Annotation of parser3/src/classes/op.C, revision 1.14
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)
5:
6: Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
7:
1.14 ! paf 8: $Id: op.C,v 1.13 2001/04/28 15:22:39 paf Exp $
1.1 paf 9: */
10:
1.13 paf 11: #include "classes.h"
1.1 paf 12: #include "pa_config_includes.h"
13: #include "pa_common.h"
14: #include "pa_request.h"
15: #include "pa_vint.h"
16: #include "pa_sql_connection.h"
17:
1.10 paf 18: // defines
19:
20: #define OP_CLASS_NAME "OP"
21:
1.11 paf 22: #define MAIN_SQL_NAME "SQL"
23: #define MAIN_SQL_DRIVERS_NAME "drivers"
24:
25: // local variable
26:
27: static Methoded *OP;
28:
1.10 paf 29: // class
30:
31: class MOP : public Methoded {
32: public:
33: MOP(Pool& pool);
1.11 paf 34: public: // Methoded
1.10 paf 35: bool used_directly() { return true; }
1.11 paf 36: void configure_user(Request& r);
37: private:
38: String main_sql_name;
39: String main_sql_drivers_name;
1.10 paf 40: };
41:
42: // methods
43:
1.5 paf 44: static void _if(Request& r, const String&, MethodParams *params) {
45: Value& condition_code=params->get(0);
1.1 paf 46:
47: bool condition=r.process(condition_code,
48: 0/*no name*/,
49: false/*don't intercept string*/).as_bool();
1.6 paf 50: if(condition)
1.5 paf 51: r.write_pass_lang(r.process(params->get(1)));
1.6 paf 52: else if(params->size()==3)
1.5 paf 53: r.write_pass_lang(r.process(params->get(2)));
1.1 paf 54: }
55:
1.5 paf 56: static void _untaint(Request& r, const String& method_name, MethodParams *params) {
1.1 paf 57: Pool& pool=r.pool();
58:
1.5 paf 59: const String& lang_name=r.process(params->get(0)).as_string();
1.1 paf 60: String::Untaint_lang lang=static_cast<String::Untaint_lang>(
61: untaint_lang_name2enum->get_int(lang_name));
62: if(!lang)
63: PTHROW(0, 0,
64: &lang_name,
65: "invalid untaint language");
66:
67: {
1.5 paf 68: Value& vbody=params->get_junction(1, "body must be code");
1.1 paf 69:
70: Temp_lang temp_lang(r, lang); // set temporarily specified ^untaint[language;
1.5 paf 71: r.write_pass_lang(r.process(vbody)); // process marking tainted with that lang
1.1 paf 72: }
73: }
74:
1.5 paf 75: static void _taint(Request& r, const String&, MethodParams *params) {
1.1 paf 76: Pool& pool=r.pool();
77:
78: String::Untaint_lang lang;
79: if(params->size()==1)
80: lang=String::UL_TAINTED; // mark as simply 'tainted'. useful in table:set
81: else {
1.3 paf 82: const String& lang_name=
1.5 paf 83: r.process(params->get(0)).as_string();
1.1 paf 84: lang=static_cast<String::Untaint_lang>(
85: untaint_lang_name2enum->get_int(lang_name));
86: if(!lang)
87: PTHROW(0, 0,
1.3 paf 88: &lang_name,
89: "invalid taint language");
1.1 paf 90: }
91:
92: {
1.5 paf 93: Value& vbody=params->get_no_junction(params->size()-1, "body must not be code");
1.1 paf 94:
95: String result(r.pool());
96: result.append(
97: vbody.as_string(), // process marking tainted with that lang
98: lang, true); // force result language to specified
99: r.write_pass_lang(result);
100: }
101: }
102:
1.5 paf 103: static void _process(Request& r, const String& method_name, MethodParams *params) {
1.1 paf 104: // calculate pseudo file name of processed chars
105: // would be something like "/some/file(4) process"
106: char place[MAX_STRING];
107: #ifndef NO_STRING_ORIGIN
108: const Origin& origin=method_name.origin();
109: snprintf(place, MAX_STRING, "%s(%d) %s",
110: origin.file, 1+origin.line,
111: method_name.cstr());
112: #else
113: strncpy(place, MAX_STRING, method_name.cstr());
114: #endif
115:
116: VStateless_class& self_class=*r.self->get_class();
117: {
118: // temporary zero @main so to maybe-replace it in processed code
119: Temp_method temp_method_main(self_class, *main_method_name, 0);
120: // temporary zero @auto so it wouldn't be auto-called in Request::use_buf
121: Temp_method temp_method_auto(self_class, *auto_method_name, 0);
122:
123: // evaluate source to process
124: const String& source=
1.5 paf 125: r.process(params->get(0)).as_string();
1.1 paf 126:
127: // process source code, append processed methods to 'self' class
128: // maybe-define new @main
129: r.use_buf(source.cstr(), place, &self_class);
130:
131: // maybe-execute @main[]
132: if(const Method *method=self_class.get_method(*main_method_name)) {
133: // execute!
