Annotation of parser3/src/classes/op.C, revision 1.49
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:
1.49 ! parser 7: $Id: op.C,v 1.48 2001/10/09 07:06:00 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")));
1.6 paf 49: else if(params->size()==3)
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)
60: PTHROW(0, 0,
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)
83: PTHROW(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?
1.1 paf 149: PTHROW(0, 0,
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");
1.49 ! parser 177: Value *delim_maybe_code=params->size()==3+1+1?¶ms->get(3+1):0;
1.1 paf 178:
179: bool need_delim=false;
180: VInt *vint=new(pool) VInt(pool, 0);
181: int endless_loop_count=0;
182: for(int i=from; i<=to; i++) {
1.18 parser 183: if(++endless_loop_count>=MAX_LOOPS) // endless loop?
1.1 paf 184: PTHROW(0, 0,
185: &method_name,
186: "endless loop detected");
187: vint->set_int(i);
1.42 parser 188: r.self/*root*/->put_element(var_name, vint);
1.1 paf 189:
190: Value& processed_body=r.process(body_code);
1.49 ! parser 191: if(delim_maybe_code) { // delimiter set?
1.1 paf 192: const String *string=processed_body.get_string();
193: if(need_delim && string && string->size()) // need delim & iteration produced string?
1.49 ! parser 194: r.write_pass_lang(r.process(*delim_maybe_code));
1.1 paf 195: need_delim=true;
196: }
197: r.write_pass_lang(processed_body);
198: }
199: }
200:
1.15 paf 201: static void _eval(Request& r, const String& method_name, MethodParams *params) {
1.34 parser 202: Value& expr=params->as_junction(0, "need expression");
1.1 paf 203: // evaluate expresion
204: Value *result=r.process(expr,
1.16 paf 205: 0/*no name YET*/,
1.1 paf 206: true/*don't intercept string*/).as_expr_result();
207: if(params->size()==2) {
1.34 parser 208: Value& fmt=params->as_no_junction(1, "fmt must not be code");
1.1 paf 209:
210: Pool& pool=r.pool();
211: String& string=*new(pool) String(pool);
212: string.APPEND_CONST(format(pool, result->as_double(), fmt.as_string().cstr()));
213: result=new(pool) VString(string);
214: }
1.16 paf 215: result->set_name(method_name);
1.1 paf 216: r.write_no_lang(*result);
217: }
218:
219:
1.42 parser 220: static void _connect(Request& r, const String& method_name, MethodParams *params) {
1.1 paf 221: Pool& pool=r.pool();
222:
1.34 parser 223: Value& url=params->as_no_junction(0, "url must not be code");
224: Value& body_code=params->as_junction(1, "body must be code");
1.1 paf 225:
1.19 parser 226: Table *protocol2driver_and_client=
1.35 parser 227: static_cast<Table *>(r.classes_conf.get(r.OP.name()));
1.11 paf 228:
1.1 paf 229: // connect
230: SQL_Connection& connection=SQL_driver_manager->get_connection(
1.42 parser 231: url.as_string(), method_name, protocol2driver_and_client);
1.1 paf 232:
233: Exception rethrow_me;
234: // remember/set current connection
235: SQL_Connection *saved_connection=r.connection;
236: r.connection=&connection;
237: // execute body
238: bool body_failed=false;
239: PTRY
240: r.write_assign_lang(r.process(body_code));
241: PCATCH(e) { // connect/process problem
242: rethrow_me=e; body_failed=true;
243: }
244: PEND_CATCH
245:
246: bool finalizer_failed=false;
247: PTRY
248: // FINALLY
249: if(body_failed)
250: connection.rollback();
251: else
252: connection.commit();
253: PCATCH(e) { // commit/rollback problem
254: rethrow_me=e; finalizer_failed=true;
255: }
256: PEND_CATCH
257:
258: // close connection [cache it]
1.21 parser 259: connection.close();
1.1 paf 260: // recall current connection from remembered
261: r.connection=saved_connection;
262:
263: if(body_failed || finalizer_failed) // were there an exception for us to rethrow?
