAIN_SQL_NAME),
331: main_sql_drivers_name(apool, MAIN_SQL_DRIVERS_NAME)
332: {
1.10 paf 333: set_name(*NEW String(pool(), OP_CLASS_NAME));
1.28 parser 334:
1.1 paf 335: // ^if(condition){code-when-true}
336: // ^if(condition){code-when-true}{code-when-false}
1.10 paf 337: add_native_method("if", Method::CT_ANY, _if, 2, 3);
1.1 paf 338:
339: // ^untaint[as-is|uri|sql|js|html|html-typo]{code}
1.10 paf 340: add_native_method("untaint", Method::CT_ANY, _untaint, 2, 2);
1.1 paf 341:
342: // ^taint[as-is|uri|sql|js|html|html-typo]{code}
1.10 paf 343: add_native_method("taint", Method::CT_ANY, _taint, 1, 2);
1.1 paf 344:
345: // ^process[code]
1.10 paf 346: add_native_method("process", Method::CT_ANY, _process, 1, 1);
1.1 paf 347:
348: // ^rem{code}
1.51 parser 349: add_native_method("rem", Method::CT_ANY, _rem, 1, 10000);
1.1 paf 350:
351: // ^while(condition){code}
1.10 paf 352: add_native_method("while", Method::CT_ANY, _while, 2, 2);
1.1 paf 353:
354: // ^use[file]
1.10 paf 355: add_native_method("use", Method::CT_ANY, _use, 1, 1);
1.1 paf 356:
1.54 ! paf 357: // ^for[i](from-number;to-number-inclusive){code}[delim]
1.10 paf 358: add_native_method("for", Method::CT_ANY, _for, 3+1, 3+1+1);
1.1 paf 359:
360: // ^eval(expr)
361: // ^eval(expr)[format]
1.10 paf 362: add_native_method("eval", Method::CT_ANY, _eval, 1, 2);
1.52 parser 363:
364: // ^error[msg]
365: add_native_method("error", Method::CT_ANY, _error, 1, 1);
1.32 parser 366:
1.1 paf 367:
368: // ^connect[protocol://user:pass@host[:port]/database]{code with ^sql-s}
1.10 paf 369: add_native_method("connect", Method::CT_ANY, _connect, 2, 2);
370:
1.28 parser 371: // switch
372:
373: // ^switch[value]{cases}
374: add_native_method("switch", Method::CT_ANY, _switch, 2, 2);
375:
376: // ^case[value]{code}
1.51 parser 377: add_native_method("case", Method::CT_ANY, _case, 2, 10000);
1.10 paf 378: }
1.11 paf 379:
380: // constructor & configurator
1.1 paf 381:
1.10 paf 382: Methoded *MOP_create(Pool& pool) {
1.35 parser 383: return new(pool) MOP(pool);
1.11 paf 384: }
385:
386: void MOP::configure_user(Request& r) {
387: Pool& pool=r.pool();
388:
389: // $MAIN:SQL.drivers
390: if(Value *sql=r.main_class->get_element(main_sql_name))
391: if(Value *element=sql->get_element(main_sql_drivers_name))
392: if(Table *protocol2library=element->get_table())
393: r.classes_conf.put(name(), protocol2library);
1.1 paf 394: }
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