134: r.execute(*method->parser_code);
135: }
136: }
137: }
138:
1.5 paf 139: static void _rem(Request& r, const String&, MethodParams *params) {
140: params->get_junction(0, "body must be code");
1.1 paf 141: }
142:
1.5 paf 143: static void _while(Request& r, const String& method_name, MethodParams *params) {
1.1 paf 144: Pool& pool=r.pool();
145:
1.5 paf 146: Value& vcondition=params->get_junction(0, "condition must be expression");
147: Value& body=params->get_junction(1, "body must be code");
1.1 paf 148:
149: // while...
150: int endless_loop_count=0;
151: while(true) {
152: if(++endless_loop_count>=1973) // endless loop?
153: PTHROW(0, 0,
154: &method_name,
155: "endless loop detected");
156:
157: bool condition=
158: r.process(
159: vcondition,
160: 0/*no name*/,
161: false/*don't intercept string*/).as_bool();
162: if(!condition) // ...condition is true
163: break;
164:
165: // write processed body
166: r.write_pass_lang(r.process(body));
167: }
168: }
169:
1.5 paf 170: static void _use(Request& r, const String& method_name, MethodParams *params) {
171: Value& vfile=params->get_no_junction(0, "file name must not be code");
1.1 paf 172: r.use_file(r.absolute(vfile.as_string()));
173: }
174:
1.5 paf 175: static void _for(Request& r, const String& method_name, MethodParams *params) {
1.1 paf 176: Pool& pool=r.pool();
1.5 paf 177: const String& var_name=r.process(params->get(0)).as_string();
178: int from=(int)r.process(params->get(1)).as_double();
179: int to=(int)r.process(params->get(2)).as_double();
180: Value& body_code=params->get_junction(3, "body must be code");
181: Value *delim_code=params->size()==3+1+1?¶ms->get(3+1):0;
1.1 paf 182:
183: bool need_delim=false;
184: VInt *vint=new(pool) VInt(pool, 0);
185: int endless_loop_count=0;
186: for(int i=from; i<=to; i++) {
187: if(++endless_loop_count>=2001) // endless loop?
188: PTHROW(0, 0,
189: &method_name,
190: "endless loop detected");
191: vint->set_int(i);
1.4 paf 192: r.root->put_element(var_name, vint);
1.1 paf 193:
194: Value& processed_body=r.process(body_code);
195: if(delim_code) { // delimiter set?
196: const String *string=processed_body.get_string();
197: if(need_delim && string && string->size()) // need delim & iteration produced string?
