Annotation of parser3/src/types/pa_vmethod_frame.h, revision 1.57
1.3 paf 1: /** @file
1.5 paf 2: Parser: @b method_frame write context
1.3 paf 3:
1.49 paf 4: Copyright (c) 2001-2004 ArtLebedev Group (http://www.artlebedev.com)
1.22 paf 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.1 paf 6: */
7:
8: #ifndef PA_VMETHOD_FRAME_H
9: #define PA_VMETHOD_FRAME_H
1.28 paf 10:
1.57 ! paf 11: static const char * const IDENT_VMETHOD_FRAME_H="$Date: 2005/08/09 07:37:12 $";
1.1 paf 12:
13: #include "pa_wcontext.h"
1.12 parser 14: #include "pa_vvoid.h"
1.1 paf 15: #include "pa_vjunction.h"
16:
1.40 paf 17: // defines
18:
1.42 paf 19: #define CALLER_ELEMENT_NAME "caller"
20: #define SELF_ELEMENT_NAME "self"
1.50 paf 21: #define RESULT_VAR_NAME "result"
1.40 paf 22:
1.46 paf 23: // forwards
24:
25: class Request;
26:
27: /**
28: @b method parameters passed in this array.
29: contains handy typecast ad junction/not junction ensurers
30:
31: */
32: class MethodParams: public Array<Value*> {
33: public:
34: Value& operator[] (size_t index) { return *get(index); }
35:
36: Value& last() { return *get(count()-1); }
37:
38: /// handy is-value-a-junction ensurer
39: Value& as_junction(int index, const char* msg) {
1.56 paf 40: Value* value=get(index);
41: return as_junction(value, msg, index);
42: }
43: /// handy is-value-a-junction ensurer
44: Value& as_junction(Value* value, const char* msg, int index) {
45: return get_as(value, true, msg, index);
1.46 paf 46: }
47: /// handy value-is-not-a-junction ensurer
48: Value& as_no_junction(int index, const char* msg) {
1.56 paf 49: Value* value=get(index);
50: return as_no_junction(value, msg, index);
51: }
52: /// handy value-is-not-a-junction ensurer
53: Value& as_no_junction(Value* value, const char* msg, int index) {
54: return get_as(value, false, msg, index);
1.46 paf 55: }
56: /// handy expression auto-processing to double
57: double as_double(int index, const char* msg, Request& r) {
1.56 paf 58: Value* value=get(index);
1.57 ! paf 59: if(!value->is_number())
! 60: value=&get_processed(value, msg, index, r);
! 61: return value->as_double();
1.46 paf 62: }
63: /// handy expression auto-processing to int
64: int as_int(int index, const char* msg, Request& r) {
1.56 paf 65: Value* value=get(index);
1.57 ! paf 66: if(!value->is_number())
! 67: value=&get_processed(value, msg, index, r);
! 68: return value->as_int();
1.46 paf 69: }
70: /// handy expression auto-processing to bool
71: bool as_bool(int index, const char* msg, Request& r) {
1.56 paf 72: Value* value=get(index);
73: return get_processed(value, msg, index, r).as_bool();
1.46 paf 74: }
75: /// handy string ensurer
76: const String& as_string(int index, const char* msg) {
77: return as_no_junction(index, msg).as_string();
78: }
79:
80: private:
81:
82: /// handy value-is/not-a-junction ensurer
1.56 paf 83: Value& get_as(Value* value, bool as_junction, const char* msg, int index) {
84: if((value->get_junction()!=0) ^ as_junction)
1.46 paf 85: throw Exception("parser.runtime",
86: 0,
87: "%s (parameter #%d)", msg, 1+index);
88:
1.56 paf 89: return *value;
1.46 paf 90: }
91:
1.56 paf 92: Value& get_processed(Value* value, const char* msg, int index, Request& r);
1.46 paf 93:
94: };
95:
1.4 paf 96: /** Method frame write context
97: accepts values written by method code
98: also handles method parameters and local variables
1.3 paf 99: */
1.46 paf 100: class VMethodFrame: public WContext {
101: VMethodFrame *fcaller;
102:
103: size_t store_param_index;
104: HashStringValue* my;/*OR*/MethodParams* fnumbered_params;
105: Value* fself;
106:
107: Value* fresult_initial_void;
108:
1.1 paf 109: public: // Value
110:
1.46 paf 111: override const char* type() const { return "method_frame"; }
1.20 paf 112:
113: /// VMethodFrame: $result | parent get_string(=accumulated fstring)
1.46 paf 114: override const String* get_string() {
1.20 paf 115: // check the $result value
1.46 paf 116: Value* result=get_result_variable();
1.20 paf 117: // if we have one, return it's string value, else return as usual: accumulated fstring or fvalue
118: return result ? result->get_string() : WContext::get_string();
119: }
120:
1.40 paf 121: /// VMethodFrame: my or self_transparent or $caller
1.51 paf 122: override Value* get_element(const String& aname, Value& /*aself*/, bool looking_up) {
1.46 paf 123: if(my) {
124: if(Value* result=my->get(aname))
1.1 paf 125: return result;
126: }
1.51 paf 127: if(Value* result=self().get_element(aname, self(), looking_up))
