Annotation of parser3/src/types/pa_vmethod_frame.h, revision 1.51.6.4
1.3 paf 1: /** @file
1.5 paf 2: Parser: @b method_frame write context
1.3 paf 3:
1.51.6.1 paf 4: Copyright (c) 2001-2005 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:
1.51.6.4! paf 11: static const char * const IDENT_VMETHOD_FRAME_H="$Date: 2005/08/09 08:12:50 $";
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) {
1.51.6.2 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) {
1.51.6.2 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) {
1.51.6.2 paf 58: Value* value=get(index);
1.51.6.3 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) {
1.51.6.2 paf 65: Value* value=get(index);
1.51.6.3 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) {
1.51.6.2 paf 72: Value* value=get(index);
1.51.6.4! paf 73: if(!value->is_number())
! 74: value=&get_processed(value, msg, index, r);
! 75: return value->as_bool();
1.46 paf 76: }
77: /// handy string ensurer
78: const String& as_string(int index, const char* msg) {
79: return as_no_junction(index, msg).as_string();
80: }
81:
82: private:
83:
84: /// handy value-is/not-a-junction ensurer
1.51.6.2 paf 85: Value& get_as(Value* value, bool as_junction, const char* msg, int index) {
86: if((value->get_junction()!=0) ^ as_junction)
1.46 paf 87: throw Exception("parser.runtime",
88: 0,
89: "%s (parameter #%d)", msg, 1+index);
90:
1.51.6.2 paf 91: return *value;
1.46 paf 92: }
93:
1.51.6.2 paf 94: Value& get_processed(Value* value, const char* msg, int index, Request& r);
1.46 paf 95:
96: };
97:
1.4 paf 98: /** Method frame write context
99: accepts values written by method code
100: also handles method parameters and local variables
1.3 paf 101: */
1.46 paf 102: class VMethodFrame: public WContext {
103: VMethodFrame *fcaller;
104:
105: size_t store_param_index;
106: HashStringValue* my;/*OR*/MethodParams* fnumbered_params;
107: Value* fself;
108:
109: Value* fresult_initial_void;
110:
1.1 paf 111: public: // Value
112:
1.46 paf 113: override const char* type() const { return "method_frame"; }
1.20 paf 114:
115: /// VMethodFrame: $result | parent get_string(=accumulated fstring)
1.46 paf 116: override const String* get_string() {
1.20 paf 117: // check the $result value
1.46 paf 118: Value* result=get_result_variable();
1.20 paf 119: // if we have one, return it's string value, else return as usual: accumulated fstring or fvalue
120: return result ? result->get_string() : WContext::get_string();
121: }
122:
1.40 paf 123: /// VMethodFrame: my or self_transparent or $caller
1.51 paf 124: override Value* get_element(const String& aname, Value& /*aself*/, bool looking_up) {
1.46 paf 125: if(my) {
126: if(Value* result=my->get(aname))
1.1 paf 127: return result;
128: }
1.51 paf 129: if(Value* result=self().get_element(aname, self(), looking_up))
1.40 paf 130: return result;
131:
1.42 paf 132: if(aname==CALLER_ELEMENT_NAME)
1.40 paf 133: return caller();
1.42 paf 134:
135: if(aname==SELF_ELEMENT_NAME)
136: return &self();
1.40 paf 137:
138: return 0;
1.1 paf 139: }
1.4 paf 140: /// VMethodFrame: my or self_transparent
1.46 paf 141: override bool put_element(const String& aname, Value* avalue, bool replace) {
142: if(my && my->put_replace(aname, avalue))
1.32 paf 143: return true;
144:
1.41 paf 145: return self().put_element(aname, avalue, replace);
1.1 paf 146: }
147:
1.4 paf 148: /// VMethodFrame: self_transparent
1.46 paf 149: override VStateless_class* get_class() { return self().get_class(); }
1.44 paf 150:
151: /// VMethodFrame: self_transparent
1.46 paf 152: override Value* base() { return self().base(); }