198: r.write_pass_lang(r.process(*delim_code));
199: need_delim=true;
200: }
201: r.write_pass_lang(processed_body);
202: }
203: }
204:
1.5 paf 205: static void _eval(Request& r, const String&, MethodParams *params) {
206: Value& expr=params->get_junction(0, "need expression");
1.1 paf 207: // evaluate expresion
208: Value *result=r.process(expr,
209: 0/*no name*/,
210: true/*don't intercept string*/).as_expr_result();
211: if(params->size()==2) {
1.5 paf 212: Value& fmt=params->get_no_junction(1, "fmt must not be code");
1.1 paf 213:
214: Pool& pool=r.pool();
215: String& string=*new(pool) String(pool);
216: string.APPEND_CONST(format(pool, result->as_double(), fmt.as_string().cstr()));
217: result=new(pool) VString(string);
218: }
219: r.write_no_lang(*result);
220: }
221:
222:
223: typedef double (*math_one_double_op_func_ptr)(double);
224: static double round(double op) { return floor(op+0.5); }
225: static double sign(double op) { return op > 0 ? 1 : ( op < 0 ? -1 : 0 ); }
226:
227: static void double_one_op(
228: Request& r,
1.5 paf 229: const String& method_name, MethodParams *params,
1.1 paf 230: math_one_double_op_func_ptr func) {
231: Pool& pool=r.pool();
1.5 paf 232: Value& param=params->get_junction(0, "parameter must be expression");
1.1 paf 233:
234: Value& result=*new(pool) VDouble(pool, (*func)(r.process(param).as_double()));
235: r.write_no_lang(result);
236: }
237:
1.5 paf 238: static void _round(Request& r, const String& method_name, MethodParams *params) {
1.1 paf 239: double_one_op(r, method_name, params, &round);
240: }
241:
1.5 paf 242: static void _floor(Request& r, const String& method_name, MethodParams *params) {
1.1 paf 243: double_one_op(r, method_name, params, &floor);
244: }
245:
1.5 paf 246: static void _ceiling(Request& r, const String& method_name, MethodParams *params) {
1.1 paf 247: double_one_op(r, method_name, params, &ceil);
248: }
249:
1.5 paf 250: static void _abs(Request& r, const String& method_name, MethodParams *params) {
1.1 paf 251: double_one_op(r, method_name, params, &fabs);
252: }
253:
1.5 paf 254: static void _sign(Request& r, const String& method_name, MethodParams *params) {
1.1 paf 255: double_one_op(r, method_name, params, &sign);
256: }
257:
1.5 paf 258: static void _connect(Request& r, const String&, MethodParams *params) {
1.1 paf 259: Pool& pool=r.pool();
260:
1.5 paf 261: Value& url=params->get_no_junction(0, "url must not be code");
262: Value& body_code=params->get_junction(1, "body must be code");
1.1 paf 263:
1.11 paf 264: Table *protocol2library=static_cast<Table *>(r.classes_conf.get(OP->name()));
265:
1.1 paf 266: // connect
267: SQL_Connection& connection=SQL_driver_manager->get_connection(
1.11 paf 268: url.as_string(), protocol2library);
1.1 paf 269:
270: Exception rethrow_me;
271: // remember/set current connection
272: SQL_Connection *saved_connection=r.connection;
273: r.connection=&connection;
274: // execute body
275: bool body_failed=false;
276: PTRY
277: r.write_assign_lang(r.process(body_code));
278: PCATCH(e) { // connect/process problem
279: rethrow_me=e; body_failed=true;
280: }
281: PEND_CATCH
282:
283: bool finalizer_failed=false;
284: PTRY
285: // FINALLY
286: if(body_failed)
287: connection.rollback();
288: else
289: connection.commit();
290: PCATCH(e) { // commit/rollback problem
291: rethrow_me=e; finalizer_failed=true;
292: }
293: PEND_CATCH
294:
295: // close connection [cache it]
296: connection.close();
297: // recall current connection from remembered
298: r.connection=saved_connection;
299:
300: if(body_failed || finalizer_failed) // were there an exception for us to rethrow?
