Annotation of parser3/src/classes/hash.C, revision 1.68
1.1 paf 1: /** @file
2: Parser: @b hash parser class.
3:
1.65 paf 4: Copyright (c) 2001-2004 ArtLebedev Group (http://www.artlebedev.com)
1.35 paf 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.41 paf 6: */
1.1 paf 7:
1.68 ! paf 8: static const char * const IDENT_HASH_C="$Date: 2004/02/25 13:42:14 $";
1.1 paf 9:
10: #include "classes.h"
1.57 paf 11: #include "pa_vmethod_frame.h"
12:
1.1 paf 13: #include "pa_request.h"
14: #include "pa_vhash.h"
1.6 parser 15: #include "pa_vvoid.h"
1.2 parser 16: #include "pa_sql_connection.h"
1.9 parser 17: #include "pa_vtable.h"
1.22 parser 18: #include "pa_vbool.h"
1.26 paf 19: #include "pa_vmethod_frame.h"
1.2 parser 20:
1.1 paf 21: // class
22:
1.57 paf 23: class MHash: public Methoded {
1.2 parser 24: public: // VStateless_class
1.61 paf 25: Value* create_new_value(Pool&) { return new VHash(); }
1.2 parser 26:
1.1 paf 27: public:
1.57 paf 28: MHash();
1.1 paf 29: public: // Methoded
1.2 parser 30: bool used_directly() { return true; }
1.1 paf 31: };
32:
1.57 paf 33: // global variable
34:
35: DECLARE_CLASS_VAR(hash, new MHash, 0);
36:
1.1 paf 37: // methods
38:
1.11 parser 39: #ifndef DOXYGEN
1.52 paf 40: class Hash_sql_event_handlers: public SQL_Driver_query_event_handlers {
1.57 paf 41: const String& statement_string; const char* statement_cstr;
42: bool distinct;
43: HashStringValue& rows_hash;
44: HashStringValue* row_hash;
45: int column_index;
46: ArrayString columns;
1.67 paf 47: bool only_one_column;
48: static VBool only_one_column_value;
1.11 parser 49: public:
1.57 paf 50: Hash_sql_event_handlers(
51: const String& astatement_string, const char* astatement_cstr,
1.49 paf 52: bool adistinct,
1.57 paf 53: HashStringValue& arows_hash):
54: statement_string(astatement_string), statement_cstr(astatement_cstr),
1.49 paf 55: distinct(adistinct),
1.11 parser 56: rows_hash(arows_hash),
1.57 paf 57: row_hash(0),
1.67 paf 58: column_index(0),
59: only_one_column(false) {
1.11 parser 60: }
1.57 paf 61: bool add_column(SQL_Error& error, const char* str, size_t length) {
1.53 paf 62: try {
1.57 paf 63: columns+=new String(str, length, true);
1.53 paf 64: return false;
65: } catch(...) {
66: error=SQL_Error("exception occured in Hash_sql_event_handlers::add_column");
67: return true;
68: }
1.11 parser 69: }
1.53 paf 70: bool before_rows(SQL_Error& error) {
1.67 paf 71: if(columns.count()<1) {
72: error=SQL_Error("parser.runtime", "no columns");
1.53 paf 73: return true;
74: }
1.67 paf 75: only_one_column=columns.count()==1;
1.53 paf 76:
77: return false;
1.11 parser 78: }
1.53 paf 79: bool add_row(SQL_Error& /*error*/) {
1.11 parser 80: column_index=0;
1.53 paf 81: return false;
1.11 parser 82: }
1.57 paf 83: bool add_row_cell(SQL_Error& error, const char *ptr, size_t length) {
1.53 paf 84: try {
1.57 paf 85: String& cell=*new String;
86: if(length)
87: cell.append_know_length(ptr, length, String::L_TAINTED);
1.53 paf 88: if(column_index==0) {
1.57 paf 89: VHash* row_vhash=new VHash;
90: row_hash=&row_vhash->hash();
91: if(rows_hash.put_dont_replace(cell, row_vhash)) // put. existed?