1.40 paf 128: return result;
129:
1.42 paf 130: if(aname==CALLER_ELEMENT_NAME)
1.40 paf 131: return caller();
1.42 paf 132:
133: if(aname==SELF_ELEMENT_NAME)
134: return &self();
1.40 paf 135:
136: return 0;
1.1 paf 137: }
1.4 paf 138: /// VMethodFrame: my or self_transparent
1.55 paf 139: override const VJunction* put_element(Value& /*aself*/, const String& aname, Value* avalue, bool /*areplace*/) {
1.53 paf 140: if(my && my->put_replaced(aname, avalue))
1.52 paf 141: return PUT_ELEMENT_REPLACED_ELEMENT;
1.32 paf 142:
1.54 paf 143: return self().put_element(self(), aname, avalue, false/*=always, areplace*/);
1.1 paf 144: }
145:
1.4 paf 146: /// VMethodFrame: self_transparent
1.46 paf 147: override VStateless_class* get_class() { return self().get_class(); }
1.44 paf 148:
149: /// VMethodFrame: self_transparent
1.46 paf 150: override Value* base() { return self().base(); }
1.1 paf 151:
1.30 paf 152: public: // WContext
1.1 paf 153:
1.46 paf 154: override StringOrValue result() {
1.1 paf 155: // check the $result value
1.46 paf 156: Value* result_value=get_result_variable();
1.1 paf 157: // if we have one, return it, else return as usual: accumulated fstring or fvalue
1.52 paf 158: return result_value ? StringOrValue(*result_value) : WContext::result();
1.1 paf 159: }
160:
1.46 paf 161: void write(Value& avalue, String::Language alang) {
162: WContext::write(avalue, alang);
163: }
164:
1.1 paf 165: public: // usage
166:
1.46 paf 167: VMethodFrame(
1.40 paf 168: const Junction& ajunction/*info: always method-junction*/,
1.46 paf 169: VMethodFrame *acaller);
1.1 paf 170:
1.40 paf 171: VMethodFrame *caller() { return fcaller; }
1.25 paf 172:
1.38 paf 173: void set_self(Value& aself) { fself=&aself; }
1.41 paf 174: /// we sure that someone already set our self with VMethodFrame::set_self(Value&)
175: Value& self() { return *fself; }
1.1 paf 176:
1.27 paf 177: bool can_store_param() {
178: const Method& method=*junction.method;
1.46 paf 179: return method.params_names && store_param_index<method.params_names->count();
1.27 paf 180: }
1.46 paf 181: void store_param(Value& value) {
1.1 paf 182: const Method& method=*junction.method;
1.46 paf 183: size_t max_params=
1.1 paf 184: method.max_numbered_params_count?method.max_numbered_params_count:
1.46 paf 185: method.params_names?method.params_names->count():
1.1 paf 186: 0;
187: if(store_param_index==max_params)
1.23 paf 188: throw Exception("parser.runtime",
1.46 paf 189: 0, //&name(),
1.7 paf 190: "method of %s (%s) accepts maximum %d parameter(s)",
1.38 paf 191: junction.self.get_class()->name_cstr(),
192: junction.self.type(),
1.1 paf 193: max_params);
194:
1.46 paf 195: if(fnumbered_params) { // are this method params numbered?
196: *fnumbered_params+=&value;
1.1 paf 197: } else { // named param
1.25 paf 198: // speedup: not checking for clash with "result" fname
1.46 paf 199: const String& fname=*(*method.params_names)[store_param_index];
1.25 paf 200: set_my_variable(fname, value);
1.1 paf 201: }
202: store_param_index++;
203: }
204: void fill_unspecified_params() {
205: const Method &method=*junction.method;
1.46 paf 206: if(method.params_names) { // there are any named parameters might need filling?
207: size_t param_count=method.params_names->count();
208: for(; store_param_index<param_count; store_param_index++) {
209: const String& fname=*(*method.params_names)[store_param_index];
210: my->put(fname, new VVoid);
1.1 paf 211: }
1.46 paf 212: }
1.1 paf 213: }
214:
1.46 paf 215: MethodParams* numbered_params() { return fnumbered_params; }
1.18 paf 216:
217: private:
218:
1.46 paf 219: void set_my_variable(const String& fname, Value& value) {
220: my->put(fname, &value); // remember param
1.25 paf 221: }
222:
1.46 paf 223: Value* get_result_variable();
1.1 paf 224:
225: public:
226:
227: const Junction& junction;
228:
1.41 paf 229: };
230:
231: /// Auto-object used for temporary changing VMethod_frame::fself.
232: class Temp_method_frame_self {
233: VMethodFrame& fmethod_frame;
1.46 paf 234: Value* saved_self;
1.41 paf 235: public:
236: Temp_method_frame_self(VMethodFrame& amethod_frame, Value& aself) :
237: fmethod_frame(amethod_frame),
1.46 paf 238: saved_self(&amethod_frame.self()) {
1.41 paf 239: fmethod_frame.set_self(aself);
240: }
241: ~Temp_method_frame_self() {
1.46 paf 242: fmethod_frame.set_self(*saved_self);
1.41 paf 243: }
1.1 paf 244: };
245:
246: #endif
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