301: PTHROW(rethrow_me.type(), rethrow_me.code(),
302: rethrow_me.problem_source(),
303: rethrow_me.comment());
304: }
305:
1.10 paf 306: // constructor
307:
1.11 paf 308: MOP::MOP(Pool& apool) : Methoded(apool),
309: main_sql_name(apool, MAIN_SQL_NAME),
310: main_sql_drivers_name(apool, MAIN_SQL_DRIVERS_NAME)
311: {
1.10 paf 312: set_name(*NEW String(pool(), OP_CLASS_NAME));
1.1 paf 313:
314: // ^if(condition){code-when-true}
315: // ^if(condition){code-when-true}{code-when-false}
1.10 paf 316: add_native_method("if", Method::CT_ANY, _if, 2, 3);
1.1 paf 317:
318: // ^untaint[as-is|uri|sql|js|html|html-typo]{code}
1.10 paf 319: add_native_method("untaint", Method::CT_ANY, _untaint, 2, 2);
1.1 paf 320:
321: // ^taint[as-is|uri|sql|js|html|html-typo]{code}
1.10 paf 322: add_native_method("taint", Method::CT_ANY, _taint, 1, 2);
1.1 paf 323:
324: // ^process[code]
1.10 paf 325: add_native_method("process", Method::CT_ANY, _process, 1, 1);
1.1 paf 326:
327: // ^rem{code}
1.10 paf 328: add_native_method("rem", Method::CT_ANY, _rem, 1, 1);
1.1 paf 329:
330: // ^while(condition){code}
1.10 paf 331: add_native_method("while", Method::CT_ANY, _while, 2, 2);
1.1 paf 332:
333: // ^use[file]
1.10 paf 334: add_native_method("use", Method::CT_ANY, _use, 1, 1);
1.1 paf 335:
336: // ^for[i;from-number;to-number-inclusive]{code}[delim]
1.10 paf 337: add_native_method("for", Method::CT_ANY, _for, 3+1, 3+1+1);
1.1 paf 338:
339: // ^eval(expr)
340: // ^eval(expr)[format]
1.10 paf 341: add_native_method("eval", Method::CT_ANY, _eval, 1, 2);
1.1 paf 342:
343:
344: // math functions
345:
346: // ^round(expr)
1.10 paf 347: add_native_method("round", Method::CT_ANY, _round, 1, 1);
1.1 paf 348:
349: // ^floor(expr)
1.10 paf 350: add_native_method("floor", Method::CT_ANY, _floor, 1, 1);
1.1 paf 351:
352: // ^ceiling(expr)
1.10 paf 353: add_native_method("ceiling", Method::CT_ANY, _ceiling, 1, 1);
1.1 paf 354:
355: // ^abs(expr)
1.10 paf 356: add_native_method("abs", Method::CT_ANY, _abs, 1, 1);
1.1 paf 357:
358: // ^sign(expr)
1.10 paf 359: add_native_method("sign", Method::CT_ANY, _sign, 1, 1);
1.1 paf 360:
361:
362: // connect
363:
364: // ^connect[protocol://user:pass@host[:port]/database]{code with ^sql-s}
1.10 paf 365: add_native_method("connect", Method::CT_ANY, _connect, 2, 2);
366:
367: }
1.11 paf 368:
369: // constructor & configurator
1.1 paf 370:
1.10 paf 371: Methoded *MOP_create(Pool& pool) {
1.11 paf 372: return OP=new(pool) MOP(pool);
373: }
374:
375:
376: void MOP::configure_user(Request& r) {
377: Pool& pool=r.pool();
378:
379: // $MAIN:SQL.drivers
380: if(Value *sql=r.main_class->get_element(main_sql_name))
381: if(Value *element=sql->get_element(main_sql_drivers_name))
382: if(Table *protocol2library=element->get_table())
383: r.classes_conf.put(name(), protocol2library);
1.1 paf 384: }
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