1.53 paf 92: if(!distinct) {
1.67 paf 93: error=SQL_Error("parser.runtime", "duplicate key");
1.53 paf 94: return true;
95: }
1.67 paf 96: if(only_one_column)
97: row_hash->put(cell, &only_one_column_value);
1.53 paf 98: } else
1.57 paf 99: row_hash->put(*columns[column_index], new VString(cell));
1.53 paf 100: column_index++;
101:
102: return false;
103: } catch(...) {
104: error=SQL_Error("exception occured in Hash_sql_event_handlers::add_row_cell");
105: return true;
106: }
1.11 parser 107: }
108:
109: };
1.67 paf 110: VBool Hash_sql_event_handlers::only_one_column_value(true);
111:
1.11 parser 112: #endif
113:
1.57 paf 114: static void copy_all_overwrite_to(
115: HashStringValue::key_type key,
116: HashStringValue::value_type value,
117: HashStringValue* dest) {
118: dest->put(key, value);
119: }
120: static void _create_or_add(Request& r, MethodParams& params) {
121: if(params.count()) {
1.66 paf 122: Value& vsrc=params.as_no_junction(0, "param must be hash");
123: if(HashStringValue* src=vsrc.get_hash()) {
124: HashStringValue* self=&(GET_SELF(r, VHash).hash());
125: if(src==self) // same: doing nothing
126: return;
127: src->for_each(copy_all_overwrite_to, self);
128: }
1.20 parser 129: }
130: }
1.22 parser 131:
1.57 paf 132: static void remove_key_from(
133: HashStringValue::key_type key,
134: HashStringValue::value_type /*value*/,
135: HashStringValue* dest) {
136: dest->remove(key);
137: }
138: static void _sub(Request& r, MethodParams& params) {
1.66 paf 139: Value& vsrc=params.as_no_junction(0, "param must be hash");
140: if(HashStringValue* src=vsrc.get_hash()) {
141: HashStringValue* self=&(GET_SELF(r, VHash).hash());
142: if(src==self) { // same: clearing
143: self->clear();
144: return;
145: }
146: src->for_each(remove_key_from, self);
147: }
1.57 paf 148: }
149:
150: static void copy_all_dontoverwrite_to(
151: HashStringValue::key_type key,
152: HashStringValue::value_type value,
153: HashStringValue* dest) {
154: dest->put_dont_replace(key, value);
1.22 parser 155: }
1.57 paf 156: static void _union(Request& r, MethodParams& params) {
1.22 parser 157: // dest = copy of self
1.57 paf 158: Value& result=*new VHash(GET_SELF(r, VHash).hash());
1.22 parser 159: // dest += b
1.66 paf 160: Value& vsrc=params.as_no_junction(0, "param must be hash");
161: if(HashStringValue* src=vsrc.get_hash())
162: src->for_each(copy_all_dontoverwrite_to, result.get_hash());
1.22 parser 163:
164: // return result
165: r.write_no_lang(result);
166: }
167:
168: #ifndef DOXYGEN
169: struct Copy_intersection_to_info {
1.57 paf 170: HashStringValue* b;
171: HashStringValue* dest;
1.22 parser 172: };
173: #endif
1.57 paf 174: static void copy_intersection_to(
175: HashStringValue::key_type key,
176: HashStringValue::value_type value,
177: Copy_intersection_to_info *info) {
178: if(info->b->get(key))
179: info->dest->put_dont_replace(key, value);
1.22 parser 180: }
1.57 paf 181: static void _intersection(Request& r, MethodParams& params) {
182: Value& result=*new VHash;
1.22 parser 183: // dest += b
1.57 paf 184: Value& vb=params.as_no_junction(0, "param must be hash");
185: if(HashStringValue* b=vb.get_hash()) {
186: Copy_intersection_to_info info={b, result.get_hash()};
187: GET_SELF(r, VHash).hash().for_each(copy_intersection_to, &info);
1.22 parser 188: }
189:
190: // return result
1.57 paf 191: r.write_no_lang(result);
1.22 parser 192: }
193:
1.57 paf 194: static bool intersects(
195: HashStringValue::key_type key,
196: HashStringValue::value_type /*value*/,