1.1 paf 153:
1.30 paf 154: public: // WContext
1.1 paf 155:
1.46 paf 156: override StringOrValue result() {
1.1 paf 157: // check the $result value
1.46 paf 158: Value* result_value=get_result_variable();
1.1 paf 159: // if we have one, return it, else return as usual: accumulated fstring or fvalue
1.24 paf 160: return result_value ? StringOrValue(0, result_value) : WContext::result();
1.1 paf 161: }
162:
1.46 paf 163: void write(Value& avalue, String::Language alang) {
164: WContext::write(avalue, alang);
165: }
166:
1.1 paf 167: public: // usage
168:
1.46 paf 169: VMethodFrame(
1.40 paf 170: const Junction& ajunction/*info: always method-junction*/,
1.46 paf 171: VMethodFrame *acaller);
1.1 paf 172:
1.40 paf 173: VMethodFrame *caller() { return fcaller; }
1.25 paf 174:
1.38 paf 175: void set_self(Value& aself) { fself=&aself; }
1.41 paf 176: /// we sure that someone already set our self with VMethodFrame::set_self(Value&)
177: Value& self() { return *fself; }
1.1 paf 178:
1.27 paf 179: bool can_store_param() {
180: const Method& method=*junction.method;
1.46 paf 181: return method.params_names && store_param_index<method.params_names->count();
1.27 paf 182: }
1.46 paf 183: void store_param(Value& value) {
1.1 paf 184: const Method& method=*junction.method;
1.46 paf 185: size_t max_params=
1.1 paf 186: method.max_numbered_params_count?method.max_numbered_params_count:
1.46 paf 187: method.params_names?method.params_names->count():
1.1 paf 188: 0;
189: if(store_param_index==max_params)
1.23 paf 190: throw Exception("parser.runtime",
1.46 paf 191: 0, //&name(),
1.7 paf 192: "method of %s (%s) accepts maximum %d parameter(s)",
1.38 paf 193: junction.self.get_class()->name_cstr(),
194: junction.self.type(),
1.1 paf 195: max_params);
196:
1.46 paf 197: if(fnumbered_params) { // are this method params numbered?
198: *fnumbered_params+=&value;
1.1 paf 199: } else { // named param
1.25 paf 200: // speedup: not checking for clash with "result" fname
1.46 paf 201: const String& fname=*(*method.params_names)[store_param_index];
1.25 paf 202: set_my_variable(fname, value);
1.1 paf 203: }
204: store_param_index++;
205: }
206: void fill_unspecified_params() {
207: const Method &method=*junction.method;
1.46 paf 208: if(method.params_names) { // there are any named parameters might need filling?
209: size_t param_count=method.params_names->count();
210: for(; store_param_index<param_count; store_param_index++) {
211: const String& fname=*(*method.params_names)[store_param_index];
212: my->put(fname, new VVoid);
1.1 paf 213: }
1.46 paf 214: }
1.1 paf 215: }
216:
1.46 paf 217: MethodParams* numbered_params() { return fnumbered_params; }
1.18 paf 218:
219: private:
220:
1.46 paf 221: void set_my_variable(const String& fname, Value& value) {
222: my->put(fname, &value); // remember param
1.25 paf 223: }
224:
1.46 paf 225: Value* get_result_variable();
1.1 paf 226:
227: public:
228:
229: const Junction& junction;
230:
1.41 paf 231: };
232:
233: /// Auto-object used for temporary changing VMethod_frame::fself.
234: class Temp_method_frame_self {
235: VMethodFrame& fmethod_frame;
1.46 paf 236: Value* saved_self;
1.41 paf 237: public:
238: Temp_method_frame_self(VMethodFrame& amethod_frame, Value& aself) :
239: fmethod_frame(amethod_frame),
1.46 paf 240: saved_self(&amethod_frame.self()) {
1.41 paf 241: fmethod_frame.set_self(aself);
242: }
243: ~Temp_method_frame_self() {
1.46 paf 244: fmethod_frame.set_self(*saved_self);
1.41 paf 245: }
1.1 paf 246: };
247:
248: #endif
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