264: PTHROW(rethrow_me.type(), rethrow_me.code(),
265: rethrow_me.problem_source(),
266: rethrow_me.comment());
267: }
268:
1.41 parser 269: #ifndef DOXYGEN
1.28 parser 270: struct Switch_data {
271: Value *searching;
272: Value *found;
273: Value *_default;
274: };
1.41 parser 275: #endif
1.28 parser 276: static void _switch(Request& r, const String&, MethodParams *params) {
277: void *backup=r.classes_conf.get(*switch_data_name);
278: Switch_data data={&r.process(params->get(0))};
279: r.classes_conf.put(*switch_data_name, &data);
280:
1.34 parser 281: r.process(params->as_junction(1, "switch cases must be code")); // and ignore result
1.28 parser 282:
283: r.classes_conf.put(*switch_data_name, backup);
284:
285: if(Value *code=data.found ? data.found : data._default)
286: r.write_pass_lang(r.process(*code));
287: }
288:
1.38 parser 289: static void _case(Request& r, const String& method_name, MethodParams *params) {
290: Pool& pool=r.pool();
291:
292: Switch_data *data=static_cast<Switch_data *>(r.classes_conf.get(*switch_data_name));
293: if(!data)
294: PTHROW(0, 0,
295: &method_name,
296: "without switch");
1.28 parser 297:
298: int count=params->size();
1.34 parser 299: Value *code=¶ms->as_junction(--count, "case result must be code");
1.28 parser 300: for(int i=0; i<count; i++) {
301: Value& value=r.process(params->get(i));
302:
1.36 parser 303: if(value.as_string() == *case_default_value) {
1.38 parser 304: data->_default=code;
1.28 parser 305: break;
306: }
307:
308: bool matches;
1.38 parser 309: if(data->searching->is_string())
310: matches=data->searching->as_string() == value.as_string();
1.28 parser 311: else
1.38 parser 312: matches=data->searching->as_double() == value.as_double();
1.28 parser 313:
314: if(matches) {
1.38 parser 315: data->found=code;
1.28 parser 316: break;
317: }
318: }
319: }
320:
1.10 paf 321: // constructor
322:
1.11 paf 323: MOP::MOP(Pool& apool) : Methoded(apool),
324: main_sql_name(apool, MAIN_SQL_NAME),
325: main_sql_drivers_name(apool, MAIN_SQL_DRIVERS_NAME)
326: {
1.10 paf 327: set_name(*NEW String(pool(), OP_CLASS_NAME));
1.28 parser 328:
1.1 paf 329: // ^if(condition){code-when-true}
330: // ^if(condition){code-when-true}{code-when-false}
1.10 paf 331: add_native_method("if", Method::CT_ANY, _if, 2, 3);
1.1 paf 332:
333: // ^untaint[as-is|uri|sql|js|html|html-typo]{code}
1.10 paf 334: add_native_method("untaint", Method::CT_ANY, _untaint, 2, 2);
1.1 paf 335:
336: // ^taint[as-is|uri|sql|js|html|html-typo]{code}
1.10 paf 337: add_native_method("taint", Method::CT_ANY, _taint, 1, 2);
1.1 paf 338:
339: // ^process[code]
1.10 paf 340: add_native_method("process", Method::CT_ANY, _process, 1, 1);
1.1 paf 341:
342: // ^rem{code}
1.26 parser 343: add_native_method("rem", Method::CT_ANY, _rem, 1, 1000);
1.1 paf 344:
345: // ^while(condition){code}
1.10 paf 346: add_native_method("while", Method::CT_ANY, _while, 2, 2);
1.1 paf 347:
348: // ^use[file]
1.10 paf 349: add_native_method("use", Method::CT_ANY, _use, 1, 1);
1.1 paf 350:
351: // ^for[i;from-number;to-number-inclusive]{code}[delim]
1.10 paf 352: add_native_method("for", Method::CT_ANY, _for, 3+1, 3+1+1);
1.1 paf 353:
354: // ^eval(expr)
355: // ^eval(expr)[format]
1.10 paf 356: add_native_method("eval", Method::CT_ANY, _eval, 1, 2);
1.32 parser 357:
1.1 paf 358:
359: // ^connect[protocol://user:pass@host[:port]/database]{code with ^sql-s}
1.10 paf 360: add_native_method("connect", Method::CT_ANY, _connect, 2, 2);
361:
1.28 parser 362: // switch
363:
364: // ^switch[value]{cases}
365: add_native_method("switch", Method::CT_ANY, _switch, 2, 2);
366:
367: // ^case[value]{code}
368: add_native_method("case", Method::CT_ANY, _case, 2, 1000);
1.10 paf 369: }
1.11 paf 370:
371: // constructor & configurator
1.1 paf 372:
1.10 paf 373: Methoded *MOP_create(Pool& pool) {
1.35 parser 374: return new(pool) MOP(pool);
1.11 paf 375: }
376:
377: void MOP::configure_user(Request& r) {
378: Pool& pool=r.pool();
379:
380: // $MAIN:SQL.drivers
381: if(Value *sql=r.main_class->get_element(main_sql_name))
382: if(Value *element=sql->get_element(main_sql_drivers_name))
383: if(Table *protocol2library=element->get_table())
384: r.classes_conf.put(name(), protocol2library);
1.1 paf 385: }
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