197: HashStringValue* b) {
198: return b->get(key)!=0;
1.22 parser 199: }
200:
1.57 paf 201: static void _intersects(Request& r, MethodParams& params) {
202: bool result=false;
203:
204: Value& vb=params.as_no_junction(0, "param must be hash");
205: if(HashStringValue* b=vb.get_hash())
206: result=GET_SELF(r, VHash).hash().first_that(intersects, b)!=0;
1.22 parser 207:
208: // return result
1.57 paf 209: r.write_no_lang(*new VBool(result));
1.22 parser 210: }
211:
212:
1.57 paf 213: extern String sql_limit_name;
214: extern String sql_offset_name;
215: extern String sql_default_name;
216: extern String sql_distinct_name;
217: static void _sql(Request& r, MethodParams& params) {
218: Value& statement=params.as_junction(0, "statement must be code");
1.2 parser 219:
220: ulong limit=0;
1.33 paf 221: ulong offset=0;
1.49 paf 222: bool distinct=false;
1.57 paf 223: if(params.count()>1) {
224: Value& voptions=params.as_no_junction(1, "options must be hash, not code");
1.43 paf 225: if(!voptions.is_string())
1.57 paf 226: if(HashStringValue* options=voptions.get_hash()) {
1.49 paf 227: int valid_options=0;
1.57 paf 228: if(Value* vlimit=options->get(sql_limit_name)) {
1.49 paf 229: valid_options++;
1.37 paf 230: limit=(ulong)r.process_to_value(*vlimit).as_double();
1.49 paf 231: }
1.57 paf 232: if(Value* voffset=options->get(sql_offset_name)) {
1.49 paf 233: valid_options++;
1.37 paf 234: offset=(ulong)r.process_to_value(*voffset).as_double();
1.49 paf 235: }
1.57 paf 236: if(Value* vdistinct=options->get(sql_distinct_name)) {
1.49 paf 237: valid_options++;
238: distinct=r.process_to_value(*vdistinct).as_bool();
239: }
1.57 paf 240: if(valid_options!=options->count())
1.49 paf 241: throw Exception("parser.runtime",
1.57 paf 242: 0,
1.49 paf 243: "called with invalid option");
1.33 paf 244: } else
1.36 paf 245: throw Exception("parser.runtime",
1.57 paf 246: 0,
1.33 paf 247: "options must be hash");
1.2 parser 248: }
249:
1.57 paf 250: Temp_lang temp_lang(r, String::L_SQL);
1.37 paf 251: const String& statement_string=r.process_to_string(statement);
1.57 paf 252: const char* statement_cstr=
253: statement_string.cstr(String::L_UNSPECIFIED, r.connection());
254: HashStringValue& hash=GET_SELF(r, VHash).hash();
1.11 parser 255: hash.clear();
1.57 paf 256: Hash_sql_event_handlers handlers(
1.49 paf 257: statement_string, statement_cstr,
258: distinct,
259: hash);
1.57 paf 260: r.connection()->query(
1.23 parser 261: statement_cstr, offset, limit,
1.45 paf 262: handlers,
263: statement_string);
1.2 parser 264: }
265:
1.57 paf 266: static void keys_collector(
267: HashStringValue::key_type key,
1.61 paf 268: HashStringValue::value_type,
1.57 paf 269: Table *table) {
270: Table::element_type row(new ArrayString);
271: *row+=new String(key, String::L_TAINTED);
272: *table+=row;
1.9 parser 273: }
1.68 ! paf 274: static void _keys(Request& r, MethodParams& params) {
! 275: const String* keys_column_name;
! 276: if(params.count()>0)
! 277: keys_column_name=¶ms.as_string(0, "column name must be string");
! 278: else
! 279: keys_column_name=new String("key");
! 280:
1.57 paf 281: Table::columns_type columns(new ArrayString);
1.68 ! paf 282: *columns+=keys_column_name;
1.57 paf 283: Table* table=new Table(columns);
1.9 parser 284:
1.57 paf 285: GET_SELF(r, VHash).hash().for_each(keys_collector, table);
1.9 parser 286:
1.57 paf 287: r.write_no_lang(*new VTable(table));
1.9 parser 288: }
289:
1.57 paf 290: static void _count(Request& r, MethodParams&) {
291: r.write_no_lang(*new VInt(GET_SELF(r, VHash).hash().count()));
1.16 parser 292: }
293:
1.57 paf 294: static void _delete(Request& r, MethodParams& params) {
1.25 paf 295:
1.57 paf 296: GET_SELF(r, VHash).hash().remove(params.as_string(0, "key must be string"));
1.25 paf 297: }
298:
1.26 paf 299: #ifndef DOXYGEN
1.59 paf 300: struct Foreach_info {
1.26 paf 301: Request *r;
302: const String* key_var_name;
303: const String* value_var_name;
1.57 paf 304: Value* body_code;
305: Value* delim_maybe_code;
1.26 paf 306:
1.57 paf 307: VString* vkey;
1.26 paf 308: bool need_delim;
309: };
310: #endif
1.57 paf 311: static void one_foreach_cycle(
312: HashStringValue::key_type akey,
313: HashStringValue::value_type avalue,
1.59 paf 314: Foreach_info *info) {
1.57 paf 315: info->vkey->set_string(*new String(akey, String::L_TAINTED));
316: Value& ncontext=*info->r->get_method_frame()->caller();
317: ncontext.put_element(*info->key_var_name, info->vkey, false);
318: ncontext.put_element(*info->value_var_name, avalue, false);
319:
320: StringOrValue sv_processed=info->r->process(*info->body_code);
321: const String* s_processed=sv_processed.get_string();
322: if(info->delim_maybe_code && s_processed && s_processed->length()) { // delimiter set and we have body
323: if(info->need_delim) // need delim & iteration produced string?
324: info->r->write_pass_lang(info->r->process(*info->delim_maybe_code));
325: info->need_delim=true;
1.26 paf 326: }
1.57 paf 327: info->r->write_pass_lang(sv_processed);
1.26 paf 328: }
1.57 paf 329: static void _foreach(Request& r, MethodParams& params) {
1.63 paf 330: Foreach_info info={
331: &r,
332: ¶ms.as_string(0, "key-var name must be string"),
333: ¶ms.as_string(1, "value-var name must be string"),
334: ¶ms.as_junction(2, "body must be code"),
335: params.count()>3?params.get(3):0,
1.64 paf 336: /*vkey=*/new VString,
1.63 paf 337: false
338: };
1.57 paf 339:
340: VHash& self=GET_SELF(r, VHash);
341: HashStringValue& hash=self.hash();
1.28 paf 342: VHash_lock lock(self);
343: hash.for_each(one_foreach_cycle, &info);
1.26 paf 344: }
345:
1.1 paf 346: // constructor
347:
1.57 paf 348: MHash::MHash(): Methoded("hash")
1.39 paf 349: {
1.21 parser 350: // ^hash::create[[copy_from]]
1.57 paf 351: add_native_method("create", Method::CT_DYNAMIC, _create_or_add, 0, 1);
1.22 parser 352: // ^hash.add[add_from]
1.57 paf 353: add_native_method("add", Method::CT_DYNAMIC, _create_or_add, 1, 1);
1.22 parser 354: // ^hash.sub[sub_from]
355: add_native_method("sub", Method::CT_DYNAMIC, _sub, 1, 1);
356: // ^a.union[b] = hash
357: add_native_method("union", Method::CT_DYNAMIC, _union, 1, 1);
358: // ^a.intersection[b] = hash
359: add_native_method("intersection", Method::CT_DYNAMIC, _intersection, 1, 1);
360: // ^a.intersects[b] = bool
361: add_native_method("intersects", Method::CT_DYNAMIC, _intersects, 1, 1);
1.25 paf 362:
363: // ^a.delete[key]
364: add_native_method("delete", Method::CT_DYNAMIC, _delete, 1, 1);
1.2 parser 365:
1.33 paf 366: // ^hash:sql[query][$.limit(1) $.offset(2)]
367: add_native_method("sql", Method::CT_DYNAMIC, _sql, 1, 2);
1.2 parser 368:
1.68 ! paf 369: // ^hash._keys[[column name]]
! 370: add_native_method("_keys", Method::CT_DYNAMIC, _keys, 0, 1);
1.16 parser 371:
372: // ^hash._count[]
373: add_native_method("_count", Method::CT_DYNAMIC, _count, 0, 0);
1.26 paf 374:
375: // ^hash.foreach[key;value]{code}[delim]
376: add_native_method("foreach", Method::CT_DYNAMIC, _foreach, 2+1, 2+1+1);
1.1 paf 377: }
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